UNIT CORP (Form: 8-K, Received: 09/15/2011 17:07:53)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 13, 2011

Unit Corporation

(Exact name of registrant as specified in its charter)

	Delaware	1-9260	73-1283193
	(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

7130 South Lewis, Suite 1000, Tulsa, Oklahoma	74136
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (918) 493-7700

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

___	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
___	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
___	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act

(17 CFR 240.14d-2(b))

___	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act

(17 CFR 240.13e-4(c))

Item 1.01 Entry into a Material Definitive Agreement .

On September 13, 2011, Unit Corporation, including certain of its subsidiaries (collectively the "Company"), entered into a Senior Credit Agreement (“Agreement”) with, among others, BOKF, NA (formerly Bank of Oklahoma, NA), Compass Bank, Bank of America, N.A., and Bank of Montreal. BOKF, NA is administrative agent for the lenders in the Agreement and also a joint lead arranger, joint bookrunner, and co-syndication agent. Compass Bank is the other joint lead arranger, joint bookrunner, and co-syndication agent. Bank of America, N.A. and Bank of Montreal are co-documentation agents.

The Agreement replaces the company's previous credit agreement, entered into between the Company and certain lenders on May 24, 2007, as subsequently amended ("Previous Credit Agreement"). The Agreement provides for, among other things, an initial Total Commitment of $250,000,000 and an initial Maximum Credit Amount of $750,000,000. Subject to future redetermination as provided in the Agreement, the initial Borrowing Base is set at $537,500,000.

The proceeds from the Agreement will be used to (i) refinance in full any existing indebtedness and extinguish the commitments issued under the Previous Credit Agreement, and (ii) provide financing for general working capital requirements for (a) exploration, development, production and acquisition of Oil and Gas Properties, (b) acquisitions and operation of midstream assets, (c) issuance of standby Letters of Credit, (d) contract drilling services, and (e) general corporate purposes of the Borrowers.

The Agreement will terminate in five (5) years or any earlier date on which the Total Commitment is reduced to zero or otherwise terminated under its terms.

The above description of the Agreement does not purport to be complete and is qualified in its entirety by reference to the attached copy of the Agreement, which is incorporated by reference into this item 1.01. Capitalized terms used and not otherwise defined herein have the meanings given them in the Agreement.

Section 9 - Financial Statements and Exhibits.

Item 9.01 Financial Statements and Exhibits.

(a) Financial Statements of Businesses Acquired.

Not Applicable.

(b) Pro Forma Financial Information.

Not Applicable.

	10.1	Senior Credit Agreement dated September 13, 2011

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	Unit Corporation


Date: September 15, 2011	By:	/s/ Mark E. Schell
		Mark E. Schell Senior Vice President and General Counsel

SENIOR CREDIT AGREEMENT

DATED AS OF SEPTEMBER 13, 2011

AMONG

UNIT CORPORATION,

SUPERIOR PIPELINE COMPANY, L.L.C.,

UNIT DRILLING COMPANY,

UNIT PETROLEUM COMPANY,

SUPERIOR PIPELINE TEXAS, L.L.C.,

SUPERIOR APPALACHIAN PIPELINE, L.L.C

and

UNIT TEXAS DRILLING, L.L.C.,

AS BORROWERS,

and

THE LENDERS,

BOKF, NA, DBA BANK OF OKLAHOMA,

AS ADMINISTRATIVE AGENT FOR THE LENDERS,

and with

COMPASS BANK

JOINT-LEAD ARRANGERS, JOINT BOOKRUNNERS AND CO-SYNDICATION AGENTS,

and with

BANK OF AMERICA, N.A. AND BANK OF MONTREAL,

CO-DOCUMENTATION AGENTS

	TABLE OF CONTENTS

ARTICLE 1 DEFINITIONS			4
	1.1	Defined Terms.	4
	1.2	Exhibits and Schedules; Additional Definitions.	19
	1.3	Reference and Titles.	19
	1.4	Accounting Terms and Determinations.	19
	1.5	Calculations and Determinations.	19
	1.6	Joint Preparation; Construction of Indemnities and Releases	20

ARTICLE 2 THE CREDITS			20
	2.1	Commitments; Initial Total Commitment; Maximum Credit Amount.	20
	2.2	Minimum Amount of Each Advance	20
	2.3	Ratable Loan.	20
	2.4	Types of Advances.	20
	2.5	Facility Fee; Commitment Fee; Late Fees; Agency and Other Fees.	20
	2.6	Borrowing Base.	21
	2.7	Repayment of Loans; Evidence of Loans	24
	2.8	Principal Payments; Termination and Reduction of Commitment.	25
	2.9	Method of Selecting Loan Types and Interest Periods for New Advances	26
	2.10	Conversion and Continuation of Outstanding Advances	27
	2.11	Interest Rate	27
	2.12	Effect of Default or Deficiency on Advances/Rates
		Applicable After Default or Deficiency	28
	2.13	Method of Payment of Obligations.	28
	2.14	Payment of Fees	29
	2.15	Telephonic Notices.	29
	2.16	Payment Date.	29
	2.17	Notification of Advances, Interest Rates, and LC Requests.	29
	2.18	Non-Receipt of Funds by the Administrative Agent.	29
	2.19	Letters of Credit.	30
	2.20	Defaulting Lenders	33
	2.21	Ratable Payments.	35

ARTICLE 3 YIELD PROTECTION; TAXES			35
	3.1	Yield Protection	35
	3.2	Changes in Capital Adequacy Regulations	36
	3.3	Taxes. (i)	37
	3.4	Availability of Eurodollar Advances	38
	3.5	Funding Indemnification	39
	3.6	Mitigation Obligations.	39
	3.7	Replacement Lenders	39
	3.8	Extension of Maturity Date.	40


ARTICLE 4 CONDITIONS PRECEDENT			42
	4.1	Credit Extension.	42
	4.2	Each Credit Extension.	43

ARTICLE 5 REPRESENTATIONS AND WARRANTIES			44
	5.1	Existence and Good Standing.	44
	5.2	Authorization and Validity.	44
	5.3	No Conflict; Government Consent.	44
	5.4	Financial Statements.	45
	5.5	Material Adverse Effect.	45
	5.6	Taxes.	45
	5.7	Litigation and Contingent Obligations.	45
	5.8	Subsidiaries.	45
	5.9	ERISA.	46
	5.10	Accuracy of Information.	46
	5.11	Margin Stock.	46
	5.12	Material Agreements; Default.	46
	5.13	Compliance With Laws.	46
	5.14	Ownership of Properties.	47
	5.15	Plan Assets; Prohibited Transactions	47
	5.16	Environmental Matters.	47
	5.17	Names and Places of Business.	49
	5.18	Possession of Franchises, Licenses.	49
	5.19	Rate Management Transactions.	49
	5.20	Insurance.	49
	5.21	Solvency	49

ARTICLE 6 AFFIRMATIVE COVENANTS			50
	6.1	Reports	50
	6.2	Use of Proceeds.	52
	6.3	Notice of Default.	52
	6.4	Conduct of Business.	52
	6.5	Taxes.	52
	6.6	Insurance.	52
	6.7	Compliance With Laws.	52
	6.8	Maintenance of Properties.	52
	6.9	Inspection.	53

ARTICLE 7 NEGATIVE COVENANTS			53
	7.1	Dividends	53
	7.2	Indebtedness	53
	7.3	Limitation on Fundamental Changes	55
	7.4	Sale of Property	55
	7.5	Investments and Acquisitions	56
	7.6	Liens	57
	7.7	Affiliates	58
	7.8	Contingent Obligations	59
	7.9	Financial Contracts	59

	7.10	Letters of Credit	60
	7.11	Prohibited Contracts	60
	7.12	Negative Pledge	61
	7.13	Redemption of Existing Subordinated Notes; Amendment
		of Existing Subordinated Notes Indenture	61

ARTICLE 8 FINANCIAL COVENANTS			62
	8.1	Current Ratio	62
	8.2	Leverage Ratio	62

ARTICLE 9 GUARANTEES			62
	9.1	Guarantees	62
	9.2	Releases of Guarantees	62
	9.3	Production Proceeds.	63

ARTICLE 10 EVENTS OF DEFAULTS			63
	10.1	Events of Default.	63

ARTICLE 11 ACCELERATION, WAIVERS, AMENDMENTS AND REMEDIES			65
	11.1	Acceleration.	65
	11.2	Amendments	66
	11.3	Preservation of Rights	67
	11.4	Allocation of Payments After Event of Default	67

ARTICLE 12 GENERAL PROVISIONS			68
	12.1	Survival of Agreements.	68
	12.2	Governmental Regulation.	68
	12.3	Headings.	68
	12.4	Entire Agreement.	68
	12.5	Several Obligations; Benefits of this Agreement	68
	12.6	Expenses; Indemnification	68
	12.7	Severability of Provisions.	69
	12.8	Environmental Indemnities.	69
	12.9	Nonliability of Lenders.	71
	12.10	No Advisory or Fiduciary Responsibility.	71
	12.11	Confidentiality.	72
	12.12	Disclosure.	72
	12.13	Place of Payment.	72
	12.14	Interest	72
	12.15	Automatic Debit of Borrowers’ Operating Account.	73
	12.16	Exceptions to Covenants.	74
	12.17	Conflict with Other Loan Documents.	74
	12.18	Lost Documents.	74
	12.19	Setoff.	74

ARTICLE 13 THE ADMINISTRATIVE AGENT			74
	13.1	Appointment; Nature of Relationship.	74

iii

	13.2	Powers.	75
	13.3	General Immunity.	75
	13.4	No Responsibility for Loans, Recitals.	75
	13.5	Action on Instructions of Lenders.	76
	13.6	Employment of Administrative Agents; Counsel; Reliance.	76
	13.7	Administrative Agent’s Reimbursement and Indemnification.	76
	13.8	Notice of Default.	77
	13.9	Rights as a Lender.	77
	13.10	Lender Credit Decision.	77
	13.11	Successor Administrative Agent.	77
	13.12	Syndication Agents; Other Agents; Arrangers	78
	13.13	Delegation to Affiliates.	78

ARTICLE 14 BENEFIT OF AGREEMENT; ASSIGNMENTS; PARTICIPATIONS			78
	14.1	Successors and Assigns.	78
	14.2	Participations.	79
	14.3	Assignments.	80
	14.4	Dissemination of Information	81
	14.5	Tax Treatment.	81
	14.6	Procedure for Increases and Additional Lenders.	81

ARTICLE 15 NOTICES/CONSENTS			83
	15.1	Notices.	83
	15.2	Change of Address.	83
	15.3	Consent to Amendments.	84
	15.4	USA PATRIOT Act Notice.	84
	15.5	Electronic Communications.	84

ARTICLE 16 COUNTERPARTS			84
	16.1	Counterparts.	84

ARTICLE 17 CHOICE OF LAW; CONSENT TO JURISDICTION; WAIVER OF JURY TRIAL			85
	17.1	Choice of Law.	85
	17.2	Consent to Jurisdiction.	85
	17.3	No Oral Agreements.	85
	17.4	Exculpation Provisions.	86
	17.5	Waiver Of Jury Trial, Punitive Damages, Suretyship Defenses.	86

Exhibits

Exhibit A - Form of Promissory Note

Exhibit B - Compliance Certificate

Exhibit C - Form of Assignment

Exhibit D - Increase Request Agreement

Exhibit E - Form of Subsidiary Guaranty

Schedules

Schedule 1 - Pricing Schedule

Schedule 2 - Lenders’ Schedule

Schedule 3 - Disclosure Schedule

Schedule 4 - Environmental Matters

Schedule 5 - Rate Management Transactions

Schedule 6 - Excluded Accounts

Schedule 7 - Contingent Obligations

INDEX TO DEFINED TERMS

Acquisition	4	Eurodollar Rate	9
Additional Commitment Lender	41	Event of Default	9
Administrative Agent	4	Excluded Accounts	73
Advance	4	Excluded Taxes	9
Affiliate	5	Existing Indebtedness	3
Alternate Base Rate	5	Existing Subordinated Notes	10
Applicable Margin	5	Existing Subordinated Notes Indenture	10
Authorized Officer	5	Facility Termination Date	10
Available Aggregate Commitment	5	Federal Funds Effective Rate	10
BBA LIBOR	9	Financial Contract	10
Borrowers	5	Floating Rate	11
Borrowing Base	5	Floating Rate Advance	11
Borrowing Base Properties	5	Floating Rate Loan	11
Borrowing Base Usage Percentage	5	Foreign Subsidiary	11
Borrowing Date	5	Funded Debt	11
Borrowing Notice	27	GAAP	11
Business	48	Governmental Authority	11
Business Day	5	Highest Lawful Rate	11
Capitalized Lease	6	Hydrocarbon Interests	11
Capitalized Lease Obligations	6	Hydrocarbons	11
Cash Equivalent Investments	6	Increase Request	80
Change	36	Indebtedness	12
Change in Control	6	Indemnified Taxes	12
Code	6	Interest Period	12
Commitment	6	International Convergence of Capital
		Measurements and Capital Standards	37
Commitment Fee Rate	6	Investment	12
Consolidated EBITDA	6	LC	30
Consolidated Interest Expense	6	LC Application	31
Consolidated Net Income	7	LC Fee	31
Contingent Obligation	7	LC Issuer	13
Controlled Group	7	LC Obligations	13
Conversion/Continuation Notice	27	LC Payment Date	31
Credit Extension	7	LC Sublimit	13
Credit Extension Date	7	Lender Termination Date	40
Credit Parties	7	Lenders	13
Credit Party	7	Lenders' Schedule	13
Deficiency	24	Letter of Credit	13
Determination Date	23	Lien	13
Disclosure Schedule	8	Loan	13
Engineering Report	8	Loan Documents	13
Environmental Laws	9	Material Adverse Effect	13
ERISA	9	Material Domestic Subsidiary	13
Eurodollar Advance	9	Material Indebtedness	14
Eurodollar Base Rate	9	Material Indebtedness Agreement	14
Eurodollar Loan	9


Material Subsidiary	14	Register	80
Materials of Environmental Concern	14	Regulation D	17
Maximum Credit Amount	14	Regulation U	17
Modification	30	Reimbursement Obligations	17
Modify	30	Replacement Lenders	40
Moody's	14	Reportable Event	17
Multiemployer Plan	14	Required Lenders	17
Net Cash Proceeds	14	Reserve Requirement	17
Notice of Assignment	79	Risk-Based Capital Guidelines	36
Notice of Termination	39	S&P	17
Obligations	14	Scheduled Redetermination	17
Oil and Gas Properties	14	SEC	17
Other Taxes	15	Single Employer Plan	17
Outstanding Credit Exposure	15	Special Redetermination	17
Participants	78	Subsidiary	17
Payment Date	15	Subsidiary Guarantor	18
PBGC	15	Subsidiary Guaranty	18
Permitted Encumbrances	15	Subsidiary Guaranty Joinder Agreement	18
Person	15	Superior Cash Flow	18
Plan	16	Taxes	18
Pricing Schedule	16	Terminated Lender	39
Prime Rate	16	Total Commitment	18
Pro Rata Share	16	Total Outstanding Credit Exposure	18
Property	16	Transferee	80
Purchasers	79	Unfunded Liabilities	18
Rate Management Obligations	16	Wholly-Owned Subsidiary	18
Rate Management Transaction	16	Withdrawal Liability	19

SENIOR CREDIT AGREEMENT

THIS SENIOR CREDIT AGREEMENT (“ Agreement” is effective as of September 13, 2011. It is between:

UNIT CORPORATION, a Delaware corporation (“ Unit ”), SUPERIOR PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma corporation, SUPERIOR PIPELINE TEXAS, L.L.C., an Oklahoma limited liability company, SUPERIOR APPALACHIAN PIPELINE, L.L.C., an Oklahoma limited liability company, and UNIT TEXAS DRILLING, L.L.C., an Oklahoma limited liability company, each with its principal place of business at 7130 South Lewis, Suite 1000, Tulsa, Oklahoma 74136 (individually a “Borrower” and collectively the “ Borrowers ”),

and

BOKF, NA, dba Bank of Oklahoma, formerly Bank of Oklahoma, National Association (“ BOk ”), COMPASS BANK (“ BBVA Compass ”), BOk and BBVA Compass as joint lead arrangers, joint bookrunners and co-syndication agents (“ Syndication Agents ”), BANK OF AMERICA, N.A. (“ B of A ”),and BANK OF MONTREAL (“ BMO ”), as co-documentation agents (“Documentation Agents”), the lenders now or at various times later signatories to this Agreement (the current lender parties to this Agreement and the Additional Lenders that may become signatory parties to this Agreement, each being sometimes referred to in this Agreement, individually, as a “ Lender ,” and collectively as the “ Lenders ”);

and

BOk as administrative agent for the Lenders(in that capacity, referred to as the “ Administrative Agent ”).

RECITALS

The Borrowers (but not SUPERIOR PIPELINE TEXAS, L.L.C., an Oklahoma limited liability company and SUPERIOR APPALACHIAN PIPELINE, L.L.C., an Oklahoma limited liability company), BOk, as the administrative agent for the financial institutions defined in that agreement as the “Existing Lenders” are parties to a First Amended and Restated Credit Agreement dated as of May 24, 2007, as amended by the First Amendment dated as of December 23, 2008 (collectively, the “ Existing Credit Agreement ”). The Existing Lenders provided certain loans and extensions of revolving credit to the Borrowers (all indebtedness arising and all obligations, including contingent liabilities on letters of credit issued under the Existing Credit Agreement are collectively called the “ Existing Indebtedness “);

Unit has requested the Joint-Lead Arrangers to (i) arrange for the refinancing of any Existing Indebtedness and the commitments issued in the Existing Credit Agreement, (ii) provide financing for general working capital requirements for (a) exploration, development, production and acquisition of Oil and Gas Properties, (b) acquisitions and operation of midstream assets, (c) issuance of standby Letters of Credit, (d) contract drilling services, and (e) general corporate purposes of the Borrowers, and (iii) otherwise amend some of the terms of the Existing Credit Agreement. Borrowers have agreed to refinance any Existing Indebtedness in full with funds to be made available under this Agreement;

C.	The Lenders desire to appoint BOk as Administrative Agent for the Lenders, and Borrowers desire to obtain the Commitments (i) to refinance any Existing Indebtedness, and (ii) for the other purposes permitted by the terms of this Agreement;

After giving effect to the refinancing of any Existing Indebtedness and extinguishing and replacing the commitments of the Existing Lenders with the Commitments, the several (but not joint) Commitment of each Lender will be as set forth on the Lenders’ Schedule annexed to this Agreement as Schedule 2; and

E.	By a separate agreement between BOk and Borrowers, BOk and BBVA Compass were appointed Joint-Lead Arrangers, Joint Bookrunners and Co-Syndication Agents, and B of A and BMO have been appointed Documentation Agents for this Agreement.

NOW, THEREFORE, the parties agree as follows:

ARTICLE 1

DEFINITIONS

1.1 Defined Terms . The following terms have the meaning specified below:

“ Acquisition ” means any transaction, or any series of related transactions, consummated on or after the date of this Agreement, by which any of the Credit Parties (i) acquires, by any means, any going business or all or substantially all of the assets of any Person, (ii) directly or indirectly acquires (in one transaction or as the most recent transaction in a series of transactions) at least a majority (in number of votes) of the securities of a corporation which have ordinary voting power for the election of directors (other than securities having power only by reason of the happening of a contingency) or a majority (by percentage or voting power) of the outstanding ownership interests of a partnership or limited liability company, or (iii) acquires individually or together Oil and Gas Properties (and ancillary assets), gas gathering systems or gas processing plants, or drilling rigs (and ancillary equipment).

“ Administrative Agent ” means BOk in its capacity as contractual administrative agent of the Lenders.

“ Advance ” means a borrowing under Article 2, (i) made by the Lenders on the same Borrowing Date, or (ii) converted or continued by the Lenders on the same date of conversion or continuation, consisting, in either case, of Loans of the same type (either Floating Rate Advance or Eurodollar Advance) and, in the case of Eurodollar Loans, for the same Interest Period.

“ Affiliate ” of any Person means any other Person directly or indirectly controlling, controlled by or under common control with that Person. A Person will be deemed to control another Person if the controlling Person owns 10% or more of any class of voting securities (capital stock, general or limited partnership units or interests, limited liability company membership interests or association or other business entity shares, participations, rights or other equivalent ownership interests, however designated) of the controlled Person or possesses, directly or indirectly, the power to direct or cause the direction of the management or policies of the controlled Person, whether through ownership of stock, by contract or otherwise.

“ Alternate Base Rate ” means, for any day, a rate of interest per annum equal to the higher of (i) the Prime Rate for that day, or (ii) the sum of the Federal Funds Effective Rate for that day plus one-half of one percent (0.50%); but, in no event shall the Alternate Base Rate be less than the sum of (x) the Eurodollar Rate for that day for a Eurodollar Loan with a one month Interest Period plus (y) one hundred basis points (1.00%).

“ Applicable Margin ” means the percentage rate per annum set forth in the Pricing Schedule.

“ Authorized Officer ” means the president, the chief financial officer, any vice president, the treasurer or any assistant treasurer of the Borrowers, acting singly.

“ Available Total Commitment ” means, at any time, the Total Commitment then in effect minus the Total Outstanding Credit Exposure.

“ Borrowers ” means Unit, and its existing Material Subsidiaries, and their respective successors and assigns, including any receiver, trustee or debtor-in-possession.

“ Borrowing Base ” means, at the time in question, either the amount provided for in Section 2.6.1 or the amount otherwise determined in accordance with the remaining provisions of Section 2.6.

“ Borrowing Base Properties ” means the Oil and Gas Properties and Superior Cash Flow evaluated by Lenders for purposes of establishing the Borrowing Base.

“ Borrowing Base Usage Percentage ” means, for any day, the percentage equal to the quotient of (i) the Total Outstanding Credit Exposure on that day, divided by (ii) the Borrowing Base.

“ Borrowing Date ” means the date an Advance is made under this Agreement.

“ Business Day ” means (i) with respect to any borrowing, payment or rate selection of Eurodollar Advances, a day (other than a Saturday or Sunday) on which banks generally are open in Tulsa, Oklahoma, and New York City, New York, for the conduct of substantially all of their commercial lending activities, interbank wire transfers can be made on the Fedwire system and dealings in United States dollars are carried on in the London interbank market and (ii) for all other purposes, a day (other than a Saturday or Sunday) on which banks generally are open in Tulsa, Oklahoma, for the conduct of substantially all of their commercial lending activities and interbank wire transfers can be made on the Fedwire system.

“ Capitalized Lease ” of a Person, means any lease of Property by that Person as lessee which would be capitalized on that Person’s balance sheet prepared in accordance with GAAP.

“ Capitalized Lease Obligations ” of a Person means the amount of the obligations of that Person under Capitalized Leases which would be shown as a liability on that Person’s balance sheet prepared in accordance with GAAP.

“ Cash Equivalent Investments ” means (i) short-term obligations of, or fully guaranteed by, the United States of America, (ii) commercial paper rated A-1 or better by S&P or P-1 or better by Moody’s, (iii) demand deposit accounts maintained in the ordinary course of business, and (iv) certificates of deposit issued by and time deposits with commercial banks (whether domestic or foreign) having capital and surplus in excess of $100,000,000; provided in each case that the same provides for payment of both principal and interest (and not principal alone or interest alone) and is not subject to any contingency regarding the payment of principal or interest.

“ Change in Control ” means the acquisition by any Person, or two or more Persons acting in concert, of beneficial ownership (within the meaning of Rule 13d-3 of the Securities and Exchange Commission under the Securities Exchange Act of 1934) of 30% or more of the outstanding shares of voting stock of Unit.

“ Code ” means the Internal Revenue Code of 1986, as amended, reformed or otherwise modified from time to time.

“ Commitment ” means, for each Lender, (i) the obligation of that Lender to make Loans to, and participate in LCs issued on the application of, one or more Borrowers in a total amount not to exceed the amount set forth for that Lender on the Lenders’ Schedule, or (ii) as set forth in any Notice of Assignment relating to any assignment that has become effective under Section 14.3.2, as that amount in either case may be modified from time to time under this Agreement. In no event will a Lender’s Commitment exceed the lesser of that Lender’s Pro Rata Share of (i) the Borrowing Base, or (ii) Maximum Credit Amount.

“ Commitment Fee Rate ” means, at any time, the per annum percentage rate at which commitment fees are accruing on the Available Total Commitment under Section 2.5.2 at that time at the rate set forth in the Pricing Schedule.

“ Consolidated EBITDA ” means Consolidated Net Income plus, to the extent deducted in determining Consolidated Net Income, (a) Consolidated Interest Expense, (b) expense for income and income based taxes paid or accrued, and (c) depreciation, depletion, and amortization, all calculated on a consolidated basis.

“ Consolidated Interest Expense ” means, for any period with respect to any Person, the amount which, under GAAP would be set forth opposite the caption “interest expense” or any like caption (including without limitation, imputed interest included in payments under any Capitalized Lease) on a consolidated income statement of that Person and its Subsidiaries for the period excluding the amortization of any original issue discount.

“ Consolidated Net Income ” means, with reference to any period, the net income (or loss) of the Borrowers and their Subsidiaries calculated on a consolidated basis for such period; but there will not be included in Consolidated Net Income (to the extent it otherwise would be included) any of the following: (a) any after tax extraordinary gain or loss, along with any provisions for taxes on such gain or loss and all related fees and expenses; (b) the cumulative effect of a change in accounting principles; (c) any asset impairment write-downs on Oil and Gas Properties under GAAP or SEC guidelines; (d) any consolidated impairment charges recorded in connection with the application of ASC 350 "Goodwill and Other Intangibles;" (e) any unrealized non-cash gains or losses on charges in respect of Rate Management Obligations or hedging obligations (including those resulting from the application of ASC 815); (f) income or loss attributable to discontinued operations (including operations disposed of during such period whether or not such operations were classified as discontinued), and (g) all deferred financing costs written off, and premiums paid, in connection with any early extinguishment of Indebtedness; and provided further that if the Borrowers and their Subsidiaries shall acquire or dispose of any Property during such period, then Consolidated Net Income shall be calculated after giving the pro forma effect to such acquisition or disposition in accordance with GAAP approved by the Administrative Agent, as if such acquisition or disposition had occurred on the first day of such period.

“ Contingent Obligation ” of a Person means any agreement, undertaking or arrangement by which that Person assumes, guarantees, endorses, contingently agrees to purchase or provide funds for the payment of, or otherwise becomes or is contingently liable on, the obligation or liability of any other Person, or agrees to maintain the net worth or working capital or other financial condition of any other Person, or otherwise assures any creditor of the other Person against loss, including, without limitation, any comfort letter, take-or-pay contract or the obligations of any Person as general partner of a partnership with respect to the liabilities of the partnership.

“ Controlled Group ” means all members of a group of corporations or other business entities and all trades or businesses (whether or not incorporated) which, together with the Borrowers or any of their respective Subsidiaries, are treated as a single employer under Section 414 of the Code.

“ Credit Extension ” means the making of an Advance or the issuance of a LC under this Agreement.

“ Credit Extension Date ” means the Borrowing Date for an Advance or the issuance date for an LC.

“ Credit Parties ” means, collectively, the Borrowers and the Subsidiary Guarantors, and “ Credit Party means any one of them.

“ Default ” means any event or condition that upon notice, lapse of time or both would constitute of Event of Default.

“ Defaulting Lender ” means any Lender, as determined by the Administrative Agent, that has (a) failed to fund any portion of its Loans or participations in LCs within three (3) Business Days of the date required to be funded by it hereunder, (b) notified Unit, the Administrative Agent or the LC Issuer or any Lender in writing that it does not intend to comply with any of its funding obligations under this Agreement or has made a public statement to the effect that it does not intend to comply with its funding obligations under this Agreement or under other agreements in which it commits to extend credit, (c) failed, within three (3) Business Days after request by the Administrative Agent, to confirm that it will comply with the terms of this Agreement relating to its obligations to fund prospective Loans and participations in then outstanding LCs, (d) otherwise failed to pay over to the Administrative Agent, any other Lender or any Borrower any other amount required to be paid by it hereunder within three (3) Business Days of the date when due, unless the subject of a good faith dispute, or (e) (i) become or is insolvent or has a parent company that has become or is insolvent or (ii) become the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee, administrator, assignee for the benefit of creditors or similar Person charged with reorganization or liquidation of its business or custodian, appointed for it, or has taken any action in furtherance of, or indicating its consent to, approval of or acquiescence in any such proceeding or appointment or has a parent company that has become the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee, administrator, assignee for the benefit of creditors or similar Person charged with reorganization or liquidation of its business or custodian appointed for it, or has taken any action in furtherance of, or indicating its consent to, approval of or acquiescence in any such proceeding or appointment; provided, however, that a Lender shall not be a “Defaulting Lender” solely because the Federal Deposit Insurance Corporation or other applicable federal or state regulatory agency has been appointed as receiver, interim receiver, monitor, conservator, trustee or custodian for any parent company of such Lender or acquired an ownership interest in such parent company, provided that and only for as long as (i) such appointment or acquisition does not result in or provide such Lender with immunity from the jurisdiction of courts within the United States or from the enforcement of judgments or writs of attachment on its assets or permit such Lender (or such applicable federal or state regulatory agency or instrumentality) to reject, repudiate, disavow or disaffirm any contracts or agreements made by such Lender, (ii) such Lender confirms in writing, upon request by the Administrative Agent, that it will continue to comply with its obligations to make Loans and fulfill all other obligations required to be made and fulfilled by it hereunder, and (iii) such Lender complies with its obligations to make all Loans and fulfill all other obligations required to be made or fulfilled by it hereunder.

“ Determination Date ” has the meaning assigned thereto in Section 2.6.3(c).

“ Disclosure Schedule ” means Schedule 3.

“ Domestic Subsidiary ” means any Subsidiary that is not a Foreign Subsidiary.

“ Engineering Report ” means each engineering report delivered under Section 6.1(vii) or (viii), as applicable.

“ Environmental Laws ” means any and all federal, state, local and foreign statutes, laws, judicial decisions, regulations, ordinances, rules, judgments, orders, decrees, plans, injunctions, permits, concessions, grants, franchises, licenses, agreements and other governmental restrictions relating to (i) the protection of the environment, (ii) the effect of the environment on human health, (iii) emissions, discharges or releases of pollutants, contaminants, hazardous substances or wastes into surface water, ground water or land, or (iv) the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of pollutants, contaminants, hazardous substances or wastes or the clean-up or other remediation thereof.

“ ERISA ” means the Employee Retirement Income Security Act of 1974, as amended from time to time, and any rule or regulation issued thereunder.

“ Eurodollar Advance ” means an Advance which, other than as provided in Section 2.12, bears interest at the applicable Eurodollar Rate.

“ Eurodollar Base Rate ” means, with respect to a Eurodollar Advance for the relevant Interest Period: (a) the interest rate per annum equal to the average British Bankers Association Interest Settlement Rate (the “ BBA LIBOR “) determined by the Administrative Agent as the offered rate published by Reuters (or other commercially available and generally recognized financial information service or source providing quotations of BBA LIBOR, as designated by the Administrative Agent from time to time) on the page of the applicable Telerate Screen that displays the BBA LIBOR rate for deposits in U.S. dollars (for delivery on the first day of the Interest Period) determined as of approximately 11:00 a.m. (London time) three (3) Business Days before the first day of the Interest Period, and having a term equal to the Interest Period, or (b) in the event the published rate referenced in subsection (a) is not available for any reason or is not otherwise available to the Administrative Agent, the applicable Eurodollar Base Rate for the relevant Interest Period will instead be the rate determined by the Administrative Agent to be the rate at which the Administrative Agent or one of its Affiliate banks offers to place deposits in U.S. dollars with first-class banks in the London interbank market at approximately 11:00 a.m. (London time) three (3) Business Days before the first day of the Interest Period, in the approximate amount of the relevant Eurodollar Loan and having a maturity equal to the Interest Period.

“ Eurodollar Loan ” means a Loan that, except as otherwise provided in Section 2.12, bears interest at the applicable Eurodollar Rate.

“ Eurodollar Rate ” means, with respect to any Interest Period, an interest rate per annum equal to the sum of (i) the quotient of (a) the Eurodollar Base Rate applicable to the Interest Period, divided by (b) one minus the Reserve Requirement (expressed as a decimal) applicable to the Interest Period, plus (ii) the Applicable Margin, based on a 360 day year.

“ Event of Default ” means the occurrence of any of the events described in Section 10.1.1-10.1.15, inclusive.

“ Excluded Taxes ” means, in the case of each Lender, each LC Issuer and the Administrative Agent, (a) Taxes imposed on its overall net income, and franchise taxes imposed on it, by (i) the jurisdiction under the laws of which such Lender, Administrative Agent or LC Issuer is incorporated or organized, (ii) the jurisdiction in which the Administrative Agent’s, the LC Issuer’s or the Lender’s principal executive office is or applicable lending or issuing office located (iii) the jurisdiction with which the Administrative Agent, the Lender or the LC Issuer has a present or former connection (other than a connection arising solely from the transactions specifically contemplated by this Agreement), (b) any Taxes imposed under the laws of the United States of America or any political subdivision thereof or therein that would apply if any payment were made under any of the Loan Documents to the Lender or the LC Issuer on the day the Lender becomes a Lender or the LC Issuer becomes an LC Issuer (or, in either case, designates a new lending or issuing office); (c) and Taxes that are attributable to the Lender’s or the LC Issuer’s failure to comply with Section 3.3(v) of this Agreement; and (d) any applicable Taxes imposed under Sections 1471-1474 of the Code as of the date of this Agreement and any current or future regulations or official interpretations thereof.

“ Existing Subordinated Note Indenture Additional Parties ” means those Subsidiaries of the Credit Parties that are signatories to the Existing Subordinated Note Indenture that are not Credit Parties under this Agreement (consisting of, as of the date of this Agreement, Unit Texas Company, Unit Drilling and Exploration Company, Petroleum Supply Company, Unit Drilling USA Columbia, L.L.C., Unit Drilling Columbia, L.L.C. and Preston County Gas Gathering, L.L.C).

“ Existing Subordinated Notes ” means Unit’s 6-5/8% Senior Subordinated Notes due 2021 issued pursuant to the Existing Subordinated Notes Indenture.

“ Existing Subordinated Notes Indenture ” means the Indenture dated as of May 18, 2011 between Unit and Wilmington Trust FSB and the First Supplemental Indenture dated as of May 18, 2011 by and among Unit, the Subsidiary Guarantors (as therein defined) party thereto and Wilmington Trust FSB, in each case as amended, supplemented or otherwise modified from time to time.

“ Facility Termination Date ” means the date that is five (5) years from the date of this Agreement, as that date may be extended pursuant to Section 3.8, or any earlier date on which the Total Commitment is reduced to zero or otherwise terminated under the terms of this Agreement.

“ Federal Funds Effective Rate ” means, for any day, an interest rate per annum equal to the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers on that day, as published for that day (or, if that day is not a Business Day, for the prior Business Day) by the Federal Reserve Bank of New York, or, if the rate is not published for any day which is a Business Day, the average of the quotations at approximately 10:00 a.m. (Tulsa time) on that day on those transactions received by the Administrative Agent from three Federal funds brokers of recognized standing selected by the Administrative Agent in its sole discretion.

“ Financial Contract ” of a Person means (i) any exchange-traded or over-the-counter futures, forward, swap, hedge or option contract or other financial instrument with similar characteristics, and (ii) any Rate Management Transaction.

“ Floating Rate ” means, for any day, a rate per annum equal to the sum of (i) the Alternate Base Rate for that day, changing when and as the Alternate Base Rate changes, plus (ii) the Applicable Margin.

“ Floating Rate Advance ” means an Advance which, except as otherwise provided in Section 2.12, bears interest at the Floating Rate.

“ Floating Rate Loan ” means a Loan which, except as otherwise provided in Section 2.12, bears interest at the Floating Rate.

“ Foreign Subsidiary ” means (i) any Subsidiary that is not incorporated or organized under the laws of the United States, any State thereof or the District of Columbia, and (ii) any Subsidiary of a Subsidiary described in clause (i).

“ Funded Debt ” means all outstanding long term Indebtedness of the Borrowers in accordance with GAAP excluding deferred Taxes, non cash hedging obligations under ASC 815 and the plugging and abandonment accrued liabilities described in Section 7.8(iv).

“ GAAP ” means generally accepted accounting principles as in effect from time to time in the United States. At any time after the date of this Agreement, the Borrowers, may elect to apply International Financial Reporting Standards (“IFRS”) accounting principles in lieu of GAAP and, on that election, references to GAAP will then be construed to mean IFRS from time to time; provided that any such election, once made, shall be irrevocable and further provided that any calculation or determination in this Agreement that requires the application of GAAP for periods that include fiscal quarters ended before the Borrowers’ election to apply IFRS will remain as previously calculated or determined in accordance with GAAP. The Borrowers will give notice of an election made in accordance with this definition to the Administrative Agent.

“ Governmental Authority ” means any federal, state, local or foreign court or governmental agency, authority, instrumentality or regulatory or legislative body.

“ Highest Lawful Rate ” means, on any day with respect to a Lender to whom Obligations are owed, the maximum non-usurious rate of interest that the Lender is permitted under applicable law to contract for, take, charge or receive with respect to the Obligations for that day. All determinations of the Highest Lawful Rate, or of any interest rate determined by reference to the Highest Lawful Rate, will be made separately for each Lender as appropriate to assure that the Loan Documents are not construed to obligate any Person to pay interest to any Lender at a rate in excess of the Highest Lawful Rate applicable to that Lender.

“ Hydrocarbon Interests ” means all rights, titles, interests and estates now or later acquired in and to (i) Hydrocarbons and (ii) oil and gas leases, or other liquid or gaseous Hydrocarbon or mineral leases, mineral fee interests, overriding royalty and royalty interests, net profit interests, production payment interests, farm outs and farm ins, including any reserved, back in or residual interests of whatever nature.

“ Hydrocarbons ” means oil, gas, casinghead gas, drip gasoline, natural gasoline, condensate, distillate, liquid hydrocarbons, gaseous hydrocarbons and all products refined or separated therefrom.

“ Indebtedness ” of a Person means, without duplications, that Person’s (i) obligations for borrowed money, (ii) obligations representing the deferred purchase price of Property or services (other than accounts payable arising in the ordinary course of the Person’s business payable on terms customary in the trade), (iii) obligations, whether or not assumed, secured by Liens or payable out of the proceeds or production from Property owned or acquired by that Person (other than Permitted Encumbrances), (iv) obligations which are evidenced by notes, bonds, debentures, acceptances, or other similar instruments, (v) obligations to purchase securities or other Property arising out of or in connection with the sale of the same or substantially similar securities or Property, (vi) Capitalized Lease Obligations, (vii) Contingent Obligations in respect of other Indebtedness, (viii) obligations under Financial Contracts, including Rate Management Obligations, (ix) obligations to reimburse issuers of Letters of Credit, (x) obligations with respect to payments received in consideration of oil, gas, or other minerals yet to be produced at the time of payment (including obligations under “take-or-pay” contracts to deliver gas in return for payments already received and the undischarged balance of any production payment created by that Person or for the creation of which the Person directly or indirectly received payment), (xi) obligations with respect to other obligations to deliver goods or services in consideration of advance payments therefor; (xii) any other obligation for borrowed money or other financial accommodation which in accordance with GAAP would be shown as a liability on the consolidated balance sheet of that Person, (xiii) all obligations of such Person secured by a Lien on any Property of such Person regardless of whether the Indebtedness secured thereby shall have been assumed by that Person or is non-recourse to the credit of such Person, and (xiv) all liabilities of such Person as a general partner of a partnership for obligations of such partnership of the nature described in clauses (i) through (xiii) above.

“ Indemnified Taxes ” means Taxes, other than Excluded Taxes, imposed on the Administrative Agent, any Lender or any LC Issuer with respect to any payment made by any Credit Party under any Loan Document.

“ Interest Period ” means, with respect to a Eurodollar Advance, a period of one, two, three or six months commencing on a Business Day selected by Unit under this Agreement. The Interest Period will end on the day that corresponds numerically to the date one, two, three, or six months thereafter. If there is no numerically corresponding day in the next, second, third or sixth succeeding month, the Interest Period will end on the last Business Day of the next, second, third or sixth succeeding month. If an Interest Period would otherwise end on a day that is not a Business Day, the Interest Period will end on the next succeeding Business Day. If the next succeeding Business Day falls in a new calendar month, the Interest Period will end on the immediately preceding Business Day.

“ Investment ” of a Person means any loan, advance (other than commission, travel and similar advances to officers and employees made in the ordinary course of business), extension of credit (other than accounts receivable arising in the ordinary course of business on terms customary in the trade) or contribution of capital by that Person to another Person and any stocks, bonds, mutual funds, partnership interests, notes, debentures or other securities owned by that Person.

“ LC Application” has the meaning assigned to it in Section 2.19.3.

“ LC Issuer ” means BOk (or any subsidiary or affiliate of BOk designated by BOk) or any other Lender that agrees to be an LC Issuer in its capacity as issuer of LCs under this Agreement.

“ LC Obligations ” means, at any time, the sum, without duplication, of (i) the total undrawn stated amount under all LCs outstanding at that time plus (ii) the total unpaid amount at that time of all Reimbursement Obligations.

“ LC Sublimit ” means $50,000,000 unless otherwise agreed in writing among the LC Issuer, Unit and the Required Lenders.

“ Lender Counterparty ” means any Person counterparty to a Financial Contract who is (or, at the time such Financial Contract was entered into, was) a Lender or an Affiliate of a Lender.

“ Lenders ” means the lending institutions now or later listed on the signature pages of this Agreement.

“ Lenders’ Schedule ” means Schedule 2.

“ Letter of Credit ” of a Person means a letter of credit or similar instrument that is issued on the application of that Person or on which that Person is an account party or for which that Person is in any way liable.

“ Lien ” means any lien (statutory or other), mortgage, pledge, hypothecation, assignment, deposit arrangement, encumbrance or preference, priority or other security agreement or preferential arrangement of any kind or nature whatsoever (including, without limitation, the interest of a vendor or lessor under any conditional sale, Capitalized Lease or other title retention agreement).

“ Loan ” means, with respect to a Lender, that Lender’s Advances made under Article 2 (or any conversion or continuation of that Advance).

“ Loan Documents ” means this Agreement, the LC Applications, any Notes issued under Section 2.14, and each Subsidiary Guaranty.

“ Material Adverse Effect ” means a material adverse effect on (i) the business, Property, condition (financial or otherwise), or results of operations of the Credit Parties taken as a whole (taking into account the present value of any indemnification in favor of the Borrowers or any applicable insurance coverage), (ii) the ability of any of the Borrowers to perform their obligations under the Loan Documents, or (iii) the validity or enforceability of any of the Loan Documents or the rights or remedies of the Administrative Agent, the LC Issuer or the Lenders under the Loan Documents.

“ Material Domestic Subsidiary ” means any Material Subsidiary that is a Domestic Subsidiary.

“ Material Indebtedness ” means Indebtedness of any Credit Party in an outstanding principal amount of $25,000,000 or more (or its equivalent in any currency other than U.S. dollars).

“ Material Indebtedness Agreement ” means any agreement under which any Material Indebtedness was created, is governed, or which provides for the incurrence of Indebtedness in an amount which would constitute Material Indebtedness (whether or not an amount of Indebtedness constituting Material Indebtedness is outstanding thereunder).

“ Material Subsidiary ” means a Subsidiary of any of the Borrowers having (i) at least ten percent (10%) of the consolidated total assets of the Borrowers and their Subsidiaries (determined as of the last day of the most recent fiscal quarter of the Borrowers) or (ii) at least ten percent (10%) of the consolidated revenues of the Borrowers and their Subsidiaries for the fiscal year of Unit then most recently ended. For purposes of this Agreement, the term “Material Subsidiary” shall not include a Borrower.

“ Materials of Environmental Concern ” means any gasoline or petroleum (including crude oil or any fraction thereof) or petroleum products or any hazardous or toxic substances, materials or wastes, or pollutants, defined or regulated as such in or under any Environmental Law, including asbestos, polychlorinated biphenyls, urea formaldehyde insulation, coal combustion byproducts or waste, boiler slag, scrubber residue, or flue desulphurization residue or comparable or similar products, substances or materials (whether liquid, solid, gaseous or otherwise).

“ Maximum Credit Amount ” means the maximum amount of Credit Extensions available to the Borrowers under Article 2 from Lenders.

“ Moody’s ” means Moody’s Investors Service, Inc.

“ Multiemployer Plan ” means a Plan under which the Borrowers or any member of the Controlled Group is a party to which more than one employer is obligated to make contributions.

“ Net Cash Proceeds ” means in connection with any issuance or sale of equity interests or indebtedness securities or instruments or the incurrence of loans, the cash proceeds received from such issuance or incurrence, net of attorneys’ fees, investment banking fees, accountants’ fees, underwriting discounts and commissions and other customary fees and expenses actually incurred in connection with such issuances or sales.

“ Obligations ” means all unpaid principal of and accrued and unpaid interest on the Loans, all Reimbursement Obligations, all Rate Management Obligations under Financial Contracts with any Lender or any Lender Counterparty, all accrued and unpaid fees and all expenses, reimbursements, indemnities and other obligations of the Borrowers to the Lenders or to any Lender, the Administrative Agent, the LC Issuer, or any indemnified party arising under the Loan Documents, including all treasury and treasury related services.

“ Oil and Gas Properties ” means all Hydrocarbon Interests from time to time owned by any Credit Party or in which one of the Credit Parties has an interest, including without limitation, (i) Property now or hereafter pooled or unitized with the Hydrocarbon Interests, (ii) all presently existing or future unitization, pooling agreements and declarations of pooled units and the units created in connection therewith (including without limitation all units created under orders, regulations and rules of any Governmental Authority) which may affect all or any portion of the Hydrocarbon Interests, (iii) all operating agreements, contracts and other agreements which relate to any Hydrocarbon Interests or the production, sale, purchase, exchange or processing of Hydrocarbons from or attributable to that Hydrocarbon Interests, (iv) all Hydrocarbons in and under and which may be produced and saved or attributable to the Hydrocarbon Interests, including as-extracted collateral and all oil in tanks and all rents, issues, profits, proceeds, products, revenues and other incomes from or attributable to the Hydrocarbon Interests, (v) all tenements, hereditaments, appurtenances and Property in any manner appertaining, belonging, affixed or incidental to the Hydrocarbon Interests, (vi) and all Property, rights, titles, interests and estates described or referred to above, including any and all Property (real or personal) now owned or hereafter acquired and situated on, used, held for use or useful in connection with the operating, working or development of any of the Hydrocarbon Interests or Property (excluding drilling rigs, automotive equipment or other personal property which may be on the premises for the purpose of drilling a well or for other similar temporary uses), and (vii) any and all oil wells, gas wells, injection wells or other wells, buildings, structures, fuel separators, liquid extraction plants, plant compressors, pumps, pumping units, field gathering systems, tanks and tank batteries, fixtures, valves, fittings, machinery and parts, engines, boilers, meters, apparatus, equipment, appliances, tools, implements, cables, wires, towers, casing, tubing and rods, surface leases, rights-of-way, easements and servitudes together with all additions, substitutions, replacements, accessions and attachments to any and all of the foregoing, in each case limited to the interest of the applicable Credit Party in those assets.

“ Other Taxes ” means any present or future stamp or documentary Taxes, and any other excise or property Taxes which arise because of any payment made under this Agreement, any Note, LC Application or from the signing or delivery of or otherwise with this Agreement, any Note, or LC Application.

“ Outstanding Credit Exposure ” means, as to any Lender at any time, the sum of (i) the total principal amount of its then outstanding Loans, plus (ii) an amount equal to its Pro Rata Share of the LC Obligations at that time.

“ Payment Date ” means the day prescribed in Section 2.16 for payment of Eurodollar Loans and Floating Rate Loans, respectively.

“ PBGC ” means the Pension Benefit Guaranty Corporation.

“ Permitted Encumbrances ” means any Lien permitted by Section 7.6.

“ Person ” means any natural person, corporation, firm, joint venture, partnership, limited liability company, association, enterprise, trust or other entity or organization, or any government or political subdivision or any of their agencies, departments, or instrumentalities.

“ Plan ” means an employee pension benefit plan which is covered by Title IV of ERISA or subject to the minimum funding standards under Section 412 of the Code as to which the Borrowers or any member of the Controlled Group may have any liability.

“ Pricing Schedule ” means Schedule 1.

“ Prime Rate ” means, as of any date, the annual rate published in the “Bonds, Rates and Yields” column of The Wall Street Journal (Southwest Edition) as the prime rate, which rate will not necessarily be the “best” or lowest rate quoted or used from time to time by a Lender or the Lenders. Borrowers acknowledge and agree that the Lenders may make loans based on other rates or indices as well. Should that reference to such prime rate become unavailable during the term of the Loans or by Financial Contracts or should The Wall Street Journal otherwise cease to publish or quote a prime or base rate, or should The Wall Street Journal be merged, consolidated, liquidated or dissolved in a manner that it loses its separate identity, then the Prime Rate will be a substitute index selected and designated by the Administrative Agent following notice to Unit. Any change in the Prime Rate shall be effective as of the date of the change but the Prime Rate will not change more often than once each day. Under no circumstances will the interest rate on the Notes be more than the Highest Lawful Rate.

“ Pro Rata Share ” means, with respect to a Lender, a portion equal to a fraction the numerator of which is that Lender’s Commitment and the denominator of which is the Total Commitment; provided, in the case of Section 2.20 when a Defaulting Lender shall exist, “Pro Rata Share” means, (a) for any Defaulting Lender, zero percent (0%), and (b) for any Lender other than a Defaulting Lender, the percentage of the Total Commitments (disregarding any Defaulting Lender’s Commitment) represented by that Lender’s Commitment. If the Commitments have terminated or expired, the Pro Rata Share will be determined upon the Commitments most recently in effect, giving effect to any assignments and to any Lender’s status as a Defaulting Lender.

“ Property ” of a Person means any interest of that Person in any kind of property, whether real, personal, tangible, intangible, or mixed, of that Person, or other assets owned, leased or operated by that Person.

“ Rate Management Obligations ” of a Person means all obligations of that Person, whether absolute or contingent and regardless of how or when created, arising, evidenced or acquired (including all renewals, extensions, supplements, replacements, modifications, and substitutions of those obligations) under (i) all Financial Contracts, including Rate Management Transactions, and (ii) all cancellations, buy backs, reversals, terminations or assignments of any Financial Contracts, including Rate Management Transactions.

“ Rate Management Transaction ” means any transaction (including an agreement pertaining to that transaction) now existing or hereafter entered by one or more Borrowers which is a rate swap, basis swap, hedge, forward rate transaction, commodity swap, commodity option, equity or equity index swap, equity or equity index option, bond option, interest rate option, foreign exchange transaction, cap transaction, floor transaction, collar transaction, forward transaction, currency swap transaction, cross-currency rate swap transaction, currency option or any other similar transaction or price/commodity protection device (including any option with respect to any of these transactions) or any combination thereof, whether linked to one or more interest rates, foreign currencies, commodity prices, equity prices, or other financial measures. However, a “Rate Management Transaction” will not include any contract for the purchase and sale of natural gas, oil or natural gas liquids entered into in the ordinary course of business and on customary trade terms.

“ Regulation D ” means Regulation D of the Board of Governors of the Federal Reserve System and any successor or other regulation or official interpretation of the Board of Governors relating to reserve requirements applicable to member banks of the Federal Reserve System.

“ Regulation U ” means Regulation U of the Board of Governors of the Federal Reserve System and any successor or other regulation or official interpretation of the Board of Governors relating to the extension of credit by banks for the purpose of purchasing or carrying margin stocks applicable to member banks of the Federal Reserve System.

“ Reimbursement Obligations ” means the total of all obligations of the Borrowers under Section 2.19 to reimburse the LC Issuer for amounts paid by the LC Issuer for any one or more drawings under LCs.

“ Reportable Event ” means a reportable event as defined in Section 4043 of ERISA, for which the notice requirements to the PBGC have not been waived. A failure to meet the minimum funding standard of Section 412 of the Code and of Section 302 of ERISA will be a Reportable Event.

“ Required Lenders ” means those Lenders having in total at least 66.67% of the Total Commitment or, if the Total Commitment has been terminated, those Lenders having in total at least two-thirds (66.67%) of the Total Outstanding Credit Exposure.

“ Reserve Requirement ” means, with respect to an Interest Period, the maximum total reserve requirement (including all basic, supplemental, marginal and other reserves) which is imposed under Regulation D on Eurocurrency liabilities.

“ S&P ” means Standard and Poor’s Ratings Services, a division of The McGraw Hill Companies, Inc.

“ Scheduled Redetermination ” means any redetermination of the Borrowing Base under Section 2.6.3.

“ SEC ” means the Securities and Exchange Commission.

“ Single Employer Plan ” means a Plan maintained by the Borrowers or any member of the Controlled Group for employees of the Borrowers or any member of the Controlled Group.

“ Special Redetermination ” means any redetermination of the Borrowing Base under Section 2.6.5 or 2.6.6.

“ Subsidiary ” of a Person means (i) any corporation more than 50% of the outstanding securities having ordinary voting power of which will at the time be owned or controlled, directly or indirectly, by that Person or by one or more of their Subsidiaries or by that Person and one or more of its Subsidiaries, or (ii) any partnership, limited liability company, association, joint venture or similar business organization more than 50% of the ownership interests having ordinary voting power of which will at the time be so owned or controlled, provided that any associations, joint ventures or other relationships (a) which are established under a standard form operating agreement or similar agreement or which are partnerships for purposes of federal income taxation only, (b) which are not corporations or partnerships (or subject to the Uniform Partnership Act) under applicable state law, and (c) whose businesses are limited to the exploration, development and operation of oil, gas or mineral properties and interests owned directly by the parties in those associations, joint ventures or relationships, will not be deemed to be “Subsidiaries” of that Person. Unless otherwise expressly provided, all references in this Agreement to a “Subsidiary” will mean a Subsidiary of any of the Credit Parties.

“ Subsidiary Guarantor ” means each present or future Material Domestic Subsidiary and each other Subsidiary that becomes a party to the Subsidiary Guaranty.

“ Subsidiary Guaranty ” means the Guaranty Agreement, substantially in the form of Exhibit E to be executed on behalf of each Subsidiary Guarantor in favor of the Administrative Agent for the ratable benefit of the Lenders, for the Obligations of the Borrowers under this Agreement.

“ Subsidiary Guaranty Joinder Agreement ” means the Joinder Agreement, substantially in the form of Schedule 1 to the Subsidiary Guaranty, to be executed and delivered by each new Subsidiary Guarantor in accordance with the provisions of Section 9.1.

“ Superior Cash Flow ” means the loan value attributed by the Lenders or Required Lenders, as applicable, to the operations (including throughput volume in the pipeline systems) of Superior Pipeline Company, L.L.C. and its Wholly-Owned Subsidiaries in accordance with Section 2.6 which determination shall be conclusive absent manifest error.

“ Taxes ” means all present or future taxes, duties, levies, imposts, deductions, charges or withholdings, and any and all liabilities with respect to the foregoing.

“ Total Commitment ” means the total of the Commitments of all Lenders, as adjusted from time to time under this Agreement. In no event will the Total Commitment exceed the lesser of (i) the Borrowing Base or (ii) the Maximum Credit Amount.

“ Total Outstanding Credit Exposure ” means the total of the Outstanding Credit Exposure of all the Lenders.

“ Unfunded Liabilities ” means that amount by which the present value of all vested and unvested accrued benefits under all Single Employer Plans exceeds the fair market value of those Plans’ assets allocable to those benefits, all determined as of the most recent valuation date for those Plans using PBGC actuarial assumptions for single employer plan terminations.

“ Wholly-Owned Subsidiary ” of a Person means (i) any Subsidiary all of the outstanding voting securities of which are owned or controlled, directly or indirectly, by that Person or one or more Wholly-Owned Subsidiaries of that Person, or by that Person and one or more Wholly-Owned Subsidiaries of that Person, or (ii) any partnership, limited liability company, association, joint venture or similar business organization 100% of the ownership interests having ordinary voting power of which will at the time be so owned or controlled.

“ Withdrawal Liability ” means liability to a Multiemployer Plan as a result of a complete or partial withdrawal from such Multiemployer Plan, as such terms are defined in Part I of Subtitle E of Title IV of ERISA.

The above definitions will be equally applicable to both the singular and plural forms of the defined terms.

1.2 Exhibits and Schedules; Additional Definitions . All Exhibits and Schedules attached to this Agreement are a part of this Agreement for all purposes. Unless the context otherwise requires or unless otherwise provided in this Agreement the terms defined in this Agreement which refer to a particular agreement, instrument or document also refer to and include all renewals, extensions, modifications, amendments and restatements of that agreement, instrument or document, provided that nothing in this section will be construed to authorize any such renewal, extension, modification, amendment or restatement.

1.3 Reference and Titles . All references in this Agreement to Exhibits, Schedules, articles, sections, subsections and other subdivisions refer to the Exhibits, Schedules, articles, sections, subsections and other subdivisions of this Agreement unless expressly provided otherwise. Exhibits and Schedules to any Loan Document are incorporated by reference into the Loan Document. References to any document, instrument, or agreement (a) will include all exhibits, schedules, and other attachments thereto, and (b) will include all documents, instruments, or agreements issued or executed in replacement or restatement thereof. Titles appearing at the beginning of any subdivisions are for convenience only and do not constitute any part of the subdivisions and will be disregarded in construing the language contained in the subdivisions. The words “this Agreement,” “this instrument,” “herein,” “hereof,” “hereby,” “hereunder” and words of similar import refer to this Agreement as a whole and not to any particular subdivision unless expressly so limited. The words “include”, “includes” and “including” will be deemed to be followed by the phrase “without limitation”. The phrases “this section” and “this subsection” and similar phrases refer only to the sections or subsections in which these phrases occur. Pronouns in masculine, feminine and neuter genders will be construed to include any other gender, and words in singular form will be construed to include the plural and vice versa, unless the context otherwise requires.

1.4 Accounting Terms and Determinations . Except only as otherwise expressly provided in this Agreement (including in the definition of GAAP), all accounting terms will be interpreted, and all financial statements and certificates and reports as to financial matters required to be delivered to the Administrative Agent or the Lenders under this Agreement shall be prepared in accordance with GAAP, as applied on a consistent basis. References to “days” will mean calendar days, unless the term “Business Day” is used. Unless otherwise specified, references to any particular Person also refer to its successors and permitted assigns. If the Borrowers notify the Administrative Agent that the Borrowers request an amendment to any provision hereof to eliminate the effect of any change occurring after the date hereof in GAAP or in the application thereof on the operation of such provision regardless of whether any such notice is given before or after such change in GAAP or in the application thereof, then such provision shall be interpreted on the basis of GAAP as in effect and applied immediately before such change shall have become effective until such notice shall have been withdrawn or such provision amended in accordance herewith. To avoid any confusion, if a change in GAAP, such as changes to lease accounting rules, occurring after the Effective Date hereof, affects in any way the calculation of any material terms or covenants hereunder, such terms or covenants will continue to be governed on the basis of GAAP as in effect and applied immediately before such change upon and following such notification contemplated above from the Borrower.

1.5 Calculations and Determinations . All calculations under the Loan Documents of interest and fees will be made on the basis of actual days elapsed (including the first day but excluding the last) and a year of 360 days except only for interest accruals on Floating Rate Loans which will be based on the number of days lapsed in a 365-366 day year.

1.6 Joint Preparation; Construction of Indemnities and Releases . The Loan Documents have been reviewed and negotiated by sophisticated parties with access to legal counsel and no rule of construction will apply which would require or allow any Loan Document to be construed against any party because of its role in drafting that Loan Document. All indemnification and release provisions of this Agreement will be construed broadly (and not narrowly) in favor of the Persons receiving indemnification or being released.

ARTICLE 2

THE CREDITS

2.1 Commitments; Initial Total Commitment; Maximum Credit Amount . From and including the date of this Agreement and up to the Facility Termination Date, each Lender severally agrees, on the terms and conditions of this Agreement, to (i) make Loans to the Borrowers and (ii) participate in LCs issued on the request of the Borrowers, provided that, after giving effect to the making of each such Loan and the issuance of each such LC, the Lender’s Outstanding Credit Exposure does not exceed its Commitment and the Total Outstanding Credit Exposure does not exceed the Total Commitment. Subject to the terms of this Agreement, Unit, as the designated borrowing agent on behalf of all of the Borrowers, may borrow, repay and re-borrow at any time before the Facility Termination Date. Each Lender’s Commitment will expire on the Facility Termination Date. The LC Issuer will issue LCs on the terms and conditions set forth in Section 2.19. The initial Total Commitment is $250,000,000 and the Maximum Credit Amount is $750,000,000. Any increases in the Total Commitment will be subject to and in accordance with Section 14.6 and any increase in the Maximum Credit Amount requires the written consent of all Lenders.

2.2 Minimum Amount of Each Advance . . Each Eurodollar Advance will be in the minimum amount of $2,000,000 (and in additional multiples of $1,000,000), and each Floating Rate Advance will be in the minimum amount of $200,000 (and in additional multiples of $100,000), provided, that any Floating Rate Advance may be in the amount of the Available Total Commitment.

2.3 Ratable Loan . The Lenders will make each Advance according to their Pro Rata Shares.

2.4 Types of Advances . The Advances may be Floating Rate Advances or Eurodollar Advances, or a combination thereof. Unit will select advances on behalf of the Borrowers in accordance with Sections 2.9 and 2.10.

2.5 Facility Fee; Commitment Fee ; Late Fees; Agency and Other Fees.

2.5.1. Facility Fee . Borrowers will pay to the Administrative Agent for the benefit of the Lenders a fully earned and non-refundable upfront facility fee calculated by the respective invited/solicited commitment levels tendered to each Lender, as provided in Addendum I to the separate Summary of Terms and Conditions dated as of July 7, 2011 agreed to by the Administrative Agent. Any increases in the Total Commitment above the amounts designated in Section 2.1 will be contingent on the Borrowers’ payment of an applicable market rate facility fee on the amount of the increase(s) to Administrative Agent for the benefit of the Lenders increasing its or their Commitments or on the Commitment of any Additional Lender(s) under Section 14.6.

2.5.2. Commitment Fee . The Borrowers shall pay the Administrative Agent for the Pro Rata Share of each Lender a commitment fee equal to the per annum Commitment Fee Rate (as set forth on the Pricing Schedule) times the average daily amount of the Available Total Commitment from the date of this Agreement through the Facility Termination Date. Accrued commitment fees are payable in arrears within 10 days of Unit’s receipt of the quarterly invoice from the Administrative Agent following the close of each calendar quarter and on the Facility Termination Date. All accrued commitment fees are payable on the effective date of any termination of the Commitments of the Lenders to make Credit Extensions.

2.5.3. Late Fees . To the extent any payment due under a Loan Document is not paid within ten (10) calendar days of its scheduled due date, then, in addition to any interest (accrued at the contract rate of the Notes and prior to imposition of the default rate pursuant to Section 2.12) or other fees and charges due, Borrowers will pay to the Administrative Agent for the allocable benefit of the Lenders a late fee equal to five percent (5.0%) of the amount of the payment that was required to have been made.

2.5.4. Agency and Other Fees . Borrowers will pay agency and other fees to the Administrative Agent in the amounts and on the terms agreed to in writing between the Administrative Agent and the Borrowers.

2.6 Borrowing Bas e .

2.6.1. Subject to the terms, provisions, and limitations of this Agreement, until redetermined, increased or reduced, the Borrowing Base is $537,500,000 (after taking into consideration the automatic reduction required as of the closing date by Section 2.6.8). The Borrowing Base is based on (i) the loan value which the Lenders assign to the various Credit Parties’ Oil and Gas Properties being evaluated, (ii) the loan value which the Lenders assign to Superior Cash Flow, and (iii) any other credit factors (including without limitation the assets, liabilities, cash flow, hedged and unhedged exposure to price, foreign exchange rate, and interest rate changes, business, properties, prospects, management and ownership of Credit Parties) as the Lenders deem significant. The Lenders and the Administrative Agent have no obligation to agree on or designate the Borrowing Base at any particular amount, whether in relation to the Total Commitment or otherwise.

2.6.2. On March 1 and September 1 of each year, beginning March 1, 2012 (it being stipulated Unit has timely furnished such information for September 1, 2011), Unit will furnish to each Lender the information Administrative Agent has then requested concerning the Credit Parties’ businesses and properties (including the information specified in Sections 6.1(vii), (viii) and (ix)).

2.6.3. Starting no later than October 1, 2011 and no later than each following April 1 st and October 1 st , the Borrowing Base will be determined in accordance with the following procedure:

(a) The Administrative Agent will submit in writing to the Lenders its proposed Borrowing Base amount;

(b) Each Lender will have ten (10) Business Days to notify the Administrative Agent in writing if it agrees or disagrees with the proposed amount; provided, however, no increase in the Borrowing Base will become effective unless approved in writing by all Lenders. If, within the time set out in the preceding sentence,

(1)

All Lenders agree, then the new Borrowing Base will be the amount proposed by the Administrative Agent (which shall be deemed to include any Lender that has not timely notified Administrative Agent in writing of its approval or disapproval, such silence being deemed to be an approval of the proposed Borrowing Base amount by the silent (non responding) Lender); or

(2)

(i) Not all Lenders agree with the proposal of the Administrative Agent, or (ii) if the Total Commitment has been terminated or has expired and the Required Lenders have not affirmatively approved the Administrative Agent’s proposal with respect to a decrease in, or maintenance of, the Borrowing Base, then the Administrative Agent and the Required Lenders will, within five (5) Business Days, diligently attempt in good faith to agree on a Borrowing Base amount. If agreement is reached then the amount determined by the Administrative Agent and the Required Lenders will be the Borrowing Base amount; or

(3)

The Administrative Agent and the Required Lenders cannot agree on the amount of the Borrowing Base within the five (5) Business Day period, then the proposed Borrowing Base will be the amount calculated by the Administrative Agent as the “weighted arithmetic average” of the Borrowing Base as determined by each individual Lender and communicated to the Administrative Agent in writing. For purposes of this paragraph, the “weighted arithmetic average” of the Borrowing Base will be determined by first multiplying the Borrowing Base proposed in writing to the Administrative Agent by each Lender’s Pro Rata Share, and then adding the results of each calculation, with the Borrowing Base then being the lesser of (i) the resulting weighted arithmetic average amount, or (ii) the amount of the Borrowing Base as last determined under this Agreement.

(c) The Administrative Agent will then promptly notify Unit in writing of the new Borrowing Base amount. The amount of the Borrowing Base subject to the Administrative Agent’s notice will be effective as of the date the notice is sent to Unit (a “ Determination Date “) unless, within five (5) Business Days following receipt of the Administrative Agent’s notice, Unit designates in writing a lesser amount in which case the lesser amount designated by Unit will be the Borrowing Base amount effective when the Administrative Agent receives Unit’s written designation.

2.6.4. If Unit does not timely furnish all the information requested by the Administrative Agent in subsection 2.6.2, Administrative Agent may designate the Borrowing Base at any amount the Lenders or the Required Lenders, as applicable, reasonably determine (and may redetermine the Borrowing Base from time to time) until each Lender receives all the requested information. Once the Lenders have received all the requested information, Lenders or the Required Lenders, as applicable, in their discretion, will designate a new Borrowing Base under the procedures in subsection 2.6.3.

2.6.5. In addition to Scheduled Redeterminations, the Required Lenders are permitted to make a Special Redetermination of the Borrowing Base once between each Determination Date by notifying the Administrative Agent and Borrowers. Any Special Redetermination by the Required Lenders shall be in addition to any reduction of the Borrowing Base by the Required Lenders under Section 7.4(iv).

2.6.6. In addition to Scheduled Redeterminations, any other Special Redeterminations pursuant to Section 2.6 and the voluntary Commitment reduction pursuant to Section 2.8.3, Unit may request a Special Redetermination of the Borrowing Base once between each Scheduled Redetermination. In addition, Unit may request Special Determinations from time to time as significant developments, exploration or Acquisition opportunities are presented to Borrowers. Borrower shall deliver written notice of such Special Redetermination request to the Administrative Agent which shall include (i) a reserve report or engineering report prepared as of a date not more than 30 days prior to such request, and (ii) the amount of the Borrowing Base requested by Unit and the date on which Unit requests such redetermined Borrowing Base to be effective. Upon receipt of the reserve report or engineering report, the Administrative Agent shall, subject to approval of the Required Lenders, or all Lenders in the event of a proposed increase in the Borrowing Base, redetermine the Borrowing Base in accordance with the calculation procedures of Section 2.6.3(a), (b) and (c), provided that the Administrative Agent and the Lenders shall have thirty (30) days from Administrative Agent's receipt of the information requested of Unit under clauses (i) and (ii) above to agree with the Lenders on the redetermined amount of the Borrowing Base and so notify Unit in writing.

2.6.7. If at any time, the Total Outstanding Credit Exposure exceeds the lesser of (i) the Borrowing Base, or (ii) the Total Commitment (a “ Deficiency “) because of a reduction in the Borrowing Base resulting from a redetermination in accordance with this Section 2.6 (excluding Section 2.6.8), Administrative Agent will notify Unit in writing of the Deficiency and within ten (10) days from the date of that deficiency notice, Unit will elect one of the following options:

(a) To prepay the Loans in an amount equal to or more than the Deficiency;

(b) Dedicate to this Agreement (including the negative pledge provision of Section 7.12) other Oil and Gas Properties or assets acceptable to the Administrative Agent and the Required Lenders that are not then included in the Borrowing Base that are of a value, as determined by the Administrative Agent and the Required Lenders, such that the Outstanding Credit Exposure does not exceed the Borrowing Base (as adjusted to include the values of the additional Oil and Gas Properties and/or midstream assets); or

(c) Start monthly principal payments each equal to the amount of the Deficiency divided by the number of whole calendar months between the date of the Deficiency notice and the next Scheduled Redetermination.

If Unit elects to (i) prepay the Loans under clause (a) or (ii) commence monthly principal payments under clause (c), the prepayment or first monthly payment, as applicable, will be due within twenty (20) days after the date of Unit’s timely election. The prepayment or monthly principal payments will be applied in reduction of the principal balance of the Loans. If Unit elects to commit Oil and Gas Properties under clause (b) above, the Borrowers will provide the Administrative Agent with descriptions of the Oil and Gas Properties or other approved assets (together with any applicable current valuations and engineering reports which may be requested by the Administrative Agent).

2.6.8. The Borrowing Base will be automatically reduced if and to the extent a Borrower issues or incurs Indebtedness (other than any Obligations) as follows: (i) a dollar ($1.00) for dollar ($1.00) reduction if the Indebtedness is on a pari passu basis in right of payment with the Obligations or (ii) an amount equal to a twenty five cents ($0.25) reduction for each one dollar ($1.00) amount of Indebtedness incurred after the effective date of this Agreement that is expressly subordinated in right of payment to the Obligations (including subordinated Indebtedness convertible to equity in Unit) so long as such Indebtedness is in compliance with the limitations of Section 7.2(ix).

2.6.9. Unit may, from time to time upon ten (10) days prior written notice to the Administrative Agent, reduce the Borrowing Base by designating a Borrowing Base which is lower than the Borrowing Base then in effect. Any such designation by Unit shall be effective on the tenth (10 th ) day following the date of the Administrative Agent's receipt of such written notice.

2.7 Repayment of Loans; Evidence of Loans »

2.7.1. Borrowers hereby unconditionally and jointly and severally promise to pay to the Administrative Agent, for the account of each Lender, on the Facility Termination Date, the then unpaid principal amount of all Loans made to them. Borrowers agree to repay the principal amount of each Loan made to them and the interest accrued thereon in U.S. dollars.

2.7.2. Each Lender shall maintain in accordance with its usual practice an account or accounts evidencing the indebtedness of Borrowers to such Lender resulting from each Loan made by such Lender, including the amounts of principal and interest payable and paid to such Lender from time to time hereunder.

2.7.3. The Administrative Agent shall maintain accounts in which it shall record (i) the amount of each Loan made hereunder, the type and the Interest Period applicable thereto, (ii) the amount of any principal or interest due and payable or to become due and payable from Borrowers to each Lender hereunder and (iii) the amount of any sum received by the Administrative Agent hereunder for the account of the Lenders and each Lender's Pro-Rata Share thereof.

2.7.4. The entries made in the accounts maintained pursuant to paragraph (b) or (c) of this Section shall be prima facie evidence of the existence and amounts of the obligations recorded therein; provided that the failure of any Lender or the Administrative Agent to maintain such accounts or any error therein shall not in any manner affect the obligation of the Credit Parties to repay the Loans in accordance with the terms of this Agreement.

2.7.5. Any Lender may request that Loans made by it be evidenced by a promissory note. In such event, the Borrowers shall prepare, jointly execute and deliver to the order of such Lender one or more promissory notes payable to the order of such Lender (or, if requested by such Lender, to such Lender and its registered assigns) and in a form approved by the Administrative Agent. Thereafter, the Loans evidenced by such promissory note(s) and interest thereon shall at all times (including after assignment pursuant to Section 14.3) be represented by one or more promissory notes in such form payable to the order of the payee named therein (or, if a promissory note is a registered note, to such payee and its registered assigns).

2.8 Principal Payments ; Termination and Reduction of Commitment ..

2.8.1. Optional Principal Payments . The Borrowers may at any time and from time to time, without penalty or premium, on prior notice to the Administrative Agent pay (i) all outstanding Floating Rate Advances, or (ii) a part of the outstanding Floating Rate Advance in a minimum amount of $200,000 (and any additional multiples of $100,000). The Borrowers may from time to time, without premium or penalty (but subject to the payment of any funding indemnification amounts required by Section 3.5 including applicable breakage fees due hereunder), on three (3) Business Days’ prior written notice to the Administrative Agent, pay all (i) outstanding Eurodollar Advances, or, (ii) a part of the outstanding Eurodollar Advances in a minimum total amount of $2,000,000 (and any additional integral multiples of $1,000,000).

2.8.2. Mandatory Principal Payments . In addition to the mandatory principal payments required due to a Deficiency in accordance with Section 2.6.7, if at any time a Deficiency occurs as a result of the a reduction of the Borrowing Base under Section 2.6.8 or 7.4, Borrowers will, within three (3) Business Days following written notice from Administrative Agent promptly prepay the principal of the Loans with proceeds of such Indebtedness issuance or asset sale in an amount at least equal to the Deficiency (or, if the Loans have been paid in full, deposit with the Administrative Agent the amount required to eliminate the Deficiency, which amount shall be applied by the Administrative Agent to the payment of Reimbursement Obligations with respect to any LCs as they become due and payable; any balance remaining after (i) all LCs have expired or been fully drawn on or (ii) after the Deficiency no longer exists will be returned to Unit) together with interest during the period of the Deficiency. Any principal or interest prepaid under this subsection will be in addition to, and not in lieu of, all payments otherwise then required under the Loan Documents.

2.8.3. Termination and Reduction of Commitments .

(a) Unless previously terminated, the Commitments shall terminate on the Facility Termination Date.

(b) The Borrowers may once between each Scheduled Redetermination reduce the Commitments; provided that (i) each reduction of the Commitments shall be in an amount that is an integral multiple of $5,000,000 and not less than $25,000,000 (or, if less, the remaining amount of the Commitments), and (ii) the Borrowers shall not terminate or reduce the Commitments if, after giving effect to any concurrent prepayment of the Loans in accordance with Section 2.6.7 or 2.8.2, the Total Outstanding Credit Exposure would exceed the Borrowing Base.

(c) The Borrowers shall notify the Administrative Agent of any election to terminate or reduce the Commitments under paragraph (b) of this Section 2.8.3 at least three (3) Business Days prior to the effective date of such termination or reduction, specifying such election and the effective date thereof. Promptly following receipt of any notice, the Administrative Agent shall advise the Lenders of the contents thereof. Each notice delivered by the Borrowers pursuant to this paragraph (c) shall be irrevocable; provided that a notice of termination of the Commitments delivered by the Borrowers may state that such notice is conditioned upon the effectiveness of other credit facilities or refinancing, in which case such notice may be revoked by the Borrowers (by notice to the Administrative Agent on or prior to the specified effective date) if such condition is not satisfied. Any termination or reduction of the Commitments shall be permanent, provided that the Commitments may be increased in accordance with Section 14.6. Each reduction of the Commitments shall be made ratably among the Lenders in accordance with their respective Commitments.

2.9 Method of Selecting Loan Types and Interest Periods for New Advances . Unit will select each type of Advance and, in the case of a Eurodollar Advance, the applicable Interest Period. Unit will give the Administrative Agent irrevocable notice (a “ Borrowing Notice “) not later than 11:00 a.m. (Tulsa time) on the same Business Day as the Borrowing Date of each Floating Rate Advance and three Business Days before the Borrowing Date for each Eurodollar Advance. Unit’s notice will specify:

(i)	the Borrowing Date, which must be a Business Day, of the Advance;

(ii)	the total amount of the Advance;

(iii)

the type (Floating Rate or Eurodollar) of Advance selected; and

(iv)	in the case of a Eurodollar Advance, the applicable Interest Period.

Not later than 1:00 p.m. (Tulsa time) on each Borrowing Date, each Lender will make available its Loan or Loans in funds immediately available in Tulsa to the Administrative Agent at its address specified under Article 15. The Administrative Agent will make the funds received from the Lenders immediately available to the Borrowers at the Administrative Agent’s address.

2.10 Conversion and Continuation of Outstanding Advances . Each Floating Rate Advance will continue as Floating Rate Advance unless converted into Eurodollar Advance under this Section 2.10 or is repaid. Each Eurodollar Advance will continue as a Eurodollar Advance until the end of its applicable Interest Period, at which time the Eurodollar Advance will be automatically converted into a Floating Rate Advance unless (x) the Eurodollar Advance is or was repaid or (y) Unit gives the Administrative Agent a Conversion/Continuation Notice requesting that, at the end of the Interest Period, the Eurodollar Advance continue as a Eurodollar Advance for the same or another Interest Period. Subject to the terms of Section 2.2, Unit may elect from time to time to convert all or any part of a Floating Rate Advance into a Eurodollar Advance. Unit will give the Administrative Agent irrevocable notice (a “ Conversion/Continuation Notice “) of each conversion of a Floating Rate Advance into a Eurodollar Advance or continuation of a Eurodollar Advance. A Conversion/Continuation Notice must be given by 11:00 a.m. (Tulsa time) on a day that is at least three Business Days before the date of the requested conversion or continuation and specify:

(i)	the requested date, which must be a Business Day, of the conversion or continuation;

(ii)	the total amount of and the type of the Advance (Floating Rate Advance or Eurodollar Advance) that is to be converted or continued; and

(iii)

the duration of the applicable Interest Period.

2.11 Interest Rate . Each Advance will bear interest at a variable per annum rate equal to the Eurodollar Rate or the Floating Rate as applicable, except as otherwise provided in Section 2.12. Each Floating Rate Advance will bear interest on its outstanding principal amount, for each day from and including the date the Advance is made or is automatically converted from a Eurodollar Advance into a Floating Rate Advance under Section 2.10 (but excluding the date it is paid or is converted into a Eurodollar Advance under Section 2.10) at an annual rate equal to the Floating Rate for that day. Changes in the rate of interest on that part of any Advance maintained as a Floating Rate Advance will take effect simultaneously with each change in the Alternate Base Rate. Each Eurodollar Advance will bear interest on its outstanding principal amount from and including the first day of the Interest Period applicable to it until (but not including) the last day of that Interest Period. The Administrative Agent will determine the applicable interest rate for each Eurodollar Advance based on Unit’s selections under Sections 2.9 and 2.10 and otherwise in accordance with the terms of this Agreement. No Interest Period may end after the Facility Termination Date.

2.12 Effect of Default or Deficiency on Advances/Rates Applicable After Default or Deficiency . Despite Section 2.9, 2.10, or 2.11, during a Default or Deficiency the Required Lenders may, at their option by written notice to Unit, declare that no Advance will be made as, converted into, or continued as a Eurodollar Advance and no LCs will be issued. During the continuance of an Event of Default, each Eurodollar Advance and each Floating Rate Advance will bear interest for the remainder of the applicable Interest Period at the rate otherwise applicable to the Interest Period plus an additional two hundred basis points (2.0%) per annum, and the LC Fee will be increased by an additional two hundred basis points (2.00%) per annum. During a Default that remains uncured (prior to an Event of Default) or a Deficiency, interest will be determined at the applicable Level IV Status Floating Rate per annum plus an additional fifty basis points (0.50%) as to Floating Rate Advances or applicable Level IV Status Eurodollar Rate plus an additional two hundred basis points (2.00%) as to Eurodollar Rate Loans per annum as to Eurodollar Rate. During a Default or Event of Default under Subsections 10.1.6 or 10.1.7, the interest rates set forth above and the increase in the LC Fee will apply to all Credit Extensions without any election, notice or other action on the part of the Administrative Agent or any Lender; provided, however, the default interest rate specified above shall not accrue at the same time a late fee is being assessed pursuant to Section 2.5.3, such election to be at the option of the Administrative Agent and the Required Lenders.

2.13 Method of Paymen t of Obligations . All Obligation payments will be made, without setoff, deduction, or counterclaim, in immediately available funds to the Administrative Agent at the Administrative Agent’s address specified by Section 15.1, by 12:00 noon (Tulsa time) on the date when due (other than payments of Rate Management Obligations owed to Lender Counterparties, which shall be made in accordance with the applicable Financial Contracts governing such Rate Management Obligations) and will (except in the case of Reimbursement Obligations for which the LC Issuer has not been fully indemnified by the Lenders, or as otherwise required under this Agreement) be applied ratably by the Administrative Agent among the Lenders. The Administrative Agent will promptly pay in the same type of funds that the Administrative Agent received to each Lender at the Lender’s address specified in Section 15.1 (or at the address specified in a notice received by the Administrative Agent from the Lender)any payments the Administrative Agent receives on behalf of the Lender. The Administrative Agent may charge Borrowers’ accounts (other than any Excluded Account) at BOk for each payment of principal, interest, Reimbursement Obligations and fees due under this Agreement. Each reference to the Administrative Agent in this Section 2.13 will also be deemed to refer, and will apply equally, to the LC Issuer, in the case of payments required to be made by the Borrowers to the LC Issuer under Section 2.19.6.

Subject to the provisions of Section 11.4, all principal or interest payments on any Note or Loan will be applied first to any interest then due and payable, then to principal, and last to any prepayment of principal and interest in compliance with Section 2.8. All distributions of amounts described above will be made by Administrative Agent pro rata to each Lender then owed Obligations described in this section in proportion to all amounts owed to Administrative Agent and all Lenders which are described in this Section 2.13; provided that if any Lender then owes payments to LC Issuer for the purchase of a participation under Section 2.19.2 or to Administrative Agent under Section 13.7, any amounts otherwise distributable under this section to the Lender will be deemed to belong to LC Issuer, or Administrative Agent, respectively, to the extent of the unpaid payments, and Administrative Agent will apply those amounts to pay such unpaid payments rather than distribute those amounts to the Lender.

2.14 Payment of Fees . All fees paid under this Agreement will be paid in US Dollars on the dates due, in immediately available funds to the Administrative Agent (or the LC Issuer, in the case of fees payable to it). Fees paid will not be refundable under any circumstances except in the case of inadvertent but conclusive overpayment by Borrowers.

2.15 Telephonic Notices . The Lenders and the Administrative Agent may extend, convert, or continue Advances, effect selections of types of Advances, and transfer funds based on telephonic notices made by any person or persons the Administrative Agent or any Lender in good faith believes authorized to act on behalf of the Borrowers. Borrowing Notices and Conversion/Continuation Notices may be given telephonically. Unit will deliver promptly to the Administrative Agent a written confirmation executed by an Authorized Officer of each telephonic notice. If the written confirmation differs in any material respect from the action taken by the Administrative Agent and any Lenders, the records of the Administrative Agent and the Lenders will govern absent manifest error.

2.16 Payment Date . Interest accrued on each Floating Rate Advance will be payable on the last day of each month, on any date on which the Floating Rate Advance is prepaid (whether due to acceleration or otherwise), and on the Facility Termination Date. Interest accrued on the principal amount of any Floating Rate Advance converted into a Eurodollar Advance on a day other than the last day of a month will be payable on the date of conversion. Interest accrued on each one month (30 day), two months (60 days), or three months (90 days) Interest Period for a Eurodollar Advance will be payable on the last day of its applicable Interest Period, on any date on which the Eurodollar Advance is prepaid (whether by acceleration or otherwise), and on the Facility Termination Date. Interest accrued on each Eurodollar Advance having an Interest Period longer than three months (i.e., six months (180 days) Interest Period) will also be payable on the last day of each three-month interval during the Interest Period. Interest will be payable from the day an Advance is made but not for the day of payment if the payment is received before 12:00 noon (local time) at the place of payment. If any payment of principal of or interest on an Advance is due on a day which is not a Business Day, that payment will be made on the next succeeding Business Day and, in the case of a principal payment, the extension of time will be included in computing interest on the payment.

2.17 Notification of Advances, Interest Rates, and LC Requests . The Administrative Agent will promptly notify each Lender of the contents of each Borrowing Notice, Conversion/Continuation Notice, or repayment notice it receives as well as changes in the applicable per annum rate of interest pursuant to the Pricing Schedule. Promptly after notice from the LC Issuer, the Administrative Agent will notify each Lender of the contents of each request for issuance of an LC.

2.18 Non-Receipt of Funds by the Administrative Agent . Unless Unit or a Lender, as the case may be, notifies the Administrative Agent before the date on which it is to make a payment to the Administrative Agent of (i) in the case of a Lender, the proceeds of a Loan or (ii) in the case of the Borrowers, a payment of principal, interest or fees, that it does not intend to make the payment, the Administrative Agent may assume that the payment has been made. The Administrative Agent may, but will not be obligated to, make the amount of the payment available to the intended recipient in reliance on that assumption. If the Lender or the Borrowers, as the case may be, did not make the payment, the recipient of the payment will when requested by the Administrative Agent, repay the amount of the payment with interest to Administrative Agent. Interest will apply for each day starting the day the payment was made until the day the Administrative Agent receives the repayment. Interest will be calculated at a rate per annum equal to (x) in the case of payment by a Lender, the Federal Funds Effective Rate for the day for the first three days and then the interest rate applicable to the relevant Loan or (y) in the case of payment by the Borrowers, the interest rate applicable to the relevant Loan.

2.19 Letters of Credit .

2.19.1. Issuance . When requested by Unit, the LC Issuer will issue standby Letters of Credit (each, a “ LC “) and renew, extend, increase, decrease or otherwise modify each LC (“ Modify ,” and each action a “ Modification “), from time to time before the Facility Termination Date; but only if immediately after each LC is issued or Modified, (i) the total amount of the outstanding LC Obligations does not exceed the LC Sublimit and (ii) the Total Outstanding Credit Exposure does not exceed the Total Commitment. No LC will have an expiration date more than one year from its date of issuance (or, in the case of a Modification, one year after the Modification). If an expiration date for any LC is within five (5) Business Days before the Facility Termination Date, Borrowers will deposit with the Administrative Agent on the Facility Termination Date immediately available funds in an amount equal to the undrawn amount of the LC. The Administrative Agent may apply such funds to the payment of Reimbursement Obligations with respect to the LC as they become due and payable, and any balance remaining after such LC has expired or been fully drawn upon will be returned to the Borrowers.

2.19.2. Participations . On the issuance or Modification of an LC, the LC Issuer will be deemed, without further action by any party, to have unconditionally and irrevocably sold to each Lender, and each Lender will be deemed, without further action by any party, to have unconditionally and irrevocably purchased from the LC Issuer, a participation in the LC (and each Modification of the LC) and the related LC Obligations in proportion to its Pro Rata Share.

2.19.3. Notice . Unit will give the LC Issuer notice before 11:00 a.m. (Tulsa time) at least one Business Day before the proposed date of issuance or Modification of an LC, specifying the beneficiary, the proposed date of issuance (or Modification) and the expiration date of the LC. The issuance or Modification of an LC by the LC Issuer is subject to the LC Issuer’s approval and the Borrowers signing and delivering an LC Application or other instruments and agreements relating to the LC as the LC Issuer may reasonably request (each, a “ LC Application “). In the event of a conflict between the terms of this Agreement and the terms of an LC Application, the terms of this Agreement will control.

2.19.4. LC Fees . The Borrowers will pay to the Administrative Agent, for the account of the Lenders in accordance with their respective Pro Rata Shares, a per annum letter of credit fee when an LC is issued. The amount of the fee will be equal to the greater of $500.00 or a per annum rate equal to the Applicable Margin for Eurodollar Loans on the stated amount of the LC (each fee described in this sentence an “ LC Fee “). The Borrowers will also pay to the LC Issuer for its own account at the time of issuance of an LC, a fronting fee in an amount equal to 0.125% of the initial stated amount, and any documentary and processing charges incurred in connection with the issuance or Modification of and draws under LCs in accordance with the LC Issuer’s then standard schedule for those charges.

2.19.5. Administration; Reimbursement by Lenders . If the LC Issuer receives demand for payment by a beneficiary under an LC, the LC Issuer will notify the Administrative Agent. The Administrative Agent will then promptly notify the Borrowers and each other Lender of the amount demanded to be paid and the proposed payment date (the “ LC Payment Date “). The responsibility of the LC Issuer to the Borrowers and each Lender will be only to determine that the documents (including each demand for payment) delivered under each LC in connection with the presentment conforms in all material respects with the LC. In the absence of gross negligence or willful misconduct by the LC Issuer, each Lender will be unconditionally and irrevocably liable without regard to the occurrence of any Default, Event of Default or any condition precedent, to reimburse the LC Issuer on request for (i) the Lender’s Pro Rata Share of the amount of each payment made by the LC Issuer under an LC to the extent the amount is not reimbursed by the Borrowers under Section 2.19.6, plus (ii) interest on the amount to be reimbursed by the Lender for each day from the date of the LC Issuer’s demand for the reimbursement (or, if the demand is made after 12:00 noon (Tulsa time) on that date, from the next succeeding Business Day) to the date paid. The interest to be paid will be calculated at a rate of interest per year equal to the Federal Funds Effective Rate for the first three days and then at a rate of interest equal to the rate applicable to Floating Rate Advances.

2.19.6. Reimbursement by Borrowers . The Borrowers are irrevocably and unconditionally obligated to reimburse the LC Issuer on or before the applicable LC Payment Date for any amounts to be paid by the LC Issuer under subsection 2.19.5. The Borrowers’ reimbursement obligation will be without presentment, demand, protest or other formalities of any kind but either the Borrowers or any Lender may assert any claim for direct (but not consequential) damages suffered by the Borrowers or the Lender to the extent, but only to the extent, caused by (i) the willful misconduct or gross negligence of the LC Issuer in determining whether a request presented under any LC issued by it complied with the terms of the LC or (ii) the LC Issuer’s failure to pay under any LC issued by it after the presentation to it of a request strictly complying with the terms and conditions of the LC. All amounts paid by the LC Issuer and remaining unreimbursed by the Borrowers will bear interest, payable on demand, for each day until paid at a rate per year equal to (x) the rate applicable to Floating Rate Advances for that day if that day falls on or before the applicable LC Payment Date and (y) the sum of two hundred basis points (2.0%) plus the rate applicable to Floating Rate Advances for that day if that day falls after the LC Payment Date. The LC Issuer will pay to each Lender in accordance with its Pro Rata Share all amounts received by it from the Borrowers as payment, in whole or in part, for Reimbursement Obligations in regard to any LC issued by the LC Issuer, but only if the Lender has paid the LC Issuer for the LC under Section 2.19.5. Subject to the terms and conditions of this Agreement, the Borrowers may request an Advance to satisfy any Reimbursement Obligation.

2.19.7. Obligations Absolute . The Borrowers’ obligations under this Section 2.19 are absolute and unconditional under any and all circumstances and irrespective of any setoff, counterclaim, or defense to payment that the Borrowers may have or have had against the LC Issuer, any Lender, or any beneficiary of a LC. Borrowers acknowledge and agree that the LC Issuer and the Lenders will not be responsible for, and the Borrowers’ Reimbursement Obligation in respect of any LC will not be affected by, among other things, the validity or genuineness of documents or of any endorsements thereon, even if those documents should in fact prove to be in any or all respects invalid, fraudulent or forged, or any dispute between or among the Borrowers, any of their Affiliates, the beneficiary of any LC, any financing institution, or other party to whom any LC may be transferred or any claims or defenses whatsoever of the Borrowers or of any of their Affiliates against the beneficiary of any LC or any transferee. The LC Issuer will not be liable for any error, omission, interruption or delay in transmission, dispatch or delivery of any message or advice, however transmitted, in connection with any LC. The Borrowers agree that any action taken or omitted by the LC Issuer or any Lender under or in connection with each LC and the related drafts and documents, if done without gross negligence or willful misconduct, will be binding on the Borrowers and will not put the LC Issuer or any Lender under any liability to the Borrowers. Nothing in this subsection 2.19.7 will limit the right of the Borrowers to make a claim for damages as provided in subsection 2.19.6.

2.19.8. Actions of LC Issuer . The LC Issuer is entitled to rely, and will be fully protected in, relying on any LC, draft, writing, resolution, notice, consent, certificate, affidavit, letter, cablegram, telegram, telecopy, telex or teletype message, statement, order or other document believed by it to be genuine and correct and to have been signed, sent or made by the proper Person or Persons, and on advice and statements of legal counsel, independent accountants, and other experts selected by the LC Issuer. The LC Issuer will be fully justified in failing or refusing to take any action under this Agreement unless it will first have received the advice or concurrence of the Required Lenders as it reasonably deems appropriate or it will first be indemnified to its reasonable satisfaction by the Lenders against any and all liability and expense which may be incurred by it by reason of taking or continuing to take such action. Despite any other provision of this Section 2.19, the LC Issuer will in all cases be fully protected in acting, or in refraining from acting, under this Agreement in accordance with a request of the Required Lenders, and that request and any action taken or failure to act due to that request will be binding on the Lenders and any future holders of a participation in any LC.

2.19.9. Indemnification . The Borrowers will indemnify and hold harmless each Lender, the LC Issuer and the Administrative Agent, and their respective directors, officers, administrative agents and employees from and against any and all claims, and damages, losses, liabilities, costs or expenses which a Lender, the LC Issuer or the Administrative Agent may incur (or which may be claimed against a Lender, the LC Issuer or the Administrative Agent by any Person) by reason of or in connection with the issuance, signing and delivery, transfer of or payment, or failure to pay under any LC or any actual or proposed use of any LC, including any claims, damages, losses, liabilities, costs, or expenses which the LC Issuer incurs by reason of or in connection with (i) the failure of any other Lender to fulfill or comply with its obligations to the LC Issuer (but this does not affect any rights the Borrowers may have against a defaulting Lender) or (ii) by reason of or on account of the LC Issuer issuing any LC which specifies that the term “Beneficiary” included in the LC includes any successor by operation of law of the named Beneficiary, but which LC does not require that any drawing by any successor Beneficiary be accompanied by a copy of a legal document, satisfactory to the LC Issuer, evidencing the appointment of such successor Beneficiary. The Borrowers will not be required to indemnify any Lender, the LC Issuer or the Administrative Agent for any claims, damages, losses, liabilities, costs or expenses to the extent, but only to the extent, caused by (x) the willful misconduct or gross negligence of the LC Issuer in determining whether a request presented under an LC complied with the terms of the LC or (y) the LC Issuer’s failure to pay under any LC after the presentation to it of a request strictly complying with the terms and conditions of the LC. Nothing in this Section 2.19.9 is intended to limit the obligations of the Borrowers under any other provision of this Agreement, provided that to the extent of any inconsistency between this Section 2.19.9 and Section 12.6.1, the provisions of this Section 2.19.9 shall control; and provided further that this Section 2.19.9 shall not apply to Taxes, which shall be exclusively governed by Section 3.3.

2.19.10. Lenders’ Indemnification . Each Lender will, in accordance with its Pro Rata Share, indemnify the LC Issuer, its Affiliates and their respective directors, officers, administrative agents and employees (to the extent not reimbursed by the Borrowers) against any cost, expense (including reasonable counsel fees and disbursements), claim, demand, action, loss or liability (except resulting from the indemnitees’ gross negligence or willful misconduct or the LC Issuer’s failure to pay under any LC after the presentation to it of a request strictly complying with the terms and conditions of the LC) that the indemnitees may suffer or incur in connection with this Section 2.19 or any action taken or omitted by the indemnitees under this Section 2.19.

2.19.11. Existing Letters of Credit . Each letter of credit issued and outstanding under the Existing Credit Agreement as of the date hereof will be deemed to constitute an LC issued under this Agreement on the date hereof for all purposes of the Loan Documents; provided that no additional LC fees or fronting fees will be payable with respect to such letters of credit under Section 2.19.4. for which LC fees and fronting fees have been paid in full.

2.20 Defaulting Lenders . Notwithstanding any provision of this Agreement to the contrary, if any Lender becomes a Defaulting Lender, then the following provisions shall apply for so long as such Lender is a Defaulting Lender:

(a)

fees pursuant to Section 2.5.2 shall cease to accrue on the unfunded portion of the Commitment of such Defaulting Lender;

(b)

the Commitment and Outstanding Credit Exposure of such Defaulting Lender shall not be included for any purpose in determining whether all Lenders or the Required Lenders have taken or may take any action hereunder (including any consent to any amendment or waiver pursuant to Section 11.2), provided that any waiver, amendment or modification requiring the consent of all Lenders or each affected Lender which affects such Defaulting Lender differently than other affected Lenders shall require the consent of such Defaulting Lender and further provided that any redetermination or affirmation of the Borrowing Base shall occur without the participation of the Defaulting Lender, but the Commitment (i. e., the Pro Rata Share of the Borrowing Base of a Defaulting Lender) will not be increased without the consent of the Defaulting Lender;

(c)

if any LC Obligations exists at the time a Lender becomes a Defaulting Lender then: (i) all or any part of the LC Obligations of such Defaulting Lender shall be reallocated among the non-Defaulting Lenders in accordance with their respective Pro Rata Share (for the purpose of such reallocation the Defaulting Lender's Commitment will be disregarded in determining each non-Defaulting Lender's Pro Rata Share) but only to the extent (x) the sum of all non-Defaulting Lenders’ Outstanding Credit Exposures plus such Defaulting Lender’s LC Obligations does not exceed the total of all non-Defaulting Lenders’ Commitments and (y) the conditions set forth in Section 4.2 are satisfied at such time; (ii) if the reallocation described in clause (i) above cannot, or can only partially, be effected, the Borrower shall within two Business Days following notice by the Administrative Agent (x) first, collateralize such Defaulting Lender’s LC Obligations (after giving effect to any partial reallocation pursuant to clause (i) above) in accordance with the procedures set forth in Section 2.19.10 for so long as such LC Obligations are outstanding; (iii) if the Borrowers cash collateralizes any portion of such Defaulting Lender’s LC Obligations pursuant to this Section 2.20(c), the Borrowers shall not be required to pay any fees to such Defaulting Lender pursuant to Section 2.19.4 with respect to such Defaulting Lender’s LC Obligations during the period such Defaulting Lender’s LC Obligations are cash collateralized; (iv) if the LC Obligations of the non-Defaulting Lenders are reallocated pursuant to this Section 2.20(c), then the fees payable to the Lenders pursuant to Section 2.19.4 and Section 2.12(b) shall be adjusted in accordance with such non-Defaulting Lenders’ Pro Rata Shares; or (v) if any Defaulting Lender’s LC Obligations are neither cash collateralized nor reallocated pursuant to this Section 2.20(c), then, without prejudice to any rights or remedies of the LC Issuer or any Lender hereunder, all commitment fees that otherwise would have been payable to such Defaulting Lender (solely with respect to the portion of such Defaulting Lender’s Commitment that was utilized by such LC Obligation) and letter of credit fees payable under Section 2.19.4 with respect to such Defaulting Lender’s LC Obligation shall be payable to the LC Issuer until such LC Obligations are cash collateralized and/or reallocated; and

(d)

so long as any Lender is a Defaulting Lender, the LC Issuer shall not be required to issue, amend or increase any LC, unless it is satisfied that the related exposure will be 100% covered by the Commitments of the non-Defaulting Lenders and/or cash collateral will be provided by the Borrowers in accordance with Section 2.20(c), and participating interests in any such newly issued or increased LC shall be allocated among non-Defaulting Lenders in a manner consistent with Section 2.20(c)(i) (and Defaulting Lenders shall not participate therein). In the event that the Administrative Agent, the Borrowers and the LC Issuer each agrees that a Defaulting Lender has adequately remedied all matters that caused such Lender to be a Defaulting Lender, then the LC Obligations of the Lenders shall be readjusted to reflect the inclusion of such Lender’s Commitment and on such date such Lender shall purchase at par such of the Loans of the other Lenders as the Administrative shall determine may be necessary in order for such Lender to hold such Loans in accordance with its Pro Rata Share.

2.21 Ratable Payments . If any Lender, whether by setoff or otherwise, has payment made to it on its Outstanding Credit Exposure (other than payments received under Article 3) in a greater proportion than that received by any other Lender, such Lender agrees, promptly on demand, to purchase a portion of the Total Outstanding Credit Exposure held by the other Lenders so that after such purchase each Lender will hold its Pro Rata Share of the Total Outstanding Credit Exposure. If any Lender, whether in connection with setoff or amounts which might be subject to setoff or otherwise, receives collateral or other protection for its Obligations (other than its Rate Management Obligations, if any) or such amounts which may be subject to setoff, such Lender agrees, promptly on demand, to take such action necessary such that all Lenders share in the benefits of such collateral ratably in proportion to their respective Pro Rata Shares of the Total Outstanding Credit Exposure.

ARTICLE 3

YIELD PROTECTION; TAXES

3.1 Yield Protection . If, on or after the date of this Agreement, the adoption of any law or any governmental or quasi-governmental rule, regulation, policy, guideline or directive (whether or not having the force of law), or any change in its interpretation or administration by any governmental or quasi-governmental authority, central bank, or comparable agency charged with its interpretation or administration thereof or compliance by any Lender or applicable banking address of the LC Issuer with any request or directive of any such authority, central bank or comparable agency:

(i) imposes or increases or deems applicable any reserve, assessment, insurance charge, special deposit, or similar requirement against assets of, deposits with (or for the account of), or credit extended by, any Lender or the LC Issuer (other than reserves and assessments taken into account in determining the interest rate applicable to Eurodollar Advances): or

(ii) imposes any other condition the result of which is to increase a Lender’s cost, the interbank eurocurrency deposit market cost or the LC Issuer’s costs of making, funding or maintaining its Eurodollar Loans or of issuing or participating in LCs, or reduces any receivable of a Lender, the interbank eurocurrency deposit market or the LC Issuer in connection with its Eurodollar Loans, LCs or participations therein, or requires any Lender, the interbank Eurocurrency deposit market or the LC Issuer to make any payment calculated by reference to the amount of Eurodollar Loans, LCs or participations therein held or interest or LC Fees received by it, by an amount deemed material by such Lender or the LC Issuer as the case may be and the result of any of the foregoing is to increase the cost to such Lender or the LC Issuer, as the case may be, of making or maintaining its Eurodollar Loans or Commitment or of issuing or participating in LCs or to reduce the return received by such Lender, the interbank eurocurrency deposit market or the LC Issuer, as the case may be, in connection with such Eurodollar Loans, Commitment, LCs or participations therein,

then, within 15 days of demand by the Administrative Agent or the LC Issuer, as the case may be, to Unit, the Borrowers will pay Administrative Agent for the account of the Lender or the LC Issuer, as the case may be, that additional amount or amounts as will compensate the Lender or the LC Issuer, as the case may be, for the increased cost or reduction in the amount received by it; provided that the Borrowers shall not be required to compensate a Lender or the LC Issuer pursuant to this Section 3.1 for any increased costs or reductions incurred more than 365 days prior to the date that such Lender or the LC Issuer, as the case may be, notifies Unit of the change giving rise to such increased costs or reduction and of the Lender's or the LC Issuer's intentions to claim compensation therefor.

The foregoing provisions of this Section 3.1 shall not apply to Taxes, which shall be governed exclusively by Section 3.3.

3.2 Changes in Capital Adequacy Regulations . If a Lender or the LC Issuer determines, in good faith, the amount of capital required or expected to be maintained by the Lender or the LC Issuer, or any corporation controlling the Lender or the LC Issuer is increased as a result of a Change, then, within 15 days of demand to Unit by the Lender or the LC Issuer, the Borrowers will pay the Lender or the LC Issuer the amount necessary to compensate the shortfall in the rate of return on the portion of the increased capital which the Lender or the LC Issuer determines in good faith is attributable to this Agreement, its Outstanding Credit Exposure or its Commitment (after taking into account the Lender’s or the LC Issuer’s policies as to capital adequacy). “ Change “ means (i) any change after the date of this Agreement in the Risk-Based Capital Guidelines or (ii) any adoption of or change in any other law, governmental or quasi-governmental rule, regulation, policy, guideline, interpretation, or directive (whether or not having the force of law) after the date of this Agreement which affects the amount of capital required or expected to be maintained by any Lender or the LC Issuer or any corporation controlling any Lender or the LC Issuer. “ Risk-Based Capital Guidelines “ means (i) the risk-based capital guidelines in effect in the United States on the date of this Agreement, including transition rules, and (ii) the corresponding capital regulations promulgated by regulatory authorities outside the United States implementing the July 1988 report of the Basle Committee on Banking Regulation and Supervisory Practices Entitled “ International Convergence of Capital Measurements and Capital Standards ,” including transition rules, and any amendments to the regulations adopted prior to the date of this Agreement. Notwithstanding anything in this Agreement to the contrary, (i) the Dodd-Frank Wall Street Reform and Consumer Protection Act and all requests, rules, guidelines or directives thereunder, issued in connection therewith or in implementation thereof, and (ii) all requests, proposed or final rules, interpretations, guidelines and directives promulgated by the Bank for International Settlements, the Basel Committee on Banking Supervision (or any successor or similar authority) or the United States or foreign regulatory authorities, will in each case be deemed to be “Change”, regardless of the date enacted, adopted, issued or implemented.

3.3 Taxes . (i) All payments by the Borrowers to or for the account of any Lender, the LC Issuer or the Administrative Agent or under any Note or LC Application will be made free and clear of and without deduction for any Indemnified Taxes or Other Taxes, unless such withholding is required by any law. If the Borrowers are required by law to deduct Indemnified Taxes or Other Taxes from any payment to a Lender, the LC Issuer, or the Administrative Agent, to the extent not prohibited by applicable law, (a) the payment will be increased so that after making all required deductions (including deductions applicable to payments under this Section 3.3) the Lender, the LC Issuer, or the Administrative Agent (as the case may be) receives an amount equal to the payment it would have received had no deductions been made, (b) the Borrowers will make the deductions, (c) the Borrowers will pay the full amount deducted to the relevant authority in accordance with applicable law, and (d) the Borrowers will furnish Administrative Agent a copy of a receipt evidencing payment within 30 days after the payment is made.

(i)	In addition, without duplication of any payments made pursuant to Section 3.3 (i), the Borrowers will pay any Other Taxes to the relevant Governmental Authority in accordance with applicable law.

(ii)

The Borrowers agrees to indemnify the Administrative Agent, the LC Issuer, and each Lender for the full amount of Indemnified Taxes or Other Taxes paid by the Administrative Agent, the LC Issuer or a Lender and any liability (including penalties, interest and expenses) associated with those payments. Payments properly due under this indemnification will be made within 30 days following the date the Administrative Agent, the LC Issuer or a Lender requests payment.

(iii)

If the U.S. Internal Revenue Service or any other governmental authority of the United States or any other country (or any of their political subdivisions) asserts a claim that the Administrative Agent did not properly withhold tax from payments to or for the account of any Lender because the appropriate form was not delivered or properly completed by such Lender, because such Lender failed to notify the Administrative Agent of a change in circumstances which rendered its exemption from withholding ineffective, or for any other reason, then such Lender will indemnify the Administrative Agent, fully for all amounts paid, directly or indirectly, by the Administrative Agent as tax, withholding for the tax, or otherwise, including penalties and interest, and any taxes imposed by any jurisdiction on amounts payable to the Administrative Agent under this subsection, together with all related costs and expenses (including attorney’s fees and time charges of attorneys for the Administrative Agent. The obligations of the Lenders under this Section 3.3(iii) will survive the payment of the Obligations and termination of this Agreement. Any liability under this Section 3.3(iii) will not be a liability of the Borrowers.

(iv)

Any Lender or LC Issuer that is entitled to an exemption from or reduction of withholding Taxes (including backup withholding Taxes) with respect to payments under this Agreement shall deliver to the Borrowers (with a copy to the Administrative Agent), at the time or times upon the reasonable request of the Borrowers, such properly completed and executed documentation prescribed by applicable law or reasonably requested by the Borrowers as will permit such payments to be made without withholding or at a reduced rate of withholding; provided, no such Lender or LC Issuer will be required to deliver or submit copies of any tax returns or schedules therewith.

(v)

If the Administrative Agent, a Lender or an LC Issuer determines, in its reasonable discretion, that it has received a refund or credit of any Taxes or Other Taxes as to which it has been indemnified by any Borrower or with respect to which any Borrower has paid additional amounts pursuant to this Section 3.3, it shall pay over such refund to such Borrower (but only to the extent of indemnity payments made, or additional amounts paid, by such Borrower under this Section 3.3 with respect to the Indemnified Taxes or Other Taxes giving rise to such refund), net of all reasonable out-of-pocket expenses of the Administrative Agent, such Lender or such LC Issuer and without interest (other than any interest paid by the relevant Governmental Authority with regard to the refund or credit); provided that such Borrower, upon the request of the Administrative Agent, such Lender or such LC Issuer, agrees to repay the amount paid over to such Borrower (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) to the Administrative Agent, such Lender or such LC Issuer in the event the Administrative Agent, such Lender or such LC Issuer is required to repay such refund to such Governmental Authority.

3.4 Availability of Eurodollar Advances. If a Lender determines that maintenance of its Eurodollar Loans at a suitable banking location would violate any applicable law, rule, regulation, or directive, whether or not having the force of law, then, upon notice by that Lender to the Borrowers and the Administrative Agent, such Lender’s obligation to continue to make or convert Eurodollar Loans shall be suspended until that Lender notifies the Borrowers and the Administrative Agent that the circumstances giving rise to such determination no longer exist and (ii) any Eurodollar Advances of that Lender shall be converted to Floating Rate Advances, to the extent required to comply with such Laws or change, subject to the payment of any funding indemnification amounts required by Section 3.5. If the Required Lenders determine that (i) deposits of a type and maturity appropriate to match fund Eurodollar Advances are not available or (ii) the interest rate applicable to Eurodollar Advances does not accurately reflect the cost of making or maintaining Eurodollar Advances, then, upon notice by the Required Lenders to the Borrowers and the Administrative Agent, the availability of Eurodollar Advances, and continuations thereof and conversions thereto, will be suspended to the extent required to comply with such Laws or change until the Required Lenders notify the Borrowers and the Administrative Agent that the circumstances giving rise to such determination no longer exist and (ii) require any affected Eurodollar Advances to be repaid or converted to Floating Rate Advances, subject to the payment of any funding indemnification amounts required by Section 3.5.

3.5 Funding Indemnificatio n . If for any reason a payment of a Eurodollar Advance occurs on a date which is not the last day of the applicable Interest Period or a Eurodollar Advance is not made on the date specified by the Borrowers for any reason other than a breach of this Agreement by one or more Lenders, the Borrowers will indemnify each Lender for any resulting loss or cost incurred by it.

3.6 Mitigation Obligations . If any Lender requests compensation under Sections 3.1, 3.2 or 3.4 or if any Credit Party is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender or indemnify any Lender pursuant to Section 3.3, then such Lender shall use reasonable efforts to designate a different lending office for funding or booking its Loans hereunder or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the reasonable judgment of such Lender, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to Sections 3.1, 3.2, 3.3 or 3.3, as the case may be, in the future and (ii) would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender.

3.7 Replacement Lenders . If a Lender (i) has notified Unit and the Administrative Agent of the circumstances described in Sections 3.1 or 3.4, (ii) has required Borrowers to make payments for Indemnified Taxes or Other Taxes under Section 3.3, (iii) becomes a Defaulting Lender, (iv) is a Non-Extending Lender under Section 3.8, or (v) objects to an increase in the Borrowing Base proposed by the Administrative Agent under the provisions of Section 2.6.2, then Unit may, at its sole cost, expense and effort, within ninety (90) days of Unit’s learning of any of the items in (i) – (v) provided that no Event of Default then exists, terminate, in whole but not in part, the Commitment of that Lender (other than the Administrative Agent) (a “ Terminated Lender “), on ten (10) days’ prior written notice to the Terminated Lender and the Administrative Agent (a “ Notice of Termination “) of Unit's decision under this Section 3.7. If, at any time during the ninety day period and before Unit issues a Notice of Termination, the Terminated Lender notifies Unit in writing that the circumstances giving rise to the notice, event or circumstance no longer apply or the Terminated Lender otherwise withdraws its request for additional compensation or approves the proposed Borrowing Base increase tendered by the Administrative Agent, as the case may be, then Unit will no longer be permitted to terminate the Commitment of that Lender by reason of the particular circumstances that no longer apply, the request that was withdrawn or the Borrowing Base increase that was approved, as the case may be.

To effect the termination of the Commitment of the Terminated Lender, Unit will: obtain either or both (i) an agreement by one or more Lenders to increase their Commitment or Commitments or (ii) an agreement by one or more other banking or lending institutions to become parties to this Agreement in place and instead of Terminated Lender and agree to accept a Commitment or Commitments; provided, however, that the new banking or lending institutions are reasonably acceptable to the Administrative Agent and become parties by executing an Assignment (the Lenders or other banking institutions that agree to accept in whole or in part the Commitment of the Terminated Lender being referred to herein as the “ Replacement Lenders “) without recourse from the Terminated Lender, and that the aggregate increased and/or accepted Commitments of the Replacement Lenders under clauses (i) and (ii) above equal the Commitment of the Terminated Lender.

The Notice of Termination shall include the name of the Terminated Lender, the date the termination will occur (the “ Lender Termination Date “), and within twenty (20) days of the Notice of Termination, Unit shall designate in writing the Replacement Lender or Replacement Lenders to which the Terminated Lender will assign its Commitment and, if there will be more than one Replacement Lender, the portion of the Terminated Lender’s Commitment to be assigned to each Replacement Lender.

On the Lender Termination Date, (i) the Terminated Lender shall by execution and delivery of an Assignment assign, without recourse, its Commitment and all of its interests, rights and obligations under this Agreement and the related Loan Documents to the Replacement Lender or Replacement Lenders (pro rata, if there is more than one Replacement Lender, in proportion to the Pro Rata Share of the Terminated Lender’s Commitment to be assigned to each Replacement Lender) indicated in the Notice of Termination and shall assign to the Replacement Lender or Replacement Lenders each of its Loans (if any) then outstanding and participation interests in Letters of Credit (if any) then outstanding pro rata as aforesaid), (ii) the Terminated Lender shall endorse its Note, if any, payable without recourse, representation or warranty to the order of the Replacement Lender or Replacement Lenders (Pro Rata Share as aforesaid), (iii) the Replacement Lender or Replacement Lenders shall purchase the Note, if any, or Commitment held by the Terminated Lender (pro rata as aforesaid) at a price equal to the unpaid principal amount (including its participation in and Pro Rata Share of the LC Exposure) plus interest, facility fees, Commitment Fee and other fees accrued and unpaid to the Lender Termination Date, and (iv) the Replacement Lender or Replacement Lenders will thereon (pro rata as aforesaid) succeed to and be substituted in all respects for the Terminated Lender with like effect as if becoming a Lender under the terms of Section 14.3, and the Terminated Lender will have the rights and benefits of an assignor under Section 14.3. To the extent not in conflict, the terms of Section 14.3 shall supplement the provisions of this Section 3.7. For each assignment made under this Section 3.7, the Replacement Lender shall pay to the Agent the processing fee provided for in Section 14.3. The Borrower will be responsible for the concurrent payment of any breakage costs associated with termination and Replacement Lenders, as set forth in Section 3.5.

3.8 Extension of Maturity Date . .

3.8.1. Requests for Extension . Unit may, by notice to the Administrative Agent (who shall promptly notify the Lenders) not earlier than eighteen (18) months and not later than twelve (12) months before the stated Facility Termination Date then in effect (the “Existing Maturity Date”), request that each Lender extend the Lender’s Facility Termination Date for an additional one (1) year period from the Existing Maturity Date; but the Borrowers may request only two extensions under this Agreement and Borrowers will pay at the closing of an extension a reasonable extension fee, the amount of which will be negotiated and agreed to by the Lenders and Unit.

3.8.2. Lender Elections to Extend . Each Lender, acting in its sole and individual discretion, shall, by notice to the Administrative Agent given not later than the date (the “ Notice Date ”) that is sixty (60) days after Unit has given notice in accordance with Section 3.8.1, advise the Administrative Agent whether or not the Lender agrees to the extension (and each Lender that determines not to so extend its Facility Termination Date (a “ Non-Extending Lender ”) and shall notify the Administrative Agent of that fact promptly after that determination (but in any event no later than the Notice Date) and any Lender that does not so advise the Administrative Agent on or before the Notice Date shall be deemed to be a Non-Extending Lender. The election of any Lender to agree to the extension shall not obligate any other Lender to so agree.

3.8.3. Notification by Administrative Agent . The Administrative Agent shall notify the Borrower of each Lender’s determination under this Section no later than the date seven (7) days after the Notice Date (or, if the date is not a Business Day, on the next succeeding Business Day).

3.8.4. Additional Commitment Lenders . The Borrowers shall have the right on or before the Existing Maturity Date to replace each Non-Extending Lender with, and add as “Lenders” under this Agreement one or more Replacement Lenders (each, an “ Additional Commitment Lender “) as provided in Section 3.7, each of which Additional Commitment Lenders shall have entered into an Assignment and Assumption under which the Additional Commitment Lender shall, effective as of the Existing Maturity Date, undertake a Commitment (and, if any Additional Commitment Lender is already a Lender, its Commitment will be in addition to the Lender’s Commitment on that date).

3.8.5. Minimum Extension Requirement . Only if the total of the Commitments of the Lenders that have agreed to extend their Facility Termination Date and the additional Commitments of the Additional Commitment Lenders is more than 50% of the total amount of the Commitments in effect immediately before the Existing Maturity Date, then, effective as of the Existing Maturity Date, the Facility Termination Date of each Lender (other than each Non-Extending Lender) and of each Additional Commitment Lender will be extended to the date which is one year after the Existing Maturity Date. If that date is not a Business Day, then the Facility Termination Date as extended will be the next preceding Business Day. Each Additional Commitment Lender will as a result become a “Lender” for all purposes of this Agreement.

3.8.6. Conditions to Effectiveness of Extensions . Notwithstanding the above provisions of this Section, the extension of the Facility Termination Date will not be effective with respect to any Lender unless:

(i)	no Default, Event of Default or Deficiency has occurred and is continuing on the date of the extension and after giving effect to the extension;

(ii)

the representations and warranties contained in this Agreement are true and correct on and as of the date of the extension and after giving effect to the extension, as though made on and as of that date (or, if any representation or warranty is expressly stated to have been made as of a specific date, as of that specific date); and

(iii)

on the Facility Termination Date of each Non-Extending Lender, the Borrower prepays any Obligations (other than any Rate Management Obligations owed to such Non-Extending Lender) outstanding on that date to each Non-Extending Lender (and pays any additional amounts required under Section 3.5).

3.8.7. Conflicting Provisions . This Section 3.8 will supersede any conflicting provisions in Section 11.2.

ARTICLE 4

CONDITIONS PRECEDENT

4.1 Credit Extension . The Lenders will not be required to make any initial Credit Extension unless:

4.1.1. Unit has furnished to the Administrative Agent at its main banking offices in Tulsa, Oklahoma, each of the following, duly executed by the applicable Credit Parties and delivered in form, substance and date satisfactory to the Administrative Agent, with sufficient copies for all of the Lenders:

(i)

copies of the certificate of incorporation or certificate of organization or formation, as applicable, of each of the Credit Parties, together with all amendments, and a certificate of good standing, each certified by the appropriate governmental officer in their respective jurisdiction of organization;

(ii)

copies, certified by the Secretary or Assistant Secretary of the Credit Parties, of their respective by-laws or operating agreement or regulations, as applicable, and of their respective Board of Directors’ or members/managers’ resolutions and of resolutions or actions of any other body authorizing the authentication of the Loan Documents to which each Borrower is a party,

(iii)

an incumbency certificate, executed by the Secretary or Assistant Secretary of the Credit Parties, identifying by name and title and bearing the signatures of the Authorized Officers and any other officers of the Credit Parties authorized to execute the Loan Documents to which the Credit Party is a party, with the Administrative Agent and the Lenders being entitled to rely on the certificate until informed of any change in writing by the Credit Party,

(iv)

a certificate, executed by the chief financial officer of Unit (on behalf of all of the Credit Parties), stating that on the initial Credit Extension Date no Default, Event of Default or Deficiency has occurred and is continuing, that all representations and warranties in the Loan Documents are true and correct in all material requests as of the Initial Credit Extension Date (except to the extent a representation or warranty is stated to relate solely to an earlier date, in which case the representation or warranty will have been true and correct on and as of such earlier date) and that no Material Adverse Effect has occurred;

(v)

a favorable written closing opinion of counsel to the Borrowers (in the event Borrowers use an outside counsel then that counsel will be acceptable to the Administrative Agent), addressed to the Administrative Agent and the Lenders in form, scope and substance satisfactory to the Administrative Agent;

(vi)	this Agreement and a Note payable to the order of each Lender requesting the issuance thereof;

(vii)

arrangements satisfactory to the Administrative Agent and the LC Issuer concerning payment in full of any Indebtedness owing to the Existing Lenders under the Existing Credit Agreement;

(viii)

any other documents, certificates, instruments and information as any Lender or its counsel may have reasonably requested and satisfactory review by the Lenders of all environmental, litigation, insurance (including in compliance with Sections 5.20 and 6.6) and other matters deemed appropriate by the Administrative Agent, including without limitation, data sufficient for analysis and projection of the Superior Cash Flow and the Oil and Gas Properties portion of the Borrowing Base Property (division orders, production payment checks or other evidence of payment by the purchaser of production) as reasonably deemed necessary by the Administrative Agent or the Required Lenders; and

(ix)

all facility fees owed to the Lenders and all fees and expenses owed by Borrowers to Administrative Agent that have been billed and submitted to the Administrative Agent and Unit as of that date including the reasonable attorney’s fees and expenses of legal counsel for the Administrative Agent will have been paid.

4.1.2 The Administrative Agent will (i) attempt to promptly obtain the surrender to of and deliver to Unit all of the promissory notes held by the Existing Lenders under the Existing Credit Agreement and .(ii) notify Unit and the Lenders of the date that the initial Credit Extension was made.

4.2 Each Credit Extension . The Lenders are not required to make a Credit Extension unless on the applicable Credit Extension Date:

(i)

at the time of and immediately after giving effect to such Credit Extension, there exists no Default, Event of Default or Deficiency and the representations and warranties contained in Article 5 are then true and correct in all material respects as of the Credit Extension Date (except to the extent a representation or warranty is stated to relate solely to an earlier date, in which case the representation or warranty will have been true and correct on and as of the earlier date);

(ii)	the making of the Loan or the issuance, amendment, renewal or extension of such LC, as applicable, would not conflict with, or cause any Lender or the LC Issuer to violate or exceed, any applicable governmental requirement, and no Change shall have occurred;

(iii)

the Credit Parties are, on a consolidated basis, solvent; and

(iv)

the Administrative Agent has received all documents and instruments it has then reasonably requested (in addition to those described in Section 4.1) as to (i) the accuracy and validity of or compliance with all representations, warranties, and covenants made by any Borrower or Subsidiary Guarantor in this Agreement in all material respects and the other Loan Documents, in each case in all material respects, and (ii) the satisfaction of all applicable conditions contained in this Agreement.

Each Borrowing Notice or request for issuance of an LC will constitute a representation and warranty by the Borrowers that the applicable conditions contained in Section 4.2 have been satisfied or will be satisfied by the applicable Credit Extension Date.

ARTICLE 5

REPRESENTATIONS AND WARRANTIES

The Credit Parties represent and warrant to the Lenders that as of the date of this Agreement:

5.1 Existence and Good Standing . Each Credit Party is a corporation or limited liability company, duly and properly incorporated or organized, as the case may be, validly existing and (to the extent applicable to such entity) in good standing under the laws of its jurisdiction of incorporation or organization and has all requisite authority to carry on its business in each jurisdiction as now conducted.

5.2 Authorization and Validity . Each Credit Party has the power and authority and legal right to execute and deliver the Loan Documents to which it is a party and to perform its obligations thereunder. The authentication and delivery by each Credit Party of the Loan Documents to which it is a party and the performance of its obligations thereunder have been duly authorized by proper corporate or limited liability company proceedings. The Loan Documents to which a Credit Party is a party constitute legal, valid and binding obligations of that Credit Party enforceable against it in accordance with their terms, except as may be limited by bankruptcy, insolvency, or similar laws affecting the enforcement of creditors’ rights generally and general principles of equity (“ Enforceability Exceptions ”).

5.3 No Conflict; Government Consent . Neither the authentication and delivery of the Loan Documents by any of the Credit Parties which is a party to those documents, nor the consummation of the transactions contemplated by the Loan Documents, nor compliance with the provisions of the Loan Documents will violate in any material respect (i) any law, rule, regulation, order, writ, judgment, injunction, decree or award binding on the Credit Parties, (ii) any of the Credit Parties’ articles or certificate of incorporation, partnership agreement, certificate of partnership, articles or certificate of organization, by-laws, or operating or other management agreement, as the case may be, or (iii) the provisions of any indenture, instrument or agreement to which any of the Credit Parties is a party or is subject, or by which it, or its Property, is bound, or conflict with or constitute a default, or result in, or require, the creation or imposition of any Lien in, of, or on the Property of the Credit Parties under the terms of any such indenture, instrument or agreement. No order, consent, adjudication, approval, license, authorization, or validation of, or filing, recording or registration with, or exemption by, or other action in respect of any governmental or public body or authority, or any subdivision thereof, which has not been obtained by the applicable Credit Parties, and the failure of which to obtain could reasonably be expected to have a Material Adverse Effect is required to be obtained by the Credit Parties in connection with the authentication and delivery of the Loan Documents, the borrowings under this Agreement, the payment and performance by the Borrowers of the Obligations or the legality, validity, binding effect or enforceability of any of the Loan Documents.

5.4 Financial Statements . The audited annual and unaudited quarterly, consolidated financial statements of Unit and its consolidated Subsidiaries previously delivered to the Lenders were prepared in accordance with GAAP (except that the unaudited interim financial statements were subject to normal and recurring year-end adjustments) in effect on the date the statements were prepared and fairly present, in all material respects, the consolidated financial position and consolidated results of operations and cash flows of Unit and its consolidated subsidiaries at that date and the consolidated results of their operations for the period then ended.

5.5 Material Adverse Effect . Since June 30, 2011, there has been no change in the business, Property, prospects, condition (financial or otherwise) or results of operations of the Credit Parties which could reasonably be expected to have a Material Adverse Effect. There is no fact known to the Borrowers which has a Material Adverse Effect or in the future is reasonably likely to have (so far as the Credit Parties can now foresee) a Material Adverse Effect and which has not been set forth in this Agreement or the other documents, certificates and statements furnished to the Administrative Agent by or on behalf of the Credit Parties before, or on, the date of this Agreement.

5.6 Taxes . The Credit Parties have filed all United States federal Tax returns and all other material Tax returns which are required to be filed and have paid all Taxes due under those returns or under any assessment received by the Credit Parties or any of their Subsidiaries, except (i) Taxes, if any, that are being contested in good faith and as to which adequate reserves have been provided in accordance with GAAP, and (ii) other Taxes where the failure to file or the failure to timely pay could not reasonably be expected to have a Material Adverse Effect. No material tax Liens have been filed and no material claims are being asserted with respect to any Taxes.

5.7 Litigation and Contingent Obligations . There is no litigation, arbitration, governmental investigation, proceeding or inquiry pending or, to the knowledge of any of their officers, threatened against or affecting the Credit Parties which could reasonably be expected to have a Material Adverse Effect or which seeks to prevent, enjoin or delay the making of any Credit Extensions. Other than any liability incident to any litigation, arbitration or proceeding which could not reasonably be expected to have a Material Adverse Effect, the Credit Parties have no material Contingent Obligations not provided for or disclosed in the financial statements referred to in Section 5.4 except as set forth on Schedule 7 of this Agreement.

5.8 Subsidiaries . The Disclosure Schedule contains an accurate list of all Subsidiaries of Unit as of the date of this Agreement, setting forth their respective jurisdictions of organization and the percentage of their respective capital stock or other ownership interests owned by the Unit or the other Credit Parties. All of the issued and outstanding shares of capital stock or other ownership interests of the Subsidiaries have been (to the extent those concepts are relevant with respect to those ownership interests) duly authorized and issued and are fully paid and non-assessable.

5.9 ERISA . Neither the Credit Parties nor any other member of the Controlled Group has incurred, or is reasonably expected to incur, any Withdrawal Liability to Multiemployer Plans which could reasonably be expected to have a Material Adverse Effect. Each Plan complies in all material respects with all applicable requirements of law and regulations (ii), no Reportable Event has occurred with respect to any Plan, (iii) neither the Credit Parties nor any other member of the Controlled Group has withdrawn from any Plan or initiated steps to do so, and (iv) no steps have been taken to reorganize or terminate any Plan, except as disclosed in the Disclosure Schedule.

5.10 Accuracy of Information . No information, exhibit or report furnished by the Credit Parties to the Administrative Agent or to any Lender in connection with the negotiation of, or compliance with, the Loan Documents contained any material misstatement of fact or omitted to state a material fact or any fact necessary to make the statements contained therein not misleading, in each case as of the date furnished and when taking all such information, exhibits and reports as a whole; provided, that, with respect to projected financial information, the Borrowers represent only that such information was prepared in good faith based on assumptions believed by Borrowers to be reasonable both at the time made and as of the effective date of this Agreement.

5.11 Margin Stock . No part of the Loan proceeds of any Advances will be used to purchase or carry any margin stock or to extend credit to others for the purpose of purchasing or carrying margin stock. If requested by the Administrative Agent or the Required Lenders, the Credit Parties will furnish to the Administrative Agent a statement in conformity with the requirements of Federal Reserve Form U-1, referred to in Regulation U, to the foregoing effect. No indebtedness being reduced or retired out of the proceeds of the Advances was or will be incurred for the purpose of purchasing or carrying any margin stock within the meaning of Regulation U or any “margin security” within the meaning of Regulation T. “Margin Stock” within the meaning of Regulation U does not constitute more than 25% of the value of the consolidated assets of Unit and its Subsidiaries.

5.12 Material Agreements; Default . Unit has no actual knowledge of (i) any material agreement or material instrument to which any Credit Party is a party or (ii) any charter or other corporate restriction, either of which (i) or (ii), under current conditions and circumstances known to Unit, constitutes or could reasonably be expected to have a Material Adverse Effect. No Credit Party is in default in the performance, observance or fulfillment of any of the obligations, covenants or conditions contained in (i) any agreement to which it is a party, which default could reasonably be expected to have a Material Adverse Effect or (ii) any agreement or instrument evidencing or governing Indebtedness, which default could reasonably be expected to have a Material Adverse Effect. No Default exists.

5.13 Compliance With Laws . The Credit Parties have complied with all applicable statutes, rules, regulations, orders and restrictions of any domestic or foreign government or any instrumentality or agency thereof having jurisdiction over the conduct of their respective businesses or the ownership of their respective Property except for any failure to comply with any of the foregoing which could not reasonably be expected to have a Material Adverse Effect.

5.14 Ownership of Properties . Each of the Credit Parties and their respective Subsidiaries has marketable title to all of the properties and assets reflected as owned in the consolidated financial statements of Unit, in each case free and clear of all Liens other than Permitted Encumbrances and all other Liens or title defects as do not materially and adversely affect the value of the property for, and do not materially interfere with the use made or proposed to be made of such property by Unit or its Subsidiaries, which such other Liens or title defects do not exceed $2,000,000 in total. The real property, improvements, equipment and personal property held under lease by the Credit Parties are held under valid enforceable leases, except for Permitted Encumbrances, and all other Liens or title defects as are not material and do not materially interfere with the use made or proposed to be made of the real property, improvements, equipment, or personal property by the Credit Parties. The Credit Parties possess all licenses, permits, franchises, patents, copyrights, trademarks and trade names, and other intellectual property (or otherwise possess the right to use the intellectual property without violation of the rights of any other Person) which are necessary to carry out their business as presently conducted and as proposed to be conducted hereafter, except to the extent that the failure to have such rights would not have or be reasonably expected to have a Material Adverse Effect.

5.15 Plan Assets; Prohibited Transactions . Neither the signing of this Agreement nor the making of Loans gives rise to a prohibited transaction within the meaning of Section 406 of ERISA or Section 4975 of the Code. During the last ten (10) years, no Reportable Event has occurred with respect to any Plan that has not been timely cured with any Lien imposed as a result thereof fully released of record. The Credit Parties have (i) fulfilled all their obligations under the funding standards of ERISA and the Code and (ii) are in compliance in all material respects with the applicable ERISA and Code provisions with respect to each Plan. During the last ten (10) years, there have not been any nor are there now existing any events or conditions that would permit any Plan to be terminated under circumstances which would cause the lien provided under Section 4068 of ERISA to attach to the assets of the Credit Parties or any of the Subsidiary Guarantors. No Credit Party has (i) sought any waiver of the minimum funding standard under Section 412 of the Code, (ii) failed to make any contribution or payment to any Plan, or made any amendment to any Plan, which has resulted or could reasonably be expected to result in the imposition of a Lien or the posting of a bond or other security under ERISA or the Code, or (iii) incurred any liability under Title IV of ERISA.

5.16 Environmental Matters . Except as set forth on Schedule 4:

(i)

To the best of the Credit Parties’ knowledge and belief after diligent inquiry, each Property owned, leased or operated by the Credit Parties do not contain, and during their period of ownership, lease or operation of such Property, have not previously contained, any Materials of Environmental Concern which are currently a concern, in amounts or concentrations which (i) currently constitute or constituted a violation of, or (ii) under current law could give rise to liability under, any Environmental Law, except in either case insofar as the violation or liability, individually or collectively, is not reasonably likely to result in a Material Adverse Effect.

(ii)

To the best of the Credit Parties’ knowledge and belief after diligent inquiry, each Property and all their operations at such Property are in compliance in all material respects, and have, for the lesser of the last five years or for the duration of, their ownership, lease, or operation by the Credit Parties, been in compliance in all material respects with all applicable Environmental Laws, and there is no current contamination by Materials of Environmental Concern at, under or about such Property or violation of any Environmental Law with respect to such Property or the business operated by the Credit Parties or any of their Subsidiaries (collectively, the “ Business “) which either has not been remediated (or is not in the process of being remediated) or could materially interfere with the continued operation of the Properties or materially impair the fair saleable value thereof.

(iii)

None of the Credit Parties has received any written notice of violation, alleged violation, non-compliance, liability or potential liability regarding environmental matters or compliance with applicable Environmental Laws with regard to any Property or the Business, except in all cases insofar as the notice individually or collectively, does not involve a matter or matters that is or are reasonably likely to result in a Material Adverse Effect.

(iv)

To the best of the Credit Parties’ knowledge and belief, Materials of Environmental Concern have not been transported or disposed of from any Property in violation of, or in a manner or to a location which could give rise to liability under, any Environmental Law, nor have any Materials of Environmental Concern been generated, treated, stored or disposed of at, on or under any Property in violation of, or in a manner that could give rise to liability under, any applicable Environmental Law except in each case insofar as any violation or liability referred to in this subsection, individually or collectively, is not reasonably likely to result in a Material Adverse Effect.

(v)

No judicial proceeding or governmental or administrative action is pending or, to the knowledge of the Credit Parties, threatened, under any Environmental Law to which the Credit Parties are or will be named as a party with respect to each Property or the Business, nor are there any consent decrees or other decrees, consent orders, administrative orders or other orders, or other administrative or judicial requirements outstanding under any Environmental Law with respect to each Property or the Business, except in each case insofar as those proceeding, action, decree, order or other requirement, individually or collectively, is not reasonably likely to result in a Material Adverse Effect.

(vi)

To the best of the Credit Parties’ knowledge and belief after diligent inquiry, there has been no release or, to the best of Credit Parties knowledge and belief, threat of release of Materials of Environmental Concern at or from any Property, or arising from or related to the operations of the Borrower in connection with any Property or otherwise in connection with the Business, in violation of or in amounts or in a manner that could give rise to liability under Environmental Laws, except in each case insofar as any violation or liability referred to in this subsection, individually or collectively, is not reasonably likely to result in a Material Adverse Effect.

5.17 Names and Places of Business . No Credit Party has, during the preceding five years, had, been known by, or used any other trade or fictitious name. The chief executive office and principal place of business of each Credit Party are located at the address of the Credit Parties specified in Section 15.1.

5.18 Possession of Franchises, Licenses . The Credit Parties have in their possession, or have timely applied for, all franchises, certificates, licenses, permits and other authorizations from governmental political subdivisions or regulatory authorities, that are necessary in any material respect for the ownership, maintenance and operation of each Property, and none of the Credit Parties is in violation of any thereof in any material respect.

5.19 Rate Management Transactions . As of the date of this Agreement, Schedule 5 sets forth a true and complete list of all current Rate Management Transactions (including contracts of sale which provide for prepayment for deferred shipment or delivery of oil, gas or other commodities) of the Credit Parties and their counterparties.

5.20 Insurance . The insurance certificate provided under Section 4.1(viii) contains an accurate and complete description of all material policies of fire, liability, workmen’s compensation and other forms of insurance owned or held by the Credit Parties. All such policies are in full force and effect, all premiums with respect thereto covering all periods up to and including the date of this Agreement have been paid, and no notice of cancellation or termination has been received with respect to any such policy. Such policies are sufficient for compliance with all applicable requirements of law and of all agreements to which any Credit Party is a party; are valid, outstanding and enforceable (subject to Enforceability Exceptions) policies; Borrowers will take no action to terminate the policies earlier than the respective dates set forth in such insurance certificate; and will not in any way be affected by, or terminate or lapse by reason of, the transactions contemplated by this Agreement. Except as disclosed by Unit in writing to the Administrative Agent, none of the Credit Parties have been refused any insurance with respect to its material assets or operations, nor has its coverage for its material assets been limited below usual and customary policy limits, by an insurance carrier to which it has applied for any such insurance or with which it has carried insurance during the last three years.

5.21 Solvency . The Borrowers and their Subsidiaries (and with respect to their Subsidiaries, after taking into account each Subsidiary's rights of contribution), on a consolidated basis, are not insolvent, the Borrowers' and its Subsidiaries' assets (and with respect to their Subsidiaries, after taking into account each Subsidiary's rights of contribution), on a consolidated basis, exceed their liabilities, and neither the Borrowers nor any of their Subsidiaries (and with respect to their Subsidiaries, after taking into account each Subsidiary's rights of contribution) will be rendered insolvent by the execution and performance of this Agreement and the Loan Documents.

ARTICLE 6

AFFIRMATIVE COVENANTS

During the term of this Agreement, unless the Required Lenders will otherwise consent in writing:

6.1 Reports . Unit will maintain and furnish to the Administrative Agent:

(i)

Within 80 days after the close of each of its fiscal years, the financial statements of Unit and its Consolidated Subsidiaries, together with an unqualified audit report certified by Unit’s independent certified public accountants, prepared in accordance with GAAP on a consolidated basis, including a balance sheet as of the end of such period and statements of operations, stockholders equity and cash flows for such period;

(ii)

Within 45 days after the close of the first three quarterly periods of each of its fiscal years, consolidated unaudited balance sheets as at the close of each such period and statements of operations, stockholders equity and cash flows for the period from the beginning of such fiscal year to the end of such quarter, all certified by its chief financial officer;

(iii)

Together with the financial statements required under Sections 6.1(i) and (ii), (a) copies of all certifications made by officers of Unit to the SEC in connection with such financial statements, (b) a compliance certificate substantially in the form of Exhibit B executed by Unit’s chief financial officer showing the calculations necessary to determine compliance with this Agreement and stating that no Default or Event of Default exists, or if any Default or Event of Default exists, stating the nature and status of that Default or Event of Default, and (c) a summary of Rate Management Transactions (itemized by term or duration of hedge (i. e. itemized by each calendar year) categorized by oil, gas and ngl; to which any Credit Party is a party on such date;

(iv)

As soon as practicable and in any event within 10 days after the Credit Parties know that a Reportable Event has occurred with respect to any Plan, a statement, executed by the chief financial officer of Unit, describing the Reportable Event and a summary of the action which the Credit Parties propose to take or have taken regarding the Reportable Event and prompt written notice of the amendment, modification or termination of any Rate Management Agreement or the termination of any Rate Management Transaction;

(v)

As soon as practicable and in any event within 10 days after receipt by the Credit Parties, a copy of (a) any notice or claim to the effect that the Credit Parties is or may be liable to any Person as a result of the release by the Credit Parties, or any other Person of any toxic or hazardous waste or substance into the environment, and (b) any notice alleging any violation of any federal, state or local environmental, health or safety law or regulation by the Credit Parties, which, in either case, could reasonably be expected to have a Material Adverse Effect;

(vi)	To the extent not publicly filed with the SEC, copies of all financial statements, reports and proxy statements so furnished to Unit’s stockholders;

(vii)

By March 1 of each year (commencing March 1, 2012), an Engineering Report prepared as of the prior December 31, by petroleum engineers who are employees of Credit Parties and audited by Ryder Scott Company, or any other firm of independent petroleum engineers chosen by Unit and reasonably acceptable to the Administrative Agent. The reserve report will pertain to all Oil and Gas Properties and interests owned by any Credit Parties and their Subsidiaries located in the United States and which have attributable to them proved oil or gas reserves. The reserve audit described above will encompass a review of the reserves associated with Oil and Gas Properties comprising at least 80% of the value stated in the report. The report will be satisfactory to Administrative Agent, will contain sufficient information to enable Credit Parties to meet the reporting requirements concerning oil and gas reserves contained in Regulations S-K and S-X promulgated by the SEC, will take into account any “over/under produced” status under gas balancing arrangements, and will contain information and analysis comparable in scope (subject to changes necessary to comply with future laws); to that contained in the Engineering Report previously furnished to the Administrative Agent;

(viii)

By September 1 of each year (commencing September 1, 2012), and promptly following notice of a Special Redetermination under Section 2.6, an Engineering Report prepared as of the preceding June 30 (or the last day of the prior calendar month in the case of an additional redetermination) by petroleum engineers who are employees of Credit Parties, together with an accompanying report on property sales, property purchases and changes in categories, both in the same form and scope as the reports in (vii) above;

(ix)

By March 1st and September 1st of each year, beginning March 1, 2012, a report describing the gross volume of production and sales attributable to production during the prior six-month period from the properties described in the Engineering Report in Section 6.1(vii) or Section 6.1(viii) and describing the related severance taxes, other taxes, and leasehold operating expenses. By each March 1st and September 1st of each year, beginning March 1, 2012, the following internally prepared and generated information and data concerning Superior and the Superior Cash Flow: (i) most recent three (3) year historical volumes gathered and processed of Superior, on the one hand, and third Persons, on the other hand, and cash flows, (ii) summary of material contracts and calculation of third party payments (i. e., processing fees, keepwhole or percentage of proceeds contracts) and (iii) budget for its current fiscal year, each in form, scope and substance reasonably acceptable to the Administrative Agent including such accurate volume information as necessary for review and confirmation by the Banks' engineers; and

(x)	Any other information (including non-financial information) as the Administrative Agent or any Lender may from time to time reasonably request.

6.2 Use of Proceeds . Credit Extension proceeds will be used, as necessary, (i) to arrange for the refinancing of any Existing Indebtedness and the commitments issued in the Existing Credit Agreement, (ii) to provide financing for general working capital requirements for (a) exploration, development, production and acquisition of Oil and Gas Properties, (b) acquisitions and operation of midstream assets, (c) issuance of standby Letters of Credit and, (d) contract drilling services, and (iii) for general corporate purposes of the Borrowers.

6.3 Notice of Default . Unit will give prompt notice in writing to the Lenders of the occurrence of any Default known to it and of any other development, financial or otherwise, known to it which could reasonably be expected to have a Material Adverse Effect.

6.4 Conduct of Business . Except as otherwise permitted under Section 7.3, the Credit Parties will conduct their respective business in substantially the same manner and in substantially the same fields of enterprise as it is presently conducted and do all things necessary to remain duly incorporated or organized, validly existing and (to the extent the concept applies to the entity) in good standing as a domestic corporation, partnership or limited liability company in its jurisdiction of incorporation or organization, as the case may be, and maintain all requisite authority to conduct its business in each jurisdiction in which its business is conducted, except only where the failure to so qualify could not reasonably be expected to have or result in a Material Adverse Effect.

6.5 Taxes . The Credit Parties will, timely file complete and correct United States federal and applicable foreign, state and local Tax returns required by law and pay, when due, all Taxes on it or its income, profits or Property, except any material Taxes which are being contested in good faith by appropriate proceedings and with respect to which adequate reserves have been provided in accordance with GAAP.

6.6 Insurance . The Credit Parties will, maintain with, to the best of Unit’s knowledge and belief, financially sound and reputable insurance companies insurance on their Property in amounts and covering those risks consistent with their prior reasonable and prudent business practices. On or prior to the initial Credit Extension and thereafter on reasonable written request from the Administrative Agent, Unit will furnish to any Lender information as to the insurance carried.

6.7 Compliance With Laws . The Credit Parties will, comply, in all material respects, with all laws, rules, regulations, orders, writs, judgments, injunctions, decrees or awards to which it may be subject including, without limitation, all Environmental Laws.

6.8 Maintenance of Properties . The Credit Parties will do all things reasonably necessary, consistent with their prior prudent practices, to maintain, preserve, protect and keep their respective Property in good repair, working order and condition, ordinary wear and tear excepted and make all necessary and proper repairs, renewals and replacements so that its business carried on in connection with those Properties may be conducted consistent with the Credit Parties’ prior customary business practices.

6.9 Inspection . The Credit Parties will permit the Administrative Agent and the Lenders, by their respective representatives, to inspect any of the Property, books and financial records of the Credit Parties, exclusive of records subject in good faith to attorney work product or privileged communications rules and standards, to examine and make copies of the books of accounts and other financial records of the Credit Parties, and to discuss the affairs, finances and accounts of the Credit Parties with, and to be advised as to the same by, their respective officers at such reasonable times and intervals as the Administrative Agent or any Lender may designate. Any inspection by a Lender of the Property of the Credit Parties will be at the sole risk and liability of such Lender.

ARTICLE 7

NEGATIVE COVENANTS

During the term of this Agreement, unless the Required Lenders will otherwise consent in writing:

7.1 Dividends . The Borrowers will not, nor will they permit any other Credit Party to, declare or pay any dividends or make any distributions on its capital stock (other than dividends payable in their own capital stock) or redeem, repurchase or otherwise acquire or retire any of its capital stock at any time outstanding, including within the scope of such prohibition, any such dividends or distributions of whatever kind or type, contemplated above to any Existing Subordinated Note Indenture Additional Parties; provided, however, if (a) no Default, Event of Default or Deficiency has occurred and continues in effect or remains uncured or will result from or be caused by such dividend or distribution, and (b) Unit is in compliance with the limitations of Section 3.04 of the Existing Subordinated Notes Indenture and such dividend, distribution, redemption, repurchase or other acquisition or retirement of capital stock, together with other Restricted Payments (as that term is defined in the Existing Subordinated Notes Indenture) does not cause or result in a breach of Section 3.04 of the Existing Subordinated Notes Indenture, (i) any Subsidiary may declare and pay dividends or make distributions to, or redeem, purchase or otherwise acquire or retire any of its capital stock from, Unit or any Subsidiary (other than and expressly excluding the Existing Subordinated Note Indenture Additional Parties), so long as such Subsidiary is not a Wholly-Owned Subsidiary, if the dividend, distribution, redemption, purchase, acquisition or retirement, as the case may be, is made on a pro rata basis (or with respect to Unit or its Subsidiaries, better than a pro rata basis), (ii) during any fiscal year Unit may pay cash dividends in amounts not exceeding thirty (30%) of its Consolidated Net Income (after taxes) for the preceding fiscal year, (iii) Unit may make any purchases of its outstanding common stock under a stock repurchase program approved by the Unit Board of Directors and conducted in compliance with the applicable rules and regulations of the SEC, and (iv) Unit may declare and pay dividends with respect to its capital stock payable solely in additional shares of its capital stock (other than Disqualified Stock as that term is defined in the Existing Subordinated Notes Indenture).

7.2 Indebtedness . The Borrowers will not, nor will they permit any Subsidiary to, create, incur or suffer to exist any Indebtedness, except:

(i)	The Loans and the Reimbursement Obligations;

(ii)	Indebtedness (including Contingent Obligations) existing on the date hereof and described in the Disclosure Schedule;

(iii)

Indebtedness arising under Financial Contracts permitted by Section 7.9;

(iv)	Contingent Obligations permitted by Section 7.8;

(v)

non-recourse Indebtedness in a restricted or special purpose Subsidiary (for which consent of the Required Lenders must be obtained) and as to which none of the Credit Parties (i) provides any guaranty or credit support of any kind (including any undertaking, guarantee, indemnity, agreement or instrument that would constitute Indebtedness) or (ii) is directly or indirectly liable (as a guarantor or otherwise); provided, that after giving effect to such Indebtedness outstanding from time to time, the Credit Parties are not in violation of any of the financial covenants of Article 8;

(vi)

normal and ordinary course trade Indebtedness and customary obligations relating to the operation of oil and gas producing properties, drilling rigs and gathering and processing systems and midstream asset operations which are not greater than 90 days past invoice or delinquent or which are being contested in good faith by appropriate action and for which adequate reserves have been maintained in accordance with GAAP;

(vii)

unsecured senior indebtedness not in excess of $20,000,000 in total;

(viii)

lease obligations (including building and office leases and leases for equipment) not in excess of $40,000,000 in total;

(ix)

(a) the Existing Subordinated Notes and (b) other subordinated Indebtedness (including subordinated Indebtedness convertible to equity) provided that (i) the aggregate principal amount of all such existing and other future subordinated Indebtedness outstanding at any time shall not exceed $600,000,000; (ii) at the time of incurring such subordinated Indebtedness (A) no Default, Event of Default or Deficiency has occurred and is then continuing and (B) no Default, Event of Default or Deficiency would result from the incurrence of any such subordinated Indebtedness after giving effect to the incurrence of such Indebtedness (and any concurrent repayment of Indebtedness with the proceeds of such incurrence), (iii) no subordinated Indebtedness has any scheduled amortization prior to six (6) months after the Facility Termination Date; (iv) no subordinated Indebtedness matures sooner than six (6) months after the Facility Termination Date; (v) the other material terms of all such subordinated Indebtedness are not generally more restrictive, taken as a whole, than the terms of this Agreement and the other Loan Documents or the Existing Subordinated Notes; and (vi) the Borrowing Base is adjusted as contemplated by Section 2.6.8 and the Borrowers make any prepayment required under Section 2.8.2;

(x)	usual and customary insurance premiums financed in the normal course of business;

(xi)	Indebtedness regarding self-insured liabilities, including retentions under insurance policies;

(xii)

miscellaneous items of unsecured Indebtedness not described in subsections (i) through (xi) above which do not in the total (taking into account all such Indebtedness of the Credit Parties) exceed $40,000,000 at any one time outstanding; and

(xiii)

extensions, renewals and replacements of any such Indebtedness that do not increase the outstanding principal amount thereof or result in an earlier maturity date or decreased remaining weighted average life to maturity thereof;

7.3 Limitation on Fundamental Changes . Borrowers will not enter into (nor permit any other Credit Party to enter into) any merger, consolidation or amalgamation, or liquidate, wind up or dissolve itself (or suffer any liquidation or dissolution), or convey, sell, lease, assign, transfer or otherwise dispose of all or substantially all of its property, businesses and assets, or make any material change in its present method of conducting business, except:

(i)

any Subsidiary of a Credit Party may be merged, consolidated or with or into such Credit Party (provided that such Credit Party will be the continuing or surviving business entity or other entity) or with or into any one or more wholly owned Subsidiaries of the Credit Party that is a Borrower or Subsidiary Guarantor (provided that the wholly owned Borrower or Subsidiary Guarantor will be the continuing or surviving business entity or other entity);

(ii)

any Wholly Owned Subsidiary of a Credit Party may convey, sell, lease, assign, transfer or otherwise dispose of any or all of its properties, business and assets (on voluntary liquidation or otherwise) to or liquidate, wind up or dissolve into, such Credit Party or any other Wholly Owned Subsidiary of such Credit Party that is a Borrower or Subsidiary Guarantor; and

(iii)

so long as no Default, Event of Default or Deficiency will exist or be caused as a result, a Person may be merged, consolidated or amalgamated with or into a Borrower or a Subsidiary Guarantor so long as the Borrower or Subsidiary Guarantor, as applicable, is the continuing or surviving business entity or other entity.

7.4 Sale of Property . The Borrowers will not (nor will they permit any other Credit Party to) lease, sell or otherwise dispose of its Property to any other Person, except:

(i)

sales of inventory in the ordinary course of business or the sale of other assets not included in the Borrowing Base and not in excess of $125,000,000 in total from the effective date of this Agreement; provided further, however, in no event shall any drilling rigs or such other assets of any of the Credit Parties be sold or otherwise disposed of after the occurrence of a Default, an Event of Default or a Deficiency that remains uncured or would be caused by or result from such sale or disposition without the prior written consent of the Required Lenders, and, in such event, the net proceeds of such sale or disposition of drilling rigs and such other assets shall be applied as a mandatory principal prepayment of the Loans;

(ii)	dispositions of equipment and other personal property that is replaced by equivalent property or consumed in the normal operation of the Property of the respective Credit Parties;

(iii)

dispositions of a portion of its Property in connection with operating agreements, farmouts, farmins, joint exploration and development agreements and other agreements customary in the oil and gas industry that are entered into for the purposes of developing its Property and under which it receives relatively equivalent consideration;

(iv)

leases, sales or other dispositions of its Property that, together with all other Property of the Credit Parties and their Subsidiaries previously leased, sold or disposed of (other than (i), (ii) and (iii) above and clauses (v) and (vi) below) as permitted by this Section 7.4 during the period since the most recent Determination Date, do not have, together with any Financial Contract concerning hedged production that is unwound or otherwise modified or liquidated prior to scheduled termination to the extent included in the estimated future price of production from the Borrowing Base Properties in the calculations of the Borrowing Base as of such Determination Date under Section 2.6, constitute more than fifteen percent (15%) of the Borrowing Base as determined by Administrative Agent, such amount being promptly furnished to Unit by the Administrative Agent; further provided, however, to the extent such total consideration for the sum of all asset sales or other dispositions of Properties plus any such unwound or liquidated commodity hedge contracts, in excess fifteen percent (15%) of the Borrowing Base during any period between Scheduled Redetermination Dates, the Required Lenders will have the option to reduce the Borrowing Base by the amount equal to the reduction in the Borrowing Base attributable to the sum of the Properties’ so disposed of plus unwound commodity hedge contracts and, further, provided, that any resulting Deficiency (as defined in Section 2.6.7) must be cured by the Borrowers in compliance with Section 2.8.2;

(v)	Hydrocarbon Interests to which no proved reserves of Hydrocarbons are properly attributed; and

(vi)	leases, sales or other dispositions permitted under Section 7.3(ii).

7.5 Investments and Acquisitions . The Borrowers will not (nor will they permit any other Credit Party to) make or suffer to exist any Investments, or to make any Acquisition of any Person, except:

(i)	Cash Equivalent Investments;

(ii)	Investments between Credit Parties or in any Credit Party’s Subsidiaries (other than in Existing Subordinated Note Additional Parties);

(iii)

(1) Investments in existence on, or contractually committed as of, the date hereof and described on the Disclosure Schedule and (2) any extensions, renewals or reinvestments thereof, so long as the aggregate amount of all Investments pursuant to this clause (iii) is not increased at any time above the amount of such Investments existing or contractually committed on the date hereof;

(iv)

Investments in associations, joint ventures, and other relationships (a) that are established under standard form operating agreements or similar agreements or which are partnerships for purposes of federal income taxation only, (b) that are not corporations or partnerships (or subject to the Uniform Partnership Act or other applicable state partnership act) under applicable state law, (c) which are limited partnerships formed for investment by employees and Directors of Unit and its Subsidiaries in the oil and gas exploration and development operations of Unit and its Subsidiaries, or (d) whose businesses are limited to the exploration, development and operation of oil, gas or mineral properties and in which the ownership interest of any Credit Party or its Subsidiary is in direct proportion to the amount of such Investment; and

(v)

any Acquisition in the same line of business as, or businesses related or ancillary to, the business of the Credit Parties, provided that (i) immediately prior to and after giving effect to the Acquisition, no Default, Event of Default or Deficiency has occurred and is continuing, (ii) any Person that becomes a Subsidiary of Unit as a result of the Acquisition shall become a Subsidiary Guarantor, in accordance with and to the extent required under Section 9.1; and (iii) after taking into consideration any such Acquisition, the Credit Parties are in compliance with Article 8 hereof.

7.6 Liens . The Borrowers will not (nor will they permit any other Credit Party to) create, incur, or suffer to exist any Lien in, of or on the Property of the Credit Parties or any of their Subsidiaries, except:

(i)

Liens for Taxes, assessments or governmental charges or levies on its Property if the same will not at the time be delinquent or thereafter can be paid without penalty, or are being contested in good faith and by appropriate proceedings and for which adequate reserves in accordance with GAAP will have been set aside on its books;

(ii)

Liens imposed by law, such as carriers’, warehousemen’s and mechanics’ Liens and other similar Liens arising in the ordinary course of business which secure payment of obligations not more than 90 days past due or which are being contested in good faith by appropriate proceedings and for which adequate reserves, in accordance with GAAP, will have been set aside on its books;

(iii)

Liens arising out of pledges or deposits under workers' compensation laws, unemployment insurance, old age pensions, or other social security or retirement benefits, or similar legislation;

(iv)

utility easements, building restrictions, servitudes, permits, conditions, covenants, exceptions or reservations and such other encumbrances or charges against any Property of the Borrowers or any Subsidiary thereof for the purpose of roads, pipelines, transmission lines, transportation lines, distribution lines for the removal of oil, gas, coal or other minerals to timber, and other like purposes, or for the joint or common use of real estate, rights of way, facilities and equipment. that do not secure any monetary obligation or which, in the aggregate, impair in any material way the use or marketability of such Property for the purposes of which such Property is held by any of the Credit Parties or their Subsidiaries or materially impair the value of such Property in the Businesses of the Credit Parties or their Subsidiaries;

(v)	Liens existing on the date hereof and described on the Disclosure Schedule;

(vi)	Liens in favor of the Administrative Agent, for the benefit of the Lenders;

(vii)

Liens on Property to secure not more than $15,000,000 in total of the Indebtedness permitted by Sections 5.14 and 7.2(v);

(viii)

with respect to Property subject to any Loan Document, Liens burdening such Property that are expressly allowed by such Loan Document;

(ix)

Liens arising under operating agreements, unitization, pooling agreements and other agreements customary in the oil and gas industry securing amounts owed to operators and joint owners of Oil and Gas Properties that will not at the time be delinquent, or thereafter can be paid without penalty, or are being contested in good faith and by appropriate proceedings and for which adequate reserves in accordance with GAAP will have been set aside on its books;

(x)	contracts, agreements, instruments, obligations, defects and irregularities affecting the Property that individually or in total are not such as to interfere materially with the use, operation or value of the Property;

(xi)	any Lien existing on any asset prior to its acquisition by a Borrower or one of its Subsidiaries and not created in contemplation of the acquisition;

(xii)

judgment and attachment Liens not giving rise to a Default or Event of Default, provided that any appropriate legal proceedings which may have been duly initiated for the review of such judgment shall not have been finally terminated or the period within which such proceeding may be initiated shall not have expired and no action to enforce such Lien has been commenced; and

(xiii)

any extension, renewal or replacement (or successive extensions, renewals or replacements), as a whole or in part, of any Liens referred to in (i) – (xii) above for amounts not exceeding the principal amount of the Indebtedness secured by the Lien so extended, renewed or replaced.

7.7 Affiliates . The Borrowers will not (nor will they permit any other Credit Party to) enter into any transaction (including, without limitation, the purchase or sale of any Property or service) with, or make any payment or transfer to, any Affiliate except on terms no less favorable to the Credit Party than it would obtain in a comparable arms-length transaction, and (ii) transactions, payments or transfers permitted by Section 7.1, 7.3 or 7.5.

7.8 Contingent Obligations . The Borrowers will not (nor will they permit any other Credit Party to) make or suffer to exist any Contingent Obligation (including, without limitation, any Contingent Obligation with respect to the obligations of a Subsidiary), except (i) by endorsement of instruments for deposit or collection in the ordinary course of business, (ii) the Reimbursement Obligations, (iii) the Subsidiary Guaranty, (iv) liabilities associated or accrued for abandonment and plugging of Credit Parties’ Oil and Gas Properties, (v) as general partner of the limited partnerships formed annually to allow employees and directors of Unit to participate in certain of its oil and gas exploration and production operations; (vi) existing Contingent Obligations set forth on Schedule 7 and the Disclosure Schedule, (vii) Contingent Obligations in respect of Indebtedness permitted to be incurred under Section 7.2(ix), and (viii) other Contingent Obligations not to exceed an outstanding total amount of $50,000,000 at any time.

7.9 Financial Contracts . None of the Credit Parties will be a party to or in any manner be liable on any Financial Contract except:

(i)

contracts entered into with the purpose and effect of fixing prices on commodities expected to be produced, gathered or processed by the Credit Parties and their Subsidiaries, provided that at all times: (i) no such contract fixes a price for a term of more than 60 months (subject to the reporting requirements of Section 6.1(iii)); (ii) the total monthly volumes produced, gathered and processed covered by all such contracts for any single month does not in total exceed ninety percent (90%) of the Total Projected Proved Production (as defined below) of the Credit Parties and their Subsidiaries anticipated to be sold in the ordinary course of their businesses for such month, (iii) no such contract requires or permits the Credit Parties or any of their Subsidiaries to post or put up money, assets, letters of credit or other security or margin against the event of its nonperformance of their obligations thereunder and (iv) each such contract is with a counterparty or has a guarantor of the obligation of the counterparty who (unless such counterparty of such contract is a Lender Counterparty) at the time the contract is made has long-term obligations rated BBB+ or Baal or better, respectively, by either Moody’s or S&P;

As used in this subsection, the term “Total Projected Proved Production” means the internally reasonably projected production, gathering and processing of commodities (measured by volume unit or BTU equivalent, not sales price) for the term of the contracts or a particular month, as applicable, from properties and interests owned or volumes gathered and processed (and with respect to such volumes gathered or processed, such volumes are equity volumes (i.e., the Credit Parties or their Subsidiaries have ownership or equity interests therein)) by the Credit Parties and their Subsidiaries that are located in or offshore of the United States; and

(ii)

contracts entered into by Credit Parties or their Subsidiaries effectively converting interest rates from fixed to floating, the notional amounts of which (when aggregated with all other contracts of the Credit Parties and their Subsidiaries then in effect converting interest rates from fixed to floating) do not exceed 50% of the then outstanding principal amount of the Credit Parties' Indebtedness for borrowed money which bears interest at a fixed rate and contracts entered into by Credit Parties or their Subsidiaries effectively converting interest rates from floating to fixed, the notional amounts of which (when aggregated with all other contracts entered into by Credit Parties or their Subsidiaries then in effect from floating to fixed) do not exceed 75% of the then outstanding principal amount of Credit Parties Indebtedness for borrowed money which bears interest at a floating rate; provided that no contract will be entered into by any Credit Party or its Subsidiaries for speculative purposes.

Notwithstanding the exceptions described in clauses (i) and (ii) above, in no event shall any Credit Party speculate on the movement of commodity prices, securities prices, financial markets, currency market or other items or otherwise enter into any Financial Contract for speculative purposes; provided, however nothing in this Section 7.9 shall prohibit Unit or other Credit Parties from entering into interest rate swaps or interest rate hedge transactions pursuant to which Unit hedges interest rate risk with respect to interest reasonably anticipated to be incurred under this Agreement or in compliance with Section 7.9(ii).

7.10 Letters of Credit . The Borrowers will not (nor will they permit any other Credit Party to) apply for or become liable on or in respect of any Letter of Credit other than LCs issued under this Agreement.

7.11 Prohibited Contracts . Borrowers will not (nor will they permit any other Credit Party to) enter into, create, or otherwise allow to exist any contractual or other consensual restriction on the ability of any Subsidiary of a Borrower to: (a) pay dividends or make other distributions to the Credit Parties, (b) to redeem equity interests held in it by other Credit Parties, or (c) to repay loans and other indebtedness owing by it to the Credit Parties: except (i) restrictions contained in this Agreement or the other Loan Documents, (ii) restrictions existing on the date hereof and set forth on the Disclosure Schedule and extensions, renewals or replacements thereof not expanding the scope thereof, (iii) restrictions contained in the Existing Subordinated Notes Indenture or in any other agreement governing or evidencing any other Indebtedness permitted under Section 7.2, provided that the restrictions contained in any such other agreement are no less favorable in any material respect to the Lenders than the restrictions contained in the Existing Subordinated Notes Indenture (iv) with respect to any Subsidiary that is not a Wholly-Owned Subsidiary, restrictions in such Subsidiary’s organizational documents or pursuant to any joint venture agreement or equity holders agreement, (v) restrictions contained in any agreement in effect at the time any Person becomes a Subsidiary, so long as such agreement was not entered into in contemplation of such Person becoming a Subsidiary, (vi) restrictions created by virtue of any sale, transfer, lease or other disposition of, or any agreement with respect thereto, any specific property, assets or equity interests permitted to be so transferred under this Agreement, and (vii) in any amendments, modifications, restatements, renewals, increases, supplements, refundings, replacements or refinancings of the contracts, instruments or obligations referred to in clauses (i) through (vi) above; provided that such amendments, modifications, restatements, renewals, increases, supplements, refundings, replacements or refinancings are, in the good faith judgment of Unit, no more restrictive with respect to the restrictions referred to in clauses (a) through (c) above than prior to such amendment, modification, restatement, renewal, increase, supplement, refunding, replacement or refinancing Credit Parties.

7.12 Negative Pledge . Except only for Liens permitted by applicable subsections of Section 7.6, none of the Borrowers will (nor will they permit any other Credit Party or any Material Subsidiary thereof) cause or permit the pledging, encumbrance, mortgaging, granting of a consensual security interest or any other type of pledge, charge or imposition of a Lien against any Credit Parties’ or any Subsidiaries’ (i) oil and gas mining and mineral interests, rights and properties, proved, developed, producing or otherwise or (ii) any midstream assets (whether now owned or hereafter created or acquired), to the extent either clause (i) or (ii) above constitute a part of the Borrowing Base Properties, to secure any Indebtedness (including Contingent Obligations), without the prior written consent of the Administrative Agent and the Required Lenders. This covenant, to the fullest extent permitted by applicable law, will be deemed and construed as a “negative pledge” of all such assets referenced in clauses (i) and (ii) above in favor of the Administrative Agent for the benefit of the Lenders; provided, that, prior to the occurrence of a Default, Event of Default or Deficiency, the Credit Parties may continue to receive the production proceeds of the Oil and Gas Properties and revenues of their midstream assets.

7.13 Redemption of Existing Subordinated Notes; Amendment of Existing Subordinated Notes Indenture . The Borrowers will not, and will not permit any Subsidiary, prior to the Facility Termination Date:

(i) call, make or offer to make any optional or voluntary redemption of or otherwise optionally or voluntarily redeem (whether in whole or in part) the Existing Subordinated Notes; except only with (A) the Net Cash Proceeds of any sale of equity interests, or (B) the Net Cash Proceeds of any issuance of Indebtedness pursuant to Section 7.2(ix) or 7.2(xiii), or

(ii) amend, modify, waive or otherwise change, consent or agree to any amendment, supplement, modification, waiver or other changes to, any of the terms of the Existing Subordinated Notes or the Existing Subordinated Notes Indenture if (A) the effect thereof would be to shorten its maturity to a date sooner than six (6) months after the Facility Termination Date or cause the weighted average life to maturity to be less than the weighted average life to maturity of the Loans, or increase the amount of any payment of such principal thereof or increase the rate of interest thereon, or (B) such action requires the payment of a consent fee (howsoever described) if the payment of such consent fee would have the pro forma effect causing Default under Section 8.1 or 8.2 hereof,

unless, (x) no Default, Event of Default or Deficiency exists or would result from or be caused by any such payment, redemption or actions contemplated in clauses (i) and/or (ii) above, and (y) immediately following such payment, redemption or action contemplated in clauses (i) and/or (ii) above, not less than twenty percent (20%) of the Total Commitment then in effect remains available for Borrowers under this Agreement;

provided that the foregoing limitations shall not prohibit the execution of supplemental indentures to add guarantors if required by the terms of the Existing Subordinated Notes Indenture provided such Person complies with Section 9.1 to the extent required thereby.

ARTICLE 8

FINANCIAL COVENANTS

8.1 Current Ratio . Unit will not permit the ratio, determined as of the end of each of Unit’s fiscal quarters, of (i) consolidated current assets of Unit and its Subsidiaries (including the then Available Total Commitment but excluding non-cash hedging assets resulting from the requirements of ASC 815 for any period of determination) to (ii) consolidated current liabilities of Unit and its Subsidiaries (excluding the current portion of the Loans and non-cash hedging obligations or liabilities resulting from the requirements of ASC 815 for any period of determination), to be less than 1.0 to 1.0.

8.2 Leverage Ratio . Unit will not permit the ratio, determined as of the end of each of Unit’s fiscal quarters, of (i) Funded Debt to (ii) Consolidated EBITDA for the then most-recently ended rolling four (4) fiscal quarters to be greater than 4.0 to 1.0.

ARTICLE 9

GUARANTEES

9.1 Guarantees . Unit will cause each current Material Domestic Subsidiary and each future Material Domestic Subsidiary to guarantee the prompt payment and performance when due of the Obligations in accordance with the terms and provisions of the Subsidiary Guaranty. As soon as practicable and in any event within ten (10) days after any Person becomes a Material Domestic Subsidiary, Unit will provide the Administrative Agent written notice thereof and will cause such Person to execute a Subsidiary Guaranty Joinder Agreement in substantially the same form as Schedule 1 to the Subsidiary Guaranty. Prior to any Investments being permitted to be made in any other Subsidiary of the Credit Parties, such Subsidiary will also execute and deliver such a Subsidiary Guaranty to the Administrative Agent for the ratable benefit of each Lender, together with such other certificates or documents as Administrative Agent reasonably deems necessary or appropriate to confirm such Subsidiary Guaranty, including without limitation, closing opinions (supplementing the closing opinion required by Section 4.1.1(v) of this Agreement) as required by the Administrative Agent or the Required Lenders in connection with the Subsidiary Guaranty instruments executed from time to time by Material Subsidiaries under this Section 9.1.

9.2 Releases of Guarantees . If, as a result of the consummation of any transaction permitted by this Agreement, any Subsidiary Guarantor ceases to be a Subsidiary of Unit, the guarantee of such Subsidiary Guarantor of the Obligations shall be automatically discharged and released without any further action by any Credit Party or any other Person effective as of the time of such transaction. Upon request of Unit, the Administrative Agent shall take (at the Credit Parties’ cost), and the Lenders hereby authorize the Administrative Agent to take, such actions as shall be reasonably requested to evidence the termination and release of the guarantee of such Subsidiary Guarantor.

9.3 Production Proceeds . Upon the occurrence of an Event of Default or a Deficiency not timely cured in accordance with Section 2.6.7, Administrative Agent and the Lenders may obtain possession of all production proceeds then held by the Credit Parties and their Subsidiaries to receive directly from the purchaser of production or the first purchaser of midstream assets all production proceeds and revenues therefrom.

ARTICLE 10

EVENTS OF DEFAULTS

10.1 Events of Default . The occurrence of any one or more of the following events will constitute an Event of Default:

10.1.1. Any representation or warranty made or deemed made by or on behalf of any of the Credit Parties to the Lenders or the Administrative Agent under or in connection with this Agreement, any Credit Extension, or any certificate, report or information delivered in connection with this Agreement or any other Loan Document is materially false on the date as of which made or deemed made.

10.1.2. Nonpayment of principal of any Loan when due, nonpayment of any Reimbursement Obligation within one Business Day after the same becomes due, or nonpayment of interest on any Loan or of any commitment fee, LC Fee or other obligations under any of the Loan Documents within ten (10) days after the same becomes due.

10.1.3. The failure of any of the Borrowers to observe or perform any covenant or agreement applicable thereto in Section 2.6.8, Section 6.2, Section 6.3, Article 7 and Article 8 of this Agreement and, only insofar as Article 9 is concerned, failure of Borrowers to cure, within ten (10) days following written notice from the Administrative Agent or any Lender to Unit, any violation or failure to observe any agreement applicable thereto in such Article 9.

10.1.4. The breach by any of the Borrowers (other than a breach which constitutes a Default or Event of Default under another Section of this Article 10) of any of the terms or provisions of this Agreement which is not remedied within thirty (30) days after written notice from the Administrative Agent or any Lender to Unit.

10.1.5. Failure of any Credit Party to pay when due any Material Indebtedness; (other than a Rate Management Obligation) or the default by any Credit Party in the performance (beyond the applicable grace period with respect thereto, if any) of any term, provision or condition contained in any Material Indebtedness Agreement (other than resulting from a Rate Management Transaction), or any other event occurs or condition exists, the effect of which default, event or condition is to cause, or to permit the holder(s) or lender(s) under such Material Indebtedness evidenced by such Material Indebtedness Agreement to cause (after the expiration of any applicable grace period with respect thereto), such Material Indebtedness to become due prior to its stated maturity or any commitment to lend under such Material Indebtedness Agreement to be terminated prior to its stated expiration date; or any Material Indebtedness will be declared to be due and payable or required to be prepaid or repurchased (other than by a regularly scheduled payment) prior to the stated maturity thereof; or the Credit Parties will not pay, or admit in writing their inability to pay, their Indebtedness generally as they become due.

10.1.6. Any Credit Party will (i) have an order for relief entered with respect to it under the Federal bankruptcy laws as now or hereafter in effect, (ii) make an assignment for the benefit of creditors, (iii) apply for, seek, consent to, or acquiesce in, the appointment of a receiver, custodian, trustee, examiner, liquidator or similar official for it or any substantial portion of its Property, (iv) institute any proceeding seeking an order for relief under the Federal bankruptcy laws as now or hereafter in effect or seeking to adjudicate it a bankrupt or insolvent, or seeking dissolution, winding up, liquidation, reorganization, arrangement, adjustment or composition of it or its Indebtedness under any law relating to bankruptcy, insolvency or reorganization or relief of Indebtedness or fail to file an answer or other pleading denying the material allegations of any such proceeding filed against it, (v) take any corporate or partnership action to authorize or effect any of the foregoing actions set forth in this Section 10.1.6 or (vi) fail to contest in good faith any appointment or proceeding described in Section 10.1.7.

10.1.7. Without the application, approval or consent of the Credit Parties, a receiver, trustee, examiner, liquidator or similar official will be appointed for any Credit Party or a proceeding described in Section 10.1.6(iv) will be instituted against any Credit Party and such appointment continues undischarged or such proceeding continues undismissed or unstayed for a period of 60 consecutive days.

10.1.8. Any court, government or governmental agency condemns, seizes or otherwise appropriates, or takes custody or control of, all or any portion of the Property of any Credit Party which, when taken together with all other Property of such Credit Party so condemned, seized, appropriated, or taken custody or control of, during the twelve-month period ending with the month in which any such action occurs, constitutes a Material Adverse Effect.

10.1.9. Any of the Credit Parties fails within 30 days to pay, bond or otherwise discharge one or more (i) judgments or orders for the payment of money in excess of $1,000,000 (or the equivalent thereof in currencies other than U.S. Dollars) in total (to the extent not covered by independent third party insurance provided by insurers of the highest claims paying rating or financial strength as to which the insurer does not dispute coverage and is not subject to insolvency proceedings, or (ii) non-monetary judgments or orders which, in each case, individually or in total, could reasonably be expected to have a Material Adverse Effect, which judgment(s), in any such case, is/are not stayed on appeal or otherwise being appropriately contested in good faith.

10.1.10. Unfunded Liabilities with respect to Single Employer Plans or the occurrence of or any material Reportable Event in connection with any Plan, which, in either case or in the aggregate exceeds $1,000,000.

10.1.11. Nonpayment by any Credit Party of any Rate Management Obligation when due or the breach by any Credit Party of any term, provision or condition contained in any Rate Management Transaction or any transaction of the type described in the definition of “Rate Management Transactions,” whether or not any Lender or Affiliate of a Lender is a party thereto, after taking into account any applicable grace period, but only if such nonpayment or breach constitutes a Material Adverse Effect.

10.1.12. Any Change in Control occurs.

10.1.13. Any Credit Party (i) is the subject of any proceeding or investigation pertaining to the release by any Credit Party of any toxic or hazardous waste or substance into the environment, or (ii) violates any Environmental Law, which, in the case of an event described in clause (i) or clause (ii), could reasonably be expected to have a Material Adverse Effect.

10.1.14. Except to the extent expressly permitted by the Loan Documents, any Subsidiary Guaranty fails to remain in full force or effect or any action is taken to discontinue or to assert the invalidity or unenforceability of any Subsidiary Guaranty, or any Subsidiary Guarantor fails to comply with any of the terms or provisions of any Subsidiary Guaranty to which it is a party, or any Subsidiary Guarantor denies that it has any further liability under any Subsidiary Guaranty to which it is a party, or gives notice to such effect.

10.1.15. Any Credit Party fails to comply in any material respect with any of the terms or provisions of any Loan Document (other than this Agreement, Notes issued hereunder and, insofar as representations and warranties made or deemed made in any other Loan Document, the other Loan Documents) beyond any applicable grace or curative period therein specified and if not so specified, if not cured within twenty (20) days following written notice from the Administrative Agent.

ARTICLE 11

ACCELERATION, WAIVERS, AMENDMENTS AND REMEDIES

11.1 Acceleration . .

11.1.1. If any Event of Default described in Section 10.1.6 or 10.1.7 occurs with respect to the Credit Parties, the obligations of the Lenders to make Advances and Loans hereunder and the obligation and power of the LC Issuer to issue LCs will automatically terminate and the Obligations (other than Rate Management Obligations owed to Lender Counterparties) will immediately become due and payable without any election or action on the part of the Administrative Agent, the LC Issuer or any Lender and the Credit Parties will be and become thereby unconditionally obligated, without any further notice, act or demand, to deposit in an account with the Administrative Agent an amount in immediately available funds equal to the amount of LC Obligations in cash or cash equivalents reasonably satisfactory to the Administrative Agent, which funds will be applied pursuant to Section 11.1.2. If any other Event of Default occurs and is continuing, the Required Lenders (or the Administrative Agent with the consent of the Required Lenders) may (a) terminate or suspend the obligations of the Lenders to make Loans hereunder and the obligation and power of the LC Issuer to issue LCs, or declare the Obligations (other than Rate Management Obligations owed to Lender Counterparties) to be due and payable, or both, in which event such Obligations will become immediately due and payable, without presentment, demand, protest or notice of any kind, all of which the Borrowers hereby expressly waive, and (b) on notice to the Borrowers and in addition to the continuing right to demand payment of all amounts payable under this Agreement, make demand on the Borrowers to pay, and the Borrowers will, forthwith on such demand and without any further notice or act, immediately pay to the Administrative Agent the amount in immediately available funds equal to the amount of such LC Obligations, which funds will be applied pursuant to Section 11.1.2.

11.1.2. The Administrative Agent may at any time or from time to time, after such funds are deposited with the Administrative Agent, apply such funds to the payment of the Obligations in accordance with Section 11.4 and any other amounts as may have become due and payable by the Credit Parties to the Lenders or the LC Issuer under the Loan Documents. Such funds (to the extent not applied as aforesaid) will be returned to the Borrowers (i) after all such Obligations and other amounts have been paid in full or (ii) within three (3) Business Days after all Events of Default have been cured or waived.

11.2 Amendments . Subject to the provisions of this Section 11.2, the Required Lenders (or the Administrative Agent with the consent in writing of the Required Lenders) and the Credit Parties may enter into supplemental agreements for the purpose of adding or modifying any provisions to the Loan Documents to which they are parties or changing in any manner the rights of the Lenders or the Borrowers under this Agreement or waiving any Default, Event of Default or Deficiency under this Agreement, provided that no supplemental agreement will, without the consent of all of the Lenders:

(i)

Extend the final maturity of any Loan, or extend the expiration date of an LC to a date after the Facility Termination Date or postpone any regularly scheduled payment of principal of any Loan or forgive all or any portion of the principal amount thereof or any Reimbursement Obligation related thereto, or reduce the rate or extend the time of payment of interest or fees thereon or Reimbursement Obligations related thereto;

(ii)	Reduce the percentage specified in the definition of Required Lenders or eliminate, delete or modify the Borrowing Base concept of Section 2.6;

(iii)

Extend the Facility Termination Date (other than pursuant to Section 3.8), or reduce the amount or extend the payment date for, the mandatory principal payments required under Section 2.8.2, or increase the (a) Maximum Credit Amount, (b) Total Commitment Amount above the Maximum Credit Amount, (c) Borrowing Base (other than pursuant to Section 2.6), (d) amount of the Commitment of any non-consenting Lender under this Agreement or (e) commitment to issue LCs (other than as provided in the definition of “LC Sublimit”); or

(iv)	Amend this Section 11.2 or permit the Borrowers to assign their rights under this Agreement.

Further provided, that no amendment of any provision of this Agreement relating to the Administrative Agent will be effective without the written consent of the Administrative Agent, and no amendment of any provision relating to the LC Issuer will be effective without the written consent of the LC Issuer.

11.3 Preservation of Rights . No delay or omission of the Lenders, the LC Issuer or the Administrative Agent to exercise any right under the Loan Documents will impair such right or be construed to be a waiver of any Default, Event of Default or Deficiency or an acquiescence in such Default, Event of Default or Deficiency, and the making of a Credit Extension notwithstanding the existence of a Default, Event of Default or Deficiency or the inability of the Credit Parties to satisfy the conditions precedent to such Credit Extension will not constitute any waiver or acquiescence. Any single or partial exercise of any such right will not preclude other or further exercise of such right or the exercise of any other right, and no waiver, amendment or other variation of the terms, conditions or provisions of the Loan Documents whatsoever will be valid unless in writing executed by the Lenders required under Section 11.2, and then only to the extent specifically set forth in writing. All remedies contained in the Loan Documents or by law or equity afforded will be cumulative and will be available to the Administrative Agent, the LC Issuer and the Lenders until the Obligations have been paid in full.

11.4 Allocation of Payments After Event of Default . Notwithstanding any other provisions of this Agreement to the contrary, after the occurrence and during the continuance of an Event of Default, all amounts collected or received on or in respect of the Obligations (or other amounts owing under the Loan Documents in connection therewith) shall be paid over or delivered as follows:

FIRST, to the payment of all reasonable out-of-pocket costs and expenses (including reasonable attorneys' fees) of the Administrative Agent, the LC Issuer or the Lenders in connection with enforcing the rights and remedies of the Administrative Agent or the Lenders under the Loan Documents and any protective advances made with respect thereto or otherwise with respect to the Obligations owing to the Lenders, the LC Issuer or the Administrative Agent;

SECOND, to payment of any fees owed to the Lenders, the LC Issuer or the Administrative Agent hereunder;

THIRD, to the payment of all accrued interest and fees on or in respect of the Obligations;

FOURTH, to the payment of the outstanding principal amount of the Obligations hereunder (including the payment or cash collateralization of the outstanding LC Obligations and Rate Management Obligations owed to Lender Counterparties being paid on a pari passu basis with the repayment of other Obligations);

FIFTH, to all other Obligations hereunder and other obligations which shall have become due and payable under the Loan Documents otherwise and not repaid pursuant to clauses "FIRST" through "FOURTH" above; and

SIXTH, to the payment of the surplus, if any, to Unit or such other Persons as may be lawfully entitled to receive such surplus.

In carrying out the foregoing, (i) amounts received shall be applied in the order provided until exhausted prior to application to the next succeeding category to the Administrative Agent or in accordance with each Lender's Pro Rata Share, as applicable, (unless a Lender is a Defaulting Lender); and (ii) to the extent that any amounts available for distribution pursuant to clause "FOURTH" above are attributable to the issued but undrawn amount of outstanding Letters of Credit, such amounts shall be held by the Administrative Agent in a cash collateral account and applied (A) first, to reimburse the LC Issuer for any drawings under such Letters of Credit and (B) then, following the expiration of all Letters of Credit, to all other obligations of the types described in clauses "THIRD" and "FOURTH" above in the manner provided in this Section 11.4.

ARTICLE 12

GENERAL PROVISIONS

12.1 Survival of Agreements . All covenants, agreements, representations and warranties contained in this Agreement will survive the making of the Credit Extensions during the term of this Agreement and any amendments of this Agreement (other than to the extent expressly modified therein).

12.2 Governmental Regulation . Anything contained in this Agreement to the contrary notwithstanding, neither the LC Issuer nor any Lender will be obligated to extend credit to the Borrowers in violation of any limitation or prohibition provided by any applicable statute or regulation.

12.3 Headings . Section headings in the Loan Documents are for convenience of reference only, and will not govern the interpretation of any of the provisions of the Loan Documents.

12.4 Entire Agreement . The Loan Documents embody the entire agreement and understanding among the Credit Parties, the Administrative Agent, the LC Issuer and the Lenders and supersede all prior agreements and understandings among the Credit Parties, the Administrative Agent, the LC Issuer and the Lenders relating to the subject matter of the Loan Documents other than the Administrative Agent Fee Letter, all of which will survive and remain in full force and effect during the term of this Agreement.

12.5 Several Obligations; Benefits of this Agreement . The respective obligations of the Lenders hereunder are several and not joint and no Lender will be the partner or Administrative Agent of any other (except to the extent to which the Administrative Agent is authorized to act in such capacity). The failure of a Lender to perform any of its obligations hereunder will not relieve any other Lender from any of its obligations hereunder. This Agreement will not be construed so as to confer any right or benefit on any Person other than the parties to this Agreement and their respective successors and assigns.

12.6 Expenses; Indemnification .

12.6.1. Expenses . The Borrowers will promptly reimburse the Administrative Agent for any filing and recording fees, reasonable costs and out-of-pocket expenses (including reasonable attorneys’ fees), time charges and expenses advanced of attorneys for the Administrative Agent or for any of the Lenders) paid or incurred by the Administrative Agent or the Co-Syndication Agents in connection with the preparation, negotiation, execution, closing, delivery, syndication, review, amendment, waiver, consent or modification, refinancing, Lien perfection, administration, collection and enforcement of the Loan Documents, regardless of whether or not the transactions provided for in this Agreement are eventually closed and regardless of whether or not any or all sums evidenced by the Notes are advanced to the Borrowers by the Lenders.

12.6.2. Indemnification . The Borrowers hereby also agree to indemnify against and, where applicable, reimburse for, the Administrative Agent, the Co-Syndication Agents, the LC Issuer and each Lender, its directors, officers and employees, all losses, claims, damages, penalties, judgments, liabilities and expenses (including, without limitation, the prompt reimbursement of all legal fees and expenses of attorneys for the Administrative Agent, the Co-Syndication Agents, the LC Issuer or any of the Lenders in connection with (i) restructure as a part of loan work out or special asset modification or fees and expenses from enforcement or collection actions or proceedings, and (ii) collection and enforcement actions or proceedings, including litigation or preparation therefor whether or not the Administrative Agent, the Co-Syndication Agents, the LC Issuer or any Lender is a party to such litigation) which any of them may pay or incur in good faith as a result of this Agreement, the other Loan Documents, the transactions contemplated by the Loan Documents except to the extent that they are determined in a final non-appealable judgment by a court of competent jurisdiction to have resulted from the gross negligence or willful misconduct of the party seeking indemnification.

The foregoing provisions of this Section 12.6 shall not apply to Taxes, which shall be governed exclusively by Section 3.3. The obligations of the Borrowers under this Section 12.6 will survive the termination of this Agreement.

12.7 Severability of Provisions . Any provision in any Loan Document that is held to be inoperative, unenforceable, or invalid in any jurisdiction will, as to that jurisdiction, be inoperative, unenforceable, or invalid without affecting the remaining provisions in that jurisdiction or the operation, enforceability, or validity of that provision in any other jurisdiction. The provisions of all Loan Documents are severable.

12.8 Environmental Indemnities . Each of the Borrowers hereby agrees to indemnify, defend and hold harmless the Administrative Agent and the Lenders and their respective officers, directors, employees, agents, consultants, attorneys, contractors and their respective affiliates, successors or assigns, or transferees from and against, and reimburse said Persons in full with respect to, any and all loss, liability, damage, fines, penalties, costs and expenses, of every kind and character, including reasonable attorneys’ fees and court costs, known or unknown, fixed or contingent, occasioned by or associated with any claims, demands, causes of action, suits and/or enforcement actions, including any administrative or judicial proceedings, and any remedial, removal or response actions ever asserted, threatened, instituted or requested by any Persons, including any Governmental Authority, arising out of or related to: (a) the breach of any representation or warranty of the Borrowers contained in Section 5.16; (b) the failure of the Borrowers to perform any of their respective covenants contained in Section 6.7; (c) the ownership, construction, occupancy, operation, use of the Credit Parties’ Properties prior to the date on which the Indebtedness and obligations secured hereby have been paid and performed in full; provided, however, this indemnity shall not apply with respect to matters caused by or arising solely from the Administrative Agent’s or the Lenders’ activities during any period of time the Administrative Agent or the Lenders acquire ownership of the Credit Parties’ Properties.

The indemnities contained in this Section 12.8 apply, without limitation, to any violation on or before the Release Date of any Environmental Laws and any liability or obligation relating to the environmental conditions on, under or about the Credit Parties’ Properties on or prior to the Release Date (including, without limitation: (a) the presence on, on or in the Credit Parties’ Properties or release, discharge or threatened release on, on or from the Credit Parties’ Properties of any polluting substances generated, used, stored, treated, disposed of or otherwise released prior to the Release Date, and (b) any and all damage to real or personal property or natural resources and/or harm or injury including wrongful death, to persons alleged to have resulted from such release of any polluting substances regardless of whether the act, omission, event or circumstances constituted a violation of any Environmental Law at the time of its existence or occurrence). The term “release” shall have the meaning specified in applicable Environmental Laws and the terms “stored,” “treated” and “disposed” shall have the meanings specified in applicable Environmental Laws; provided, however, any broader meanings of such terms provided by applicable laws of the State of Oklahoma shall apply.

The provisions of this Section 12.8 shall be in addition to any other obligations and liabilities Credit Parties may have to the Administrative Agent or the Lenders at common law and shall survive the Release Date and shall continue thereafter in full force and effect.

The Administrative Agent and the Lenders agree that in the event that such claim, suit or enforcement action is asserted or threatened in writing or instituted against them or any of their officers, employers, agents or contractors or any such remedial, removal or response action is requested of them or any of their officers, employees, agents or contractors for which the Administrative Agent or the Lenders may desire indemnity or defense hereunder, the Administrative Agent or the Lenders shall give prompt written notification thereof to Unit.

Notwithstanding anything to the contrary stated herein, the indemnities created by this Section 12.8 shall only apply to losses, liabilities, damages, fines, penalties, costs and expenses actually incurred by the Administrative Agent or the Lenders as a result of claims, demands, actions, suits or proceedings brought by Persons who are not the beneficiaries of any such indemnity. The Administrative Agent or the Lenders shall act as the exclusive agent for all indemnified Persons under this Section 12.8. With respect to any claims or demands made by such indemnified Persons, the Administrative Agent shall notify Unit within ten (10) days after the Administrative Agent’s receipt of a writing advising the Administrative Agent of such claim or demand. Such notice shall identify (i) when such claim or demand was first made, (ii) the identity of the Person making it, (iii) the indemnified Person and (iv) the substance of such claim or demand. Failure by the Administrative Agent to so notify Unit within said ten (10) day period shall reduce the amount of the Credit Parties’ obligations and liabilities under this Section 12.8 by an amount equal to any damages or losses suffered by the Credit Parties resulting from any prejudice caused the Credit Parties by such delay in notification from the Administrative Agent. On receipt of such notice, the Credit Parties shall have the exclusive right and obligation to contest, defend, negotiate or settle any such claim or demand through counsel of their own selection (but reasonably satisfactory to the Administrative Agent and the Lenders) and solely at Credit Parties’ own cost, risk and expense; provided, that the Administrative Agent and the Lenders, at their own cost and expense, shall have the right to participate in any such contest, defense, negotiations or settlement. The settlement of any claim or demand hereunder by the Credit Parties, unless such settlement fully releases the Lenders from any and all liability thereon, may be made only on the prior approval of the Lenders of the terms of the settlement, which approval shall not be unreasonably withheld.

12.9 Nonliability of Lenders . The relationship between the Borrowers on the one hand and the Lenders, the LC Issuer and the Administrative Agent on the other hand will, to the extent that relationship is the subject of this Agreement, be solely that of borrowers and lenders. Neither the Administrative Agent, the Syndication Agents, the LC Issuer nor any Lender will have any fiduciary responsibilities to the Credit Parties. Neither the Administrative Agent, the Syndication Agent, the LC Issuer nor any Lender undertakes any responsibility to the Credit Parties to review or inform the Credit Parties of any matter in connection with any phase of the Credit Parties’ business or operations. The Credit Parties agree that neither the Administrative Agent, the Syndication Agent, the LC Issuer nor any Lender will have liability to the Credit Parties (whether sounding in tort, contract or otherwise) for losses suffered by the Credit Parties in connection with, arising out of, or in any way related to, the transactions contemplated and the relationship established by the Loan Documents, or any act, omission or event occurring in connection therewith, unless it is determined in a final non-appealable judgment by a court of competent jurisdiction that such losses resulted from the gross negligence or willful misconduct of the party from which recovery is sought. Neither the Administrative Agent, the Syndication Agent, the LC Issuer nor any Lender will have any liability with respect to, and the Credit Parties hereby waive, release and agree not to sue for, any special, indirect or consequential damages suffered by the Credit Parties in connection with, arising out of, or in any way related to the Loan Documents or the transactions contemplated thereby.

12.10 No Advisory or Fiduciary Responsibility. In connection with all aspects of each transaction contemplated hereby (including in connection with any amendment, waiver or other modification hereof or of any other Loan Document), Borrowers acknowledge and agree that: (i) (A) the arranging and other services regarding this Agreement provided by Administrative Agent are arm’s-length commercial transactions between Borrowers and their Affiliates, on the one hand, and Administrative Agent, on the other hand, (B) Borrowers have consulted their own legal, accounting, regulatory and tax advisors to the extent they have deemed appropriate, and (C) Borrowers are capable of evaluating, and understand and accept, the terms, risks and conditions of the transactions contemplated hereby and by the other Loan Documents; (ii) (A) Administrative Agent is and has been acting solely as a principal and, except as expressly agreed in writing by the relevant parties, has not been, is not and will not be acting ad an advisor, agent of fiduciary for Borrowers or any of their Affiliates, or any other Person and (B) Administrative Agent has not obligation to Borrowers or any of their Affiliates with respect to the transactions contemplated hereby except those obligations expressly set forth herein and in other Loan Documents; and (iii) Administrative Agent and its Affiliates may be engaged in a broad range of transactions that involve interest that differ from those of the Borrowers and their Affiliates, and the Administrative Agent has no obligation to disclose any of such interests to Borrowers or their Affiliates. To the fullest extent permitted by law, Borrowers hereby waive and release any claims that it may have against Administrative Agent with respect to any breach or alleged breach of agency or fiduciary duty in connection with any aspect of any transaction contemplated hereby.

12.11 Confidentiality . Each Lender agrees to hold as confidential any information which it may receive from the Credit Parties or any of its Subsidiaries under this Agreement or any other Loan Document in confidence, except for disclosure (i) to its Affiliates and to other Lenders and their respective Affiliates, (ii) to legal counsel, accountants, and other professional advisors to such Lender or to a Transferee (so long as such Persons are apprised of the confidential nature of such information), (iii) to regulatory officials, (iv) to any Person as requested under or as required by law, regulation, or legal process, (v) to any Person in connection with any legal proceeding relating to any of the Loan Documents to which such Lender is a party, (vi) to such Lender’s direct or indirect contractual counterparties in swap agreements, to legal counsel, accountants and other professional advisors to such counterparties or to any credit insurance provider relating to Borrowers and their obligations (so long as such Persons agree to be bound by the provisions of this Section 12.11), (vii) permitted by Section 14.4, (viii) to rating agencies if requested or required by such agencies in connection with a rating relating to the Advances, and (ix) of information that the Credit Parties have made available to the general public.

12.12 Disclosure . The Borrowers and each Lender hereby acknowledge and agree that BOk and/or its Affiliates from time to time may hold investments in, make other loans to or have other relationships with the Borrowers and/or their Subsidiaries.

12.13 Place of Payment . All amounts to be paid by the Borrowers or the Subsidiary Guarantors under this Agreement will be paid in immediately available funds to the Administrative Agent at its principal banking offices at Bank of Oklahoma Tower, One Williams Center, Tulsa, Oklahoma 74192, Attention: Energy Department - 8th Floor, or at such other place as the Administrative Agent or the Required Lenders will notify Unit in writing. If any interest, principal or other payment falls due on a date other than a Business Day, then (unless otherwise provided in this Agreement) such due date will be extended to the next succeeding Business Day, and such extension of time will in such case be included in computing interest, if any, in connection with such payment.

12.14 Interest . It is the intention of the parties to this Agreement that the Lenders conform strictly to usury laws applicable to it. Accordingly, if the transactions contemplated by this Agreement would be usurious as to a Lender under laws applicable to it (including the laws of the United States of America or any other jurisdiction whose laws may be mandatorily applicable to Lenders notwithstanding the other provisions of this Agreement), then, in that event, notwithstanding anything to the contrary in any of the Loan Documents or any agreement entered into in connection with or as security for the Notes, it is agreed as follows:

(i)

the total of all consideration which constitutes interest under law applicable to Lenders that is contracted for, taken, reserved, charged or received by Lenders under any of the Loan Documents or agreements or otherwise in connection with the Notes will under no circumstances exceed the Highest Lawful Rate allowed by such applicable law, and any excess will be canceled automatically and if theretofore paid will be credited by the Administrative Agent or the Lenders on the principal amount of the Obligations (or, to the extent that the principal amount of the Obligations will have been or would thereby be paid in full, refunded by Administrative Agent or the Lenders to the Borrowers); and

(ii)

in the event that the maturity of any of the Notes is accelerated by, because of or resulting from an Event of Default under this Agreement or otherwise, or in the event of any required or permitted prepayment, then such consideration that constitutes interest under law applicable to Administrative Agent or the Lenders may never include more than the maximum amount allowed by such applicable law, and excess interest, if any, provided for in this Agreement or otherwise will be canceled automatically by Lenders as of the date of such acceleration or prepayment and, if theretofore paid, will be credited by Administrative Agent or the Lenders on the principal amount of the Obligations (or, to the extent that the principal amount of the Obligations will have been or would thereby be paid in full, refunded by Lenders to the Borrowers).

All sums paid or agreed to be paid to Administrative Agent or the Lenders for the use, forbearance or detention of sums due under this Agreement will, to the extent permitted by law applicable to Administrative Agent and/or the Lenders, be amortized, prorated, allocated and spread throughout the full term of the Loans evidenced by the Notes until payment in full so that the rate or amount of interest on account of any Loans under this Agreement does not exceed the Highest Lawful Rate allowed by such applicable law. If at any time and from time to time (i) the amount of interest payable to Lenders on any date will be computed at the highest lawful rate applicable to Lenders under this Section 12.14; and (ii) in respect of any subsequent interest computation period the amount of interest otherwise payable to Lenders would be less than the amount of interest payable to Lenders computed at the highest lawful rate applicable to such Lenders, then the amount of interest payable to Lenders regarding such subsequent interest computation period will continue to be computed at the Highest Lawful Rate applicable to Lenders until the total amount of interest payable to Lenders equals the total amount of interest which would have been payable to Lenders if the total amount of interest had been computed without giving effect to this Section 12.14.

None of the terms and provisions contained in this Agreement or in any other Loan Document which directly or indirectly relate to interest will ever be construed without reference to this Section 12.14, or be construed to create a contract to pay for the use, forbearance or detention of money at an interest rate in excess of the Highest Lawful Rate.

12.15 Automatic Debit of Borrowers’ Operating Account . On Borrowers’ failure to pay all such costs and expenses owed by Borrowers under Section 12.6 of this Agreement within thirty (30) days of the Administrative Agent’s submission of invoices therefore, the Administrative Agent will pay such costs and expenses by debit to the operating account of Borrowers with the Administrative Agent without further or other notice to Borrowers.

12.16 Exceptions to Covenants . The Borrowers are not permitted to take any action or fail to take any action which is permitted as an exception to any of the covenants contained in this Agreement or which is within the permissible limits of any of the covenants contained in this Agreement if such action or omission would result in the breach of any other covenant contained in this Agreement.

12.17 Conflict with Other Loan Documents . To the extent the terms and provisions of any of the other Loan Documents are in conflict with the terms and provisions hereof, the terms and provisions of this Agreement will be deemed controlling.

12.18 Lost Documents . On receipt of an affidavit of an officer of the Administrative Agent as to the loss, theft, destruction or mutilation of the Notes or Loan Documents which is not of public record, and, in the case of any mutilation, on the surrender and cancellation of the Notes or Loan Documents, the Borrowers or any Subsidiary Guarantors will issue, in lieu thereof, a replacement Note(s) or other Loan Documents in the same principal amount thereof (in the case of any of the Notes) and otherwise of like tenor.

12.19 Setoff. At any time and from time to time during the continuance of any Event of Default, each Lender is hereby authorized to setoff and apply (a) any and all moneys, securities and other property (and the proceeds therefrom) of such Credit Party now or hereafter held or received by or in transit to such Lender from or for the account of such Credit Party, whether for safekeeping, custody, pledge, transmission, collection or otherwise, (b) any and all deposits and deposit accounts (general or special, time or demand, provisional or final) of such Credit Party with such Lender, and (c) any other credits and claims of such Credit Party at any time existing against such Lender, including claims under certificates of deposit (excluding from the foregoing clauses (a) though (c) the accounts at BOk as specified on Schedule 6 (collectively, the “ Excluded Accounts “)) against the Obligations then due and payable and held by such Lender (without notice to any Credit Party) and concerning any such action in clauses (a) through (c) taken by a Lender, prompt notice thereof shall be provided by such Lender to the Administrative Agent. The rights of each Lender under this Section 12.19 are in addition to all other interests and rights of such Lender at common Law, under the Loan Documents, or otherwise.

ARTICLE 13

THE ADMINISTRATIVE AGENT

13.1 Appointment; Nature of Relationship . Administrative Agent is hereby appointed by each of the Lenders as its contractual representative hereunder and under each other Loan Document, and each of the Lenders irrevocably authorizes the Administrative Agent to act as the contractual representative of such Lender with the rights and duties expressly set forth herein and in the other Loan Documents. The Administrative Agent agrees to act as such contractual representative on the express conditions contained in this Article 13. Notwithstanding the use of the defined term “Administrative Agent,” it is expressly understood and agreed that the Administrative Agent will not have any fiduciary responsibilities to any Lender by reason of this Agreement or any other Loan Document and that the Administrative Agent is merely acting as the contractual representative of the Lenders with only those duties as are expressly set forth in this Agreement and the other Loan Documents. In its capacity as the Lenders’ contractual representative, the Administrative Agent (i) does not hereby assume any fiduciary duties to any of the Lenders, (ii) is a “representative” of the Lenders within the meaning of the term “secured party” as defined in the Oklahoma Uniform Commercial Code, and (iii) is acting as an independent contractor, the rights and duties of which are limited to those expressly set forth in this Agreement and the other Loan Documents. Each of the Lenders hereby agrees to assert no claim against the Administrative Agent on any agency theory or any other theory of liability for breach of fiduciary duty, all of which claims each Lender hereby waives.

13.2 Powers . The Administrative Agent will have and may exercise such powers under the Loan Documents as are specifically delegated to the Administrative Agent by the terms of each thereof, together with such powers as are reasonably incidental thereto. The Administrative Agent has no implied duties to the Lenders, or any obligation to the Lenders to take any action thereunder except any action specifically provided by the Loan Documents to be taken by the Administrative Agent.

13.3 General Immunity . Neither the Administrative Agent nor any of its directors, officers or employees will be liable to the Credit Parties, the Lenders or any Lender for any action taken or omitted to be taken by it or them hereunder or under any other Loan Document or in connection herewith or therewith except to the extent such action or inaction is determined in a final non-appealable judgment by a court of competent jurisdiction to have arisen from the gross negligence or willful misconduct of such Person provided that nothing in this Section 13.3 is intended to impair or otherwise limit (i) the rights of the Credit Parties to make claims against the LC Issuer for damages as contemplated by either proviso (ii) to the first sentence of Section 2.19.6 or proviso (y) to the penultimate sentence of Section 2.19.9 or (ii) the liabilities of the LC Issuer or the Administrative Agent to the Credit Parties based on a standard of care otherwise expressly designated or stipulated to in other provisions of this Agreement.

13.4 No Responsibility for Loans, Recitals . Neither the Administrative Agent nor any of its directors, officers or employees will be responsible for or have any duty to ascertain, inquire into, or verify (a) any statement, warranty or representation made in connection with any Loan Document or any borrowing hereunder; (b) the performance or observance of any of the covenants or agreements of any obligor under any Loan Document, including, without limitation, any agreement by an obligor to furnish information directly to each Lender; (c) the satisfaction of any condition specified in Article 4, except receipt of items required to be delivered solely to the Administrative Agent; (d) the existence or possible existence of any Default; (e) the validity, enforceability, effectiveness, sufficiency or genuineness of any Loan Document or any other instrument or writing furnished in connection therewith; (f) the value, sufficiency, creation, perfection or priority of any Lien in any collateral security; or (g) the financial condition of the Credit Parties or any Subsidiary Guarantor of any of the Obligations or of any of the Credit Parties’ or any such Subsidiary Guarantor ‘s respective Subsidiaries. The Administrative Agent has no duty to disclose to the Lenders information that is not required to be furnished by the Credit Parties to the Administrative Agent at such time, but is voluntarily furnished by the Credit Parties to the Administrative Agent (either in its capacity as Administrative Agent or in its individual capacity).

13.5 Action on Instructions of Lenders . The Administrative Agent will in all cases be fully protected in acting, or in refraining from acting, hereunder and under any other Loan Document in accordance with written instructions executed by the Required Lenders, and such instructions and any action taken or failure to act pursuant thereto will be binding on all of the Lenders. The Lenders hereby acknowledge that the Administrative Agent will be under no duty to take any discretionary action permitted to be taken by it under the provisions of this Agreement or any other Loan Document unless it is requested in writing to do so by the Required Lenders. The Administrative Agent will be fully justified in failing or refusing to take any action hereunder and under any other Loan Document unless it is first indemnified to its satisfaction by the Lenders pro rata against any and all liability, cost and expense that it may incur by reason of taking or continuing to take any such action.

13.6 Employment of Administrative Agents; Counsel; Reliance . The Administrative Agent may assign any of its duties as Administrative Agent under any Loan Document by or through employees, agents, and attorneys-in-fact and is not answerable to the Lenders, except as to money or securities received by it or its authorized agents, for the default or misconduct of any agents or attorneys-in-fact selected by it with reasonable care. The Administrative Agent will be entitled to advice of counsel concerning the contractual arrangement between the Administrative Agent and the Lenders and all matters pertaining to the Administrative Agent’s duties under any Loan Document. The Administrative Agent will be entitled to rely on any Note, notice, consent, certificate, affidavit, letter, telegram, statement, paper or document believed by it to be genuine and correct and to have been executed or sent by the proper Person or Persons, and, in respect to legal matters, on the opinion of counsel selected by the Administrative Agent, which counsel may be employees of the Administrative Agent.

13.7 Administrative Agent’s Reimbursement and Indemnification . The Lenders agree to reimburse and indemnify the Administrative Agent ratably in proportion to their respective Commitments (or, if the Commitments have been terminated, in proportion to their Commitments immediately prior to such termination) (i) for any amounts not reimbursed by the Borrowers for which the Administrative Agent is entitled to reimbursement by the Borrowers under the Loan Documents, (ii) for any other expenses incurred by the Administrative Agent on behalf of the Lenders, in connection with the preparation, execution, delivery, administration and enforcement of the Loan Documents (including, without limitation, for any expenses incurred by the Administrative Agent in connection with any dispute between the Administrative Agent and any Lender or between two or more of the Lenders) and (iii) for any liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, expenses or disbursements of any kind and nature whatsoever which may be imposed on, incurred by or asserted against the Administrative Agent in any way relating to or arising out of the Loan Documents or any other document delivered in connection therewith or the transactions contemplated thereby (including, without limitation, for any such amounts incurred by or asserted against the Administrative Agent in connection with any dispute between the Administrative Agent and any Lender or between two or more of the Lenders), or the enforcement of any of the terms of the Loan Documents or of any such other documents, provided that (i) no Lender will be liable for any of the foregoing to the extent any of the foregoing is found in a final non-appealable judgment by a court of competent jurisdiction to have resulted from the gross negligence or willful misconduct of the Administrative Agent and (ii) any indemnification required under Section 3.3 will, notwithstanding the provisions of this Section 13.7, be paid by the relevant Lender in accordance with the provisions thereof. The obligations of the Lenders under this Section 13.7 will survive payment of the Obligations and termination of this Agreement.

13.8 Notice of Default . The Administrative Agent will not be deemed to have knowledge or notice of the occurrence of any Default or Event of Default under this Agreement unless the Administrative Agent has received written notice from a Lender or the Borrowers referring to this Agreement describing such Default or Event of Default and stating that such notice is a “notice of default.” In the event that the Administrative Agent receives such a notice, the Administrative Agent will give prompt notice thereof to the Lenders.

13.9 Rights as a Lender . In the event the Administrative Agent is a Lender, the Administrative Agent will have the same rights and powers hereunder and under any other Loan Document with respect to its Commitment and its Loans as any Lender and may exercise the same as though it were not the Administrative Agent, and the term “Lender” or “Lenders” will, at any time when the Administrative Agent is a Lender, unless the context otherwise indicates, include the Administrative Agent in its individual capacity. The Administrative Agent and its Affiliates may accept deposits from, lend money to, and generally engage in any kind of banking, financial advisory, trust, Indebtedness, equity or other transaction without notice to or consent of the Lenders, in addition to those contemplated by this Agreement or any other Loan Document, with the Credit Parties in which the Credit Parties are not restricted hereby from engaging with any other Person.

13.10 Lender Credit Decision . Each Lender acknowledges that it has, independently and without reliance on the Administrative Agents, the Syndication Agents or any other Lender and based on the financial statements prepared by the Credit Parties and such other documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Agreement and the other Loan Documents. Each Lender also acknowledges that it will, independently and without reliance on the Administrative Agent, the Syndication Agents or any other Lender and based on such documents and information as it deems appropriate at the time, continue to make its own credit decisions in taking or not taking action under this Agreement and the other Loan Documents.

13.11 Successor Administrative Agent . The Administrative Agent may resign at any time by giving written notice thereof to the Lenders and Unit, such resignation to be effective on the appointment of a successor Administrative Agent or, if no successor Administrative Agent has been appointed, 45 days after the retiring Administrative Agent gives notice of its intention to resign. The Administrative Agent may be removed at any time with or without cause by written notice received by the Administrative Agent from the Required Lenders, such removal to be effective on the date specified by the Required Lenders. On any such resignation or removal, the Required Lenders will have the right to appoint, on behalf of the Credit Parties and the Lenders, a successor Administrative Agent. If no successor Administrative Agent will have been so appointed by the Required Lenders within thirty days after the resigning Administrative Agent’s giving notice of its intention to resign, then the resigning Administrative Agent may appoint, on behalf of the Credit Parties and the Lenders, a successor Administrative Agent. Notwithstanding the previous sentence, the Administrative Agent may at any time without the consent of the Credit Parties or any Lender, appoint any of its Affiliates which is a commercial bank as a successor Administrative Agent hereunder. If the Administrative Agent has resigned or been removed and no successor Administrative Agent has been appointed, the Lenders may perform all the duties of the Administrative Agent hereunder and the Borrowers will make all payments in respect of the Obligations to the applicable Lender and for all other purposes will deal directly with the Lenders. No successor Administrative Agent will be deemed to be appointed hereunder until such successor Administrative Agent has accepted the appointment. Any such successor Administrative Agent will be a commercial bank having capital and retained earnings of at least $100,000,000. On the acceptance of any appointment as Administrative Agent hereunder by a successor Administrative Agent, such successor Administrative Agent will thereupon succeed to and become vested with all the rights, powers, privileges and duties of the resigning or removed Administrative Agent. On the effectiveness of the resignation or removal of the Administrative Agent, the resigning or removed Administrative Agent will be discharged from its duties and obligations hereunder and under the Loan Documents. After the effectiveness of the resignation or removal of an Administrative Agent, the provisions of this Article 13 will continue in effect for the benefit of such Administrative Agent in respect of any actions taken or omitted to be taken by it while it was acting as the Administrative Agent hereunder and under the other Loan Documents.

13.12 Syndication Agents ; Other Agents; Arrangers . No Lender identified on the facing page or signature pages of this Agreement as a Co-Syndication Agent, Documentation Agent, “arranger” or “bookrunner” will have any right, power, obligation, liability, responsibility or duty under this Agreement other than those applicable to all Lenders as such. Without limiting the foregoing, no Lender so identified will have or be deemed to have a fiduciary relationship with any other Lender. Each Lender hereby makes the same acknowledgments with respect to such Lenders as it makes with respect to the Administrative Agent in Section 13.10 and acknowledges that is has note relied, and will not rely, on any of the Lenders so identified in deciding to enter into this Agreement or in taking or not taking any action hereunder.

13.13 Delegation to Affiliates . The Borrowers and the Lenders agree that the Administrative Agent may delegate any of its duties under this Agreement to any of its Affiliates. Any Affiliate of the Administrative Agent which performs duties in connection with this Agreement will be entitled to the same benefits of the indemnification, waiver and other protective provisions to which the Administrative Agent is entitled under Articles 12 and 13.

ARTICLE 14

BENEFIT OF AGREEMENT; ASSIGNMENTS; PARTICIPATIONS

14.1 Successors and Assigns . The terms and provisions of the Loan Documents will be binding on and inure to the benefit of the Credit Parties which are parties thereto and the Lenders and their respective successors and assigns permitted hereby, except that (i) the Credit Parties will not have the right to assign their rights or obligations under the Loan Documents to which they are parties without the prior written consent of each Lender, (ii) any assignment by any Lender must be made in compliance with Section 14.3, (iii) any transfer by any Lender by participation must be made in compliance with Section 14.2 and (iv) no Lender may assign, or sell a participation to, any Credit Party. Any attempted assignment or transfer by any party not made in compliance with this Section 14.1 will be null and void, unless such attempted assignment or transfer is treated as a participation in accordance with Section 14.3.2. The parties to this Agreement acknowledge that clause (ii) of this Section 14.1 relates only to absolute assignments and this Section 14.1 does not prohibit assignments creating security interests, including, without limitation, any pledge or assignment by any Lender of all or any portion of its rights under this Agreement and any Note to a Federal Reserve Bank; provided, however, that no such pledge or assignment creating a security interest will release the transferor Lender from its obligations hereunder unless and until the parties thereto have complied with the provisions of Section 14.3. The Administrative Agent may treat the Person which made any Loan or which holds any Note as the owner thereof for all purposes hereof unless and until such Person complies with Section 14.3; provided, however, that the Administrative Agent may in its discretion (but will not be required to) follow instructions from the Person which made any Loan or which holds any Note to direct payments relating to such Loan or Note to another Person. Any assignee of the rights to any Loan or any Note agrees by acceptance of such assignment to be bound by all the terms and provisions of the Loan Documents. Any request, authority or consent of any Person, who at the time of making such request or giving such authority or consent is the owner of the rights to any Loan (whether or not a Note has been issued in evidence thereof), will be conclusive and binding on any subsequent holder or assignee of the rights to such Loan.

14.2 Participations .

14.2.1. Permitted Participants; Effect . Any Lender may, in the ordinary course of its business and in accordance with applicable law, at any time on obtaining the prior written consent of the Administrative Agent and Unit, sell to one or more banks or other entities (“ Participants ”) participating interests in any Outstanding Credit Exposure of such Lender, any Note held by such Lender, any Commitment of such Lender or any other interest of such Lender under the Loan Documents. In the event of any such sale by a Lender of participating interests to a Participant, such Lender’s obligations under the Loan Documents will remain unchanged, such Lender will remain solely responsible to the other parties hereto for the performance of such obligations, such Lender will remain the owner of its Outstanding Credit Exposure and the holder of any Note issued to it in evidence thereof for all purposes under the Loan Documents, all amounts payable by the Borrowers under this Agreement will be determined as if such Lender had not sold such participating interests, and the Borrowers and the Administrative Agent will continue to deal solely and directly with such Lender in connection with such Lender’s rights and obligations under the Loan Documents.

14.2.2. Voting Rights . Each Lender will retain the sole right to approve, without the consent of any Participant, any amendment, modification or waiver of any provision of the Loan Documents other than any amendment, modification or waiver with respect to any Credit Extension or Commitment in which such Participant has an interest which would require consent of all of the Lenders under the terms of Section 11.2 or of any other Loan Document.

14.2.3. Benefit of Certain Provisions . The Borrowers agree that each Participant will be deemed to have the right of setoff provided in Section 12.19 in respect of its participating interest in amounts owing under the Loan Documents to the same extent as if the amount of its participating interest were owing directly to it as a Lender under the Loan Documents, provided that each Lender will retain the right of setoff provided in Section 12.19 with respect to the amount of participating interests sold to each Participant. The Lenders agree to share with each Participant, and each Participant, by exercising the right of setoff provided in Section 12.19, agrees to share with each Lender, any amount received under the exercise of its right of setoff, such amounts to be shared in accordance with Section 2.21 as if each Participant were a Lender. The Borrowers further agree that each Participant will be entitled to the benefits of Sections 3.1, 3.2, 3.4 and 3.5 to the same extent as if it were a Lender and had acquired its interest by assignment under Section 14.3, provided that (i) a Participant will not be entitled to receive any greater payment under Section 3.1, 3.2 or 3.5 than the Lender who sold the participating interest to such Participant would have received had it retained such interest for its own account, unless the sale of such interest to such Participant is made with the prior written consent of the Borrowers, and (ii) any Participant agrees to comply with the provisions of Section 3.3 to the same extent as if it were a Lender.

14.3 Assignments .

14.3.1. Permitted Assignments . Any Lender may, in the ordinary course of its business and in accordance with applicable law, at any time assign to one or more banks or other entities other than any Credit Party (“ Purchasers “) all or any part of its rights and obligations under the Loan Documents. Such assignment will be substantially in the form of Exhibit C or in such other form as may be agreed to by the parties thereto. The consent of Unit, the Administrative Agent and the LC Issuer will be required prior to an assignment becoming effective with respect to a Purchaser which is not a Lender or an Affiliate thereof; provided, however, that if a Default, Event of Default or Deficiency has occurred and is continuing, the consent of the Unit will not be required. Such consent of Unit will not be unreasonably withheld or delayed. Each such assignment with respect to a Purchaser which is not a Lender or an Affiliate thereof will (unless each of the Credit Parties and the Administrative Agent otherwise consent) be in an amount not less than the lesser of (i) $15,000,000 or (ii) the remaining amount of the assigning Lender’s Commitment (calculated as at the date of such assignment) or outstanding Loans (if the applicable Commitment has been terminated).

14.3.2. Effect; Effective Date . On (i) delivery to the Administrative Agent of a notice of assignment, substantially in the form attached as Exhibit I to Exhibit C (a “ Notice of Assignment “), together with any consents required by Section 14.3.1, and (ii) payment of a $2,500 fee to the Administrative Agent for processing such assignment, such assignment will become effective on the effective date specified in such Notice of Assignment. The Notice of Assignment will contain a representation by the Purchaser to the effect that none of the consideration used to make the purchase of the Commitment and Outstanding Credit Exposure under the applicable assignment agreement are “plan assets” as defined under ERISA and that the rights and interests of the Purchaser in and under the Loan Documents will not be “plan assets” under ERISA. On and after the effective date of such assignment, such Purchaser will for all purposes be a Lender to this Agreement and any other Loan Document executed by or on behalf of the Lenders and will have all the rights and obligations of a Lender under the Loan Documents, to the same extent as if it were an original party hereto, and no further consent or action by the Credit Parties, the Lenders or the Administrative Agent will be required to release the transferor Lender with respect to the percentage of the Total Commitment and Outstanding Credit Exposure assigned to such Purchaser. On the consummation of any assignment to a Purchaser under this Section 14.3.2, the transferor Lender, the Administrative Agent and the Borrowers will, if the transferor Lender or the Purchaser desires that its Loans be evidenced by Notes, make appropriate arrangements so that new Notes or, as appropriate, replacement Notes are issued to such transferor Lender and new Notes or, as appropriate, replacement Notes, are issued to such Purchaser, in each case in principal amounts reflecting their respective Commitments, as adjusted under such assignment.

14.3.3. Register . The Administrative Agent, acting solely for this purpose as an Administrative Agent of the Borrowers, will maintain at its main banking offices in Tulsa, Oklahoma, a copy of each Assignment and Assumption delivered to it and a register for the recordation of the names and addresses of the Lenders, and the Commitments of, and principal amounts of the Loans owing to, each Lender under the terms hereof from time to time (the “ Register “). The entries in the Register will be conclusive, and the Borrowers, the Administrative Agent and the Lenders may treat each Person whose name is recorded in the Register under the terms hereof as a Lender hereunder for all purposes of this Agreement, notwithstanding notice to the contrary. The Register will be available for inspection by the Borrowers and any Lender, at any reasonable time and from time to time on reasonable prior notice.

14.4 Dissemination of Information . Subject to the confidentiality requirements of this Agreement, the Borrowers authorize each Lender to disclose to any Participant or Purchaser or any other Person acquiring an interest in the Loan Documents by operation of law (each a “ Transferee “) and any prospective Transferee any and all information in such Lender’s possession concerning the creditworthiness of the Credit Parties and their Subsidiaries, including without limitation any information contained in any reports provided to Administrative Agent; provided that each Transferee and prospective Transferee agrees to be bound by this Agreement.

14.5 Tax Treatment . If any interest in any Loan Document is transferred to any Transferee, the transferor Lender will cause such Transferee, concurrently with the effectiveness of such transfer, to comply with the provisions of Section 3.3(iv).

14.6 Procedure for Increases and Additional Lenders . In the event that neither (i) a Default, an Event of Default or a Deficiency has occurred and remains uncured hereunder nor (ii) a Default, an Event of Default or a Deficiency would be caused by or result from the Borrowers’ exercise of the provisions of this Section 14.6, Unit, on behalf of the Borrowers may from time to time after the date of this Agreement request in writing to the Administrative Agent and each of the Lenders specified increases (an “ Increase Request “) in the Lenders’ Total Commitment above $250,000,000 or the then applicable Total Commitment amount (but in no event shall any such Increase Requests cause the Total Commitment amount to exceed the lesser of the Maximum Credit Amount or Borrowing Base then in effect), subject to the following terms, provisions, conditions and limitations:

14.6.1. Minimum Increased Amount . The minimum amount of each increase in the Total Commitment requested by Unit in writing as set forth above shall be not less than $25,000,000 and $5,000,000 integrals in excess thereof. Such written request shall also specify the proposed effective date of such Increase Request.

14.6.2. Existing Lenders or Additional Lenders . In order to effect an Increase Request of the Total Commitments, the Borrowers shall: (i) obtain an agreement with one or more existing Lenders signatory party hereto to increase its or their Commitment(s) in an total minimum amount of $25,000,000 and in minimum multiple increments in excess thereof of $5,000,000; and/or (ii) provided, if one or more of the existing Lenders elects not to increase its Commitment (or increases its Commitment by an amount less than the Pro Rata Share of the requested increased in the Total Commitments), request any one or more other banking or lending institutions to become parties to this Agreement and agree to issue Commitment(s) such that the total increased amount of the Total Commitment Complies with Section 14.6.1; provided that such one or more other banking or lending institutions are reasonably acceptable to the Administrative Agent and become parties to the Agreement by executing an Increase Request Agreement in the form of Exhibit “D” annexed hereto (the Lenders or other banking institutions that agree to issue such a new or increased Commitment being referred to herein as the “ Additional Lenders ”). Administrative Agent shall have a period of five (5) days from receipt of written notification from Borrowers of the name of any financial institution that shall have agreed to become an Additional Lender in which to consent or withhold consent to the admission of any one or more proposed Additional Lender(s) (which such consent not to be unreasonably withheld or delayed.

14.6.3. Additional Documentation . Borrowers shall executed and deliver to the Administrative Agent such replacement or additional Notes, closing opinions and other loan documents and certificates as may be deemed reasonably necessary or appropriate by the Administrative Agent in connection with the consummation of each Increase Request.

14.6.4. Legal Fees and Expenses . Borrowers shall pay to the Administrative Agent the reasonable legal fees and expenses incurred by the Administrative Agent in connection with the consummation of each Increase Request.

14.6.5. Conditions to Effectiveness of Increase Request . Notwithstanding the foregoing, no Increase Request under this Section 14.6 will be effective with respect to any Lender or Additional Lender unless:

(a) no Default, Event of Default or Deficiency shall have occurred and be continuing on the date of such Increase Request and after giving effect thereto;

(b) the representations and warranties contained in this Agreement are true and correct in all material respects on and as of the date of such Increase Request and after giving effect thereto, as though made on and as of such date (or, if any such representation or warranty is expressly stated to have been made as of a specific date, as of such specific date);

(c) each Additional Lender shall have executed and delivered to the Administrative Agent the Increase Request Agreement and such other documents as the Administrative Agent shall have reasonably required in order for it to subscribe to the terms and conditions of this Agreement and the other Loan Documents;

(d) the secretary or assistant secretary of Unit shall have provided to the Administrative Agent a certified copy of directors’ resolutions authorizing such increase in the Total Commitment and the outstanding Loans shall have been reallocated ratably among the Lenders (including the Additional Lenders) after giving effect to such increase;

(e) all legal matters incident to such increase and the admission of any Additional Lenders under this Agreement shall be reasonably satisfactory to the Administrative Agent and its legal counsel;

(f) the Borrowers shall pay any fees required under Article 2 and this Section 14.6, and for all losses, expenses and liabilities incurred by any Lender in connection with the reallocation of any outstanding Eurodollar Loans; and

(g) Within fifteen (15) days after Unit’s delivery of the Increase Request, Borrowers obtain approval from the Lenders to so increase their Commitment and/or secures Commitment(s) from Additional Lenders for the full amount of the Increase Request, otherwise, the Increase Request shall become effective only to the extent of the increased or new Commitments actually obtained.

ARTICLE 15

NOTICES/CONSENTS

15.1 Notices . Except as otherwise permitted by Section 2.9 with respect to Borrowing Notices and except for other communications expressly permitted to be given in accordance with Section 15.5, all notices, requests and other communications to any party hereunder will be in writing (including facsimile transmission or similar writing) and will be given to such party: (x) in the case of the Borrowers, the Administrative Agent and existing Lenders signatory parties hereto, at its address or facsimile number set forth on the signature pages hereof, (y) in the case of any future or additional Lender, at its address or facsimile number set forth on the Lenders Schedule or the executed Exhibit D pertaining thereto or (z) in the case of any party, at such other address or facsimile number as such party may hereafter specify for the purpose by notice to the Administrative Agent and the Borrowers in accordance with the provisions of this Section 15.1. Each such notice, request or other communication will be effective (i) if given by facsimile transmission, when transmitted to the facsimile number specified in this Section and confirmation of receipt is received, (ii) if given by mail, 72 hours after such communication is deposited in the mails with first class postage prepaid, addressed as aforesaid, or (iii) if given by any other means, when delivered at the address specified in this Section; provided that notices to the Administrative Agent under Article 2 will not be effective until received.

15.2 Change of Address . The Borrowers, the Administrative Agent and any Lender (i) may each change the address for service of notice on it by a notice in writing to the other parties hereto and (ii) will give such a notice if its address will change.

15.3 Consent to Amendments . To the extent any Notes are issued under this Agreement, each holder of any of the Notes at the time or thereafter outstanding will be bound by any consent authorized by Section 11.2, whether or not the Notes will have been marked to indicate such consent, but any Notes issued thereafter may bear a notation referring to any such consent. No course of dealing between the Credit Parties and any holder of any of the Notes nor any delay in exercising any rights hereunder or under the Notes will operate as a waiver of any rights of any holder of any of the Notes. As used herein and in the Notes, the term “this Agreement” and references thereto will mean this Agreement as it may from time to time be amended, modified or supplemented.

15.4 USA PATRIOT Act Notice . To help the government fight the funding of terrorism and money laundering activities, federal law requires all financial institutions to obtain, verify, and record information that identifies each person or entity that opens an account, including any deposit account, treasury management account, loan, other extension of credit, or other financial services product. Each Lender that is subject to the requirements of the USA PATRIOT Act, Pub. L. No. 107-56 hereby notifies each Borrower of the following: When a Borrower opens an account, the Lender will ask for the Borrower’s name, address, tax identification number, and other information that will allow the Lender to identify the Borrower. The Lender will verify and record the information the Lender obtains from the Borrower under the USA PATRIOT Act, and will maintain and retain that record in accordance with the regulations promulgated under the USA PATRIOT Act.

15.5 Electronic Communications . Notices and other communications to the Lenders and the LC Issuer hereunder may be delivered or furnished by electronic communication (including e-mail and Internet or Intranet websites) pursuant to procedures approved by the Administrative Agent, provided that the foregoing shall not apply to notices to any Lender or the LC Issuer pursuant to Article 2 if such Lender or the LC Issuer, as applicable, has notified the Administrative Agent that it is incapable of receiving notices under such Article by electronic communication. The Administrative Agent or Borrower may, in its discretion, agree to accept notices and other communications to it hereunder by electronic communications pursuant to procedures approved by it, provided that approval of such procedures may be limited to particular notices or communications. Unless the Administrative Agent otherwise prescribes, (i) notices and other communication sent to an e-mail shall be deem received upon the sender’s receipt of an acknowledgement from the intended recipient (such as by the “return receipt requested” function, as available, return e-mail or other written acknowledgement), provided that is such notice or other communication is not sent during normal business hours of the recipient on the next business day for the recipient, such notice or communication shall be deemed to have been sent at the opening of business on the next business day for the recipient, and (ii) notices or communications posted to an internet or intranet website shall be deemed received by the intended recipient at its e-mail address as described in the foregoing clause (i) of notification that such notice or communication is available and identifying the website address thereof.

ARTICLE 16

COUNTERPARTS

16.1 Counterparts . This Agreement may be executed in any number of counterparts, all of which taken together will constitute one agreement, and any of the parties hereto may execute this Agreement by authenticating any such counterpart. This Agreement will be effective when it has been executed by the Borrowers, the Administrative Agent, the LC Issuer and the Lenders and each party has notified the Administrative Agent by facsimile transmission or electronic transmission (e-mail) that it has taken such action. All closing documents will be furnished to the Administrative Agent with sufficient counterparts so that the Administrative Agent may furnish one to each of the Lenders.

ARTICLE 17

CHOICE OF LAW; CONSENT TO JURISDICTION; WAIVER OF JURY TRIAL

17.1 Choice of Law . THE LOAN DOCUMENTS (OTHER THAN THOSE CONTAINING A CONTRARY EXPRESS CHOICE OF LAW PROVISION) WILL BE CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF OKLAHOMA, BUT GIVING EFFECT TO FEDERAL LAWS APPLICABLE TO NATIONAL BANKS AND WILL BE DEEMED TO HAVE BEEN MADE OR INCURRED UNDER THE LAWS OF THE STATE OF OKLAHOMA EXCEPT ONLY WHERE THE APPLICABLE REMEDIAL OR PROCEDURAL LAWS OF OTHER JURISDICTIONS IN WHICH PORTIONS OF THE COLLATERAL ARE SITUATED ARE APPLICABLE THERETO .

17.2 Consent to Jurisdiction . THE BORROWERS, THE ADMINISTRATIVE AGENT AND LENDERS HEREBY IRREVOCABLY SUBMIT TO THE NON-EXCLUSIVE JURISDICTION OF ANY UNITED STATES FEDERAL OR OKLAHOMA STATE COURT SITTING IN TULSA, OKLAHOMA IN ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO ANY LOAN DOCUMENTS AND THE BORROWERS, THE ADMINISTRATIVE AGENT AND LENDERS HEREBY IRREVOCABLY AGREES THAT ALL CLAIMS IN RESPECT OF SUCH ACTION OR PROCEEDING MAY BE HEARD AND DETERMINED IN ANY SUCH COURT AND IRREVOCABLY WAIVES ANY OBJECTION IT MAY NOW OR HEREAFTER HAVE AS TO THE VENUE OF ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN SUCH A COURT OR THAT SUCH COURT IS AN INCONVENIENT FORUM. NOTHING HEREIN WILL LIMIT THE RIGHT OF THE ADMINISTRATIVE AGENT, THE LC ISSUER OR ANY LENDER TO BRING PROCEEDINGS AGAINST THE BORROWERS IN THE COURTS OF ANY OTHER JURISDICTION.

17.3 No Oral Agreements . THE LOAN DOCUMENTS EMBODY THE ENTIRE AGREEMENT AND UNDERSTANDING BETWEEN THE PARTIES AND SUPERSEDE ALL OTHER AGREEMENTS AND UNDERSTANDINGS BETWEEN SUCH PARTIES RELATING TO THE SUBJECT MATTER HEREOF AND THEREOF, THE LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

17.4 Exculpation Provisions . EACH OF THE PARTIES HERETO SPECIFICALLY AGREES THAT IT HAS A DUTY TO READ THIS AGREEMENT, THE NOTES AND THE LOAN DOCUMENTS AND AGREES THAT IT IS CHARGED WITH NOTICE AND KNOWLEDGE OF THE TERMS OF THIS AGREEMENT, THE NOTES AND THE OTHER LOAN DOCUMENTS; THAT IT HAS IN FACT READ THIS AGREEMENT AND IS FULLY INFORMED AND HAS FULL NOTICE AND KNOWLEDGE OF THE TERMS, CONDITIONS AND EFFECTS OF THIS AGREEMENT; THAT IT HAS BEEN REPRESENTED BY INDEPENDENT LEGAL COUNSEL OF ITS CHOICE THROUGHOUT THE NEGOTIATIONS PRECEDING ITS EXECUTION OF THIS AGREEMENT, THE NOTES AND THE OTHER LOAN DOCUMENTS; AND HAS RECEIVED THE ADVICE OF ITS ATTORNEY IN ENTERING INTO THIS AGREEMENT, THE NOTES AND THE OTHER LOAN DOCUMENTS; AND THAT IT RECOGNIZES THAT CERTAIN OF THE TERMS OF THIS AGREEMENT, THE NOTES AND THE OTHER LOAN DOCUMENTS RESULT IN ONE PARTY ASSUMING THE LIABILITY INHERENT IN SOME ASPECTS OF THE TRANSACTION AND RELIEVING THE OTHER PARTY OF ITS RESPONSIBILITY FOR SUCH LIABILITY. EACH PARTY HERETO AGREES AND COVENANTS THAT IT WILL NOT CONTEST THE VALIDITY OR ENFORCEABILITY OF ANY EXCULPATORY PROVISION OF THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS ON THE BASIS THAT THE PARTY HAD NO NOTICE OR KNOWLEDGE OF SUCH PROVISION OR THAT THE PROVISION IS NOT “CONSPICUOUS.”

17.5 Waiver Of Jury Trial, Punitive Damages, Suretyship Defenses . THE BORROWERS, THE ADMINISTRATIVE AGENT, THE LC ISSUER AND EACH LENDER HEREBY WAIVE TRIAL BY JURY IN ANY JUDICIAL PROCEEDING INVOLVING, DIRECTLY OR INDIRECTLY, ANY MANNER (WHETHER SOUNDING IN TORT, CONTRACT OR OTHERWISE) IN ANY WAY ARISING OUT OF, RELATED TO OR CONNECTED WITH ANY LOAN DOCUMENT OR THE RELATIONSHIP ESTABLISHED THEREUNDER. EACH BORROWER AND EACH LENDER HEREBY FURTHER (A) IRREVOCABLY WAIVE, TO THE MAXIMUM EXTENT NOT PROHIBITED BY LAW, ANY RIGHT IT MAY HAVE TO CLAIM OR RECOVER IN ANY SUCH LITIGATION ANY “SPECIAL DAMAGES,” AS DEFINED BELOW, (B) CERTIFY THAT NO PARTY HERETO NOR ANY REPRESENTATIVE OR AGENT OR COUNSEL FOR ANY PARTY HERETO HAS REPRESENTED, EXPRESSLY OR OTHERWISE, OR IMPLIED THAT SUCH PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVERS, AND (C) ACKNOWLEDGE THAT IT HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT, THE OTHER LOAN DOCUMENTS AND THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS CONTAINED IN THIS SECTION. AS USED IN THIS SECTION, “SPECIAL DAMAGES” INCLUDES ALL SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES (REGARDLESS OF HOW NAMED), BUT DOES NOT INCLUDE ANY PAYMENTS OR FUNDS WHICH ANY PARTY HERETO HAS EXPRESSLY PROMISED TO PAY OR DELIVER TO ANY OTHER PARTY HERETO.

EACH BORROWER UNCONDITIONALLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, (A) NOTICE TO SUCH BORROWER (OTHER THAN UNIT) OF THE INCURRENCE OF ANY OBLIGATIONS, (B) NOTICE TO SUCH BORROWER (OTHER THAN UNIT) OF ANY BREACH OR DEFAULT WITH RESPECT TO THE OBLIGATIONS OR ANY OTHER NOTICE TO SUCH BORROWER THAT MAY BE REQUIRED BY STATUTE, RULE OF LAW OR OTHERWISE, TO PRESERVE ANY RIGHTS OF THE ADMINISTRATIVE AGENT OR THE LENDERS AGAINST SUCH BORROWER, (C) ANY REQUIREMENT OF ADMINISTRATIVE AGENT OR LENDERS TO EXERCISE DILIGENCE OR EXHAUSTION OF REMEDIES OR TO MITIGATE DAMAGES RESULTING FROM ANY DEFAULT UNDER THE LOAN DOCUMENTS, OR (D) SUBROGATION TO ANY RIGHTS (CONTRACTUAL, UNDER THE UNITED STATES BANKRUPTCY CODE OR UNDER COMMON LAW) OF ANY LENDER AGAINST ANOTHER BORROWER OR ANY OTHER CIRCUMSTANCE WHATSOEVER WHICH MIGHT OTHERWISE CONSTITUTE A LEGAL OR EQUITABLE DISCHARGE, RELEASE OR DEFENSE OF SUCH BORROWER AS A SURETY OR WHICH MIGHT OTHERWISE LIMIT RECOURSE AGAINST SUCH BORROWER. THE PROVISIONS OF THIS SECTION 17.5 SHALL SURVIVE THE TERM OF THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS AND THE PAYMENT IN FULL OF THE OBLIGATIONS.

SIGNATURE PAGES TO FOLLOW

IN WITNESS WHEREOF, the Borrowers, the Lenders and the Administrative Agent have executed this Agreement as of the date first above written.

UNIT CORPORATION , a Delaware corporation,

SUPERIOR PIPELINE COMPANY, L.L.C. ,

an Oklahoma limited liability company,

UNIT PETROLEUM COMPANY , an Oklahoma

corporation,

UNIT DRILLING COMPANY , an Oklahoma

corporation,

SUPERIOR PIPELINE TEXAS, L.L.C.,

an Oklahoma limited liability company,

SUPERIOR APPALACHIAN PIPELINE, L.L.C., an Oklahoma limited liability company,

and

UNIT TEXAS DRILLING, L.L.C. , an Oklahoma

limited liability company

By_____________________________________

Larry D. Pinkston, as President of

UNIT CORPORATION,

UNIT PETROLEUM COMPANY, and

UNIT DRILLING COMPANY, and

as Chairman of SUPERIOR PIPELINE COMPANY, L.L.C,

and as manager of

SUPERIOR PIPELINE TEXAS, L.L.C.,

SUPERIOR APPALACHIAN PIPELINE, L.L.C., and

UNIT TEXAS DRILLING, L.L.C.

7130 South Lewis Avenue, Suite 1000

Tulsa, Oklahoma 74136

Telephone: (918) 493-7700

Facsimile (918) 493-7711

Attention: Larry D. Pinkston

Agreed to by the undersigned Existing Subordinated Note Indenture Additional Parties as to Section 7.1 and any other terms, provisions and covenants expressly applicable thereto:

UNIT PETROLEUM COMPANY ,

UNIT TEXAS COMPANY ,

UNIT DRILLING AND EXPLORATION COMPANY ,

and

PETROLEUM SUPPLY COMPANY,

By_____________________________________

Mark E. Schell, Senior Vice President

UNIT DRILLING USA COLUMBIA, L.L.C.,

UNIT DRILLING COLUMBIA, L.L.C.,

and

PRESTON COUNTY GAS GATHERING, L.L.C.

By_____________________________________

Mark E. Schell, Senior Vice President

BOKF, NA, dba Bank of Oklahoma, as LC Issuer, as Administrative Agent, and as a Lender

By__________________________________

Pam Schloeder

Senior Vice President

101 East Second Street

Bank of Oklahoma Tower -8 th floor/Energy Department

One Williams Center

Tulsa, Oklahoma 74172

Telephone: (918) 588-6012

Facsimile: (918) 588-6880

COMPASS BANK , a Lender

By___________________________________

Kathleen J. Bowen

Senior Vice President

24 Greenway Plaza

Suite 1400A

Houston, Texas 77046

Telephone: (713) 968-8273

Facsimile: (713) 499-8722

BANK OF AMERICA, N.A. , a Lender

By__________________________________

Chris Renyi

Vice President

100 Federal Street, MA 5-100-09-01

Boston, MA 02110

Telephone: (617) 434-2079

Facsimile: (617) 434-3652

BMO HARRIS FINANCING, INC., a Lender

By_________________________________

Kevin Utsey

Director

BMO Capital Markets/Houston Agency

700 Louisiana Street, Suite 2100

Houston, Texas 77002

Telephone: (713) 546-9720

Facsimile: (713 223-4007

BNP Paribas, a Lender

By_________________________________

Johnnie Etheridge

Assistant Vice President

1200 Smith Street

Suite 3100

Houston, Texas 77002

Telephone: (201) 850-6378

Facsimile: (214) 754-5982

COMERICA BANK, a Lender

By_________________________________

John S. Lesikar,

Assistant Vice President

1717 Main Street

Dallas, Texas 75201

Telephone: (214) 462-4341

CREDIT AGRICOLE CORPORATE AND INVESTMENT BANK a Lender

By_________________________________

_____________________(name)

_____________________(title)

By_________________________________

_____________________(name)

_____________________(title)

1300 Main Street

Suite 2100

Houston, Texas 77002

Telephone: (713) 890-8617

EXHIBIT A

FORM OF PROMISSORY NOTE

( )

$____________ September [__], 2011

Tulsa, Oklahoma

FOR VALUE RECEIVED, the undersigned, UNIT CORPORATION, a Delaware corporation, SUPERIOR PIPELINE COMPANY, L.L.C., an Oklahoma limited liability company, UNIT DRILLING COMPANY, an Oklahoma corporation, UNIT PETROLEUM COMPANY, an Oklahoma corporation, UNIT TEXAS DRILLING, L.L.C., an Oklahoma limited liability company, SUPERIOR PIPELINE TEXAS, L.L.C., an Oklahoma limited liability company, and SUPERIOR APPALACHIAN PIPELINE, L.L.C., an Oklahoma limited liability company (individually and collectively the "Borrowers"), jointly and severally promise to pay to the order of ______________________ ("____"), with interest, the principal sum of ________________________ and NO/100ths DOLLARS ($____________) or, if less, the aggregate principal amount of all advances outstanding from time to time hereunder, made by ______ to Borrowers pursuant to the Credit Agreement (hereinafter defined) and unless otherwise provided in the Credit Agreement, the principal balance of this Note outstanding on the Facility Termination Date, with interest payments due on each applicable Payment Date. This Note is issued pursuant to and subject to the terms of a certain Senior Credit Agreement dated as of September 13, 2011, among Borrowers, the Lenders signatory parties thereto (collectively the "Lenders"), with BOKF, NA dba Bank of Oklahoma, formerly Bank of Oklahoma, National Association, as the Administrative Agent for the Lenders (in such capacity, the "Administrative Agent") (such Credit Agreement, as hereafter amended, modified, supplemented or restated from time to time collectively referred to as the "Credit Agreement"). Capitalized terms used and not otherwise defined herein shall have the meanings assigned to them in the Credit Agreement.

Except as hereinafter provided in connection with a Default, interest shall accrue on the outstanding principal balance hereof and on any past due interest to the Facility Termination Date at the rate or rates per annum determined pursuant to the Pricing Schedule annexed to the Credit Agreement, as provided in and calculated pursuant to the Credit Agreement.

The rate of interest payable upon the indebtedness evidenced by this Note shall not at any time exceed the maximum rate of interest permitted under the laws of the State of Oklahoma or federal laws to the extent they apply to loans of the type and character evidenced by this Note.

All payments under this Note shall be made in legal tender of the United States of America or in other immediately available funds at the offices of the Administrative Agent at Bank of Oklahoma Tower, One Williams Center, Seven East Second Street, Tulsa, Oklahoma 74172, and no credit shall be given for any payment received by check, draft or other instrument or item until such time as the Administrative Agent or the holder hereof shall have received credit therefor from the Administrative Agent's or the holder's collecting agent or, in the event no collecting agent is used, from the bank or other financial institution upon which said check, draft or other instrument or item is drawn. If any payment is due upon a Saturday or Sunday or upon any other day on which state or national banks in the State of Oklahoma are closed for business by virtue of a legal holiday for such banks, such payment shall be due and payable on the next succeeding Business Day, and interest shall accrue to such day.

The Borrowers may borrow and reborrow hereunder at any time and from time to time as provided in the Credit Agreement and may prepay this Note in whole or in part, subject to the prepayment limitations contained in the Credit Agreement; provided, however, that any partial prepayment shall be applied first to accrued interest, then to the unpaid principal balance hereof.

From time to time the Borrowers and the Lenders may agree to extend the maturity date of this Note or to renew this Note, in whole or in part, or a new note of different form may be substituted for this Note and/or the rate of interest may be changed, or changes may be made in consideration of loan extensions, and the holder, from time to time, may waive or surrender, either in whole or in part, any rights, guarantees, security interests, or liens given for the benefit of the holder in connection with the payment and the securing the payment of this Note; but no such occurrences shall in any manner affect, limit, modify or otherwise impair any rights, guarantees or security of the holder not specifically waived, released or surrendered in writing, nor shall the Borrowers or any guarantor, endorser or any other person who is or might be liable hereon, either primarily or contingently, be released from such liability by reason of the occurrence of any such event. The holder hereof, from time to time, shall have the unlimited right to release any person who might be liable hereon; and such release shall not affect or discharge the liability of any other person who is or might be liable hereon.

This Note is subject to and governed by the terms, provisions, conditions and limitations of the Credit Agreement concerning, among other matters, acceleration following a Default, imposition of default rates of interest during the continuance of a Default, methods of payment, minimum amounts of each Advance, selection of the type of Advance and applicable Interest Period for new Advances, Borrowing Base calculations, Maximum Credit Amount, Aggregate Commitment amounts, a negative pledge of certain assets of the Borrowers, rights of set off or offset in connection therewith and all other matters terms, provisions and agreements therein prescribed or governed.

The Borrowers and all endorsers, guarantors and sureties hereby severally waive protest, presentment, demand, and notice of protest and nonpayment in case this Note or any payment due hereunder is not paid when due; and they agree to any renewal of this Note or to any extension, acceleration or postponement of the time of payment, or any other indulgence, to any substituting, exchange or release of collateral and to the release of any party or person primarily or contingently liable hereon without prejudice to the holder and without notice to the Borrowers or any endorser, guarantor or surety. In the event of any controversy, claim or dispute among the parties affecting or relating to the subject matter or performance of this Note, the prevailing party shall be entitled to recover from the non-prevailing party all of its reasonable costs, expenses, including reasonable attorneys' and accountants' fees. In the event the Administrative Agent or Lenders are the prevailing party(ies), the Borrowers, and any guarantor, endorser, surety or any other person who is or may become liable hereon, will, on demand, pay all such costs and expenses.

[This Note is a replacement and modification of that certain promissory note dated as of May 24, 2008, issued under the Existing Credit Agreement and payable by the Borrowers to the order of _______ in the original principal amount of $__________.]

This Note is issued by the Borrowers in accordance with the provisions of Section 2.7.5 of the Credit Agreement and shall be governed by and construed in accordance with the laws of the State of Oklahoma. Borrowers agree that all suits or proceedings arising from or related to this Note or the Credit Agreement may be litigated in courts, state or federal, sitting in Tulsa County, State of Oklahoma. In furtherance of this provision, Borrowers hereby waive any objection to such venue.

Notwithstanding the single execution of this Note by the undersigned President of each of the corporate Borrowers and the manager of the limited liability companies Borrower, as applicable, each of the Borrowers is jointly and severally bound by the terms of this Note.

UNIT CORPORATION , a Delaware corporation,

SUPERIOR PIPELINE COMPANY, L.L.C. ,

an Oklahoma limited liability company,

UNIT PETROLEUM COMPANY , an Oklahoma

corporation,

UNIT DRILLING COMPANY , an Oklahoma

corporation,

UNIT TEXAS DRILLING, L.L.C. , an Oklahoma

limited liability company,

S UPERIOR PIPELINE TEXAS, L.L.C. , an Oklahoma limited liability company, and

SUPERIOR APPALACHIAN PIPELINE, L.L.C. , an Oklahoma limited liability company

By_____________________________________

Larry D. Pinkston, President of each of UNIT CORPORATION,

UNIT PETROLEUM COMPANY,

UNIT DRILLING COMPANY, and

as Manager of UNIT TEXAS DRILLING, L.L.C., and Chairman of SUPERIOR PIPELINE COMPANY, L.L.C.

EXHIBIT B

COMPLIANCE CERTIFICATE

BOKF, NA dba Bank of Oklahoma, as

Administrative Agent

Bank of Oklahoma Tower – 8 th Floor/Energy Dept.

One Williams Center

Tulsa, Oklahoma 74192

This Compliance Certificate is delivered pursuant to Section 6.1(iii) of that certain Senior Credit Agreement, dated as of September 13, 2011 (as amended, modified, supplemented or restated from time to time, the "Credit Agreement"), by and among Unit Corporation, a Delaware corporation ("Unit") ("Unit" and the subsidiaries thereof signatory parties to the Credit Agreement, as borrowers, collectively the "Borrowers"), the Lenders (as therein defined), and BOKF, NA dba Bank of Oklahoma, as Administrative Agent for the Lenders. Capitalized terms used herein and not otherwise defined have the respective meanings assigned to them in the Credit Agreement.

As used in this Compliance Certificate (including the Schedules attached hereto), "Quarterly Calculation Date" means the last day of the fiscal quarter ending ___________, 201_.

The undersigned hereby certifies, represents and warrants as follows:

1. The undersigned is the chief financial officer of Unit and as such he or she is authorized to execute and deliver this Compliance Certificate on behalf of the Borrowers and their Subsidiaries (collectively, the "Credit Parties").

2. The undersigned has reviewed the activities of the Credit Parties with a view to determining whether the Credit Parties have fulfilled their respective obligations under the Loan Documents.

3. Except as set forth on Schedule I attached hereto, to the best knowledge of the undersigned, after due inquiry:

(a) each of the Credit Parties has complied with and is in compliance with all of the terms and provisions of each of the Loan Documents to which it is a party;

(b) all representations and warranties made by the Borrowers in the Credit Agreement are true and correct in all material respects as of the date hereof (other than representations and warranties which refer solely to an earlier specified date); and

4. As of the Quarterly Calculation Date, the Borrowers were in compliance with the financial covenants set forth in Sections 8.1 and 8.2 of the Credit Agreement, as demonstrated by the computations set forth in Schedule II attached hereto, calculated in accordance with GAAP to the extent applicable.

5. Schedule III attached hereto contains a complete and accurate list of all Material Subsidiaries of the Borrowers. The Borrowers have complied with Section 9.2 of the Credit Agreement by causing each of the Material Subsidiaries to become a party to the Subsidiary Guaranty.

IN WITNESS WHEREOF, I have executed this Certificate this ______ day of ___________, 201_.

_________________________(name)

Chief Financial Officer

Unit Corporation

SCHEDULE I

TO COMPLIANCE CERTIFICATE

(Disclosure of Defaults and Non-Compliance)

A. Nature of Default or terms of Loan Documents that have not been complied with in all material respects:

B. Steps being taken to correct such Default or noncompliance:

SCHEDULE II

TO COMPLIANCE CERTIFICATE

(Financial Covenant Calculations)

1. Calculation of Current Ratio (Section 8.1)

(To be calculated on a consolidated basis for Unit as of the Quarterly Calculation Date)

Current Assets (including Available Aggregate Commitment)	$_______________________
Divided by : Current Liabilities	÷_______________________
Consolidated Current Ratio:	=_______________________ (must be equal to or greater than 1.0 to 1.0)

2. Consolidated Funded Debt-to-EBITDA Ratio (Section 8.2)

(To be calculated on a consolidated basis for Unit as of the Quarterly Calculation Date)

A. Consolidated Funded Debt	$______________________
B. Consolidated EBITDA	$______________________
C. Consolidated Funded Debt to EBITDA Ratio (Ratio of Item A to Item B)	____________ to 1.00 (must not be greater than 4.00 to 1.00)

SCHEDULE III

TO COMPLIANCE CERTIFICATE

(Material Subsidiaries)

As of the Quarterly Calculation Date, the following constituted all of the Material Subsidiaries of the Borrowers:

EXHIBIT C

FORM OF ASSIGNMENT

This Assignment and Assumption (the "Assignment and Assumption") is dated as of the Effective Date set forth below and is entered into by and between [ Insert name of Assignor ] (the "Assignor") and [ Insert name of Assignee ] (the "Assignee"). Capitalized terms used but not defined herein shall have the meanings given to them in the Senior Credit Agreement dated as of September 13, 2011 (as amended, restated or supplemented from time to time, the "Credit Agreement"), receipt of a copy of which is hereby acknowledged by the Assignee. The Terms and Conditions set forth in Annex 1 attached hereto are hereby agreed to and incorporated herein by reference and made a part of this Assignment and Assumption as if set forth herein in full.

The Assignor hereby sells and assigns to the Assignee, and the Assignee hereby purchases and assumes from the Assignor, an interest in and to the Assignor's rights and obligations under the Credit Agreement and the other Loan Documents, such that after giving effect to such assignment the Assignee shall have purchased pursuant to this Assignment Agreement the percentage interest specified in Item 6(a) below of all outstanding rights and obligations under the Credit Agreement and the other Loan Documents relating to the credit facility listed in Item 5 below (the "Assigned Interest"). The aggregate Commitment (including LC Obligations, if the applicable Commitment has been terminated) purchased by the Assignee hereunder is set forth in Item 6 below.

In consideration for the sale and assignment of Commitments hereunder, the Assignee shall pay the Assignor, on the Effective Date, the amount agreed to by the Assignor and the Assignee. On and after the Effective Date, the Assignee shall be entitled to receive all payments of principal, interest, reimbursement obligations and fees with respect to the interest assigned hereby. The Assignee will promptly remit to the Assignor any interest on Loans and fees received from the Administrative Agent which relate to the portion of the Loans or LC Obligations assigned to the Assignee hereunder and not previously paid by the Assignee to the Assignor. In the event that either party hereto receives any payment to which the other party hereto is entitled under this Assignment Agreement, then the party receiving such amount shall promptly remit it to the other party hereto.

Assignor:

__________________________

Assignee:

__________________________ [and is an Affiliate of ___________________________[ identify Lender ] 1

Borrowers:

Unit Corporation, Superior Pipeline Company, L.L.C., Unit Drilling Company, Unit Petroleum Company, Unit Texas Drilling, L.L.C., Superior Pipeline Texas, L.L.C. and Superior Appalachian Pipeline, L.L.C.

Administrative Agent:

BOKF, NA dba Bank of Oklahoma, as Administrative Agent under the Credit Agreement.

_______________________

1 Select as applicable

Credit Agreement:

The $750,000,000 Senior Credit Agreement dated as of September 13, 2011 among Borrowers, Bank of Oklahoma, National Association, as Administrative Agent, and the Lenders signatory parties thereto.

Assigned Interest:

____________________

a. Assignee's Pro Rata Share of credit facility purchased under the Assignment Agreement	__________%
b. Amount of credit facility purchased under the Assignment Agreement	$___________
c. Assignee's Loans (or LC Obligations with respect to terminated Commitments) purchased hereunder:	$___________

7. Trade Date: _________________________________ 2

8. Payment Instructions to Assignor:

Effective Date: _____________, 201_ [TO BE INSERTED BY ADMINISTRATIVE AGENT AND WHICH SHALL BE THE EFFECTIVE DATE OF RECORDATION OF TRANSFER BY THE ADMINISTRATIVE AGENT.]

__________________________

2 Insert if satisfaction of minimum amounts is to be determined as of the Trade Date.

The terms set forth in this Assignment and Assumption are hereby agreed to:

ASSIGNOR

[name]

BY:________________________________

Title:_______________________________

ASSIGNEE

[name]

BY:________________________________

Title:_______________________________

Consented and Accepted:

BOKF, NA dba Bank of Oklahoma,

as Administrative Agent for the Lenders

By:_____________________________

Name: __________________________

Title: ___________________________

UNIT CORPORATION

By:_______________________________

Name: ____________________________

Title: _____________________________

ANNEX 1

TERMS AND CONDITIONS FOR

ASSIGNMENT AND ASSUMPTION

1. Representations and Warranties .

1.1 Assignor . The Assignor represents and warrants that (i) it is the legal and beneficial owner of the Assigned Interest, (ii) the Assigned Interest is free and clear of any lien, encumbrance or other adverse claim and (iii) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby. Neither the Assignor nor any of its officers, directors, employees, agents or attorneys shall be responsible for (i) any statements, warranties or representations made in or in connection with the Credit Agreement or any other Loan Document, (ii) the execution, legality, validity, enforceability, genuineness, sufficiency, perfection, priority, collectibility, or value of the Loan Documents or any collateral thereunder, (iii) the financial condition of the Borrowers, any of their Subsidiaries or Affiliates or any other Person obligated in respect of any Loan Document, (iv) the performance or observance by the Borrowers, any of their Subsidiaries or Affiliates or any other Person of any of their respective obligations under any Loan Document, (v) inspecting any of the property, books or records of the Borrowers, or Subsidiary Guarantor, or (vi) any mistake, error of judgment, or action taken or omitted to be taken in connection with the Loans or the Loan Documents.

1.2 Assignee . The Assignee (a) represents and warrants that (i) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby and to become a Lender under the Credit Agreement, (ii) from and after the Effective Date, it shall be bound by the provisions of the Credit Agreement as a Lender thereunder and, to the extent of the Assigned Interest, shall have the obligations of a Lender thereunder, (iii) agrees that its payment instructions and notice instructions are as set forth in Item 8 above of this Assignment and Assumption, (iv) confirms that none of the funds, monies, assets or other consideration being used to make the purchase and assumption hereunder are "plan assets" as defined under ERISA and that its rights, benefits and interests in and under the Loan Documents will not be "plan assets" under ERISA, (v) agrees to indemnify and hold the Assignor harmless against all losses, costs and expenses (including, without limitation, reasonable attorneys' fees) and liabilities incurred by the Assignor in connection with or arising in any manner from the Assignee's non- performance of the obligations assumed under this Assignment and Assumption, (vi) it has received a copy of the Credit Agreement, together with copies of financial statements and such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into this Assignment and Assumption and to purchase the Assigned Interest on the basis of which it has made such analysis and decision independently and without reliance on the Administrative Agent or any other Lender, and (vii) attached as Schedule 1 to this Assignment and Assumption is any documentation required to be delivered by the Assignee with respect to its tax status pursuant to the terms of the Credit Agreement, exemption from backup withholding (IRS From W-9 or successor form) on payments pursuant to the Credit Agreement or and other Loan Document described or defined therein or as a Lender that is not a United States person under Section 7701(a)(30) of the Internal Revenue Code for United States federal income tax purposes, duly completed and executed by the Assignee and (b) agrees that (i) it will, independently and without reliance on the Administrative Agent, the Assignor or any other Lender, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Loan Documents, and (ii) it will perform in accordance with their terms all of the obligations which by the terms of the Loan Documents are required to be performed by it as a Lender.

2. Payments . The Assignee shall pay the Assignor, on the Effective Date, the amount agreed to by the Assignor and the Assignee. From and after the Effective Date, the Administrative Agent shall make all payments in respect of the Assigned Interest (including payments of principal, interest, fees and other amounts) to the Assignor for amounts which have accrued to but excluding the Effective Date and to the Assignee for amounts which have accrued from and after the Effective Date.

3. General Provisions . This Assignment and Assumption shall be binding upon, and inure to the benefit of, the parties hereto and their respective successors and assigns. This Assignment and Assumption may be executed in any number of counterparts, which together shall constitute one instrument. Delivery of an executed counterpart of a signature page of this Assignment and Assumption by telecopy shall be effective as delivery of a manually executed counterpart of this Assignment and Assumption. This Assignment and Assumption shall be governed by, and construed in accordance with, the laws of the State of Oklahoma.

SCHEDULE I

(Lender Tax Status Information)

EXHIBIT D

FORM OF AMENDMENT FOR AN INCREASED OR NEW COMMITMENT

This AMENDMENT is made as of the ___ day of __________, 201_, by and among Unit Corporation, a Delaware corporation (as agent for the "Borrowers" signatory parties to the Credit Agreement described and defined below, referred to herein as "Unit"), BOKF, NA dba Bank of Oklahoma, as administrative agent for the Lenders signatory parties to the Credit Agreement (the "Administrative Agent"), and _________________________ (the "Supplemental Lender").

The Borrowers (including Unit), the Administrative Agent and certain other Lenders, as described therein, are parties to a Senior Credit Agreement dated as of September 13, 2011 (as amended, modified, supplemented, or restated, collectively the "Credit Agreement"). All terms used herein and not otherwise defined shall have the same meaning given to them in the Credit Agreement.

Pursuant to Section 14.6 of the Credit Agreement, Unit, on behalf of the Borrowers, has the right to obtain additional Commitments upon satisfaction of certain conditions. This Amendment requires only the signature of Unit, the Administrative Agent and the Supplemental Lender so long as the aggregate amount of the commitments is not increased above the Maximum Credit Amount specified in the Credit Agreement.

The Supplemental Lender is either (a) an existing Lender which is increasing its Commitment or (b) a new Lender which is a lending institution whose identity the Administrative Agent will approve by its signature below.

In consideration of the foregoing, such Supplemental Lender, from and after the date hereof shall have a Commitment of $_______________ and if it is a new Lender, the Supplemental Lender hereby assumes all of the rights and obligations of a Lender under the Credit Agreement.

The Borrowers have executed and delivered to the Supplemental Lender as of the date hereof, if requested by the Supplemental Lender, a new or amended and restated Note in the form attached to the Credit Agreement as Exhibit A to evidence the new or increased Commitment of the Supplemental Lender and the Administrative Agent is distribution a revised Lenders Schedule to the Lenders in the form annexed hereto.

IN WITNESS WHEREOF, the Administrative Agent, the Borrower and the Supplemental Lender have executed this Amendment as of the date shown above.

UNIT CORPORATION

By:_____________________________________

__________________________(name)

__________________________(title)

[SUPPLEMENT LENDER]

By:_____________________________________

Name: __________________________________

Title: _______________________________

BOKF, NA dba Bank of Oklahoma,

Administrative Agent for the Lenders

By:_____________________________________

Name: __________________________________

Title: _______________________________

EXHIBIT E

SUBSIDIARY GUARANTY

THIS GUARANTY AGREEMENT ("Guaranty") is made and entered into effective as of July 26, 2011, by the undersigned guarantor (the "Guarantor"), in favor of (i) the Lenders from time to time parties to the Credit Agreement described below and (ii) BOKF, NA dba Bank of Oklahoma, formerly known as Bank of Oklahoma, National Association, as Administrative Agent under the Credit Agreement (defined below).

RECITALS

A. Unit Corporation, a Delaware corporation, Superior Pipeline Company, L.L.C., an Oklahoma limited liability company, Unit Drilling Company, an Oklahoma corporation, Unit Petroleum Company, Inc., an Oklahoma corporation, Unit Texas Drilling, L.L.C., an Oklahoma limited liability company, Superior Pipeline Texas, L.L.C., an Oklahoma limited liability company, and Superior Appalachian Pipeline, L.L.C., an Oklahoma limited liability company (collectively, the "Borrowers"), the Lenders therein named, and Bank of Oklahoma, National Association, as Administrative Agent for the Lenders, are parties to that certain Senior Credit Agreement dated as of September 13, 2011 (as amended, modified, supplemented, restated and in effect from time to time, the "Credit Agreement").

B. Capitalized terms used herein and not otherwise defined herein have the respective meanings assigned to them in the Credit Agreement.

C. Pursuant to the Credit Agreement, the Lenders have severally agreed to establish in favor of the Borrowers certain Commitments for Advances and LC Obligations in the Aggregate Commitment Amounts, subject to the Maximum Credit Amount.

D. The Guarantor is a Material Subsidiary and will receive substantial and valuable consideration and benefit from the Commitments and the Loans advanced and the LCs issued from time to time by the Lenders and the LC Issuer, respectively, to the Borrowers pursuant to the Credit Agreement.

D. It is a condition precedent to the closing of the Credit Agreement and to each Extension of Credit thereunder that the Guarantor executes and delivers this Guaranty whereby the Guarantor shall absolutely and unconditionally guarantee the prompt and punctual payment when due of all of the Guaranteed Obligations (as hereinafter defined).

NOW, THEREFORE, in consideration of the credit to be extended pursuant to the Credit Agreement, and as a material inducement therefor, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Guarantor hereby covenants and agrees as follows:

SECTION 1. Guaranty . Subject to Section 9 hereof, the Guarantor hereby guarantees to the Lenders and the Administrative Agent, absolutely, unconditionally and irrevocably, and without limitation as to amount, the prompt performance and payment when due (whether at a stated maturity or earlier by reason of acceleration or otherwise) of all Loans, LC Obligations, Reimbursement Obligations and all other Obligations and Outstanding Credit Exposure (as each such term is defined in the Credit Agreement), including, without limitation, principal, interest and fees, and all other liabilities and obligations now or hereafter owing by the Borrowers to the Lenders under the Credit Agreement, the Notes and other relevant Loan Documents, including, without limitation, indemnities, reasonable attorneys' fees, filing and recording costs, out-of-pocket expenses, collection costs and other amounts payable under the Loan Documents, including any such liabilities or obligations incurred or accrued during the pendency of any bankruptcy, insolvency, receivership or other similar proceeding, whether or not allowed or allowable in such proceeding (all of the foregoing liabilities and obligations being hereinafter collectively referred to as the "Guaranteed Obligations"). This Guaranty is a guaranty of payment and not just of collectibility and is in no way conditioned or contingent upon any attempt to collect from the Borrowers or upon any other event, contingency or circumstance whatsoever. If for any reason whatsoever the Borrowers shall fail or be unable duly, punctually and fully to pay such amounts as and when the same shall become due and payable, the Guarantor, without demand, presentment, protest or notice of any kind, will forthwith pay or cause to be paid such amounts to the Administrative Agent under the terms of the Credit Agreement, any Note or other relevant Loan Document, in lawful money of the United States, at the place specified in the Credit Agreement, or perform or comply with the same or cause the same to be performed or complied with, together with interest (to the extent provided for under the Credit Agreement) on any amount due and owing from the Borrowers. The Guarantor, promptly after demand, will pay to the Administrative Agent the reasonable costs and expenses of collecting such amounts or otherwise enforcing this Guaranty, including, without limitation, the reasonable fees and expenses of counsel. Notwithstanding the foregoing, the right of recovery against the Guarantor under this Guaranty is limited to the extent it is judicially determined with respect to any Guarantor that entering into this Guaranty would violate Section 548 of the United States Bankruptcy Code or any comparable provisions of any state law, in which case such Guarantor shall be liable under this Guaranty only for amounts aggregating up to the largest amount that would not render such Guarantor's obligations hereunder subject to avoidance under Section 548 of the United States Bankruptcy Code or any comparable provisions of any state law.

SECTION 2. Guarantor's Obligations Unconditional . The obligations of the Guarantor under this Guaranty shall be primary, absolute and unconditional obligations of the Guarantor, shall not be subject to any counterclaim, set-off, deduction, diminution, abatement, recoupment, suspension, deferment, reduction or defense based upon any claim the Guarantor or any other Person may have against the Borrowers or any other Person, and to the full extent permitted by applicable law shall remain in full force and effect without regard to, and shall not be released, discharged or in any way affected by, any circumstance or condition whatsoever (whether or not the Guarantor or the Borrowers shall have any knowledge or notice thereof), including:

(a) any termination, amendment or modification of or deletion from or addition or supplement to or other change in the Credit Agreement, the Loan Documents or any other instrument or agreement applicable to any of the parties to any of the Loan Documents;

(b) any furnishing or acceptance of any security, or any release of any security, for the Guaranteed Obligations, or the failure of any security or the failure of any Person to perfect any interest in any collateral;

(c) any failure, omission or delay on the part of the Borrowers to conform or comply with any term of any of the Loan Documents or any other instrument or agreement referred to in subsection (a) above, including, without limitation, failure to give notice to the Guarantor of the occurrence of a "Default" or an "Event of Default" under any Loan Document;

(d) any waiver of the payment, performance or observance of any of the obligations, conditions, covenants or agreements contained in any Loan Document, or any other waiver, consent, extension, indulgence, compromise, settlement, release or other action or inaction under or in respect of any of the Loan Documents or any other instrument or agreement referred to in subsection (a) above or any obligation or liability of the Borrowers, or any exercise or non-exercise of any right, remedy, power or privilege under or in respect of any such instrument or agreement or any such obligation or liability;

(e) any failure, omission or delay on the part of any of the Administrative Agent or the Lenders to enforce, assert or exercise any right, power or remedy conferred on the Administrative Agent or the Lenders in this Guaranty, or any such failure, omission or delay on the part of the Administrative Agent or the Lenders in connection with any Loan Document, or any other action on the part of the Administrative Agent or the Lenders;

(f) any voluntary or involuntary bankruptcy, insolvency, reorganization, arrangement, readjustment, assignment for the benefit of creditors, composition, receivership, conservatorship, custodianship, liquidation, marshaling of assets and liabilities or similar proceedings with respect to the Borrowers, any Guarantor or any other Person or any of their respective properties or creditors, or any action taken by any trustee or receiver or by any court in any such proceeding;

(g) any discharge, termination, cancellation, frustration, irregularity, invalidity or unenforceability, in whole or in part, of any of the Loan Documents or any other agreement or instrument referred to in subsection (a) above or any term hereof;

(h) any merger or consolidation of the Borrowers or any Guarantor into or with any other corporation, or any sale, lease or transfer of any of the assets of the Borrowers or any Guarantor to any other Person;

(i) any change in the ownership of any shares of capital stock of the Borrowers or any change in the corporate relationship between the Borrowers and the Guarantor, or any termination of such relationship;

(j) any release or discharge, by operation of law, of the Guarantor from the performance or observance of any obligation, covenant or agreement contained in this Guaranty; or

(k) any other occurrence, circumstance, happening or event whatsoever, whether similar or dissimilar to the foregoing, whether foreseen or unforeseen, and any other circumstance which might otherwise constitute a legal or equitable defense or discharge of the liabilities of a guarantor or surety or which might otherwise limit recourse against the Guarantor.

SECTION 3. Full Recourse Obligations . The obligations of the Guarantor set forth herein constitute the full recourse obligations of the Guarantor enforceable against them to the full extent of all their assets and properties.

SECTION 4. Waiver . The Guarantor unconditionally waives, to the extent permitted by applicable law, (a) notice of any of the matters referred to in Section 2 hereof, (b) notice to the Guarantor of the incurrence of any of the Guaranteed Obligations, notice to the Guarantor or the Borrowers of any breach or default by the Borrowers or the Guarantor with respect to any of the Guaranteed Obligations or any other notice that may be required, by statute, rule of law or otherwise, to preserve any rights of the Administrative Agent or the Lenders against the Guarantor, (c) presentment to or demand of payment from the Borrowers or the Guarantors with respect to any amount due under any Loan Document or protest for nonpayment or dishonor, (d) any right to the enforcement, assertion or exercise by the Administrative Agent or the Lenders of any right, power, privilege or remedy conferred in the Credit Agreement or any other Loan Document or otherwise, (e) any requirement of diligence on the part of any of the Administrative Agent or the Lenders, (f) any requirement to exhaust any remedies or to mitigate the damages resulting from any default under any Loan Document, (g) any notice of any sale, transfer or other disposition by any of the Lenders of any right, title to or interest in the Credit Agreement or in any other Loan Document, and (h) any other circumstance whatsoever which might otherwise constitute a legal or equitable discharge, release or defense of a guarantor or surety or which might otherwise limit recourse against the Guarantor.

SECTION 5. Subrogation, Contribution, Reimbursement or Indemnity . Until one year and one day after all Guaranteed Obligations have been indefeasibly paid in full, the Guarantor agrees not to take any action pursuant to any rights which may have arisen in connection with this Guaranty to be subrogated to any of the rights (whether contractual, under the United States Bankruptcy Code, as amended, including Section 509 thereof, under common law or otherwise) of any of the Lenders against the Borrowers or against any collateral security or guaranty or right of offset held by the Administrative Agent or the Lenders for the payment of the Guaranteed Obligations. Until one year and one day after all Guaranteed Obligations have been indefeasibly paid in full, the Guarantor agrees not to take any action pursuant to any contractual, common law, statutory or other rights of reimbursement, contribution, exoneration or indemnity (or any similar right) from or against the Borrowers which may have arisen in connection with this Guaranty. So long as the Guaranteed Obligations remain, if any amount shall be paid by or on behalf of the Borrowers to any Guarantor on account of any of the rights waived in this Section 5, such amount shall be held by such Guarantor in trust, segregated from other funds of such Guarantor, and shall, forthwith upon receipt by such Guarantor, be turned over to the Administrative Agent (duly endorsed by such Guarantor to the Administrative Agent, if required), to be applied against the Guaranteed Obligations, whether matured or unmatured, in such order as the Administrative Agent may determine. The provisions of this Section 5 shall survive the term of this Guaranty and the payment in full of the Guaranteed Obligations.

SECTION 6. Effect of Bankruptcy or Insolvency Proceedings . This Guaranty shall continue to be effective or be automatically reinstated, as the case may be, if at any time payment, in whole or in part, of any of the sums due to any of the Lenders pursuant to the terms of the Credit Agreement or any other Loan Document is rescinded or must otherwise be restored or returned by such Bank upon the insolvency, bankruptcy, dissolution, liquidation or reorganization of the Borrowers or any other Person, or upon or as a result of the appointment of a custodian, receiver, trustee or other officer with similar powers with respect to the Borrowers or other Person or any substantial part of its property, or otherwise, all as though such payment had not been made. If an event permitting the acceleration of the maturity of the principal amount of the Notes shall at any time have occurred and be continuing, and such acceleration shall at such time be prevented by reason of the pendency against the Borrowers or any other Person of a case or proceeding under a bankruptcy or insolvency law, the Guarantor agrees that, for purposes of this Guaranty and its obligations hereunder, the maturity of the principal amount of the Notes and all other Guaranteed Obligations shall be deemed to have been accelerated with the same effect as if the Lenders had accelerated the same in accordance with the terms of the Credit Agreement or other applicable Loan Document, and the Guarantor shall forthwith pay such principal amount and interest thereon and any other amounts guaranteed hereunder without further notice or demand.

SECTION 7. Termination . This Guaranty shall terminate when, and only when, all of the Guaranteed Obligations have been paid and performed in full, all in accordance with the provisions of the Credit Agreement.

SECTION 8. Representations and Warranties . Guarantor represents and warrants that:

(a) It (i) is duly organized, validly existing in good standing under the laws of the jurisdiction of its incorporation or organization, (ii) has the corporate or other necessary organizational power and authority, and the legal right to own and operate its Properties, to lease the Properties it operates as lessee and to conduct the business in which it is currently engaged, (iii) is duly qualified as a foreign entity and in good standing under the laws of each jurisdiction where its ownership, lease or operation of Property or the conduct of its business requires such qualification, other than in such jurisdictions where the failure to be so qualified and in good standing has not had and could not have a Material Adverse Effect, and (iv) is in compliance with all applicable law, except to the extent that the failure to comply therewith has not had and could not be reasonably expected to have a Material Adverse Effect.

(b) It has the power and authority and legal right to execute and deliver this Guaranty and to perform its obligations hereunder. The execution and delivery by it of this Guaranty and the performance of its obligations hereunder have been duly authorized by proper proceedings. No consent or authorization of, filing with, notice to or other act by or in respect of, any Governmental Authority or other Person is required in connection with its execution and delivery of this Guaranty and performance of its obligations hereunder (other than those which have been obtained).

(c) This Guaranty constitutes a legal, valid and binding obligation of the Guarantor, enforceable against it in accordance with its terms, except as enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the enforcement of creditors' rights generally and by general equitable principles (whether enforcement is sought by proceedings in equity or at law).

(d) The execution, delivery and performance of this Guaranty will not violate any applicable law or any material agreement, instrument or undertaking to which any Guarantor is a party or by which it or any of its Property is bound (collectively, a "Contractual Obligation") of the Guarantor (except those as to which waivers or consents have been obtained and those which could not reasonably be expected to have a Material Adverse Effect), and will not result in, or require, the creation or imposition of any Lien on any of its Properties or revenues pursuant to any applicable law or Contractual Obligation.

(e) It has a substantial economic interest in the Borrowers and expects to derive benefits from transactions resulting in the creation of the Guaranteed Obligations hereby. The Administrative Agent and the Lenders may rely conclusively on a continuing warranty hereby made, that each Guarantor continues to be benefited by the Lenders' extension of credit to the Borrowers, and neither the Administrative Agent nor the Lenders shall have any duty to inquire into or confirm the receipt of any such benefits, and this Guaranty shall be effective and enforceable by the Administrative Agent and the Lenders without regard to the receipt, nature or value of any such benefits.

(f) It has received a copy of the Credit Agreement.

SECTION 9. Limitations on Obligations .

(a) The provisions of this Guaranty are severable, and in any action or proceeding involving any state corporate law, or any state, federal or foreign bankruptcy, insolvency, reorganization or other law affecting the rights of creditors generally, if the obligations of any Guarantor under this Guaranty would otherwise be held or determined to be avoidable, invalid or unenforceable on account of the amount of such Guarantor's liability under this Guaranty, then, notwithstanding any other provision of this Guaranty to the contrary, the amount of such liability shall, without any further action by such Guarantor, the Administrative Agent or the Lenders, be automatically limited and reduced to the highest amount that is valid and enforceable as determined in such action or proceeding (such highest amount determined hereunder being the relevant Guarantor's "Maximum Liability"). This Section 9(a) with respect to the Maximum Liability of any Guarantor is intended solely to preserve the rights of the Administrative Agent and the Lenders to the maximum extent not subject to avoidance under applicable law, and neither any Guarantor nor any other Person or entity shall have any right or claim under this Section 9(a) with respect to the Maximum Liability, except to the extent necessary so that the obligations of any Guarantor hereunder shall not be rendered voidable under applicable law.

(b) The Guarantor agrees that the Guaranteed Obligations may at any time and from time to time exceed the Maximum Liability of Guarantor, and may exceed the aggregate Maximum Liability of any other guarantors, without impairing this Guaranty or affecting the rights and remedies of the Administrative Agent or the Lenders. Nothing in this Section 9(b) shall be construed to increase any Guarantor's obligations hereunder beyond its Maximum Liability.

(c) In the event any Guarantor (a "Paying Guarantor") shall make any payment or payments under this Guaranty or shall suffer any loss as a result of any realization upon any collateral granted by it to secure its obligations under this Guaranty, any other guarantor (each a "Non-Paying Guarantor") shall contribute to such Paying Guarantor an amount equal to such Non-Paying Guarantor's "Pro Rata Share" of such payment or payments made, or losses suffered, by such Paying Guarantor. For the purposes hereof, each Non-Paying Guarantor's "Pro Rata Share" with respect to any such payment or loss by a Paying Guarantor shall be determined as of the date on which such payment or loss was made by reference to the ratio of (i) such Non-Paying Guarantor's Maximum Liability as of such date (without giving effect to any right to receive, or obligation to make, any contribution hereunder) or, if such Non-Paying Guarantor's Maximum Liability has not been determined, the aggregate amount of all monies received by such Non-Paying Guarantor from the Borrowers after the date hereof (whether by loan, capital infusion or by other means) to (ii) the aggregate Maximum Liability of all guarantors hereunder (including such Paying Guarantor) as of such date (without giving effect to any right to receive, or obligation to make, any contribution hereunder), or to the extent that a Maximum Liability has not been determined for any guarantors, the aggregate amount of all monies received by such guarantors from the Borrowers after the date hereof (whether by loan, capital infusion or by other means). Nothing in this Section 9(c) shall affect any Guarantor's or any other guarantor's several liability for the entire amount of the Guaranteed Obligations (up to such guarantor's Maximum Liability). Each Guarantor covenants and agrees that its right to receive any contribution under this Guaranty from a Non-Paying Guarantor shall be subordinate and junior in right of payment to all the Guaranteed Obligations. The provisions of this Section 9(c) are for the benefit of the Administrative Agent, the Lenders and the Guarantor and may be enforced by any one, or more, or all of them in accordance with the terms hereof.

SECTION 10. Notices . Any notice, demand, request or consent required or authorized hereunder shall be served in person or delivered by U.S. certified mail, return receipt requested, addressed as follows:

If to Guarantor:	c/o Unit Corporation 1000 Kensington Tower I Tulsa, Oklahoma 74136 Fax: (918) 493-7711 Attention: General Counsel
If to the Lenders or the Administrative Agent:	BOKF, NA, dba Bank of Oklahoma Bank of Oklahoma Tower One Williams Center Tulsa, Oklahoma 74192 Attn: Energy Department – 8th Floor Fax: (918) 588-6880

or at such other address as the Guarantor or the Administrative Agent shall designate for such purpose in a written notice to the other parties. Notices served in person shall be effective and deemed given when delivered; and notices sent by certified mail shall be effective and deemed given three (3) Business Days after being deposited in the U.S. mail, postage prepaid.

SECTION 11. Survival . All warranties, representations and covenants made by the Guarantor herein or in any certificate or other instrument delivered by it or on its behalf hereunder shall be considered to have been relied upon by the Lenders and shall survive the execution and delivery of this Guaranty, regardless of any investigation made by the Administrative Agent or any of the Lenders. All statements in any such certificate or other instrument shall constitute warranties and representations by the Guarantors hereunder.

SECTION 12. Severability . Any remedy or right hereby granted which shall be found to be unenforceable as to any Person or under any circumstance, for any reason, shall in no way limit or prevent the enforcement of such remedy or right as to any other Person or circumstances, nor shall such unenforceability limit or prevent enforcement of any other remedy or right hereby granted.

SECTION 13. Collection Costs . The Guarantor agrees to reimburse the Administrative Agent upon demand for all reasonable out of pocket expenses (including reasonable attorneys' fees and legal expenses) incurred by the Administrative Agent or the Lenders arising out of or in connection with the enforcement of the Guaranteed Obligations or arising out of or in connection with any failure of the Guarantor to fully and timely perform their obligations hereunder.

SECTION 14. Governing Law . This Guaranty is made under and shall be governed by the laws of the State of Oklahoma, without giving effect to conflict of laws principles thereof.

SECTION 15. Jurisdiction and Venue . All actions or proceedings with respect to this Guaranty may be instituted in any state or federal court sitting in Tulsa County, Oklahoma, and by execution and delivery of this Guaranty, the Guarantor irrevocably and unconditionally (i) submits to the nonexclusive jurisdiction (both subject matter and Person) of each such court, and (ii) waives (a) any objection that the Guarantors may now or hereafter have to the laying of venue in any of such courts, and (b) any claim that any action or proceeding brought in any such court has been brought in an inconvenient forum.

SECTION 16. Waiver of Jury Trial . The Guarantor, the Administrative Agent and the Lenders (by their acceptance hereof) hereby voluntarily, knowingly, irrevocably and unconditionally waive any right to have a jury participate in resolving any dispute (whether based upon contract, tort or otherwise) between or among the Borrowers or the Guarantor and the Administrative Agent or the Lenders arising out of or in any way related to this Guaranty. This Section 16 is a material inducement to the Lenders to provide the financing described herein or in the Credit Agreement.

SECTION 17. Additional Guarantors . Pursuant to Section 9.2 of the Credit Agreement, all future Material Subsidiaries of the Borrowers shall execute and deliver to the Administrative Agent a Guaranty Joinder Agreement, the form of which is attached hereto as Schedule I and made a part hereof. Upon the execution of a Guaranty Joinder Agreement, the Material Subsidiary shall be deemed to be a Guarantor for all purposes under this Guaranty and shall subscribe to and agree to be bound by all of the terms, conditions, agreements, covenants, and undertakings set forth in herein.

SECTION 18. Section Headings . The Section and subsection headings herein are for convenience only and shall not be deemed part of this Guaranty.

SECTION 19. Successors and Assigns . This Guaranty shall be binding upon the Guarantor and the Guarantor's successors and assigns and shall inure to the benefit of the Administrative Agent and the Lenders and their successors and assigns.

SECTION 20. Time of the Essence . The Guarantor acknowledges that time is of the essence with respect to the Guarantors' obligations under this Guaranty.

IN WITNESS WHEREOF, the Guarantor has caused this Guaranty to be duly executed as of the day and year first above written.

[______________________]

By:_____________________________________

Name: __________________________________

Title: ___________________________________

SCHEDULE I

GUARANTY JOINDER AGREEMENT

THIS GUARANTY JOINDER AGREEMENT (this "Joinder"), dated as of _________, 201_, is executed by _____________________________, a ____________ ___________ (the "Additional Guarantor"), in favor of (i) the Lenders from time to time parties to the Credit Agreement described below and (ii) BOKF, NA dba Bank of Oklahoma, as Administrative Agent under the Credit Agreement.

RECITALS

A. Unit Corporation, a Delaware corporation, Superior Pipeline Company, L.L.C., an Oklahoma limited liability company, Unit Drilling Company, an Oklahoma corporation, Unit Petroleum Company, Inc., an Oklahoma corporation, Unit Texas Drilling, L.L.C., an Oklahoma limited liability company, Superior Pipeline Texas, L.L.C., an Oklahoma limited liability company, and Superior Appalachian Pipeline, L.L.C., an Oklahoma limited liability company (collectively, the "Borrowers"), the Lenders therein named, and BOKF, NA, dba Bank of Oklahoma, as Administrative Agent, are parties to that certain Senior Credit Agreement dated effective as of September 13, 2011 (as amended, restated, supplemented or otherwise modified from time to time, the "Credit Agreement"). Capitalized terms used herein and not otherwise defined herein have the respective meanings assigned to them in the Credit Agreement.

B. A Material Subsidiary has entered into that certain Guaranty Agreement dated effective as of _________, __ 201__, in favor of the Lender and the Administrative Agent (as amended, restated, supplemented or otherwise modified from time to time, the "Guaranty"), pursuant to which such Material Subsidiary absolutely and unconditionally guaranteed, the full and punctual payment and performance of the Guaranteed Obligations, as more particularly set forth in the Guaranty.

C. The Additional Guarantor is a Material Subsidiary of the Borrowers, and pursuant to Section 9.2 of the Credit Agreement, the Borrowers are required to cause the Additional Guarantor to guarantee to the Administrative Agent the prompt payment and performance of the Guaranteed Obligations. The Additional Guarantor desires to execute and deliver this Joinder to satisfy such requirement.

NOW, THEREFORE, in consideration of the premises and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Additional Guarantor agrees as follows:

SECTION 1. Guaranty . The Additional Guarantor hereby absolutely and unconditionally guarantees, jointly and severally, as a primary obligor and not as surety, the full and punctual payment (whether at stated maturity, upon acceleration or early termination or otherwise, and at all times thereafter) and performance of the Guaranteed Obligations (as such term is defined in the Guaranty), including, without limitation, any such Guaranteed Obligations incurred or accrued during the pendency of any bankruptcy, insolvency, receivership or other similar proceeding, whether or not allowed or allowable in such proceeding. This Guaranty is a guaranty of payment and not just of collectibility and is in no way conditioned or contingent upon any attempt to collect from the Borrowers or upon any other event, contingency or circumstance whatsoever. If for any reason whatsoever the Borrowers shall fail or be unable duly, punctually and fully to pay such amounts as and when the same shall become due and payable, the Guarantors, without demand, presentment, protest or notice of any kind, will forthwith pay or cause to be paid such amounts to the Administrative Agent under the terms of the Credit Agreement, any Note or other relevant Loan Document, in lawful money of the United States, at the place specified in the Credit Agreement, or perform or comply with the same or cause the same to be performed or complied with, together with interest (to the extent provided for under the Credit Agreement) on any amount due and owing from the Borrowers.

SECTION 2. Binding Effect . This Joinder shall become effective when it shall have been executed by the Additional Guarantor and thereafter shall be binding upon the Additional Guarantor and shall inure to the benefit of the Lenders. Upon the effectiveness of this Joinder, the Additional Guarantor shall be deemed to be a Guarantor for all purposes under the Guaranty and shall subscribe to and agree to be bound by all of the terms, conditions, agreements, covenants, and undertakings set forth in the Guaranty, and this Joinder shall be deemed to be a part of and shall be subject to all the terms and conditions of the Guaranty. The Additional Guarantor shall not have the right to assign its rights hereunder or any interest herein without the prior written consent of the Administrative Agent.

SECTION 3. CHOICE OF LAW . THIS JOINDER SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE INTERNAL LAWS (AND NOT THE LAW OF CONFLICTS) OF THE STATE OF OKLAHOMA.

IN WITNESS WHEREOF, the Additional Guarantor has caused this Joinder to be duly executed and delivered by its duly authorized officer as of the date first above written.

[______________________]

By:_____________________________________

Name: __________________________________

Title: ___________________________________

SCHEDULE 1

PRICING SCHEDULE

Applicable Margin	Level I Status	Level II Status	Level III Status	Level IV Status
Eurodollar Rate	1.75%	2.00%	2.25%	2.50%
Floating Rate	0.75%	1.00%	1.25%	1.50%

Applicable Margin	Level I Status	Level II Status	Level III Status	Level IV Status
Commitment Fee Rate	0.375%	0.50%	0.50%	0.50%

For the purposes of this Schedule, the following terms have the following meanings, subject to the final paragraph of this Schedule:

“Level I Status” exists at any date if the Borrowing Base Usage Percentage on such date is less than 50%.

“Level II Status” exists at any date if the Borrowing Base Usage Percentage on such date is greater than or equal to 50% and less than 75%.

“Level III Status” exists at any date if the Borrowing Base Usage Percentage on such date is greater than or equal to 75% and less than 90%.

“Level IV Status” exists at any date if the Borrowing Base Usage Percentage on such date is greater than or equal to 90%.

“Status” means either Level I Status, Level II Status, Level III Status or Level IV Status.

The Applicable Margin and Commitment Fee Rate will be determined on a daily basis in accordance with the foregoing table based on the Borrowing Base Usage Percentage on such day (notwithstanding the fact that Unit may have designated a lower Commitment amount).

SCHEDULE 2

LENDERS SCHEDULE

Lender	Total Commitment Amount	Pro Rata Share
BOK (BOKF, NA, dba Bank of Oklahoma)	$50,000,000	20.00%
BBVA Compass	$50,000,000	20.00%
BMO	$42,000,000	16.80%
Bank of America, N.A.	$42,000,000	16.80%
Comerica Bank	$22,000,000	8.80%
Credit Agricole	$22,000,000	8.80%
BNP Paribas	$22,000,000	8.80%
TOTAL	$250,000,000.00	100.00%

Schedules 3-7 to this agreement have been omitted from this filing.