Document:

<PAGE>   1
                                                                  EXHIBIT 10.1.2

                     SECOND AMENDMENT TO US CREDIT AGREEMENT

         THIS SECOND AMENDMENT TO US CREDIT AGREEMENT (herein called this
"Amendment") made as of June 27, 2001 by and among Devon Energy Corporation, a
Delaware corporation ("US Borrower"), Bank of America, N.A., individually and as
administrative agent ("US Agent"), and the US Lenders party to the Original
Agreement defined below ("US Lenders").

                                   WITNESSETH:

         WHEREAS, US Borrower, US Agent and US Lenders entered into that certain
US Credit Agreement dated as of August 29, 2000 (as amended, supplemented, or
restated to the date hereof, the "Original Agreement"), for the purpose and
consideration therein expressed, whereby US Lenders became obligated to make
loans to US Borrower as therein provided;

         WHEREAS, US Borrower, US Agent and US Lenders desire to amend the
Original Agreement as set forth herein;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original Agreement, in
consideration of the loans which may hereafter be made by US Lenders to US
Borrower, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto do hereby agree
as follows:

                                   ARTICLE I.

                           Definitions and References

         Section 1.1. Terms Defined in the Original Agreement. Unless the
context otherwise requires or unless otherwise expressly defined herein, the
terms defined in the Original Agreement shall have the same meanings whenever
used in this Amendment.

         Section 1.2. Other Defined Terms. Unless the context otherwise
requires, the following terms when used in this Amendment shall have the
meanings assigned to them in this Section 1.2.

                  "Amendment" means this Second Amendment to US Credit
         Agreement.

                  "US Agreement" means the Original Agreement as amended hereby.

<PAGE>   2

                                   ARTICLE II.

                        Amendments to Original Agreement

         Section 2.1. Defined Terms. The following additional defined terms are
hereby added to Annex I of the Original Agreement in appropriate alphabetical
order to read as follows:

                  "Devon Stock Repurchases" the purchase, redemption, or other
         acquisition for value by US Borrower of shares of its Common Stock, par
         value $0.10.

                  "Repurchased Devon Stock" means the shares of US Borrower's
         Common Stock, par value $0.10, repurchased by US Borrower pursuant to
         Devon Stock Repurchases.

         Section 2.2. Use of Proceeds. The next to last sentence of Section 1.4
of the Original Agreement is hereby deleted and the following new sentence is
hereby substituted therefor:

         "In no event shall the funds from any US Loan or any Letter of Credit
         be used directly or indirectly by any Person for personal, family,
         household or agricultural purposes or for the purpose, whether
         immediate, incidental or ultimate, of purchasing, acquiring or carrying
         any "margin stock" (as such term is defined in Regulation U promulgated
         by the Board of Governors of the Federal Reserve System) or to extend
         credit to others directly or indirectly for the purpose of purchasing
         or carrying any such margin stock; provided that US Borrower may make
         Devon Stock Repurchases in compliance with such Regulation U and the
         other provisions of this Agreement."

         Section 2.3. Limitation on Restricted Payments. Section 7.5 of the
Original Agreement is hereby amended in its entirety to read as follows:

                  "Section 7.5. Limitation on Restricted Payments. The aggregate
         amount of Restricted Payments made by the Restricted Persons during any
         Fiscal Year shall not exceed twenty percent (20%) of the book value of
         the Consolidated Assets of US Borrower as of the end of the immediately
         preceding Fiscal Year, as adjusted to take into account any increase
         associated with an acquisition or merger."

         Section 2.4. Disclosure Schedule. Paragraph 6 of the Disclosure
Schedule to the Original Agreement is hereby deleted and replaced by the list
set forth in Schedule 1 hereto, on which the following two new Subsidiaries have
been added: Tall Grass Gas Services, L.L.C. and Devon Energy Charitable
Foundation.

<PAGE>   3

                                  ARTICLE III.

                           Conditions of Effectiveness

         Section 3.1. Effective Date. This Amendment shall become effective as
of the date first above written when and only when:

         (a) US Agent shall have received all of the following, at US Agent's
office, duly executed and delivered and in form and substance satisfactory to US
Agent, all of the following:

                  (i) this Amendment executed by US Borrower, US Agent and US
         Required Lenders;

                  (ii) a certificate of the Senior Vice President - Finance or
         the Treasurer of US Borrower dated the date of this Amendment
         certifying: (i) that all of the representations and warranties set
         forth in Article IV hereof are true and correct at and as of such date,
         and (ii) that no Default exists at and as of such date.

         (b) US Borrower shall have paid, in connection with such US Loan
Documents, all fees and reimbursements to be paid to US Agent pursuant to any US
Loan Documents, or otherwise due US Agent and including fees and disbursements
of US Agent's attorneys.

                                   ARTICLE IV.

                         Representations and Warranties

         Section 4.1. Representations and Warranties of US Borrower. In order to
induce each US Lender to enter into this Amendment, US Borrower represents and
warrants to each US Lender that:

         (a) The representations and warranties contained in Article V of the
Original Agreement are true and correct at and as of the time of the
effectiveness hereof, except to the extent that the facts on which such
representations and warranties are based have been changed by the extension of
credit under the US Agreement.

         (b) US Borrower is duly authorized to execute and deliver this
Amendment and is and will continue to be duly authorized to borrow monies and to
perform its obligations under the US Agreement. US Borrower has duly taken all
corporate action necessary to authorize the execution and delivery of this
Amendment and to authorize the performance of the obligations of US Borrower
hereunder.

         (c) The execution and delivery by US Borrower of this Amendment, the
performance by US Borrower of its obligations hereunder and the consummation of
the transactions

<PAGE>   4

contemplated hereby do not and will not (i) conflict with any provision of (A)
any Law, (B) the organizational documents of US Borrower, or (C) any agreement,
judgment, license, order or permit applicable to or binding upon US Borrower
unless such conflict would not reasonably be expected to have a Material Adverse
Effect, or (ii) result in or require the creation of any Lien upon any assets or
properties of US Borrower which would reasonably be expected to have a Material
Adverse Effect, except as expressly contemplated or permitted in the Loan
Documents. Except as expressly contemplated in the Loan Documents no consent,
approval, authorization or order of, and no notice to or filing with, any
Tribunal or third party is required in connection with the execution, delivery
or performance by US Borrower of this Amendment or to consummate any
transactions contemplated by this Amendment, unless failure to obtain such
consent would not reasonably be expected to have a Material Adverse Effect.

         (d) When duly executed and delivered, each of this Amendment and the US
Agreement will be a legal and binding obligation of US Borrower, enforceable in
accordance with its terms, except as limited by bankruptcy, insolvency or
similar laws of general application relating to the enforcement of creditors'
rights and by equitable principles of general application.

         (e) The audited annual Consolidated financial statements of US Borrower
dated as of December 31, 2000 and the unaudited quarterly Consolidated financial
statements of US Borrower dated as of March 31, 2001 fairly present the
Consolidated financial position at such dates and the Consolidated statement of
operations and the changes in Consolidated financial position for the periods
ending on such dates for US Borrower. Copies of such financial statements have
heretofore been delivered to each US Lender. Since such dates no material
adverse change has occurred in the financial condition or businesses or in the
Consolidated financial condition or businesses of US Borrower.

                                   ARTICLE V.

                                  Miscellaneous

         Section 5.1. Ratification of Agreements. The Original Agreement as
hereby amended is hereby ratified and confirmed in all respects. The US Loan
Documents, as they may be amended or affected by this Amendment, are hereby
ratified and confirmed in all respects. Any reference to the US Agreement in any
Loan Document shall be deemed to be a reference to the Original Agreement as
hereby amended. The execution, delivery and effectiveness of this Amendment
shall not, except as expressly provided herein, operate as a waiver of any
right, power or remedy of US Lenders under the US Agreement or any other US Loan
Document nor constitute a waiver of any provision of the US Agreement or any
other US Loan Document.

         Section 5.2. Survival of Agreements. All representations, warranties,
covenants and agreements of US Borrower herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full. All statements and agreements

<PAGE>   5

contained in any certificate or instrument delivered by US Borrower or any
Restricted Person hereunder or under the US Agreement to any US Lender shall be
deemed to constitute representations and warranties by, and/or agreements and
covenants of, US Borrower under this Amendment and under the US Agreement.

         Section 5.3. US Loan Documents. This Amendment is a US Loan Document,
and all provisions in the US Agreement pertaining to US Loan Documents apply
hereto.

         Section 5.4. Governing Law. This Amendment shall be governed by and
construed in accordance the laws of the State of Texas and any applicable laws
of the United States of America in all respects, including construction,
validity and performance.

         Section 5.5. Counterparts; Fax. This Amendment may be separately
executed in counterparts and by the different parties hereto in separate
counterparts, each of which when so executed shall be deemed to constitute one
and the same Amendment. This Amendment may be validly executed by facsimile or
other electronic transmission.

         THIS AMENDMENT AND THE OTHER US 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 OF THE PARTIES.

        [THE REMAINDER OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

<PAGE>   6

         IN WITNESS WHEREOF, this Amendment is executed as of the date first
above written.

                                     DEVON ENERGY CORPORATION
                                     US Borrower

                                     By: /s/ William T. Vaughn
                                         --------------------------------------
                                              William T. Vaughn
                                              Senior Vice President - Finance

                                     ABN AMRO BANK, N.V.
                                     Lender

                                     By: /s/
                                         --------------------------------------
                                     Name:
                                     Title:

                                     By: /s/
                                         --------------------------------------
                                     Name:
                                     Title:

                                     BANK OF AMERICA, N.A.,
                                     Administrative Agent, US LC Issuer
                                     and Lender

                                     By: /s/ J. Scott Fowler
                                         --------------------------------------
                                     Name:    J. Scott Fowler
                                     Title:   Managing Director

                                     BANK OF MONTREAL
                                     Lender

                                     By: /s/ James B. Whitmore
                                         --------------------------------------
                                     Name:    James B. Whitmore
                                     Title:   Managing Director

                                     BANK OF TOKYO - MITSUBISHI LTD.
                                     HOUSTON AGENCY
                                     Lender

                                     By: /s/
                                         --------------------------------------
                                     Name:
                                     Title:

<PAGE>   7

                                     BANK ONE, NA
                                     Lender

                                     By: /s/ Ronald L. Dierker
                                         --------------------------------------
                                     Name:    Ronald L. Dierker
                                     Title:   Director, Capital Markets

                                     BAYERISCHE LANDESBANK
                                     GIROZENTRALE, CAYMAN ISLANDS
                                     BRANCH
                                     Lender

                                     By: /s/ Hereward Drummond
                                         --------------------------------------
                                     Name:    Hereward Drummond
                                     Title:   Senior Vice President

                                     By: /s/ James H. Boyle
                                         --------------------------------------
                                     Name:    James H. Boyle
                                     Title:   Vice President

                                     CIBC, INC.
                                     Lender

                                     By: /s/ Nora Q. Catiis
                                         --------------------------------------
                                     Name:    Nora Q. Catiis
                                     Title:   Authorized Signatory

                                     CITIBANK, N.A.
                                     Lender

                                     By: /s/ Todd J. Mogil
                                         --------------------------------------
                                     Name:    Todd J. Mogil
                                     Title:   Attorney-In-Fact

                                     CREDIT LYONNAIS NEW YORK BRANCH
                                     Lender

                                     By: /s/ Philippe Soustra
                                         --------------------------------------
                                     Name:    Philippe Soustra
                                     Title:   Executive Vice President

<PAGE>   8

                                     DEUTSCHE BANK AG NEW YORK
                                     AND/OR CAYMAN ISLANDS
                                     BRANCH
                                     Lender

                                     By: /s/ Hans C. Narberhaus
                                         --------------------------------------
                                     Name:    Hans C. Narberhaus
                                     Title:   Vice President

                                     By: /s/ David G. Dickinson, Jr.
                                         --------------------------------------
                                     Name:    David G. Dickinson, Jr.
                                     Title:   Vice President

                                     FIRST UNION NATIONAL BANK
                                     Lender

                                     By: /s/ Robert R. Wetteroff
                                         --------------------------------------
                                     Name:    Robert R. Wetteroff
                                     Title:   Senior Vice President

                                     MORGAN GUARANTY TRUST
                                     COMPANY OF NEW YORK
                                     Lender

                                     By: /s/ Russell A. Johnson
                                         --------------------------------------
                                     Name:    Russell A. Johnson
                                     Title:   Vice President

                                     ROYAL BANK OF CANADA
                                     Lender

                                     By: /s/ Lorne A. Gartner
                                         --------------------------------------
                                     Name:    Lorne A. Gartner
                                     Title:   Vice President

                                     SUNTRUST BANK, ATLANTA
                                     Lender

                                     By: /s/ David J. Edge
                                         --------------------------------------
                                     Name:    David J. Edge
                                     Title:   Director

<PAGE>   9

                                     THE BANK OF NEW YORK
                                     Lender

                                     By: /s/ Raymond J. Palmer
                                         --------------------------------------
                                     Name:    Raymond J. Palmer
                                     Title:   Vice President

                                     THE CHASE MANHATTAN BANK
                                     Lender

                                     By: /s/ Russell A. Johnson
                                         --------------------------------------
                                     Name:    Russell A. Johnson
                                     Title:   Vice President

                                     THE FUJI BANK, LIMITED
                                     Lender

                                     By: /s/ Jacques Azagury
                                         --------------------------------------
                                     Name:    Jacques Azagury
                                     Title:   Senior Vice President & Manager

                                     TORONTO-DOMINION (TEXAS), INC.
                                     Lender

                                     By: /s/ Debbie A. Greene
                                         --------------------------------------
                                     Name:    Debbie A. Greene
                                     Title:   Vice President

                                     UMB BANK
                                     Lender

                                     By: /s/ Richard J. Lehrter
                                         --------------------------------------
                                     Name:    Richard J. Lehrter
                                     Title:   Community Bank President

                                     WESTDEUTSCHE LANDESBANK
                                     GIROZENTRALE
                                     Lender

                                     By: /s/
                                         --------------------------------------
                                     Name:
                                     Title:

                                     By: /s/
                                         --------------------------------------
                                     Name:
                                     Title:

<PAGE>   10

                                                                      SCHEDULE 1

                        AMENDMENT TO DISCLOSURE SCHEDULE

         6. Section 5.11 US Borrower's Subsidiaries: The following entities are,
directly or indirectly, wholly owned by US Borrower (unless otherwise noted):

                  Devon Energy Corporation (Oklahoma), an Oklahoma corporation

                  Devon Energy Management Company, L.L.C.

                  Devon Financing Trust II

                  DBC, Inc., an Oklahoma corporation

                  Devon Holding Corporation, f/k/a/ Devon Acquisition
                  Corporation, a Delaware corporation

                  Devon Production Corporation, a Nevada corporation

                  Catclaw Pipeline, Inc., an Oklahoma corporation

                  Northstar Energy Corporation (100% of common shares)

                  Devon Energy Canada, Ltd.

                  Devon Energy Insurance Company Limited

                  Richland Development Corporation

                  Canoa Ranch Corporation

                  Richland Transition Company

                  Strategic Trust Company

                  Vermejo Park Corporation

                  Vermejo Minerals Corporation

                  Devon Financing Trust (100% of common securities)

                  Thunder Creek Gas Services, L.L.C. (75%)

<PAGE>   11

                  Sage Creek Processors, L.L.C.

                  American Sulphur Export Corporation (50%) which owns 100% of
                  Amsulex, Inc.

                  Foothills Partnership (1%)

                  Morrison Nuclear Inc.

                  Devon Energy Partners A Limited Partnership

                  Mountain Energy Inc.

                  Northstar Energy Partnership

                  Devon Energy Production Company, L.P.

                  Bonito Pipe Line Company

                  Cachuma Gas Processing Company

                  Canyon Reef Carriers, Inc.

                  Capitan Oil Pipeline Company

                  Pennzoil Energy Marketing Company

                  Pennzoil Gas Marketing Company

                  Devon Energy International Company

                  Pennzoil Asiatic Inc.

                  Devon Energy Egypt, Inc.

                  Pennzoil Qatar Inc.

                  Azerbaijan International Operating Corporation (5%)

                  Caspian International Petroleum Company (30%)

                  Devon Energy Beni Suef Inc.

                  Devon Energy Caspian Corporation

<PAGE>   12

                  Pennzoil Caspian Development Corporation

                  Devon Energy Exploration Brazil, Inc.

                  Devon Energy Brasil, Ltda.

                  Devon Energy Qatar Production, Inc.

                  Devon Energy Red Sea, Inc.

                  Fanar Petroleum Company (50%)

                  Devon Energy Sinai, Inc.

                  Devon Energy Suez, Inc.

                  Pennzoil Venezuela Corporation SA

                  Nueces Intrastate Pipe Line Company

                  Devon Energy Intrastate Pipeline Company

                  Devon Energy Offshore Pipeline Company

                  Devon Energy Petroleum Pipeline Company

                  Pennzoil Petroleums Ltd.

                  Pennzoil Resources Canada Ltd.

                  PennzEnergy (U.K.) Company

                  Pepco Partners, L.P. (20%)

                  Sisquoc Gas Pipeline Company

                  Tiburon Transport Company

                  892306 Alberta Ltd..

                  Canadian Gas Gathering Systems II, Inc.

                  167496 Canada Ltd. (64%)

<PAGE>   13

                  Devon-Blanco Company

                  Morrison Gas Gathering Inc.

                  Morrison Operating Company Ltd.

                  Morrison Petroleums, Ltd.

                  Northstar Energy Inc.

                  Richland Properties Company, L.L.C.

                  BN Coal, L.L.C.

                  BN Non-Coal, L.L.C.

                  B&N Co. A Limited Partnership

                  Blackwood & Nichols Co. A Limited Partnership

                  Devon SFS Operating, Inc. (formerly Devon Merger Co./Santa Fe
                  Snyder Corporation)

                  Santa Fe Platform Management, Inc.

                  Security Purchasing, Inc.

                  Snyder Fluid Technology, Inc.

                  Snyder Gas Marketing, Inc.

                  SOCO Technologies, Inc.

                  SOCO Gas Systems, Inc.

                  SOCO Louisiana Leasing, Inc.

                  Adobe Offshore Pipeline Company

                  Santa Fe Pacific Fuels Company

                  Mexican Flats Service Company, Inc.

                  Wyoming Gathering and Production Company, Inc.

<PAGE>   14

                  SOCO International, Inc.

                  SOCO International Holdings, Inc.

                  Santa Fe Energy Resources (Delaware), Ltd.

                  SFERI, Inc.
                  Santa Fe Energy Resources of Ghana, Ltd.

                  Santa Fe Energy Resources International, Ltd.

                  Santa Fe Energy Resources (New Ventures II), Ltd.

                  Santa Fe Energy Resources (New Ventures III), Ltd.

                  Santa Fe Energy Resources (New Ventures IV), Ltd.

                  Santa Fe Energy Resources (Cote D'Ivoire) Ltd.

                  Santa Fe Energy Resources Port Bouet Ltd.

                  Santa Fe Energy Resources (Bermuda) Limited.

                  Santa Fe Energy Resources Kepala Burung Limited

                  Santa Fe Energy Resources Bangko Ltd.

                  Santa Fe Energy Resources Pagatan Ltd.

                  Santa Fe Energy Resources of China, Ltd.

                  Santa Fe Energy Resources of Malaysia, Ltd.

                  Santa Fe Energy Resources (Thai Holding), Ltd.

                  Santa Fe Energy Resources (Thailand), Ltd.

                  Santa Fe Energy Resources Congo, Ltd.

                  Santa Fe Energy Resources Gabon (Agali), Ltd.

                  Santa Fe Energy Resources (Brazil Holdings I), Ltd.

<PAGE>   15

                  Santa Fe Energy Resources (Brazil Holdings II), Ltd.

                  SFR Petroleo Do Brazil Ltda.

                  SFS (International), Ltd.

                  SFS (Holdings), Ltd.

                  Santa Fe Energy Resources (Jabung), Ltd.

                  Santa Fe Energy Resources Limited

                  Santa Fe Energy Resources of Gabon, Ltd.

                  Petrolera Santa Fe S.A.

                  Braemar Shipping Company Limited

                  Santa Fe Energy Resources South East Asia Limited

                  746481 Alberta Ltd.

                  Trend Exploration (PNG) Party Ltd.

                  Santa Fe Energy Resources of Gabon (Mondah Bay), Ltd.

                  Santa Fe Energy Resources of Canada, Inc.

                  Santa Fe Energy Resources of Myanmar, Ltd.

                  Petrolera Santa Fe (Columbia), Ltd.

                  Santa Fe Energy Resources of Peru, Ltd.

                  Santa Fe Energy Resources of Bolivia, Inc.

                  Santa Fe Energy Company of Argentina

                  Trend Argentina S.A.

                  Santa Fe Energy Resources of Morocco, Ltd.

                  Gulf Coast American Corp.

<PAGE>   16

                  SFS Malta One, Inc.

                  SFS Malta Two, Inc.

                  SFS (France) SARL

                  Ceara Star (Malta) Ltd.

                  SFS Malta Holding Company Ltd.

                  SFS Malta International Trading Company Ltd.

                  Tall Grass Gas Services, L.L.C.

                  Devon Energy Charitable Foundation<PAGE>   1
                                                                  EXHIBIT 10.2.2

                  SECOND AMENDMENT TO CANADIAN CREDIT AGREEMENT

         THIS SECOND AMENDMENT TO CANADIAN CREDIT AGREEMENT (herein called this
"Amendment") made as of June 27, 2001 by and among Northstar Energy Corporation,
an Alberta corporation ("Canadian Borrower"), Bank of America Canada,
individually and as administrative agent ("Canadian Agent"), and the Canadian
Lenders party to the Original Agreement defined below ("Canadian Lenders").

                                   WITNESSETH:

         WHEREAS, Canadian Borrowers, Canadian Agent and Canadian Lenders
entered into that certain Canadian Credit Agreement dated as of August 29, 2000
(as amended, supplemented, or restated to the date hereof, the "Original
Agreement"), for the purpose and consideration therein expressed, whereby
Canadian Lenders became obligated to make loans to Canadian Borrowers as therein
provided;

         WHEREAS, on January 1, 2001 Northstar Energy, Devon Energy Canada
Holding Corporation (the successor by amalgamation to Devon Energy Canada) and
certain other Alberta corporations, all of which were Subsidiaries of US
Borrower, amalgamated under the name Northstar Energy Corporation (defined above
as the "Canadian Borrower") which is now the sole Canadian Borrower;

         WHEREAS, Canadian Borrower, Canadian Agent and Canadian Lenders desire
to amend the Original Agreement as set forth herein;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original Agreement, in
consideration of the loans which may hereafter be made by Canadian Lenders to
Canadian Borrower, and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto do hereby
agree as follows:

                                       1
<PAGE>   2

                                   ARTICLE I.

                           Definitions and References

         Section 1.1. Terms Defined in the Original Agreement. Unless the
context otherwise requires or unless otherwise expressly defined herein, the
terms defined in the Original Agreement shall have the same meanings whenever
used in this Amendment.

         Section 1.2. Other Defined Terms. Unless the context otherwise
requires, the following terms when used in this Amendment shall have the
meanings assigned to them in this Section 1.2.

              "Amendment" means this Second Amendment to Canadian Credit
Agreement.

              "Canadian Agreement" means the Original Agreement as amended
hereby.

                                   ARTICLE II.

                        Amendments to Original Agreement

         Section 2.1. Defined Terms. The following additional defined terms are
hereby added to Annex I of the Original Agreement in appropriate alphabetical
order to read as follows:

              "Devon Stock Repurchases" the purchase, redemption, or other
              acquisition for value by US Borrower of shares of its Common
              Stock, par value $0.10.

              "Repurchased Devon Stock" means the shares of US Borrower's Common
              Stock, par value $0.10, repurchased by US Borrower pursuant to
              Devon Stock Repurchases.

         Section 2.2. Use of Proceeds. The next to last sentence of Section 1.4
of the Original Agreement is hereby deleted and the following new sentence is
hereby substituted therefor:

         "In no event shall the funds from any Canadian Loan or any Letter of
         Credit be used directly or indirectly by any Person for personal,
         family, household or agricultural purposes or for the purpose, whether
         immediate, incidental or ultimate, of purchasing, acquiring or carrying
         any "margin stock" (as such term is defined in Regulation U promulgated
         by the Board of Governors of the Federal Reserve System) or to extend
         credit to others directly or indirectly for the purpose of purchasing
         or carrying any such margin stock; provided that Canadian Borrower may
         extend credit to US Borrower, directly or indirectly, to be used to
         make Devon Stock Repurchases in compliance with the US Agreement."

         Section 2.3. Limitation on Restricted Payments. Section 7.5 of the
Original Agreement is hereby amended in its entirety to read as follows:

                                       2
<PAGE>   3

                  "Section 7.5. Limitation on Restricted Payments. The aggregate
         amount of Restricted Payments made by the Restricted Persons during any
         Fiscal Year shall not exceed twenty percent (20%) of the book value of
         the Consolidated Assets of US Borrower as of the end of the immediately
         preceding Fiscal Year, as adjusted to take into account any increase
         associated with an acquisition or merger."

         Section 2.4. Disclosure Schedule. Paragraph 6 of the Disclosure
Schedule to the Original Agreement is hereby deleted and replaced by the list
set forth in Schedule 1, on which the following two new Subsidiaries have been
added: Tall Grass Gas Services, L.L.C. and Devon Energy Charitable Foundation.

                                  ARTICLE III.

                           Conditions of Effectiveness

         Section 3.1. Effective Date. This Amendment shall become effective as
of the date first above written when and only when:

         (a) Canadian Agent shall have received all of the following, at
Canadian Agent's office, duly executed and delivered and in form and substance
satisfactory to Canadian Agent, all of the following:

                  (i) this Amendment executed by Canadian Borrower, Canadian
         Agent and Canadian Required Lenders;

                  (ii) a certificate of the Chairman of the Board, President, or
         Vice President - Finance of Canadian Borrower dated the date of this
         Amendment certifying: (i) that all of the representations and
         warranties set forth in Article IV hereof are true and correct at and
         as of such date, and (ii) that no Default exists at and as of such
         date.

         (b) Canadian Borrower shall have paid, in connection with such Canadian
Loan Documents, all fees and reimbursements to be paid to Canadian Agent
pursuant to any Canadian Loan Documents, or otherwise due Canadian Agent and
including fees and disbursements of Canadian Agent's attorneys.

                                  ARTICLE IV.

                         Representations and Warranties

         Section 4.1. Representations and Warranties of Canadian Borrower. In
order to induce each Canadian Lender to enter into this Amendment, Canadian
Borrower represents and warrants to each Canadian Lender that:

                                       3
<PAGE>   4

         (a) The representations and warranties contained in Article V of the
Original Agreement are true and correct at and as of the time of the
effectiveness hereof, except to the extent that the facts on which such
representations and warranties are based have been changed by the extension of
credit under the Canadian Agreement.

         (b) Canadian Borrower is duly authorized to execute and deliver this
Amendment and is and will continue to be duly authorized to borrow monies and to
perform its obligations under the Canadian Agreement. Canadian Borrower has duly
taken all corporate action necessary to authorize the execution and delivery of
this Amendment and to authorize the performance of the obligations of Canadian
Borrower hereunder.

         (c) The execution and delivery by Canadian Borrower of this Amendment,
the performance by Canadian Borrower of its obligations hereunder and the
consummation of the transactions contemplated hereby do not and will not (i)
conflict with any provision of (A) any Law, (B) the organizational documents of
Canadian Borrower, or (C) any agreement, judgment, license, order or permit
applicable to or binding upon Canadian Borrower unless such conflict would not
reasonably be expected to have a Material Adverse Effect, or (ii) result in or
require the creation of any Lien upon any assets or properties of Canadian
Borrower which would reasonably be expected to have a Material Adverse Effect,
except as expressly contemplated or permitted in the Loan Documents. Except as
expressly contemplated in the Loan Documents no consent, approval, authorization
or order of, and no notice to or filing with, any Tribunal or third party is
required in connection with the execution, delivery or performance by Canadian
Borrower of this Amendment or to consummate any transactions contemplated by
this Amendment, unless failure to obtain such consent would not reasonably be
expected to have a Material Adverse Effect.

         (d) When duly executed and delivered, each of this Amendment and the
Canadian Agreement will be a legal and binding obligation of Canadian Borrower,
enforceable in accordance with its terms, except as limited by bankruptcy,
insolvency or similar laws of general application relating to the enforcement of
creditors' rights and by equitable principles of general application.

         (e) The audited annual Consolidated financial statements of US Borrower
dated as of December 31, 2000 and the unaudited quarterly Consolidated financial
statements of US Borrower dated as of March 31, 2001 fairly present the
Consolidated financial position at such dates and the Consolidated statement of
operations and the changes in Consolidated financial position for the periods
ending on such dates for US Borrower. Copies of such financial statements have
heretofore been delivered to each Canadian Lender. Since such dates no material
adverse change has occurred in the financial condition or businesses or in the
Consolidated financial condition or businesses of US Borrower.

                                       4
<PAGE>   5
                                   ARTICLE V.

                                  Miscellaneous

        Section 5.1. Ratification of Agreements. The Original Agreement as
hereby amended is hereby ratified and confirmed in all respects. The Canadian
Loan Documents, as they may be amended or affected by this Amendment, are hereby
ratified and confirmed in all respects. Any reference to the Canadian Agreement
in any Loan Document shall be deemed to be a reference to the Original Agreement
as hereby amended. The execution, delivery and effectiveness of this Amendment
shall not, except as expressly provided herein, operate as a waiver of any
right, power or remedy of Canadian Lenders under the Canadian Agreement, or any
other Canadian Loan Document nor constitute a waiver of any provision of the
Canadian Agreement, or any other Canadian Loan Document.

         Section 5.2. Survival of Agreements. All representations, warranties,
covenants and agreements of Canadian Borrower herein shall survive the execution
and delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full. All statements and agreements contained
in any certificate or instrument delivered by Canadian Borrower or any
Restricted Person hereunder or under the Canadian Agreement to any Canadian
Lender shall be deemed to constitute representations and warranties by, and/or
agreements and covenants of, Canadian Borrower under this Amendment and under
the Canadian Agreement.

         Section 5.3. Canadian Loan Documents. This Amendment is a Canadian Loan
Document, and all provisions in the Canadian Agreement pertaining to Canadian
Loan Documents apply hereto and thereto.

         Section 5.4. Governing Law. This Amendment shall be governed by and
construed in accordance the laws of the Province of Alberta and any applicable
laws of Canada in all respects, including construction, validity and
performance.

         Section 5.5. Counterparts; Fax. This Amendment may be separately
executed in counterparts and by the different parties hereto in separate
counterparts, each of which when so executed shall be deemed to constitute one
and the same Amendment. This Amendment may be validly executed by facsimile or
other electronic transmission.

         THIS AMENDMENT AND THE OTHER CANADIAN 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 OF THE PARTIES.

         [THE REMAINDER OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

                                       5
<PAGE>   6

IN WITNESS WHEREOF, this Amendment is executed as of the date first above
written.

                                            NORTHSTAR ENERGY CORPORATION
                                            Canadian Borrower

                                            By: /s/ Paul Brereton
                                                -------------------------------
                                                    Paul Brereton
                                                    Vice President - Finance

                                            ABN AMRO BANK CANADA
                                            Lender

                                            By: /s/
                                                -------------------------------
                                            Name:
                                            Title:

                                            By: /s/
                                                -------------------------------
                                            Name:
                                            Title:

                                            BANK OF AMERICA CANADA
                                            Administrative Agent, Canadian LC
                                            Issuer and Lender

                                            By: /s/ Donald R. Chang
                                                -------------------------------
                                            Name:   Donald R. Chang
                                            Title:  Vice President
                                            Corporate Investment Banking

                                            BANK OF TOKYO - MITSUBISHI (CANADA)
                                            Lender

                                            By: /s/
                                                -------------------------------
                                                Name:
                                                Title:

                                            BANK ONE, NA CANADA BRANCH
                                            Lender

                                            By: /s/ Jeanie C. Harman
                                                -------------------------------
                                            Name:   Jeanie C. Harman
                                            Title:  First Vice President

                                       6
<PAGE>   7

                                            BAYERISCHE LANDESBANK GIROZENTRALE,
                                            CAYMAN ISLANDS BRANCH
                                            Lender

                                            By: /s/ Hereward Drummond
                                            -----------------------------------
                                            Name:   Hereward Drummond Title:
                                            Senior  Vice President

                                            By: /s/ James H. Boyle
                                               --------------------------------
                                            Name:   James H. Boyle
                                            Title:  Vice President

                                            CANADIAN IMPERIAL BANK OF COMMERCE
                                            Lender

                                            By: /s/ Joelle Schellenberg
                                               --------------------------------
                                            Name:   Joelle Schellenberg
                                            Title:  Director

                                            By: /s/ Chris A. Perks
                                               --------------------------------
                                            Name:   Chris A. Perks
                                            Title:  Executive Director

                                            CITIBANK CANADA
                                            Lender

                                            By: /s/
                                                -------------------------------
                                            Name:
                                            Title:

                                            CREDIT LYONNAIS NEW YORK BRANCH
                                            Lender

                                            By: /s/ Philippe Soustra
                                               --------------------------------
                                            Name:   Philippe Soustra
                                            Title:  Executive Vice President

                                       7
<PAGE>   8

                                            DEUTSCHE BANK AG NEW YORK AND/OR
                                            CAYMAN ISLANDS BRANCH Lender

                                            By: /s/ Hans C. Narberhaus
                                                -------------------------------
                                            Name:   Hans C. Narberhaus
                                            Title:  Vice President

                                            By: /s/ David G. Dickinson, Jr.
                                               ---------------------------------
                                            Name:   David G. Dickinson, Jr.
                                            Title:  Vice President

                                            FIRST UNION NATIONAL BANK
                                            Lender

                                            By: /s/ Robert R. Wetteroff
                                               ---------------------------------
                                            Name:   Robert R. Wetteroff
                                            Title:  Senior Vice President

                                            J.P. MORGAN CANADA
                                            Lender

                                            By:/s/  Leigh Knowles
                                               --------------------------------
                                            Name:   Leigh Knowles
                                            Title:  VP & Controller

                                            ROYAL BANK OF CANADA
                                            Lender

                                            By: /s/ Lorne A. Gartner
                                               ---------------------------------
                                            Name:   Lorne A. Gartner
                                            Title:  Vice President

                                            SUNTRUST BANK, ATLANTA
                                            Lender

                                            By: /s/
                                               ---------------------------------
                                            Name:
                                            Title:

                                            By: /s/
                                               ---------------------------------
                                            Name:
                                            Title:

                                       8
<PAGE>   9

                                            THE BANK OF NEW YORK
                                            Lender

                                            By: /s/ Raymond J. Palmer
                                               --------------------------------
                                            Name:   Raymond J. Palmer
                                            Title:  Vice President

                                            THE CHASE MANHATTAN BANK
                                            Lender

                                            By: /s/
                                                -------------------------------
                                            Name:
                                            Title:

                                            THE FUJI BANK, LIMITED
                                            Lender

                                            By: /s/ Jacques Azagury
                                                -------------------------------
                                            Name:   Jacques Azagury
                                            Title:  Senior Vice President &
                                                    Manager

                                            UMB BANK
                                            Lender

                                            By: /s/ Richard J. Lehrter
                                               ---------------------------------
                                            Name:   Richard J. Lehrter
                                            Title:  Community Bank President

                                            WESTDEUTSCHE LANDESBANK GIROZENTRALE
                                            Lender

                                            By: /s/
                                                -------------------------------
                                            Name:
                                            Title:

                                            By: /s/
                                                --------------------------------
                                            Name:
                                            Title:

                                       9
<PAGE>   10

                                                                     SCHEDULE 1

                        AMENDMENT TO DISCLOSURE SCHEDULE

         6. Section 5.11 US Borrower's Subsidiaries: The following entities are,
directly or indirectly, wholly owned by US Borrower (unless otherwise noted):

                  Devon Energy Corporation (Oklahoma), an Oklahoma corporation

                  Devon Energy Management Company, L.L.C.
                  Devon Financing Trust II

                  DBC, Inc., an Oklahoma corporation

                  Devon Holding Corporation, f/k/a/ Devon Acquisition
                  Corporation, a Delaware corporation

                  Devon Production Corporation, a Nevada corporation

                  Catclaw Pipeline, Inc., an Oklahoma corporation

                  Northstar Energy Corporation (100% of common shares)

                  Devon Energy Canada, Ltd.

                  Devon Energy Insurance Company Limited

                  Richland Development Corporation

                  Canoa Ranch Corporation

                  Richland Transition Company

                  Strategic Trust Company

                  Vermejo Park Corporation

                  Vermejo Minerals Corporation

                  Devon Financing Trust (100% of common securities)

                                       10
<PAGE>   11

                  Thunder Creek Gas Services, L.L.C. (75%)

                  Sage Creek Processors, L.L.C.

                  American Sulphur Export Corporation (50%) which owns 100% of
                  Amsulex, Inc.

                  Foothills Partnership (1%)

                  Morrison Nuclear Inc.

                  Devon Energy Partners A Limited Partnership

                  Mountain Energy Inc.

                  Northstar Energy Partnership

                  Devon Energy Production Company, L.P.

                  Bonito Pipe Line Company

                  Cachuma Gas Processing Company

                  Canyon Reef Carriers, Inc.

                  Capitan Oil Pipeline Company

                  Pennzoil Energy Marketing Company

                  Pennzoil Gas Marketing Company

                  Devon Energy International Company

                  Pennzoil Asiatic Inc.

                  Devon Energy Egypt, Inc.

                  Pennzoil Qatar Inc.

                  Azerbaijan International Operating Corporation (5%)

                  Caspian International Petroleum Company (30%)

                  Devon Energy Beni Suef Inc.

                                       11
<PAGE>   12

                  Devon Energy Caspian Corporation

                  Pennzoil Caspian Development Corporation

                  Devon Energy Exploration Brazil, Inc.

                  Devon Energy Brasil, Ltda.

                  Devon Energy Qatar Production, Inc.

                  Devon Energy Red Sea, Inc.

                  Fanar Petroleum Company (50%)

                  Devon Energy Sinai, Inc.

                  Devon Energy Suez, Inc.

                  Pennzoil Venezuela Corporation SA

                  Nueces Intrastate Pipe Line Company

                  Devon Energy Intrastate Pipeline Company

                  Devon Energy Offshore Pipeline Company

                  Devon Energy Petroleum Pipeline Company

                  Pennzoil Petroleums Ltd.

                  Pennzoil Resources Canada Ltd.

                  PennzEnergy (U.K.) Company

                  Pepco Partners, L.P. (20%)

                  Sisquoc Gas Pipeline Company

                  Tiburon Transport Company

                  892306 Alberta Ltd..

                  Canadian Gas Gathering Systems II, Inc.

                                       12
<PAGE>   13

                  167496 Canada Ltd. (64%)

                  Devon-Blanco Company

                  Morrison Gas Gathering Inc.

                  Morrison Operating Company Ltd.

                  Morrison Petroleums, Ltd.

                  Northstar Energy Inc.

                  Richland Properties Company, L.L.C.

                  BN Coal, L.L.C.

                  BN Non-Coal, L.L.C.

                  B&N Co. A Limited Partnership

                  Blackwood & Nichols Co. A Limited Partnership

                  Devon SFS Operating, Inc. (formerly Devon Merger Co./Santa Fe
                  Snyder Corporation)

                  Santa Fe Platform Management, Inc.

                  Security Purchasing, Inc.

                  Snyder Fluid Technology, Inc.

                  Snyder Gas Marketing, Inc.

                  SOCO Technologies, Inc.

                  SOCO Gas Systems, Inc.

                  SOCO Louisiana Leasing, Inc.

                  Adobe Offshore Pipeline Company

                  Santa Fe Pacific Fuels Company

                  Mexican Flats Service Company, Inc.

                                       13
<PAGE>   14

                  Wyoming Gathering and Production Company, Inc.

                  SOCO International, Inc.

                  SOCO International Holdings, Inc.

                  Santa Fe Energy Resources (Delaware), Ltd.

                  SFERI, Inc.

                  Santa Fe Energy Resources of Ghana, Ltd.

                  Santa Fe Energy Resources International, Ltd.

                  Santa Fe Energy Resources (New Ventures II), Ltd.

                  Santa Fe Energy Resources (New Ventures III), Ltd.

                  Santa Fe Energy Resources (New Ventures IV), Ltd.

                  Santa Fe Energy Resources (Cote D'Ivoire) Ltd.

                  Santa Fe Energy Resources Port Bouet Ltd.

                  Santa Fe Energy Resources (Bermuda) Limited.

                  Santa Fe Energy Resources Kepala Burung Limited

                  Santa Fe Energy Resources Bangko Ltd.

                  Santa Fe Energy Resources Pagatan Ltd.

                  Santa Fe Energy Resources of China, Ltd.

                  Santa Fe Energy Resources of Malaysia, Ltd.

                  Santa Fe Energy Resources (Thai Holding), Ltd.

                  Santa Fe Energy Resources (Thailand), Ltd.

                  Santa Fe Energy Resources Congo, Ltd.

                  Santa Fe Energy Resources Gabon (Agali), Ltd.

                                       14
<PAGE>   15

                  Santa Fe Energy Resources (Brazil Holdings I), Ltd.

                  Santa Fe Energy Resources (Brazil Holdings II), Ltd.

                  SFR Petroleo Do Brazil Ltda.

                  SFS (International), Ltd.

                  SFS (Holdings), Ltd.

                  Santa Fe Energy Resources (Jabung), Ltd.

                  Santa Fe Energy Resources Limited

                  Santa Fe Energy Resources of Gabon, Ltd.

                  Petrolera Santa Fe S.A.

                  Braemar Shipping Company Limited

                  Santa Fe Energy Resources South East Asia Limited

                  746481 Alberta Ltd.

                  Trend Exploration (PNG) Party Ltd.

                  Santa Fe Energy Resources of Gabon (Mondah Bay), Ltd.

                  Santa Fe Energy Resources of Canada, Inc.

                  Santa Fe Energy Resources of Myanmar, Ltd.

                  Petrolera Santa Fe (Columbia), Ltd.

                  Santa Fe Energy Resources of Peru, Ltd.

                  Santa Fe Energy Resources of Bolivia, Inc.

                  Santa Fe Energy Company of Argentina

                  Trend Argentina S.A.

                  Santa Fe Energy Resources of Morocco, Ltd.

                                       15
<PAGE>   16

                  Gulf Coast American Corp.

                  SFS Malta One, Inc.

                  SFS Malta Two, Inc.

                  SFS (France) SARL

                  Ceara Star (Malta) Ltd.

                  SFS Malta Holding Company Ltd.

                  SFS Malta International Trading Company Ltd.

                  Tall Grass Gas Services, L.L.C.

                  Devon Energy Charitable Foundation

                                       16

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