U.S. DEPARTMENT OF THE INTERIORBUREAU OF LAND MANAGEMENT
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Corporate Name Change & Merger Index

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Company Name
(OLD NAME)		Changed or Merged To
(NEW NAME) 		Date of
BLM WY
Decision or
Cover Memo		BLM State
Office that
Issued
Decision
C & K Petroleum IncENSTAR Corporation07/25/1984WY
Cabello Rojo, Inc.Cabello Rojo LLC
Coal Leases Only
01/15/2009
WY
Cabot Carbon CompanyCabot Corp10/17/1960WY
Cabot Exploration CorporationCabot Oil & Gas Corp05/13/1991WY
Cabot Gasoline CorpCabot Corp10/17/1960WY
Cabot Petro CorpCabot Oil & Gas Corp05/13/1991WY
Cabot O&G Prod CorpCabot Oil & Gas Corp10/14/1997WY
Cabot Oil & Gas Western CorpCabot Oil & Gas Prod Corp10/12/1994WY
Cabot Shops IncCabot Corp10/17/1960WY
Calpine Corporation

Rosetta Resources Operating LP
    (Rights of Way Grants Only)
    (Oil & Gas Lease Only)

Application
Withdrawn
Pending

WY

WY

Calpine Natural Gas CompanyCalpine Corporation 09/26/2005 WY
Calpine Natural Gas CompanyCalpine Natural Gas Company LP09/26/2005 WY
Calpine Natural Gas Company LP Calpine Natural Gas Company09/26/2005 WY
Calpine Natural Gas L.P.

Rosetta Resources Operating L.P.
Rosetta Resources Operating L.P.

07/20/2006
07/17/2006

WY
NM

Cambridge Royalty CoGlobal Natural Res Corp of NV09/14/1988WY
Campbell, John H.Estate of John H. Campbell, Katherine Ann Campbell Del Curto successor-in-interest to the Estate05/27/2011WY
Camwest Exploration LLCStephens Energy Company LLC12/04/2003
12/10/2003		MT
WY
Can-Am Liquids Co, Ltd, a Delaware CorporationHome Petroleum Corporation05/23/1974WY
Canaan Energy Corporation
CHK Acquisition, Inc.
    (Effective June 28, 2002)
    NM Bond Decision
    WY Cover Memo.
    Amended WY Cover Memo.

04/23/2003
05/14/2003
08/22/2008

NM
WY
WY
Capoil IncMontex Exploration Company06/24/1986WY
Carmen Acquisition Corp Carmen Acquisition LLC 
    NM Bond Decision 
    WY Cover Memorandum 
    Amended WY Cover Memorandum
04/23/2003
05/14/2003
08/22/2008
NM
WY
WY
Carrollton Resources LLCPure Resources L.P.

10/11/2006
11/06/2006

MT
WY

Carter Oil CoHumble Oil & Refining Co01/28/1960ES*
Catron Harriet June, Estate of

Trust Under Will For Benefit Of Linda S. Catron
Trust Under Will For Benefit Of Courtney J. Catron Jr

03/03/1986

WY
CDX Frontier LLCCDX Resources LLC 07/27/2006NM
CDX Gas LLCVitruvian Exploration LLC01/27/2010
04/07/2010		CO
WY
CDX Rockies LLC

CDX Gas, LLC
CDX Gas, LLC
CDX Gas, LLC
CDX Gas, LLC (Amended Decision)

06/08/2006
07/11/2006
07/17/2006
07/27/2006

UT
NM
WY
WY

CDX San Juan LLCCDX Gas, LLC 07/27/2006NM
CEI Bristol Acquisition, LP

Chaparral Energy, LLC 
    (Oil & Gas Leases Only)
Chaparral Energy, LLC 
    (Rights-of-Way Grants Only)

06/22/2006

Withdrawn 		WY
Celsius Energy CompanyQuestar Expl & Prod Co12/03/1999ES*
Cenergy Expl CoConquest Expl Co02/02/1990WY
Cenergy CorpConquest Expl Co02/02/1990WY
Cenex IncCenex Harvest States Co-Op12/01/2000WY
Centex Oil & Gas WestCenergy Exploration Co10/29/1982
06/22/1982		CO
WY
Central Ene CoCentral Transmission Systems Co01/17/1991WY
Central La Barge RoyaltiesKemmerer-La Barge Royalties LLC10/06/2003WY
Centura IncPennsylvania Castle Energy Corp03/30/1998WY
Century Chartering CoRichco Exploration Inc
    (Amended Decision-Additional Lease)
    (Amended Decision-Additional Lease)		09/13/1982
12/15/1982
02/04/1983		WY
WY
WY
Century Oil & Gas CorpCharterhall Amer Inc10/30/1990WY
CEP Interim Partners LPConvest Energy Corp11/12/1991WY
CF Braun & CompanySanta Fe Braun Inc08/13/1990WY
CH4 Energy LLC

Bill Barrett CBM, LLC 
    (Oil & Gas Leases Only) 
    (Rights-of-Way Grants Only)


08/14/2006
Withdrawn


WY
WY

Champlin Oil & Refining CoChamplin Petroleum Co10/29/1964WY
Champlin Petroleum CoUnion Pacific Resources Co07/24/1987WY
Champlin Resources CoUnion Pacific Resources Co10/22/1987WY
Chandler & Associates, Inc. Chandler & Associates LLC

10/23/1998
12/31/1998

CO
WY

Chandler & Assoc LLCShenandoah Oper Co LLC08/09/2000WY
Chaparall Energy IncChaparral Energy LLC12/26/2002WY
Chaparral Oil LLC

Chaparral Energy, LLC 
    (Oil & Gas Leases Only)
Chaparral Energy, LLC 
    (Rights-of-Way Grants Only)

06/22/2006

Pending

WY

WY
Charter Exploration and Production CoCrystal Exploration and Production Co05/11/1977
07/19/1977		WY
CO
Charterhall Amer IncAviva America Inc10/30/1990WY
Chencere Petroleum CorpAdobe Resources Corp07/10/1999WY
Cheniere Petroleum CorpAdobe Resources Corp07/10/1989WY
Chesapeake Acquisition II LLCChesapeake ORC LLC
06/11/2008		NM
WY
Chesapeake ENO Acquisition LLCChesapeake Exploration Limited Partnership (LP)
06/11/2008		NM
WY
Chesapeake EP, LLCChesapeake Exploration Limited Partnership (LP)
06/11/2008		NM
WY
Chesapeake Exploration Limited Partnership (LP)Chesapeake Exploration LLC

06/11/2008
NM
WY
Chesapeake Focus, L.L.C. Chesapeake Exploration Limited Partnership08/22/2008WY
Chesapeake KNAN Acquisition Corp

Chesapeake KNAN Acquisition LLC
    NM Bond Decision 
    WY Cover Memorandum 
    Amended WY Cover Memorandum


04/23/2003
05/14/2003
08/22/2008
NM
WY
WY
Chesapeake KNAN Acquisition, L.L.C.Chesapeake Exploration Limited Partnership08/22/2008WY
Chesapeake Merger 2000 CorpGothic Energy Corporation 
    NM Bond Decision 
    WY Cover Memorandum 
    Amended WY Cover Memorandum
04/23/2003
05/14/2003
08/22/2008
NM
WY
WY
Chesapeake Mid-Continent CorpChesapeake Exploration Limited Partnership05/21/2001NM

Chesapeake Mountain Front Corp

Chesapeake Mountain Front LLC 
    NM Bond Decision 
    WY Cover Memorandum 
    Amended WY Cover Memorandum


04/23/2003
05/14/2003
08/22/2008


NM
WY
WY

Chesapeake Mountain Front, L.L.C.Chesapeake Exploration Limited Partnership

08/22/2008

WY

Chesapeake NFW, LPChesapeake Exploration Limited Partnership (LP)

06/11/2008

NM
WY

Chesapeake ORC LLCChesapeake Exploration Limited Partnership (LP)

06/11/2008

NM
WY

Chesapeake PEP Corp.Chesapeake Exploration Limited Partnership

08/22/2008

WY

Chesapeake Permian Corporation

Chesapeake Permian LP11/29/2004NM
Chesapeake Permian LPChesapeake Exploration Limited Partnership (LP)
06/11/2008		NM
WY
Chesapeake PPC CorpChesapeake Exploration LP12/30/2005NM
Chesapeake Zapata, LPChesapeake Exploration Limited Partnership (LP)
06/11/2008		NM
WY
Cheetah Oil CompanyLOCO10/21/2005 WY
CHK Acquisition, Inc.Chesapeake KNAN Acquisition Corp 
    NM Bond Decision 
    WY Cover Memorandum 
    Amended WY Cover Memorandum


04/23/2003
05/14/2003
08/22/2008


NM
WY
WY
CIG Resources Company CIG Resources Company LLC08/17/2010WY
CIG Resources Company LLC Colorado Interstate Gas Company08/17/2010WY
CIGE Merger Company, L.L.C.El Paso Production Oil & Gas USA, L.P.08/21/2009WY
Chorney, Jeffrey D aka Jeffrey D. PrestonJeffrey D Preston Testamentary Trust & CB Community School Parent-Teacher-Student Association11/05/2002WY
Chorney, RaymondEstate of Raymond Chorney03/26/1992WY
Christmann, John JChristmann Minerals Co05/31/1996WY
Circle A Drilling CoThe Anschutz Corp, Inc05/05/1966WY
Citation 1987 Investment Limited Partnership
Citation 2002 Investment Limited Partnership
    (Oil & Gas Leases Only)
05/15/2007
05/19/2007
MT
WY

Citation 1989 Investment Limited Partnership

Citation 2002 Investment Limited Partnership
    (Oil & Gas Leases Only)
05/15/2007
05/19/2007
MT
WY
Citation 1994 Investment Limited Partnership
Citation 2002 Investment Limited Partnership
    (Oil & Gas Leases Only)
05/15/2007
05/19/2007
MT
WY
Citation 1998 Investment Limited Partnership
Citation 2002 Investment Limited Partnership
    (Oil & Gas Leases Only)
05/15/2007
05/19/2007
MT
WY

Cities Service Oil and Gas Corporation

Oxy USA, Inc.
05/16/1988
WY

Cities Service Oil Company

Cities Service Company

08/11/1981

WY

City Center Development CoBass Brothers Enterprises Inc03/11/1983WY
Clarcan PetrocorpLadd Petroleum Corp08/28/1974WY
Clark Canadian Exploration CompanyClarcan Petroleum Corporation05/14/1973WY
Cleary Petroleum Corporation
Grace Petroleum Corporation
12/12/2005NM
Cleary Petroleum Corp

Grace Petroleum Corp 
    Amended Decision-Added Lease 
    Amended Decision-Added Lease 
    Amended Decision-Added Lease

10/12/1978
11/07/1978
12/15/1978
07/02/1981

WY
WY
WY
WY

Clements Energy, Inc.

Nerco Oil & Gas, Inc.

11/06/1987

WY

CMS Oil & Gas CompanyPerenco LLC12/26/2002ES*
CMS Nomeco O&G CoCMS Oil & Gas Company08/28/2000
11/18/2002		WY
UT
CNG Development CoCNG Producing Co03/13/1991WY
CNG Producing CoDominion Expl & Prod06/02/2000
06/21/2000		UT
WY
CO2-In-ActionAmistad Land & Cattle Company, Inc.08/05/2008
08/22/2008		NM
WY
Coastal Oil & Gas CorpEl Paso Production Oil & Gas Company06/25/2001WY
Coastal Oil & Gas Resources IncEl Paso Oil & Gas Res Co LP06/26/2002WY
Coastal Oil & Gas USA LPEl Paso Production Oil & Gas USA LP11/27/2001WY
Coastal States Enterprises IncGas Producing Enterprises Inc
    (Certificate Only)		02/13/1969WY
CoEnergy Anadarko IncCoEnergy Mid-Continent Inc12/31/1997NM
CoEnergy Central Expl IncMCNIC O&G, Properties Inc12/31/1997NM
CoEnergy Enhanced Production IncMCNIC Oil & Gas Properties, Inc12/31/1997NM
CoEnergy Mid-Continent IncMCNIC O&G Mid-Continent Inc12/31/1997NM
CoEnergy Operating CoCoEnergy Mid-Continent Inc12/31/1997NM
CoEnergy Rockies IncMCNIC O&G, Properties Inc12/31/1997NM
COG Acquisition CompanyCabot Oil & Gas Western Corp10/12/1994WY
COG Oil & Gas LPCOG Operating LLC03/17/2010
03/24/2010		NM
WY
Cohn, J. J.J. J. Cohn Investment Partnership & Joseph Judson Cohn Declaration of Trust01/27/2004WY
Cokeville Telephone Co IncUtah-Wyoming Telephone Co08/15/2006WY
Coline Oil CorpOil Devl Co of TX04/04/1995WY
Collins, James M.Estate of James M. Collins to Collins Oil & Gas Ltd, Dorothy Dann Collins sole general partner02/20/2009WY
Colorado Interstate Corp

Colorado Interstate Gas Co
    (Rights-Of-Way)
    (Amended Decision-Additional Leases)
    (Amended Decision-Additional Lease)
    (Amended Decision-Additional Lease)

02/19/1976
03/03/1976
04/02/1976
05/11/1977
04/06/1984		WY
WY
WY
WY
WY
Colorado Oil Co IncGas Producing Enterprises Inc12/15/1977
05/26/1978
02/03/1981		WY
WY
WY
Colt Holdings, Inc. JN Resources, Inc. 10/03/2005 WY
Colt Resources Corporation JN Resources, Inc. 10/03/2005 WY
Columbia Gas Dev CorpAviara Ene Corp10/21/1996CO
Columbia Gas Transmission CorporationColumbia Gas Transmission, LLC10/15/2010
10/22/2010		ES
WY
Columbia Natural Resources IncorporatedColumbia Natural Resources, LLC02/23/2006 
06/07/2010 		ES
WY
Columbia Natural Resources, LLCChesapeake Appalachia, LLC

Wyoming Amended Cover Memorandum

06/23/2006
08/17/2009
06/07/2010

ES
WY
WY
Columbian Fuel CorporationCities Service Oil Company09/18/1968WY

Columbian Fuel Corporation

 

Company Dissolved
Assets to Cities Service Oil Company
Amended Decision-Additional Lease

11/12/1968

 08/30/1971

WY

WY

Comstock Oil & Gas, Inc. Comstock Oil & Gas LP

03/16/2005
04/22/2005

NM
WY

Concho Exploration Inc
Concho Oil & Gas LP
Concho Resources GP LLC
Concho Resources LP LLC

Chesapeake Permian LP11/29/2004NM
Concho Oil & Gas CorpConcho Resources Inc11/29/2004NM
Concho Oil & Gas Holdings LPCOG Operating LLC03/17/2010
03/24/2010		NM
WY
Concho Resources IncChesapeake Permian Corp11/29/2004NM
Concho Resources IncDevon Permian Corp07/24/2001WY
Concise O&G PartnershipHallwood Energy Partners LP12/27/2002 MT
Conoco IncConocoPhillips Company02/14/2003
04/25/2004
07/24/2001		WY
ES
CO
Conquest Exploration Company 
American Exploration Company
    MT Notice (Oil & Gas Leases only)
    WY cover Memo. (Oil & Gas Leases only)


02/27/2008
03/13/2008


MT
WY
Conquest/N 1982 Limited Partnership
Cancelled and Inactive Conquest Exploration Company as agent
    MT Notice (Oil & Gas Leases only)
    WY cover Memo. (Oil & Gas Leases only



02/22/2008
03/13/2008



MT
WY
Conquest/P 1982 Limited Partnership
Cancelled and Inactive Conquest Exploration Company as agent
    MT Notice (Oil & Gas Leases only)
    WY cover Memo. (Oil & Gas Leases only



02/22/2008
03/13/2008



MT
WY
Conquest Seismic Services, Inc.Tesla-Conquest Inc.09/23/2010
10/05/2010		MT
WY

Consolidated Oil and Gas, Inc.

Hugoton Energy Corporation
    NM Bond Decision
    WY Cover Memorandum


03/20/1998
03/10/1999


NM
WY

Continental Oil CoConoco Inc
    (Amended Decision-Additional Leases)		02/08/1980
05/27/1980		WY
WY
Continental Pipe Line CompanyConoco Pipe Line Company04/15/1987 
Continental Resources CompanyResources Liquidating Corporation03/09/1981
11/26/1980		WY
WY
Continental Trend Resources IncContinental Res Inc10/31/1991WY
Consolidated O & G IncHugoton Energy Corp03/10/1999NM
Convest 79 Oil & GasCEP Interim Partners LP11/12/1991WY
Convest 81 IncomeCEP Interim Partners LP11/12/1991WY
Convest 82A IncomeCEP Interim Partners LP11/12/1991WY
Convest 82B incomeCEP Interim Partners LP11/12/1991WY
Convest Ene Partners LtdCEP Interim Partners LP11/12/1991WY
Convest Energy CorpForcenergy Inc03/02/1998WY
Convest Production CoConvest Energy Corp06/27/1991WY
Conwest Exploration (Delaware) IncMcMurry Oil Company11/16/2001WY
Cook, De Loyd (D.L.) K., Estate of De Loyd (D.L.) K. Cook, M. Marian Adair, Independent Executor07/06/2005 WY
Cooperative Refinery AssociationCRA Inc01/07/1965WY
Coquina Oil CorpAmer Natl Petro Co12/03/1993WY
Coral Reserves Energy CorporationCanaan Energy Corporation08/22/2008WY
Coral Reserves, Inc.Canaan Energy Corporation08/22/2008WY
Cordero Mining CompanyCordero Mining LLC
Coal Leases Only
01/15/2008
WY
Coronado Energy E&P Company, L.L.C.El Paso E&P Company, L.P.05/09/2011WY
Cortez Oil & Gas Inc

EAP Properties LP

05/17/2004
06/25/2004		MT
WY
Cortez Operating CompanyEncore Operating LP06/25/2004MT
Cosden Oil & Chemical CompanyAmerican Petrofina Company of Texas
    (Certificate Only)		06/28/1985WY
Coseka Acqstn-II IncArch Oil & Gas03/27/1990WY
Coseka Acqstn-I IncArch Oil & Gas03/27/1990WY
Coseka Res (USA) LtdArch Oil & Gas11/04/1989WY
Costilla Energy LLCCostilla Energy Inc (Original Decision)
    NM Decision
    WY Acceptance Memo		01/16/1997
03/27/1997
03/26/1999		MT
NM
WY
Costilla Petro Corp. Costilla Energy Inc. 03/03/1997MT
CP Resources IncRedwood Energy (USA) Ltd03/13/2001WY
CRA IncFarmland Industries Inc04/18/1984WY
CRA International IncPacific Enterprises Oil Company (USA)12/26/2002WY
CRA Oil Exploration CompanyTerra Resources, Inc.02/18/1981WY
Crescendo Energy LLCSlate River Resources, LLC12/05/2005
01/05/2011		UT
WY
Crescent Point US Holdings Inc.Crescent Point Energy U.S. Corp03/11/2010
03/12/2010		MT
WY
Crescent Point Energy US Inc.Crescent Point US Holdings Inc.03/11/2010
03/12/2010		MT
WY
Creslenn Oil CoDetex Oil Corp03/27/1980WY
Crestmont Management Company

Cities Service Oil and Gas Corp 
    Amended Decision

06/10/1986
06/12/1986

WY
WY

Crestmont Petroleum Company

Cities Service Oil and Gas Corp 
    Amended Decision

06/10/1986
06/12/1986

WY
WY

Crest Resources IncHenderson Petroleum Corp04/15/1982WY
Crest Resources Inc
Henderson Resources Co
    Amended Decision		04/21/1982
05/21/1982		WY
WY
Crest Resources IncPetro Atlas Corp05/22/1989WY
Cross Timbers Oil Company

XTO Energy, Inc.

Memo Accepting Utah’s Decision

06/15/2001
06/15/2001
08/23/2001		WY
UT
WY
Cross Timbers Oil Co LPNorth Timbers LP07/03/1991WY
Cross Timbers Oil Co LPEast Timbers LP07/03/1991WY
Cross Timbers Oil Co LPWest Timbers LP07/03/1991WY
Cross Timbers Oil Co LPCross Timbers Ptnrs LP07/03/1991WY
Cross Timbers Operating CompanyCrossTimbers Oil Company

Memo Accepting Utah’s Decision		06/15/2001
06/15/2001
08/23/2001		WY
UT
WY
Cross Timbers PtnrsCross Timbers Ptnrs LP07/03/1991WY
Crossroads Energy CoMelrose Energy Co04/15/1998WY
Crow Creek Energy II LLC Eagle Rock Mid-Continent Asset, LLC 11/10/2011
Pending 		NM
WY
Crusader Energy II, LLCKnight Energy Group, LLC04/29/2011
05/09/2011		NM
WY
Crusader Energy III, LLCKnight Energy Group, LLC04/29/2011
05/09/2011		NM
WY
Crystal Oil and Land CoCrystal Oil Co06/23/1969WY
Crystal Oil Co
Crystal Exploration and Production Co
    (Amended Decision)		05/11/1977
07/09/1977		WY
WY
CSL PartnersCostilla Energy Inc03/25/1997
04/04/1997
NM
WY
CSX Oil & Gas CorpTotal Minatome Corp11/04/1988WY
Cullen, Richard P.Richard P. Cullen Living Trust Dated August 16, 2001: Douglas P. Cullen & Elizabeth Kay Worlauer as Successor Co-Trustees of the Richard P. Cullen Living Trust03/03/2009WY
* Eastern States Office, Springfield VA

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Last updated: 01-09-2012