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PAN GEO ATLAS CORPORATION
Merged with Lane-Wells Company by Dresser Industries to form Dresser Atlas in 1968.



ASCENT ENERGY INC
Acquired by RAM Energy Resources Inc. in December 2007.



DUVERNAY OIL CORPORATION
Acquired by Shell Canada Limited in August 2008.



CHARLES HILL DRILLING INC
Operating subsidiary of Knight Energy Corporation.



PRB ENERGY INC
PRB Energy Inc changed name to Black Raven Energy Inc in February 2009 in connection with reorganization / bankruptcy.



CHEVRON BRASIL LIMITADA
Operating subsidiary of Chevron Corporation in Brazi's offshore Frade Field.



RIMROCK ENERGY LLC
Majority equity interest acquired by CH4 Energy II LLC in June 2009 and relocated from its Denver company headquarters to CH4 Energy II's offices in Fort Worth, TX on July 31, 2009.



SINCRUDOS DE ORIENTE CA - SINCOR
Sincor's extra-heavy oil development operations in the Orinoco Belt were transferred to PetroCedeño SA in January 2008.



PETROLERA AMERIVEN SA
Nationalized and renamed Petropiar SA in October 2007.



PETROZUATA CA
Nationalized and renamed Petroanzoátegui SA in October 2007.



CERRO NEGRO HEAVY OIL PROJECT
Nationalized and renamed Petromonagas SA in October 2007.



HAMACA HEAVY OIL PROJECT
Formerly operated by Petrolera Ameriven SA, operated by Petropiar SA since October 2007.



PROVIDENT ENERGY LTD
Operating unit of Provident Energy Trust, see listings under Provident Energy Trust.



SCHMIDT DRILLING LP
Acquired by Mullen Group Income Fund in 2005 and combined with Cora Lynn Drilling LP in November 2006 to form Treo Drilling Services LP.



UNOCAL THAILAND LIMITED
Unocal Corp acquired by Chevron Corp in August 2005, Thailand exploration and production operations subsequently renamed Chevron Thailand Exploration and Production Ltd.



FRONTIER DRILLING I LP
Out of business in 2008.



PACIFIC STRATUS ENERGY LIMITED
Merged with Petro Rubiales Energy Corporation in January 2008 to form Pacific Rubiales Energy Corporation.



NESS ENERGY INTERNATIONAL INC
Assets acquired by OKT Resources LLC in November 2008.



BULLDOG RESOURCES INC
Acquired by Tristar Oil & Gas Ltd in February 2008.



ARMSTRONG MCLEOD AND COMPANY LTD
Acquired by Tristar Oil & Gas Ltd in August 2008.



NEW MIDLAND PETROLEUM LTD
Acquired by Tristar Oil & Gas Ltd in August 2008.



NEW CENTURY ENERGY CORPORATION
Filed Chapter 11 bankruptcy in June 2009; company dissolved.



CENTURY RESOURCES INC
Filed Chapter 11 bankruptcy in June 2009; company dissolved along with parent company New Century Energy Corporation.



PETRO RESOURCES CORPORATION
Changed name to Magnum Hunter Resources Corporation in July 2009.



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