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CUDD PRESSURE CONTROL INC
Changed name to Cudd Energy Services in 2006.



TIKAL RESOURCES CORPORATION
Amalgamated with BelAir Energy Corporation in December 2001.



SEMINOLE GAS COMPANY LLC
Seminole Energy Services and affiliates Seminole Gas Company, Lakeshore Energy and North American Crude Energy Services rebranded as Continuum Energy Services LLC in June 2014.



TRILOGY RESOURCE CORPORATION
Acquired by Mannville Oil & Gas Ltd. in October 1993.



SERENPET INC
Acquired by Pembina Resources Limited in November 1996



SERVICE DRILLING CO LLC
See Serdrilco, Inc.



SERVICE DRILLING SOUTHWEST LLC
See Serdrilco, Inc.



SERVICIOS WELLTECH SA - ARGENTINA
Acquired by Key Energy in July 1997. See Key Energy Services Inc.



SEWARD COUNTY PIPELINE
Acquired in 1989 by Utilicorp United Inc which was renamed Aquila Inc in 2002, Aquila's Kansas gas assets acquired by Black Hills Corp in July 2008, see Black Hills Energy.



SHAMROCK LOGISTICS OPERATIONS LP
Changed name to Valero LP in January 2002 after Ultramar Diamond Shamrock Corp was acquired by Valero Energy Corp in December 2001



SHELL CO2 COMPANY LTD
See Kinder Morgan CO2 Company LLC



SHELL WESTERN E&P INC
Changed name to SWEPI LP.



OMINEX DE COLOMBIA
Sold to a consortium equally owned by Sinopec and ONGC Videsh in April 2007.



SHAWNEE OILS LTD
Acquired by Titan Exploration Ltd in June 2004



TRADITIONAL OIL EXPLORATION NL
See Enterprise Energy NL.



SHREVE'S WELL SERVICE
Well servicing assets acquired by Key Energy in April 1997. See Key Energy Services Inc.



SIGMOR PIPELINE COMPANY
Merged into Shamrock Logistics Operations LP in July 2000



SITTON DRILLING COMPANY
Acquired by Key Energy in January 1998. See Key Energy Services Inc.



SKEETER MACHEN WELL SERVICE
See Key Energy Services Inc



CHARLES J SLAWSON ESTATE
See Slawson Oil Company



GENE SLEDGE DRILLING CORP
Sold to Patterson Energy in October 1996, see Patterson-UTI Energy Inc



SMITH BROTHERS CASING PULLERS INC
Acquired by Basic Energy Services LP in October 1997



SNYDER OIL CORPORATION
Merged with Santa Fe Energy Resources Inc in May 1999. Name changed to Santa Fe Snyder Corporation



SQUARE ONE ENERGY INC
Acquired by Cano Petroleum Inc in March 2005



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