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KMC OILTOOLS INC
Changed name to Scomi Oiltools Inc. in February 2007.



HAWTHORNE OIL & GAS CORP
Acquired by Oxoco Inc in 1982



HEARN DRILLING INC
Out of business in 1998



LATERAL VECTOR RESOURCES INC
Acquired by Carpatsky Petroleum Inc. in 2001.



HELIUS ENERGY & RESOURCES LIMITED
Dissolved February 2003.



HEMSING DRILLING LTD
Acquired by Western Lakota Energy Services Inc in 2005



HEXADYNE DRILLING CORPORATION
Acquired by Patterson-UTI Energy in May 2003



HIGH PLAINS OIL CORPORATION
Merged into Adobe Resources



HIGHRIDGE EXPLORATION LTD
Acquired by Talisman Energy Inc in 1999



HIGH PLAINS ENERGY INC
Acquired by Action Energy Inc in a reverse take-over in November 2006



HITECH DRILLING SERVICES INDIA LTD
Acquired by Aban Loyd Chiles Offshore in 2001



HITWELL SURVEYS INC
Acquired by Key Energy in December 1996. See Key Energy Services Inc.



OAKMARK ENTERPRISES LIMITED
Dissolved in April 2006 through City Investing Company Liquidiating Trust after all assets were liquidated and final distributions made.



PHILLIPS PETROLEUM INTERNATIONAL TARAKAN LIMITED
Dissolved in October 1980.



HNG OIL COMPANY
Acquired along with parent Houston Natural Gas Corp by InterNorth Inc in 1985.



HOME OIL COMPANY LIMITED
Acquired by Anderson Exploration Limited in 1995.



HOME-STAKE OIL & GAS CO
Acquired by Cortez Oil & Gas Co in October 2000



HOME-STAKE ROYALTY CORP
see Home-Stake Oil & Gas Co.



HONDO DRILLING CO
Sold to Patterson Energy in 1996, see Patterson-UTI Energy Inc



HONDO OIL AND GAS COMPANY
Acquired by Devon Energy in 1992



HOUSTON EXPLORATION COMPANY
Acquired by Forest Oil Corporation in June 2007 for $750 million in cash.



HOUSTON NATURAL GAS CORPORATION
Acquired along with subsidiary HNG Oil Co by InterNorth Inc in 1985.



HOUSTON NATURAL GAS PRODUCTION COMPANY
Administrative functions and operations combined with those of Roden Oil Co to form HNG Oil Co in 1971



HOWELL CORPORATION
Acquired by Anadarko Petroleum Corp in December 2002



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