Aera – California
Alberta Energy – Canada
Conoco - Wyoming
Exxon – Louisiana
Kerr McGee – Breton Sound (GOM)
Mobil Oil– High Island (GOM)
Occidental – California
Oryx Energy – Texas
Pennzoil – Pennsylvania
Petronas Chevron – Malaysia
Power Services – Wyoming
Suriname State Oil Company – Suriname
Standard Oil – Alaska
Texaco - California
Unocal – Alaska