Wolverine sold a working interest in their 100 square mile drilling unit incorporating Covenant to Oxy following the discovery.

FORBES: Texas Tycoon Earns Another Billion-Dollar Payday Dealing Marcellus Shale Acres to Chevron

The rate was 0.97 for the Gulf drilling unit, over the target of 0.62, say minutes of an August 2009 meeting.

WSJ: As CEO Hayward Remade BP, Safety, Cost Drives Clashed

Bankston, nominated by the United States of America, for placing their own lives at risk while rescuing survivors from the Deepwater Horizon Mobile Offshore Drilling Unit, in the Gulf of Mexico, following a devastating explosion on the rig in April 2010.

FORBES: Korean Ship Captain Honored for Extraordinary Bravery at Sea

Executive Order 13554 of October 5, 2010, was issued after the blowout and explosion of the mobile offshore drilling unit Deepwater Horizon that occurred on April 20, 2010, and resulted in the largest oil spill in U.S. history (Deepwater Horizon Oil Spill).

WHITEHOUSE: Executive Order -- Gulf Coast Ecosystem Restoration

Brooklyn, New York (Motherboard.tv) -- In April of last year the Deepwater Horizon semi-submersible Mobile Offshore Drilling Unit exploded in the Gulf of Mexico, killing 11 men, injuring 17 others and triggering what is generally recognized as one of the greatest human errors ever made and officially the largest unforeseen marine oil catastrophe since people started drilling for oil.

CNN: Robotic sailboats built to clean up oil spills

Chevron has never made a pretense of playing nice with the U.S. lawyers suing it over pollution left over from when its Texaco unit was drilling for oil in the jungles of Ecuador.

FORBES: Chevron Says Ecuador Pollution Records Fabricated

They generally require the drillers to file a plan for royalty-sharing when the drilling permit is issued for a specific unit, based upon known geometry of hydrocarbon reservoirs and surface area.

FORBES: Shale Leases: Promised Land

The story begins in 1992, when an army unit from Lanzhou in neighbouring Gansu province, drilling with state permission, made a decent oil find in Jingbian county.

ECONOMIST: In rural China, a private oil boom became a state-owned one