Where does a gorilla drill for oil? Anywhere it wants if it is one of Rowan Companies' Gorilla-class heavy-duty offshore drilling rigs. Rowan performs contract drilling of oil and gas wells. Its fleet consists of more than 30 jack-up rigs. The company performs contract drilling y in the US, as well as the Middle East, West Africa, Mexico, the North Sea, and elsewhere. Rowan seeks to maintain its competitive edge by beefing up its current fleet of drilling rigs. It has rigs with a drilling capacity of 35,000 feet in water of 550 feet depth, although the new ultra-deepwater rigs will drill down to 40,000 feet in water depths of 12,000 feet.