Transocean is the world’s largest offshore drilling contractor, focused on safe, effective and efficient operations. 

Offshore Fleet
Transocean owns or operates a modern, diversified fleet of 137 mobile offshore drilling rigs, including 65 jackup rigs and 68 floaters. Our floater fleet includes 54 semisubmersible rigs* and 14 drillships, and we are constructing another 10 newbuild ultra-deepwater floating rigs -- nine drillships and one semisubmersible rig.

Our offshore rigs consist of a suite of drilling equipment mounted on a hull or offshore platform. The drilling equipment comprises a derrick or mast, hoisting equipment, a rotary system, well control equipment, systems for storing, treating and pumping drilling fluids, and a power plant. Our offshore rigs generally include living quarters, cranes, heliports and storage areas. The specifications of the drilling equipment determine the drilling capabilities of the rig, and the design of the rig and its hull determines the offshore regions in which it can operate.

Our 65 jackup rigs are preferred in shallower water depths because their elevating legs, which extend from the rig's hull to the sea bottom, provide a stable drilling platform. All of our jackup rigs are cantilevered rigs capable of drilling in maximum water depths of 200 feet to 400 feet.

The company’s 42 moored semisubmersible rigs, capable of drilling in maximum water depths of 1,000 feet to 8,000 feet. Many are best suited for deepwater drilling and in harsh environments such as the North Sea sector of the United Kingdom and Norwegian Continental Shelves.

Our 26 active dynamically positioned (DP) drillships and semisubmersibles are optimizedfor ultra-deepwater exploration in moderate environments and remote areas, where their mobility and large load-carrying capability are an advantage. Our 34-unit ultra-deepwater fleet is outfitted to drill in water depths from 7,500 feet to 10,000 feet.

Moving forward to meet our clients' future needs, we are constructing eight** dynamically positioned ultra-deepwater drilling rigs -- seven drillships and one semisubmersible rig. The most advanced of these units will be capable of operating in water depths of up to 12,000 feet and constructing wells 40,000 feet deep

* Two units are owned by third parties and operated under a joint venture agreement with Caspian Drilling Company.

**Two newbuild drillships are owned by a joint venture which is 50% owned and managed by Transocean.