Seadrill Limited is an offshore drilling contractor. The Company is engaged in providing worldwide offshore drilling services to the oil and gas industry. Its primary business is the ownership and operation of drill ships, semi-submersible rigs, and jack-up rigs for operations in shallow to ultra-deepwater in both benign and harsh environments. Its fleet portfolio includes West Phoenix, West Aquarius, West Eclipse, Sevan Louisiana, West Capella, West Gemini, West Tellus, West Neptune, West Jupiter, West Saturn, West Carina, West Polaris, West Auriga, West Vela, West Castor, West Tucana, West Telesto, and West Elara. Its drill ships are self-propelled ships equipped for drilling offshore in water depths ranging from approximately 1,000 to 12,000 feet and are positioned over the well through a computer-controlled thruster system. Its customers include oil super-majors, state-owned national oil companies, and independent oil and gas companies. It also provides management services.