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Deepsea Delta semi-submersible drilling rig in the North Sea Comparison of deepwater semi-submersible (left) and drillship (right). A semi-submersible platform is a specialised marine vessel used in offshore roles including as offshore drilling rigs, safety vessels, oil production platforms, and heavy lift cranes.
The Songa Mercur is a semi-submersible drilling rig designed by Friede & Goldman, ex Shelf 10 and La Muralla. It is capable of drilling in water up to a depth of 1,200 feet (370 m). [2] [3] In May 2006, Songa Offshore signed a nine-month contract with Chevron to use the rig in Australia. [4]
By 1958, the number of submersible drilling rigs had increased to around 30. [2] In 1961, Shell Oil successfully converted an existing submersible rig Blue Water Rig No.1 into the first semi submersible drilling unit for operation in the Gulf of Mexico when it was found to have good stability and motions whilst being towed at a partial draught. [3]
Diamond Offshore Announces New Semisubmersible Rig Order and Three-Year Drilling Contract HOUSTON--(BUSINESS WIRE)-- Diamond Offshore Drilling, Inc. (NYSE: DO) today announced an agreement with ...
Drillships are just one way to perform various types of drilling. This function can also be performed by semi-submersibles, jackups, barges, or platform rigs. [5] Drillships have the functional ability of semi-submersible drilling rigs and also have a few unique features that separate them from all others, first being the ship-shaped design. [6]
Comparison of deepwater semi-submersible and drillship. The first offshore drillship was the CUSS 1 developed for the Mohole project to drill into the Earth's crust. [13] As of June 2010, there were over 620 mobile offshore drilling rigs (jackups, semisubs, drillships, barges, etc.) available for service in the worldwide offshore rig fleet. [14]
Transocean John Shaw was a semi-submersible drilling rig designed by Friede & Goldman as a self-propelled modified & enhanced pacesetter, built and delivered in 1982 by Mitsui Engineering & Shipbuilding Ltd. in Japan. The Panama-convenience flagged vessel was designed and outfitted to operate in harsh environments.
Scarabeo 8 is an ultra deepwater 6th generation semi-submersible drilling rigs. It is designed by Moss Maritime and its design type is CS50 MKII. [2] The rig is able to operate at the water depth up to 10,000 feet (3,000 m), which is classified by the oil industry as "ultra-deepwater", and its drilling depth is 10,660 metres (34,970 ft). [2]