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''Deepwater Horizon'' was an ultra-deepwater, dynamically positioned, semi-submersible offshore oil drilling rig〔 owned by Transocean. Built in 2001 in South Korea by Hyundai Heavy Industries,〔 the rig was commissioned by R&B Falcon, which later became part of Transocean,〔 - date of publication verifiable onhttp://www.highbeam.com/doc/1G1-69685498.html〕 registered in Majuro, Marshall Islands, and leased to BP from 2001 until September 2013.〔 In September 2009, the rig drilled the deepest oil well in history at a vertical depth of and measured depth of in the Tiber Oil Field at Keathley Canyon block 102, approximately southeast of Houston, in of water. On 20 April 2010, while drilling at the Macondo Prospect, an explosion on the rig caused by a blowout killed 11 crewmen and ignited a fireball visible from away. The resulting fire could not be extinguished and, on 22 April 2010, ''Deepwater Horizon'' sank, leaving the well gushing at the seabed and causing the largest oil spill in U.S. waters. ==Design== ''Deepwater Horizon'' was a fifth-generation, RBS-8D design (i.e. model type), deepwater, dynamically positioned, column-stabilized, semi-submersible mobile offshore drilling unit, designed to drill subsea wells for oil exploration and production using an , blowout preventer, and a outside diameter marine riser.〔(【引用サイトリンク】 title=Fleet Specifications: Deepwater Horizon )〕 ''Deepwater Horizon'' was the second semi-submersible rig constructed of a class of two, although ''Deepwater Nautilus'', its predecessor, is not dynamically positioned. The rig was and capable of operating in waters up to deep, to a maximum drill depth of ,〔 and in 2010 was one of approximately 200 deepwater offshore rigs capable of drilling in waters deeper than . Its American Bureau of Shipping (ABS) class notations were "A1, Column Stabilized Drilling Unit, AMS, ACCU, DPS-3".〔 In 2002, the rig was upgraded with "e-drill", a drill monitoring system whereby technical personnel based in Houston, Texas, received real-time drilling data from the rig and transmitted maintenance and troubleshooting information. Advanced systems played a key role in the rig's operation, from pressure and drill monitoring technology, to automated shutoff systems and modelling systems for cementing. The OptiCem cement modelling system, used by Halliburton in April 2010, played a crucial part in cement slurry mix and support decisions. These decisions have become a focus for investigations into the explosion on the rig that month. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Deepwater Horizon」の詳細全文を読む スポンサード リンク
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