「事故までの経緯(掘削中）」の編集履歴（バックアップ）一覧に戻る
事故までの経緯(掘削中） - (2010/05/12 (水) 16:47:16) のソース
2009年10月21日。MC252内のプロスペクト（石油の集積が強く期待できる構造）、『Macondo』への試掘井がスパッド（鍬入り、掘りはじめのこと）された。使用されたリグは、Semi-sub型リグのTransocean Marianasである。（余談であるが、このリグは三菱重工製のリグを改造したものである）
掘削開始後の11月、来襲したハリケーン「イーダ」によって生じたダメージの修理の為、Transocean Marianasは現場を離れた。それに代わってBPがTranseoceanからリースしたのが、Deepwater Horizonである。
Deepwater Horizonは2001年建造の、世界でも最新のリグと
[[Transocean Marianas>http://www.deepwater.com/fw/main/Transocean-Marianas-77C16.html?LayoutID=17]]
[[Deepwater Horizon>http://www.deepwater.com/fw/main/Deepwater-Horizon-56C16.html?LayoutID=17]]
http://www.subseaiq.com/(X(1)S(20gcdiiok1sxox55mm5riijz))/data/Project.aspx?project_id=562&AspxAutoDetectCookieSupport=1
On October 21, 2009, the Transocean Marianas semisub arrived on location to spud an exploration well on the Macondo prospect. Several days later drilling commenced, but was halted on Nov. 28, 2009, when the semisub underwent repairs for damage caused by Hurricane Ida. BP leased another rig, the Deepwater Horizon semisub to complete drilling operations on the well. The Deepwater Horizon semisub commenced operations in February 2010 and had recently terminated drilling at a depth of just over 18,000 feet (5,486 meters).
On Tuesday, April 20, an explosion occurred on the drilling rig. After the initial blowout occurred, the leaking wellhead continued to feed the fire onboard the semisub until the rig ultimately collapsed.
Subsequently, it was estimated the well started leaking roughly 5,000 barrels a day.
In an effort to shut off the oil leak, BP will drill a relief well using Transocean's GSF Development Driller III semisub. The operator will also drill a second relief well using Transocean's Development Driller II semisub. Both relief wells will permanently secure the Macondo exploration well.
