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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Kola Superdeep Borehole ： ウィキペディア英語版 Kola Superdeep Borehole The Kola Superdeep Borehole (, ''Kolskaya sverkhglubokaya skvazhina'') is the result of a scientific drilling project of the Soviet Union in the Pechengsky District, on the Kola Peninsula, longitude and latitude coordinate: 69°23'46"N 30°36'32"E. The project attempted to drill as deep as possible into the Earth's crust. Drilling began on 24 May 1970 using the ''Uralmash-4E'', and later the ''Uralmash-15000'' series drilling rig. A number of boreholes were drilled by branching from a central hole. The deepest, SG-3, reached in 1989 and still is the deepest artificial point on Earth. In terms of true depth, it is the deepest borehole in the world. For two decades it was also the world's longest borehole, in terms of measured depth along the well bore, until surpassed in 2008 by the Al Shaheen oil well in Qatar, and in 2011 by Sakhalin-I Odoptu OP-11 Well (offshore the Russian island Sakhalin).〔 ==Drilling== The main target depth was set at . On 6 June 1979, the world depth record held by the Bertha Rogers hole in Washita County, Oklahoma, United States, at was broken. In 1983, the drill passed , and drilling was stopped for about a year for numerous scientific and celebratory visits to the site.〔 This idle period may have contributed to a breakdown on 27 September 1984: after drilling to , a section of the drill string twisted off and was left in the hole. Drilling was later restarted from . The hole reached in 1989. In that year, the hole depth was expected to reach by the end of 1990 and by 1993.〔''Kola Superdeep is in the Guinness Book of World Records'', ''Zemlya i Vselennaya'', 1989, no. 3, p.9 〕 However, because of higher-than-expected temperatures at this depth and location, instead of expected , drilling deeper was deemed infeasible and the drilling was stopped in 1992.〔 With the projected further increase in temperature with increasing depth, drilling to would have meant working at a temperature of , where the drill bit would no longer work. 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「Kola Superdeep Borehole」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.