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A turbodrill is a tool used mostly by petrochemical companies to dig wells for crude oil and natural gas reserves. == History of turbodrilling == *Among the technical breakthroughs in the world oil industry in the 1920s, a special place is held by the invention in 1922 of the reduction-geared, single-stage downhole turbodrill motor by the Russian engineer Matvei Kapelyushnikov, which opened the way for the subsequent mass introduction of turbodrilling in the industry. *In 1924 the first US Patent was issued to a company called Scharpenberg for the first multi-staged turbodrill. *In 1982 the first steerable turbodrill was developed by a company called Neyrfor. This was steerable because it had a stabilizer that was offset from the rest, pulling the tool to one particular side. Using the law of inertia, one could alter the direction of the hole being drilled by changing the direction of the offset. *In 1992 the first steerable turbodrill using a bent housing was created by ''Neyrfor''. The advantage to using the bent housing method of steering instead of an offset stabilizer, is that it provided a straighter hole with less of a corkscrew effect, which in turn made drilling more efficient, faster, and more accurate. *Continuing traditions of Russian engineer Matvey Kapelyushnikov the company (JSC "NGT" ) constantly improves designs of turbodrills. 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「Turbodrill」の詳細全文を読む スポンサード リンク
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