Wiktionary英語版

出典：Wiktionary

kelly drive

出典:『Wiktionary』 (2024/11/01 19:07 UTC 版)

名詞

kelly drive (plural kelly drives)

  1. (oil industry) A type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal or splined outer surface.
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ウィキペディア英語版

出典：Wikipedia

Kelly drive

出典:『Wikipedia』 (2010/05/18 21:14 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

A kelly drive refers to a type of well drilling device on an oil drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table. This bushing is rotated via the rotary table and thus the pipe and the attached drill string turn while the polygonal pipe is free to slide vertically in the bushing as the bit digs the well deeper. When drilling, the drill bit is attached at the end of the drill string and thus the kelly drive provides the means to turn the bit (assuming that a downhole motor is not being used).

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