Torsional Pendulum Drag Reduction Technology for Directional Drilling of Ultra Deep Hole in Underground Coal Mine

Aiming at the problems such as low efficiency and depth limit of directional drilling caused by the support pressure of drilling tools in the directional drilling of ultra-deep hole in underground coal mine, learning from the twist drilling technology in oil drilling, this paper analyzes the techno...

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Bibliographic Details

Published in:	Meikuang Anquan
Main Author:	JIANG Lei, XU Chao, LI Quanxin, WANG Xian
Format:	Article
Language:	Chinese
Published:	Editorial Office of Safety in Coal Mines 2020-11-01
Subjects:	drilling technology ultra-deep hole directional drilling torsional drilling torsional pendulum drag reduction
Online Access:	https://www.mkaqzz.com/cn/article/id/7031