Research on double-stage double-speed reaming drill bit for high-position and large-diameter drilling in coal mine roof

The two-stage and two-speed reaming technology can realize one time efficient reaming for the high position and large diameter directional drilling of coal mine roof, and overcome the limitations of conventional forward multistage reaming technology and method, such as heavy drilling workload, long...

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Bibliographic Details
Published in:	Meikuang Anquan
Main Authors:	Jialiang HAN, Jianlin LIU, Shengli TANG
Format:	Article
Language:	Chinese
Published:	Editorial Office of Safety in Coal Mines 2023-09-01
Subjects:	gas drainage large diameter directional drilling two-stage two-speed hole reaming process drill bit tooth design drill diameter ratio
Online Access:	https://www.mkaqzz.com/cn/article/doi/10.13347/j.cnki.mkaq.2023.09.026

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