Design of cavity drill bit while drilling for gas drainage of crossing borehole

In order to improve gas drainage effect of crossing borehole, cavity drilling technology is often used to increase part borehole diameter of coal seam section, which avoids invalid footage of hole section in rock layer. However, due to limitation of structure of cavity drill bit, it is generally nec...

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Bibliographic Details
Published in:Gong-kuang zidonghua
Main Authors: GAO Xiaoliang, ZHANG Xianzhen, LU Qianhai
Format: Article
Language:Chinese
Published: Editorial Department of Industry and Mine Automation 2019-08-01
Subjects:
coal mining
crossing borehole
gas extraction
mechanical cavity drill bit while drilling
cavity drilling
Online Access:http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17453

Internet

http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17453

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