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...
| 出版年: | Gong-kuang zidonghua |
|---|---|
| 主要な著者: | , , |
| フォーマット: | 論文 |
| 言語: | 中国語 |
| 出版事項: |
Editorial Department of Industry and Mine Automation
2019-08-01
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| 主題: | |
| オンライン･アクセス: | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.17453 |