Gas control technology of directional high-level long borehole at upper corner
For problems that normal roof high-level borehole hardly drilled to design position because borehole direction and dip-angle cannot be controlled, and had short effective extraction hole segment, many drainage blind areas, discontinuous drainage and so on, taking upper corner gas control of Wangjial...
| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Industry and Mine Automation
2020-03-01
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| Series: | Gong-kuang zidonghua |
| Subjects: | |
| Online Access: | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.2019080005 |