Measurement of effective radius of gas drainage of bedding drill hole in low permeability coal seam
In view of low permeability characteristics of No.3 coal seam in Changping Coal Mine, the effective radius of gas drainage of bedding drill hole was measured and analyzed by improving sealing process with polyurethane-expansive cement and use of hole pressure method, and determined effective radius...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Industry and Mine Automation
2014-08-01
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| Series: | Gong-kuang zidonghua |
| Subjects: | |
| Online Access: | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.2014.08.023 |