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| Analysis of gas extraction effect of directional drilling in high fracture zone of roof |
| Ren Shuaiyong |
| Shanxi Lu'an Group Heshun Liyang Coal Industry Co., Ltd., Jinzhong 032700, China |
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Abstract In order to solve the problem of gas overrun and affecting safe mining in 15303 working face of Liyang Coal Industry, based on the need of roof fracture gas control, the directional drilling gas extraction technology in high fracture zone of roof is proposed, and the drilling field and borehole are designed. The reasonable drilling technical parameters of the working face are determined, and the industrial test is carried out. The field practice results show that the maximum gas pure flow rate of single hole reaches 5.5% and the gas concentration reaches 0.2 m3/min, which effectively ensures the safe mining of working face.
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