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| Research on gas extraction technology of high-level borehole in fully mechanized mining face |
| Shi Shaohua |
| Jinneng Holding Group Wajinwan Coal Company, Datong 037000, China |
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Abstract In order to ensure the effect of gas extraction in coal mining face, aiming at the problems of high gas and difficult control in the goaf of Wajinwan Coal Mine, a high-level borehole gas extraction technology is proposed and implemented. According to the subsidence characteristics of overlying strata in goaf of working face, the layout position of high-level drilling field is studied, and the technical parameters of high-level drilling construction are calculated and determined. Through the technical test of high-level borehole gas extraction in 8107 working face, and compared with the gas extraction effect of high-level roof drainage roadway, the results show that the gas concentration, pure amount and effective extraction time of high-level borehole extraction are higher than those of high-level roadway extraction.
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