Research on Gas Drainage Technology of Long-distance Bedding Directional Borehole in Huoerxinhe Coal Mine

Jun Yue

《World Scientific Research Journal》 8卷7期 (2022/07) Pp. 86-91

https://doi.org/10.6911/WSRJ.202207_8(7).0013

摘要

The Long‐distance bedding directional borehole of gas drainage technology can effectively solve the gas control problem in the coal seam excavation working face under complex geological conditions. According to the phenomenon of gas overrun in the main roadway of No.3 coal seam in Huoerxinhe Coal Mine, the gas outburst control measure is adopted to pre‐evacuate the gas by the long‐distance bedding directional borehole. The results show that the gas content of test point decreases from 13.81m3/t to 7.81m3/t after 25 days of gas drainage by long‐distance bedding directional borehole, and the gas pre‐pumping rate is about 43.30%. The driving speed of the main transport roadway is 1.48 times that of the traditional ordinary drilling drainage measures, and the tunneling efficiency indicators have not exceeded. Through the application of this measure, it is confirmed that the long‐distance bedding directional borehole can effectively reduce the drilling hole construction amount and increase the gas extraction rate compared with the traditional ordinary drilling hole, and effectively eliminate the danger of protruding, and realize the safe and rapid excavation of the coal mine roadway.

關鍵字

Coal mine ； Long‐distance bedding directional borehole ； Gas extraction ； Excavation face ； Field test

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