关键词: “两高一低”煤层, 钻冲一体化, 瓦斯抽采, 水力冲孔, 卸压增透, 突出煤层

Abstract: the hydraulic pressure enhancement technology combined with drilling is an effective technique to improve the permeability of coal seams. Xintian coal mine in Guizhou mining area has the characteristics of high gas content, high pressure, and low gas permeability. For low gas drilling concentration, fast flow attenuation, long management time, and difficulty in management, the problem of efficient gas extraction can not be effectively solved. In order to improve the effect of gas extraction, shorten the gas treatment time and increase the permeability of coal seams, the hydraulic pressure reduction and increase penetration technology was implemented at the bottom of the 1404 transport ditch in the 1404 working surface, accelerating the efficiency of excavation and extraction in the 1404 coal lane, and reducing the time required for pumping and mining. It has improved the speed of coal roadway excavation and effectively eased the tense situation of "pumping, digging, and mining".