顶板致裂增大煤层透气性技术试验研究

Experimental study on the technology about roof crack increasing the permeability of coal seam

为解决新安煤矿瓦斯治理难题,提高瓦斯治理水平、增强防突效果,针对该矿瓦斯抽采现状和煤层赋存特征,开展了"松软不稳定煤层顶板制裂增大瓦斯透气性试验研究",着力解决封孔成功率低、钻孔利用期短、压裂影响范围小、流量衰减快等技术难题.在14170工作面顶板钻场分别施工了压裂及导向钻孔,通过压裂钻孔注入高压流体进行压裂以达到对煤体卸压增的目的.研究结果表明:该技术能有效提高抽采钻孔的瓦斯浓度及流量,大幅提高瓦斯抽采效果,有效地降低施工区域的突出危险性;形成了一套适合新安煤矿瓦斯地质条件的卸压增透工艺技术,为有效预防煤与瓦斯突出灾害提供理论及技术支持.

Aiming at the status of gas extraction and occurrence characteristics of coal seam, this paper carried out experimental study on the technology about roof crack increasing the permeability of soft and unstable coal seam in order to solve the gas control problem of Xin-an coal mine, raise the level of gas control and strengthen the outburst prevention effect. This study focused on resolving the technical problems that hole sealing success rate is low, drilling using period is short, fracturing effect scope is small, and gas flow attenuation is fast. Fracturing and pilot hole was constructed in the roof drilling field of 14170 working face, and the high pressure fluid was injected through drilling fracturing in order to achieve the pressure relief and permeability increasing purpose. The experimental results shows that the technology can effectively improve the gas concentration and flow of gas drainage borehole, improve the effect of the gas extraction greatly and reduce the outburst danger of construction area effectively. A pressure relief anti-reflection technology was formed to provide theoretical and technical support for preventing coal and gas outburst disaster effectively.