高位定向长钻孔技术在古汉山矿的应用

Application of High Level Long Directional Drilling Technology in Yanmazhuang Coal Mine

为提高采空区瓦斯抽采效果和效率,利用数值模拟和现场考察相结合的方法,充分分析采空区上覆岩层破坏变化规律,确定适合古汉山矿采空区瓦斯抽采高位钻孔的合理布置层位,形成了采用千米钻机施工高位定向长钻孔抽采采空区的技术模式,提高了高位钻孔抽采效果和效率,为矿井安全生产提供了可靠保障。现场应用表明:该技术有效消除了回采工作面上隅角瓦斯聚集问题,提高了工作面回采效率,促进了瓦斯利用,经济社会效益显著。

In order to improve the efficiency and efficiency of gas drainage in goaf,the method of combining numerical simulation with on-site investigation was used to fully analyze the variation rules of overburden rock failure in goaf and to determine the suitable borehole for gas drainage in Yanmazhuang coal mine.The reasonable layout of the formation of the formation of the use of high-directional drilling rig construction of directional drilling long gob the technical mode to improve high-level drilling drainage effect and efficiency for mine safety to provide a reliable guarantee.The field application shows that this technology effectively eliminates the problem of gas accumulation in the upper corner of working face and improves the recovery efficiency of working face and promotes the utilization of gas with remarkable economic and social benefits.