高位定向长钻孔技术在桃园矿采空区瓦斯治理应用

Application of High Position and Long Directional Drilling Technology for Gas Control in Goaf of Taoyuan Coal Mine

摘要:

针对工作面回采后采空区瓦斯易超限问题，采用螺杆马达结合随钻测量技术的定向钻进工艺，在桃园矿1029工作面施工了3个长距离煤层顶板大直径定向钻孔，最大孔深531 m，累计进尺1701 m（含分支孔），通过精准控制钻孔轨迹，使钻孔沿煤层顶板裂隙带延伸，有效抽采煤层回采后采空区内瓦斯，总结了一套适用于采空区瓦斯治理的高位顶板长钻孔施工方法，保障了煤矿安全高效生产。

Abstract:

Aiming at the conundrum of goaf gas excess after working face mining, 3 long-distance coal seam roof large diameter directional borehole were constructed in 1029 working face of Taoyuan mine by using the directional drilling technology combined screw motor with MWD, the maximum hole depth is 531m and the cumulative footage 1701m(contains branch holes). Through the precise control of drilling trajectory, the borehole is extended along the crack zone of the coal seam roof, the gas in the goaf is effectively extracted after the coal seam mining. This paper summarizes a set of drilling construction methods of high position and long borehole in roof for gas control in the goaf to ensure the safe and efficient production of coal mines.