为了提高煤矿井下瓦斯抽采孔的钻孔深度和瓦斯抽采效果,采用煤矿井下近水平定向钻技术在煤层施工近水平长钻孔、多分支孔。系统介绍了该定向钻技术及不同煤层条件下成孔方法,然后根据定向钻孔在煤层施工特点,分析在煤层施工近水平定向钻孔所面临地质条件复杂、钻孔轨迹难控制、钻孔事故复杂等技术难点,总结现场施工经验,形成一套适合定向钻孔施工的常用钻具组合、施工流程、钻孔轨迹控制等工艺方法。该定向钻技术在杜儿坪煤矿、双柳煤矿的成功应用说明其满足最大孔深大于500 m和煤层钻遇率大于90%的瓦斯抽采孔施工要求。

In order to improve the drilling depth of the gas drainage borehole and the gas drainage effect in the underground mine, the mine horizontal directional d rilling technology was applied to the horizontal long borehole drilling and the multi branch borehole drilling in seam.The directional drilling technology and the borehole accomplished method under different seam conditions were systematically introduced.Then according to the in seam construction features of the directional drilling, the complicated geological conditions, the difficult control of the dilling tracing, the complicated driling accident and other technical difficulties in the horizontal directional drilling in seam were analyzed.The site construction experiences were summarized and a completed set of the common drilling tools combination, construction procedur e, drilling tracing control and technique method suitable for the directional drilling construction were formed. The successful applications of the directional drilling technol ogy to DuDerping Mine and Shuangliu Mine showed that the max depth of the drilling could be over 500 m and over 90% of the seam drilling could meet the constructio n requirements of the gas drainage borehole.

国家科技重大专项课题资助项目(2008ZX05041-003)；