Large diameter high-level roof directional drilling test in complex strata
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摘要: 针对煤矿地层条件复杂，常规钻进工作量大、单孔深度不足、难以成孔、瓦斯抽采浓度低等诸多问题，开展了煤矿复杂地层中施工顶板大直径高位定向钻孔试验。以东保卫煤矿施工为依据，根据煤层顶板地质实际情况，在36号煤层顶板施工6个?120 mm大孔径顶板高位定向钻孔，其中孔深>300 m钻孔成孔率达到83.3%，最大孔深510 m。利用顶板大直径高位定向钻孔进行瓦斯抽采，其抽采浓度比原有工作面常规瓦斯钻孔抽采浓度增加66.7%，取得显著瓦斯抽采效果。顶板大直径高位定向钻孔的成功应用，为东保卫煤矿以及相似条件矿区推广应用提供了技术支撑。Abstract: In view of the complex strata conditions at Roof 36-700 in the third mining area of Dongbaowei Coal Mine， as well as the problems such as heavy workload of conventional drilling， insufficient depth of single holes， difficulty in drilling， low concentration of gas drainage， coal mine underground directional drilling equipment was tested to drill large-diameter high-level roof directional holes in complex strata in Dongbaowei Coal Mine. According to the actual geological conditions of the coal seam roof， six ?120mm high-level directional boreholes with 120mm large diameter were drilled in the roof of the 36# coal seam. The completion rate of the holes with a depth more than 300 m reached 83.3%， with the maximum hole depth up to 510m. The gas drainage concentration with large diameter high-level roof directional drilling was 66.7% higher than that with conventional drilling in the original working face， resulting in significant gas extraction effect. The successful application of large-diameter high-level roof directional drilling provides technical support for its promotion and application in Dongbaowei Coal Mine and mining areas with similar conditions.
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