复杂煤岩层复合强排渣定向钻进工艺及应用

针对复杂煤岩层顶板高位孔定向钻进技术难题，提出复合强排渣定向钻进工艺，设计了以泥浆脉冲随钻测量系统与三棱螺旋钻杆为核心的强排渣定向钻具组合，分析了三棱螺旋钻杆强排渣技术原理，形成了复合强排渣定向钻进成套装备。在王坡煤矿3314采煤工作面进行了应用研究，结果表明：在以泥岩为代表的复杂顶板岩层中，完成顶板高位定向钻孔6个，成孔率达到100%，最大钻孔深度500m，日平均进尺不低于70m，累计定向钻孔进尺2325m，钻孔成孔效率与成孔率较常规定向钻进工艺大幅提升。为利用顶板高位定向长钻孔代替高抽巷进行工作面及采空区瓦斯抽采治理、保障采煤工作面的安全高效生产提供了技术支撑。

Directional drilling technology and application of composite strong slag removal in complex coal and rock strata

High level directional long drilling in coal seam roof is an important technical means of pressure relief gas drainage in coal face. Aiming at the technical problem of directional drilling of high-level hole in complex coal seam roof, a composite strong slag discharge directional drilling technology is proposed, a strong slag removal directional BHA with mud pulse while drilling measurement system and triangular spiral drill pipe as the core is designed, the principle of strong slag removal technology of triangular spiral drill pipe is analyzed, a complete set of composite strong slag discharge directional drilling equipment has been formed. The application research was carried out in 3314 coal face of Wangpo coal mine of Shanxi Tiandi Wangpo Coal Industry Co., Ltd. The results show that in the complex roof strata represented by mudstone, 6 high-level directional boreholes have been completed, the hole forming rate is 100%, the maximum drilling depth is 500m, the daily average footage is more than 70m, and the cumulative drilling footage is 2325m. The drilling efficiency and hole forming rate are greatly improved compared with the conventional directional drilling process. It provides a technical guarantee for the use of high-level directional long drilling in the roof instead of high drainage roadway to control the gas drainage in the working face and goaf, and support the safe and efficient production of the coal face.