中硬煤层瓦斯抽采定向长钻孔高效钻进工艺

Efficient Drilling Technology of Long Directional Borehole for Gas Drainage in the Medium Hard Coal Seam

钻孔抽采瓦斯是治理瓦斯最直接有效的手段。根据煤矿井下本煤层定向钻进技术原理,提出一种适用于中硬煤层定向长钻孔的高效钻进工艺,该工艺是将复合钻进技术与煤矿井下定向钻进技术相结合实现定向长钻孔高效钻进的一种钻进方法。通过现场试验证明,该方法能使钻孔孔壁平滑,防止憋泵、卡钻,减少事故处理时间,提高钻孔成功率和钻进效率。经分析,使用该技术后,与常规定向钻进相比,平均机械钻速提高了26.8%,该技术为今后煤矿井下定向钻进技术的推广提供了新思路。

The gas drainage with boreholes is the most direct and effective means for gas control. According to the principle of directional drilling technology in coal mine underground,an effective drilling technology applicable to medium hard coal seam is put forward to realize effective long directional drilling by combining compound drilling technology and directional drilling technology in coal mine underground. The field test proves that this method can make the borehole wall smooth,prevent pump suffocation and sticking,reduce the accident processing time and improve the successful drilling rate and drilling efficiency. By the application of this technology,average ROP increases by 26. 8% compared with the conventional directional drilling.