多工艺钻进技术在塔山煤矿瓦斯抽采钻孔中的应用

Application of Multi-process Drilling Technology in Gas Drainage Borehole of Tashan Coal Mine

摘要:

大同煤矿集团公司塔山煤矿4号瓦斯抽排孔终孔口径为1200 mm，孔深423.66 m，孔底位移≯2 m。孔径大、钻孔深、精度高是本工程的主要难点。钻进施工中采用了气动潜孔锤、双壁钻杆气举反循环及组合牙轮多级扩孔等多种工艺，提高了钻进效率，保证了孔身质量，取得了良好的经济效益和社会效益。

Abstract:

The terminal diameter and depth are 1200mm and 423.66m respectively in 4# gas drainage borehole of Tashan coal mine of Datong Coalmine Group Company with displacement less than 2m. The main difficult points in this project are large borehole diameter, deep drilling and high precisiom. Multi-process of pneumatic DTH hammer, double-wall drill pipe air lift reverse circulation and combined cone multilevel reaming were adopted to improve drilling efficiency, ensure wellbore quality, and achieve good economic and social benefits.