大直径集束潜孔锤正循环快速扩孔钻进技术试验

Tests of Normal Circulation Rapid Reaming Technology by Large Diameter Cluster DTH Hammer

摘要:

空气潜孔锤钻进是基岩尤其是坚硬岩石地区施工首选的一种高效钻进技术。但目前国内直径大于660 mm的空气潜孔锤一次性扩孔钻进的不多，特别是660 mm的集束潜孔锤正循环一次性扩孔排渣钻进更是屈指可数。在金能2号瓦斯抽放立井的钻进试验证明，660 mm集束潜孔锤扩孔能够实现正循环一次性扩孔排渣钻进，并具有扩孔速度快、钻进效率高、施工周期短、适应性强等优点。在较坚硬的岩石地层平均钻进速度6.36 m/h，最高钻进速度9 m/h，比正循环牙轮钻头钻进速度高10倍。对矿井发生灾害事故时，可在最短时间内进行被困人员施救提供了行之有效的方法，同时，也可解决缺水地区或严重漏失地层钻进技术难题。

Abstract:

As its high construction efficiency in the bedrock, especially in the hard rock area, DTH drilling is the preferred technology. But in China, one-time reaming by DTH hammer with diameter of more than 660mm is not many, and one-time reaming and slag discharging by normal circulation cluster DTH hammer with diameter of 660mm is even fewer. The drilling test in Jinneng 2# gas drainage hole proves that reaming by use of 660mm cluster DTH hammer, one-time reaming and slag discharging with normal circulation can be realized, and there are also the advantages of rapid reaming, high drilling efficiency, short construction period and strong adaptability. The average drilling speed is 6.36m/h in hard rock formation and the highest is up to 9m/h, which is 10 times higher than normal circulation roller bit drilling. By this technology, the trapped personnel in mine disaster can be rescued in the shortest time, and drilling technical difficulties can be solved in water deficit area and serious loss zone.