空气(泡沫)潜孔锤钻进工艺在王家岭煤矿紧急避险孔中的应用

空气(泡沫)潜孔锤钻进工艺在王家岭煤矿紧急避险孔钻进中,有效解决了钻孔垂直度要求高、地层漏失等施工难点,实现了高质量快速成孔。该工艺平均机械钻速高达7.99 m/h,终孔水平位移仅为0.48 m,二开孔段每米综合成本504.8元。邻孔SW1水文补勘孔以泥浆作为循环介质、采用牙轮回转正循环钻进工艺,平均机械钻速为0.86 m/h,二开孔段每米综合成本为820.5元。前者平均机械钻速约是后者的9倍,较后者节约成本38.5%。与邻孔泥浆正循环牙轮回转钻进工艺相比,该工艺不仅解决了紧急避险孔施工难点,还提高了孔身质量、节约了工期、降低了成本,达到降本增效的目的,值得类似工程借鉴。

Application of Air Foam DTH Hammer Drilling Technology during the Emergency Refuge Hole Drilling in Wangjialing Coal Mine

Air foam DTH hammer drilling technology was used in the emergency refuge hole drilling in Wangjialing coal mine, by which the high verticality requirement of the borehole was met and formation leakage was effectively controlled to realize quick drilling. The achieved average penetration rate was as high as 7.99 m/h and the final hole horizontal displacement was only 0.48m with the second stage comprehensive cost 504.8RMB per meter. The mud was used as circulation medium with cone rotary positive circulation drilling technology in the adjacent SW1 additional hydrological exploration hole, the average ROP was 0.86 m/h with the second stage comprehensive cost 820.5RMB per meter. The average mechanical drilling rate of the former is about 9 times of the latter and is more economical than the latter by 38.5%. Compared with the cone rotary positive circulation drilling used in the adjacent well, by the use of air foam DTH hammer drilling technology, the difficulties in the emergency refuge hole drilling were solved with higher borehole quality, shorter construction period and lower cost to increase efficiency by reducing cost.