空气潜孔锤与风冷牙轮组合钻进在穿采空区大直径抽水孔中的应用

Application of DTH Hammer and Air-cooled Roller Bit Combined Drilling Technology in Large Diameter Pumping Well Crossing Goaf

在穿多层采空区大直径抽水孔施工中,通过引入空气潜孔锤与风冷牙轮组合钻进工艺,解决了常规泥浆回转钻进钻遇多层采空区因孔内漏失无法成孔、空气潜孔锤钻进成孔孔径受限的问题。采用该工艺完成的2个(?)550mm抽水井工程均穿越4层采空区,(?)350 mm潜孔锤冲击钻进平均钻速3.31 m/h,(?)550 mm风冷牙轮扩孔钻进平均钻速2.27 m/h,在复杂地层中保持了较高的钻进效率,取得了明显的应用效果。介绍了该工艺在大同矿区(?)550mm大直径抽水井工程中的应用实例,经过实践验证了工艺的可行性,可为类似钻孔的施工提供参考。

During the construction of large diameter pumping well crossing muhi-layer goal, the leakage problem of conven- tional mud rotary drilling and the aperture limited problem of DTH hammer drilling were solved by introducing the DTH hammer and air-cooled roller bit combined drilling technology. The application of this technology in 2 Ф550mm pumping wells crossing four-layer goal indicates that the average drilling speeds of Ф350mm DTH percussive drilling and 0550mm air-cooled roller bit reaming are 3.3 lm/h and 2. 27m/h respectively. High drilling efficiency was kept in complex formation with obvious application effects. The paper introduces the application cases of Ф550mm large diameter pumping well project in Datong mining area, the practice proves the feasibility of this technology, which can be provided for similar drilling construetion.