关键词: 可开闭, 钻头, 螺旋钻进, 筛管完孔

Abstract: Abstract: For the problems of difficulties in discharging drilling cuttings and hole collapse while drilling the drill hole along soft coal seam, this paper introduces the combination of high speed auger drilling technology and screen pipe completion，a new type of open and closed bit is developed for process demand, in the Sijiazhuang core mine of Yangquan Coal Group, 3 drill bits have been used, with 10 total drilling holes of 1057.5m, the average life of the bit is 352.5m, the maximum single hole depth 148m, the screen rate reached 99%, and the application effect is good.