关键词: 松软破碎煤层, 定向钻机, 长钻孔, 瓦斯抽采

Abstract: Soft and broken coal seam is one of the key factors affecting gas drainage efficiency. It is difficult to maximize the drainage efficiency by using conventional bedding drilling, which seriously affects the connection of mining and drainage. In order to solve this problem, Changping Mine adopts zyl-17000d high-power directional drilling rig with torque up to 6000 n ? m, realizes the technical breakthrough of drilling length up to 300m, and the net pumping flow per meter of drilling hole reaches 0.025m3/min. Compared with ordinary bedding holes in the same area, the pumping volume is increased by 20.8 times and the construction period is shortened by 78d. The successful experiment of high-power directional drilling rig verifies that the high-power directional drilling rig meets the mechanical equipment requirements of long-distance drilling in soft and broken coal seam, and improves the effectiveness of drilling and extraction, which provides a technical reference for gas drainage in similar mines.