针对传统水力扩孔存在的问题,研制了旋转水尾及扩孔钻头,利用钻机带动钻杆进行高压水扩孔。试验表明该套扩孔钻具适用于不同角度钻孔,扩孔排渣顺畅,扩孔后钻孔直径增大了3～9倍,显著提高了煤孔卸压、抽排瓦斯效果,具有重要的推广应用价值。 Aiming at the problems existing in the traditional hydraulic reaming, a rotary tail and a reaming drill were developed, and the drill rod was used to drive the reaming of high pressure water. The test shows that the set of reaming drills are suitable for drilling at different angles, and the reaming and slag discharging are smooth. The diameter of the drilled holes increases by 3 to 9 times after reaming, which improves the effect of relieving pressure and pumping gas drastically, which is significant The promotion of application value.