随着我国煤炭事业的发展 ,老矿区的后备储量已日渐减少 ,为延长矿井的服务年限 ,矿井外围扩勘尤为必要。老矿扩勘项目往往煤层埋藏较深 ,施工的钻孔较深 ,施工周期较长。由于钻孔弯曲 ,拉槽卡钻现象时有发生 ,严重地威胁着钻孔的正常施工 ,有时还会造成钻孔的报废 ,经济损失较 With the development of coal industry in our country, reserve reserves of old mining areas have been gradually reduced. To prolong the service life of mines, it is necessary to expand the periphery of mines. Old mine expansion project is often buried deep coal seam, the construction of deep drilling, construction period is longer. Due to the bending of the drill slot, the phenomenon of slotted stuck pipe sometimes occurs, which seriously threatens the normal construction of the borehole and sometimes leads to the scrap of the borehole. The economic loss is more serious