在平原地区进行钻探施工，第四纪地层厚，下井壁管多，常常在起拔时迂到麻烦，阻力大起不动，不仅耽误了许多时间，影响着钻探生产的顺利进行；而且不得不把相当数量的井壁管丢在地下，增加了生产成本，造成不应有的浪费。几年来，我队在平原地区施工实践中体会到，要使井壁管易于起拔，关键要在 In the plains area for drilling construction, the Quaternary strata thick, well pipe wall, often in the pull out trouble, resistance immobile, not only delayed a lot of time, affecting the drilling production smoothly; and had to Throwing a considerable amount of borehole pipes underground will increase the production costs and cause undue waste. Over the past few years, my team in the plain construction practice experience, to make easy to pull the shaft wall tube pull, the key to