在复杂地层中钻进,必须有效地保护孔壁.下套管是一种简单可靠的护孔方法.但是,套管在孔内长时间受钻杆的机械作用,常常会发生回扣、脱节、跑管等事故,给施工增加很大的困难. 我队在栖霞山矿区施工中,存在着比较严重的套管事故问题.据初步统计,仅1982年施工使用的套管中,就有百分之九十的套管发生回扣(按套数计),耽误了大量工时,因此,它成为我队急待解决的问题. In complex formations, drilling must be effective to protect the wall of the hole. Under the casing is a simple and reliable method of protecting the hole, but the casing in the hole for a long time by the mechanical action of the drill pipe, often occur rebate, Running and other accidents, to the construction of a great increase in my team in Qixiashan mine construction, there is a serious problem of casing accidents.According to preliminary statistics, only the casing used in construction in 1982, there is a percentage The 90th casing kickback (according to the number of sets), delayed a large number of working hours, therefore, it became my team an urgent problem to be solved.