在钻探工程中，每个钻孔竣工之后，要把埋在孔内几十米或更深的套管起拔出来，一直是一项比较困难的工作。鉴于水利水电钻探具有钻孔较浅、口径较大、搬家次数频繁等许多特点，因此，起拔套管的工作量特别大。把埋入钻孔的套管起拔出来重复利用，不仅大大减少了套管的消耗，而且还能为国家节约了大量的无缝钢管和资金。 In the drilling project, it is always a difficult task to pull out the casing pipe which is buried in the hole by several tens of meters or more after the completion of each drilling hole. In view of water conservancy and hydropower drilling with shallow bore, larger caliber, frequency and many other features of frequent moving, lifting the casing of the workload particularly large. Buried bored pipe from the pull out and re-use, not only greatly reduce the consumption of casing, but also for the country to save a lot of seamless steel pipe and capital.