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1978年我队在大坪矿区施工,地层复杂,炭质页岩较厚,套管下不到底,且经常套管下不到硬层而反脱扣.四分队钻探和机修人员,根据水压割管器的原理,研制成跟管扩孔器,经在三个矿区使用中不断改进,现已大体定型.用它解决了在缩径地层下套管的难题,加快了钻探施工进度.跟管器的结构(如附图):其连接顺序是:先把两个扩瓦(2)装
In 1978, our team was constructing in Daping Mining Area, with complicated stratum, thick carbonaceous shale, not under the casing, and under the casing, the casing was not tripped under the hard casing and the tripping unit was drilled and mechanized according to the hydraulic cutting The principle of the pipe, developed into a follow-up reamer, after continuous improvement in the use of the three mines, is now generally shape. With it to solve the problem of casing under the reduced diameter straws, to speed up the construction progress of drilling. The structure of the device (pictured): The connection sequence is: first two expansion tile (2) installed