The problems of low drilling efficiency and low core recovery due to borehole collapse were solved with pulling in casing while drilling through using combined BHA with casing.
The hydraulic pulling tool is a hydraulic jack used on the fishing string just above the fishing tool and fastens to the casing with pulling-tool anchors.
液压提升工具是在恰好位于打捞工具上面的打捞管柱上使用的液压起重器，并用提升工具锚固定于套管。
3
A kind of ringed core pulling mechanism of injection die of plastic casing coupling is introduced.