拔出护筒：钻机可以利用专用卡具、起重索和压拔油缸进行拔出护筒作业。若钻

拔出护筒：
钻机可以利用专用卡具、起重索和压拔油缸进行拔出护筒作业。若钻机拔护筒困难时可采用起重机辅以震动锤拔出钢护筒。

結果 (英文) 1:

Pull out the casing:Drilling rigs can take advantage of special clamps, lifting cable and pull out the pull cylinder casing operations. Rig cranes can be used when pulling pipe difficulties combined with vibration hammer pull the steel casing.

結果 (英文) 2:

Unplug casing:
drilling rig can use special fixtures, lifting rope and pull pressure cylinder were pulled casing operations. If the rig may be difficult to pull the casing crane supplemented vibration hammer pulled steel casing.