方钻杆之后带动整个钻柱进行旋转，由于方钻杆是与钻柱的顶部用丝扣连接在一起的。
The kelly then turns the entire drillstring because it is screwed into the top of the drillstring itself.
为进行打捞或回收钻柱，通常的卸开作业总是采用反扭矩，和在所选用的丝扣连接内引爆炸弹。
To facilitate the fishing or recovery operation, the backoff is usually accomplished by applying reverse torque and detonating an explosive charge inside a selected threaded connection.
将扣击板安放在B-柱上。
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