方钻杆用于传递转盘或者方钻杆补心的旋转运动到钻柱上去，并允许钻柱在上提或下放的过程中旋转。
The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation.
方钻杆用于传递转盘或者方钻杆补心的旋转运动到钻柱上去，并允许钻柱在上提或下放的过程中旋转。
The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation.
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