钻柱的纵向振动 drill-string longitudinal vibration: 钻柱的旋转运动 drill-string rotary motion: 钻柱自转 drill-string revolve on its own axis: ..
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钻柱的旋转运动
The rotational motion of the drill string
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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