When a drill string moves upward or downward in a well, significant stress variations at the suspension point are caused by the starting and stopping of the motion.
钻柱在上提、下放的开始和终了悬点的应力要发生很大变化，其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。
When a drill string moves upward or downward in a well, significant stress variations at the suspension point are caused by the starting and stopping of the motion.
钻柱在上提、下放的开始和终了悬点的应力要发生很大变化，其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。
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