大直径的液压缸，通常是收缩，迫使闸板的两半一起向中间运动去密封井眼。
Large-diameter hydraulic cylinders, normally retracted, force the two halves of the cover together in the middle to seal the wellbore.
因此，可以通过钻较大直径的井眼或控制井以小产量生产来减小井筒压降损失的影响。
Therefore, we can reduce the effect of frictional loss in the wellbore by drilling well with larger diameter or producing with small production rate.
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