As the hydraulic drive system rotates the chains, the gripper blocks feed the tubing string into, or out of the well.
当液压传动系统使链转动时，夹块将挠性管柱送入井内或将它从井内带出。
The side-abrasion failure of rod string for polymer drive pump wells is analyzed by using computer simulation method. The extension of fuzzy reliability analysis is expanded to mechanical system.
将计算机数字仿真技术引入聚驱井管杆偏磨失效模糊可靠性分析中，把模糊可靠性的分析范围扩展至机械系统。
The side-abrasion failure of rod string for polymer drive pump wells is analyzed by using computer simulation method. The extension of fuzzy reliability analysis is expanded to mechanical system.
将计算机数字仿真技术引入聚驱井管杆偏磨失效模糊可靠性分析中，把模糊可靠性的分析范围扩展至机械系统。
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