The problem of eccentric wear of tubing and rod strings in rod pumped Wells is very severity in recent years, and led to service frequently, pumpinspection period shorten and service cost enhanced.
近年来抽油机井管、杆之间的偏磨问题十分突出，导致作业频繁，检泵周期短，作业成本增加。
2
Inspection of the pump shaft seal ring, such as wear parts should be replaced.
检查水泵轴的油封环，如磨损严重应更换新件。
3
Each pump shall be fitted with a (stainless steel cable or stainless steel chain) of adequate strength and length to permit raising the pump for inspection and removal.