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用钢丝绳和由伺服控制液压系统操纵的平衡重举升机构而组成的高容量、高产量的抽油机,已经被研制出来。在抽油循环的任何时刻,可变的工作液控制使上、下冲程处于最经济状态,以减小抽油杆应力和平衡原动机的输入功率。样机已经经过四年的试验。此设备的其他优点为:在抽汲循环中能平衡输入功率,以减少对原动机的要求。能设计成长冲程和抽油杆负荷达45000磅,或者更多些。可以撬离井口,便于修井作业。
High-capacity, high-output pumping units with wire ropes and counterweight lifting mechanisms operated by servo-controlled hydraulic systems have been developed. At any time during the pumping cycle, variable working fluid control puts the upper and lower strokes in the most economical condition to reduce sucker rod stress and balance the input power to the prime mover. The prototype has been tested for four years. Other advantages of this device are: Balanced input power during pumping cycles to reduce the need for a prime mover. Designed to grow up to 45,000 pounds with the Sucker Rod or more. Can pry wellhead, easy to workover.