DEEP-WELL SUCKER-ROD PUMP HYDRAULIC DRIVE Russian patent published in 2004 - IPC

FIELD: oil producing industry; deep-well pumping equipment.

SUBSTANCE: hydraulic drive of deep-well sucker-rod has hydraulic drive cylinder, tank for working liquid, pneumohydraulic accumulatorpower pump, pipelines, distributor 7 and reversing system to change direction of piston travel. Hydraulic drive is provided with booster whose low-pressure space is connected through distributor to underpiston space of hydraulic drive cylinder. High-pressure space is connected through check valve to pneumohydraulic accumulator and, through second check valve and distributor, to overpiston space of hydraulic drive cylinder. Cutoff device is installed in pipeline connecting underpiston space of cylinder with pneumohydraulic accumulator. Cutoff device is installed also in pipeline connecting high-pressure space of booster with drain line. Excess pressure discharge system includes safety valves, and reversing system includes inductive upper and lower noncontact switches interacting with rod and electromagnetic hydraulic selector operated by said switches. Said selector supplies working liquid to working members of distributor and cutoff devices. With electric motor of power pump switched on, signal is transmitted simultaneously to left-hand electromagnet of selector.

EFFECT: improved reliability of drive and increased efficiency, simplified load compensation system.

3 cl, 1 dwg