Pump to lift oil from bore hole - has member reciprocated by hydraulic actuator powered by hydraulic pump unit controlled in response to actuator piston, etc.

摘要

The system (1) for pumping up oil from a bore hole comprises a pump (2) having a pump member (3) in the lower end of the well and carried by a rod (4) coupled (5) to a sucker rod (6) which is reciprocated by the piston (8) of a hydraulic cylinder (9) at the surface connected (19) to a hydraulic power unit (18). Reciprocation is controlled bya control unit (23). This control is effected in response to signals from drive piston (8) position sensors (21) and a pump delivery 814) flow sensor (25) to optimise pump operation in relation to the amt. of oil available at the bottom of the well at any time.