Downhole hydraulically operated fluid pump

Wells – With eduction pump or plunger – Having liquid-gas separator

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Details

417403, 417264, E21B 4300

Patent

active

054941024

ABSTRACT:
A downhole hydraulically operated pump having a power piston reciprocated by alternating pressurized hydraulic fluid flow controlled at the surface by a hydraulic power control system which quickly reverses the flow direction. The pump housing, suspended in the well fluid of a cased well by a discharge tube, has a power piston chamber in which the power piston is housed, a production piston chamber in which a production piston is housed, and an intermediate fluid and gas collection chamber disposed therebetween. The power piston, production piston, and a suction filter are connected by an elongate hollow tubular piston rod to reciprocate together and the piston rod interior is in communication with the discharge tube. On up strokes, a series of check valves direct well fluid upwardly through the suction filter, the piston rod interior, the production piston, the production piston chamber, the piston rod interior, and into the discharge tube. Entrapped well fluid in the production piston chamber is forced upwardly through a check valve, the intermediate fluid and gas collection chamber, the interior of the piston rod and to the surface through the discharge tube. On down strokes well fluid entrapped beneath the production piston is expelled upwardly through the production piston, the piston rod interior, and into the discharge tube.

REFERENCES:
patent: 3703926 (1972-11-01), Roeder
patent: 3865516 (1975-02-01), Roeder
patent: 4214854 (1980-07-01), Roeder
patent: 4268227 (1981-05-01), Roeder
patent: 4295801 (1981-10-01), Bennett
patent: 4383803 (1983-05-01), Reese
patent: 4390326 (1983-06-01), Callicoaite
patent: 4544335 (1985-10-01), Roeder
patent: 4664186 (1987-05-01), Roeder
patent: 4720247 (1988-01-01), Strickland et al.
patent: 4925354 (1990-05-01), Carrens
patent: 5104296 (1992-04-01), Roeder

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