Down hole hydraulically actuated pump

Details Down hole hydraulically actuated pump Down hole hydraulically actuated pump

1989-01-09

1990-05-15

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

F04B 4708

Patent

active

049253743

ABSTRACT:
A sub-surface hydraulically operated engine for reciprocating an oilwell pumping unit includes confined hydraulic fluid means for actuating a reversing valve and its lifter in order to change the upstroke motion to downstroke motion and vice-versa.

REFERENCES:
patent: 2631541 (1953-03-01), Dempsey
patent: 2921531 (1960-01-01), Brennan et al.
patent: 2949857 (1960-08-01), Coberly
patent: 3109379 (1963-11-01), English
patent: 3118382 (1964-01-01), English
patent: 3502028 (1970-03-01), Cooper
patent: 3865516 (1975-02-01), Roeder

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