Double-acting, downhole pump assembly

Details Double-acting, downhole pump assembly Double-acting, downhole pump assembly

1976-07-06

1978-04-18

Freeh, William L.

Pumps

Motor driven

Fluid motor

417396, 417404, 417523, F04B 1700, F04B 3500, F04B 2104

Patent

active

040849236

ABSTRACT:
A downhole, hydraulically actuated pump assembly of the free or fixed type which includes a control valve positioned above the engine, and a plurality of pistons connected together by a hollow connecting rod. The pistons are arranged to divide a production cylinder from an engine cylinder, so that the connecting rod is always placed in compression, thereby avoiding rod breakage. The hollow connecting rod is employed to supply power fluid to the lower engine, and the rod ends are arranged to have fluid pressure exerted thereagainst to improve the operation of the pump assembly.
The production pump divides the engine into an upper and lower engine assembly so that the upper engine strokes the pump in a downward direction, while the lower engine strokes the pump in an upward direction.

REFERENCES:
patent: 1880321 (1932-10-01), Jackson
patent: 2012839 (1935-08-01), Turner
patent: 2307566 (1943-01-01), Browne
patent: 3084630 (1963-04-01), Massey
patent: 3517741 (1970-06-01), Roeder

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