Engine end for a downhole hydraulically actuated pump assembly

Details Engine end for a downhole hydraulically actuated pump assembly Engine end for a downhole hydraulically actuated pump assembly

1990-09-04

1992-04-14

Bertsch, Richard A.

Pumps

Motor driven

Fluid motor

417404, 91304, F04B 1700

Patent

active

051042967

ABSTRACT:
A hydraulically actuated downhole pump assembly for producing a well is powered by a fluid that is pumped downhole to an engine end thereof. The pump assembly has a pump end which is connected to a source of formation fluid so that the engine end drives the pump end and the pump end lifts produced fluid to the surface of the ground. The pump end has a pump barrel and a pump piston is reciprocatingly received in sealed relationship within the pump barrel. The engine end has an outer engine barrel, and an annular valve element is reciprocatingly received in sealed relationship within the outer barrel. The valve element moves up and down between two positions of operation while an engine piston reciprocates within the annular valve element and in so doing aligns various flow passageways in a manner to alternately apply power fluid to appropriate sides of the piston and valve element to force the engine piston to reciprocate. The valve element shifts between the two alternate positions at the end of each of the engine piston strokes. This configuration of an engine end reduces the complexity of the engine end and allows loose tolerances to be used in fabricating the engine end.

REFERENCES:
patent: 2081223 (1937-05-01), Coberly
patent: 2311157 (1943-02-01), Coberly
patent: 2631541 (1953-03-01), Dempsey
patent: 2841086 (1958-07-01), Deitrickson
patent: 2983227 (1961-05-01), English
patent: 3078804 (1963-02-01), McArthur et al.
patent: 4492537 (1985-01-01), Awerkamp
patent: 4544335 (1985-10-01), Roeder
patent: 4768589 (1988-09-01), Roeder

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