Downhole, hydraulically-actuated pump and cavity having closed p

Details Downhole, hydraulically-actuated pump and cavity having closed p Downhole, hydraulically-actuated pump and cavity having closed p

1979-06-11

1981-05-19

Smith, Leonard E.

Pumps

Motor driven

Pump - motor unit raised in vertical conduit by pressure...

417404, F04B 4710

Patent

active

042682274

ABSTRACT:
A downhole, hydraulically-actuated pump of the free type which is sealingly received within a cavity in such a manner that a plurality of spaced-apart annular chambers are formed. The chambers are used in conjunction with other passageways to control flow of fluid to and from the pump and the surface of the ground. This flow system provides a closed circuit for the power fluid going to and from the engine. The power fluid to the engine end flows down the tubing string within which the pump assembly is located and to which the cavity is connected. A second conduit conducts spent power fluid from the pump assembly back uphole to the surface of the ground, thereby providing a closed circuit for the flow of power fluid to and from the pump assembly. A third conduit extends from the cavity, back up to the surface of the ground, so that produced fluid from the pump end is forced to the surface of the ground. The main body of the pump assembly includes a plurality of spaced-apart seals which cooperate with the pump cavity so that a system of passageways can be used for separating the various flow paths from one another.

REFERENCES:
patent: 1543488 (1925-06-01), Todd
patent: 2605712 (1952-08-01), Davis et al.
patent: 2818022 (1957-12-01), Kangas
patent: 3064580 (1962-11-01), Calvert et al.
patent: 3172469 (1965-03-01), Coberly et al.
patent: 3182598 (1965-05-01), McArthur et al.
patent: 3517741 (1970-06-01), Roeder
patent: 3865516 (1975-02-01), Roeder

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