Well pump having a plunger in contact with well and pump fluid

Details Well pump having a plunger in contact with well and pump fluid Well pump having a plunger in contact with well and pump fluid

1996-05-02

1998-07-28

Sheikh, Ayaz R.

Pumps

Condition responsive control of pump drive motor

By controlling drive motor motive fluid

417 56, 417 58, F04B 4900, F04B 4712

Patent

active

057855005

ABSTRACT:
A pump apparatus for use in a pump system of a well capable of exerting and releasing pressure on a pump fluid supplied to the pump apparatus. The pump apparatus includes a tubular body having a pump fluid space for communicating with the pump fluid and a chamber for receiving unpumped well fluid and for furnishing pumped well fluid to a wellhead of the well, wherein the pump fluid and the pumped well fluid remain separated. The pump apparatus includes a device located inside the tubular body and in contact with the pump fluid space for displacing the pumped well fluid from the chamber to the wellhead in response to the pump system exerting pressure on the pump fluid and for receiving the unpumped well fluid from a producing formation and delivering the unpumped well fluid to the chamber in response to the pump system releasing pressure on the pump fluid.

REFERENCES:
patent: 1765457 (1930-06-01), Shutt
patent: 2253780 (1941-08-01), Gurley
patent: 3517741 (1970-06-01), Roeder
patent: 3625288 (1971-12-01), Roeder
patent: 3703926 (1972-11-01), Roeder
patent: 4421463 (1983-12-01), Lee
patent: 4492536 (1985-01-01), Gilbertson
patent: 4565496 (1986-01-01), Soderberg
patent: 4611974 (1986-09-01), Holland
patent: 4664186 (1987-05-01), Roeder
patent: 4666375 (1987-05-01), Kime
patent: 4738599 (1988-04-01), Shilling
patent: 4768589 (1988-09-01), Roeder
patent: 5104296 (1992-04-01), Roeder
patent: 5456318 (1995-10-01), Priestly

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