Wells – Processes – Producing the well
Patent
1987-07-20
1989-11-14
Kisliuk, Bruce M.
Wells
Processes
Producing the well
166373, 166105, 1376255, 417431, 417554, E21B 4300, E21B 3412, F04B 2100
Patent
active
048800627
ABSTRACT:
A downhole pump is actuated by a reciprocating unit comprising a tubular rod string, a valve assembly, and a tubular plunger rod. A flow passage extends through the reciprocating unit when the valve assembly is in an "open" position, whereby liquid may be injected into the pump barrel chamber to ensure the presence of incompressible fluid in the chamber from the beginning of the up stroke, to thereby reduce or eliminate gas locking of the pump. The valve assembly, which moves together with the reciprocating unit of which it is part, is adapted to interact with a stop member on the stationary pump barrel, to initiate opening of the valve as the rod string approaches the bottom of its stroke. The valve assembly is further adapted to automatically close when lifted away from the stop shortly after the beginning of the up stroke. The valve thus remains open only during the bottoming out phase of the stroke, when only limited travel of the reciprocating unit occurs. The valve assembly is adapted to accommodate this limited travel while remaining open.
REFERENCES:
patent: 1337593 (1920-04-01), Coulson
patent: 1338907 (1920-05-01), Coulson
patent: 1338943 (1920-05-01), MacKenzie
patent: 2639674 (1953-05-01), Reese
patent: 2814992 (1957-12-01), Humason
patent: 4089626 (1978-05-01), Hill et al.
Anderson Clifford J.
Bland Linden
Johnson Ernest P.
Kisliuk Bruce M.
Murphy Oil Company Limited
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