Dual cylinder lift pump and method of recovering fluids from...

Details Dual cylinder lift pump and method of recovering fluids from... Dual cylinder lift pump and method of recovering fluids from...

2006-06-29

2009-02-17

Neuder, William P (Department: 3672)

Wells

Processes

Producing the well

C166S072000, C417S545000

Reexamination Certificate

active

07490674

ABSTRACT:
A pump jack system for reciprocating a pump rod string is made up of a base frame and piston drive cylinders mounted on the base frame with the upper end of the pump rod connected to the cylinder assemblies, the cylinder assemblies being operated in unison by a fluid control circuit communicating with inner and outer concentric fluid passages, and the pump rod string is counterbalanced by a fluid circuit which supplies pressure in an upward direction to each of the pistons on each upstroke and substantially reduces the pressure on each downstroke, the fluid circuit being selected from an inert gas alone or an inert gas pressurizing a hydraulic fluid.

REFERENCES:
patent: 4380150 (1983-04-01), Carlson
patent: 5996688 (1999-12-01), Schultz et al.
patent: 5997181 (1999-12-01), Stanley
patent: 6460396 (2002-10-01), Smedberg et al.
patent: 6966366 (2005-11-01), Rogers, Jr.
patent: 2005/0000632 (2005-01-01), Brecheisen

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