Hydraulic oil well pumping installation

Details Hydraulic oil well pumping installation Hydraulic oil well pumping installation

2005-01-28

2008-10-07

Kramer, Devon (Department: 3746)

Pumps

Motor driven

Fluid motor

C417S259000, C417S264000, C417S399000, C417S401000, C417S548000, C417S555200

Reexamination Certificate

active

07431572

ABSTRACT:
A hydraulic oil well pumping installation includes a down hole pump positioned down a well, the down hole pump including a master cylinder and at least one slave cylinder in axial alignment with the master cylinder. A master piston is positioned in the master cylinder and divides the master cylinder into a first portion and a second portion. A slave piston is positioned in the at least one slave cylinder and divides the slave cylinder into a first portion and a second portion. The slave piston is connected by a rigid linkage to the master piston, such that movement of the master piston results in movement of the slave piston.

REFERENCES:
patent: 2261752 (1941-11-01), Buckner
patent: 2841086 (1958-07-01), Deitrickson
patent: 4334833 (1982-06-01), Gozzi
patent: 5104296 (1992-04-01), Roeder
patent: 5651666 (1997-07-01), Martin
patent: 5807082 (1998-09-01), Skinner et al.
patent: 6193476 (2001-02-01), Sweeney
patent: WO 98/55766 (1998-12-01), None

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