Hydraulic multiphase pump

Pumps – Processes

Reexamination Certificate

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Details

C417S046000

Reexamination Certificate

active

10621108

ABSTRACT:
The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system. Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A power saving circuit is used to transfer energy from the extending plunger to the retracting plunger. A trim circuit is used to ensure a proper fluid level in the indexing circuit and the power saving circuit. Additionally, a rapid reversal circuit may be employed to increase the rate of the two vertically disposed plungers.

REFERENCES:
patent: 3583282 (1971-06-01), Cope
patent: 3922116 (1975-11-01), Pugh
patent: 5344290 (1994-09-01), Benckert
patent: 5622478 (1997-04-01), Elliott et al.
patent: 5634773 (1997-06-01), Tanino et al.
patent: 5660532 (1997-08-01), Castel
patent: 6126413 (2000-10-01), Berke-Jorgensen
patent: 6171075 (2001-01-01), Munzenmaier et al.
patent: 6592334 (2003-07-01), Butler
patent: 0 141 930 (1985-05-01), None
patent: 2 183 303 (1987-06-01), None

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