Pumps – Motor driven – Fluid motor
Patent
1990-09-26
1991-12-03
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
417401, 417390, 417388, 417383, F04B 1700, F04B 3500
Patent
active
050696025
ABSTRACT:
A low volume, hydraulic powered pump for attachment to small diameter, coiled tubing for pumping subsurface liquids from hydrocarbon formations. The pump is easily run into existing production well tubing by use of a coiled tubing unit and then connected to a power fluid pressuring apparatus. Power fluid actuates an actuator in the pump to pump liquids in the formation to the surface. The actuator has two piston heads connected by a connector rod which reciprocate in two separate chambers in the pump which are divided by a cross head seal member. A conduit in the actuator allows power fluid to be forced into the lower chamber to drive the actuator downward pumping subsurface liquids to the surface. Once the actuator completes its down stroke, pressure on the power fluid is released and the actuator is driven to its retract position by the hydrostatic pressure of the subsurface liquids pressing against the bottom surface of the upper piston head. The subsurface hydrostatic pressure acts through a piston return port in the pump housing above the cross head seal member, but beneath the upper piston head.
REFERENCES:
patent: 3123007 (1964-03-01), Orr
patent: 4295801 (1981-10-01), Bennett
patent: 4551075 (1985-11-01), Canalizo
patent: 4553910 (1985-11-01), Gosschalk
Basichas Alfred
Bertsch Richard A.
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