Pumps – Motor driven – Fluid motor
Patent
1984-05-30
1986-09-16
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417554, F04B 4708
Patent
active
046119744
ABSTRACT:
A downhole well pump system comprises a reciprocating piston pump disposed in a fluid conduit in a wellbore which is filled with a driving fluid having a density preferably greater than the production fluid being pumped. The pump cylinder has a transverse partition and a piston assembly including an elongated piston rod extending through the partition and connected at its opposite ends to spaced apart pistons. The pump pistons and the cylinder partition divide the cylinder into a production fluid intake chamber, a production fluid transfer and delivery chamber, a driving fluid chamber and a second production fluid delivery chamber. Production fluid is conducted to the surface through a production fluid conduit disposed coaxial within the driving fluid conduit. A power transfer apparatus includes opposed cylinders and an opposed piston assembly interconnected by a common piston rod forming opposed production fluid and driving fluid chambers wherein the fluids are oscillated by the power transfer apparatus in the respective conduits and a net delivery of production fluid is conducted to a production fluid delivery line. Opposed hydraulic fluid chambers in the power transfer apparatus are connected to a reversible hydraulic pump. Pump driving fluid may be biased by an accumulator formed in the driving fluid conduit or in an accumulator cylinder connected to the pump in a modified version of the system which eliminates the driving fluid conduit. Embodiments of the pump system include mechanical rod actuated pumps which are operated on a lifting stroke by the column of production fluid.
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