Piston and valve assembly

Details Piston and valve assembly Piston and valve assembly

1984-09-07

1985-10-01

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

91224, 91321, 417403, 417407, F04B 4708

Patent

active

045443351

ABSTRACT:
A downhole hydraulically actuated pump assembly of either the free or fixed type lifts formation fluid from the bottom of a borehole to the surface of the ground. The downhole pump has a power piston which actuates a production plunger. A valve means is concentrically arranged within the power piston. A stationary, hollow valve control rod extends through the power piston and through the valve means, with a lower marginal end of the control rod terminating within the production plunger. Power fluid flows through the control rod and to the valve means. As the power piston reciprocates within the engine cylinder, means on the control rod actuates the valve means between two alternant positions so that power fluid is applied to the bottom face of the power piston to thereby cause the power piston to reciprocate upward; and thereafter, the control rod causes the valve means to shift to the other position, whereupon spent power fluid is exhausted from the engine cylinder. The spent power fluid is admixed with production fluid and is conducted to the surface of the ground.

REFERENCES:
patent: 2497348 (1950-02-01), Ecker
patent: 3865516 (1975-02-01), Roeder
patent: 4026661 (1977-05-01), Roeder
patent: 4118154 (1978-10-01), Roeder

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