Pumps – Motor driven – Fluid motor
Patent
1995-12-21
1997-07-29
Freay, Charles G.
Pumps
Motor driven
Fluid motor
417403, 417528, 4175552, 60377, 91318, 91337, 277 58, 277165, F04B 914, F04B 1700
Patent
active
056516665
ABSTRACT:
This invention features a small-enveloped (with an outside diameter of at least approximately 38 mm), single-acting, hydraulically-operated, reciprocating, deep-well, fluid-extraction pump, operable in non-straight and angular wells, and its mode of operation. The hydraulically-operated, deep-well pump, in addition to having an above-ground installation of its motor-fluid generator and of its control valving, comprises a compound, stepped piston that is reciprocably mounted within a cylinder which in turn is divided into individual pressure chambers. Hydrostatic pressure created by a hydraulic pump is selectively directed to two outlet ports to produce an overpressure in one of the outlet ports at any given instant. The overpressure in each outlet port leads to creation of overpressure in one or more pressure chambers. Imbalances in pressure among the pressure chambers result in movement of the compound, stepped piston and extraction of hydraulic-well fluid by the compound, stepped piston. Reversals in flow pattern of the pressurized hydraulic-well fluid are realized by changing alignments of the outlet ports from parallel-flow porting to crossed-flow porting and vice versa. Individually adjustable pumping-cycle and suction-cycle time and independently adjustable up- and down-stroke velocity, as well as independently adjustable time delay for well recovery, may be allowed. An improved self-cleaning suction filter is used in screening any hydraulic-well fluid and an anti-gaslocking design is presented. Function of dynamic, preferably metallic, self-adjusting, fluid seals, used in the hydraulically-operated, deep-well pump is based upon a dynamic, pressure drop of turbulent axial flow through a plurality of closely-controlled, radial clearances and a plurality of closely-fitting seal rings.
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Bani-Jamali Maryam
Freay Charles G.
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