Pumps – Expansible chamber type – Valved piston
Patent
1984-11-19
1987-04-28
Freeh, William L.
Pumps
Expansible chamber type
Valved piston
166105, 1661051, F04B 2104, F04B 3910, E21B 4300
Patent
active
046610529
ABSTRACT:
A positive-displacement single-acting down-hole reciprocating pump for excavating and conveying to the surface accumulations of sand and other detritus that collects at the bottom of producing oil, gas, geothermal, and water-supply wells. The down-hole sand pump is activated by the axial oscillation of a steel cylindrical weighted momentum unit, which, in turn, is axially oscillated by a string of light-weight composite pipe, which in turn is axially oscillated at the surface. The sand and other detritus, along with the circulation fluid, is drawn into suction ports in the down-hole sand pump, and is conveyed upward through the pump, through the weighted momentum unit, and through the light-weight string of composite pipe to the surface. The down-hole sand pump is equipped with an extrusion-resistant self-lubricating pressure-activated spring-loaded self-activated and self-adjusting seal and wiper system that is pressure-activated on the compression strokes, and self-actuates during suction strokes, while it automatically self-adjusts to compensate for wear at the V-ring lips, and is designed in such a manner that prevents extrusion of the V-rings in high temperature and high-pressure applications.
REFERENCES:
patent: 278575 (1857-03-01), Reynolds
patent: 2039621 (1936-05-01), Behnke
patent: 2325503 (1943-07-01), Goble
patent: 2646128 (1953-07-01), Reynolds
patent: 3138215 (1964-06-01), Cook
patent: 3592567 (1971-07-01), Tolbert
patent: 4190113 (1978-07-01), Harrison
patent: 4421182 (1983-12-01), Moody
patent: 4478285 (1984-10-01), Caldwell
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