| 摘要 |
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.
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