| 摘要 |
A downhole pump filter filters sand and other solid particles from well fluids prior to passage of the fluids through the intake nut of a well pump. A cylindrical coupling has an externally threaded upper end which coaxially screws into the pump intake nut. The coupling also has an externally threaded lower end. A tubular member coaxially secured within the lower end of the coupling has a plurality of perforations dispersed at least along its lower portion. A filter sock may encase the perforated portion of the tubular member to block smaller sand or other solid particles from entry into the tubular member perforations. A cylindrical casing with a closed lower end and an internally threaded upper end coaxially screws onto the exxternally threaded lower end of the coupling with the tubular member and the filter sock disposed within the casing. The casing has a plurality of perforations dispersed at least along its lower poriton. The casing perforations, the filter sock, if any, the tubular member perforations and the cylindrical coupling sequentially communicate to form a flow path for well fluid into the pump intake nut.
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