PC pump inlet backwash method and apparatus

Details PC pump inlet backwash method and apparatus PC pump inlet backwash method and apparatus

2005-06-21

2005-06-21

Thompson, Kenn (Department: 3672)

Wells

With below and above ground modification

Eduction pump or plunger in well

C166S105000, C418S048000

Reexamination Certificate

active

06907925

ABSTRACT:
A downhole moineau pump assembly includes a stator with a rotor extending through the stator. The rotor and stator sealingly engage each other at spaced intervals to form a series of annular spaces. A primary inlet is provided for fluids to enter a first of the series of annular spaces. A surface mounted top drive unit rotates the rotor. As the rotor rotates, fluids are drawn through the primary inlet and up the series of annular spaces between the rotor and the stator. A portion of the rotor is hollow with a central flow passage extending from a secondary inlet spaced from the primary inlet to the primary inlet. A portion of the fluids being pumped to surface are diverted into the secondary inlet and pumped under pressure down the central flow passage of the rotor to the primary inlet, thereby washing accumulated solids form the primary inlet.

REFERENCES:
patent: 3443482 (1969-05-01), Lummus et al.
patent: 4397619 (1983-08-01), Alliquander et al.
patent: 4614232 (1986-09-01), Jurgens et al.
patent: 4923376 (1990-05-01), Wright
patent: 5090497 (1992-02-01), Beimgraben et al.
patent: 5799733 (1998-09-01), Ringgenberg et al.

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