Backflush filter system for downhole pumps

Details Backflush filter system for downhole pumps Backflush filter system for downhole pumps

1993-07-30

1995-05-09

Drodge, Joseph W.

Sheet-material associating

Associating or disassociating

Signature associating

210108, 210170, 210411, 2104165, 210791, B01D 2966

Patent

active

054137217

ABSTRACT:
A filter assembly for filtering particulate matter from well fluids to be pumped by a downhole pump in an oil well including a filter and apparatus to reverse the flow through the filter in response to a pre-selected level of differential pressure across the filter, the apparatus including a check valve which opens to allow fluid to flow through to operate a piston to open a pump valve and allow fluid flow out of the pump.

REFERENCES:
patent: 2046770 (1936-07-01), Coberly
patent: 2049304 (1936-07-01), Lloyd
patent: 2646126 (1953-07-01), Goodner
patent: 3973630 (1976-08-01), Wheeler et al.
patent: 4273192 (1981-06-01), Saadeh et al.
patent: 4478285 (1984-10-01), Caldwell
patent: 4621693 (1986-11-01), Caldwell et al.
patent: 4778355 (1988-10-01), Holland
patent: 4940092 (1990-07-01), Ferguson et al.
patent: 4969518 (1990-11-01), Schmitt et al.
patent: 5042149 (1991-08-01), Holland
Spears Specialty Oil tools, Inc.; Backwash Valve; (4 pg.), undated.

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