Downhole well cleaning tool

Details Downhole well cleaning tool Downhole well cleaning tool

2011-02-22

2011-02-22

Dang, Hoang (Department: 3672)

Wells

With eduction pump or plunger

Having sediment trap or deflector

C166S311000

Reexamination Certificate

active

07891419

ABSTRACT:
A downhole well cleaning tool adapted for connection between upper and lower sections of an elongate string includes a pump barrel having at least one fluid outlet proximate its upper end. A swab assembly is connected to a pump mandrel for reciprocation within the pump barrel to pump fluids upward to the outlet to draw fluid and debris into the lower string section and trap the debris. A lower portion of the swab mandrel is hollow and open at a lower end thereof with at least one conduit extending through a side wall of the swab mandrel to direct fluid laterally outward from the hollow lower portion against the side wall of the pump barrel during lowering into fluid to reduce debris build-up within the pump barrel. A wear bushing is mounted between the pump mandrel and barrel and a knuckle or swivel joint connects the swab and pump mandrels.

REFERENCES:
patent: 974342 (1910-11-01), Bell
patent: 4940092 (1990-07-01), Ferguson
patent: 5095976 (1992-03-01), Appleton
patent: 5119874 (1992-06-01), Ferguson et al.

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