Wells – Screen with washing point or shoe
Patent
1986-06-30
1987-10-20
Novosad, Stephen J.
Wells
Screen with washing point or shoe
175 21, E21B 726
Patent
active
047007761
ABSTRACT:
A well screen filter is formed with inner and outer concentric screens defining an annular filtering space filled with filtrating medium. A lower perforated plate supporting the filtrating materials has passages allowing transit of fine particles entrained into the filter with formation fluid to a sedimentation tube preventing clogging of the filtering pack. A top perforated plate may be provided to prevent clogging of upper pack areas. Openings in the outer screen extend elevationally higher than corresponding openings in the inner screen so that as the filtrating materials compact during production the inner screen openings always remain covered by the pack. A method of installing the sand control filter is also disclosed, utilizing a wash down media of glass or polymer spheres surrounding the filter to assist in stabilization of formation sand when the well is initially placed in production. A jet shoe connected to the sand filter is also disclosed for directing working fluid in upward and downward directions to displace the wash down media into position surrounding the filter.
REFERENCES:
patent: 2126576 (1938-08-01), Ranney
patent: 2838120 (1958-06-01), Allmendinger et al.
patent: 3145778 (1961-11-01), Grekel et al.
patent: 3151687 (1964-10-01), Suto et al.
patent: 3887021 (1975-06-01), Elbert
patent: 4391328 (1983-07-01), Aumann
Neuder William P.
Novosad Stephen J.
Well Improvement Specialists, Inc.
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