Double walled screen-filter with perforated joints

Details Double walled screen-filter with perforated joints Double walled screen-filter with perforated joints

1984-11-15

1986-04-22

Novosad, Stephen J.

Wells

Screens

Porous material

166236, 166 51, 175314, E21B 4308

Patent

active

045835942

ABSTRACT:
A well screen-filter includes a pair of substantially spaced concentric screens defining an annular filtrating space therebetween, connected with perforated joint(s) closing the lower end of the filtrating space. The annular space is filled with filtrating materials (gravel or synthetic balls) as a pack and an upper joint acts as a cover cap of the annular filtrating space to seal the pack. The lower perforated joint includes holes for passage of fine particles to a sedimentation tube, preventing clogging of the pack and enabling proper functioning of the double walled screen-filter.

REFERENCES:
patent: 1004528 (1911-09-01), Berky
patent: 1839044 (1931-12-01), Minyard
patent: 1874035 (1932-08-01), Fletcher
patent: 2207184 (1940-07-01), White
patent: 2257344 (1941-09-01), Maloney
patent: 2525897 (1950-10-01), Greene
patent: 2665644 (1954-01-01), Wells
patent: 2978033 (1961-04-01), Pitcher et al.
patent: 3312349 (1967-04-01), Rosaen
patent: 3618771 (1971-11-01), Akers et al.
patent: 3965981 (1976-06-01), D'Amiano
patent: 4526230 (1985-07-01), Kojicic

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