Sintered metal substitute for prepack screen aggregate

Details Sintered metal substitute for prepack screen aggregate Sintered metal substitute for prepack screen aggregate

1991-12-16

1993-03-02

Novosad, Stephen J.

Wells

Screens

Porous material

291638, 29902, 21050025, 2105101, 21049701, 419 5, 419 28, 419 39, B01D 3910, E21B 4308

Patent

active

051901021

ABSTRACT:
A prepack well screen assembly has a resistance welded outer screen concentrically mounted in radially spaced relation on a perforated mandrel, thereby defining an annulus in which a sintered metal prepack sleeve is loaded. The longitudinal spacing distance between adjacent turns of the outer screen selectively exclude sand fines of a predetermined minimum size. The porosity of the sintered metal prepack sleeve is selected to pass sand fines in the size range of from about 20 microns to about 150 microns. The effective inlet flow area through the sintered metal prepack sleeve is substantially greater than the effective inlet flow area through the outer screen. The sintered metal prepack screen excludes sand fines from inflowing formation fluid during the initial production phase following a gravel pack operation, without limiting production of formation fluid.

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