Sintered metal substitute for prepack screen aggregate

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

1993-02-23

1994-03-15

Novosad, Stephen J.

Wells

Screens

Porous material

166231, 166233, 166234, 2105101, 21049701, E21B 4308, B01D 3910

Patent

active

052939359

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 10 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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