Wells – Screens – Porous material
Patent
1990-01-25
1991-04-02
Novosad, Stephen J.
Wells
Screens
Porous material
166230, 166233, E21B 4308
Patent
active
050040499
ABSTRACT:
A prepack sand screen assembly has resistance welded inner and outer screens concentrically mounted in radially spaced relation onto a perforated mandrel, thereby defining an annulus in which prepack gravel is loaded. The longitudinal spacing distance between adjacent turns of the inner and outer screens selectively exclude sand fines of a predetermined minimum size. The outer screen wire is substantially greater in size as compared to the corresponding dimension of the inner retention screen wire. The inner retention screen is radially spaced with respect to the perforated mandrel, thereby defining a bypass flow annulus. The effective inlet flow area through the inner retention screen is more than twice the effective inlet flow area through the outer screen. Accordingly, localized deposits of sand fines on the inner screen are effectively bypassed by the remaining flow passages formed across the inner retention screen. According to this arrangement, the dual screen prepack assembly 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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Griggs Dennis T.
Novosad Stephen J.
Otis Engineering Corporation
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