Particle control screen assembly

Details Particle control screen assembly Particle control screen assembly

E - Fixed Constructions

21

B

E21B 43/08 (2006.01) B01D 29/11 (2006.01)

Patent

CA 2262673

A particle control screen assembly for a perforated pipe (22) used in a well, a sand filter system, and methods of making same are provided. The screen assembly (21) includes a woven mesh filter media (27) disposed about the perforated pipe (22), and a protective wrapper (28) disposed about the filter media (27). The protective wrapper (28) comprises an outer perforated layer (30) and an inner layer (29, 43) that is disposed between the outer layer (30) and the filter media (27). A surface (36) of the inner layer (29, 43) that faces the outer perforated layer (30) has a non-smooth contour (38), with this surface (36) of the inner layer (29, 43) having portions in direct contact with an inner surface of the outer layer (30). The inner layer (29, 43) is provided with apertures that are disposed in such a way that fluid cannot flow from the outer surface of the outer perforated layer (30) directly radially both through holes (35) of the outer layer and through the apertures of the inner layer (29, 43).

Ansemble tamis de régulation de particules pour un tuyau perforé (22) utilisé dans un puits, système de filtre à gravier et leurs procédés de fabrication. L'ensemble tamis (21) comprend un milieu filtrant à tamis tissé (27) disposé autour du tuyau perforé (22), ainsi qu'une enveloppe protectrice (28) disposée autour du milieu filtrant (27). L'enveloppe protectrice (28) comprend une couche externe perforée (30) et une couche interne (29, 43) disposée entre la couche externe (30) et le milieu filtrant (27). Une surface (36) de la couche interne (29, 43) orientée vers la couche externe perforée (30) présente un contour irrégulier (38), et comporte des parties venant en contact direct avec une surface intérieure de la couche externe (30). La couche interne (29, 43) est pourvue d'ouvertures disposées de telle façon qu'un fluide ne puisse s'écouler directement, dans le sens radial, de la surface externe de la couche externe perforée (30) à travers les deux trous traversants (35) de la couche externe et à travers les ouvertures de la couche interne (29, 43).

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