Slip on screen with expanded base pipe

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 39/00 (2006.01) B21D 31/04 (2006.01) B21F 27/18 (2006.01) E21B 43/08 (2006.01) B23K 11/08 (2006.01)

Patent

CA 2526024

The present invention provides a method for manufacturing a wellscreen and a wellscreen that have the mechanical properties of a direct-wrap wellscreen and the precise slot tolerance of a slip-on wellscreen. In one embodiment, a method for manufacturing a wellscreen for use in a wellbore is provided. The method includes disposing a filter subassembly on a base pipe sized so that there is annulus between the base pipe and the filter subassembly. The filter subassembly includes a length of wire wrapped and welded along a plurality of rods so that a slot is defined between adjacent coils of wire. The method further includes expanding the base pipe so that the slot is not substantially altered, thereby substantially reducing or eliminating the annulus.

La présente invention concerne un procédé de fabrication d'un filtre pour puits ainsi qu'un filtre pour puits qui possède les propriétés mécaniques d'un tamis à plaquage direct et la tolérance d'entaille précise d'un filtre pour puits à emboîtement. Dans un mode de réalisation, on prévoit un procédé de fabrication d'un filtre pour puits de forage. Le procédé comprend le montage d'un ensemble de filtre sur un tuyau de base taillé de sorte qu'il y ait un espace annulaire entre le tuyau de base et le sous-assemblage de filtre. Le sous-assemblage de filtre comprend une longueur de câble enveloppé et soudé à plusieurs tiges de manière à définir un espace entre les couronnes de fil adjacentes. Le procédé comprend également l'expansion du tuyau de base pour que l'entaille ne soit pas sensiblement modifiée, ce qui réduit considérablement, voire élimine, l'espace annulaire.

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