Well screen assembly

E - Fixed Constructions – 21 – B

Patent

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Details

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

Patent

CA 2466582

A method and apparatus for assembling a wellscreen (50) onto a perforated base pipe (52) are provided. The wellscreen defines a tubular body which is suitable for subterranean use in oil, gas, and water wells. In accordance with the present invention, the wellscreen first defines a perforated base pipe having termination members (66) at its opposite ends. Disposed on each termination member is a continuous helical, step-tiered surface (72). The helical surface serves as a support surface for a layer of filtering material (74) which is rolled around the base pipe. The filtering material is pre-cut to a correct diameter and bias to match the diameters and bias of the spiralling termination support surfaces. The filtering material is connected to the rings to form a substantial seal on the opposite ends. A protective, perforated outer shroud is optionally disposed around the filtering media as well. The filtering material has at least two sections of different filter type.

La présente invention concerne un procédé et un appareil permettant d'assembler un filtre de puits (50) sur un tuyau (52) de base perforé. Ce filtre de puits définit un corps tubulaire qui convient pour une utilisation souterraine dans des puits de pétrole, de gaz ou d'eau. Selon cette invention, le filtre de puits définit d'abord un tuyau de base perforé possédant des terminaisons (66) au niveau de ses extrémités opposées. Une surface (72) à pas progressif, hélicoïdale et continue est située sur chaque terminaison. Cette surface hélicoïdale sert de surface de support pour une couche de matériau filtrant (74) qui est roulée autour du tuyau de base. Ce matériau filtrant est prédécoupé au bon diamètre et en biais de façon à s'adapter aux diamètres et au biais des surfaces de support des terminaisons en spirale. Ce matériau filtrant est connecté aux bagues de façon à former un joint sensible au niveau des extrémités opposées. Un recouvrement de protection extérieur, perforé, est éventuellement placé autour du support filtrant. Le matériau filtrant possède au moins deux parties d'un type de filtre différent.

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