Wire mesh filter

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 39/12 (2006.01) B01D 46/24 (2006.01) E21B 43/08 (2006.01)

Patent

CA 2216973

A filter is provided which combines a woven wire mesh (14) over a supporting body. The supporting body is typically a metal perforated tube which provides fluid communication between the well bore and the production equipment string. The woven wire mesh (14) acts as a filter to prevent the influx of sand particles (30), provides openings oriented at various angles relative to its surface, so that some area is available for fluid entry even when particulate matter is lodged on the surface above an opening, provides interior channels that allow fluid to travel from one location on the mesh surface to another location over an opening into the supporting body, and does not provide "straight-through" openings, thus forcing the fluid to make multiple turns (28) to pass through the mesh, thereby dissipating the fluid's energy and increases the mesh's erosion resistance. When particulate matter accumulates on the mesh's surface, the resulting particle cake remains porous, heightening the filter's resistance to plugging.

Filtre comportant un treillis de fil métallique tissé (14) sur un corps formant support. Ce corps est généralement un tube de métal perforé qui permet le passage de fluide entre le puits et l'équipement de production. Le treillis de fil métallique tissé (14) sert de filtre en évitant l'entrée de particules de sable (30). Ses ouvertures sont orientées suivant différents angles par rapport à sa surface, ce qui fait qu'une certaine surface permet l'entrée de fluide même lorsque de la matière particulaire s'est fixée sur la surface au-dessus d'une ouverture. Des canaux intérieurs permettent au fluide de circuler d'un site de la surface du treillis à un autre site situé au-dessus d'une ouverture de la surface du corps. Le filtre ne comporte pas d'ouvertures à trajet direct, ce qui oblige le fluide à faire des détours multiples (28) pour traverser le treillis. On arrive ainsi à dissiper l'énergie du fluide et à augmenter la résistance à l'usure du treillis. Lorsque de la matière particulaire s'accumule à la surface du treillis, l'agglomérat de particules qui en résulte reste poreux, ce qui augmente la résistance du filtre à l'obstruction.

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