Run in cover for downhole expandable screen

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 43/08 (2006.01)

Patent

CA 2496522

A screen to be expanded when placed downhole is disclosed. The screen is delivered to the location with a cover that blocks access to the screen from well fluids. Circulation or reverse circulation can be undertaken with no appreciable flow through the screen due to placement of the cover. In one embodiment the cover has slits (16) that open to be diamond shapes (18) upon expansion of the underlying screen. In another embodiment, the openings are created by shapesthat have a weakened edge that, as a result of expansion break off to create available openings for flow.

La présente invention a trait à une crépine destinée à se dilater lors de sa mise en place en fond de puits. La crépine est délivrée à l'emplacement avec un couvercle qui interdit la pénétration de la crépine par des fluides de puits. La circulation ou la circulation inverse peut s'effectuer sans écoulement perceptible à travers la crépine grâce au placement du couvercle. Dans un mode de réalisation, le couvercle présente des fentes (16) qui s'ouvrent de manière biconique (18) lors de la dilatation de la crépine sous-jacente. Dans un autre mode de réalisation, les ouvertures sont crées par des formes présentant des bords fragilisés qui, grâce à l'expansion se rompent pour créer des ouvertures aptes à un écoulement.

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