Method and apparatus to reduce downhole surge pressure using...

E - Fixed Constructions – 21 – B

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E21B 21/08 (2006.01) E21B 17/00 (2006.01) E21B 21/10 (2006.01) E21B 34/06 (2006.01) E21B 34/10 (2006.01) E21B 34/14 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2487012

An apparatus (100) for reducing pressure surges in a wellbore comprising a body having a bore (124) therethrough, the bore providing a fluid path for wellbore fluid between a first and second end of the body, at least one fluid path (122) permitting the wellbore fluid to pass between the bore and an annular area formed between an outer surface of the body and the walls of a wellbore therearound, and a number of closure mechanisms (110) whereby the at least one fluid path is selectively closable to the flow of fluid.

L'invention concerne un appareil (10) servant à réduire les augmentations subites de pression dans un puits de forage. Cet appareil comprend : un corps traversé par un orifice (124) qui constitue un chemin pour le liquide du puits de forage entre une première et une deuxième extrémité dudit corps ; au moins un chemin (122) qui permet au liquide du puits de forage de passer entre cet orifice et une zone annulaire ménagée entre une surface extérieure du corps et les parois d'un puits de forage qui entourent ce corps ; ainsi qu'un nombre de mécanismes de fermeture (110). Ce/ces chemin(s) peut/peuvent être fermé(s) sélectivement pour empêcher l'écoulement de fluide.

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