Variable downhole choke

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/06 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2377890

A variable downhole choke is disclosed wherein an outer housing includes a selected port pattern of ports (12) and subports (14) and a sleeve having similar ports and subports wherein subports depend from ports on each of the housing and sleeve. The ports/subports are oriented so that upon converging movement of housing and sleeve the sleeve subports align with housing subports before the sleeve ports align with housing ports.

L'invention concerne une duse variable de fond, dans laquelle un logement externe comprend un modèle sélectionné d'orifices (12) et de sous-orifices (14) et une enveloppe pourvue d'orifices et de sous-orifices similaires, lesdits sous-orifices dépendant des orifices situés sur le logement et l'enveloppe. Les orifices et sous-orifices sont orientés, de telle manière que suite à un mouvement convergeant du logement et de l'enveloppe, les sous-orifices du manche s'alignent aux sous-orifices du logement, avant que les orifices de l'enveloppe ne s'alignent aux orifices du logement.

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