Multi-position sliding sleeve valve

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/06 (2006.01) E21B 34/10 (2006.01)

Patent

CA 2480077

A downhole choke in the form of a sliding sleeve valve operable in a plurality of positions including fully open, fully closed, and positions in between, is disclosed. It features a hydraulic control system that, in one embodiment, provides the motive force to move the sliding sleeve (34) a predetermined amount for a given applied control pressure. Further increments in applied pressure result in further predetermined movements of the sliding sleeve. In another embodiment, the sliding sleeve (34) lands in a series of grooves (86- 98) in the surrounding housing depending on the degree of pressure applied to the control system.

L'invention concerne une duse de puits sous la forme d'une soupape à manchon de type coulissant fonctionnant selon plusieurs positions, comprenant une position d'ouverture totale, une position de fermeture totale et des positions intermédiaires. L'invention concerne aussi un système de commande hydraulique qui, dans un mode de réalisation, fournit la force motrice nécessaire au déplacement de la soupape à manchon (34) d'une quantité déterminée pour une pression de commande donnée appliquée. Des augmentations supplémentaires de pression produisent d'autres déplacements de la soupape à manchon. Dans un autre mode de réalisation, le manchon coulissant (34) passe dans une série d'encoches (86-98) pratiquées dans le logement entourant en fonction du degré de pression appliquée au système de commande.

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