Hydraulic metering valve for operation of downhole tools

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/10 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2655577

Methods and systems for operating a sliding sleeve valve or other downhole well tool (14) that is axially shiftable among a finite number of increments between two extreme configurations such as open and closed configurations. A metering device is described having a pair of piston metering assemblies (36, 38) that operate in parallel fluid flow paths. The first piston metering assembly (36) moves the sleeve of the well tool from a fully closed position to the zero position. The second piston metering assembly can be repeatedly pressurized and depressurized to meter predetermined amounts of fluid from an actuator sequentially to move the sleeve of the sleeve valve in consecutive increments toward a fully open position.

L'invention concerne des procédés et des systèmes d'actionnement d'une vanne à manchon coulissant ou d'un autre outil de fond de puits susceptible d'être déplacé axialement parmi un nombre fini d'incréments entre deux configurations extrêmes telles que des configurations ouverte et fermée. Un dispositif de dosage décrit est doté d'une paire d'ensembles de dosage à piston fonctionnant sur des trajets parallèles d'écoulement de fluide. Le premier ensemble de dosage à piston déplace le manchon de l'outil de puits d'une position entièrement fermée à la position zéro. Le deuxième ensemble de dosage à piston peut être mis sous pression et hors pression de façon répétée afin de doser des quantités prédéterminées de fluide à partir d'un actionneur, afin de déplacer séquentiellement le manchon de la vanne à manchon par incréments consécutifs vers une position entièrement ouverte.

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