Linear motor to pre-bias shuttle force

E - Fixed Constructions – 21 – B

Patent

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E21B 34/06 (2006.01)

Patent

CA 2673009

A method of controlling one or more operating pressures within a subterranean borehole that includes a choke assembly comprising a housing having an inlet passage, an axial bore, and a chamber, wherein a portion of the axial bore forms an outlet passage, and a choke member adapted for movement in the housing to control the flow of a fluid from the inlet passage to the outlet passage. The method may include applying a closing force to move the choke member toward a closed position, and applying a bias force to the choke member when in the closed position to reduce an overpressure required to initiate movement of the choke member from the closed position.

L'invention concerne un procédé permettant de réguler au moins une pression de service dans un puits de forage souterrain comprenant un ensemble duse constitué d'un logement pourvu d'un passage d'entrée, d'un alésage axial et d'une chambre, une partie de l'alésage axial formant un passage de sortie, et un élément duse conçu pour se déplacer dans le logement de sorte à réguler l'écoulement d'un fluide entre le passage d'entrée et le passage de sortie. Le procédé selon l'invention peut consister à appliquer une force de fermeture pour déplacer l'élément duse dans une position fermée ; et à appliquer une force de polarisation sur l'élément duse lorsqu'il se trouve en position fermée, de sorte à réduire la surpression nécessaire pour initier le mouvement de l'élément duse à partir de la position fermée.

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