Control system with collection chamber

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/10 (2006.01)

Patent

CA 2194105

A control system for the operation of the subsurface safety valve is dis- closed. The control system uses a pressurized gas chamber, as well as a shuttle valve which connects to the main fluid pressure supply from the surface. The shuttle valve is connected to the gaseous chamber as well as to a barrier piston. As a result of the arrangement, leakages between the downstream side of the operating piston and the shuttle valve result in a reestablishment of the pressure balance on the operating system which allows the subsurface safety valve to close. Additionally, in the event of loss of gaseous pressure, the same pressure-balancing effect occurs on the operating piston, which allows the subsurface safety valve to go to a closed position. The configuration of the control system, which includesa gaseous chamber, allows for disconnection of the hydraulic fluid supply beforethe predetermined depth is reached to facilitate the connection of a tubing hanger.

Le présent résumé décrit le système de commande d'une soupape de sûreté souterraine. Le système de commande utilise un réservoir de gaz sous pression, de même qu'un sélecteur de circuit qui est raccordé à l'alimentation sous pression du fluide principal en surface.Le sélecteur de circuit est raccordé au réservoir de gaz ainsi qu'à un piston barrière. Cet agencement fait que les fuites entre le côté aval du piston de manoeuvre et le sélecteur de circuit entraînent le rétablissement de l'équilibre de la pression sur le système d'exploitation, ce qui permet à la soupape de sûreté souterraine de se fermer. De plus, en cas de perte de pression de gaz, le même effet d'équilibre de la pression se produit sur le piston de manoeuvre, ce qui premet à la soupape de sûreté souterraine de se mettre en position de fermeture. La configuration du système de commande, qui comporte un réservoir de gaz, permet de couper l'alimentation en fluide hydraulique avant que soit atteinte la profondeur prédéterminée pour faciliter la pose d'un équipement de suspension de tubes.

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