Control line hydrostatic minimally sensitive control system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/10 (2006.01)

Patent

CA 2670135

A control system for a downhole tool, such as a subsurface safety valve, features an operating piston that is insensitive to tubing pressure in the valve. The hydrostatic forces from the single control line from the surface are significantly reduced with a branch line to a piston bottom that is slightly smaller than the piston top. A variable volume between piston seals is connected to a low pressure compressible fluid reservoir to permit piston movement. The piston can be modular to facilitate assembly or bore offsets in the valve body. Failsafe closure upon seal failures is contemplated.

Un système de commande d'un outil de fond de trou, tel qu'une vanne de sécurité de subsurface, comprend un piston moteur qui est insensible à la pression des tiges de production dans la vanne. Les forces hydrostatiques provenant de la ligne de commande unique de la surface sont considérablement réduites avec une ligne en dérivation vers un fond de piston de taille légèrement inférieure à la tête de piston. Un volume variable entre les joints de piston est relié à un réservoir de fluide compressible à faible pression pour permettre le mouvement du piston. Le piston peut être modulaire pour faciliter les décalages d'assemblage ou de forage[1] dans le corps de vanne. Une fermeture de sécurité en cas de défaillance du joint est envisagée. [1] N.D.T. : sous réserve, <= bore >= peut également signifier <= alésage >=.

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