Multi-stage pressure maintenance device for subterranean...

E - Fixed Constructions – 21 – B

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E21B 33/127 (2006.01)

Patent

CA 2367496

A thermal compensating apparatus (52) and method for maintaining a substantially constant fluid pressure within a subterranean well tool of the type that includes a bladder that is selectively expandable upon the introduction of pressurized actuation fluid for actuating said tool at a location in a well. A multi-stage piston (80, 84, 86) is movable in a housing. The piston includes a first surface (80') in contact with the actuating fluid and a plurality of second surfaces (80", 84", 86") in contact with well fluid surrounding the apparatus. The combined surface areas of the second surfaces are greater than the surface area of the first surface, so that expansion or contraction changes in the volume of the actuating fluid caused by temperature changes in the vicinity of the tool will result in movement of the piston for maintaining the actuating fluid at a relatively constant pressure.

L'invention concerne un procédé et un appareil (52) de compensation thermique, permettant de maintenir une pression fluidique sensiblement constante dans un outil de puits souterrain du type vessie, qui se déploie de manière sélective lors de l'introduction d'un fluide d'actionnement sous pression, destiné à actionner ledit outil au niveau d'un emplacement du puits. Un piston multi-étage se déplace dans un logement. Ce piston (80, 84, 86) comprend une première surface (80) en contact avec le fluide d'actionnement, et une pluralité de secondes surfaces ( 80'', 84'', 86'') en contact avec le fluide du puits entourant l'appareil. Les zones combinées des secondes surfaces sont plus grandes que la zone de la première surface, de sorte que les changement dans l'expansion ou dans la contraction du volume du fluide d'actionnement provoqués par les changements de température à proximité de l'outil, provoquent le déplacement piston afin de maintenir ledit fluide d'actionnement à une pression relativement constante.

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