Apparatus for maintaining uniform pressure within an...

E - Fixed Constructions – 21 – B

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E21B 33/127 (2006.01)

Patent

CA 2367526

A thermal compensating apparatus method for maintaining a substantially constant fluid pressure within a subterranean well tool of the type that includes a bladder (25) that is selectively expandable upon the introduction of pressurized actuation fluid for actuating said tool at a location in a well. A body includes first and second fluid chambers (49, 21). The first fluid (49) chamber houses a substantially incompressible fluid and communicates with the actuating fluid used for activating said tool in the well. The second fluid chamber is charged with a compressible fluid. Both chambers (21) define first volumetric sizes within the body upon actuation of said tool in the well. The fluid chambers are operatively connected to each other without transmitting fluid there between so that changes in the volumetric size of the first chamber caused by temperature variations in the actuation fluid will change the volumetric size of the second fluid chamber for maintaining the actuating fluid at a substantially constant pressure.

L'invention concerne un procédé et un appareil de compensation thermique permettant de maintenir une pression de fluide sensiblement constante à l'intérieur d'un outil de forage souterrain, de ceux qui comprennent une vessie (25) sélectivement expansible lors de l'introduction d'un fluide d'activation sous pression destiné à activer ledit outil à un emplacement à l'intérieur d'un puits. Un corps comporte une première et une seconde chambre (49, 21) à fluide. La première chambre (49) à fluide habrite un fluide sensiblement incompressible et est en communication avec ledit fluide d'activation. La seconde chambre à fluide est chargée d'un fluide compressible. Les deux chambres (21) définissent des premières dimensions volumétriques à l'intérieur du corps lors de l'activation dudit outil dans le puits. Ces chambres sont reliées entre elles de façon fonctionnelle sans transmission de fluide, de façon que les changements de volume de la première chambre, provoqués par des variations thermiques dans le fluide d'activation, modifiera le volume de la seconde chambre à fluide afin de maintenir le fluide d'activation à une pression sensiblement constante.

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