Inflatable packer

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/127 (2006.01)

Patent

CA 2368902

An inflatable packing device for use in a subterranean well provides a sophisticated cover means which results in a uniform expansion profile and exceptionally low angles of expansion propagation during inflation of the bladder to set the device, whereby well fluids between the wall of the well bore and the exterior of the cover of the device are swept away from the area of subsequent sealing of the cover. The propensity for rib kinking and rib cutting, pinching, folding, cracking and tearing of the bladder during inflation are eliminated. Correspondingly, reduced stresses and strains in cover segments combined with near ideal inflation profiles result in enhanced expansion propagation of the inflation element and improved service performance and reliability of the downhole device.

L'invention concerne un dispositif d'étanchéité convenant pour des puits souterrains. Ce dispositif comprend une enveloppe élaborée qui permet d'obtenir un profil de dilatation uniforme et des angles de propagation de la dilatation exceptionnellement faibles pendant le gonflage de la vessie servant à la mise en place du dispositif, les fluides présents entre la paroi du puits et l'extérieur de l'enveloppe du dispositif étant chassés de la zone dans laquelle la couverture doit réaliser une fermeture étanche. Les risques d'enroulement et d'entaille du support et d'étranglement, de pliage, de rupture et de déchirure de la vessie pendant le gonflage sont éliminés. Ainsi, grâce à une réduction des contraintes et des déformations des segments de l'enveloppe, associée à des profils de gonflage proches de l'idéal, la propagation de la dilatation de l'élément de gonflage est améliorée, ce qui confère à ce dispositif fond-de-trou une performance et une fiabilité accrues pendant l'utilisation.

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