Inflatable packer with prestressed bladder

Details Inflatable packer with prestressed bladder Inflatable packer with prestressed bladder

E - Fixed Constructions

21

B

E21B 33/127 (2006.01)

Patent

CA 2425329

An improved inflatable packer 10 is provided having a pre-stretched bladder to minimize Z-folding. An expandable outer body 11 includes an inner elastomeric bladder layer 12, a reinforcement layer 14 which may include overlapping slats or cable, and an outer elastomer cover layer 16 which may cover only a portion of the reinforcement layer 14. The bladder 12 may expand non-uniformly due to the variations in the cross-section of the borehole 20, irregularities in construction of the bladder 12, and/or difference in resistance to expansion between the covered portion and the exposed portion of the reinforcement layer 14. An improved inflatable packer and method comprises pre- stretching the bladder 12 to keep the bladder in tension and minimize the occurrence of Z-folds.

Garniture d'étanchéité gonflable (10) améliorée, dotée d'une vessie préalablement étirée pour réduire au minimum le pliage en accordéon. Un corps extérieur expansible (11) comprend une couche élastomère intérieure de vessie (12), une couche de renfort (14), laquelle peut comprendre des lattes ou des câbles qui se chevauchent, et une couche élastomère extérieure de couverture (16), laquelle peut ne recouvrir qu'une partie de la couche de renfort (14). La vessie (12) peut prendre de l'expansion de façon non uniforme en raison des variations dans la section transversale du trou de forage (20), d'irrégularités dans la construction de la vessie ou de l'écart de résistance à l'expansion entre la partie recouverte et la partie exposée de la couche de renfort (14). L'invention concerne une garniture d'étanchéité gonflable améliorée et une méthode connexe qui comprend l'étirement préalable de la vessie (12) pour la maintenir tendue et réduire au minimum les risques de pliage en accordéon.

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