Pre-formed stress rings for inflatable packers

Details Pre-formed stress rings for inflatable packers Pre-formed stress rings for inflatable packers

E - Fixed Constructions

21

B

E21B 33/127 (2006.01)

Patent

CA 2130957

An inflatable packer apparatus for use in a well bore has pre-formed metal stress rings surrounding the respective opposite end portions of the packer element. The stress rings are machined to initially have conical outer surfaces, and then are outwardly stressed beyond their yield strengths to obtain plastic deformation such that such outer surfaces are generally cylindrical so that the packer element can be inflated to higher pressures.

Le dispositif pour packer gonflable devant servir dans un puits comporte des bagues métalliques déformables préformées qui entourent les extrémités opposées respectives du packer. Les bagues déformables sont usinées de manière à avoir initialement des surfaces extérieures coniques, et elles sont ensuite repoussées au-delà de leur limite apparente d'élasticité pour que, par déformation élastique ces surfaces extérieures deviennent généralement cylindriques, ce qui permet le gonflage du packer à des pressions plus élevées.

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