Method for reducing diameter reduction near ends of expanded...

E - Fixed Constructions – 21 – B

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E21B 43/10 (2006.01) E21B 29/00 (2006.01)

Patent

CA 2646440

A method of expanding a tubular downhole, comprises positioning the tubular downhole, advancing an expansion device toward an end of the tubular, configuring at least one end of the tubular so as to eliminate or minimize, after expansion with the expansion device, the reduction in end drift diameter as compared to an interior portion of the tubular, and providing an insert adjacent an end of the tubular that will hold less residual hoop stress after expansion than the surrounding portion of the tubular.

Il s'agit d'une méthode qui permet l'expansion d'un fond de trou tubulaire et qui comprend les opérations qui suivent : le positionnement du fond de trou; la progression d'un dispositif d'expansion vers une extrémité de l'élément tubulaire; la configuration d'au moins une extrémité de l'élément tubulaire, de façon à éliminer ou à minimiser, après expansion avec le dispositif d'expansion, la réduction du diamètre de dérive d'extrémité, par comparaison avec une partie interne de l'élément tubulaire; et l'apport d'une chemise contiguë à une extrémité de l'élément tubulaire qui va maintenir moins de tension de charge résiduelle après l'expansion que la partie environnante de l'élément tubulaire.

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