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 2646472

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, providing an external groove extending to the end of the tubular, and bending the end of the tubular away from the centerline of the tubular, before advancing the expansion device through the end, to create a taper that increases in diameter on approaching the end 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 rainure externe s'étendant jusqu'à l'extrémité de l'élément tubulaire et le pliage de l'extrémité de l'élément tubulaire loin de la ligne centrale de l'élément tubulaire, avant l'avancée du dispositif d'expansion par l'extrémité de l'élément tubulaire afin de créer un évasement qui augmente de diamètre à l'approche de l'extrémité de l'élément tubulaire.

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