Patent ID: 7140428
Filing Date: 2006-11-28
Classification: E21B

Abstract:
1. A duplex expansion apparatus for expanding a wellbore tubular to two different diameters from an initial internal diameter, the duplex expansion apparatus comprising: a first diameter expansion cone that is, in a relaxed state, of a diameter less than the initial internal diameter and in an expanded state of a diameter greater than the initial internal diameter; a second diameter expansion cone that is, in a relaxed state, of a diameter less than the initial internal diameter and in an expanded state of a diameter greater than the diameter of the first diameter expansion cone in the expanded state; and an assembly mandrel that is capable of transferring both the first diameter expansion cone and the second diameter expansion cone into their expanded states; wherein the first diameter expansion cone and the second diameter expansion cone each comprises: a base having an outside diameter smaller than the initial internal diameter; and a plurality of deformable segments extending from the base wherein each of the plastically deformable segments are deformable to an expanded internal diameter and when deformed to the expanded internal diameter together form an expansion surface having gaps between the deformed segments that are not aligned with a centerline of the tubular.