Patent ID: 7931311

Claim:
An expandable tubular joint, comprising: a first tubular element comprising a first part, provided with a male thread, and a second part extending said first part and comprising i) a first outer surface, ii) a first annular lip having a first axial abutment surface and a first inner surface and delimited by said first outer surface over a part of the axial length thereof, and iii) a second abutment surface, and a second tubular element comprising i) a female thread, matching the male thread and screwed thereto, ii) a second annular lip having a third abutment surface, a second outer surface, arranged to face said first inner surface, and a second inner surface, iii) a fourth axial abutment surface, and iv) a third inner surface extending between said fourth axial abutment surface and said female thread and defining with said second outer surface and said fourth abutment surface an annular recess corresponding to said first lip, wherein said first tubular element comprises a selected local annular added thickness in the region of a fourth inner surface extending the second abutment surface and the local annular added thickness decreases in thickness in an axial direction extending toward the male thread of the first tubular element, wherein said second tubular element comprises, at a selected location of said third inner surface, an inner annular groove that faces, in a radial direction, said first outer surface and that lies in the same axial region as the local annular added thickness, and wherein said first and second tubular elements are shaped in such a way that said first lip is accommodated in said annular recess, and (i) said second abutment surface rests against said third abutment surface or (ii) said first abutment surface rests against said fourth abutment surface so as to allow, during a diametral expansion involving plastic deformation subsequently carried out on the expandable tubular joint, the formation, in the region of said first outer surface, of an annular shoulder having at least a part of the shape of the groove and being in sealing interference contact therewith.