Patent ID: 8151461

Claim:
A method for producing a sealed threaded tubular connection starting from an initial threaded tubular connection including a first male tubular element including a first male threading and a second female tubular element including a second female threading, homologous with the first threading, the method comprising: making the first threading up into the second threading to bring the first and second elements into a connected position; and subjecting the initial threaded tubular connection to a diametral expansion in a region of plastic deformation using an expansion tool with a diameter that is greater than an internal diameter of the tubular elements, which is axially displaced in the connection, wherein each of the first and second threadings is separated into two portions separated from each other in an axial direction and, in a contact zone extending over a fraction of the length of the connection included between the threading portions, the male and female elements have smooth surfaces facing radially outwardly and inwardly respectively, which fit into one another over an entire axial length of the contact zone during the making up, a mechanism being provided to endow the female element in the contact zone with a spring back displacement after expansion that is greater than that of the male element, to establish a local sealed contact by a radial interference fit between the smooth surfaces, and wherein the spring back displacement mechanism is not provided by a ring inserted over the contact zone.