Patent ID: 6712401
Filing Date: 2004-03-30
Classification: E21B,F16L

Abstract:
A threaded tubular connection comprising:a male threaded element at one end of a first pipe; and a female threaded element at one end of a second pipe; the male threaded element comprising a male threading and a male lip between a free end and said male threading, said male lip comprising an external peripheral surface terminating transversely with respect to an axis of the threaded tubular connection by a male end surface that is annular in shape; the female threaded element comprising a female threading corresponding to the male threading and a non-threaded female housing portion for housing the male lip, said female housing portion comprising an internal peripheral surface and a female shoulder surface, which is annular and with a partially transverse orientation, the male threading being made up into the female threading to a position in which the male annular end surface is engaged against the female shoulder surface, wherein, in a first state prior to an expansion, the annular surfaces of the male end surface and the female shoulder have complementary shapes for embedding the male end surface with the female shoulder surface, and wherein the external peripheral surface of the male lip is disposed with a small clearance from the internal peripheral surface of the female housing, and wherein, in a second state after said expansion, said external peripheral surface of said male lip and said internal peripheral surface of said female housing form sealing surfaces.