Patent ID: 6752436
Filing Date: 2004-06-22
Classification: E21B,F16L

Abstract:
A threaded male or female tubular element with an anti-fatigue profile for a threaded tubular connection capable of resisting both static and cyclic stresses, formed at the end of a pipe, comprising a male threading on its external peripheral surface or a female threading on its internal peripheral surface depending on whether the threaded element is of the male type or of the female type, said threaded tubular element comprising a waist in the form of a groove in the wall of the threaded element formed in correspondence with the threading starting from the peripheral surface of the threaded tubular element opposite that where the threading is formed without affecting the geometry of the threads of the threading, wherein the thickness of the wall beneath the threading is reduced by the groove at least at the level of the first engaging threads so as to reduce their stiffness and wherein at the level of the groove, the thickness of the wall beneath the threading is a minimum in a transverse plane located in the interval between the first engaging thread and the sixth engaging thread.