Abstract: The premium threaded tubular connection comprises, on at least one threaded element, a distal abutment surface (7) at the free end of a threaded element and a lip sealing surface (5) at a given distance from the threading.

Abstract: A threaded tubular connection comprises two elements, male and female, made up one into the other to a given torque in which, prior to making up, at least one thread face under contact pressure (125) has a convexly rounded shape that is continuous over its width with a radius of curvature in the range 2 to 60 mm and is in point contact with the corresponding face (26) of the mating element. Such a threaded connection has an increased resistance to breakout or to overtorquing.

Abstract: Fatigue-resistant threaded element for threaded tubular connection

Abstract: A threaded joint to be expanded, including a lip at the end of the male element end a housing for the lip on the female element to make the threaded joint capable of being sealed and of having a maximum internal passage cross-section after being subjected to diametral expansion by more than 10%. The free male end surface is socketed before expansion into a partially transverse shoulder surface of the female housing through the matching rebating shapes of the surfaces. And, the male lip outer peripheral surface is arranged with little play of the internal peripheral surface of the female housing. Such a threaded joint is particularly useful for casings and tubings used in oil wells.

Abstract: The invention concerns a threaded joint to be expanded, comprising a lip (5) at the end of the male element (1) and a housing for said lip on the female element (2) to make the threaded joint capable of being sealed and of having a maximum internal passage cross-section after being subjected to diametral expansion by more than 10%, the free male end surface (9) is socketed before expansion into a partially transverse shoulder surface (10) of the female housing through the matching rebating shapes of said surfaces and the male lip (5) outer peripheral surface (7) is arranged with little play of the internal peripheral surface (8) of the female housing (6). Such a threaded joint is particularly useful for casings and tubings used in oil wells.