Patent ID: 7883120
Filing Date: 2011-02-08
Classification: E21B,F16L

Abstract:
1. A male tubular element formed in an end region of a tube, the tube including a main body that has an external surface and internal surface of which have substantially circular transverse cross sections with a substantially constant diameter but that may not be perfectly concentric, the male tubular element comprising: a tapered male threading and at least one sealing surface, which cooperates by makeup with a female tubular element including a female tapered threading and at least one sealing surface to form a sealed threaded tubular connection in which the sealing surfaces are in mutual metal to metal sealing contact, the at least one sealing surface of the male tubular element being disposed on a lip disposed between the male threading and a free end, or beyond the male threading on a side opposite to the free end, the internal surface of the male tubular element including a cylindrical first zone adjacent to the free end of the male element, the cylindrical first zone of the internal surface of the male tubular element including a radius and being concentric with the external surface of the tube, wherein the internal surface of the male tubular element includes a cylindrical second zone that axially follows the cylindrical first zone, the cylindrical second zone of the internal surface of the male tubular element including a radius and being concentric with the external surface of the tube, the radius of the cylindrical second zone of the internal surface of the male tubular element being greater than the radius of the cylindrical first zone of the internal surface of the male tubular element, and the radius of the cylindrical second zone of the internal surface of the male tubular element being greater than a radius of the internal surface of the main body of the tube, the main body of the tube being a portion of the tube that is beyond the cylindrical second zone and the male threading on the side opposite to the free end.