Patent ID: 7661728
Filing Date: 2010-02-16
Classification: E21B,F16L

Abstract:
1. A threaded tubular connection, comprising: a male tubular element having a male threading, the male threading including a male helical screw thread including a male crest, a male root, a male free end that is a flat surface perpendicular to an axis of the threaded connection, a male stabbing flank, and a male loading flank; a female tubular element comprising a female threading that cooperates by makeup with the male threading, an axial width of the threads of the male threading and the threads of the female threading and intervals between the threads varying progressively along an axis of connection over at least a portion of an axial length of the male threading and the female threading, the male threading and the female threading being configured such that the threads of each of the male threading and the female threading are housed with an axial clearance in the intervals of the other threading at a staff of makeup, the axial clearance progressively decreasing until the axial clearance becomes zero at an end of makeup, the female threading being a female helical screw thread including a female crest, a female root, a female free end that is a flat surface perpendicular to the axis of the threaded connection, a female stabbing flank, and a female loading flank; and at least one contact zone axially separated from the male threading and the female threading wherein the male and female elements are in sealed contact by bearing surfaces constituted by a cambered surface and by a tapered surface, the at least one contact zone including a first contact zone, the first contact zone including the cambered surface having a curved contact surface in contact with the tapered surface, the curved contact surface being curved along an axial direction, wherein the male free end does not abut the female tubular element and the female free end does not abut the male tubular element.