Patent ID: 6347814
Filing Date: 2002-02-19
Classification: E21B,F16L

Abstract:
An integral joint for the connection of two pipes, comprising:a) a box element having a tapered-conical longitudinal section within which an internal two-step thread is machined at an end of a first pipe; b) a pin element having a tapered-conical longitudinal section within which an external two-step thread is machined at an end of a second pipe, said pin element suitable for making-up inside the box elements and thereby forming a connection; c) a first shoulder, orthogonal to the axis of the first pipe, positioned on the pin element, half-way along the thread; d) a second shoulder, orthogonal to the axis of the second pipe, positioned half-way along the thread of the box element and capable of mating with the first shoulder of the pin element when the connection is made-up; e) a first inset machined at the beginning of the box element and a second inset machined at the end of the box element; f) a first flare machined at the beginning of the pin element and a second flare machined at the end of the pin element, said first flare and said second inset interfacing, said second flare and said first inset interfacing; g) a first annular slot dispersed between the first flare and beginning of the thread of the pin element there is an annular slot, a depth of said first annular slot is recovered with a pin shoulder having a thickness substantially equal to the depth of said slot, disposed at the end of the thread; and h) a second annular slot disposed between an initial inset of the pin element and a beginning of the internal thread, a depth of said second annular slot is recovered by one of a corresponding shoulder and the inset at the end of the internal thread.