Self-swaging threaded tubular connection

An integral pipe connection for connecting like joints of non-upset pipe together, each joint being formed at an end with tapered external pin threads and formed at the other end with tapered internal box threads for cooperation with the pin threads of another such joint, the threads having a predetermined radial depth, comprising:

• the pin and box threads being formed on pipe ends of original pipe diameter and dimensioned such that as they are screwed together from the hand tight position to the desired position of makeup, the pin will be plastically swaged inwardly to a first predetermined configuration such that pin threads nearest the pin face will be mounted on a pipe wall having a thickness not less than the radial depth so as to engage mating box threads near the pipe bore and the box will be plastically swaged outwardly to a second predetermined configuration such that box threads nearest the box face will be mounted on a pipe wall having a thickness not less than the radial depth so as to engage mating pin threads near the pin outermost diameter;
• such that the pipe connection strength will exceed 65% of, the pipe wall strength that existed before forming of the threads.