Patent ID: 11898403
Assignee: FRAC STRING SOLUTIONS LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 7:
8. A method of providing a leak-resistant threaded pipe connection by performing an initial make-up to a recommended make-up torque by coining an annular seal bulge of a pin end of the threaded pipe connection, the pin end having a primary pin shoulder, external pin threads and a pin nose with a secondary pin shoulder and the annular seal bulge between the external pin threads and the secondary pin shoulder, and a box end of the threaded pipe connection having a primary box shoulder, internal box threads adapted for connection with the external pin threads and a tapered seal area between the box internal threads and a box internal shoulder, the tapered seal area being tapered from a box pre-taper area to a box post-taper area and having an internal diameter at the box post-taper area that is smaller than an external diameter of the pin end at an apex of the annular seal bulge, whereby the annular seal bulge is plastically deformed and coined against the tapered seal area when the threaded pipe connection is made-up to the recommended make-up torque.