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

Claim 0:
1. A leak-resistant threaded pipe connection, comprising:
a pin end having a primary pin shoulder, external pin threads having a thread taper and a pin nose with a secondary pin shoulder and an annular seal bulge having an apex with an external diameter at the apex, the annular seal bulge being between the external pin threads and the secondary pin shoulder;
a box end having a primary box shoulder, internal box threads having the thread taper arranged for connection with the external pin threads and a tapered seal area between the internal box threads and a box internal shoulder, the tapered seal area being tapered from a box pre-taper area to a box post-taper area at an angle that is greater than the thread taper, the tapered seal area having an internal diameter at the box post-taper area that is smaller than the external diameter of the pin end at the apex of the annular seal bulge of the pin end;
whereby on initial make-up to a recommended make-up torque, the annular seal bulge is plasticly deformed against the tapered seal area to provide a leak-resistant metal-to-metal seal between the pin end and the box end.