Patent ID: 8740259

Claim:
A threaded connection comprising: a first pipe having an internal liner and a first pin end on a distal end thereof, the first pin end comprising a first annular seal permanently affixed therein; a second pipe having an internal liner and a second pin end on a distal end thereof, the second pin end comprising a second annular seal permanently affixed therein; and a coupling comprising a first and second box end; wherein the first pin end and the first box end, and the second pin end and the second box end are threadedly engaged; wherein a mating surface of the first annular seal contacts a mating surface of the second annular seal at an angle to provide a continuous internal seal along an axial length of the threaded connection, and wherein the first annular seal comprises an annular groove formed on an inner surface of the first annular seal and extending in a radial direction such that the annular groove is in communication with the through-bore of the threaded connection to allow the first and second annular seals to axially compress under a load parallel to the central axis of the threaded connection.