Patent ID: 8251139
Filing Date: 2012-08-28
Classification: E21B,F16L

Abstract:
1. A seal combination for mounting within the central receiving region of a coupling sleeve into which tubing pin ends are inserted at opposite ends of the sleeve, for maintenance of at least one of seal and corrosion bather integrity, despite repeated make-up of the elements in a tubing string with intervening disassembly, the combination comprising: a unitary seal ring body of resilient material and including a substantially central uniform outer diameter section extending longitudinally along the seal ring body and including terminating wings with tapers converging to an internal side and extending longitudinally to the opposite ends of the seal ring body, the seal ring body including a radially inwardly directed shoulder concentric with a central longitudinal axis and spaced apart from the longitudinal center of the seal ring body, the seal ring body also including, between the terminating wings, an inner circumferential seating surface of substantially uniform inner diameter and positioned longitudinally adjacent the shoulder, and a reinforcing ring of synthetic resin material having higher tensile and compressive modulus values and greater impermeability to permeating gasses than those of the seal ring body, said reinforcing ring having an outer circumference engaging the inner circumferential seating surface of the seal ring body longitudinally adjacent the shoulder extending therefrom, the reinforcing ring having a smaller inner radius than a radius of the inner circumference of the shoulder.