Patent ID: 8894070
Filing Date: 2014-11-25
Classification: E21B,F16J,F16L

Abstract:
1. A well tool, comprising: an internal cylindrical sealing surface; an external cylindrical sealing surface; and a sealing device that seals between the internal and external cylindrical sealing surfaces, the sealing device including a metal seal with at least first and second metal sealing surfaces, the metal seal having a generally I-shaped cross-section, wherein the metal seal prevents fluid flow through the sealing device, the first metal sealing surface forming a metal to metal seal with the internal cylindrical sealing surface, and the second metal sealing surface forming a metal to metal seal with the external cylindrical sealing surface, wherein the sealing device further includes at least a first nonmetal seal disposed in a first transverse facing recess in the metal seal, the first recess positioned between the first and second metal sealing surfaces, wherein the first nonmetal seal biases the first metal sealing surface against the internal cylindrical sealing surface and biases the second metal sealing surface against the external cylindrical sealing surface in response to a first pressure differential across the sealing device, wherein the sealing device further includes a second nonmetal seal disposed in a second transverse facing recess in the metal seal, the second recess positioned between the third and fourth metal sealing surfaces, wherein the second nonmetal seal biases the third metal sealing surface against the internal cylindrical sealing surface and biases the fourth metal sealing surface against the external cylindrical sealing surface in response to a second pressure differential across the sealing device, the second pressure differential being in an opposite direction to the first pressure differential, wherein the first and second nonmetal seals are in contact with the internal and external cylindrical sealing surfaces, and wherein the first nonmetal seal includes a third transverse facing recess which axially overlaps at least a portion of the first recess, and the second nonmetal seal includes a fourth transverse facing recess which axially overlaps at least a portion of the second recess.