Metal sealing ring for end part of oil pipe hanger, and sealing device

Abstract

The invention discloses a metal sealing ring for an end part of an oil pipe hanger, and a sealing device. The metal sealing ring comprises a metal sealing ring body, wherein the longitudinal section of the metal sealing ring body is rhombic, and a plurality of annular stress relief grooves and deformation grooves which are horizontally arranged are formed in both of the inner wall and the outer wall of the metal sealing ring body at intervals from top to bottom. The sealing device comprises an upper support ring, a lower support ring and the metal sealing ring, wherein the upper support ring and the lower support ring are arranged on the top surface and the bottom surface of the metal sealing ring respectively; the bottom surface of the upper support ring is an inclined surface, and the inclined surface contacts with the vertex angle of the metal sealing ring body and has an angle difference; and the top surface of the lower support ring is an inclined surface, and the inclined surface contacts with the base angle of the metal sealing ring body and has an angle difference. The metal sealing ring and the sealing device, which are disclosed by the invention, have the advantages of being simple in structure, small in size, liable to deform, capable of forming metal sealing with a carrier, good in sealing reliability, and capable of being used for a corrosion environment; and meanwhile, stress deformation is elastic deformation, and the metal sealing ring and the sealing device can be repeatedly used without damage to the carrier, so that the cost can be reduced.

Description

technical field [0001] The invention belongs to the field of oil pipeline sealing joints, in particular to a metal sealing ring and a sealing device used for the end of an oil pipe hanger. Background technique [0002] In API6A (American Petroleum Institute, American Petroleum Institute) standard, for important oil or gas production wellheads, a reliable sealing connection between carriers is required during installation operations. [0003] For general wellheads, rubber seals are mostly used between the carrier and the carrier. However, the rubber seal cannot be used for a long time, and it will age and lose elasticity after long-term use. The rubber seal cannot be used in low temperature and high temperature. soften. [0004] For important wellheads used for low temperatures below -60°C, high temperatures above 350°C, and gas wells containing H2S, expensive metal seals are required between the carrier and the carrier, and metal seals are generally not used. Due to the in...

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Problems solved by technology

[0003] For general wellheads, rubber seals are mostly used between the carrier and the carrier. However, the rubber seal cannot be used for a long time, and it will age and lose elasticity after long-term use. The rubber seal cannot be used in low temperature and high temperature. soften

[0004] For important wellheads used for low temperatures below -60°C, high temperatures above 350°C, and gas wells containing H2S, expensive metal seals are required between the carrier and the carrier, and metal seals are generally not used. Due to the influence of time, temperature and corrosive media, the external and internal pressures of the metal seals currently used for sealing the end of the tubing hanger are inconsistent, so it is impossible to judge the reliability of the metal seal during the installation and commissioning of the wellhead. Yes, and this kind of seal is for one-time use, special tools are required for installation and removal, and there are certain requirements for installation

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