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Metal sealing structure for end of tubing hanger

A technology of metal sealing and metal sealing ring, which is applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., and can solve problems such as inability to judge, leakage, and different detection pressures of metal seal sealing reliability , to achieve the effect of saving installation and debugging time, facilitating assembly and simple structure

Pending Publication Date: 2018-06-01
SUZHOU UNIQUE FLOW CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When installing and debugging at the wellhead, it is impossible to judge the sealing reliability of metal seals due to the difference between the external and internal test pressures.
The metal seals at the end of the tubing hanger currently in use are for one-time use, special tools are required for installation and disassembly, and the installation requires the installer to have high operating skills, otherwise leakage will occur

Method used

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  • Metal sealing structure for end of tubing hanger
  • Metal sealing structure for end of tubing hanger
  • Metal sealing structure for end of tubing hanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as Figure 1 to Figure 3 As shown, a metal sealing structure for the end of the oil pipe hanger, including a sealing body, the sealing body is composed of a sealing body body 1 and a metal sealing joint 5, and the metal sealing joint 5 will not reduce the strength of the sealed carrier , a circlip 4, half of the circlip 4 is embedded in the outer end surface of the sealing body 1, a support ring 3, the support ring 3 is arranged on the outside of the metal sealing joint 5, a metal sealing ring 2, The metal sealing ring 2 is set in the support ring 3, and the left and right sides of the metal sealing ring 2 are provided with stress relief grooves 6, and one of the stress relief grooves 6 is arranged close to the metal sealing joint 5 On one side of the metal sealing ring 2, there are a pair of deformation grooves 7 on the left and right sides. The sealing between the metal seal at the end of the tubing hanger and the inner surface of the sealed carrier is a metal-to...

Embodiment 2

[0027] On the basis of the above embodiments, the metal sealing ring 2 is tubular and its cross section is diamond-shaped, and the metal sealing ring 2 is sealed through the diamond-shaped cross section. The metal sealing ring 2 can withstand 30000Psi working pressure at normal temperature, Both the stress relief groove 6 and the deformation groove 7 are set at the center of the rhombic cross section of the metal seal ring 2 as a central symmetrical point, the deformation groove 7 is arranged inside the stress relief groove 6, and the Both the stress relief groove 6 and the deformation groove 7 are arc grooves, and the diameter of the stress relief groove 6 is smaller than the diameter of the deformation groove 7 .

[0028] The two diagonal corners of the section of the metal sealing ring 2 are contact points, and the contact points are in contact with the sealing body and the sealed carrier respectively, because the hardness of the material used by the metal sealing ring 2 is ...

Embodiment 3

[0030] On the basis of the above embodiments, the sealing body is a mandrel-type sealing body, and the wall thickness of the mandrel-type sealing body is designed to withstand a working pressure of 10,000 Psi, so that the external detection pressure of the metal sealing joint 5 and the internal The detection pressure can be kept consistent, and the metal sealing joint 5 is made of carbon steel, low alloy steel, 300 series stainless steel and corrosion-resistant alloy material and is seamlessly connected with the sealing body 1, so the metal sealing joint 5 can be Used in a wider range of fields, especially for hydrogen sulfide and carbon dioxide corrosion conditions, the metal sealing joint 5 can be used for low temperatures below -60°C and high temperatures above 345°C.

[0031] The outer end surface of the metal seal ring 2 forms an included angle with the contact surface of the support ring 3, and the included angle is 5°-15°, which is determined by the inconsistency of the ...

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Abstract

The invention discloses a metal sealing structure for the end of a tubing hanger. The metal sealing structure comprises a sealing body, elastic retaining rings, supporting rings and metal sealing rings. The sealing body is composed of a sealing main body and metal sealing joints; halves of the elastic retaining rings are inlaid in the outer end faces of the sealing main body; the supporting ringsare arranged on the outer sides of the metal sealing joints; the metal sealing rings are arranged in the supporting rings; stress relief grooves are formed in the left sides and the right sides of themetal sealing rings correspondingly, and one of the stress relief grooves is formed in the side close to the corresponding metal sealing joint; and a pair of deformation grooves is formed in each ofthe left sides and the right sides of the metal sealing rings. According to the metal sealing structure, internal parts can be mutually replaced, special tools are not needed for mounting and dismounting, assembling is facilitated, the mounting and debugging time is shortened, and the downtime is reduced to the minimum limit.

Description

technical field [0001] The invention relates to a metal sealing structure, in particular to a metal sealing structure used for an oil pipe hanging end, and belongs to the technical field of petroleum production and processing. Background technique [0002] In land oil fields or offshore platforms, for high pressure, gas, and oil production or gas production wellhead devices containing corrosive media, for safety, a metal-to-metal seal is required between the end of the tubing hanger and the transition flange of the tubing head. The metal seal is a special sealing device composed of its own body and the sealed carrier. In the specification field of API 6A, the sealed carrier refers to the tubing head conversion flange and tubing hanger. In the wellhead installation of oil or gas production , There needs to be a fairly reliable seal between the end of the tubing hanger and the transition flange of the tubing head. [0003] In the field of oil production or gas production well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/03
CPCE21B33/03
Inventor 吴建勇孙国安孙聚才刘丽佳
Owner SUZHOU UNIQUE FLOW CONTROL TECH CO LTD
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