Ring seal assembly of bidirectional metal seal structure

Abstract

The invention relates to a ring seal assembly of a bidirectional metal seal structure, which is used for a marine oil and gas extraction underwater wellhead system and comprises a seal driving sleeve, a locking sleeve and a metal sealing ring. The upper portion of the periphery of the locking sleeve is provided with an annular groove and a wellhead locking ring, the lower portion of the periphery of the locking sleeve is provided with an annular groove for mounting a support belt, a locking cavity is arranged at the lower end of an inner hole of the locking sleeve and corresponds to a hanger locking ring which is arranged below the locking cavity and on the upper portion of the inner hole of the seal driving sleeve, a bidirectional U-shaped seal ring is arranged at the lower end of the metal sealing ring, a radial pin hole is arranged on the periphery of the upper end of the metal sealing ring and matched with a shear pin arranged on the seal driving sleeve, and an annular groove is arranged below the radial pin hole and matched with a recovery ring arranged on the lower portion of the inner hole of the seal driving sleeve. The annular space between a wellhead and a casing hanger can be effectively sealed and hermetically self-locked, the ring seal assembly is high in damage resistance, long in service life, simple in structure and simple and convenient in assembly and disassembly procedures, rapid assembly and disassembly can be realized, and work efficiency is improved.

Description

technical field [0001] The invention relates to an annular sealing assembly of a bidirectional metal sealing structure used in an underwater wellhead head system for marine oil and gas exploitation, which is used for sealing the annular space between the underwater wellhead head and casing hanger. Background technique [0002] Due to the particularity and complexity of the working environment and sealing medium of offshore oil and gas exploitation, sealing has become a key link in offshore oil and gas exploitation equipment, and it is also one of the important factors affecting the performance of offshore oil and gas exploitation equipment. The ring-shaped sealing assembly commonly used in existing offshore oil and gas exploitation equipment has the following deficiencies: 1. There are many sealing parts, the structure is complicated, and the loading and unloading process is complicated and time-consuming; 2. It is easily affected by external pressure and temperature changes ...

AI Technical Summary

Problems solved by technology

The ring-shaped sealing assembly commonly used in existing offshore oil and gas exploitation equipment has the following deficiencies: 1. There are many sealing parts, the structure is complicated, and the loading and unloading process is complicated and time-consuming; 2. It is easily affected by external pressure and temperature changes and becomes loose, which affects the sealing performance; 3. Seals are easily damaged by high-pressure drilling fluid, resulting in seal failure

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