A composite plugging device for horizontal subsea oil tree

Abstract

The invention discloses a horizontal type undersea Christmas tree composite device. The device comprises a pressure bearing device, an oil tube hanger, a sliding sleeve, an elastic lock ring and a sealing washer; the pressure bearing device is of a cylindrical structure and is composed of a main body, spring sliding block locking devices, a limiting body and a non-metal seal ring; each spring sliding block locking device is composed of a hanger locking piece, a spring and a moving sliding block; the limiting body is installed in a hollow structure on the upper portion of the main body, the lower end of the limiting body is of a conical columnar structure narrowing downwards, and a sealing slot is formed in the upper portion of the conical section; in each spring sliding block locking device, the outer side of the spring is connected with the hanger locking piece, and the inner side of the spring is connected with the moving sliding block; the spring sliding block locking devices are installed in a horizontal sliding groove in the middle of the main body; in an installation state, the moving sliding blocks make contact with the side face of the lower end of the limiting body; the oil tube hanger is provided with multiple functional channels. According to the horizontal type undersea Christmas tree composite device, design is optimized, the structure is simple, the space is saved, disassembly and assembly are convenient, and use is more convenient and rapid through multiple channels.

Description

technical field [0001] The invention relates to the field of offshore oil and gas development, in particular to a composite plugging device for a horizontal seabed Christmas tree. Background technique [0002] The horizontal Christmas tree is an important technical equipment in the development process of offshore oil and gas fields. As one of its important pressure-bearing parts, the plug is currently used with a wire rope plug, and forms a closed space under the sealing liquid cavity with the Christmas tree cap. , the main function is to bear the pressure from the fluid in the tubing below the tubing hanger, and make the production flow channel, annular flow channel and working flow channel of the whole horizontal oil tree form a closed space to ensure the safety of the operation of the whole tree . [0003] However, the current horizontal tree still has the following problems in use: (1) Wire rope plugs are practical for shallow seas, but for deep seas, it is inconvenient...

AI Technical Summary

Problems solved by technology

[0003] However, the current horizontal tree still has the following problems in use: (1) Wire rope plugs are practical for shallow seas, but for deep seas, it is inconvenient to install and take them out due to reasons such as deep water currents and pipe string deformation. At the same time, there is a certain safety risk, which is extremely unfavorable to the construction; (2) The installation configuration of the wire rope plug is two-stage. During the construction process, it is necessary to take out the whole Christmas tree cap first, then take out the inner Christmas tree cap, and then take them out separately Two wire rope plugs require a large amount of construction on site; (3) The design space occupied by the wire rope plug and its associated supporting devices is large, which is not conducive to the overall design; (4) There are no dedicated channels for cables, dosing, testing, etc. Additional holes need to be drilled on the Christmas tree, increasing the processing difficulty and reducing the strength of the Christmas tree

[0004] If the above problems are not solved, then in the actual use process, the installation and disassembly of the Christmas tree will always face safety risks, and at the same time increase the working hours. Finding a solution that can solve the above problems is the current research and development field of Christmas trees. an important issue

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