Deepwater pipe in pipe buckle arrestor based on deformed element with Y-type section

Abstract

The invention relates to a deepwater pipe in pipe buckle arrestor based on a deformed element with a Y-type section. The deepwater pipe in pipe buckle arrestor is characterized in that the deformed element with the Y-type section is additionally arranged in ring-shaped spaces of inner and outer pipes of a pipe in pipe. The deformed element with the Y-type section forms axial linkage according to concave-convex characteristics of the deformed element, so that the pipe in pipe has certain flexibility, and local strength of a pipeline can be strengthened by the strength of the pipe in pipe, and therefore, the buckle arresting effect is achieved. The pipe in pipe buckle arrestor, which is composed of the deformed element with the Y-type section and a polymer shell, is directly mounted between inner and outer pipes without the needs of changing the dimension of the pipe in pipe, and a heat-insulating device in the pipe in pipe is not affected. The buckle arrestor further has universality, can be cut according to the pipes in pipes with different dimensions, can be directly mounted on the outer pipe by a pipe in pipe manufacturer; the polymer shell made of a thermal insulation material further can improve the thermal insulation of the buckle arrestor. While having certain buckling performance, the deepwater pipe in pipe buckle arrestor can prevent buckling and buckling transmission, in storage, mounting and operation, of the deepwater pipe in pipe, so that the mounting efficiency and the buckle-arresting efficiency of the deepwater pipe in pipe are improved, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of laying submarine pipeline facilities, and in particular relates to a buckling arrester which uses a Y-shaped section deformation element to prevent buckling propagation. Background technique [0002] Submarine pipelines are an important part of offshore oil and gas development. Under the special environment of the seabed, especially under the action of high hydrostatic pressure, the buckling problem has been hindering the development of submarine pipelines for a long time. [0003] Buckling generally has two processes: first: the external local pressure is greater than the strength of the pipeline at this location, causing the pipeline to collapse at this location; second, after the local collapse of the pipeline, if the strength of the adjacent pipeline is less than the critical buckling propagation The buckling propagation phenomenon will occur. The study found that the minimum pressure for maintainin...

AI Technical Summary

Problems solved by technology

[0010] The three types of buckle arresters, integral, sliding and jacketed, all significantly increase the local diameter of the pipe, which brings inconvenience to the transportation and storage of the pipe

The integral buckle arrester is connected to the pipeline by welding, which is prone to welding defects and stress concentration

Although the sliding type and the jacket type do not require welding, the structure is relatively simple, and the installation is relatively convenient, but the anti-bending efficiency is low, and "U-shaped crossing" is prone to occur, so they are only suitable for shallow water and deep pipelines.

[0011] Compared with the above three types of buckle arresters, the inner ring buckle arrester does not change the outer diameter of the pipe, and has higher buckle arrest efficiency, but it is not convenient to manufacture and install, and the economic cost is also higher than the above three forms of buckle arresters device

In addition, since the main part of the reinforcement is the pipe ring that is close to the outer pipe, the local damage caused during the laying process cannot be restored during operation

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