Deepwater pipe-in-pipe buckle arrestor based on CX section deformation elements

Abstract

The invention relates to a deepwater pipe-in-pipe buckle arrestor based on CX section deformation elements. The buckle arrestor is characterized in that the CX section deformation elements are additionally arranged in an annular space between an inner pipe and an outer pipe of a pipe-in-pipe pipeline. The CX section deformation elements enable the pipeline to have certain bending performance through interlocking according to concave-convex characteristics of C type elements and X type elements, and the CX section deformation elements with the strength can perform the function of resisting outer pressure. According to the pipe-in-pipe buckle arrestor based on the CX section deformation elements, the size of the pipe-in-pipe pipeline does not need to be changed, and the CX section deformation elements are directly mounted between the inner pipe and the outer pipe and cannot influence thermal insulation devices in the pipe-in-pipe pipeline. The buckle arrestor further has universality, can be cut according to a pipe-in-pipe pipeline in any size and can be directly mounted on the outer pipe by a pipe-in-pipe pipeline manufacturer, and the thermal insulation performance of the buckle arrestor can be further improved due to use of a polymer casing made from a thermal insulating material. The buckle arrestor can prevent a deepwater pipe-in-pipe pipeline from buckling and buckling spreading in the storage, mounting and operation processes, meanwhile, the pipeline has certain flexibility, the laying and buckling efficiency of the deepwater pipe-in-pipe pipeline can be 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 CX section deformation element to prevent buckling propagation. Background technique [0002] As a fluid medium transportation tool, the submarine pipeline has the advantages of economy, speed, and large transportation volume. It is the aorta and lifeline of offshore oil and gas development. In the special environment of the seabed, especially the environment of high hydrostatic pressure, the problems of buckling, collapse and propagation have been hindering the development of submarine pipelines for a long time. [0003] Buckling occurs in 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 occurs, if the strength of the adjacent pipe wall is less ...

AI Technical Summary

Problems solved by technology

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

Images