Global buckling control method for anchoring disc type nakedly-laid submarine pipeline

Abstract

The invention relates to a global buckling control method for an anchoring disc type nakedly-laid submarine pipeline. Adopted devices include an anchoring disc (1) used for bearing a pipeline (5), a slide bearing (2), mooring cables (3) and self-unlocking hooks (4). The method includes the steps that before the submarine pipeline is laid, the adopted devices are fixedly connected to preset positions of the pipeline firstly; in the pipeline laying process, the hooks in self-unlocking structures are hung in hook holes in a protection layer structure, the anchoring disc and the pipeline form a whole, and the anchoring disc falls onto a seabed along with the pipeline; the anchoring disc firstly falls onto the seabed, and then the pipeline continues to fall, the hooks in the self-unlocking structures are gradually separated from the hook holes in the protection layer structure at the moment, and the pipeline is pressed on the anchoring disc; and under the effect of the dead weight and the weight of the pipeline, a cylinder on the anchoring disc is inserted in the seabed. The global buckling control method for the anchoring disc type nakedly-laid submarine pipeline can effectively solve the problem that the lateral displacement is too large in the global buckling process of the deep sea nakedly-laid pipeline.

Description

Technical field [0001] The invention belongs to the field of overall buckling control of bare pipelines, and is used for lateral displacement control when overall buckling of pipelines occurs. Background technique [0002] With the development of offshore engineering technology and the development of offshore oil and gas resources, especially the exploitation of deep-water oilfields and marginal oilfields, the working pressure of submarine pipelines continues to increase, and their design temperatures generally reach above 100°C, even 150°C. Submarine pipelines that mostly work in high temperature and high pressure environments. Under the joint action of thermal load and pressure load, the pipeline will undergo axial deformation, and under the limitation of the surrounding soil, the pipeline will bear large axial stress. When the axial stress reaches a certain value, the overall buckling of the pipeline will occur, including axial overall movement, vertical buckling and lat...

AI Technical Summary

Problems solved by technology

The device in this method increases the lateral soil resistance on the pipeline when the lateral movement distance of the pipeline reaches the designed limit safety distance, thereby controlling the further increase of the lateral displacement of the pipeline and effectively solving the overall buckling process of the deep-sea bare pipeline. The problem of excessive lateral displacement

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