Deepwater subsea pipeline flexion stopper

Abstract

The invention relates to a deepwater subsea pipeline flexion stopper. The deepwater subsea pipeline flexion stopper is characterized by comprising a flexion stopper body, wherein the flexion stopper body is a cylindrical shell; the internal diameter of the flexion stopper body is smaller than that of a subsea pipeline; the flexion stopper body is sequentially divided into first-level steps, second-level steps and a third-level step from a small external diameter to a large external diameter; the third-level step is positioned on the middle part of the flexion stopper body; the second-level steps are arranged on the two sides of the third-level step; the first-level steps are arranged on the other sides of the two second-level steps; the external diameters of the first-level steps are smaller than the internal diameter of the subsea pipeline; the external diameters of the second-level steps are equal to that of the subsea pipeline; and the external diameter of the third-level step is larger than that of the subsea pipeline. In a welding process of the deepwater subsea pipeline flexion stopper, complicated technical requirements are avoided; the first-level steps can be used as sunk pads during butt welding with the subsea pipeline, so that the welding quality of the subsea pipeline can be improved and the flexion stopping capability of the deepwater subsea pipeline flexion stopper can be improved; and when used in a deepwater environment, the deepwater subsea pipeline flexion stopper has higher flexion stopping capability, greatly reduces the welding quality, and can be widely applied to the subsea pipeline in the deepwater environment.

Description

technical field [0001] The invention relates to a buckle arrester, in particular to a buckle arrester connected with a deep-water submarine pipeline. Background technique [0002] Submarine pipeline is an important way of oil and gas transportation in offshore oil engineering, and its safe operation is the key to ensure the smooth progress of offshore oil and gas production. Due to the deep water depth of the deep-water submarine pipeline, it will bear huge hydrostatic pressure. Deep-water pipelines laid on the seabed may be hit by heavy objects such as anchors, which will cause their own geometric defects; the low-temperature environment in deep water and the hot oil transported in the pipeline constitute a temperature difference between the inside and outside of the pipeline, which will cause axial deformation of the pipeline; Unreasonable operation in the pipe process may cause excessive bending moment in the vertical bend section; special marine environment and transpor...

AI Technical Summary

Problems solved by technology

Correspondingly, the possibility of damage to the weld is very high. Mild damage is only the connection of trachoma in the weld, and small leakage occurs under the joint action of external water pressure and internal pressure; in severe damage, cracks or even cracks, which will cause serious leakage accidents

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