Deepwater sea floor reinforcing pipeline

Abstract

The invention belongs to the technical field of deepwater sea floor pipeline production and laying installation and relates to a deepwater sea floor reinforcing pipeline. The deepwater sea floor reinforcing pipeline comprises a reinforcing pipe section and two extension pipe sections which are respectively located at two ends of the reinforcing pipe section, wherein horizontal T-shaped ribs which are called toroidal skirt-boards (2) are arranged at the two ends of the reinforcing pipe section. Axial H-shaped reinforcing materials are arranged on the overall deepwater sea floor pipeline along the pipe direction at a certain interval angle, and thereby the vertical ribs (3) are formed. The deepwater sea floor reinforcing pipeline has the advantages of being simple in manufacturing and technology, few and light in materials and suitable for laying on sea floor positions which have special requirements on stability and safety.

Description

Technical field [0001] The invention belongs to the technical field of production, laying and installation of deep-water submarine pipelines, and in particular relates to a submarine pipeline. Background technique [0002] Submarine pipelines are the lifelines of deep sea oil and gas projects, and are responsible for oil and gas transportation. During in-situ operation, the external environment of deepwater submarine pipelines is significantly different from other engineering structures, and the environmental effects are characterized by high temperature, high pressure, and internal and external corrosion. This characteristic causes the main form of failure and damage of deepwater submarine pipelines to be stability failure, including local ring collapse (Collapse) and overall axial buckling (Buckle). [0003] Most of the stability failures of subsea pipeline structures belong to local buckling and collapse. Due to bending moments during laying or corrosion during subsea o...

AI Technical Summary

Problems solved by technology

[0007] (2) From the analysis of the comprehensive effect of the buckle arrester, although some designs claim to be able to suppress vortex-induced vibration and other failure forms of the pipeline while arresting buckle, the buckle arrester is only a part of the entire pipeline. structure, the effect of suppressing vortex-induced vibration or in-situ instability and other overall failures is generally

Especially for deep water production, high temperature oil and gas will lead to axial expansion of the pipeline, significant pressure load, and the possibility of overall instability is greatly increased

Some of the current devices and designs cannot not only play the function of ring anti-bending but also improve the overall in-situ stability

[0008] (3) From the perspective of economical application of the buckle arrester, the basic form of the buckle arrester is a thick-walled ring, which requires a certain thickness and length to achieve a certain buckle arrest effect, resulting in heavy weight and inconvenient installation. transportation

At the same time, special production is required, and the material consumption is relatively high, especially the snap-in and winding-type buckle arresters are often more complicated, and the requirements for welding quality are extremely high, resulting in higher costs.

The more complex designs of some buckle arresters have significant local stress effects and are less suitable for deepwater subsea pipelines

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