Method of strengthening deep water seafloor pipeline stability

Abstract

The invention belongs to the technical field of deep water seafloor pipeline productions and laying installations, and particularly relates to a method of strengthening deep water seafloor pipeline stability. The method of strengthening the deep water seafloor pipeline stability includes three pipe sections with the uniform thickness and thinness requiring for strengthening the deep water seafloor pipeline are manufactured. The three pipe sections are one strengthening pipe section and two extending pipe sections. Narrow wing H-shaped steel and narrow wing T-shaped steel with the same width and the same size are selected according to the outer diameter and the length and the size of the pipe sections. The narrow wing T-shaped steel is machined to a strengthening material in the annular direction and is welded at two ends of the strengthening pipe fittings, thus the strengthening material in the radial direction is formed. The narrow wing H-shaped steel is welded on the strengthening pipe section and the extending pipe sections in a submerged arc welding way. Four narrow wing H-shaped steels are distributed on each pipe section and are distributed evenly on the outer cylindrical surfaces of the pipe fittings, thus the strengthening material in the axial direction is formed. The strengthening pipe section is welded with the extending pipe sections, thus a complete partial strengthening structure is formed. According to the method of strengthening the deep water seafloor pipeline stability, partial and complete stability of the deep water seafloor pipeline is strengthened and safety service life of the pipe line is prolonged.

Description

Technical field [0001] The invention belongs to the technical field of production, laying and installation of deep-water submarine pipelines, and relates to a method for enhancing the local and overall stability of deep-water submarine pipelines and improving the safety life of the pipelines. 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 belo...

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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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