Method for fixing seabed pipeline and preventing buckle propagation

Abstract

The invention belongs to the technical field of seabed pipeline laying and particularly relates to a method for fixing a seabed pipeline and preventing buckle propagation. The method comprises: manufacturing a plurality of pairs of reversed U-shaped shells of which the inside diameters are the same and the outer edges are tangent according to the outside diameter and wall thickness specification of the seabed pipeline, wherein the upper parts of the shells are in semi-annular shapes and the lower parts of the shells have semi-cylindrical hollow cuboid bases; connecting the surfaces of the bases with barrel structures to form buckle preventing fixers; and mounting the fixers on the seabed pipeline at intervals along a radial direction. The method adopts a reasonable mounting process, and can simplify operation, reduce cost, effectively fix the seabed pipeline and prevent buckle propagation, and ensure the safe and stable operation of the seabed pipeline.

Description

technical field [0001] The invention belongs to the technical field of laying submarine pipeline facilities, and in particular relates to a method capable of fixing submarine pipelines and preventing buckling propagation. Background technique [0002] Submarine pipelines are the lifeblood of modern offshore oil and gas development and transportation, known as the "marine lifeline". With the development of deep-sea oil and gas fields, most of the pipelines will operate in sea areas with a water depth of 2000-3000 meters. Deep-sea pipelines are usually placed bare on the seabed. Submarine pipelines not only bear the functions of self-weight, external hydrostatic pressure, internal pressure, medium temperature, prestress, force of pipeline accessories, force of covering and seabed, force caused by pigging operation, etc. Moreover, it is affected by environmental loads such as wind, waves, currents and earthquakes, and also faces the challenges of extreme sea conditions, ship c...

AI Technical Summary

Problems solved by technology

[0004] However, traditional buckling arrest methods, such as outsourcing steel or expanding section reinforcement, can only control the local deformation of the part, but are powerless against the overall buckling

Even if the subsea pipeline installed with buckling arrestors is under complex loads, there is still the risk of large vertical uplift or lateral displacement. At present, there is no device that can prevent local buckling propagation and overall buckling.

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