Method for inhibiting vortex-induced vibration of marine riser

Abstract

The invention belongs to the technical field of laying of marine risers and relates to a method for inhibiting vortex-induced vibration of a marine riser. The method comprises the following steps: (1) manufacturing a plurality of pairs of semi-circular ring-shaped shells of the same size according to the size of the outer diameter of the marine riser, wherein spiral strakes and spiral grooves arearranged on the outer surface of each shell in a staggered manner, when each pair of shells are combined into an annular column, and the spiral strakes or the grooves distributed on the outer surfaces of the two shells are combined into a spiral structure; and (2) fixedly mounting one pair of shells in the radial direction of the marine riser at intervals, wherein the two shells are closely jointed on the surface of a pipeline, a sleeve is formed in a way of combining the spiral strakes or the grooves on the outer surfaces of the two shells into the spiral structure, and the sleeve is fixedlyconnected to the marine riser. By adopting the method, the vortex-induced vibration of the marine riser can be effectively controlled, and the unification of economy and safety can be realized.

Description

technical field [0001] The invention belongs to the technical field of marine riser laying, and in particular relates to a method capable of suppressing vortex-induced vibration of a marine riser. Background technique [0002] During the laying and production of marine risers at sea, under the long-term action of environmental loads such as ocean currents and internal waves, vortex-induced vibration is prone to occur and cause fatigue failure, leading to serious consequences such as facility damage or even shutdown, which brings serious consequences to the development of offshore oil and natural gas. Therefore, the suppression of vortex-induced vibration is of great significance for marine riser engineering. [0003] Over the decades, many forms of containment measures have been proposed and widely used in the marine engineering community, including: surface protrusions (threads, lines, fins, etc.), wrappings (perforations, wire mesh, Control rods and axial slats, etc.) and...

AI Technical Summary

Problems solved by technology

However, most suppression measures with simple structures have unidirectional characteristics, and omnidirectional suppression measures with complex structures have better performance, but the design, manufacture and installation costs are high, and often cause the increase of the drag force of the main pipe, and there is also dynamic instability. And other issues

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