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Sleeve for marine riser

A riser and marine technology, applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of high cost of design, manufacture and installation, dynamic instability, increased drag force of the main pipe, etc., to simplify the manufacturing process and reduce construction costs. cost, work efficiency improvement effect

Inactive Publication Date: 2011-10-26
HEBEI UNIV OF ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Sleeve for marine riser
  • Sleeve for marine riser
  • Sleeve for marine riser

Examples

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Embodiment Construction

[0014] The invention suppresses the vortex-induced vibration of the marine riser through the method of installing a sleeve with a helical structure at regular intervals on the marine riser. The main steps are as follows:

[0015] (1) According to the outer diameter of the marine riser to be protected, two semi-circular shells with the same size are made, which can be mass-produced through moulds.

[0016] (2) Put the first shell close to one side of the pipeline surface, and connect the other shell with the shell already in place through the position of the eye plate and the rotation direction of the helical structure.

[0017] (3) The two shells are fixed by 6 bolts. Bolts pass through the eye plate to connect the two shells to form a sleeve fixed on the outer surface of the pipeline.

[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] Front view of a section of a marine riser fi...

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PUM

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Abstract

The invention belongs to the technical field of laying of marine risers and relates to a sleeve for a marine riser. When in use, the sleeve for the marine riser is fixedly connected outside the marine riser, the sleeve for the marine riser comprises a pair of semi-circular ring-shaped shells which are manufactured according to the outer diameter of the marine riser and have the same size, spiral strakes and spiral grooves are arranged on the outer surfaces of the two semi-circular ring-shaped shells in a staggered manner, when the two shells are combined into an annular column, the spiral strakes or grooves distributed on the outer surfaces of the two shells are combined into a spiral structure. By adopting the sleeve for the marine riser, the cost can be reduced, 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 sleeve used for marine risers. 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 near-wake stabilizers (streamers, fairings...

Claims

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Application Information

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IPC IPC(8): E21B17/10F15D1/00
Inventor 杜尊峰梁静张贵珍刘小燕
Owner HEBEI UNIV OF ENG
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