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Helical strake vortex induced vibration inhibiting device

A technology of vortex-induced vibration and suppression device, which is applied in the directions of fluid flow, drilling equipment, earthwork drilling, etc., can solve the problems of increasing the hydrodynamic diameter of the riser, weakening the vibration suppression effect, and being difficult to manufacture, and achieves significant economic benefits, The effect of saving material and transportation costs and simplifying the manufacturing process

Active Publication Date: 2011-07-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cylindrical shell and the spiral strake are integrated, the mold required for its forming is very complicated, difficult to manufacture and expensive
On the other hand, the cylindrical shell increases the hydrodynamic diameter of the riser, weakening its vibration damping effect

Method used

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  • Helical strake vortex induced vibration inhibiting device
  • Helical strake vortex induced vibration inhibiting device
  • Helical strake vortex induced vibration inhibiting device

Examples

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 , figure 2 As shown, the present invention includes several strakes 1 , several chucks 2 and bandages 3 . Each strake 1 is arranged at intervals on the outer wall of the marine riser 4 , and is spirally arranged along the axial direction of the marine riser 4 .

[0017] Each chuck 2 is fixed on the marine riser 4 at intervals, and the distance between adjacent chucks 2 is one-third of the helical pitch of the strake 1 . Each chuck 2 is provided with several grooves, and each strake 1 is correspondingly arranged in a groove of the chuck 2 and fastened in the chuck 1 by a bandage 3 .

[0018] In the above example, if image 3 As shown, each chuck 2 includes an upper card 21 and a lower card 22 , the upper card 21 and the lower card 22 are pinned together by pins 23 , and the chuck 2 is fastened to the marine riser 4 by bolts...

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PUM

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Abstract

The invention relates to a helical strake vortex induced vibration inhibiting device. The device is characterized by comprising a plurality of strip strakes, a plurality of chucks and a ligature, wherein the strakes are alternately arranged on the outer wall of a marine riser, and are helically arranged along the axial direction of the marine riser; the chucks are alternately fixed on the marine riser, and a plurality of grooves are formed on each chuck; and each strake is arranged in the groove of the chuck corresponding, and is fastened in the chuck through the ligature. The device has a simple structure, and the strakes can adopt a continuous structure to facilitate marine on-site assembly, thus the efficiency of marine on-site assembly is remarkably improved, and the device has remarkable economic benefits, and can be applied to the marine riser widely.

Description

technical field [0001] The invention relates to the technical field of marine risers, in particular to a spiral strake vortex-induced vibration suppression device capable of effectively suppressing vortex-induced vibrations of marine risers. Background technique [0002] The marine riser is the main connection between the offshore platform and the subsea wellhead. The marine environmental loads borne by the marine riser mainly include wind, wave, current, ice and seismic loads, among which waves and currents are the most important marine loads. And the engineering structure affected by the water flow may generate vortex-induced vibration. Any engineering structure with a sufficiently steep trailing edge will shed the vortex within a certain range of Reynolds number, causing the structure to periodically vibrate in the direction perpendicular to the water flow. Therefore, when waves and currents flow through the riser, under certain flow conditions, strong vortices can be for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10F15D1/00
Inventor 贾旭陈晓贤徐阳矫滨田邹星许亮斌沙勇
Owner CHINA NAT OFFSHORE OIL CORP
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