REDUCTION METHOD OF VORTEX-INDUCED VIBRATION OF A PLURALITY OF RAISERS, SYSTEM OF A PLURALITY OF RAISERS REDUCING VORTEX-INDUCED VIBRATION, AND PHASE CHANGE JOINT AS WELL AS ASYMMETRICALLY ARRANGED BRACKETS FOR SYSTEM OF A PLURALITY OF RAISERS

To provide a reduction method of vortex-induced vibration (VIV: Vortex-Induced Vibration) reducing the vortex-induced vibration generated in a raiser installed underwater.SOLUTION: A reduction method of vortex-induced vibration generated by a water flow in a plurality of raisers 22 arranged underwat...

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Hauptverfasser:	ARAKI MOTOKI, YAMAMOTO JOJI, YAMAMOTO MARCIO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Zusammenfassung:	To provide a reduction method of vortex-induced vibration (VIV: Vortex-Induced Vibration) reducing the vortex-induced vibration generated in a raiser installed underwater.SOLUTION: A reduction method of vortex-induced vibration generated by a water flow in a plurality of raisers 22 arranged underwater is to reduce the vortex-induced vibration generated in the plurality of raisers 22 by a water flow through cancellation by arranging positions of the plurality of raisers 22 to be different positions, or to reduce the vortex-induced vibration generated in the plurality of raisers 22 by suppressing influence of vortex generated in the plurality of raisers 22 by a water flow.SELECTED DRAWING: Figure 2 【課題】水中に設けられたライザー管に生ずる渦励振（ＶＩＶ:Vortex-Induced Vibration）を低減させる。【解決手段】水中に設けられた複数のライザー管２２の水流により生じる渦励振を低減する方法であって、複数のライザー管２２の配置を互いに異ならせることにより水流により複数のライザー管２２に発生する渦励振を相殺して低減する、又は、水流により複数のライザー管２２により発生する渦の影響を抑制して複数のライザー管２２に発生する渦励振を低減する。【選択図】図２