剪切流作用下隔水管张力响应机理试验研究  

Experimental study on the mechanism of the vortex-induced vibration of the drilling riser under shear flow

作　　者：刘清友[1,2] 毛良杰[1] 付强[3] 黄鑫[3] 杨秀夫[3] 何玉发 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西华大学,四川成都610039 [3]中国海洋石油总公司,北京100010 [4]中海油研究总院,北京100028

出　　处：《中国海上油气》2015年第5期82-87,92,共7页China Offshore Oil and Gas

基　　金：国家自然科学基金项目"基于钻井系统动力学的深海钻井升沉补偿系统机理研究(编号:51274171)";"十二五"国家科技重大专项"深水油气井测试关键技术研究(编号:2011ZX05026-001-07)"部分研究成果

摘　　要：开展了剪切流作用下隔水管涡激振动模拟试验,应用三分力仪采集涡激振动过程中隔水管张力响应特性,利用快速傅里叶变换获得张力响应频率,通过数据分析研究了剪切流作用下隔水管张力及其涡激振动响应机理。分析结果表明:剪切流作用下隔水管涡激振动横向与流向主导频率会反映到张力响应频率上,且流向主导频率是横向主导频率的2倍;剪切流作用下隔水管会以涡泄频率范围内对应的最大阶次固有频率振动,且由于初始拖曳力的影响而使涡激振动过程中主导频率比固有频率略微增大;剪切流作用下由于流速变化的影响会干扰隔水管涡激振动,从而使其横向和流向的振幅存在一定的非均匀性;增大预张力可提高隔水管自身固有频率并且降低涡激振动的振幅,从而抑制涡激振动。上述研究结果对于剪切流作用下的涡激振动控制具有重要意义。A series of experiments simulating deep-water environment were conducted to study vortex-in- duced vibration of the drilling riser under the effect of shear flow. The tension response was recorded with a three-component force sensor; the response frequency was transformed by the fast Fourier transform, and the mechanism of the tension response in VIV under the shear flow was investigated through data anal- ysis. The results show that the cross flow and in line dominant frequency was reflected in tension response frequency and the in line frequency was twice that of cross flow under the shear flow. The dominant fre- quency was the corresponding natural frequency of the riser in VIV under the shear flow, and the dominant frequency increased under the effect of the initial drag force. The vibration amplitude was not uniform be- cause of the influence of the variation flow speed under the shear flow. Increasing pretension increased nat- ural frequency and decreased the vibration amplitude, hence inhibiting the VIV and decreasing the chance of the ＂lock in＂ phenomenon, which was consistent with the previous research results.

关 键 词：隔水管 剪切流 涡激振动 张力响应 机理分析 模拟试验 

分 类 号：TE951[石油与天然气工程—石油机械设备]