Mechanical Response Analysis of Riser Considering Ocean Water Viscosity Difference
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摘要: 随着海洋深水钻井技术不断成熟,隔水管系统的稳定性和安全性研究越来越重要,现有研究多是基于海洋水体呈现出各向同性的性质的假设下,然而经研究发现忽略海洋水体的粘度差异设置相关波浪参数及海流参数进行力学响应分析有过度简化的性质。为更详细地研究隔水管水下力学动态响应,本文在考虑粘度差异影响下,建立了相关振动模型,利用MATLAB进行了数值求解和曲线拟合,通过对不同深度下的隔水管进行了横向振动分析和纵向比较,发现平台漂移量会对隔水管所受弯矩及剪力造成较大的负担,在大漂移情况下对隔水管的材料性能是严峻的考验;另一方面,随着水深的增大,柔性隔水管的不稳定性逐渐增大,且海流力对隔水管的影响将强于波浪力对隔水管的影响。Abstract: With the development of offshore deepwater drilling technology, the stability and safety of riser system is becoming more and more important. The research literature is based on the hypothesis that the ocean water is isotropic. However, it is found that the mechanical response analysis based on neglecting the viscosity difference of ocean water and setting the relevant wave parameters and current parameters is oversimplified. In order to study the dynamic response of riser in underwater mechanics in more detail, this paper establishes relevant vibration model under the influence of viscosity difference, carries out numerical solution and curve fitting with MATLAB. Through horizontal vibration analysis and longitudinal comparison of riser in different depths, it is found that the platform drift will cause the bending moment and shear force of riser. On the other hand, with the increase of water depth, the instability of flexible riser increases gradually, and the influence of ocean current force on riser will be stronger than that of wave force on riser.
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Key words:
- riser /
- stability /
- viscosity difference /
- dynamic response /
- MATLAB /
- vibration analysis
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表 1 雷诺数与拖曳系数的对应关系
区间 雷诺数Re 拖曳系数CD 亚临界区 Re < 2×105 ≈1.2 临界区 2×105 < Re < 5×105 ≈0.3 超临界区 5×105 < Re < 5×106 0.6~0.7 极临界区 Re> 5×106 0.6~0.7 表 2 不同水深隔水管趋于稳定处的深度(漂移量)
水深/m 稳定位置/m 无漂移量 含漂移量 2 000 820 200 2 500 900 240 3 500 950 280 表 3 不同水深隔水管趋于稳定处的深度(波周期)
水深/m 稳定位置/m 小波周期 大波周期 2 000 280 740 2 500 310 760 3 500 810 1 110 -
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