考虑粘度差异影响下隔水管力学响应分析  

Mechanical Response Analysis of Riser Considering Ocean Water Viscosity Difference

作　　者：钟功祥[1] 严鹏 张言开 吕志忠[1] Zhong Gongxiang;Yan Peng;Zhang Yankai;Lü Zhizhong(MOE Key Laboratory of Oil and Gas Equipment,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学石油天然气装备教育部重点实验室,成都610500

出　　处：《机械科学与技术》2020年第5期668-675,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：西南石油大学石油天然气装备教育部重点实验室2017年度开放课题项目(OGE201702-06)资助。

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。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.

关 键 词：隔水管 稳定性 粘度差异 动态响应 MATLAB 振动分析 

分 类 号：TE951[石油与天然气工程—石油机械设备]