海底管线水平向整体屈曲数值模拟研究

发布时间：2018-02-12 01:41

本文关键词： 海底管线水平向整体屈曲缺陷引入数值模拟　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年随着全球海洋石油业的迅速发展，海底管线被广泛应用于全球范围的石油、天然气开采中。为了防止石蜡堵塞管道，石油、天然气需要在高温、高压条件下输送，使得管线在温度荷载和内压荷载的作用下发生整体屈曲，导致管线发生破裂，造成严重的环境污染与经济损失。目前有关海底管线变形的监测数据较少，因此，建立一套完善的数值模拟方法具有重要的理论意义和实用价值。本文应用ABAQUS软件对海底管线水平向整体屈曲数值模拟方法进行了详细论述；创新性的提出了海底管线水平向整体屈曲数值模拟中引入初始缺陷的方法；提出了四种有限元模拟温度应力下海底管线水平向整体屈曲的方法，并运用这四种方法对工程算例进行了较为系统的分析和对比，将有限元计算结果与经典的缺陷管线水平向屈曲解析解进行了对照；围绕建模过程，对海底管线水平向整体屈曲影响因素进行了分析对比，通过工程实例，分析了海底管线水平向整体屈曲的多种影响因素，并将每种因素分别在其合理的范围内取值进行有限元计算，对每种因素参数选取的规律进行了分析；最后针对数值模拟中三个关键问题进行了讨论。研究表明：四种不同模拟方法得到的管线整体屈曲结果具有显著差异。原因在于三维分析模型中考虑了管线的自沉过程以及动力方法考虑了管线变形过程中速度的影响；海底管线水平向整体屈曲受多种因素影响，部分因素影响较为显著，主要体现在：温度荷载，管线直径，管线壁厚等，这些因素取值的变化，，对管线屈曲幅值和管线内部应力都有较为显著的改变；管线数值模拟中，模型边界的选取与计算长度的选取存在密切关联，不同的边界条件形式对应不同的计算长度；海底管线屈曲段水平向变形的速度对整体屈曲有显著影响，不同的水平向运动速度对应不同的水平向抗力，水平向运动速度越大整体屈曲变形越显著。
[Abstract]:In recent years, with the rapid development of the global marine oil industry, submarine pipelines are widely used in oil and natural gas exploitation worldwide. In order to prevent paraffin blockage, oil and natural gas need to be transported under high temperature and high pressure. Under the action of temperature load and internal pressure load, the pipeline buckles as a whole, resulting in the pipeline rupture, causing serious environmental pollution and economic loss. At present, there are few monitoring data on the deformation of submarine pipeline. It is of great theoretical significance and practical value to establish a set of perfect numerical simulation methods. In this paper, the numerical simulation method of horizontal overall buckling of submarine pipeline is discussed in detail by using ABAQUS software, and the method of introducing initial defects into numerical simulation of horizontal overall buckling of submarine pipeline is proposed. In this paper, four finite element methods for simulating the horizontal buckling of submarine pipelines under temperature stress are proposed, and the engineering examples are systematically analyzed and compared by using these four methods. The results of finite element analysis are compared with the classical analytical solutions of horizontal buckling of defective pipelines, and the influencing factors of horizontal buckling of submarine pipelines are analyzed and compared around the modeling process. This paper analyzes many factors influencing the overall horizontal buckling of submarine pipeline, and calculates each factor within its reasonable range by finite element method, and analyzes the rule of selecting each factor parameter. Finally, three key problems in numerical simulation are discussed. The results show that there are significant differences in the global buckling results obtained by the four simulation methods. The reason is that the self-sinking process of the pipeline and the influence of the velocity in the deformation process of the pipeline are taken into account in the three-dimensional analysis model. The overall horizontal buckling of submarine pipeline is affected by many factors, some of which are significant, mainly reflected in: temperature load, pipeline diameter, pipeline wall thickness and so on. In the pipeline numerical simulation, the selection of the model boundary is closely related to the selection of the calculated length, and different boundary conditions correspond to different calculated lengths. The velocity of horizontal deformation in the buckling section of submarine pipeline has a significant effect on the overall buckling. Different horizontal motion velocities correspond to different horizontal resistance, and the greater the horizontal velocity, the more obvious the global buckling deformation is.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.2

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