非粘结柔性管道局部分析与数值模拟

发布时间：2018-03-31 13:41

本文选题：非粘结柔性管　切入点：数值模拟　出处：《中国海洋大学》2015年硕士论文

【摘要】：海洋油气资源开发系统是由海上作业平台、水下生产系统以及多种管缆组合而成的,具有采油、集油、输油等功能的系统。其中,管道是整个海洋油气资源开发过程当中最主要的运输方式。而非粘结柔性管,凭借其特殊的内部结构及良好的力学性能从各类管道结构中脱颖而出,逐渐成为了海洋油气资源开发过程中的主流运输设备。非粘结柔性管主要由骨架层、抗压铠装层、拉伸铠装层、内外护套以及防磨擦层等分别具有不同功能的多层材料组成。其内部多层结构是呈螺旋状缠绕而成的,各层之间存在大量接触与摩擦,导致了非粘结柔性管的非线性特性非常严重,使得我们在模拟和分析时存在很大难度。近年来,很多学者在提出特殊假设、进行多种简化的基础之上,对非粘结柔性管进行研究分析,但所得到的数据和结论用到实际工程中往往存在一定的偏差。另外,国外对这方面的技术严格保密,国内的研究又起步较晚,致使国内海洋油气开采所用的管道被迫从国外高价采购,这严重影响了我国能源战略和经济发展的进程。因此,对非粘结柔性管道进行局部力学性能分析和模拟计算,是为我国早日实现柔性管道自主化和量产化奠定基础和提供依据的必要过程。本文首先介绍了非粘结柔性管的主要结构形式和特点,并对国内外研究现状进行了详细的研究和总结,整理出柔性管道计算所用的理论公式模型,并对有限元分析的方法理论进行了介绍。在此基础之上,参照国际上比较权威的实验样管参数,运用等效简化的方式对各结构层进行了简化,并通过对比选择了合适的单元类型模拟各层结构,运用通用有限元软件ANSYS建立了三维的有限元模型并对其施加多种工况荷载进行计算分析。最后,采用国外机构所做试验中已经得到国际上认可的实验数据,与理论公式计算所得结果以及有限元模拟计算分析结果进行对比,以验证建模的正确性,并得出相关结论,对工程应用有一定的借鉴作用。
[Abstract]:Offshore oil and gas resources development system is composed of offshore operation platform, underwater production system and a variety of pipe cables. It has the functions of oil recovery, oil gathering, oil transportation and so on.Among them, pipeline is the most important transportation mode in the whole process of exploitation of offshore oil and gas resources.The non-bonded flexible pipe, with its special internal structure and good mechanical properties, has emerged from all kinds of pipeline structures, and has gradually become the mainstream transportation equipment in the development of offshore oil and gas resources.The unbonded flexible pipe is composed of several layers with different functions, such as skeleton layer, compression armor layer, tensile armor layer, inner and outer sheath and anti-friction layer.The internal multi-layer structure is spiral wound, and there are a lot of contact and friction between the layers, which leads to the serious nonlinear characteristics of the non-bonded flexible pipe, which makes it very difficult for us to simulate and analyze.In recent years, many scholars have studied and analyzed the unbonded flexible pipe on the basis of special assumptions and various simplifications. However, the data and conclusions obtained are often used in practical engineering.In addition, the foreign countries strictly keep secret the technology in this respect, and the domestic research starts relatively late, so the pipeline used in domestic offshore oil and gas exploitation is forced to be purchased from abroad at a high price, which seriously affects the energy strategy and the process of economic development of our country.Therefore, it is necessary to analyze and simulate the local mechanical properties of non-bonded flexible pipelines for the early realization of autonomous and mass production of flexible pipelines in China.In this paper, the main structure and characteristics of the unbonded flexible pipe are introduced, and the research status at home and abroad is studied and summarized in detail, and the theoretical formula model used in the calculation of the flexible pipeline is sorted out.The method theory of finite element analysis is also introduced.On this basis, referring to the international authoritative experimental sample tube parameters, the equivalent simplification method is used to simplify each structure layer, and the appropriate unit type is selected to simulate each layer structure by comparing and selecting the appropriate unit type.A three-dimensional finite element model is established by using the universal finite element software ANSYS and the loads applied to it are calculated and analyzed.Finally, the internationally recognized experimental data obtained from the experiments conducted by foreign institutions are compared with the results of theoretical formulas and finite element simulation analysis to verify the correctness of the modeling and draw relevant conclusions.It can be used for reference in engineering application.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95

【相似文献】