深海铺设油气管道的非线性受力分析

发布时间：2018-03-28 03:19

本文选题：管道铺设　切入点：S-Lay　出处：《华南理工大学》2015年硕士论文

【摘要】：随着地球陆地能源的日益衰竭,海洋油气资源愈来愈受到世界各国的重视。海底管道是海洋油气资源开发、运输系统中的一个至关重要的部分,因此被石化行业称为油气资源开发的生命线。随着我国海洋油气资源的进一步的开发利用,海底输运管道的需要量将会不断增大。由于海况复杂多变,海底管道在铺设的过程中同时受到弯矩、张力、海流力和静水压力的共同作用,其结构安全性受到巨大的挑战,因此开展深海管道铺设过程中的力学状态研究显得尤为重要。本文利用杆的大变形理论建立了管道的非线性控制微分方程,进而利用奇异摄动理论对S-Lay铺管法以及J-Lay铺管法的管道构型和受力状态进行了系统的研究,并得到了奇异摄动的理论解。为了证明理论解的正确性,本文利用有限元法对管道铺设过程进行了有限元分析,结果表明,有限元解和奇异摄动解吻合较好。同时,在理论研究的基础上,利用奇异摄动分析程序对S-Lay和J-Lay进行铺管参数敏感性分析,概况了不同工况下管道张紧力、海水深度以及海流力的变化对管线构型和受力状态的影响,提出了深海管道铺设过程中的指导性建议,为深海管道铺设作业提供了理论参考。最后,本文联合Delphi语言和MATLAB软件开发了海底管道铺设软件,该软件界面友好,计算快速,可以方便快捷地进行铺管设计。本论文的主要研究工作可以概况为以下几个方面:(1)系统介绍了国内外海底管道铺设的背景和意义,特别详细介绍了S-Lay铺管和J-Lay铺管的特点、受力性能以及国内外相关的研究成果;(2)本文在考虑了海流荷载以及管道截面的Brazier效应的基础上,利用杆的大变形理论得到了海底管道铺设过程中的非线性控制微分方程,并利用奇异摄动理论得到了管道构型的近似理论解,为管道铺设提供了理论上的依据;(3)采用有限元方法对深海管道铺设过程进行了数值仿真,通过有限元解和奇异摄动解的对比,验证本文内容的正确性和合理性;(4)运用奇异摄动理论近似解开发了计算分析软件,为铺管设计提供了一种方便快捷的途径;同时运用该程序分别对S-Lay铺管法和J-Lay铺管法进行了相关参数的敏感性分析。
[Abstract]:With the increasing depletion of terrestrial energy sources, offshore oil and gas resources have been paid more and more attention in the world. Submarine pipeline is an important part of marine oil and gas resources development and transportation system. Therefore, the petrochemical industry calls it the lifeline of oil and gas resources development. With the further development and utilization of offshore oil and gas resources in China, the requirements of submarine transportation pipelines will continue to increase. At the same time, the submarine pipeline is subjected to the joint action of bending moment, tension, sea current force and hydrostatic pressure, and its structural safety is greatly challenged. Therefore, it is very important to study the mechanical state in the course of deep sea pipeline laying. In this paper, the nonlinear control differential equation of pipeline is established by using the theory of large deformation of rod. Furthermore, the configuration and stress state of S-Lay and J-Lay pipe laying methods are systematically studied by using singular perturbation theory, and the theoretical solutions of singular perturbation are obtained to prove the correctness of the theoretical solutions. In this paper, the finite element method is used to analyze the pipeline laying process. The results show that the finite element solution is in good agreement with the singularly perturbed solution. The sensitivity analysis of pipe laying parameters for S-Lay and J-Lay was carried out by using singular perturbation analysis program. The effects of pipeline tensioning force, sea water depth and sea current force on the configuration and stress state of pipeline under different working conditions were summarized. The guiding suggestions in the course of deep sea pipeline laying are put forward, which provides a theoretical reference for the deep sea pipeline laying operation. Finally, this paper combines Delphi language and MATLAB software to develop the submarine pipeline laying software, which has friendly interface and quick calculation. The main research work of this paper can be summarized as follows: 1) the background and significance of submarine pipeline laying at home and abroad are introduced, especially the characteristics of S-Lay and J-Lay laying are introduced in detail. Based on the consideration of the current load and the Brazier effect of the pipeline section, the nonlinear control differential equations in the laying process of the submarine pipeline are obtained by using the large deformation theory of the rod. The approximate theoretical solution of pipeline configuration is obtained by using singular perturbation theory, which provides a theoretical basis for pipeline laying. By comparing the finite element solution with the singular perturbation solution, the correctness and rationality of this paper are verified. (4) the calculation and analysis software is developed by using the approximate solution of the singular perturbation theory, which provides a convenient and quick way for the pipe laying design. At the same time, the sensitivity of the related parameters of S-Lay method and J-Lay method are analyzed by using this program.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE973.92

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