海洋柔性管缆水下附属浮力装备的设计研究

发布时间：2019-04-24 13:31

【摘要】：海洋柔性立管是海洋油气资源开发中的主要装备之一,根据海况和安全需求的不同,立管在水中会呈现出各种线型,而这些线型的维持,都离不开浮力附件。浮力附件的种类很多,其中最常见、最经济的是分布式浮力模块,主要由外部的塑料保护层、内部的固体浮力材料以及连接结构组成。在海洋环境荷载和立管随波运动作用下,浮力模块与立管的连接处会产生不均匀接触,甚至发生相对滑动现象,造成连接的失效,这也是实际应用中最常见的失效模式,因此对连接结构的设计尤为重要。虽然分布式浮力模块的结构简单,但是这类附件的设计制造技术仍然被国外垄断,打破这种国内空白的现象,实现浮力装备国产化将会成为我国海洋油气资源开发的一大进步。本文首先调研总结了世界上通用的浮力装备的主要形式和分类,并详细介绍国内外对浮力装备的发展现状,通过研究在各种荷载下的失效模式,提出设计准则,并基于失效模式给出分布式浮力模块的整体结构、加工材料和连接性能的设计方法和研究路线。考虑到连接性能的重要性,提出理论与数值两种研究方法,并基于过盈连接建立详细的有限元模型,主要针对立管夹对管道的最大接触压力、最大等效应力和连接性能的影响,采用数值仿真方法对其进行正常运行状态与危险状态下的模拟工况分析,得到规律性结论,并给出最佳过盈量和接触区域长度的取值方法。最后以“863”国家项目为设计分析实例,对分布式浮力模块进行整体设计,得到满足立管要求的浮力模块主体与连接结构,并保证在恶劣海况下仍能保持正常工作状态。本论文的工作主要以国家“863”计划课题为依托进行开展,将对我国自主研发海洋柔性立管附件有着非常重要的意义。
[Abstract]:The marine flexible riser is one of the main equipments in the exploitation of offshore oil and gas resources. According to the different sea conditions and safety requirements, the riser presents various linetypes in the water, and the maintenance of these linetypes is inseparable from the buoyancy accessories. There are many kinds of buoyancy accessories, among which the most common and economical one is distributed buoyancy module, which mainly consists of outer plastic protective layer, internal solid buoyancy material and connection structure. Under the action of marine environmental load and vertical pipe following wave motion, the connection of buoyancy module and riser will produce non-uniform contact, even relative sliding phenomenon, resulting in the failure of connection, which is also the most common failure mode in practical application. Therefore, it is very important to design the connection structure. Although the structure of distributed buoyancy module is simple, the design and manufacture technology of this kind of accessories is still monopolized by foreign countries, breaking this phenomenon of domestic blank, realizing the localization of buoyancy equipment will be a great progress in the exploitation of offshore oil and gas resources in our country. In this paper, the main forms and classification of the universal buoyancy equipment in the world are investigated and summarized, and the development status of buoyancy equipment at home and abroad is introduced in detail, and the design criteria are put forward by studying the failure modes under various loads. Based on the failure mode, the whole structure of the distributed buoyancy module, the design method and research route of the machining material and connection performance are given. Considering the importance of connection performance, two methods of theoretical and numerical research are proposed, and a detailed finite element model based on interference connection is established, which is mainly aimed at the influence of riser clamp on the maximum contact pressure, maximum equivalent stress and joint performance of pipe. The numerical simulation method is used to analyze the simulated working conditions under the normal and dangerous conditions, and the regular conclusions are obtained, and the method of selecting the optimum excess amount and the length of the contact area is given. Finally, taking the "863" national project as an example, the whole design of the distributed buoyancy module is carried out, and the main body and the connecting structure of the buoyancy module which meet the requirements of riser are obtained, and the normal working state can be guaranteed under bad sea conditions. The work of this paper is mainly carried out on the basis of the "863" project, which will be of great significance to the independent research and development of marine flexible riser accessories in China.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P742

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