新型天然气水合物保真筒保压特性研究

发布时间：2018-03-01 19:32

本文关键词： 深海水合物采样保真筒保压特性仿真优化　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济的发展和人民生活水平的提高,煤炭、石油等不可再生能源的消耗逐步增大,深海天然气水合物作为一种储量巨大的清洁能源成为世界应对能源危机的一个重要方向。我国现有的天然气水合物采样器由于海地质软硬、加工成本、船载能力等因素,可取芯长度有限,无法满足南海的勘探需要。本文所提的新型采样器以及设计的专用的气垫式保真筒可望在满足保压要求的前提下,实现深海天然气水合物的大深度取芯。本文共分七章进行介绍：第一章主要介绍了天然气水合物的资源背景和国内外深海天然气水合物采样设备的发展现状,并在此基础上提出了本文的研究意义、研究目的和研究的内容; 第二章提出一种新型的天然气水合物钻机,并对钻机各部分的组成结构进行介绍描述,同时对该设备实现深海天然气水合物的大深度保真取样的工作原理进行了说明；第三章介绍了本文研究的重点,新型天然气水合物钻机的专用保真设备——气垫式保真筒,详细描述了气垫式保真筒的保压原理和筒体各部分结构的尺寸设计; 第四章针对气垫式保真筒的保压性能进行了理论研究和实验验证,其中理论研究主要包括样品自身体积变化对保真筒保压性能的影响分析,和气垫式保真筒采样终了压降模型的建立及仿真。模拟采样实况进行试验验证,结果表明理论分析具有准确性；第五章对影响气垫式保真筒保压性能的主要工作参数：预充压力Ppre,结构参数：气腔长度hg、筒体长度h、筒体内径d、和筒体壁厚δ进行仿真分析,由分析结果知,Ppre、hg、δ与采样终了压降值负相关,且对其影响较大,h和di与采样终了压降值正相关,对其影响较小；第六章以气垫式保真筒的效率质量比的极大化和采样终了筒内压降的极小化作为优化目标,对气垫式保真筒的结构参数和工作参数进行优化,进行参数优化后的气垫式保真筒效率质量比较初始设计提高12.9%,同时实现完全保压,总体来说,优化效果明显；第七章总结全文,阐述本文的研究成果,提出下一步的研究方向。
[Abstract]:With the development of economy and the improvement of people's living standard, the consumption of non-renewable energy such as coal, petroleum and so on is gradually increasing. As a clean energy with huge reserves, deep-sea gas hydrate has become an important direction in the world to deal with the energy crisis. The existing gas hydrate sampler in China is due to factors such as hard and soft marine geology, processing cost, ship-borne capacity, and so on. The new sampler proposed in this paper and the special air cushion type true barrel proposed in this paper are expected to realize the deep core extraction of deep-sea gas hydrate under the condition of keeping pressure. This paper is divided into seven chapters:. The first chapter mainly introduces the natural gas hydrate resource background and the domestic and foreign deep-sea gas hydrate sampling equipment development status, and on this basis proposed the research significance, research purpose and research content; In the second chapter, a new type of gas hydrate drilling rig is proposed, and the structure of each part of the rig is described. At the same time, the working principle of the equipment to realize the deep depth fidelity sampling of deep sea gas hydrate is explained. In the third chapter, the emphasis of this paper is introduced, the special fidelity equipment of the new gas hydrate drilling machine, the air-cushion fidelity cylinder, is described in detail, and the principle of keeping pressure and the dimension design of each part of the cylinder are described in detail. In chapter 4th, the theoretical and experimental study on the pressure retention performance of air-cushion fidelity tube is carried out. The theoretical study mainly includes the analysis of the influence of the volume change of the sample on the pressure retention performance of the vacuum tube. The model of end-sampling pressure drop of air-cushion fidelity cylinder is established and simulated. The experimental results show that the theoretical analysis is accurate. In chapter 5th, the main working parameters which affect the pressure retention performance of air-cushion fidelity cylinder are analyzed by simulation, such as pressure-filled pressure Ppree, structure parameters: gas chamber length HG, cylinder length h, cylinder inner diameter d, and cylinder wall thickness 未. The results show that Pprehg, 未 has a negative correlation with the pressure drop at the end of sampling, and has a great influence on it, and has a positive correlation with the value of the pressure drop at the end of the sampling, but has a little effect on the pressure drop at the end of the sampling. In chapter 6th, the structure parameters and working parameters of air-cushion fidelity tube are optimized with the aim of maximizing the ratio of efficiency and mass and minimizing the pressure drop in the end of the sampling tube. Compared with the initial design, the efficiency and quality of the air-cushion fidelity tube after parameter optimization are improved by 12.9. at the same time, the pressure preservation is completely realized. In general, the optimization effect is obvious. Chapter 7th summarizes the full text, expounds the research results of this paper, and puts forward the next research direction.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P634.3;P742

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