天然气水合物藏注热开采热前缘研究

发布时间：2018-06-21 21:11

本文选题：天然气水合物 + 热前缘　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：近年来天然气水合物藏被视为是新型的、清洁的、储量非常大的可替代能源,尤其日本在南海海槽地层中成功开采了天然气水合物藏以来,水合物藏的开发受到各国政府和科研机构的高度重视。注热开采水合物藏被认为是有效且可行的方法之一,但明显缺点是热损失大、热量利用率不高,因此,水合物藏注热开采的热前缘移动规律是亟需研究的关键课题。热前缘的理论研究模型按侧重点不同可分为三类:热传导模型、对流传热模型以及能量守恒模型。各模型考虑的侧重点不同,数学模型的构成也不同。从模型考虑因素以及数学模型的完整性上看,Selim模型和Macguire模型、前缘驱替模型是比较全面的模型。热前缘的实验研究可分为一维填砂管实验研究和二维平板模型实验研究。一维实验结果表明,在注热开采水合物藏过程中,热前缘的位置与时间呈近似直线型关系,二维实验结果显示热前缘的位置与时间呈抛物线型关系。地质因素与注热因素同时影响着热前缘的移动,在实验条件下,水合物藏的饱和度、渗透率越高,热前缘移动越慢;水合物藏的初始温度、注热过程中的温度、速度、盐度以及注热量越高,热前缘移动越快,但并不是线性递增关系,说明存在最佳注热条件,在该条件下,热前缘的移动速度最优。对比热前缘的理论计算结果和实验结果发现,一维热前缘理论模型的计算结果与实验结果相差较大,需要提出改进的一维热前缘理论计算模型,影响因素的敏感性规律一致;二维热前缘理论模型的计算结果与实验结果较相符的是前缘驱替模型,在影响因素的敏感性分析上,前缘驱替模型也与实验结果一致,推荐作为二维热前缘计算理想的理论模型。
[Abstract]:In recent years, natural gas hydrate reservoirs have been regarded as new, clean, and very large reserves of alternative energy, especially since Japan successfully exploited natural gas hydrate reservoirs in the South China Sea trough formation. The development of hydrate reservoir is highly valued by governments and scientific research institutions. The exploitation of hydrate reservoir by heat injection is considered as one of the effective and feasible methods, but the obvious shortcoming is that the heat loss is large and the heat utilization ratio is not high. Therefore, the heat front moving law of hydrate reservoir heat injection mining is a key subject that needs to be studied urgently. The theoretical study model of thermal front can be divided into three types according to the different emphases: heat conduction model, convection heat transfer model and energy conservation model. The emphasis of each model is different, and the composition of mathematical model is also different. Considering the factors of the model and the integrality of the mathematical model, Selim model and Macguire model are considered. The leading edge displacement model is a more comprehensive model. The experimental study of hot front can be divided into one-dimensional sand pipe experiment and two-dimensional plate model. The one-dimensional experimental results show that the position and time of the thermal front are approximately linear in the process of gas hydrate reservoir exploitation by injecting heat, and the two dimensional experimental results show that the position and time of the thermal front are parabolic. Geological factors and heat injection factors affect the movement of thermal front at the same time. Under experimental conditions, the higher the saturation and permeability of hydrate reservoir, the slower the movement of thermal front, the initial temperature of hydrate reservoir, the temperature and velocity of heat injection process, The higher the salinity and the heat injection, the faster the moving of the thermal front, but not the linear increasing relationship, which indicates that there are the best conditions of heat injection, under which the moving velocity of the thermal front is the best. Compared with the theoretical and experimental results of the thermal front, it is found that the calculation results of the one-dimensional thermal front theoretical model are quite different from the experimental results, and an improved one-dimensional thermal front theoretical calculation model needs to be proposed, and the sensitivity of the influencing factors is consistent. The calculated results of the two-dimensional thermal front theoretical model are in good agreement with the experimental results. In the sensitivity analysis of the influencing factors, the front-edge displacement model is also consistent with the experimental results. It is recommended as an ideal theoretical model for two-dimensional thermal front calculation.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE377

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