【作者】 宋艳波；

【导师】 邓宏文； 李治平；

【作者基本信息】 中国地质大学（北京） ， 矿产普查与勘探， 2005， 博士

【摘要】 近年来,我国发现了大量的低孔低渗透气田,如何科学合理开发这类气田是目前急待解决的课题,而气田的渗流机理又是解决气田开发的关键。为此,本文根据我国低渗气藏的特点,运用室内实验和理论研究相结合的方法,对高含束缚水的低渗气藏渗流机理进行了深入的研究,将岩石力学、渗流力学、气藏工程、气藏数值模拟等多学科相结合,将非达西渗流、介质的变形和束缚水的变化作为一个整体来研究,突破传统上各种因素相分离的研究方法,找到了含束缚水的低渗透变形介质气藏的渗流机理,建立了相应的数学模型并求解。并以苏里格气田为例进行应用研究,为高效开发低渗透变形介质气藏提供更科学的理论指导。本文首先设计低渗透率气藏岩石的变形实验,根据岩石变形的特点做了相应的实验:即岩石孔隙度、渗透率随围压和孔压的变化关系;测试不同束缚水饱和度下的岩石的变形。其次,从理论上分析了低渗透气藏储层岩石变形机理、建立了岩石随应力变化的数学模型,探讨了影响岩石变形的因素,研究了束缚水在岩石压缩变形影响下的变化规律与束缚水临界值问题,建立了考虑束缚水的影响变形数学模型,第三,本文将渗流力学和弹塑性力学相结合,首次建立了考虑束缚水影响的低渗透气藏岩石变形与气藏渗流的流固耦合渗流数学模型并研究了求解;最后,本文将上述研究成果运用于长庆苏里格气田气井生产中的井眼周围渗透率变化特性,生产过程中, 井眼周围渗透率的分布情况,产能试井资料异常的机理等研究中,得出了许多新的认识,为低渗透气田的科学开发和动态分析提供了基础。更多还原

【Abstract】 In these years, amount of gas fields with low porosity and permeability of our country are discovered, how to develop these kinds of fields are the very important things that must to be solved, and the key to develop these gas fields is the mechanism of fluid flow through the porous medium. So, according to the real situation of low permeability reservoirs in China, the percolation mechanisms for low permeability reservoir with irreducible water was studied deeply based on the lab results and theoretical investigation, in this paper, by combing rock mechanics with fluid flow mechanics, reservoir engineering and reservoir numerical simulation, considering non-Darcy flow, media deformation and the movement of irreducible water as the integer, breakthrough the research methods of separating all sorts of factors, then, the percolation mechanisms for low permeability reservoir with irreducible water was found out, and the corresponding mathematical model was set up solved. The SuLiGe gas field was researched as the example of applied research, to present the more scientific theory direction for developing the low permeability deformation gas reservoir with high efficiency. The first, the rock deformation experiment was designed for the low permeability deformation gas reservoir. On the basic of deformation experiment, the characteristics of the low permeability gas reservoir deformation were researched. The corresponding experiments presented the data of the porosity, permeability diversification with the confining pressure or the pore-pressure and the rock deformation instance with various irreducible water saturations. The second, the rock deformation mechanism, the influencing factor on deformation, the law of the low permeability gas reservoir rock, the law of irreducible water change with the rock deformation and the critical value of irreducible water were all analyzed. The corresponding mathematical model was set up. The third, the complete set of model on low permeability gas reservoir with irreducible water numerical simulation with the coupling of the fluids and reservoir deformation was set up, by the method of combining the plasto-elasticity and fluid mechanics in porous medium, for the first time, and the solution was researched. This is different from the bygone model which can not describe the gas reservoir definitely, for not considering the infection of irreducible water during the reservoir was developed. The last, the research findings were exercised in SuLiGe gas field practice research, such as the characteristic of permeability variation around gas well-bore, the distribution of permeability around gas well-bore, the mechanism of the abnormity for deliverability testing data, and so on. Many new realizations were gotten out, which is the basic of the science development of low permeability gas reservoir and the dynamic analysis.更多还原