基于分形理论油藏多孔介质输运特性研究

发布时间：2018-05-07 08:28

本文选题：油藏输运 + 多孔介质　；参考：《东北石油大学》2015年硕士论文

【摘要】：为了提高现有原油的采收率,了解油藏的地质特征,搞清油藏动态变化,对油田的后期开采变得越来越重要。地下油藏概况是通过油藏储集层的空间分布和地层微观孔隙结构,及流体输运特性参数来表征。分形理论的提出给石油工作者们带来了新的研究方法。由于油藏储层具有非均质性,地层不同部位多孔介质的孔隙结构尺度范围也不同,从微观到宏观都有可能具有分形特征,但是体现分形特征的维数却不一样,而且不同的尺度层级对油藏的影响区别很大,因此在表征宏观参数的计算中会存在尺度效应问题。已有文献中的渗流基本公式中将微观与宏观研究相结合来得到油藏流体的分布规律,但是没有考虑到单位尺度层级问题。本文对该公式重新推导,得到了输运特性参数的单位尺度转换系数,以用来在宏观参数计算与微观特征尺度的结合中能建立良好的桥梁,实现任意不同尺度层级间的转换,经验证该修正公式成立,得到的宏观特性参数结果更接近实测值。同时由验证过程分析油藏储层空间中产生的孔隙尺度效应。基于修正公式对某岩样进行计算,分析了储层岩石的微观孔隙特征参数对油藏宏观输运参数的影响,得出了输运参数流量及渗透率变化规律,与实际油藏的分布规律吻合。本文研究对如何在不同尺度的数据间相互转换,使公式的计算结果更精确,深入的研究油藏结构从而提高原油采收率,具有极其重要的意义。
[Abstract]:In order to improve the oil recovery, understand the geological characteristics of the reservoir and make clear the reservoir dynamic change, it becomes more and more important for the later production of the oil field. The general situation of underground reservoir is characterized by the spatial distribution of reservoir, the microscopic pore structure of formation, and the characteristic parameters of fluid transport. Fractal theory has brought new research methods to petroleum workers. Due to the heterogeneity of reservoir and the different pore structure scale range of porous media in different parts of formation, it is possible to have fractal characteristics from micro to macro, but the dimension of fractal characteristics is different. Moreover, the effect of different scale levels on the reservoir is very different, so there exists the scale effect problem in the calculation of representing macroscopic parameters. In the basic formula of percolation in the literature, the microscopic and macroscopic studies are combined to obtain the distribution law of reservoir fluid, but the problem of unit scale hierarchy is not taken into account. In this paper, the unit scale conversion coefficient of the transport characteristic parameters is derived again, which can be used to build a good bridge in the combination of macroscopic parameter calculation and microscopic characteristic scale, and to realize the conversion between any different scale levels. It is proved that the modified formula holds, and the result of macroscopic characteristic parameter is closer to the measured value. At the same time, the pore scale effect in reservoir space is analyzed by verification process. Based on the modified formula, the influence of microscopic pore characteristic parameters of reservoir rock on macroscopic transport parameters of reservoir is analyzed, and the flow rate and permeability change law of transportation parameters are obtained, which is consistent with the distribution law of actual reservoir. The study of this paper is of great significance to how to convert the data of different scales to each other, to make the formula more accurate, and to study the reservoir structure in depth to improve the oil recovery.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE31

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