基于分形理论的碳酸盐岩基质酸化产能研究

发布时间：2018-10-05 14:03

【摘要】：基质酸化作为对碳酸盐岩储层的一种重要增产措施,近年来已经得到了广泛的应用。本文针对碳酸盐岩基质酸化的产能研究,在前人的工作基础上,做出了较为深入的研究。重点工作如下：大量调研了国内外众多专家学者对酸蚀蚓孔与分形理论的研究进展,系统分析了酸蚀蚓孔的影响因素,生长模型,模型优缺点与适用范围,客观叙述了分形理论的起源,发展及现状,确立了本文拟解决的问题：探究不同分形维数对酸化后的蚓孔地层的渗透率,表皮系数以及产能的影响。随后,根据酸蚀蚓孔的形成机理与生长特征,分析了酸岩反应原理,建立了酸蚀蚓孔生长模型。分析并讨论了酸蚀蚓孔长度与半径的变化及其影响因素。可以看出大排量,低浓度以及加入了降滤剂和胶凝剂的酸液体系可以使得蚓孔生长更长,进而提高了基质酸化的有效性。结合分形理论,建立了酸蚀蚓孔分形渗透率模型,经过证实,可以较好地应用于实验条件下的酸岩反应。分析并讨论了影响蚓孔分形渗透率变化的影响因素,可以看出,迂曲度分形维数越大,渗透率越小,分形维数越大,渗透率越大；地层孔隙度越大,渗透率越大。建立了考虑蚓孔压降的表皮系数模型,将分形维数引入到表皮模型中,对比分析了前后两种表皮系数模型在计算结果上的不同,同时定性分析了迂曲度分形维数,分形维数及地层孔隙度对表皮系数的影响。最后,根据上述一整套模型与算法,进行了对直井稳态产能的计算,研究表明,酸化后蚓孔的迂曲度分形维数越大,产能越低,分形维数越大,产能越大,地层孔隙度越大,产能越小。碳酸盐岩基质酸化是一个涉及了多门学科的复杂课题,在很多问题上还需要进行进一步的探讨与分析。
[Abstract]:As an important stimulation measure for carbonate reservoir, matrix acidification has been widely used in recent years. In this paper, the productivity of carbonate matrix acidification is studied. The main work is as follows: a large number of domestic and foreign experts and scholars on the acid wormhole and fractal theory research progress, systematic analysis of the acid wormhole influence factors, growth model, model advantages and disadvantages and applicable scope, The origin, development and present situation of fractal theory are described objectively, and the problems to be solved in this paper are established: the influence of different fractal dimensions on the permeability, epidermal coefficient and productivity of acidified wormhole formation is studied. Then, according to the formation mechanism and growth characteristics of acid wormhole, the reaction principle of acid rock is analyzed, and the growth model of acid wormhole is established. The variation of the length and radius of the wormhole and its influencing factors were analyzed and discussed. It can be seen that the large discharge, low concentration and the addition of filter reducer and gelling agent can make the pore growth longer, and improve the effectiveness of substrate acidification. Based on fractal theory, a fractal permeability model of acid wormhole is established. It is proved that the model can be applied to the acid rock reaction under experimental conditions. The influence factors on the fractal permeability of wormhole are analyzed and discussed. It can be seen that the larger the fractal dimension of detour, the smaller the permeability, the larger the fractal dimension, the greater the permeability, and the greater the porosity, the greater the permeability. An epidermal coefficient model considering the pressure drop of the wormhole is established. The fractal dimension is introduced into the epidermis model. The difference between the results of the two epidermal coefficient models before and after is compared and the fractal dimension of the roundabout degree is qualitatively analyzed. The influence of fractal dimension and formation porosity on epidermal coefficient. Finally, according to the above models and algorithms, the steady-state productivity of the vertical well is calculated. The results show that the greater the fractal dimension of the wormhole after acidification, the lower the productivity, the larger the fractal dimension, the greater the productivity and the greater the porosity of the formation. The smaller the capacity. Carbonate matrix acidification is a complex subject involving many disciplines, and many problems need to be further discussed and analyzed.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.2

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