考虑酸蚀蚓孔和微裂缝的碳酸盐岩储层酸压井产能预测

发布时间：2018-07-28 20:46

【摘要】：碳酸盐岩储层通常含有分布不均的天然微裂缝,进行酸压改造时天然微裂缝会对酸液的分布产生一定影响。酸压过程中酸液在井底的压力高于地层破裂压力,压碎地层的同时还会与储层壁面矿物进行酸岩反应产生凹凸不平的刻蚀沟槽。酸液对酸压裂缝壁面的非均匀刻蚀决定了酸蚀蚓孔的生长发育情况,另一方面酸蚀蚓孔的扩展又会对酸液进一步向前流动产生重要影响。因此,在进行碳酸盐岩储层酸压井产能预测时考虑酸蚀蚓孔和微裂缝的影响是非常有必要的。本文从储层的实际物理流动及化学反应过程出发,结合相关统计学经验规律建立地质模型,并在此基础上进行裂缝扩展延伸模型及酸压裂缝壁面刻蚀模型研究,同时考虑酸蚀蚓孔和微裂缝对酸压过程的影响,最后进行酸压井的产能预测。此外,将整个产能预测模型编制为可实际运行的酸压软件,并结合实例井分析了酸压裂缝长度及宽度对酸压井产能预测的影响。论文主要研究情况如下:(1)考虑天然裂缝宏观上集群分布微观上随机分布的特点,结合储层物性参数的非均匀分布规律引入空间关联系数,建立地质物理模型。(2)建立裂缝扩展延伸模型,并在此基础上进行酸压裂缝壁面刻蚀形态模拟研究,结合现场实例井数据进行施工参数的优化设计。同时进一步分析了储层岩石层理对酸液在壁面刻蚀的影响。(3)着重考虑蚓孔及微裂缝在酸压中对酸液滤失及酸压裂缝延伸的影响,通过油水两相流动产能模型对酸压井产能作出预测分析。研究成果拓展了以往产能预测考虑因素的范围,对于提高碳酸盐岩酸压井产能预测的准确性、有效性及科学指导现场应用具有一定意义。
[Abstract]:Carbonate reservoirs usually contain uneven distribution of natural micro-fractures, the natural micro-fractures will have a certain impact on the distribution of acid solution when acid fracturing is carried out. The pressure of acid solution at bottom hole is higher than that of formation fracture in the process of acid fracturing. When crushing the formation, acid rock reaction with reservoir wall minerals will result in uneven etched grooves. The uneven etching of acid solution on the wall of acid fracturing determines the growth and development of acid wormhole, on the other hand, the expansion of acid wormhole will have an important effect on the further forward flow of acid solution. Therefore, it is necessary to consider the influence of acid wormhole and microfracture in predicting the productivity of acid well in carbonate reservoir. In this paper, based on the physical flow and chemical reaction process of the reservoir, the geological model is established based on the relevant statistical experience, and on this basis, the fracture extension model and the etching model of the acid-fracturing fracture wall are studied. At the same time, the effect of acid-etching wormhole and micro-fracture on the acid-fracturing process is considered. Finally, the productivity prediction of acid-fracturing well is carried out. In addition, the whole productivity prediction model is developed as a practical acid-fracturing software, and the influence of acid-fracturing fracture length and width on acid-fracturing productivity prediction is analyzed with an example well. The main research results are as follows: (1) considering the characteristics of random distribution in macroscopic cluster distribution of natural fractures, the spatial correlation coefficient is introduced in combination with the non-uniform distribution of reservoir physical parameters. The geological physical model is established. (2) the fracture extension model is established, and on the basis of this model, the simulation study of etching morphology of acid-fracturing fracture wall is carried out, and the optimization design of construction parameters is carried out based on the well data of field examples. At the same time, the influence of reservoir lithology on acid etching on the wall is analyzed. (3) the influence of vermis pore and micro-fracture on acid fluid filtration and acid fracturing extension in acid fracturing is emphatically considered. The production capacity of acid well is predicted by oil-water two-phase flow productivity model. The research results expand the range of factors considered in productivity prediction in the past, and have certain significance for improving the accuracy, effectiveness and scientific guidance of production prediction in carbonate acid well killing.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.2

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