注水开采致密油体积压裂数值模拟研究

发布时间：2018-07-10 01:17

本文选题：致密油 + 体积压裂　；参考：《东北石油大学》2015年硕士论文

【摘要】：近些年来,致密油藏的开发越来越受到人们的重视,且分段多簇压裂技术具有良好的发展前景。对国内外已有的体积压裂研究成果综合分析可知,有限差分方法是目前研究油藏渗流问题的主要数值分析方法,但是也有很大的局限性,尤其对于不规则的几何形状和特殊边界条件问题。作为一种有效的数值分析方法,有限元法在人工裂缝的模拟方面的优势就体现出来了,因此近年来越来越多的学者把有限元法应用在人工压裂井问题上。但是针对体积压裂数值模拟问题,特别是对体积压裂后产生的复杂裂缝数值模拟方面的研究还不够深入,需要进行深入研究。本文建立了油水两相渗流有限元方程,编制了适用于体积压裂改造后复杂裂缝系统的油藏数值模拟器。为了便于对体积压裂后复杂裂缝进行数值模拟研究,将改造后的复杂裂缝处理成主缝和高渗透改造区域两个部分,改造区域的渗透率通过对单井历史拟合确定。在此基础上研究了启动压力梯度对体积压裂产能的影响;针对七点法井网,研究了段数对体积压裂效果的影响,对端部裂缝半长和整体裂缝半长进行了优化,并研究了改造体积对体积压裂效果的影响规律。针对五点法井网,研究了段数对体积压裂效果的影响。
[Abstract]:In recent years, more and more attention has been paid to the development of dense reservoirs, and segmented multi-cluster fracturing technology has a good prospect. Based on the comprehensive analysis of the existing research results of volume fracturing at home and abroad, it can be seen that the finite difference method is the main numerical analysis method for reservoir percolation problem, but it also has great limitations. Especially for irregular geometry and special boundary conditions. As an effective numerical analysis method, the advantage of finite element method in artificial fracture simulation has been demonstrated. Therefore, in recent years, more and more scholars have applied finite element method to artificial fracturing wells. However, the research on the numerical simulation of volume fracturing, especially on the complex fracture produced by volume fracturing, is not deep enough, so it needs to be deeply studied. In this paper, the finite element equation of oil-water two-phase percolation is established, and the reservoir numerical simulator suitable for complex fracture system after volume fracturing is developed. In order to facilitate the numerical simulation of complex fractures after volume fracturing, the reconstructed complex fractures are treated into two parts: the main fracture and the high permeability area. The permeability of the reconstructed area is determined by fitting the history of the single well. On this basis, the effect of starting pressure gradient on volume fracturing productivity is studied, and the effect of segment number on volume fracturing effect is studied for seven-point well pattern, and the end fracture half length and integral fracture half length are optimized. The effect of revamping volume on the effect of volume fracturing is also studied. The effect of section number on volume fracturing effect is studied for five-point well pattern.
【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】：TE357

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