基于格子Boltzmann方法的油水两相流动规律

发布时间：2018-01-07 22:23

本文关键词：基于格子Boltzmann方法的油水两相流动规律　出处：《断块油气田》2016年03期 　论文类型：期刊论文

【摘要】：文中采用随机生长四参数生成法,对储层岩石的二维微观孔隙结构进行了重构。基于格子Boltzmann方法,从孔隙尺度模拟了多孔介质中的油水两相流动,对不同驱替时刻多孔介质内流体分布进行了模拟,得到了油水两相相对渗透率曲线和油水压汞曲线,并分析了π准数(界面张力与压力梯度比值)对油水两相流动的影响。研究结果表明:润湿相(水相)沿着大孔道的中轴部位驱替非润湿相(原油),在小孔道残余部分原油,而随着水驱过程的继续进行,小孔道中的油也逐渐被驱替出来;随着含水饱和度的增加,油相相对渗透率逐渐下降,水相相对渗透率逐渐增加。当π准数减小时,油水两相相对渗透率值均增大,其中油相相对渗透率值增大幅度较水相相对渗透率值增大幅度更大,可通过提高驱动压力梯度或者降低界面张力提高采收率。
[Abstract]:In this paper, the two-dimensional pore structure of reservoir rock is reconstructed by random growth four-parameter generation method based on lattice Boltzmann method. The oil-water two-phase flow in porous media is simulated from pore scale, and the fluid distribution in porous media at different displacement times is simulated. The relative permeability curve and oil-water pressure mercury curve of oil-water two-phase are obtained. The effect of 蟺 -number (the ratio of interfacial tension to pressure gradient) on the oil-water two-phase flow is analyzed. The results show that the wetting phase (water phase) displaces the non-wetting phase (crude oil) along the central axis of the macroporous channel. The residual part of the crude oil in the pore channel, and with the continuation of the water drive process, the oil in the pore channel is gradually displaced out; With the increase of water saturation, the relative permeability of oil phase decreases gradually, and the relative permeability of water phase increases gradually. The increase of relative permeability of oil phase is larger than that of water phase, and the oil recovery can be improved by increasing the driving pressure gradient or decreasing the interfacial tension.
【作者单位】：中国石油大学(北京)石油工程教育部重点实验室;
【基金】：国家自然科学基金项目“页岩气藏开采基础研究”(51234007)
【分类号】：TE312
【正文快照】： 0引言由于多孔介质孔隙结构复杂,连通性差,常规的电镜和CT扫描获得的岩心图像难以用于微观流动模拟,而通过数值重建的方法,可以获取连通性较好的数字岩心[1]。近年来,随着图像处理技术和统计学的发展,多孔介质微观结构重构技术越来越受到重视。王晨晨等[2]基于微观CT扫描图像

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