The numerical modeling of oil displacement by nanofluid based on three-dimensional micromodel of cores with different permeability was carried out by the volume of fluid (VOF) method with experimentally measured values of interfacial tension, contact angle and viscosity. Water-based suspensions of SiO₂ nanoparticles with a concentration of 0–1% and different particle sizes were considered to study the effect of concentration and size of nanoparticles, displacement fluid flow rate, oil viscosity and core permeability on the efficiency of oil displacement by nanofluid. The oil recovery factor (ORF) increases with the increase of mass fraction of nanoparticles. An increase in nanoparticles' concentration to 0.5% allows an increase in ORF by about 19% compared to water flooding. The ORF increases with the decrease of nanoparticle size, and declines with the increase of displacing rate. It has been shown that the use of nanosuspensions for enhanced oil recovery is most effective for low-permeable reservoirs with highly viscous oil in injection modes with capillary number close to the immobilization threshold, and the magnitude of oil recovery enhancement decreases with the increase of displacement speed. The higher the oil viscosity, the lower the reservoir rock permeability, the higher the ORF improved by nanofluids will be.

基于不同渗透率岩心三维微观模型的纳米流体驱油数值模拟，采用流体体积法（VOF），通过实验测得的界面张力、接触角和粘度值进行数值模拟。SiO _{2 的}水基悬浮液考虑了浓度为 0-1% 和不同粒径的纳米颗粒，研究纳米颗粒的浓度和尺寸、驱替液流速、石油粘度和岩心渗透率对纳米流体驱油效率的影响。采收率（ORF）随着纳米颗粒质量分数的增加而增加。与水驱相比，将纳米颗粒的浓度增加到 0.5% 可使 ORF 增加约 19%。ORF随着纳米颗粒尺寸的减小而增大，随着位移速率的增大而减小。已经表明，在毛细管数接近固定阈值的注入模式下，使用纳米悬浮液提高石油采收率对于具有高粘性油的低渗透油藏最有效，采收率提高幅度随着驱替速度的增加而减小。石油粘度越高，储层岩石渗透率越低，纳米流体改善的ORF越高。