【摘要】 针对岩石物理试验中出现的孔隙流体(油水)两相分离现象,应用格子Boltzmann(LB)方法中的两相不相溶流体的伪势模型,对油水界面动力学行为进行微观数值模拟,分析多孔介质中两相流动的微观特征,并从理论上给出两相不相溶流体界面张力因子Gf值的确定方法。模拟由于表面张力造成的油水两相分离现象,在此基础上研究润湿性对真实储层岩心孔隙流体两相分离的影响,并实现全程动态可视化。研究表明,用LB方法进行储层岩石油水两相分离简便易行、形象直观,是研究流体分离规律和特点的重要评价方法。更多还原

【Abstract】 The dynamic behavior of oil-water surface that leads to the oil-water two-phase separation phenomenon in rock physics experiments was numerically simulated by using potential model of two-phase immiscible fluids in lattice Boltzmann(LB) method.The microscopic feature of two-phase flow in porous medium was analyzed,and the interfacial tension factor Gf of two-phase immiscible fluid was theoretically determined.The oil-water two-phase separation caused by interfacial tension was simulated successfully.Based on this,the influence of wettability on two-phase separation of pore fluid in real cores of reservoir rock was investigated,and global dynamic visualizations were realized.LB method is simple and visual in image to take oil-water two-phase segregation in reservoir rocks.It is an important evaluation method to research the behavior and character of fluid separation.更多还原