Two-phase flow of emulsion flooding and its influencing factors in porous media
The process and mechanism of emulsion flooding is the basis for the development of emulsion flooding technology.A microfluidic visualization system was established to explore the two-phase flow characteristics of emulsion flooding and its influencing factors in porous media.The results show that the displacement mode of water and surfactant is viscous fingering,and the emulsion flooding is accompanied by droplets plugging,which can effectively inhibit viscous fingering,enhance interfacial stability and improve the displacement efficiency.The influences of capillary number,viscosity ratio and droplet to pore size ratio on the emulsion flooding were explored,and by establishing the distribution phase diagram of emulsion displacement mode with different viscosity ratio and capillary number,the transformation boundaries of stable displacement and viscous fingering of nanoparticle surfactants displacement in porous media is obtained.It is proved that emulsion can substantially increase the critical capillary number and viscosity ratio required for viscous fingering to occur,and effectively improve the spread efficiency and displacement efficiency,which provides a theoretical basis for the use of emulsion in actual crude oil extraction.
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