Study on fluid transport in mixed inorganic nanopores
Based on the molecular dynamics simulation method,the mixed mineral model of illite-silica and shale oil model represented by octane are constructed.Fluid migration in the mixed inorganic nanopores is studied by analyzing the occurrence and flow characteristics of fluid in the slit.The results show that the slit surface adsorbs fluid,and the number and density of adsorbed layers increase first and then stabilize with the increase of the pores size.Fluid in large aperture is more easily driven.Negative slippage exists in the mixed inorganic nanopores,which can be converted into positive slippage by increasing the pressure gradient or temperature.The thickness of the non-flowing viscous layer at the boundary is reduced,which is conducive to the fluid flow in the nanopores.When oil-water two-phase flow occurs,water molecules are preferentially adsorbed on the wall compared to alkanes.When the water content is low,water membranes near the wall are observed.Water membranes at the wall weaken the interaction between alkanes on the wall.The thicker the water membranes are,the more obvious the shielding effect is.
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