Based on the Euler-Euler-Lagrangian framework, the Euler-Euler two-fluid model coupled with population balance model (PBM) and the Discrete Phase Model (DPM) model were used to simulate the gas-liquid-solid three phase dynamic behavior in the laboratory bubble column. The non-Newtonian properties of the liquid phase was considered in the numerical simulation, and the cases with different numerical models were discussed. It is found that the peak value velocity of liquid phase decrease due to the solid phase. The gas holdup remains almost the same in different cases with or without solid phase. There is no obvious periodic oscillation plume in non-Newtonian fluid. The interaction between solid and liquid has an effect on the flow field, gas distribution and viscosity distribution. The flow field calculated by CFD+PBM+DPM model forms three obvious vortices, while the symmetrical vortex is formed by CFD+PBM+DPM model, which is located on both sides of the bubble column. The distribution of dynamic viscosity simulated by different numerical models is basically the same in vary cases.
Understanding the two-phase displacement behaviors of oil and water in porous media under different reservoir development modes for enhanced oil recovery is essential. In this paper, the influence of development measures, such as increasing the injection rate, changing the inlet/outlet position, increasing the water viscosity, and reducing the surface tension coefficient, on oil–water dynamic behaviors was studied using a numerical simulation based on the study of the formation of a high-water-cut channel by water flooding at different injection rates. The results show that blockage and restart occur during displacement in the pore–throat channel and during staggered displacement in different pore channels. With an increase in the injection rate, the recovery increases first and then decreases. All the different development measures can increase the swept area and recovery factor. The recovery factor increases significantly by reducing the surface tension coefficient at medium/high injection rates (≥0.01 m/s) and by increasing the viscosity of the water at low injection rates (<0.01 m/s). The numerical simulation study preliminarily revealed the influence of different development measures on displacement behaviors in the pore model. It thus provides theoretical support for understanding the law of oil and water movement in reservoirs.
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