裂缝性低渗透油藏流-固耦合数值模拟

Based on the feature of low permeable fracture sand stone reservoir, the equivalent continuous model of fluid flow in the porous media. By experiment, the relationship of porosity, permeability and effective pressure was got. Using the porous flow theory and elasto-plastic theory, the author established the mathematical model of fluid-solid coupling flow in low permeability media. The model considered the effect of TPG (Threshold Pressure Gradient). Then numerical solution of the model was given. The solution was based on finite element method and finite different method. Simulation software was remodeled on black oil model and elasto-plastic FEM program. Using the software, the author simulated a low permeable reservoir. Contrasting to the result that calculated by oil black model, we found that the fluid-solid coupled effect is obvious.