Study Of Streamline Numerical Simulation Of Non-Darcy Flow In Low Permeability Reservoir

Low permeability reservoir has characteristics of compactness,strong heterogeneity,fierce low permeability,low seepage velocity and so on,and the conventional numerical simulation technology cannot meet our needs.On the other hand,streamline numerical simulation and analysis technology to develop low permeability oil reservoir is needed.So studies on streamline numerical simulation of non-Darcy flow and low permeability oil reservoir will make great sense.In consideration of characteristics of low permeability reservoir and takes the equations of low-velocity non-Darcy flow with start-up pressure gradient into account,the streamline numerical simulation model with start-up pressure gradient were deduced.and conform the corresponding numerical calculating method.The concrete research contents and achievement are:1.Deduction of the streamline model of low-velocity-non-Darcy flow.Through research the percolation mechanism of low-velocity non-Darcy flow,then the article study on numerical calculate method for the streamline mathematical model which have been found,the governing equations of low-velocity-non-Darcy flow were deduced,and take streamline method into low-velocity non-Darcy flow equation,then streamline equation with start-up pressure gradient was deduced.Including the foundation and solving of oil-water of two-phase and two-dimensional reservoir seepage mathematics model,streamline tracking method of reservoir,and the deduced of streamline saturation equation.2.Researching the numerical method of low-velocity-non-Darcy streamline model.This part include the calculate of pressure field,velocity field,streamline propagation time,Pollock streamline tracing,node parameters of flow line,saturation equation of flow line with operator splitting,the recalculated of grid parameters of flow line update and test of simulating with actual data.3.Programming of the streamline numerical simulation software.Software includes data input,well control settings,model calculate,and the view of streamline,result output and so on.4.In the end,the streamline distributed belong inject and produce well and production characteristics under different start-up pressure gradient was given through calculating by streamline numerical simulation software with the chang 8 reservoir data,the content includes streamline numerical simulation with start-up pressure gradient does not consider,with dead grid in the reservoir,with start-up pressure gradient in consider.