Research On Numerical Simulation Of CO₂ Flooding In Strong Water Sensitive Reservoir

With the increase of CO₂ in Daqing oilfield flooding promotion efforts,old block tracking adjustment and development experience,the new block scheme optimization,put forward higher requirements on the numerical simulation,model design,PVT phase fitting,history matching precision requirements are higher,more complex optimization.In order to improve the development effect,improve the application technology of CO₂ flooding in Daqing oilfield,and realize the refinement and standardization of reservoir simulation technology of CO₂ drive,this research has been carried out.This paper studies the parameter setting method to improve the speed and accuracy of phase simulation.Through the conceptual model and typical block model,we study the influence factors of the simulation calculation index,and study the method of improving the simulation accuracy combined with the actual problems occurring in the field.The main achievements are as follows:?1?study the formation of a component of split and merge,the experimental data regression optimization and fast parameter adjustment method,the phase refinement and standard simulation;?2?permeability,oil density,reservoir heterogeneity,non effective thickness of suction,dip and the relative permeability curve,the solubility of CO₂ in water,the grid size,difference scheme and other factors to estimate the influence of quantization,formation parameter setting and correction method,lays a foundation for improving the simulation speed and accuracy;?3?refine CO₂ flooding fitting index,including pressure fitting,mining group fitting points,gas oil ratio fitting,comparative analysis of different miscible displacement distribution of underground attribute field,put forward new methods for distinguishing flooding front and mixed degree.Through the study,the simulation speed is improved,and the fine numerical simulation technical specification for CO₂ flooding is formed.The research results are applied to the actual blocks,which optimizes the development plan of CO₂ flooding.It provides technical support for the industrial promotion and application of CO₂ flooding in Daqing oilfield,and has broad application prospects for the effective development of ultra-low permeability oilfield.