Research On Water Invasion Law And Thermal Recovery Optimization Of Heavy Oil Reservoir With Edge And Bottom Water (Block Jin91)

The pressure of heavy oil reservoirs with edge and bottom water drops rapidly in the process of steam stimulation.Water invasion phenomenon is obvious.Stimulation effect becomes poor after water invasion,development way need to be converted.This paper evaluates development effect in the process of steam stimulation using the method of reservoir engineering,numerical simulation and other methods.The study bases on the existing geological knowledge and characteristics of the heavy oil reservoirs with edge and bottom water.Therefore,studying on thermal recovery methods optimization of later stage of steam stimulation is important for replacing development scheme and enhancing oil recovery.Based on the background of block Jin 91,the study obtains the following results:(1)Block Jin 91 is a layered heavy oil reservoirs with edge and bottom water.With a large-scale sand body,it is a high property and permeability reservoir.(2)Reservoir development effect evaluation.With the reservoir engineering method,the study analyzes the reservoir production performance characteristics and the reason that reservoir pressure and water invasion velocity changing with each other.(3)Water invasion law study.The study determines the type of water invasion and gets the distribution of single well water recovery rate and water invasion volume changing with time.Based on reservoir geological and development characteristics,the study obtains the influence degree and law of the factors.(4)Optimization of thermal recovery and well pattern.With the method of numerical simulation,the study optimizes the thermal recovery way suitable for such reservoirs and gets the best two well patterns.(5)Steam drive injection-production parameters influence analysis and optimization design.Based on the analysis of injection-production parameters influence law,the study obtains optimal injection-production parameters.