Reservoir Engineering Calculation And Numerical Simulation Study On Injection And Production Test Of The Same Well In D Oilfield

During the middle and late stage of oilfield development,water cut of production well is high.There are dominant seepage channel which caused by injection water in the formation,resulting in low oil recovery of reservoir.Injection and production in the same well technology can increase water injection well spots of reinjection layer,reduce ineffective water cycle,increase the sweep volume of injection water,and improve the recovery efficiency of reservoir.Therefore,it is necessary to carry out the research on the mechanism of enhanced oil recovery by injection and production in the same well technology.In this paper,development effect of injection and production in the same well technology is studied from two different aspects of reservoir engineering and numerical simulation.Reinjection pressure calculation model is deduced by theory of seepage mechanics and reservoir engineering method.Then average reinjection pressure is calculated by this model,its value is 19.29 MPa.Prediction model for development effects of injection and production in the same well technology is deduced by theory of seepage mechanics and reservoir engineering method.By using this model,average development period of 12 wells is 15.39 years,average volume of oil increment of injection-production wells is 4538.51m~3,sum is 54462.13m~3;average volume of oil increment of oil wells is 2055.10m~3,sum is 24661.25m~3.Total volume of oil increment of injection and production in the same well technology is 79123.38m~3.We built structural model,layer model,sedimentary facies model and attribute model for this study area,by using the geological modeling software named Petrel.Based on the fine geological model,combined with a reservoir numerical simulation software named Eclipse,we did a history matching for this study area.Fitting precision of the whole area is 95%,fitting coincidence rate of single well is 80%.The dominant type of remaining oil in this oilfied is residual oil caused by imperfect well pattern,which accounts for 70%of the remaining oil.By running the numerical simulation prediction program,we got average volume of oil increment of 12 injection-production wells is 3310.82m~3,total volume of oil increment of them is 39729.80m~3,average volume of oil increment of effective wells is 2914.56m~3,total volume of oil increment of the them is 34974.75m~3.In conclusion,the volume of cumulative oil production is 74704.55m~3.