The Residual Oil Distribution Study Of Fluvial Facies Sandstone Reservoir In Kong Dian Oilfield

The reservoir of fluvial facies in Guan tao formation shows strong heterogeneity in the Kong Dian oilfield,once putting into production,the water cut of producing well is very high,the distribution of both reservoir and fluid is complex,after 40 years' development,the Kong Dian oilfield is currently in the extra high water-cut stage of the development stage of water flooding.Due to different blocks of physical properties,development plan lead to different development conditions.The oil recovery of Block North Kong 2 is 39.21%,but Block South Kong2 is 12.2%.O n the one hand there are still a lot of enrichment of remaining oil in the resrevoir,on the other hand the distribution of residual oil is not clear,for the aboveproblems,based on dynamic analysis and reservoir nunerical simulation,this paper has taken the study of water rising,reservoir numerical simulation method and remaining oil distribution.Aiming at the development characteristics of no anhydrous development period,high water cut of guantao reservoir in kongdian oilfield,combined with reservoir dynamic analysis,this paper analyzes the water cut rising law,pointing out it's oil and water layer reservoir,and different theoretical numerical simulation models were established to research factors including water saturation,high permeability belts between producer and injector,viscosity of crude.To improve the precision of reservoir numerical method,accurately predicting remaining oil distribution,from the practical application,build 3D geological model with facies controlling,It is proposed that the injection-producing profiles are used to separate water injection volume and fluid producing volume,different relative permeability curves are used for different regions,and in stages of resrevoir numerical simulation to improve the precision of numerical simulation,this make the simulation more in line with the actual situation,and provides a strong basis for exploitation of extra-high water cut developme stage.The remaing oil generally distributes with accumulation in certain areas,controlled by reservoir architecture.O n the basis of the reservoir numerical simulation results and dynamic analysis,and remaining oil distribution patterns controlled by different hierarchy architecture units,muddy lateral accretion sandwich,as a controlling factor of remaining oil distribution,is analyzed in detail.The results show that by means of accurately predicting remaining oil enrichment region,perfecting flooding producing well network,the thermal recovery wells will be arranged in high viscosity of heavy oil zone,the production wells could be enlarged the drawdown pressure and blocking water,the remaining oil of oil and water layer can be used effectively.