Study On Advanced Water Injection Development Technology In Low Permeability Oilfield

The Aobaota oil field is a low permeability and thin reservoir.The reservoir seepage resistance is large and the pressure conduction is poor.The production decline of oil wells is fast after production,and the water injection is slow.At present,the unproved reserves and the reserves to be submitted are mainly low and ultra-low permeability reservoirs,which are difficult to develop.Advanced water injection development can reasonably compensate formation energy,improve the formation pressure,to prevent the loss of reservoir permeability,establishing effective driving system,to increase the oil production capacity and slow rate of decline,is a low permeability oilfield development effectively,flooding effect is of great significance to improve the low permeability oil field water.In this paper,based on the results of physical simulation and numerical simulation,the technical limits for advanced water injection in Fuyu oil layer and Putaohua reservoir are determined.According to the results of the indoor physical simulation,we get some regular knowledge: under the reasonable pressure level,the advance water injection is high in the initial stage of production,and the water is early,but it has a certain inhibition effect on the rising rate of water cut in the process of production,which is beneficial to the improvement of the final recovery.For low permeability reservoirs with the same pressure level,the volume of the injected fluid is different.The lower the permeability is,the greater the volume of the pore volume of the injection liquid is needed to reach the same formation pressure level.Comparing the experimental results of Fuyu oil layer and Putaohua reservoir,we know that the lower permeability of reservoir is,the better the effect of advanced water injection development is compared with synchronous water injection.