Study On Percolation Characteristics And Remaining Oil Distribution Law Of Long-term Water Flooding Reservoir In M Area

The characteristics of reservoir seepage change during long-term water flooding,the distribution of remaining oil is complicated,and it is difficult to tap potential.Area M is a typical long-term water flooding reservoir,with a history of 70 years of waterflooding development.Dissecting and analyzing the seepage characteristics and remaining oil distribution of area M can be targeted to improve the theory of longterm waterflood seepage,and to the Development guidance is of great significance.First of all,based on the investigation of the long-term water flooding seepage characteristics,this paper carried out physical simulation experiments of high multiple water flooding characteristics of M reservoir,combined with coring analysis data of different development stages of M reservoir,and analyzed the long-term water flooding Variation of oil efficiency and residual oil saturation.Secondly,based on the calculation and analysis of the experimental results,the realization method of the long-term water flooding phase permeability change in reservoir numerical simulation is studied,combined with the development history and production performance of M reservoir,a more accurate reservoir The numerical model has carried out three rounds of historical matching of more than 1200 wells and a 70-year development history,so that the model has reached a higher accuracy.Finally,through the study of the distribution of remaining oil after long-term water flooding in the M reservoir,the distribution of remaining oil is obtained.Based on the exploitation degree and the distribution of remaining oil in each area,the dynamic prediction of potential tapping schemes is formulated.The research results of this paper have certain guiding significance for long-term water flooding numerical simulation of low-permeability sandstone reservoirs and potential tapping of remaining oil.