The Physical Simulation Experiment Combined With The Vertical Wells And Horizontal Wells Form Water Flooding To Chemical Flooding Base On The Point Bar Architecture

In China,most of the point bar reservoirs have entered the stage of high water flood,the recovery is lower,the chemical flooding is the most important way of the exploitation of the oilfield at the later stages,but due to the impact of the reservoir layer in the exploitation,there are still a lot of remaining oil in the reservoir.So how to further improve the oil recovery is the key to the exploitation of point bar reservoirs,and the further improve of the technical measures of oil recovery also depends on the correct combination of the vertical wells and the horizontal wells and the distribution of scientific understanding of the point bar reservoir residual oil formation.This experiment bases on the architecture of monosandbody of the point bar,and we build 3D physical model.Through the experimental,we can explore the using of the horizontal wells in the remaining oil,having a correcting understanding of the injectant characteristics and the internal space of the remaining oil distribution mechanism of the physical model,and it can provide a scientific basis for the further exploitation of the residual oil of the r point bar reservoirs.This study,the North fault block of Daqing oilfield in east area as an example,based on the key sedimentary units compared with the study of sedimentary microfacies,we extract the inclination,tendency of point bar inside the sandwich configuration parameters,and establish the point bar geological model by using petrel software.We simulate the meandering river point bar based on three-dimensional physical base on the geological model research,focusing on the characteristics of the internal structure and the deposition in the point bar of PI2 b,the design of vertical and horizontal wells in two groups of the same configuration combined with three-dimensional physical experimental model of physical simulation experiment from water flooding to chemical flooding.Three different well patterns are designed in the chemical flooding stage.When the water content is higher than the standard,the model will change the well pattern.The experimental data are used to compare the recovery degree of different well patterns,and the experimental phenomenas are analyzed.In the water flooding stage,the recovery rate of the model is about 40%,and after the experiment the recovery of the model can reach about 60%,and the recovery can be increased by about 20%.At the end of the experiment,the model was used to study the water flooding pattern of different layers.It is found that the high water flooding at the bottom of the pointbar model is the dominant seepage channel.The remaining oil in the model can be well used,the recovery of up to 68%,while the upper part of the model has a large amount of remaining oil due to the overlying mudstone and the upward tilt.The displacement of the horizontal well injection end,the blocking effect of the mud interlayer and the abandoned channel,and the displacement effect of the different well patterns make the distribution of the remaining oil in the vertical plane and the plane different.At the same time,horizontal wells injection,well pattern layout of the vertical well is better for the study area.