The Numerical Simulation Study On The Measures To Adjust The Sub-main Layers In Polymer Flooding

At present,most oilfields in our country have entered the stage of tertiary oil recovery,and the polymer flooding technology is an important mining technology in the tertiary oil recovery technology. But because the polymer flooding technology mining areas are mainly concentrated in the high permeable zones,the technology still exists shortcomings,which are a lower proportion of mining and utilization rate of the polymer and the invalid loop. With the increment of chemistry with agent and oil production decline of oil field,polymer flooding technology cannot make oil fields achieve low cost,high benefits of mining demands. So it is necessary for polymer flooding technology to adjust well stimulation,and thus enhance the extraction ratio of polymer flooding technology,to achieve the optimal effect of mining.The purpose of this paper is to further improve the effect of N3 well block II-type oil reservoir I 5-7 and II 1-3 polymer flooding in Daqing oilfield,using numerical simulation software of Eclipse for the study on numerical simulation.For N3 well block polymer flooding,we analyze the molecular weight of polymer injection concentration of polymer injection,injection rate,together influence of dosage of polymer flooding recovery,the optimal polymer injection parameter optimization,the analysis of polymer flooding effect,and on this basis, the measures are adjusted. Because of reservoir heterogeneity and difference between the analyses of the necessity of polymer injection layer,according to the classification principles of formation,we determine the reasonable layered injection series of strata combination,and meanwhile give the optimal timing of stratification. By analyzing the factors influencing the fracturing effect,we select a reasonable fracturing timing for polymer flooding.Mode of different well pattern,well spacing and well spacing for mining effect are studied,as well as Polymer flooding well pattern and well spacing for II-type oil reservoir.We also determine the best solution for polymer flooding for N3 well block adjustment measures.