Quantitative Research Of Tracking And Adjustment Method For Polymer Flooding In Class ? Reservoir

The division criterions of the Class II Reservoirs are:permeability which is between 80?600x 10-3?m2,effective thickness 1-2.5m,permeability ratio in different units 1.4 and 3.5.Compared with the physical properties of main layers,there are obvious differences in Class? Reservoirs.So the choice of polymer injection parameters should be different from the main oil layers and the influencing factors of the developing effect are also different from the main lays'.A new set of evaluation system of polymer flooding development effect for Class? Reservoirs is needed to establish.Firstly,this paper has classified the injection wells of Beiyier West and East Block,Sazhong development area in Daqing Oilfield by applying the clustering method in statistical analysis software SPSS13.0,combined with static data of injection wells which takes effective thickness,number of layers(>lm),and the connected thickness proportion in three to four directions(>lm)as evaluation indexes.Then taking cumulative incremental oil in per unit thickness as a basis for evaluation,and using the variance analysis method of single variable and double factor to optimize the injection velocity and concentration in the sorted and different style of injectors.Analyzed the effect on the development of polymer flooding from the following eight aspects:fluid productivity index,flowing pressure,decline scope of water cut,in concentration,Polymer production concentration,injection pressure,water infectivity index in injection well,absorption strength in water injection well,polymer flooding control extent,and well spacing;statistical analysis of the development for Class II oil layer is carried out by principle component analysis and factor analysis.And evaluation system on the development of polymer flooding is built up.The technical help is provided for quantitative analysis of multi-factors,and it also has improved the dynamic analysis ability,added new work method,expanded the working ideas,so provided technical reserves for oil field development.So as to provide reference and basis for further improving the recovery in the secondary oil zone in Sazhong development zones.