Evaluation and application of polymer flooding development effect considering shearing near wellbore
There are great effects of shearing near wellbore on the viscosity of polymer solution.The influence law of injection rate and perforation density on polymer solution viscosity is revealed with laboratory experiments.Based on the law,the influence of injection rate,time of polymer flooding,slug size and polymer concentration on the development effect was studied.Results showsed that there was little influence when the injection rate was less than 10 m3/(d·m),the water cut of 90%was a favorable opportunity for polymer flooding,the slug size and polymer concentration were positively correlated with enhanced oil recovery.Based on the information entropy method,an evaluation method for polymer flooding considering near wellbore shear was established and then it was determined that the slug size was 0.6 PV and the polymer concentration was 3.0×103 mg/L.The on-site application indicates that it is more realistic considering near wellbore shearing during polymer flooding which is significant for the preparation of plans.
shearing near wellborepolymer floodingviscosity retention rateprecipitation increases oil pro-duction
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