Chemical Mechanism of Polymer Microsphere Flooding and Its Application in Low Permeability Oilfield Development
A polymer nano microsphere oil displacement agent was prepared in the laboratory by the inverse micro lotion method.First,the physical and chemical properties of the polymer nano microsphere were tested.The results showed that the prepared microsphere could expand to 2.3 times of the initial value at room temperature,and had excellent high temperature resistance,mineralization resistance and plugging performance.The initial average particle size of the laser particle size analyzer test results was basically around 130 nm.Combining the dual tube parallel experimental platform,the displacement effect analysis of key factors such as microsphere particle size,injection concentration,injection amount,and permeability difference was conducted,and the optimal injection parameters of 1 600 mg·L-1 polymer nanospheres at 0.3 PV were selected.The effectiveness of polymer nanospheres as oil displacement agents was further evaluated based on actual field well group experiments.
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