Study on Mechanism of Oil-water Interface Interaction of Polyepichlorohydrin Dimethylamine Active Crude Oil
The water plugging experiment of polyepichlorohydrin dimethylamine active crude oil has a plugging rate of over 99%.This technology has also achieved significant economic benefits in Liaohe Oilfield field experiment,but its mechanism of action is still unclear.In this paper,the stabilizing mechanism of polyepichlorohydrin dimethylamine on the oil-water interface was described by measuring the strength of the interfacial film and molecular simulation technology.As a cationic polymer,polyepichlorohydrin dimethylamine can significantly enhance the oil-water interface film and reduce the formation energy of the interface.Its reasons for stabilizing the oil-water interface were mainly in two aspects:electrostatic adsorption,which combined polyepichlorohydrin dimethylamine with colloid and asphaltene with high electronegativity in heavy oil through electrostatic adsorption;bridging effect of polymer molecular chain,the polymer chain of polyepichlorohydrin dimethylamine bridged resin and asphaltene through electrostatic adsorption points,and the combination of the two action mechanisms obtained a stable oil-water interface membrane,realizing the highly effective water plugging effect of polyepichlorohydrin dimethylamine active crude oil.
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