Study on oil displacement performance of a temperature-resistant and salt-resistant oil-based supramolecular system

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Abstract Polymer microspheres have the characteristics of low injection climbing pressure, good deep migration effect, temperature resistance and salt resistance, and low cost. As a commonly used oil displacement agent, polyacrylamide microsphere emulsion cannot achieve good oil displacement under such reservoir conditions of high temperature and salinity. Therefore, it is necessary to study the new oil-based supramolecular systems of non-polyacrylamide. In this paper, 50 nm and 100 nm polyacrylamide microspheres commonly used in oilfields and oil-based supramolecular microspheres are selected for comparative research. In the analysis and observation, the particle size, viscosity, and agglomeration behavior of the polymer microspheres, the oil-water mass transfer behavior in the capillary, and the interfacial tension reduction of each sample, the effects of temperature and surfactant on the peeling of crude oil droplets of polymer microspheres were studied through microscopically visible oil droplet exfoliation experiments. By calibrating the moving speed of the outer contact line generated by different microspheres during the peeling process of crude oil droplets, the microscopic effect of different types of microspheres peeling off oil droplets was quantitatively analyzed. The results show that the polymer microspheres and the surfactant have a synergistic effect, which can greatly improve the speed of stripping oil droplets. Among these three kinds of microspheres, the oil-based supramolecular microsphere system has better temperature resistance and salt resistance, and the effect of stripping oil droplets is the best, followed by 50 nm microspheres, and 100 nm microspheres had the worst peeling effect. Therefore, the oil-based supramolecular system is a new type of oil displacement system with good development prospects.

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	JU Ye
	QU Jin
	LI Xiang
	LIU Fenggang
	LI Xiaowei
	WANG Shuo
	MA Xinru
	LIU Xiaofei

Keywords： oil-based supramolecular microspheres oil droplet stripping oil displacement synergy

Received 2022-08-25;

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JU Ye, QU Jin, LI Xiang, LIU Fenggang, LI Xiaowei, WANG Shuo, MA Xinru, LIU Xiaofei.Study on oil displacement performance of a temperature-resistant and salt-resistant oil-based supramolecular system[J] Chemcial Industry and Engineering, 2023,V40(4): 102-110

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