Experimental Study on In-situ Emulsification Enhanced Oil Recovery of Glutenite Oil Reservoir

doi:10.3969/j.issn.1006-6535.2023.01.014

Abstract

Abstract: In view of the strong heterogeneity of the glutenite oil reservoir, an in situ emulsification enhanced oil recovery technology was proposed. The emulsification performance, interfacial tension reduction performance and oil displacement performance of the new W/O emulsification system (DMS) were studied, and at the same time the results were compared with the polymer/surfactant binary system used in the oil field. The experimental result shows that under different water contents, DMS can emulsify with crude oil to form W/O emulsion. With the increase of water content, the viscosity of emulsion increases. When the water content is 70%, the viscosity reaches the maximum value, which is 9 times of the viscosity of crude oil, much higher than the viscosity of binary system, and the fluidity control ability is stronger. DMS can be directionally adsorbed on the oil-water interface and reduce the oil-water interfacial tension to 0.12mN/m. Under the influence of DMS, oil and water are emulsified in situ to form W/O emulsion with a particle size of 0.5-6.0μm. In the glutenite core, DMS flooding and subsequent water flooding can improve the recovery by 18.6%. Under the permeability max-min ratio of 10, dual flooding and subsequent water flooding can improve the recovery by 24.0%, while DMS flooding and subsequent water flooding can improve the recovery by 35.3%, showing better fluidity control and the ability to improve the water absorption profile. The research result will provide theoretical support for enhanced oil recovery of glutenite oil reservoir

Key words: glutenite, in situ emulsification, W/O emulsion, heterogeneous regulation, enhanced oil recovery

CLC Number:

TE327

Luo Qiang, Li Ming, Li Kai, Ning Meng, He Wei, Du Daijun. Experimental Study on In-situ Emulsification Enhanced Oil Recovery of Glutenite Oil Reservoir[J]. Special Oil & Gas Reservoirs, 2023, 30(1): 100-106.

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