Performance of Polymer/Surfactant Binary Flooding in Enlarging Swept Volumes

doi:10.11885/j.issn.1674-5086.2017.04.29.01

Abstract

Abstract: Oil displacement experiments were carried out using microetching and slabs with interlayer and intralayer heterogeneities, in order to investigate the performance of polymer/surfactant binary floods in enlarging the swept volumes. The results indicate that the residual oils exist in the form of films, islands, throats, dead ends, columns, and clusters. On the microscopic scale, the binary flooding was found to displace residual oils from oil-containing pores that could not be swept by water flooding. On the macroscopic scale, the binary flooding generated blockages in high-permeability zones, causing the floods to enter low-permeability zones with lower levels of resistance to seepage, thus displacing residual oils in these zones. Binary flooding increased recovery rates by 13.4%~14.3% as compared to water flooding, and thus had a significant effect on enlarging the swept volumes. In binary flooding, the polymer increased the viscosity of the displacing fluid, causing the latter to become adsorbed and retained in the pores. This effectively decreased the permeability and flow rate of the displacement phase. Meanwhile, binary flooding had a very small impact on oil viscosity, and therefore the oils aggregated along the leading edge of the displacing fluid, which increased the permeability and flow rate of the oil phase. Therefore, such binary flooding reduces the mobility ratio, prevents viscous fingering, and increases water intake thickness and conformance factor, thus improving oil recovery rates.

Key words: polymer/surfactant binary flooding, residual oils, viscosity, swept volume, recovery rate

CLC Number:

TE357.46

WEI Yunyun, LIU Jianjun, LUO Litao, LIU Xiangui, YANG Zhengming. Performance of Polymer/Surfactant Binary Flooding in Enlarging Swept Volumes[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 175-184.

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