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- W2897721527 abstract "Abstract Numerous studies reveal a moderate incremental oil recovery by injection of brine with a lower ionic strength than the connate brine in oil-wet systems. However, the combination of low salinity with surfactant flooding has been reported to give a vastly higher oil recovery. Despite overlooked laboratory investigations in this area, the underlying displacement mechanisms for the superior oil recovery have not been fully understood. In other words, there is inadequate direct evidence on pore-level displacement mechanisms accountable for the additional recovery. In this work we have employed a micro-CT scanner to observe the pore-scale fluid configurations for in-situ investigation of contact angles and local displacement patterns under elevated temperature and pressure conditions. We present the results of various experiments involving flow through porous media using different wetting fluid systems on a set of miniature limestone core samples. The brine solutions are chosen as to allow us to investigate the impacts of surfactant and salinity on their associated oil–brine flow behaviors during waterflooding experiments. The core samples are subjected to a dynamic aging process before commencement of waterflooding tests. Characterization of local wettability reveal an accelerated reversal toward neutral wetness due to the low-salinity surfactant effects. The in-situ contact angles sharply change by injection of small pore volumes of low-salinity surfactant solution. This impact is more profound when injection is succeeding a low-salinity waterflooding. In this study, the main mechanism responsible for the enhancement of oil recovery appears to be the improvement of brine frontal advance displacement to smaller pore constrictions and to the corners of pore elements. This is found to be a result of fast surfactant-induced wettability transition to neutral-wet condition." @default.
- W2897721527 created "2018-10-26" @default.
- W2897721527 creator A5045576094 @default.
- W2897721527 date "2018-09-24" @default.
- W2897721527 modified "2023-10-16" @default.
- W2897721527 title "Pore-Scale Investigation of the Effect of Surfactant on Fluid Occupancies during Low-Salinity Waterflooding in Oil-Wet Carbonates" @default.
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- W2897721527 doi "https://doi.org/10.2118/194045-stu" @default.
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