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Predicting the electrokinetic properties of the crude oil/brine interface for enhanced oil recovery in low salinity water flooding

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Title: Predicting the electrokinetic properties of the crude oil/brine interface for enhanced oil recovery in low salinity water flooding
Authors: Takeya, Miku Browse this author
Shimokawara, Mai Browse this author
Elakneswaran, Yogarajah Browse this author
Nawa, Toyoharu Browse this author →KAKEN DB
Takahashi, Satoru Browse this author
Keywords: Zeta potential
Electrical triple-layer
Surface complexation model
Low salinity water
Issue Date: 1-Jan-2019
Publisher: Elsevier
Journal Title: Fuel
Volume: 235
Start Page: 822
End Page: 831
Publisher DOI: 10.1016/j.fuel.2018.08.079
Abstract: The low-salinity waterflooding (LSWF) technique during enhanced oil recovery has received increasing attention over the last decade. Several studies have attempted to understand the effects of LSWF through both experiments and modelling, but their results are inconsistent due to a lack of understanding of the crude oil/brine and brine/rock interfaces. In this paper, the crude oil/brine interface was studied by developing a triple-layer surface complexation model. The carboxyl groups(-COOH) were attributed to the surface charge and electrical triple-layer development of the crude oil in LSWF. The zeta potentials of the emulsion at various pH levels and the calcium and magnesium concentrations were measured to examine the interface. These data were then directly fitted to the simulated zeta potentials to determine the surface site density of -COOH and the associated equilibrium constants for the dissociation and adsorption of calcium and magnesium. The -COOH site density was determined by fitting the pH-independent zeta potential, while the equilibrium constant values were estimated from the variations in the zeta potential with the changes in pH and the concentrations of calcium and magnesium. The determined surface complexation parameters were validated by comparing the experimental zeta potential data from different ionic solutions. The developed surface complexation model was used along with the estimated parameters to predict the interface of crude oil in seawater, formation water, and their dilutions. The simulated zeta potential results agreed well with the experimental data, demonstrating that the model is applicable to understand the crude oil/brine interface in LSWF. Finally, the importance of the prediction of the surface and zeta potentials in the evaluation of the interface and the estimation of electrostatic forces, and thus the wettability alteration, was discussed.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Elakneswaran YOGARAJAH

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