Zeta potential in oil-water-carbonate systems and its impact on oil recovery during controlled salinity water-flooding

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Title: Zeta potential in oil-water-carbonate systems and its impact on oil recovery during controlled salinity water-flooding
Author(s): Jackson, MD
Al-Mahrouqi, D
Vinogradov, J
Item Type: Journal Article
Abstract: Laboratory experiments and field trials have shown that oil recovery from carbonate reservoirs can be increased by modifying the brine composition injected during recovery in a process termed controlled salinity water-flooding (CSW). However, CSW remains poorly understood and there is no method to predict the optimum CSW composition. This work demonstrates for the first time that improved oil recovery (IOR) during CSW is strongly correlated to changes in zeta potential at both the mineral-water and oil-water interfaces. We report experiments in which IOR during CSW occurs only when the change in brine composition induces a repulsive electrostatic force between the oil-brine and mineral-brine interfaces. The polarity of the zeta potential at both interfaces must be determined when designing the optimum CSW composition. A new experimental method is presented that allows this. Results also show for the first time that the zeta potential at the oil-water interface may be positive at conditions relevant to carbonate reservoirs. A key challenge for any model of CSW is to explain why IOR is not always observed. Here we suggest that failures using the conventional (dilution) approach to CSW may have been caused by a positively charged oil-water interface that had not been identified.
Publication Date: 23-Nov-2016
Date of Acceptance: 24-Oct-2016
URI: http://hdl.handle.net/10044/1/41937
DOI: https://dx.doi.org/10.1038/srep37363
ISSN: 2045-2322
Publisher: Nature Publishing Group
Journal / Book Title: Scientific Reports
Volume: 6
Copyright Statement: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Total E&P UK Limited
Funder's Grant Number: 4300003006
Publication Status: Published
Article Number: 37363
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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