Abstract
Prolonged injection of magnesium chloride (MgCl2) brine into water-wet chalk cores leads to dissolution of calcite and precipitation of magnesium-bearing minerals. In low permeable and highly porous chalk, the mineral surfaces dominate multiphase flow properties. The hydrophobic/hydrophilic behavior of these mineral surfaces is subject to changes when aged in oil at high temperature over time, and from mineral dissolution and precipitation processes. In this study, we evaluate to which extent chemical interactions induced by the continuous MgCl2 brine injection modify the water wetness of chalk samples saturated by oil/water mixtures and compare the evolving results to a 100% water-saturated parallel reference test. The potential of MgCl2 brine to improve the oil recovery after the freely movable hydrocarbons are produced is also assessed. In situ wettability measurements were carried out during the injection program using chromatographic separation, where the delay in the increase of effluent concentrati...
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
