Injecting CO into oil reservoirs appears to be cost-effective and environmentally friendly due to decreasing the use of chemicals and cutting back on the greenhouse gas emission released. However, there is a pressing need for new algorithms to characterize oil/brine/rock system wettability, thus better predict and manage CO geological storage and enhanced oil recovery in oil reservoirs. We coupled surface complexation/CO and calcite dissolution model, and accurately predicted measured oil-on-calcite contact angles in NaCl and CaCl solutions with and without CO. Contact angles decreased in carbonated water indicating increased hydrophilicity under carbonation. Lowered salinity increased hydrophilicity as did Ca. Hydrophilicity correlates with independently calculated oil-calcite electrostatic bridging. The link between the two may be used to better implement CO EOR in fields.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6283841 | PMC |
| http://dx.doi.org/10.1038/s41598-018-35878-3 | DOI Listing |
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