Electrostatic Origins of CO2-Increased Hydrophilicity in Carbonate Reservoirs
|dc.identifier.citation||Chen, Y. and Sari, A. and Xie, S. and Brady, P. and Hossain, M. and Saeedi, A. 2018. Electrostatic Origins of CO2-Increased Hydrophilicity in Carbonate Reservoirs. Scientific Reports. 8 (1): Article ID 17691.|
Injecting CO2 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 CO2 geological storage and enhanced oil recovery in oil reservoirs. We coupled surface complexation/CO2 and calcite dissolution model, and accurately predicted measured oil-on-calcite contact angles in NaCl and CaCl2 solutions with and without CO2. Contact angles decreased in carbonated water indicating increased hydrophilicity under carbonation. Lowered salinity increased hydrophilicity as did Ca2+. Hydrophilicity correlates with independently calculated oil-calcite electrostatic bridging. The link between the two may be used to better implement CO2 EOR in fields.
|dc.publisher||Nature Publishing Group|
|dc.title||Electrostatic Origins of CO2-Increased Hydrophilicity in Carbonate Reservoirs|
|curtin.department||WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)|