Effect of CO2 Flooding on the Wettability Evolution of Sand-Stone

Wettability is one of the main parameters controlling CO2 injectivity and movement plume during geological sequestration. Despite significant research efforts, there still a high uncertainty associated with wettability CO2/brine/rock systems how they evolve exposure. This study, therefore, aims to measure contact angle sandstone samples varying clay content before after laboratory core flooding at different reservoir pressures, 10 MPa 15 MPa, temperature 323 K. The samples’ microstructural changes are also assessed investigate any potential alteration in structure due carbonated water results show that advancing receding angles increased increasing pressure for both Berea Bandera Gray samples. Moreover, indicate has higher angle. sandstones turn slightly more hydrophobic flooding, indicating become CO2-wet injection. These suggest leads an increase CO2-wettability sandstone, thus vertical migration solubility trapping, reduction residual trapping capacity, especially when extrapolated prolonged field-scale injection exposure times.