Energy & Fuels, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 4, 2024

There is increasing interest in attainment of a CO2-free global economy and net zero carbon emissions by 2050 to mitigate the negative impact warming unfavorable climate change. However, success large-scale underground H2 CO2 storage depends on rock wetting behavior dynamics gas/brine interfacial tension (IFT), which significantly influences capillary pressure. Previous studies have demonstrated that wettability can be altered into hydrophilic state using surface-active chemicals such as surfactants, nanoparticles, methyl orange, blue. these also showed higher propensity reduce IFT, for residual structural trapping potential host rock. Herein, limestone modification capacity polymeric surfactant (chitosan salt) its impacts CO2/brine H2/brine IFT were evaluated pendant drop technique pressure measurement. Results shifted right presence chitosan salt solutions, indicating reduction needed push water pore spaces This effect increased with concentrations solution from 100 1000 ppm. Specifically, at 200 psi, saturation seawater-saturated cores about 50 70% whereas deionized water-saturated 25 40% ppm concentration. The CO2/water interface H2/water no significant effects tension. Moreover, adsorption DI seawater molecules was salt, suggesting promotes adhesion H2O but discourages Our results generally modify hydrophobic rocks, turning them wet while mitigating could increase Hence, geo-storage rocks promising strategy derisking optimizing formations.

Language: Английский