Abstract
HypothesisAtmospheric CO2 emissions trigger global warming and climate change challenges. Thus, geological CO2 storage appears to be the most viable choice to mitigate CO2 emissions in the atmosphere. However, the adsorption capacity of reservoir rock in the presence of diverse geological conditions, including organic acids, temperature, and pressure, can cause reduced certainty for CO2 storage and injection problems. Wettability is critical in measuring the adsorption behavior of rock in various reservoir fluids and conditions. ExperimentWe systematically evaluated the CO2-wettability of calcite substrates at geological conditions (323 K and 0.1, 10, and 25 MPa) in the presence of stearic acid (a replicate realistic reservoir organic material contamination). Similarly, to reverse the effects of organics on wettability, we treated calcite substrates with various alumina nanofluid concentrations (0.05, 0.1, 0.25, and 0.75 wt%) and evaluated the CO2-wettability of calcite substrates at similar geological conditions. FindingsStearic acid profoundly affects the contact angle of calcite substrates where wettability shifts from intermediate to CO2-wet conditions, reducing the CO2 geological storage potential. The treatment of organic acid-aged calcite substrates with alumina nanofluid reversed the wettability to a more hydrophilic state, increasing CO2 storage certainty. Further, the optimum concentration displaying the optimum potential for changing the wettability in organic acid-aged calcite substrates was 0.25 wt%. The effect of organics and nanofluids should be augmented to improve the feasibility of CO2 geological projects at the industrial scale for reduced containment security.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.