Influence of stearic acid and alumina nanofluid on CO wettability of calcite substrates: Implications for CO geological storage in carbonate reservoirs.

Hypothesis: Atmospheric CO emissions trigger global warming and climate change challenges. Thus, geological CO storage appears to be the most viable choice to mitigate CO 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 CO storage and injection problems.

Influence of Organic Acid Concentration on Wettability Alteration of Cap-Rock: Implications for CO Trapping/Storage.

Every year, millions of tons of CO are stored in CO-storage formations (deep saline aquifers) containing traces of organic acids including hexanoic acid C (HA), lauric acid C (LuA), stearic acid C (SA), and lignoceric acid C (LiA). The presence of these molecules in deep saline aquifers is well documented in the literature; however, their impact on the structural trapping capacity and thus on containment security is not yet understood. In this study, we therefore investigate as to how an increase in organic acid concentration can alter mica water wettability through an extensive set of experiments.

Effect of nanofluid on CO-wettability reversal of sandstone formation; implications for CO geo-storage.

Hypothesis: Nanofluid treatment is a promising technique which can be used for wettability reversal of CO-brine-mineral systems towards a further favourable less CO-wet state in the existence of organic acids. However, literature requires more information and study with respect to organic acids and nanoparticles' effect at reservoir (high pressure and high temperature) conditions.

Experiments: Therefore, we have measured in this study that what influence small amounts of organic acids exposed to quartz for aging time of (7 days and 1 year) have on their wettability and how this impact can be reduced by using different concentrations of nanoparticles at reservoir conditions.