TY  - JOUR
N2  - Rock/fluid interfacial tension (γrockâ??fluid) govern the fluid flow dynamics, the injection/withdrawal rates, the gas storage capacity, and containment integrity during gas (H2, CO2, N2) geo-storage. Clay-gas interfacial tension (γclayâ??gas) data, especially for the clay-H2 (γclayâ??H2), the clay-N2 (γclayâ??N2) and the clay-CO2 (γclayâ??CO2) systems, have rarely been reported in the literature due to the challenging nature of these measurements in the laboratory. In this study, Neumann's equation of state and Young-Laplace equation was combined to compute clay-gas and clay-brine interfacial tensions (IFT) parameters at realistic geo-storage temperature (333 K) and pressure (5â??20 MPa). Our results show that at similar thermodynamic conditions: γclayâ??H2 >γclayâ??N2>γclayâ??CO2. Our calculations also showed that: γkaoliniteâ??N2>γilliteâ??N2>γmontmorilloniteâ??N2, and γkaoliniteâ??CO2>γilliteâ??CO2>γmontmorilloniteâ??CO2. In contrast, for hydrogen a negligible difference in γclayâ??H2 was obtained for the three clay types, although, the IFT between clay minerals and brine in presence of hydrogen is different for these three clay types. Overall, computed γclayâ??H2 values were higher than γclayâ??N2 and γclayâ??CO2 values, whereas computed clay-brine interfacial tension was lower in presence of hydrogen compared to carbon dioxide and nitrogen. These results suggest that nitrogen and carbon dioxide could be used as favorable cushion gas for maintaining formation pressure during underground hydrogen storage. We also demonstrated a remarkable relationship between clay/gas IFT and gas density that could serve as a helpful tool for quick estimation of rock-fluid interfacial tension. © 2022 Hydrogen Energy Publications LLC
JF  - International Journal of Hydrogen Energy
VL  - 47
AV  - none
EP  - 19167
KW  - Clay minerals; Density of gases; Digital storage; Equations of state of gases; Flow of fluids; Gases; Hydrogen storage; Van der Waals forces
KW  -  Clay type; Clay-gas interfacal tension; Containment integrity; Cushion gas; Equation-of-state; Fluid flow dynamics; Gas storage capacity; Neumann equation; Underground hydrogen storage; Withdrawal rate
KW  -  Carbon dioxide
PB  - Elsevier Ltd
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85131200190&doi=10.1016%2fj.ijhydene.2022.04.103&partnerID=40&md5=e02ae185199c6eefab2411c07da0c47c
ID  - scholars16734
TI  - Clay-hydrogen and clay-cushion gas interfacial tensions: Implications for hydrogen storage
SN  - 03603199
Y1  - 2022///
A1  - Yekeen, N.
A1  - Al-Yaseri, A.
A1  - Negash, B.M.
A1  - Ali, M.
A1  - Giwelli, A.
A1  - Esteban, L.
A1  - Sarout, J.
N1  - cited By 40
IS  - 44
SP  - 19155
ER  -