Rock-fluid interfacial tension at subsurface conditions: Implications for H2, CO2 and natural gas geo-storage

Perspectives and prospects of underground hydrogen storage and natural hydrogen

“…55,57,58 However, from the literature, a higher amount of CO 2 can be stored in the same structural volume compared to hydrogen. 57,59 CO 2 storage is intended to be a long-term and permanent storage known as CO 2 sequestration. The CO 2 storage operation is not cyclic, due to the characteristic absence of the withdrawal stage to meet the main goals of CO 2 storageits removal from the atmosphere.…”

“…The CO 2 storage operation is not cyclic, due to the characteristic absence of the withdrawal stage to meet the main goals of CO 2 storageits removal from the atmosphere. 56,59 The co-production of CO 2 with other existing uids in the porous media is not a concern in the case of CO 2 storage; besides, the problems such as withdrawal rates, number of cycles, and idle time between injection/withdrawal, are not encountered in CGS operation. Unlike UHS, different aspects of leakage risks from the caprock and operation facilities, and other failures resulting from corrosion need to be considered, in the case of CGS.…”

“…More so, CO 2 is prone to reactions with rock and in situ uids that promote the dissolution of the caprock minerals, further increasing the risk of leakage. 60,61 According to Pan et al, 59 the benchmark data from CGS and NGS projects are more oen used to estimate or predict the behaviours of H 2 or the occurrences in underground hydrogen storage (UHS) reservoirs. However, relying entirely on such a benchmark may be misleading since CO 2 , H 2 , CH 4 and other hydrocarbon uids exhibit different physical and chemical properties.…”

Contact Angles of a Brine on a Bituminous Coal in Compressed Hydrogen

“…Recently, Pan et al. (Pan, Yin, & Iglauer, 2021) and Ali et al. (Ali et al., 2022) used Neumann's equation of state approach (Neumann et al., 2011) to extract the pressure dependence of the solid–gas interfacial tension from literature data.…”

In-situ hydrogen wettability characterisation for Underground Hydrogen Storage

“…The quartz samples aged with stearic acid became weakly water-wet to intermediate-wet with contact angles increasing with increasing concentration of stearic acid. The second study was conducted by Pan et al 2021, who investigated the change in wetting properties with temperature, pressure, stearic acid concentration, and organic acid carbon number for the hydrogen-water system. The focus of the paper was to determine the interfacial tension between the rock and fluid rather than the interfacial tension between the two fluids to gain a deeper understanding of the surface energies present in this system.…”