TY - JOUR
T1 - A comparative study for H2–CH4 mixture wettability in sandstone porous rocks relevant to underground hydrogen storage
AU - Hashemi, Leila
AU - Boon, Maartje
AU - Glerum, Wuis
AU - Farajzadeh, Rouhi
AU - Hajibeygi, Hadi
PY - 2022
Y1 - 2022
N2 - Characterizing the wettability of hydrogen (H2)–methane (CH4) mixtures in subsurface reservoirs is the first step towards understanding containment and transport properties for underground hydrogen storage (UHS). In this study, we investigate the static contact angles of H2–CH4 mixtures, in contact with brine and Bentheimer sandstone rock using a captive-bubble cell device at different pressures, temperatures and brine salinity values. It is found that, under the studied conditions, H2 and CH4 show comparable wettability behaviour with contact angles ranging between [25°–45°]; and consequently their mixtures behave similar to the pure gas systems, independent of composition, pressure, temperature and salinity. For the system at rest, the acting buoyancy and surface forces allow for theoretical sensitivity analysis for the captive-bubble cell approach to characterize the wettability. Moreover, it is theoretically validated that under similar Bond numbers and similar bubble sizes, the contact angles of H2 and CH4 bubbles and their mixtures are indeed comparable. Consequently, in large-scale subsurface storage systems where buoyancy and capillary are the main acting forces, H2, CH4 and their mixtures will have similar wettability characteristics.
AB - Characterizing the wettability of hydrogen (H2)–methane (CH4) mixtures in subsurface reservoirs is the first step towards understanding containment and transport properties for underground hydrogen storage (UHS). In this study, we investigate the static contact angles of H2–CH4 mixtures, in contact with brine and Bentheimer sandstone rock using a captive-bubble cell device at different pressures, temperatures and brine salinity values. It is found that, under the studied conditions, H2 and CH4 show comparable wettability behaviour with contact angles ranging between [25°–45°]; and consequently their mixtures behave similar to the pure gas systems, independent of composition, pressure, temperature and salinity. For the system at rest, the acting buoyancy and surface forces allow for theoretical sensitivity analysis for the captive-bubble cell approach to characterize the wettability. Moreover, it is theoretically validated that under similar Bond numbers and similar bubble sizes, the contact angles of H2 and CH4 bubbles and their mixtures are indeed comparable. Consequently, in large-scale subsurface storage systems where buoyancy and capillary are the main acting forces, H2, CH4 and their mixtures will have similar wettability characteristics.
KW - Captive-bubble cell
KW - Contact angle
KW - H-CH mixtures
KW - Underground hydrogen storage
KW - Wettability
UR - http://www.scopus.com/inward/record.url?scp=85126617676&partnerID=8YFLogxK
U2 - 10.1016/j.advwatres.2022.104165
DO - 10.1016/j.advwatres.2022.104165
M3 - Article
AN - SCOPUS:85126617676
SN - 0309-1708
VL - 163
JO - Advances in Water Resources
JF - Advances in Water Resources
M1 - 104165
ER -