Impact of pressure and temperature on CO₂-brine-mica contact angles and CO₂-brine interfacial tension: Implications for carbon geo-sequestration

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• 作者：Muhammad Arif ; ^{muhammad.arif@curtin.edu.au" class="auth_mail" title="E-mail the corresponding author} ; Ahmed Z. Al-Yaseri ; Ahmed Barifcani ; Maxim Lebedev ; Stefan Iglauer
• 关键词：Carbon geo sequestration ; Structural trapping ; Contact angle ; Interfacial tension ; Carbon dioxide ; Caprock ; Pressure ; Temperature ; Salinity
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 January 2016
• 年：2016
• 卷：462
• 期：Complete
• 页码：208-215
• 全文大小：1144 K

文摘

Precise characterization of wettability of CO₂–brine–rock system and CO₂–brine interfacial tension at reservoir conditions is essential as they influence capillary sealing efficiency of caprocks, which in turn, impacts the structural and residual trapping during CO₂ geo-sequestration. In this context, we have experimentally measured advancing and receding contact angles for brine–CO₂–mica system (surface roughness ∼12 nm) at different pressures (0.1 MPa, 5 MPa, 7 MPa, 10 MPa, 15 MPa, 20 MPa), temperatures (308 K, 323 K, and 343 K), and salinities (0 wt%, 5 wt%, 10 wt%, 20 wt% and 30 wt% NaCl). For the same experimental matrix, CO₂–brine interfacial tensions have also been measured using the pendant drop technique. The results indicate that both advancing and receding contact angles increase with pressure and salinity, but decrease with temperature. On the contrary, CO₂–brine interfacial tension decrease with pressure and increase with temperature. At 20 MPa and 308 K, the advancing angle is measured to be ∼110°, indicating CO₂-wetting. The results have been compared with various published literature data and probable factors responsible for deviations have been highlighted. Finally we demonstrate the implications of measured data by evaluating CO₂ storage heights under various operating conditions. We conclude that for a given storage depth, reservoirs with lower pressures and high temperatures can store larger volumes and thus exhibit better sealing efficiency.