Firas Alnili1, Ahmed Al-Yaseri2, Hamid Roshan3, Taufiq Rahman2, Michael Verall4, Maxim Lebedev5, Mohammad Sarmadivaleh2, Stefan Iglauer6, Ahmed Barifcani2. 1. Department of Chemical Engineering, Curtin University, Perth, Australia. Electronic address: f.alnili@postgrad.curtin.edu.au. 2. Department of Petroleum Engineering, Curtin University, Perth, Australia. 3. School of Petroleum Engineering, University of New South Wales, Kensington, New South Wales, Australia. 4. RSO CSIRO - Mineral Resources, Perth, Australia. 5. Department of Exploration Geophysics, Curtin University, Perth, Australia. 6. Petroleum Engineering, School of Engineering | Edith Cowan University Joondalup, WA 6027, Australia.
Abstract
HYPOTHESIS: Wettability plays an important role in underground geological storage of carbon dioxide because the fluid flow and distribution mechanism within porous media is controlled by this phenomenon. CO2 pressure, temperature, brine composition, and mineral type have significant effects on wettability. Despite past research on this subject, the factors that control the wettability variation for CO2/water/minerals, particularly the effects of pores in the porous substrate on the contact angle at different pressures, temperatures, and salinities, as well as the physical processes involved are not fully understood. EXPERIMENTS: We measured the contact angle of deionised water and brine/CO2/porous sandstone samples at different pressures, temperatures, and salinities. Then, we compared the results with those of pure quartz. Finally, we developed a physical model to explain the observed phenomena. FINDINGS: The measured contact angle of sandstone was systematically greater than that of pure quartz because of the pores present in sandstone. Moreover, the effect of pressure and temperature on the contact angle of sandstone was similar to that of pure quartz. The results showed that the contact angle increases with increase in temperature and pressure and decreases with increase in salinity.
HYPOTHESIS: Wettability plays an important role in underground geological storage of carbon dioxide because the fluid flow and distribution mechanism within porous media is controlled by this phenomenon. CO2 pressure, temperature, brine composition, and mineral type have significant effects on wettability. Despite past research on this subject, the factors that control the wettability variation for CO2/water/minerals, particularly the effects of pores in the porous substrate on the contact angle at different pressures, temperatures, and salinities, as well as the physical processes involved are not fully understood. EXPERIMENTS: We measured the contact angle of deionised water and brine/CO2/porous sandstone samples at different pressures, temperatures, and salinities. Then, we compared the results with those of pure quartz. Finally, we developed a physical model to explain the observed phenomena. FINDINGS: The measured contact angle of sandstone was systematically greater than that of pure quartz because of the pores present in sandstone. Moreover, the effect of pressure and temperature on the contact angle of sandstone was similar to that of pure quartz. The results showed that the contact angle increases with increase in temperature and pressure and decreases with increase in salinity.