Viscous Effects of Wetting and Non-Wetting Fluids on Capillary Trapping Mechanism: A Climate Change Mitigation Strategy. Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/fn107096w

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  • Rising CO₂ concentrations in the atmosphere (396 ppmv as of April 2012) increase the effect of global warming and climate change. CO₂ sequestration has become a potential method to mitigate climate change. This study focuses on capillary/residual trapping as a form of geologic CO₂ sequestration. Capillary/residual trapping occurs when supercritical CO₂ is stored in rock pore spaces after injection at high temperatures and pressures. This project aims to isolate the effects of viscosity from that of interfacial tension, which also influences capillary/residual trapping. Understanding how viscosity affects capillary/residual trapping is a key to determine optimal injection temperatures and pressures, which maximize CO₂ trapping. Two viscothickeners, guar gum and glycerol were used to vary the viscosity of KI brine without changing interfacial tension. Subsequently, guar gum and KI brine mixtures were injected into rock cores to determine capillary/residual potential. Results suggest that higher viscosities increase residual trapping potential. This study provides an initial analysis of the role of viscous effects in capillary trapping of CO2.
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