Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Viscosification of CO2 to improve subsurface storage — A modeling study
Abstract In this work, we numerically investigate the potential benefits of a recently proposed functional molecule that can both significantly increase the viscosity of CO and reduce the residual water saturation in the context of CO storage in subsurface aquifers. We model different degrees of CO viscosification in field-scale formations at both shallow and greater depths, consider a range of permeabilities from 100 md to 2,000 md, and both homogeneous and highly heterogeneous formations. To quantify the impacts of CO viscosification, we track multiple domain-integrated quantitative measures such as CO tip velocity and dispersion widths. In all scenarios, we find that CO viscosification increases the total amount of CO retained but the degree of improvement varies. Moreover, the fraction of solubility trapping versus structural trapping is highest for neat CO. These modeling results can inform stakeholders in CO viscosification technology for future large-scale CO storage projects.
Highlights Novel functional molecules offer thermodynamically stable viscosification of CO2. Reduced mobility ratio improves sweep efficiency of injected CO2. Reduction in residual water saturation improves storage capacity. CO2 viscosification does not have appreciable effect on well injectivity.
Viscosification of CO2 to improve subsurface storage — A modeling study
Abstract In this work, we numerically investigate the potential benefits of a recently proposed functional molecule that can both significantly increase the viscosity of CO and reduce the residual water saturation in the context of CO storage in subsurface aquifers. We model different degrees of CO viscosification in field-scale formations at both shallow and greater depths, consider a range of permeabilities from 100 md to 2,000 md, and both homogeneous and highly heterogeneous formations. To quantify the impacts of CO viscosification, we track multiple domain-integrated quantitative measures such as CO tip velocity and dispersion widths. In all scenarios, we find that CO viscosification increases the total amount of CO retained but the degree of improvement varies. Moreover, the fraction of solubility trapping versus structural trapping is highest for neat CO. These modeling results can inform stakeholders in CO viscosification technology for future large-scale CO storage projects.
Highlights Novel functional molecules offer thermodynamically stable viscosification of CO2. Reduced mobility ratio improves sweep efficiency of injected CO2. Reduction in residual water saturation improves storage capacity. CO2 viscosification does not have appreciable effect on well injectivity.
Viscosification of CO2 to improve subsurface storage — A modeling study
Moortgat, Joachim (Autor:in) / Firoozabadi, Abbas (Autor:in)
06.09.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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