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Improvement in CO2 geo-sequestration in saline aquifers by viscosification: From molecular scale to core scale
Highlights An effective oligomer of 1-decene is investigated for efficient CO2 storage. Low adsorption of oligomer is shown by atomistic simulations and coreflood experiments. CO2 viscosification leads to significant delay in breakthrough and lower residual brine saturation.
Abstract Carbon dioxide (CO2) storage in the subsurface is a viable approach to mitigate climate change by reducing anthropogenic greenhouse gas emissions. The unfavorable mobility ratio in brine displacement by CO2 would lead to poor sweep efficiency. In this investigation, the efficiency of an engineered CO2 oligomer viscosifier with about twenty repeat units of 1-decene is evaluated in mobility control and sweep efficiency improvement in drainage. We have performed brine displacement experiments in sandstone rock with supercritical CO2. The viscosifier at 1.5 wt% concentration increases the viscosity of supercritical CO2 by 4.8 folds at pressure of 3500 psi and temperature of 194 ˚F. We observe significant delay of CO2 breakthrough time by 2.6 ± 0.1 folds in a large number of experiments by viscosified CO2. The molecule does not have appreciable adsorption on the rock surface. The pressure drop from displacement of neat CO2 by viscosified CO2 at 1 PV injection provides the evidence of low adsorption. Molecular simulations are conducted to investigate adsorption. Low adsorption is a key measure of the effectiveness of the molecule. The results from molecular simulations agree with the experiments. In addition to viscosification, the novelty of the molecule is that there is a significant decrease in the residual brine saturation. Consequently, the residual trapping is also increased. The combination of decrease in residual brine saturation, and mobility control are expected to significantly improve the storage capacity through increase in residual trapping and sweep efficiency in CO2 storage in saline aquifers. As a result, CO2 storage may become more efficient.
Graphical abstract Efficient CO2 storage in saline aquifers by viscosification by an oligomer of 1-decene with about twenty repeat units. Display Omitted
Improvement in CO2 geo-sequestration in saline aquifers by viscosification: From molecular scale to core scale
Highlights An effective oligomer of 1-decene is investigated for efficient CO2 storage. Low adsorption of oligomer is shown by atomistic simulations and coreflood experiments. CO2 viscosification leads to significant delay in breakthrough and lower residual brine saturation.
Abstract Carbon dioxide (CO2) storage in the subsurface is a viable approach to mitigate climate change by reducing anthropogenic greenhouse gas emissions. The unfavorable mobility ratio in brine displacement by CO2 would lead to poor sweep efficiency. In this investigation, the efficiency of an engineered CO2 oligomer viscosifier with about twenty repeat units of 1-decene is evaluated in mobility control and sweep efficiency improvement in drainage. We have performed brine displacement experiments in sandstone rock with supercritical CO2. The viscosifier at 1.5 wt% concentration increases the viscosity of supercritical CO2 by 4.8 folds at pressure of 3500 psi and temperature of 194 ˚F. We observe significant delay of CO2 breakthrough time by 2.6 ± 0.1 folds in a large number of experiments by viscosified CO2. The molecule does not have appreciable adsorption on the rock surface. The pressure drop from displacement of neat CO2 by viscosified CO2 at 1 PV injection provides the evidence of low adsorption. Molecular simulations are conducted to investigate adsorption. Low adsorption is a key measure of the effectiveness of the molecule. The results from molecular simulations agree with the experiments. In addition to viscosification, the novelty of the molecule is that there is a significant decrease in the residual brine saturation. Consequently, the residual trapping is also increased. The combination of decrease in residual brine saturation, and mobility control are expected to significantly improve the storage capacity through increase in residual trapping and sweep efficiency in CO2 storage in saline aquifers. As a result, CO2 storage may become more efficient.
Graphical abstract Efficient CO2 storage in saline aquifers by viscosification by an oligomer of 1-decene with about twenty repeat units. Display Omitted
Improvement in CO2 geo-sequestration in saline aquifers by viscosification: From molecular scale to core scale
Afra, Salar (Autor:in) / Alhosani, Mohamed (Autor:in) / Firoozabadi, Abbas (Autor:in)
10.04.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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