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Experimental and numerical simulation of supercritical CO2 microbubble injection into a brine-saturated porous medium
Graphical abstract Display Omitted
Highlights Mapping of supercritical CO2 microbubbles injection to brine-saturated sandstone. Microbubbles delayed breakthrough and increase sweep efficiency. Numerical simulation reproduction with capillary pressure−porosity based method.
Abstract Microbubbles are one solution to the channeling problem in the displacement process through porous media. However, applications of microbubbles to geological carbon sequestration (GCS) is scarcely reported. In this work, we injected supercritical CO2 (scCO2) into brine-saturated sandstone and mapped the displacement process by medical computed tomography (CT). The injections were performed by two methods: an analog of a regular drainage process and a special injection module incorporating microbubble injection. The microbubble injection increased the scCO2 saturation, which corresponds to the sweep efficiency, by alleviating the channeling effect. We then investigated the microbubble injection in numerical simulations and gained insights into the injection mechanism. Both injection processes were reasonably produced by assigning the sub-core permeability approximation with the porosity−capillary pressure approach (). Based on these results, we attributed the macroscale effects of microbubble injection to the lowered entry capillary pressure.
Experimental and numerical simulation of supercritical CO2 microbubble injection into a brine-saturated porous medium
Graphical abstract Display Omitted
Highlights Mapping of supercritical CO2 microbubbles injection to brine-saturated sandstone. Microbubbles delayed breakthrough and increase sweep efficiency. Numerical simulation reproduction with capillary pressure−porosity based method.
Abstract Microbubbles are one solution to the channeling problem in the displacement process through porous media. However, applications of microbubbles to geological carbon sequestration (GCS) is scarcely reported. In this work, we injected supercritical CO2 (scCO2) into brine-saturated sandstone and mapped the displacement process by medical computed tomography (CT). The injections were performed by two methods: an analog of a regular drainage process and a special injection module incorporating microbubble injection. The microbubble injection increased the scCO2 saturation, which corresponds to the sweep efficiency, by alleviating the channeling effect. We then investigated the microbubble injection in numerical simulations and gained insights into the injection mechanism. Both injection processes were reasonably produced by assigning the sub-core permeability approximation with the porosity−capillary pressure approach (). Based on these results, we attributed the macroscale effects of microbubble injection to the lowered entry capillary pressure.
Experimental and numerical simulation of supercritical CO2 microbubble injection into a brine-saturated porous medium
Patmonoaji, Anindityo (Autor:in) / Zhang, Yi (Autor:in) / Xue, Ziqiu (Autor:in) / Park, Hyuck (Autor:in) / Suekane, Tetsuya (Autor:in)
08.09.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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