CO2 Trapping in Layered Porous Media by Effective Viscosification

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dc.citation.articleNumbere2024WR037819en_US
dc.citation.issueNumber12en_US
dc.citation.journalTitleWater Resources Researchen_US
dc.citation.volumeNumber60en_US
dc.contributor.authorDing, Boxinen_US
dc.contributor.authorKantzas, Apostolosen_US
dc.contributor.authorFiroozabadi, Abbasen_US
dc.date.accessioned2025-01-09T20:16:56Zen_US
dc.date.available2025-01-09T20:16:56Zen_US
dc.date.issued2024en_US
dc.description.abstractSafe and efficient storage of CO2 in saline aquifers requires mobility control to prevent CO2 from accumulation and rapid spreading at the formation top below the caprock. In the past, we have demonstrated the effectiveness of two engineered olefinic-based oligomers for viscosification of sc-CO2 and the significant improvements in residual trapping of sc-CO2 in brine-saturated homogeneous sandstone cores (Ding et al., 2024, https://doi.org/10.2118/214842-pa). The objective of this work is to examine the sweep efficiency and residual brine saturation in the layered cores by effective viscosification with two engineered molecules, providing the implications for CO2 trapping in layered porous media by effective viscosification. In neat CO2 injection, the CO2 channels through the high permeability layer, causing rapid breakthrough and high residual brine saturation. This results in an inefficient process for CO2 storage in saline aquifers. In viscosified CO2 injection, we observe significant improvements in crossflow at the interface between the two-permeability layer, partly due to the mobility control and residual brine saturation reduction. In comparison to the neat CO2 injection, the synergistic effect of the mobility control and increases in interfacial elasticity by injection of vis-CO2 results in delay in breakthrough by a factor of 2 and about 95% higher brine production. Compared to our previous work on displacement experiments in homogeneous sandstone core, there is a more significant reduction of residual brine saturation in layered cores by viscosified CO2 injection. Increases in injection rate is also demonstrated to improve the CO2 storage in layered cores. Both the CO2 viscosification and increases in injection rate may promote the injection pressure to overcome the capillary entry pressure, leading to CO2 displacement of brine in the low-permeability layer. CT-imaging data advances understanding of boundary conditions, brine production, and local residual brine saturation in layered cores.en_US
dc.identifier.citationDing, B., Kantzas, A., & Firoozabadi, A. (2024). CO2 Trapping in Layered Porous Media by Effective Viscosification. Water Resources Research, 60(12), e2024WR037819. https://doi.org/10.1029/2024WR037819en_US
dc.identifier.digitalCO2TrappingLayeredPorousMediaen_US
dc.identifier.doihttps://doi.org/10.1029/2024WR037819en_US
dc.identifier.urihttps://hdl.handle.net/1911/118099en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.subject.keywordCO2 viscosificationen_US
dc.subject.keywordsaturation profileen_US
dc.subject.keywordX-ray CTen_US
dc.subject.keywordcarbon sequestrationen_US
dc.subject.keywordmobility controlen_US
dc.titleCO2 Trapping in Layered Porous Media by Effective Viscosificationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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