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- W3215764265 abstract "The risk of CO2 leakage must be considered during the planning, injection and monitoring stages of a Carbon Capture and Storage (CCS) operation in order to meet regulatory standards. Various strategies can be used to reduce the risk of a CO2 leak including forming hydraulic barriers, permanent cement- or reactive-barriers, which include the use of chemical reagents that react upon contact with CO2 to form a geochemical barrier. Solutions of concentrated sodium silicate, an industrial by-product, have been proposed as a promising reagent for producing geochemical barriers under CO2 storage conditions. Interaction of CO2 with this reagent leads to the rapid formation of an amorphous silica gel that can form a barrier to reduce permeability in a reservoir [1-2]. To investigate the formation of the silica gel barrier under CO2 storage conditions, we combine laboratory work and numerical modelling. Here we present the results of reagent optimization from flow through column experiments at ambient conditions using an unconsolidated quartz sand. Multi-phase core flooding experiments were performed at reservoir conditions to assess the associated reduction in the permeability of a typical sandstone reservoir rock (Berea Sandstone) and the stability of the gel and barrier formed over time [3]. Finally, reactive transport modelling of the experiments was conducted using TOUGHREACT, with modifications made to the thermodynamic database to account for the properties of the amorphous silica gel, which forms under CO2 storage conditions." @default.
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- W3215764265 date "2019-01-01" @default.
- W3215764265 modified "2023-09-23" @default.
- W3215764265 title "Performance of Silica-Gel as a Geochemical Barrier Under CO2 Storage Conditions" @default.
- W3215764265 doi "https://doi.org/10.2139/ssrn.3365815" @default.
- W3215764265 hasPublicationYear "2019" @default.
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