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dc.contributor.authorAlcorn, Zachary Paul
dc.contributor.authorFredriksen, Sunniva
dc.contributor.authorSharma, Mohan
dc.contributor.authorFøyen, Tore Lyngås
dc.contributor.authorWergeland, Connie
dc.contributor.authorFernø, Martin
dc.contributor.authorGraue, Arne
dc.contributor.authorErsland, Geir
dc.PublishedE3S Web of Conferences. 2020, 146 1-12.
dc.description.abstractThis paper presents experimental and numerical sensitivity studies to assist injection strategy design for an ongoing CO2 foam field pilot. The aim is to increase the success of in-situ CO2 foam generation and propagation into the reservoir for CO2 mobility control, enhanced oil recovery (EOR) and CO2 storage. Un-steady state in-situ CO2 foam behavior, representative of the near wellbore region, and steady-state foam behavior was evaluated. Multi-cycle surfactant-alternating gas (SAG) provided the highest apparent viscosity foam of 120.2 cP, compared to co-injection (56.0 cP) and single-cycle SAG (18.2 cP) in 100% brine saturated porous media. CO2 foam EOR corefloods at first-contact miscible (FCM) conditions showed that multi-cycle SAG generated the highest apparent foam viscosity in the presence of refined oil (n-Decane). Multi-cycle SAG demonstrated high viscous displacement forces critical in field implementation where gravity effects and reservoir heterogeneities dominate. At multiple-contact miscible (MCM) conditions, no foam was generated with either injection strategy as a result of wettability alteration and foam destabilization in presence of crude oil. In both FCM and MCM corefloods, incremental oil recoveries were on average 30.6% OOIP regardless of injection strategy for CO2 foam and base cases (i.e. no surfactant). CO2 diffusion and miscibility dominated oil recovery at the core-scale resulting in high microscopic CO2 displacement. CO2 storage potential was 9.0% greater for multi-cycle SAGs compared to co-injections at MCM. A validated core-scale simulation model was used for a sensitivity analysis of grid resolution and foam quality. The model was robust in representing the observed foam behavior and will be extended to use in field scale simulations.en_US
dc.publisherEDP Openen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleCore-scale sensitivity study of CO2 foam injection strategies for mobility control, enhanced oil recovery, and CO2 storageen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright The Authorsen_US
dc.source.journalE3S Web of Conferencesen_US
dc.relation.projectNorges forskningsråd: 249742en_US
dc.identifier.citationE3S Web of Conferences. 2020, 146, 02002.en_US

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