dc.contributor.author | Gauteplass, Jarand | |
dc.contributor.author | Almenningen, Stian | |
dc.contributor.author | Barth, Tanja | |
dc.contributor.author | Ersland, Geir | |
dc.date.accessioned | 2021-05-10T12:19:34Z | |
dc.date.available | 2021-05-10T12:19:34Z | |
dc.date.created | 2020-09-05T13:05:24Z | |
dc.date.issued | 2020 | |
dc.Published | Energies. 2020, 13:4511 1-13. | |
dc.identifier.issn | 1996-1073 | |
dc.identifier.uri | https://hdl.handle.net/11250/2754682 | |
dc.description.abstract | Successful geological sequestration of carbon depends strongly on reservoir seal integrity and storage capacity, including CO2 injection efficiency. Formation of solid hydrates in the near-wellbore area during CO2 injection can cause permeability impairment and, eventually, injectivity loss. In this study, flow remediation in hydrate-plugged sandstone was assessed as function of hydrate morphology and saturation. CO2 and CH4 hydrates formed consistently at elevated pressures and low temperatures, reflecting gas-invaded zones containing residual brine near the injection well. Flow remediation by methanol injection benefited from miscibility with water; the methanol solution contacted and dissociated CO2 hydrates via liquid water channels. Injection of N2 gas did not result in flow remediation of non-porous CO2 and CH4 hydrates, likely due to insufficient gas permeability. In contrast, N2 as a thermodynamic inhibitor dissociated porous CH4 hydrates at lower hydrate saturations (<0.48 frac.). Core-scale thermal stimulation proved to be the most efficient remediation method for near-zero permeability conditions. However, once thermal stimulation ended and pure CO2 injection recommenced at hydrate-forming conditions, secondary hydrate formation occurred aggressively due to the memory effect. Field-specific remediation methods must be included in the well design to avoid key operational challenges during carbon injection and storage. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | MDPI | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Hydrate Plugging and Flow Remediation during CO2 Injection in Sediments | en_US |
dc.type | Journal article | en_US |
dc.type | Peer reviewed | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright 2020 by the authors. | en_US |
dc.source.articlenumber | 4511 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.doi | 10.3390/en13174511 | |
dc.identifier.cristin | 1827522 | |
dc.source.journal | Energies | en_US |
dc.source.40 | 13:4511 | |
dc.relation.project | Norges forskningsråd: 255490 | en_US |
dc.identifier.citation | Energies. 2020, 13 (17), 4511. | en_US |
dc.source.volume | 13 | en_US |
dc.source.issue | 17 | en_US |