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dc.contributor.authorQiao, Tian
dc.contributor.authorHoteit, Hussein
dc.contributor.authorFahs, Marwan
dc.date.accessioned2021-05-03T07:11:42Z
dc.date.available2021-05-03T07:11:42Z
dc.date.issued2021-04-25
dc.date.submitted2021-02-26
dc.identifier.citationQiao, T., Hoteit, H., & Fahs, M. (2021). Semi-Analytical Solution to Assess CO2 Leakage in the Subsurface through Abandoned Wells. Energies, 14(9), 2452. doi:10.3390/en14092452
dc.identifier.issn1996-1073
dc.identifier.doi10.3390/en14092452
dc.identifier.urihttp://hdl.handle.net/10754/669047
dc.description.abstractGeological carbon storage is an effective method capable of reducing carbon dioxide (CO2) emissions at significant scales. Subsurface reservoirs with sealing caprocks can provide long-term containment for the injected fluid. Nevertheless, CO2 leakage is a major concern. The presence of abandoned wells penetrating the reservoir caprock may cause leakage flow-paths for CO2 to the overburden. Assessment of time-varying leaky wells is a need. In this paper, we propose a new semi-analytical approach based on pressure-transient analysis to model the behavior of CO2 leakage and corresponding pressure distribution within the storage site and the overburden. Current methods assume instantaneous leakage of CO2 occurring with injection, which is not realistic. In this work, we employ the superposition in time and space to solve the diffusivity equation in 2D radial flow to approximate the transient pressure in the reservoirs. Fluid and rock compressibilities are taken into consideration, which allow calculating the breakthrough time and the leakage rate of CO2 to the overburden accurately. We use numerical simulations to verify the proposed time-dependent semi-analytical solution. The results show good agreement in both pressure and leakage rates. Sensitivity analysis is then conducted to assess different CO2 leakage scenarios to the overburden. The developed semi-analytical solution provides a new simple and practical approach to assess the potential of CO2 leakage outside the storage site. This approach is an alternative to numerical methods when detailed simulations are not feasible. Furthermore, the proposed solution can also be used to verify numerical codes, which often exhibit numerical artifacts.
dc.description.sponsorshipThe authors thank Computer Modelling Group (CMG) Ltd. for providing the academic license of CMG simulators to the King Abdullah University of Science and Technology (KAUST).
dc.publisherMDPI AG
dc.relation.urlhttps://www.mdpi.com/1996-1073/14/9/2452
dc.relation.urlhttps://www.mdpi.com/1996-1073/14/9/2452/pdf
dc.rightsArchived with thanks to Energies
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCO2 storage
dc.subjectCCS
dc.subjectanalytical solution
dc.subjectleakage
dc.subjectpressure transient analysis
dc.subjectabandoned wells
dc.titleSemi-Analytical Solution to Assess CO2 Leakage in the Subsurface through Abandoned Wells
dc.typeArticle
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
dc.contributor.departmentEnergy Resources & Petroleum Engineering
dc.contributor.departmentEnergy Resources and Petroleum Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalEnergies
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionInstitut Terre et Environnement de Strasbourg, Université de Strasbourg, CNRS, ENGEES, UMR 7063, 67081 Strasbourg, France
dc.identifier.volume14
dc.identifier.issue9
dc.identifier.pages2452
kaust.personQiao, Tian
kaust.personHoteit, Hussein
dc.date.accepted20201-04-12
refterms.dateFOA2021-05-03T07:12:10Z


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