Geomechanical Modeling of Underground Coal Gasification

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atmire.migration.oldid4925
dc.contributor.advisorChen, Zhangxing (John)
dc.contributor.advisorNassir, Mohammad
dc.contributor.authorElahi, Seyed Moein
dc.contributor.committeememberPereira Almao, Pedro
dc.contributor.committeememberLines, Laurence
dc.date.accessioned2016-09-19T22:15:28Z
dc.date.available2016-09-19T22:15:28Z
dc.date.issued2016
dc.date.submitted2016en
dc.description.abstractThe geomechanical responses of a coal seam and its surrounding strata in underground coal gasification (UCG) are significant owing to the high temperature nature of the UCG process and the cavity evolution. In this thesis, the results from a reservoir simulator are coupled with a geomechanical module to solve for the displacement and stress variations. A controlled retracting injection point (CRIP) method is applied in the reservoir simulator to model reactions and geochemistry. The stress solution results of some UCG example problems are discussed by applying three constitutive models of linear elastic, hyperbolic, and elasto-plastic. In a simpler method, shear softening and post-failure behavior of the coal is captured by imposing the stress rebalancing on the linear elastic model to mimic the elasto-plastic solution. Finally, the two compelling factors of high temperature and cavity evolution, which have the highest contributions to the geomechanical responses, are comprehensively investigated in different sensitivity analyses.en_US
dc.identifier.citationElahi, S. M. (2016). Geomechanical Modeling of Underground Coal Gasification (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/26286en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/26286
dc.identifier.urihttp://hdl.handle.net/11023/3312
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectEnergy
dc.subjectEngineering--Chemical
dc.subjectEngineering--Environmental
dc.subjectEngineering--Mechanical
dc.subjectEngineering--Petroleum
dc.subjectGeotechnology
dc.subjectEngineering--Operations Research
dc.subject.classificationUnderground coal gasification (UCG)en_US
dc.subject.classificationGeomechanicsen_US
dc.subject.classificationCavityen_US
dc.subject.classificationCouplingen_US
dc.subject.classificationThermalen_US
dc.subject.classificationConstitutive modelen_US
dc.titleGeomechanical Modeling of Underground Coal Gasification
dc.typemaster thesis
thesis.degree.disciplineChemical and Petroleum Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
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