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Gas content derivative data versus diffusion coefficient

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dc.contributor.authorRodrigues, Cristina
dc.contributor.authorDinis, Maria Alzira Pimenta
dc.contributor.authorLemos de Sousa, M. J.
dc.date.accessioned2019-09-16T08:31:18Z
dc.date.available2019-09-16T08:31:18Z
dc.date.issued2016
dc.descriptionhttp://sherpa.ac.uk/romeo/issn/0144-5987/pt_PT
dc.description.abstractThe study of the gas diffusion process has a main role in both Coalbed Methane (CBM) production and CO2 injection in geological sequestration projects. The accurate determination of gas diffusion coefficients in unconventional reservoirs such as coal seams, requires a consistent mathematical approach. The study of the gas diffusion process in coal seams was carried out using sorption isotherms. The Langmuir model for individual gases and the extended Langmuir model for multicomponent gas mixtures were applied to fit sorption isotherm data. “Gas content derivative data” and “gas content changes” emerged as crucial mathematical parameters to accurately study the gas diffusion process. The main goal of this paper is to define the degree of interaction between the gas content derivative data and the gas diffusion process. Experiments were performed on three samples selected from two different coals, which were submitted to three different gas compositions, viz 99.999% CH4; 99.999% CO2; and a gas mixture containing 74.99% CH4 + 19.99% CO2 + 5.02% N2, at 35ºC, and at pressures ranging from 0 up to 50 bar. Experimental results obtained from the three samples indicate that during adsorption/desorption processes, the diffusion coefficients increase and the gas content changes decrease when the pressure decreases, due to the sample saturation degrees and to the kinetic mechanisms increase. Additionally, the “gas content derivative data” scattering is slightly lower during the desorption process than during the adsorption process. These behaviors are clearly identified when using methane, but are even more evident when using CO2 and the gas mixture, due to the CO2 interaction with coal porous structure, which induces a considerable resistance to CO2 release. The results show that sample B (CH4 + CO2 + N2) displays higher diffusion coefficient values (this behaviour is mainly related to the presence of N2) than sample C (CH4) and than Sample A (CO2).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAPA: Rodrigues, C. F., Dinis, M. A. P., & Lemos de Sousa, M. J. (2016). Gas Content Derivative Data Versus Diffusion Coefficient. Energy Exploration & Exploitation, 34(4), 606-620. doi:10.1177/0144598716643629pt_PT
dc.identifier.doi10.1177/0144598716643629pt_PT
dc.identifier.issn2048-4054
dc.identifier.urihttp://hdl.handle.net/10284/7900
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSAGE Publishingpt_PT
dc.relation.publisherversionhttps://journals.sagepub.com/doi/10.1177/0144598716643629pt_PT
dc.subjectDiffusion coefficientpt_PT
dc.subjectGas contentpt_PT
dc.subjectSorptionpt_PT
dc.subjectInflection pointpt_PT
dc.subjectTangent slopept_PT
dc.subjectDerivative datapt_PT
dc.subjectLangmuir modelpt_PT
dc.titleGas content derivative data versus diffusion coefficientpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage620pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage606pt_PT
oaire.citation.titleEnergy Exploration and Exploitationpt_PT
oaire.citation.volume34pt_PT
person.familyNameRodrigues
person.familyNameDinis
person.familyNameLemos de Sousa
person.givenNameCristina Fernanda Alves
person.givenNameMaria Alzira Pimenta
person.givenNameManuel João
person.identifier493996
person.identifier493603
person.identifier.ciencia-id7419-A932-CEC5
person.identifier.ciencia-id4710-147D-FDAF
person.identifier.ciencia-idD513-C4C7-E740
person.identifier.orcid0000-0002-7616-6985
person.identifier.orcid0000-0002-2198-6740
person.identifier.orcid0000-0001-6527-6196
person.identifier.ridF-3309-2011
person.identifier.scopus-author-id55925912600
person.identifier.scopus-author-id55539804000
person.identifier.scopus-author-id6602492063
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication1e85592a-e8e2-4aea-bd8e-1007c94388c0
relation.isAuthorOfPublication580f4519-5525-4616-8174-c912b1a3c88f
relation.isAuthorOfPublication.latestForDiscovery0fefd103-d5e6-455d-b7b7-06440a7f4229

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