Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/117499
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dc.contributor.authorYou, Z.en
dc.contributor.authorBadalyan, A.en
dc.contributor.authorYang, Y.en
dc.contributor.authorBedrikovetsky, P.en
dc.contributor.authorHand, M.en
dc.date.issued2019en
dc.identifier.citationGeothermics, 2019; 77:344-367en
dc.identifier.issn0375-6505en
dc.identifier.issn1879-3576en
dc.identifier.urihttp://hdl.handle.net/2440/117499-
dc.description.abstractFines migration with consequent well productivity reduction is a well-known phenomenon occurring during exploitation of geothermal reservoirs. Laboratory corefloods with piecewise constant decreasing ionic strength have been performed with measurements of the pressure drop along the core and the accumulated effluent particle concentration. The tests were performed under ambient conditions with further results re-calculation for high geothermal temperatures. Permeability stabilises after injection of numerous pore volumes, suggesting slow drift of mobilised particles if compared with the carrier water velocity. SEM-EDX analysis of the produced fine particles shows that kaolinite and illite/chlorite are the major minerals responsible for the permeability damage. The competitive effects of decreasing water viscosity and weakening electrostatic attraction on the attached particle concentration during temperature increase have been observed. The micro modelling of the fine particle mechanical equilibrium shows that the electrostatic attraction effect on the fines attachment dominates. It results in increased fines detachment and permeability decline at high temperatures, suggesting that geothermal fields are more susceptible for fines migration formation damage than the conventional oilfields and aquifers. A new “ionic strength- velocity” translation procedure is developed for determining velocity dependency of the maximum retention function from laboratory coreflood tests with varying ionic strength. Experiment-based evaluation of velocity- and temperature-dependencies on the maximum retention function is demonstrated for specific conditions of geothermal resevoirs. We discuss well inflow performance with fines migration, and derive an exact solution for axi-symmetric water-flow towards the well. The solution includes explicit formulae for attached, suspended and strained fines, and well productivity. The analytical model along with the obtained laboratory data allows successful matching of the well discharge history (Salamander geothermal field, Australia).en
dc.description.statementofresponsibilityZ. You, A. Badalyan, Y. Yang, P. Bedrikovetsky, M. Handen
dc.language.isoenen
dc.publisherElsevieren
dc.rights© 2018 Elsevier Ltd. All rights reserved.en
dc.subjectGeothermal; permeability reduction; formation damage; fines migration; ionic strength sensitivity; maximum retention functionen
dc.titleFines migration in geothermal reservoirs: laboratory and mathematical modellingen
dc.typeJournal articleen
dc.identifier.rmid0030102316en
dc.identifier.doi10.1016/j.geothermics.2018.10.006en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP1094299en
dc.relation.granthttp://purl.org/au-research/grants/arc/LP100100613en
dc.relation.granthttp://purl.org/au-research/grants/arc/LP110200799en
dc.identifier.pubid446343-
pubs.library.collectionAustralian School of Petroleum publicationsen
pubs.library.teamDS14en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidBadalyan, A. [0000-0003-1130-6083]en
dc.identifier.orcidHand, M. [0000-0003-3743-9706]en
Appears in Collections:Australian School of Petroleum publications

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