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dc.contributor.authorLei, L.
dc.contributor.authorSantamarina, Carlos
dc.date.accessioned2018-04-16T11:27:43Z
dc.date.available2018-04-16T11:27:43Z
dc.date.issued2018-04-16
dc.identifier.citationLei L, Santamarina JC (2018) LABORATORY STRATEGIES FOR HYDRATE FORMATION IN FINE-GRAINED SEDIMENTS. Journal of Geophysical Research: Solid Earth. Available: http://dx.doi.org/10.1002/2017jb014624.
dc.identifier.issn2169-9313
dc.identifier.doi10.1002/2017jb014624
dc.identifier.urihttp://hdl.handle.net/10754/627519
dc.description.abstractFine-grained sediments limit hydrate nucleation, shift the phase boundary and hinder gas supply. Laboratory experiments in this study explore different strategies to overcome these challenges, including the use of a more soluble guest molecule rather than methane, grain-scale gas-storage within porous diatoms, ice-to-hydrate transformation to grow lenses at predefined locations, forced gas injection into water saturated sediments, and long-term guest molecule transport. Tomographic images, thermal and pressure data provide rich information on hydrate formation and morphology. Results show that hydrate formation is inherently displacive in fine-grained sediments; lenses are thicker and closer to each other in compressible, high specific surface area sediments subjected to low effective stress. Temperature and pressure trajectories follow a shifted phase boundary that is consistent with capillary effects. Exo-pore growth results in freshly formed hydrate with a striped and porous structure; this open structure becomes an effective pathway for gas transport to the growing hydrate front. Ice-to-hydrate transformation goes through a liquid stage at pre-melt temperatures; then, capillarity and cryogenic suction compete, and some water becomes imbibed into the sediment faster than hydrate reformation. The geometry of hydrate lenses and the internal hydrate structure continue evolving long after the exothermal response to hydrate formation has completely decayed. Multiple time-dependent processes occur during hydrate formation, including gas, water and heat transport, sediment compressibility, reaction rate and the stochastic nucleation process. Hydrate formation strategies conceived for this study highlight the inherent difficulties in emulating hydrate formation in fine-grained sediments within the relatively short time-scale available for laboratory experiments.
dc.description.sponsorshipSeth Mallett helped in the execution of various experiments conducted as part of this study. Gabrielle Abelskamp edited earlier versions of this manuscript. Support for this research was provided by the USA Department of Energy, the Goizueta Foundation and the KAUST endowment. All the experimental data used in this article are available in Lei’s PhD thesis [Lei, 2017].
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JB014624
dc.rightsArchived with thanks to Journal of Geophysical Research: Solid Earth
dc.subjectfine-grained sediments
dc.subjecthydrate formation
dc.subjectcapillarity
dc.subjectwater migration
dc.subjectcryogenic suction
dc.subjectsegregated morphology
dc.subjectporous hydrate
dc.subjectmicro-CT
dc.titleLABORATORY STRATEGIES FOR HYDRATE FORMATION IN FINE-GRAINED SEDIMENTS
dc.typeArticle
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentEnergy Resources and Petroleum Engineering
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Geophysical Research: Solid Earth
dc.eprint.versionPost-print
dc.contributor.institutionNational Energy Technology Laboratory; U.S. Department of Energy; Morgantown WV
kaust.personSantamarina, Carlos
refterms.dateFOA2018-06-14T04:21:06Z
dc.date.published-online2018-04-16
dc.date.published-print2018-04


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