• Login
    View Item 
    •   Home
    • Research
    • Articles
    • View Item
    •   Home
    • Research
    • Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of KAUSTCommunitiesIssue DateSubmit DateThis CollectionIssue DateSubmit Date

    My Account

    Login

    Quick Links

    Open Access PolicyORCID LibguideTheses and Dissertations LibguideSubmit an Item

    Statistics

    Display statistics

    LABORATORY STRATEGIES FOR HYDRATE FORMATION IN FINE-GRAINED SEDIMENTS

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Lei_et_al-2017-Journal_of_Geophysical_Research.pdf
    Size:
    1.277Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Download
    Type
    Article
    Authors
    Lei, L.
    Santamarina, Carlos cc
    KAUST Department
    Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
    Earth Science and Engineering Program
    Energy Resources and Petroleum Engineering
    Physical Science and Engineering (PSE) Division
    Date
    2018-04-16
    Online Publication Date
    2018-04-16
    Print Publication Date
    2018-04
    Permanent link to this record
    http://hdl.handle.net/10754/627519
    
    Metadata
    Show full item record
    Abstract
    Fine-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.
    Citation
    Lei 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.
    Sponsors
    Seth 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].
    Publisher
    American Geophysical Union (AGU)
    Journal
    Journal of Geophysical Research: Solid Earth
    DOI
    10.1002/2017jb014624
    Additional Links
    https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JB014624
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017jb014624
    Scopus Count
    Collections
    Articles; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

    entitlement

     
    DSpace software copyright © 2002-2022  DuraSpace
    Quick Guide | Contact Us | KAUST University Library
    Open Repository is a service hosted by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. For anonymous users the allowed maximum amount is 50 search results.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.