• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2022 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2022 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Gas hydrate deposition & remediation during continuous/transient operations

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Pickarts_mines_0052E_12481.pdf
    Embargo:
    2023-11-04
    Size:
    7.524Mb
    Format:
    PDF
    Download
    Thumbnail
    Name:
    Pickarts_mines_0052E_316/Author ...
    Embargo:
    2023-11-04
    Size:
    5.790Mb
    Format:
    PDF
    Download
    Thumbnail
    Name:
    Pickarts_mines_0052E_316/Chapter ...
    Embargo:
    2023-11-04
    Size:
    1.351Mb
    Format:
    PDF
    Download
    Thumbnail
    Name:
    Pickarts_mines_0052E_316/Figure ...
    Embargo:
    2023-11-04
    Size:
    5.128Mb
    Format:
    PDF
    Download
    View more filesView fewer files
    Author
    Pickarts, Marshall A.
    Advisor
    Koh, Carolyn A. (Carolyn Ann)
    Zerpa, Luis E.
    Date issued
    2022
    Keywords
    coating
    deposition
    gas hydrates
    plugging
    surface treatment
    transient
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/15528
    Abstract
    Within hydrocarbon production, gas hydrates present a significant issue preventing safe and reliable operation. Plugs from these compounds develop within hours to days from jamming, agglomeration, and deposition processes. In particular, deposition comprises an outstanding and difficult subject to address due to the terminology’s broad coverage of various mechanisms, which include aggregate bedding, particle impingement, liquid splashing, and condensation. This thesis focuses on its potential mitigation with a surface treatment as well as its significance during transient shut-in/restart operations. Efforts began with a bench-scale evaluation of a smooth, omniphobic surface treatment on its interaction with multiple pipeline liquids and solids. A benchtop interfacial tensiometer, rocking cell, flowloop, and mechanical shear device demonstrated reduced/prevented wetting, deposition, formation, and adhesion of water, crude oil, gas hydrates, asphaltenes, and waxes. This work showed one surface treatment provided passive protection from multiple flow assurance issues. A scientific understanding of gas hydrate deposition prevention with the surface treatment ensued. Induction time, rocking cell, and flowloop trials highlighted surface roughness/energy controlling effects on gas hydrate nucleation, condensation-driven growth, and aggregate deposition. For optimal prevention, treatments required both smoothened and low energy features, which reduced physical/chemical interactions between fluids and the wall. Next, the surface treatment application scaled to a laboratory flowloop for transient oil-dominated gas hydrate experiments. Baseline tests displayed a prevalence of aggregate bedding. High volume, low conversion deposits, which formed rapidly after cold restart, dominated plugging. Then, application of the omniphobic surface treatment to only 15% of the flowline rectified this problem. The system avoided significant stenosis and thus plugging. The surface treatment successfully scaled to fully flow systems, matching results from benchtop apparatuses. Further transient gas hydrate experimentation transpired on a pilot-scale flowloop with an attached riser. Despite the different setup, analogous plugging mechanisms to the baseline lab-scale flowloop trials occurred. A bedding-based deposition process controlled plugging. Furthermore, possible severe slugging in the riser arose and perpetuated due to the presence of the solid slurry. The riser’s presence emphasized the importance of geometry in laboratory testing setups. Lastly, collected flowloop observations combined with research from key operators and academic groups to generate a conceptual picture for gas hydrate plugging during transient operations. This illustration created a basis for the unresolved modeling efforts of these scenarios. Overall, the scientific impact of this work emanates from identifying the wall features preventing gas hydrate formation/deposition, connecting solids presence to possible severe slugging, and developing a novel illustration of gas hydrate plugging through deposition during pipeline restart. This information aids researchers in the design of future surface treatment formulations for desired gas hydrate formation and deposition prevention properties. Furthermore, once directly verified, it presents a previously unknown expansion to the envelope of severe slugging occurrence by considering gas hydrates. The thesis work ends by formulating a modeling pathway during highly-complex transient flow conditions for predictive tools. Though each area involved the first recorded instance of such descriptions, the general conclusions applied broadly enough to appropriate scenarios to extend beyond the limited conditions shown in this thesis.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2022 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated 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.

    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.