• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2019 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2019 - 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

    Effects of conductive well casings on electromagnetic surveys: experimental studies and numerical modelling, The

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Anderson_mines_0052N_11759.pdf
    Size:
    3.195Mb
    Format:
    PDF
    Download
    Author
    Anderson, Ethan Cole
    Advisor
    Swidinsky, Andrei
    Date issued
    2019
    Keywords
    experimental
    petroleum
    electromagnetics
    well casings
    geophysics
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/173094
    Abstract
    Controlled source electromagnetic (CSEM) surveys can be used in petroleum exploration to supplement seismic reflection data because electrical resistivity is highly sensitive to pore space fluid content. Traditionally, CSEM has been used in greenfields exploration, but the method has the potential for application later in the life of a producing field. However, such monitoring would be performed in the presence of electrically conductive steel infrastructure, such as well casings and pipelines. These features introduce considerable artifacts into data gathered for development, production and monitoring purposes. Numerical techniques can be used to model and remove the electromagnetic response from steel infrastructure; one such is the Method of Moments (MoM), which is being actively developed at Mines and will be used throughout this thesis to support experimental data. Although characterizing the effects of steel infrastructure on EM data is of ultimate interest to industry, much can be learned by studying the zero-frequency DC resistivity counterpart of the finite frequency (AC) problem. Throughout this thesis I theoretically examine the relationship between EM data and well casing properties to best design proper experiments at the lab and field scales. In particular, I examine the relationships between the casing response and properties such as length, width, wall thickness and material composition of the casing. I then describe experimental DC resistivity data that I have collected at three scales: lab, mid-, and large-scale and compare results to those predicted by MoM. Modelled responses in zones dominated by the casing response show differences of less than 20% when compared with experimental data, providing confidence in the MoM method. Results show that the most important parameters affecting casing responses are the orientation of the casing with respect to survey geometry, total volume of metal present in the casing, and the casing material - an important finding as industry casings vary extensively in physical properties. Finally, I discuss a series of AC modelling tests conducted at the same three scales to understand the viability of further EM experiments. Results indicate that at the mid-scale and large-scale, such experiments should be possible using transmitting frequencies of 50 kHz and 1 kHz, respectively; however, lab-scale tests will require transmitting frequencies too high for standard EM equipment.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2019 - 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.