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• W2890874512 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Effects of completion design on electrically stimulated casing and its 3D responseAuthors: Chester J. WeissEvan UmMichael WiltChester J. WeissSandia National LaboratoriesSearch for more papers by this author, Evan UmLawrence Berkeley National LaboratorySearch for more papers by this author, and Michael WiltLawrence Berkeley National LaboratorySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2992772.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractTo better understand the factors contributing to electromagentic (EM) observables in developed field sites, we examine in detail through finite element analysis the specific effects of casing completion design. The presense of steel casing has long been exploited for improved subsurface interrogation and there is growing interest in remote methods for assessing casing integrity accross a range of geophysical scenarios related to resource development and sequestration/storage activities. Accurate modeling of the casing response to EM stimulation is recognized as relevant, and a difficult computational challenge because of the casing’s high conductivity contrast with geomaterials and its relatively small volume fraction over the field scale. We find that casing completion design can have a significant effect on the observed EM fields, especially at zero frequency. This effect appears to originate in the capacitive coupling between inner production casing and the outer surface casing. Furthermore we show that an equivalent ‘effective conductivity’ for the combined surface/production casing system is inadequate for replicating this effect, regardless of whether the casings are grounded to one another or not. Lastly, we show that in situations where this coupling can be ignored and knowledge of casing currents is not required, simplifying the casing as a perfectly conducting line can be an effective strategy for reducing the computational burden in modeling field–scale response.Presentation Date: Tuesday, October 16, 2018Start Time: 1:50:00 PMLocation: 213A (Anaheim Convention Center)Presentation Type: OralKeywords: borehole geophysics, completion, electrical/resistivity, electromagnetics, finite elementPermalink: https://doi.org/10.1190/segam2018-2992772.1FiguresReferencesRelatedDetailsCited byInsights on electromagnetic scattering by steel casings in surface-to-borehole and borehole-to-surface methodsNestor H. Cuevas1 February 2022 | The Leading Edge, Vol. 41, No. 2The effects of well damage and completion designs on geoelectrical responses in mature wellbore environmentsGungor D. Beskardes, Chester J. Weiss, Evan Um, Michael Wilt, and Kris MacLennan24 September 2021 | GEOPHYSICS, Vol. 86, No. 6An approximate inversion scheme for surface-borehole electromagnetic in the presence of steel casing: 1D implementationNestor H. Cuevas4 February 2021 | GEOPHYSICS, Vol. 86, No. 23D borehole-to-surface and surface electromagnetic modeling and inversion in the presence of steel infrastructureEvan Schankee Um, Jihoon Kim, and Michael Wilt6 July 2020 | GEOPHYSICS, Vol. 85, No. 5A Fast Numerical Method for the Galvanic Measurement in Hydraulic Fracture DetectionIEEE Transactions on Antennas and Propagation, Vol. 68, No. 2Case histories applying top-casing electrodes and surface based EM fields for well integrity mappingMichael Wilt, Evan Um, Kris MacLennan, Chester Weiss, and Bescardes Didem Gungor10 August 2019Integral equation method for the subsurface sensing applications with wire-to-surface junction structures in layered mediaShubin Zeng and Jiefu Chen10 August 2019Data and modeling results from depth to surface electromagnetic surveys with multiple nearby metallic casings and underground pipelinesGreg Nieuwenhuis, Kris MacLennan, Honglin Yuan, and Evan Schankee Um27 August 2018 SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Chester J. Weiss, Evan Um, and Michael Wilt, (2018), Effects of completion design on electrically stimulated casing and its 3D response, SEG Technical Program Expanded Abstracts : 873-877. https://doi.org/10.1190/segam2018-2992772.1 Plain-Language Summary Keywordsborehole geophysicscompletionelectrical/resistivityelectromagneticsfinite elementPDF DownloadLoading ..." @default.
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