Electrical resistance tomography using steel cased boreholes as long electrodes

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Electrical resistance tomography (ERT) using multiple electrodes installed in boreholes has been shown to be useful for both site characterization and process monitoring. In some cases, however, installing multiple downhole electrodes is too costly (e.g., deep targets) or risky (e.g., contaminated sites). For these cases we have examined the possibility of using the steel casings of existing boreholes as electrodes. Several possibilities can be considered. The first case we investigated uses an array of steel casings as electrodes. This results in very few data and thus requires additional constraints to limit the domain of possible inverse solutions. Simulations indicate that ... continued below

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Daily, W; Newmark, R L & Ramirez, A July 20, 1999.

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Electrical resistance tomography (ERT) using multiple electrodes installed in boreholes has been shown to be useful for both site characterization and process monitoring. In some cases, however, installing multiple downhole electrodes is too costly (e.g., deep targets) or risky (e.g., contaminated sites). For these cases we have examined the possibility of using the steel casings of existing boreholes as electrodes. Several possibilities can be considered. The first case we investigated uses an array of steel casings as electrodes. This results in very few data and thus requires additional constraints to limit the domain of possible inverse solutions. Simulations indicate that the spatial resolution and sensitivity are understandably low but it is possible to coarsely map the lateral extent of subsurface processes such as steam floods. The second case uses an array of traditional point borehole electrodes combined with long-conductor electrodes (steel casings). Although this arrangement provides more data, in many cases it results in poor reconstructions of test targets. Results indicate that this method may hold promise for low resolution imaging where steel casings can be used as electrodes but the merits depend strongly on details of each application. Field tests using these configurations are currently being conducted.

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1.1 Megabytes pages

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  • 1999 Oil and Gas Conference; Technology Options for Producer Survival, Dallas, TX (US), 06/28/1999--06/30/1999

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  • Report No.: UCRL-JC-135091
  • Report No.: AC1005000
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 13930
  • Archival Resource Key: ark:/67531/metadc627494

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 20, 1999

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 16, 2016, 6:40 p.m.

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Daily, W; Newmark, R L & Ramirez, A. Electrical resistance tomography using steel cased boreholes as long electrodes, article, July 20, 1999; California. (digital.library.unt.edu/ark:/67531/metadc627494/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.