Electromagnetic Fields Due to a Loop Current in a CasedBorehole Surrounded by Uniform Whole Space

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Description

Precise evaluation of electromagnetic (EM) response in steel-cased borehole is an essential first step towards developing techniques for casing parameter evaluation, which would ultimately help evaluating the formation response. In this report we demonstrate a numerical scheme for accurately computing EM responses in cased borehole environment. For improved numerical accuracy we use explicit representations of the electromagnetic spectra inside the borehole, in the casing, and in the formation. Instead of conventional Hankel transform, FFT is used to improve the numerical accuracy. The FFT approach allows us to compute fields at positions very close to the source loop, including the center ... continued below

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10 pages

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Lee, K. H. & Song, Y. January 1998.

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Description

Precise evaluation of electromagnetic (EM) response in steel-cased borehole is an essential first step towards developing techniques for casing parameter evaluation, which would ultimately help evaluating the formation response. In this report we demonstrate a numerical scheme for accurately computing EM responses in cased borehole environment. For improved numerical accuracy we use explicit representations of the electromagnetic spectra inside the borehole, in the casing, and in the formation. Instead of conventional Hankel transform, FFT is used to improve the numerical accuracy. The FFT approach allows us to compute fields at positions very close to the source loop, including the center of the transmitter loop.

Physical Description

10 pages

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  • Other: DE00006446
  • Report No.: LBNL--42371
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/6446 | External Link
  • Office of Scientific & Technical Information Report Number: 6446
  • Archival Resource Key: ark:/67531/metadc694594

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  • January 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 4, 2016, 7:08 p.m.

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Lee, K. H. & Song, Y. Electromagnetic Fields Due to a Loop Current in a CasedBorehole Surrounded by Uniform Whole Space, report, January 1998; California. (digital.library.unt.edu/ark:/67531/metadc694594/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.