DocumentCode
890448
Title
Guided quasistatic fields in electromagnetic measurement-while-drilling
Author
Xia, M.Y. ; Chen, Z.Y.
Author_Institution
Inst. of Electron., Acad. Sinica, Beijing, China
Volume
29
Issue
7
fYear
1993
fDate
4/1/1993 12:00:00 AM
Firstpage
637
Lastpage
639
Abstract
The quasistatic fields of extremely low frequencies (ELF) employed to communicate from underground to the ground surface in the electromagnetic measurement-while-drilling (EM-MWD) system are investigated. Three types of well, the vertical well, directional well, and horizontal well are considered. Computed results are obtained for various parameters, including the operating frequencies and the Earth´s conductivities. It is demonstrated that long drill strings have a guiding effect which is advantageous to the data transmission.
Keywords
geophysical prospecting; geophysical techniques; waveguide theory; ELF; Earth´s conductivities; data transmission; directional well; electromagnetic measurement-while-drilling; extremely low frequencies; guided EM wave propagation; guided quasistatic fields; horizontal well; long drill strings; operating frequencies; types of well; vertical well; well logging;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19930426
Filename
211830
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