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
fDate :
4/1/1993 12:00:00 AM
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;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930426
