Use of high-frequency electromagnetic waves for mapping an in situ coal gasification burn front

Journal Article · Mon Jan 01 04:00:00 EST 1979 · In Situ; (United States)

OSTI ID:6056946

Davis, D T; Lytle, R J; Laine, E F

High-frequency electromagnetic waves transmitted between boreholes can be used to map the position of an underground coal gasification (UCG) burn front, as well as other geophysical anomalies. The technique uses transmitting and receiving antennas lowered down boreholes on either side of the gasified region. Results from the use of this technique in a UCG experiment show high resolution and close agreement with data from thermocouples. The depth and height of the burn front were easily determined and subsidence of overburden was also evident in the measurements. Several variations on the method were tried. This technique promises several advantages over other down-hole instrumentation: lower cost, better spatial coverage, and the ability to give measurements both during and after passage of the burn front. The UCG experiment also showed several improvements that could be made in the technique.

• Research Organization: Univ. of California, Livermore
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6056946
• Journal Information: In Situ; (United States), Journal Name: In Situ; (United States) Vol. 3:2; ISSN ISOMD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
COAL GASIFICATION
ELECTRICAL SURVEYS
ELECTROMAGNETIC RADIATION
ELECTROMAGNETIC SURVEYS
GASIFICATION
GEOPHYSICAL SURVEYS
GROUND SUBSIDENCE
IN-SITU GASIFICATION
IN-SITU PROCESSING
MEASURING INSTRUMENTS
PROCESSING
RADIATIONS
THERMOCHEMICAL PROCESSES