Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-06
1977-08-30
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01V 312, G01V 318
Patent
active
040457249
ABSTRACT:
The present invention is directed to a method for remotely mapping subterranean coal beds prior to and during in situ gasification operations. This method is achieved by emplacing highly directional electromagnetic wave transmitters and receivers in bore holes penetrating the coal beds and then mapping the anomalies surrounding each bore hole by selectively rotating and vertically displacing the directional transmitter in a transmitting mode within the bore hole, and thereafter, initiating the gasification of the coal at bore holes separate from those containing the transmitters and receivers and then utilizing the latter for monitoring the burn front as it progresses toward the transmitters and receivers.
REFERENCES:
patent: 2455941 (1948-12-01), Muskat et al.
patent: 3114875 (1963-12-01), Haagensen
patent: 3286163 (1966-11-01), Holser et al.
patent: 3412322 (1968-11-01), Unterberger
patent: 3412815 (1968-11-01), Holser et al.
Balanis Constantine A.
Fasching George E.
Shuck Lowell Z.
Carlson Dean E.
Hamel Stephen D.
Larcher Earl L.
Strecker Gerard R.
The United States of America as represented by the United States
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