Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Patent
1982-09-30
1985-06-18
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
G01V 324
Patent
active
045243255
ABSTRACT:
In a dual guard type resistivity logging apparatus, the improvement having the preferred and illustrated form of a short guard electrode pair for making shallow resistivity measurements in a formation is disclosed; a long guard electrode pair is also incorporated for making deep resistivity measurements. The long and short guard pairs are driven by separate oscillators operating at the same frequency or at different frequencies. An electronic switch driven at a low frequency selectively connects the current emitting electrodes to a current return electrode for both long and short guard pair electrodes. The electronic switch empowers one measuring system to operate while the other is inoperative. The switching frequency at is typically of 20-40 Hertz. This enables both measuring systems to provide essentially continuous data in light of the dynamics of the use of such a log, and yet furnishes the two formation current signals wherein the operation of one resistivity measuring system does not interfere with the other resistivity system. A single electrode is used as the return current electrode, and a single voltage reference electrode on the tool is a reference electrode for voltage measurements by both measurement systems.
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Karisch Edward P.
Moore Robert A.
Beard W. J.
Halliburton Company
Strecker Gerard R.
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