Apparatus for focused electrode induced polarization logging
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United States of America Patent
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Apr 15, 1986
Grant Date -
N/A
app pub date -
Jun 20, 1983
filing date -
Jun 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero potential difference between pairs of monitoring electrodes. The measured current and voltage are digitized downhole and transmitted to the surface. At the surface means are provided for determining in-phase and quadrature response.
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