Apparatus for focused electrode induced polarization logging

Details Apparatus for focused electrode induced polarization logging Apparatus for focused electrode induced polarization logging

1983-06-20

1986-04-15

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

045830460

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.

REFERENCES:
patent: 2824279 (1958-02-01), Ferre et al.
patent: 2884590 (1959-04-01), Welz
patent: 2988690 (1961-06-01), Love et al.
patent: 3054046 (1962-09-01), Holmes et al.
patent: 3772589 (1973-11-01), Scholberg
patent: 4335353 (1982-06-01), Lacour-Gayet
patent: 4359687 (1982-11-01), Vinegar et al.
Snyder et al; Complex Formation Resistivity-The Forgotten Half of the Resistivity Log, SPWLA 18th Annual Logging Symposium, Jun. 5-8, 1977, pp. 1-39.

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