Conductive pad around electrodes for investigating the wall...

Details Conductive pad around electrodes for investigating the wall... Conductive pad around electrodes for investigating the wall...

2005-05-10

2005-05-10

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S367000

Reexamination Certificate

active

06891377

ABSTRACT:
The present invention relates to apparatus for a tool for investigating the wall of a borehole in a geological formation, the apparatus comprising: a non-conductive pad having an inside face and an outside face for pressing against the wall; a set of measurement electrodes mounted on the outside face of the pad and means for measuring the potential difference between two measurement electrodes; and both a source electrode adapted to inject current into the geological formation and a return electrode, the set of measurement electrodes being situated between the source electrode and the return electrode for the current; the apparatus being characterized in that the pad comprises an electrically conductive portion covering the entire measurement electrode zone and electrically insulated from the measurement electrodes.

REFERENCES:
patent: 3462678 (1969-08-01), Eaton
patent: 4236113 (1980-11-01), Wiley
patent: 4677385 (1987-06-01), Chapman et al.
patent: 4692707 (1987-09-01), Locke et al.

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