Method for measuring earth formation resistivity through an...

Details Method for measuring earth formation resistivity through an... Method for measuring earth formation resistivity through an...

2006-04-25

2006-04-25

Ledynh, Bot (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S370000

Reexamination Certificate

active

07034538

ABSTRACT:
An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore. The apparatus includes a sonde adapted to be moved through the wellbore, and a plurality of voltage measurement electrodes are disposed on the sonde at spaced apart locations. At least one current source electrode is disposed on the sonde. All the electrodes are adapted to make electrical contact with the pipe. The apparatus includes a digital voltage measuring circuit controllably coupled to selected ones of the voltage measurement electrodes and digitally controlled current sources.

REFERENCES:
patent: 5543715 (1996-08-01), Singer et al.
patent: 5680049 (1997-10-01), Gissler et al.
patent: 6246240 (2001-06-01), Vail, III
patent: 6603314 (2003-08-01), Kostelnicek et al.

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