Concentric buttons of different sizes for imaging and...

Details Concentric buttons of different sizes for imaging and... Concentric buttons of different sizes for imaging and...

2011-04-19

2011-04-19

Whittington, Kenneth J (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S357000, C324S363000

Reexamination Certificate

active

07928733

ABSTRACT:
A method of estimating standoff in a borehole through an earth formation, includes: disposing a sensor including a plurality of return electrodes and at least one transmitter electrode disposed in a concentric arrangement into the borehole; injecting current, I, into the formation by applying at least two frequencies of alternating current (AC) voltage between at least two of the electrodes; measuring impedance, Z, for each of the frequencies; and using a predetermined relationship between impedance, Z, and standoff, estimating the standoff. A system and a computer program product are provided.

REFERENCES:
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patent: 6600321 (2003-07-01), Evans
patent: 6714014 (2004-03-01), Evans et al.
patent: 7046010 (2006-05-01), Hu et al.
patent: 7250768 (2007-07-01), Ritter et al.
patent: 7256582 (2007-08-01), Gorek et al.
Randy Gold, et al. “Multi-Resolution Borehole Resistivity Imagining”. U.S. Appl. No. 12/178,306, filed Jul. 23, 2008.
Bittar, et al. “A Muliple-Depth-of-Investigation Electromagnetic Wave Resistivity Sensor: Theory, Experiment, and Field Test Results”. SPE 22705. Sep. 1993. pp. 171-176.

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