Multi-mode microresistivity tool in boreholes drilled with...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports

Reexamination Certificate

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C324S374000

Reexamination Certificate

active

07046010

ABSTRACT:
A multi-mode resistivity tool measures at multiple depths into the near-borehole formation. By use of a four mode tool, measuring to four depths at the formation, a more accurate invasion zone resistivity measurement may be made than previously known. The tool itself is shown as including six concentric electrodes, although not every electrode is necessary for every mode.

REFERENCES:
patent: 5049822 (1991-09-01), Zoltan et al.
patent: 5570024 (1996-10-01), Vail, III
patent: 6801039 (2004-10-01), Fabris et al.
patent: 2002/0101242 (2002-08-01), Bittar
patent: 2005/0001624 (2005-01-01), Ritter et al.
David P. Shattuck et al; Scale Modelling of the Laterlog Using Synthetic Focusing Methods;The Log Analyst Jul.-Aug. 1987; (pp. 357-369).
SPE 89THAnnual Technical Conference (SEP 28425);Invasion Profiling With a Multiple Depth of Investigation Electromagnetic Wave Resistivity Sensor; M. S. Bittar et al; Sep. 25-28, 1994; (pp. 1-23).

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