Method and system of calculating resistivity of an earth...

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

Reexamination Certificate

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C324S375000, C324S357000

Reexamination Certificate

active

07746078

ABSTRACT:
Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair comprises a first current source and a first current return, the first current return receives current from the first current source; a second CSCR pair, the second CSCR pair disposed along a longitudinal axis of said apparatus from the first CSCR pair, the second CSCR pair comprises a second current source and a second current return, and the second current return receives current from the second current source; and a monitor electrode disposed between the first CSCR pair and the second CSCR pair, a distance between the first current source and the monitor electrode is substantially equal to the distance between the second current source and the monitor electrode, and the monitor electrode monitors a first voltage and a second voltage.

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P. Cheung, et al. SPWLA 42nd Annual Logging Symposium; Field Test Results of a New Oil-Base Mud Formation Imager Tool; Jun. 17-20, 2001 (pp. 1-14) USA.
J. Lofts, et al. SPWLA 43rd Annual Logging Symposium, A New Micro-Resistivity Imaging Device for Use in Oil-Based Mud, Jun. 2-5, 2002 (pp. 1-14; USA.

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