Device and process for determination of the resistivity of a...

Details Device and process for determination of the resistivity of a... Device and process for determination of the resistivity of a...

2007-11-20

2007-11-20

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S347000, C324S348000

Reexamination Certificate

active

10527926

ABSTRACT:
Body (22) for measuring the resistivity of a formation (9) surrounding a well (10) equipped with a lining (11), comprising: a body (23) of a probe (22), a set of three primary voltage measurement electrodes (ea, eb, ec), an upper electrode (ea) and a lower electrode (ec) and a central electrode (eb), two electrodes (In1, In2), an upper current injection electrode (In1) and a lower current injection electrode (In2) arranged on each side of the set of primary electrodes, characterized in that it also comprises, two secondary voltage measurement electrodes (24, 26) arranged on each side of the set of primary electrodes (ea, eb, ec), and between the two current injection electrodes (In1, In2), the spacing between a secondary electrode (24, 26) and the closest primary end electrode (ea, ec) being more than 1.5 times the spacing between the primary electrodes (ea, eb, ec).

REFERENCES:
patent: 4796186 (1989-01-01), Kaufman
patent: 5339037 (1994-08-01), Bonner et al.
patent: 5680049 (1997-10-01), Gissler et al.
patent: 6353322 (2002-03-01), Tabarovsky et al.
Karsani Aulia et al “Resistivity Behind Casing” Oilfield Review, Elsevier, Amsterdam NL, vol. 13, No. 1, Mar. 21, 2001 pp. 2-25.

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