Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2011-05-10
2011-05-10
Aurora, Reena (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C324S347000
Reexamination Certificate
active
07940050
ABSTRACT:
A method for measuring a resistivity parameter of an earth formation is provided. The method includes: conveying a measurement current from at least one measurement electrode into the formation, the at least one measurement electrode having a potential; receiving the measurement current by at least one return electrode; and estimating a resistivity parameter from a measurement value selected from at least one of the measurement current and the potential, the resistivity parameter based on (i) an impedance calculated from the measurement value and (ii) a correction factor calculated from a plurality of measurement values related to a conductivity of a fluid in a borehole and a dielectric constant of the fluid in the borehole. A system for measuring a resistivity parameter of an earth formation is also provided.
REFERENCES:
patent: 7394258 (2008-07-01), Itskovich et al.
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A.G. Brooks, et al. “Calculation of MWD Electromagnetic Resistivity Tool Response by a Finite-Element Method”. SPE 19623. 64th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held in San Antonio, TX, Oct. 8-11, 1989.
Bespalov Alexandre N.
Itskovich Gregory B.
Aurora Reena
Baker Hughes Incorporated
Cantor & Colburn LLP
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