Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2005-02-01
2005-02-01
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C175S050000
Reexamination Certificate
active
06850068
ABSTRACT:
A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses an electrode for injecting current into the earth formation and an electrode for obtaining a responsive signal from the borehole. The electrodes are located on the drill bit arm or blade. Measured resistivity values are obtained at the location of the drill bit. Measurements can be taken in both oil-based mud and water-based mud environments. Maximum or minimum resistivity can be used to best represent the resistivity of the surrounding formation.
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Chemali Roland E.
Evans Martin Townley
Hewitt Stanley T.
Makohl Friedhelm
Pastusek Paul
Baker Hughes Incorporated
LeDynh Bot
Madan Mossman & Sriram P.C.
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