Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate
2005-08-30
2005-08-30
Patidar, Jay (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
C324S343000
Reexamination Certificate
active
06937021
ABSTRACT:
The invention relates to a system and methods for locating a fracture in an earth formation. A method for detecting a fracture in an earth formation using an induction tool includes inducing electromagnetic fields using a set of transmitters on the induction tool. A plurality of the transmitters being arranged such that their magnetic moments are transverse or tilted with respect to the tool axis. Voltages induced in a set of receivers on the induction tool are measured, the voltages being induced by eddy currents that result from the electromagnetic fields. A plurality of receivers being arranged such that their axes are transverse or tilted with respect to the tool axis. The transmitters and receivers are spaced apart along the tool axis. The presence of the fracture is determined based on the measured voltages.
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Aurora Reena
Gaudier Dale
McEnaney Kevin P.
Patidar Jay
Schlumberger Technology Corporation
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