Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate
2011-01-04
2011-01-04
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Using electrode arrays, circuits, structure, or supports
C324S347000, C324S373000
Reexamination Certificate
active
07863902
ABSTRACT:
A method and system for measuring formation resisitivity is achieved by introducing one or more continuous phase modulated electrical signals into the formation, each signal introduced at a different location. The current of each introduced electrical signal is then sensed, producing an analog voltage signal as a measurement of the formation. Each introduced electrical signal is compared with its respective measured signal of the formation. Each comparison is made in a quadrature demodulation device, producing an in-phase demodulated signal. A quasi-direct-current signal is extracted from each in-phase demodulated signal, producing an analog measurement related to the resistivity of the formation. Each analog measurement is converted into a digital value for further processing. Successive measurements are digitally summed and averaged to increase the signal to noise ratio.
REFERENCES:
patent: 4951263 (1990-08-01), Shope
patent: 5075863 (1991-12-01), Nagamune et al.
patent: 6975121 (2005-12-01), Strack et al.
patent: 7034539 (2006-04-01), Ueda et al.
patent: 7579841 (2009-08-01), San Martin et al.
Arnold Gordon T.
Arnold & Knobloch, L.L.P.
Baker Hughes Incorporated
Knobloch Charles S.
Ledynh Bot L
LandOfFree
Coherent in-phase demodulation for resistivity image tools... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coherent in-phase demodulation for resistivity image tools..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent in-phase demodulation for resistivity image tools... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2670971