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US 7,804,302 B2Granted
Method and apparatus for enhancing formation resistivity images obtained with downhole galvanic tools
AssigneeBaker Hughes Incorporated
InventorsStanislav W. Forgang, Randy Gold
Life of this patent
Estimating the term…
Abstract
The average current at a plurality of measure electrodes of a resistivity imaging tool is determined and subtracted from the individual measure currents to give a resistivity image with improved dynamic range.
Claims25
An apparatus used to sense a property of a subterranean region, the apparatus comprising:
- (a) a plurality of sensors, each sensor configured to produce a signal indicative of the property of the subterranean region;
- and
- (b) circuitry configured to provide an output signal for each of the plurality of sensors, each of the output signals comprising a difference between a signal from each of the plurality of sensors and a combined signal derived from the plurality of sensors.
A method of evaluating a subterranean region, the method comprising:
- (a) acquiring a plurality of signals indicative of a property of the subterranean region;
- and
- (b) using downhole circuitry for providing a difference between each of the signals and a combined signal derived from the plurality of signals.
Dependencies are inferred from the claim text.