Formation resistivity measurement apparatus, systems, and methods
AssigneeHalliburton Energy Services, Inc.
InventorsAhmed Fouda, Luis Emilio San Martin, Burkay Donderici
Life of this patent
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Abstract
Apparatus, systems, and methods may operate to correct measured voltage data for selected weak differential measurements to provide corrected voltage data. Additional activity may include adjusting the corrected voltage data to remove level shifts in the measured voltage data caused by downhole tool impedance to provide adjusted voltage data, converting the adjusted voltage data into apparent resistivity data, inverting the apparent resistivity data to determine true resistivity values for a geological formation, and operating a controlled device according to the true resistivity values for the geological formation. Additional apparatus, systems, and methods are disclosed.
Claims21
A method, comprising:
- correcting measured voltage data for selected weak differential measurements to provide corrected voltage data;
- adjusting the corrected voltage data to remove level shifts in the measured voltage data caused by downhole tool impedance to provide adjusted voltage data;
- converting the adjusted voltage data into apparent resistivity data;
- inverting the apparent resistivity data to determine true resistivity values for a geological formation;
- and
- operating a controlled device according to the true resistivity values for the geological formation.
A system, comprising:
- at least one tool to measure voltage in a geological formation as measured voltage data;
- and
- a processing unit coupled to the at least one tool to receive the measured voltage data, the processing unit to operate to correct the measured voltage data for selected weak differential measurements to provide corrected voltage data, to adjust the corrected voltage data to remove level shifts in the measured voltage data caused by the at least one tool impedance to provide adjusted voltage data, to convert the adjusted voltage data into apparent resistivity data, and to invert the apparent resistivity data to determine true resistivity values for the geological formation.
Dependencies are inferred from the claim text.