Back to results
US 7,679,368 B2Granted
Reflection coefficient measurement for water-based mud resistivity imaging
AssigneeBaker Hughes Incorporated
InventorMartin Folberth
Life of this patent
Estimating the term…
Abstract
A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The impedance seen by the measurement electrode (indicative of the formation resistivity) is determined by using a directional coupler that measures a reflection coefficient of an electrical signal.
Claims13
An apparatus for evaluating an earth formation, the apparatus comprising:
- a logging tool configured to be conveyed in a borehole;
- at least one measure electrode on the logging tool configured to convey a measure current into the formation;
- and
- a directional coupler configured to enable determination of an impedance associated with the measure electrode.
1 more element
A method of evaluating an earth formation, the method comprising:
- conveying a logging tool into a borehole;
- conveying a measure current into the formation using at least one measure electrode on the logging tool;
- and
- using a directional coupler for determining an impedance associated with the measure electrode.
1 more element
Dependencies are inferred from the claim text.