Dual standoff resistivity imaging instrument, methods and computer program products
AssigneeBaker Hughes Incorporated
InventorsGregory B. Itskovich, Stanislav Wilhelm Forgang, Alexandre N. Bespalov
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Abstract
A resistivity imaging apparatus includes: a first sensor electrode disposed on an electrode pad and positioned at a first standoff; a second sensor electrode disposed on the electrode pad and adjacent the first sensor electrode, the second sensor electrode positioned at a second standoff; and a return electrode disposed on the electrode pad, wherein the sensor electrodes and the return electrode are configured for injecting current into a formation and receiving a signal from the formation. Other embodiments, methods and computer program products are disclosed.
Claims19
A resistivity imaging method, comprising:
- performing a first impedance measurement of a formation at a first standoff using at least one sensor electrode disposed in a first plane;
- performing a second impedance measurement of the formation at a second standoff different from the first standoff using the at least one sensor electrode disposed in a second plane offset from the first plane;
- and
- calculating electrical properties of the formation from the first and second impedance measurements.
A resistivity imaging apparatus, comprising:
- at least one sensor electrode configured to perform a first impedance measurement of a formation at a first standoff and to perform a second impedance measurement of the formation at a second standoff different from the first standoff, wherein the first standoff results from the at least one sensor electrode being disposed in a first plane and the second standoff results from the at least one sensor electrode being disposed in a second plane offset from the first plane and the at least one sensor electrode comprises an output for providing measurement information for calculating electrical properties of the formation from the first and second impedance measurements.
A resistivity imaging apparatus, comprising:
- at least one sensor electrode configured to perform a first impedance measurement of a formation at a first standoff and to perform a second impedance measurement of the formation at a second standoff different from the first standoff, and a return electrode, wherein the first standoff results from the at least one sensor electrode being disposed in a first plane and the second standoff results from the at least one sensor electrode being disposed in a second plane offset from the first plane and the at least one sensor electrode and the return electrode are configured for injecting current into a formation and receiving a signal from the formation;
- wherein the at least one sensor electrode comprises an output for providing measurement information for calculating electrical properties of the formation from the first and second impedance measurements.
Dependencies are inferred from the claim text.