Apparatus and method for estimating eccentricity effects in resistivity measurements
AssigneeBaker Hughes Incorporated
InventorGulamabbas Merchant
Life of this patent
Estimating the term…
Abstract
A method of evaluating an earth formation is disclosed which includes conveying a logging tool into a borehole in the earth formation and using the logging tool to obtain a first set of azimuthally-independent resistivity measurements of the earth formation and a second set of azimuthally-sensitive resistivity measurements of the earth formation and estimating a value of a property of the earth formation using the first set of measurements and the second set of measurements, the estimation being substantially unaffected by a displacement of the logging tool from a center of the borehole.
Claims19
A method of evaluating an earth formation, the method comprising:
- obtaining first azimuthally-independent resistivity measurements of the formation and second azimuthally-sensitive resistivity measurements of the formation using a logging tool;
- and
- estimating a value of a property of the earth formation using the first measurements and the second measurements, the estimation being substantially unaffected by a displacement of the logging tool from a center of the borehole.
An apparatus configured to evaluate an earth formation, the apparatus comprising:
- a logging tool configured to be conveyed into a borehole and obtain first azimuthally-independent resistivity measurements of the formation and second azimuthally-sensitive resistivity measurements of the formation;
- and
- at least one processor configured to estimate a value of a property of the earth formation using the first measurements and the second measurements, the estimate being substantially unaffected by a displacement of the logging tool from a center of the borehole.
A non-transitory computer-readable medium product having instructions thereon that when read by at least one processor cause the at least one processor to execute a method, the method comprising:
- using first azimuthally-independent resistivity measurements from a logging tool conveyed in a borehole and second azimuthally-sensitive measurements made by the logging tool for estimating a value of a property of the earth formation, wherein the estimate is substantially unaffected by a displacement of the logging tool from a center of the borehole.
Dependencies are inferred from the claim text.