CPC E21B 47/12 (2013.01) [E21B 44/02 (2013.01); E21B 49/00 (2013.01)] | 20 Claims |
1. A method for generating a corrected wellbore log, the method comprising:
receiving first and second logs made with corresponding first and second axially spaced ultrasonic measurement sensors on a logging tool, the first and second logs made while rotating and translating the logging tool in a wellbore such that each of the first and second logs includes a two-dimensional image of a sensor measurement versus a number of tool rotations and wellbore azimuth, the two-dimensional image including a plurality of azimuthal scan lines;
selecting a depth of interest in the first and second logs;
identifying (i) a first feature measured at a first time at the selected depth in the first log, (ii) a second feature measured at a second time at the selected depth in the second log;
and (iii) a third feature measured at a third time at a subsequent depth in one of the first and second logs, wherein the first feature and the second feature are the same feature;
processing a difference between the first feature in the first log and the second feature in the second log to compute a correction factor;
applying the correction factor to the third feature to correct a depth discrepancy of the third feature;
repeating the selecting, the identifying, the processing, and the applying for a plurality of selected other depths and a plurality of other features in the first and second logs to generate the corrected wellbore log;
and performing at least one of a cementing operation, a coiled-tubing operation, a hydraulic fracturing operation, or setting a packer using the corrected wellbore log.
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