US 11,808,143 B2
Methods and apparatus to measure formation features
Jean-Christophe Auchere, Gif-sur-Yvette (FR); Hiroshi Hori, Châtillon (FR); Adam Pedrycz, Edmonton (CA); and Bharat Narasimhan, Katy, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Apr. 27, 2022, as Appl. No. 17/660,845.
Application 17/660,845 is a continuation of application No. 16/412,140, filed on May 14, 2019, granted, now 11,346,213.
Claims priority of provisional application 62/670,896, filed on May 14, 2018.
Claims priority of provisional application 62/670,887, filed on May 14, 2018.
Prior Publication US 2022/0251946 A1, Aug. 11, 2022
Int. Cl. E21B 47/12 (2012.01); E21B 44/02 (2006.01); E21B 49/00 (2006.01)
CPC E21B 47/12 (2013.01) [E21B 44/02 (2013.01); E21B 49/00 (2013.01)] 20 Claims
OG exemplary drawing
 
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.