US 12,241,322 B1
Systems and methods for determining wear of downhole tools
Wei Chen, Houston, TX (US); Gregory Michael Skoff, Houston, TX (US); Huseyin Murat Panayirci, Cambridge (GB); Zhengxin Zhang, Houston, TX (US); Yuelin Shen, Houston, TX (US); and Maria Lucia Cazares Gomez, Denver, CO (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Nov. 9, 2023, as Appl. No. 18/505,231.
Int. Cl. E21B 44/00 (2006.01); E21B 21/12 (2006.01); E21B 45/00 (2006.01)
CPC E21B 21/12 (2013.01) [E21B 45/00 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of detecting wear of a downhole tool implemented in a subject wellbore, comprising: receiving offset wellbore data for one or more offset wellbores;
based on the offset wellbore data, determining an expected formation stiffness at each of a plurality of measurement depths of a formation in which the one or more offset wellbores and the subject wellbore are located;
receiving subject wellbore data for the subject wellbore; based on the subject wellbore data, determining a subject formation stiffness for the downhole tool at each of the plurality of measurement depths;
comparing the subject formation stiffnesses to the expected formation stiffnesses to determine a formation stiffness ratio at each of the plurality of measurement depths, and classifying the formation stiffness ratios based on one or more predetermined thresholds for the formation stiffness ratios;
determining a cumulative wear index of the downhole tool based on associating the classifications of the formation stiffness ratios to a number of revolutions of the downhole tool over the plurality of measurement depths; and
determining that the cumulative wear index exceeds a threshold and in response completing at least one of: removing the downhole tool and replacing the downhole tool.