IDENTIFYING BIT WEAR AND JUSTIFYING BIT TRIP

Abstract: a method performed while drilling a wellbore in a subsurface formation with a drill bit. the method comprises obtaining sonic logs of the subsurface formation proximate the drill bit. the method comprises determining mechanical specific energy based on drilling parameters. the method comprises comparing respective trends of the sonic logs and the mechanical specific energy of the drill bit to identify a cause for a change in drilling performance of the drill bit. the method comprises performing a drilling operation based on the cause for the change in the drilling performance.

Inventor(s): Yonggui Guo, Shilin Chen, Dale E. Jamison

CPC Classification: E21B44/00 (Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions)

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