US 12,006,770 B2
Method and system for estimating wear of a drill bit
Goran Stenberg, Fagersta (SE); and Erik Rosendal, Orebro (SE)
Assigned to Epiroc Rock Drills Aktiebolag, Örebro (SE)
Appl. No. 17/596,431
Filed by EPIROC ROCK DRILLS AKTIEBOLAG, Orebro (SE)
PCT Filed Jul. 3, 2020, PCT No. PCT/SE2020/050705
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2021/006800, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 1950851-4 (SE), filed on Jul. 5, 2019.
Prior Publication US 2022/0268103 A1, Aug. 25, 2022
Int. Cl. E21B 10/36 (2006.01); E21B 7/02 (2006.01)
CPC E21B 10/36 (2013.01) [E21B 7/025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for estimating wear of a drill bit in percussive rock drilling, wherein a percussion device is configured for generating shock waves in a drill bit for breaking rock,
the method comprising, during drilling:
determining a percussion frequency of the percussion device;
estimating wear of the drill bit based on the determined percussion frequency of the percussion device and a model representation of the wear of the drill bit as a function of percussion frequency, wherein the model representation is configured to output the estimated wear of the drill bit utilising the determined percussion frequency as input signal; and
generating a signal representing a current state of wear of the drill bit.