US 11,939,819 B2
Mill bit including varying material removal rates
Wesley P. Dietz, Carrollton, TX (US); David Joe Steele, Carrollton, TX (US); and Christopher Grace, Carrollton, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Jul. 8, 2022, as Appl. No. 17/860,250.
Claims priority of provisional application 63/220,839, filed on Jul. 12, 2021.
Prior Publication US 2023/0008467 A1, Jan. 12, 2023
Int. Cl. E21B 10/43 (2006.01); E21B 7/06 (2006.01); E21B 10/26 (2006.01); E21B 10/567 (2006.01); E21B 29/06 (2006.01); E21B 41/00 (2006.01)
CPC E21B 10/43 (2013.01) [E21B 7/061 (2013.01); E21B 10/567 (2013.01); E21B 29/06 (2013.01); E21B 10/26 (2013.01); E21B 41/0035 (2013.01)] 46 Claims
OG exemplary drawing
 
1. A mill bit, comprising:
a tubular having an uphole end and a downhole end;
a first cutting section having one or more first cutting surfaces disposed about the tubular, the first cutting section having a first material removal rate and configured to engage with wellbore casing disposed within a wellbore; and
a second cutting section having one or more second cutting surfaces disposed about the tubular, the second cutting section having a second material removal rate less than the first material removal rate and configured to engage with a whipstock disposed within the wellbore at a similar time as the first cutting section is engaged with the wellbore casing.