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 |
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.
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