US 12,071,815 B2
Whipstock for use with a 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. 17/860,377.
Claims priority of provisional application 63/220,839, filed on Jul. 12, 2021.
Prior Publication US 2023/0015654 A1, Jan. 19, 2023
Int. Cl. E21B 29/06 (2006.01); E21B 7/06 (2006.01); E21B 10/43 (2006.01); E21B 10/567 (2006.01); E21B 10/26 (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)] 20 Claims
OG exemplary drawing
 
1. A whipstock, comprising:
a coupling section having a first radius of curvature, the coupling section configured to engage with a mill bit when running in hole;
a casing breakthrough section having a second radius of curvature; and
a controlled exit section having a third radius of curvature, wherein the second radius of curvature is less than the third radius of curvature, wherein the second radius of curvature is at least 5% less than the third radius of curvature.