US 12,215,549 B2
Drill bit
Jorge Arthur Silveus, III, Fort Worth, TX (US); Alfred Harold Skinner, Aledo, TX (US); and Benjamin Chrest, Fort Worth, TX (US)
Assigned to Ulterra Drilling Technologies, L.P., Fort Worth, TX (US)
Filed by Ulterra Drilling Technologies, L.P., Fort Worth, TX (US)
Filed on Oct. 25, 2022, as Appl. No. 18/049,472.
Application 18/049,472 is a continuation of application No. 16/676,913, filed on Nov. 7, 2019, granted, now 11,480,016.
Application 16/676,913 is a continuation in part of application No. 16/188,227, filed on Nov. 12, 2018, granted, now 11,008,814, issued on May 18, 2021.
Prior Publication US 2023/0175322 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 10/43 (2006.01); E21B 10/55 (2006.01)
CPC E21B 10/43 (2013.01) [E21B 10/55 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A drill bit, comprising:
a body having a face and a central bit axis; and
a plurality of blades disposed on the face of the body, each of the plurality of blades having a row of cutters disposed thereon, the rows of cutters collectively defining a cutting profile of the drill bit, wherein:
wherein a nose region and a cone region of the face, at least six radially adjacent cutters of the cutters along the cutting profile having alternating positive back rake angles;
at least some adjacent cutters of the cutters along the cutting profile have non-alternating back rake angles; and
the difference between a majority of back rake angles on adjacent cutters along the cutting profile is less than 20°.