US 11,655,681 B2
Inner cutter for drilling
William Brian Atkins, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 17/286,368
Filed by Halliburton Energy Serivces, Inc., Houston, TX (US)
PCT Filed Sep. 16, 2019, PCT No. PCT/US2019/051340
§ 371(c)(1), (2) Date Apr. 16, 2021,
PCT Pub. No. WO2020/117350, PCT Pub. Date Jun. 11, 2020.
Claims priority of provisional application 62/776,021, filed on Dec. 6, 2018.
Prior Publication US 2021/0381317 A1, Dec. 9, 2021
Int. Cl. E21B 10/55 (2006.01); E21B 10/567 (2006.01); E21B 10/43 (2006.01)
CPC E21B 10/5673 (2013.01) [E21B 10/43 (2013.01); E21B 10/55 (2013.01)] 17 Claims
OG exemplary drawing
 
7. A method comprising:
generating, via operation of a drill bit, one or more micro cores as part of a drilling process used to extend a borehole into a foundation material, wherein the drill bit comprises a bit body defining a bit rotational axis, a blade attached to the bit body, and a cutter comprising a cutting arc on a cutting surface of the cutter, wherein the cutter comprises at least one relief comprising a first curved edge deviating from an outer edge of the cutter, a straight edge coupled with the first curved edge, the straight edge configured to generate the one or more micro cores, a second curved edge coupled with the straight edge and having an end that interrupts the cutting arc, the second curved edge configured to fracture the one or more micro cores via side load forces of the drill bit exerted on the one or more micro cores, and a third curved edge curving into the outer edge of the cutter and coupled to the second curved edge.