US 12,473,815 B2
Reduction of backward whirl during drilling
Shilin Chen, Montgomery, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Appl. No. 17/309,300
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
PCT Filed Dec. 27, 2018, PCT No. PCT/US2018/067657
§ 371(c)(1), (2) Date May 17, 2021,
PCT Pub. No. WO2020/139341, PCT Pub. Date Jul. 2, 2020.
Prior Publication US 2022/0025755 A1, Jan. 27, 2022
Int. Cl. E21B 44/02 (2006.01); E21B 45/00 (2006.01)
CPC E21B 44/02 (2013.01) [E21B 45/00 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a processor; and
a machine-readable medium having program code executable by the processor to cause the apparatus to,
determine a first parameter based on a derivative of a walk force to a rate of lateral penetration of a drill bit while the drill bit is rotating in a bit rotation direction when drilling a borehole,
generate a whirl index value that comprises a ratio of drilling parameters, wherein the drilling parameters include the first parameter and weight on bit,
based on a determination that the whirl index value exceeds a whirl index threshold, determine that a drilling operation induces backward whirl, wherein the drilling operation is characterized by the drilling parameters, and
adjust a drilling parameter of the drill bit during the drilling operation in response to the determination that the whirl index value exceeds the whirl index threshold.