Impact of unstable drilling on energy efficiency of drill rotor drive

The article describes new research findings on operation of asynchronous motor drive of drill rotor in the modes of unstable drilling accompanied with the stick–slip effect and intrinsic undesirable consequences. Earlier, the authors constructed models of adjustable dcand ac-drives of drill rotor. The studies revealed the necessity to update the mechanical simulation model of the drill bit drag torque and to change from the stochastic model to an integrated model which includes more details of physics of drilling and the impact of drilling mode parameters on the bit drag torque. A new modification is developed for the general computer model of asynchronous motor drive of drill rotor. The modeling and experimental data comparison proves the modeling equivalence of processes caused by free vibrations and torsional vibrations in the model of unstable bit rotation. Specific attention is paid to the impact of unstable drill rotation on energy efficiency of drill rotor drive, and the output parameters of the general model are added with the energy data in this respect. The computer modeling of drilling modes revealed the impact of the process variables on the energy data.

Keywords: rotary drilling, stick–slip effect, asynchronous drive, energy efficiency, computer modeling.
For citation:

Ershov M. S., Feoktistov E. A. Impact of unstable drilling on energy efficiency of drill rotor drive. MIAB. Mining Inf. Anal. Bull. 2022;(1):148-161. [In Russ]. DOI: 10.25018/0236_1493_2022_1_0_148.

Issue number: 1
Year: 2022
Page number: 148-161
ISBN: 0236-1493
UDK: 622.817:621.311
DOI: 10.25018/0236_1493_2022_1_0_148
Article receipt date: 04.09.2021
Date of review receipt: 06.10.2021
Date of the editorial board′s decision on the article′s publishing: 10.12.2021
About authors:

M.S. Ershov, Dr. Sci. (Eng.), Professor, e-mail:, Gubkin Russian State University of Oil and Gaz (National Research University), 119991, Moscow, Russia, ORCID 0000-0002-7772-0095,
E.A. Feoktistov, Student, e-mail: Moscow Institute of Physics and Technology (National Research University), 141700, Moscow, Russia, ORCID 0000-0002-9490-3854.


For contacts:

M.S. Ershov, e-mail:


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