THERMAL SCIENCE

International Scientific Journal

A STICK-SLIP VIBRATION IDENTIFICATION METHOD BASED ON WAVELET DECOMPOSITION BY

ABSTRACT
Stick-slip vibrations in drilling reduce efficiency and increase tool failure risks. Current identification methods, relying on surface data or lab models, poor real-time adaptability. This study proposes a novel method combining wavelet decomposition (Morlet wavelet) with multi-parameter logical discrimination to detect vibrations. Four drilling efficiency indicators -bit aggressiveness, cutting depth, torque variation index (TVI), and weight on bit (WOB) variation index-are analyzed from surface data. Wavelet decomposition extracts high-frequency components to quantify vibration intensity, with adaptive decomposition levels (1-3) balancing sensitivity and computational efficiency. Field-calibrated thresholds classify minor and severe vibrations. Validation using downhole acceleration data shows torque signals detect minor vibrations effectively (87-94% accuracy), while bit aggressiveness excels in severe stages. The method reduces reliance on downhole instruments, improves timeliness, and enhances recognition stability by 30-45% over conventional approaches, offering a cost-effective solution for real-time monitoring and risk mitigation.
KEYWORDS
PAPER SUBMITTED: 2025-06-06
PAPER REVISED: 2025-09-07
PAPER ACCEPTED: 2025-09-17
PUBLISHED ONLINE: 2026-07-18
DOI REFERENCE: https://doi.org/10.2298/TSCI250606108Z
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© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International licence