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THERMAL SCIENCE
International Scientific Journal
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THE DYNAMICS ANALYSIS OF BOTTOM HOLE ASSEMBLY IN THE DEEPWATER DEEP LONG HORIZONTAL WELL
ABSTRACT
At present, complex well configurations such as sidetracks, multilateral wells, ultra-deep wells, and extended-reach wells are widely applied, resulting in increasingly complex loading conditions for downhole drilling tools. In this study, the dynamic equilibrium equations of the drill string system are established based on Hamilton's principle. Considering initial imperfections of the drill string, a fatigue life prediction model for the drill string system is proposed. Taking a deepwater deep long horizontal well as a case study, the von Mises stress and fatigue life of the bottom hole assembly (BHA) are calculated. By analyzing the influence of different BHA configurations on the fatigue life of the BHA, an optimal BHA scheme is proposed for the given well.
KEYWORDS
drill string dynamics, BHA, mechanical characteristics analysis, parameter optimization, fatigue life
PAPER SUBMITTED: 2025-06-14
PAPER REVISED: 2025-09-20
PAPER ACCEPTED: 2025-10-30
PUBLISHED ONLINE: 2026-07-25
DOI REFERENCE: https://doi.org/10.2298/TSCI250614120Q
[1] Han, C.J., et al., An Analysis of the Drill String Vibration During Gas Drilling of Horizontal Wells, Natural Gas Industry, 29(2009), 7, pp.45-47+136
[2] Kapitaniak, M., et al., Experimental Studies of Forward and Backward Whirls of Drill-String, Mechanical Systems and Signal Processing, 100(2018), 1, pp.454-465
[3] Vijayan, K., et al., Drillstring-borehole Interaction: Backward Whirl Instabilities and Axial Loading, Meccanica Journal of the Italian Association of Theoretical & Applied Mechanics, 52(2017), 11-12, pp.2945-2957
[4] Di, Q. F., et al., Simulation and Analysis of Dynamic Characteristics of Drilling String in Extra-Deep Wells, Petroleum Drilling Techniques, 52(2024), 2, pp.108-117
[5] Zhong, W. J., et al., The Dynamics Characteristics and Strength Check of Drilling String in Ultra-deep Horizontal Well, Journal of SouthwestPetroleum University, 42(2020), 2, pp.135-143
[6] Dushaishi, M. F. A., et al., Vibration Analysis of Simultaneous Drilling and Reaming BHA, Journal of Petroleum Exploration and Production Technology, 10(2020), 8, pp.3409-3417
[7] Mao, L. J., et al., Study on Fatigue Life of BHA based on Drill String Dynamics, China Petroleum Machinery, 50(2022), 9, pp. 1-9
[8] Ling, A. J., et al., Mechanical Analysis of Deepwater Drilling Riser under Different Operating Modes, Thermal Science, 28(2024), 4B, pp.3517-3522
[9] Liu, W., et al., Intelligent Identification Method for Stick-Slip Vibration based on Downhole Data, Thermal Science, 29(2025), 2B, pp.1521-1526
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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