Analytical estimation of inertial properties of the curved rotating section in a drill string

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.154827

Keywords:

drill string, drill pipe, curved rod, concentrated mass, distributed mass, moment of inertia

Abstract

We have proposed approaches to analytical assessment of the moment of inertia related to the curved rotary sections in a drill string. Research into rotation processes of the curvilinear sections in a drill string is associated at present with a particular difficulty, which arose because of the lack of precise expressions to evaluate the moments of inertia for a curved pipe based on the parameters of its deformation. Solution to such problems is important for the analysis of dynamic resistance of drill strings at rotor and rotor-turbine drilling techniques, when studying the stressed-strained state of its elements, refining the energy costs for rotation process of the curved sections in a well, as well as for analysis of critical rotation speeds. We have investigated the moment of inertia for a bent section in the rotating drill string using the models with concentrated and distributed masses. Based on the results, we have established the exact and asymptotic analytical dependences in order to determine inertial characteristics of the curvilinear sections in a drill string, as well as provided recommendations regarding the application of these dependences.

A current trend in the development and modernization of drilling equipment is the use of drill pipes made of unconventional materials. Given the scientific and practical interest in the application of these materials, we calculated the moments of inertia for the curved sections of drill strings, which can be equipped with steel, aluminum, titanium, or glass-plastic drill pipes. Analytical estimation of the moment of inertia of curved sections refers to a different scale of the deformed state of a drill string. The formula for the moment of inertia, established for simple models, holds in cases when the curved section of a drill string executes large displacements. For the case of small displacements, it is necessary to apply the analytical result derived when using a model with distributed parameters. The established patterns are essential for analyzing the dynamics of a drill string in deep conditionally vertical, inclined-directional, or horizontal wells with a complex mining-geological profile

Author Biographies

Jaroslav Grydzhuk, Ivano-Frankivsk National Tachnical Univercity of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Тechnical Mechanics

Igor Chudyk, Ivano-Frankivsk National Tachnical Univercity of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Doctor of Technical Sciences, Professor

Department of Well Drilling

Andriy Velychkovych, Ivano-Frankivsk National Tachnical Univercity of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Building Mechanics

Andriy Andrusyak, Ivano-Frankivsk National Tachnical Univercity of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Building Mechanics

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Published

2019-01-22

How to Cite

Grydzhuk, J., Chudyk, I., Velychkovych, A., & Andrusyak, A. (2019). Analytical estimation of inertial properties of the curved rotating section in a drill string. Eastern-European Journal of Enterprise Technologies, 1(7 (97), 6–14. https://doi.org/10.15587/1729-4061.2019.154827

Issue

Vol. 1 No. 7 (97) (2019): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2019 Jaroslav Grydzhuk, Igor Chudyk, Andriy Velychkovych, Andriy Andrusyak

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