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Determination of the harmonic distortion value of vibroacoustic signals in the process of drilling operations

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Category: Content №2 2025

Last Updated on 26 April 2025

Published on 30 November -0001

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Authors:

V.S.Morkun, orcid.org/0000-0003-1506-9759, University of Bayreuth, Bayreuth, the Federal Republic of Germany, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

N.V.Morkun, orcid.org/0000-0002-1261-1170, University of Bayreuth, Bayreuth, the Federal Republic of Germany, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.М.Hryshchenko*, orcid.org/0000-0003-4957-0904, State Tax University, Irpin, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

E.Y.Bobrov, orcid.org/0000-0002-9275-3768, Kryvyi Rih National University, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

І.A.Haponenko, orcid.org/0000-0002-0339-4581, Kryvyi Rih National University, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (2): 088 - 095

https://doi.org/10.33271/nvngu/2025-2/088

Abstract:

Purpose. To model and quantitatively evaluate the harmonic distortion of vibroacoustic signals during drilling operations.

Methodology. The following methods are used in the work: analysis of scientific and practical solutions; statistical methods for processing the results of experimental studies; methods of analytical synthesis; computer modelling methods for synthesis and analysis of mathematical models.

Findings. When the drill bit interacts with the rock, it undergoes a non-linear coupled axial-torsional-side vibration and generates an accompanying vibroacoustic signal. Three phases of drilling efficiency can be observed in different types of drill bits. Phase I is typical of the initial stage of drilling due to insufficient load on the bit. In this phase of drilling, the scraping mechanism dominates, low bit load combined with high friction results in wasted energy and low ROP. As WOB increases, the drilling mode moves from Phase I to Phase II, the efficient drilling mode, where there is a linear relationship between WOB and ROP. It is critical to identify the mode of operation that corresponds to Phase III, as a combination of factors will cause the rig to enter this inefficient drilling mode. As an example of the use of non-linear measurements of vibroacoustic signals, a method is considered to quantify the non-linearity of the process of interaction between a drill bit and the rock, which allows the transition of a rig to the inefficient drilling mode to be demonstrated. To solve this problem, the distortion of the harmonic components of the vibroacoustic signal is studied during the evolution of the sticking-sliding effect of the drill bit in its interaction with the rock.

Originality. Method is proposed for detecting the operating modes of a drilling rig during the drilling of a well, in particular for determining the quantitative assessment of the evolution of the bit-stick-slip effect, which differs from the known methods in that the ratio of the power of the harmonic components to the fundamental frequency signal of the accompanying vibroacoustic signal is calculated.

Practical value. This approach makes it possible to demonstrate the transition of the well drilling process to an inefficient mode of operation, preventing a decrease in the penetration rate and an increase in the specific energy consumption.

Keywords: vibroacoustic signal, drilling, nonlinear transformation, evaluating, modelling

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