Determining the influence of the condition of rock-destroying tools on the rock cutting force

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.195355

Keywords:

destruction of rock when drilling, well drilling, PDC bits, cutting force

Abstract

At present, the most common tools for drilling operations are those rock-destroying ones that are equipped with cutting elements made from polycrystalline diamonds (PDC) and diamond carbide inserts (DCI). Given this, it is a relevant task to study the influence of the degree of wear of cutting elements on the strength and energy parameters of the process of rock destruction. In order to determine this influence, we have experimentally investigated the cutting process involving a single cutter under laboratory conditions. The mean values of the cutting force components (circular ((Рz) and normal (Рy)) have been established at the cutting depth 0.5; 1.0; 1.5; and 2.0 mm, at a varying degree of the cutting element wear (a flat of 0; 5.0; and 8.0 mm). We have determined the magnitude of cutting work and the specific energy of rock destruction. At a cutting depth of 0.5 mm, with an increase in the cutting element wear rate from 0 to 8 mm, the magnitude of work grows from 0.06376 to 0.121 N∙m. At a cutting depth of 2.0 mm, the magnitude of work increases from 0.624 to 3.603 N∙m. The energy intensity of the rock destruction process increases, with an increase in the cutting depth from 0.5 to 2.0 mm, from 3.88 kJ/m2 to 11.66 kJ/m2 for a sharp cutter. Based on the study results, we have built dependence charts of the average values of the cutting force components and its normal component (Рy) on cutting depth and the cutting element wear degree. The results obtained have shown a significant influence of the size of the wear flat on the increase in the process strength parameters, which is the basis for regulating a wear degree of cutting elements during drilling. We have established the tendency towards a growth in the resultant force and specific work of rock cutting by a cutting element with an increase in wear degree. This makes it possible to determine, based on the indicators of fluctuations in the instantaneous strength values during drilling of wells, or based on a change in power, the wear degree of the cutting elements, and to predict the probability of their destruction

Author Biographies

Vasil Ivasiv, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Doctor of Technical Sciences, Professor

Department of Oil and Gas Equipment and Machinery

Andriy Yurych, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, Associate Professor

Department of Drilling

Sergii Zabolotnyi, V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine Autozavodska str., 2, Kyiv, Ukraine, 04074

Deputy Head of Department

Computer modeling and mechanics of composite materials Department

Lidiia Yurych, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Assistant

Department of Well Drilling

Vasyl Bui, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

Department of Engineering and Computer Graphics

Orest Ivasiv, Research and production center of technical diagnostics "Techdiagas" branch "Ukrtransgaz" Volynska str., 56, Kyiv, Ukraine, 03151

Senior Engineer

Technical diagnostics Sector

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Published

2020-02-29

How to Cite

Ivasiv, V., Yurych, A., Zabolotnyi, S., Yurych, L., Bui, V., & Ivasiv, O. (2020). Determining the influence of the condition of rock-destroying tools on the rock cutting force. Eastern-European Journal of Enterprise Technologies, 1(1 (103), 15–20. https://doi.org/10.15587/1729-4061.2020.195355

Issue

Vol. 1 No. 1 (103) (2020): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2020 Vasil Ivasiv, Andriy Yurych, Sergii Zabolotnyi, Lidiia Yurych, Vasyl Bui, Orest Ivasiv

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