№84-4

Design and technological aspects of the operation of modern downhole devices for abrasive-mechanical percussion drilling

A. Ihnatov¹, https://orcid.org/0000-0002-7653-125X

I. Askerov¹ https://orcid.org/0000-0002-8398-0205

¹Dnipro University of Technology, Dnipro, Ukraine

Coll.res.pap.nat.min.univ. 2026, 84:46–65

Full text (PDF)

https://doi.org/10.33271/crpnmu/84.046

ABSTRACT

Purpose. Analysis of abrasive-mechanical percussive drilling devices and substantiation of improved rock destruction efficiency through optimization of operating parameters of downhole devices GPB-1T, GPB-1V, GPB-1GU, and GPB-1PU.

Research methodology. System analysis, engineering generalization, and experimental studies in model boreholes were applied. A generalized rock destruction model was developed, accounting for the combined action of pellet impact, abrasive, mechanical, and percussive-rotary effects. The principles for determining the main operating parameters were generalized, including the flow rate of the working medium Q, the velocity of ball movement v_к, their diameter d_к, the number of balls M, the rotational speed of the mechanical element n, the axial load C, as well as the impact frequency f and impact energy E.

Research results. Regularities in the development of designs were established, ranging from pellet impact drill schemes (GPB-1T) to abrasive-rotary (GPB-1V) and percussive-rotary systems (GPB-1GU, GPB-1PU). The rational number of rock-breaking balls was experimentally determined as M = 35–45, at which the maximum rock destruction intensity is achieved. It was shown that increasing the rotational speed to n = 225–370min^-1and the axial load to C = 2–4N/mm²increases the rate of bottom-hole penetration. For the percussive models, a rational operating mode with an impact frequency of f = 5–7Hz was established.

Originality. The principles of combined ball-jet, abrasive, and percussive-rotary rock destruction were further developed, with the influence of the parameters M, n, C, f on the intensity of rock destruction in the bottom-hole zone being established.Their rational values for the studied conditions (M ≈ 40; n ≈ 300 min^-1; C ≈ 3 N/mm²; f ≈ 6 Hz) have been determined, along with approaches to the effective coordination of operating modes of the proposed devices.

Practical implications. The obtained results make it possible to substantiate rational operating modes for the devices GPB-1T, GPB-1V, GPB-1GU, GPB-1PU and to improve the efficiency of well drilling under various mining and geological conditions.

Keywords: drilling,hydraulic hammer, pellet impact drill,percussion-rotary method, rock-breaking balls, downhole device, well, operating parameters.

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date of first submission of the article to the publication – 01/10/2026
date of acceptance of the article for publication after review – 02/13/2026
date of publication – 03/31/2026