№85-5
Technical means and technologies for eliminating stuck drill pipes in wells
A. Ihnatov1 https://orcid.org/0000-0002-7653-125X
Ye. Stavychnyi2 https://orcid.org/0000-0001-8583-2313
I. Askerov1 https://orcid.org/0000-0002-8398-0205
Yu. Bochkur3 https://orcid.org/0009-0005-9315-2170
S. Rybachuk2 https://orcid.org/0009-0001-8177-204X
1Dnipro University of Technology, Dnipro, Ukraine
2Public Company “Ukrnafta”, Kyiv, Ukraine
3Limited Liability Company “NADRA ENGINEERING”, Ivano-Frankivsk, Ukraine
Coll.res.pap.nat.min.univ. 2026, 85:56–72
Full text (PDF)
https://doi.org/10.33271/crpnmu/85.056
ABSTRACT
Purpose. Enhancing the efficiency of drill string sticking elimination under adverse conditions through the analysis of the causes of downhole complications and substantiation of the application of the PGB–3V vacuum-chamber hydraulic hammer.
The methods. A comprehensive analysis of drilling operational data from Well No. 16 of the Kachanivske field, drilling fluid parameters, drilling modes, and the spatial well profile was carried out. To evaluate the performance efficiency of the PGB–3V hydraulic hammer, analytical relationships were used to determine the impact energy E, impact frequency f, impact power N, and friction forces Ffr.
Findings. It was established that the greatest influence on the occurrence of drill string sticking is exerted by wellbore curvature, insufficient bottomhole cleaning, deterioration of cuttings transport, and an increase in friction forces between the drill string and the wellbore walls. It was determined that, within problematic intervals, excessive drag of the drill string, deterioration of drill tool passage, and complications in drilling fluid circulation were observed. It was found that the use of hydraulic impact mechanisms improves the passage of the bottom hole assembly and reduces the negative effect of friction forces. The prospects of applying the PGB–3V vacuum-chamber hydraulic hammerfor the elimination of downhole complications were demonstrated.
The originality. Approaches to the application of hydraulic impact mechanisms for the elimination of drill string sticking were further developed by establishing the influence of impact parameters, friction forces, and drilling fluid circulation modes on the efficiency of passing problematic well intervals.
Practical implementation. The obtained results make it possible to substantiate rational operating modes for the PGB–3V and to improve the efficiency of eliminating downhole complications. The research results can be used in selecting technological modes for performing remedial and preventive operations under complex well construction conditions.
Keywords: well drilling, drill string sticking, hydraulic hammer,impact, drill string, pressure, drilling fluid, bottom hole assembly, hydraulic drive, rock.
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date of first submission of the article to the publication – 04/10/2026
date of acceptance of the article for publication after review– 05/11/2026
date of publication – 06/30/2026