Concept of large-diameter drilling assembly

The technology of drilling large-diameter multifunction boreholes for rescuing, construction, airing and process operations is discussed. The integrated methods of bottomhole cleaning with simultaneous core disintegration using concurrently compressed air and mudfluid are proposed. Turbulation of compressed air and mud fluid at the bottomhole intensifies the bottomhole washing and increases the rate of penetration. The geometry of large-diameter hole drilling with a pilot hole and with full-diameter drilling is developed. The engineering solution on wall scraping in large-diameter boreholes is presented. The advantage of the successive drilling-out technology for large-diameter boreholes is its realizability using a single drill rig. Given overall harmonization of units, tools and couplings, it is possible to reduce greatly the price of drilling assemblies, which can allow essential saving of drilling cost saving. Core drilling of large-diameter boreholes is complicated by the requirement to remove heavy cores from holes. When core is destructed into large fragments, multiple drilling-out might be required. Arrangement of a large-diameter borehole for life-saving is a separate task which is solved concurrently with drilling. A new indentation tool with a tungsten carbide insert of a special geometry is proposed.

Keywords: concept, drilling tool, large-diameter drilling, vibratory-percussion indenters, nozzle sharpening geometry, pilot hole drilling assembly, shaving, hard rocks.
For citation:

Pelipenko N. A., Ignatenko I. M., Protsuk I. S., Baklanov R. R. Concept of largediameter drilling assembly. MIAB. Mining Inf. Anal. Bull. 2021;(4):16-32. [In Russ]. DOI: 10.25018/0236_1493_2021_4_0_16.

Issue number: 4
Year: 2021
Page number: 16-32
ISBN: 0236-1493
UDK: 622.; 622.86
DOI: 10.25018/0236_1493_2021_4_0_16
Article receipt date: 01.11.2019
Date of review receipt: 16.11.2020
Date of the editorial board′s decision on the article′s publishing: 10.03.2021
About authors:

N.A. Pelipenko1, Dr. Sci. (Eng.), Professor, e-mail:,
I.M. Ignatenko1, Cand. Sci. (Eng.), Director, Institute of Earth Sciences, e-mail:,
I.S. Protsuk, Leading Specialist, IGGIS LLC, e-mail:,
R.R. Baklanov1, Graduate Student, e-mail:,
1 Belgorod State National Research University, 308015, Belgorod, Russia.


For contacts:

N.A. Pelipenko, e-mail:


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