Theoretical and experimental research into process of packing in drilling

Authors: Тошниезов Л. Г., Тошов Ж. Б.

The theoretical and experimental research into the process of packing in drilling is reviewed. The causes of packing on the surface of rock-breaking drill tool and the ways of its prevention are identified. The packing process was analyzed from the viewpoints of drilling fluid dynamics and drilling bit cutting structure dynamics, and in both cases, the problem was considered with two purposes: elimination of packers and prevention of packing. Most rolling cutter bits manufactured by various firms in the world have two basic circuits of flushing—central and side waterways (jet flushing). This article, as against the other publications on this subject, describes advantages and disadvantages of the two standard variants, as well as their combination for bottomhole cleaning. For packing prevention, scientists suggest adding of agents in drilling fluids, but the majority of the suggestions are based on tests of special cases. Furthermore, the research shows that the calculated kinetic criteria of efficiency only indirectly influence systems of bottomhole cleaning from chips and on durability of support bearings of roller cutters. The authors have examined the washout dynamics and the drilling bit cutting structure dynamics and think the correctly selected design of hydrodynamic units and structure of the bit can reduce or even prevent packing.

Keywords: Packing, drill bit, drilling process, drilling fluid, hydrodynamics of units, drilling bit cutting structure dynamics, cleansing agents, support, mud.
For citation:

Toshniyozov L. G., Toshov J. B. Theoretical and experimental research into process of packing in drilling. MIAB. Mining Inf. Anal. Bull. 2019;(11):139-151. [In Russ]. DOI: 10.25018/02361493-2019-11-0-139-151.

Issue number: 11
Year: 2019
Page number: 139-151
ISBN: 0236-1493
UDK: 622.235
DOI: 10.25018/0236-1493-2019-11-0-139-151
Article receipt date: 20.05.2019
Date of review receipt: 23.07.2019
Date of the editorial board′s decision on the article′s publishing: 10.10.2019
About authors:

J.B. Toshov1, Dr. Sci. (Eng.), Assistant Professor, e-mail:,
L.G. Toshniyozov1, PhD candidate, e-mail,
1 Tashkent State Technical University, 100095, Tashkent, Uzbekistan.

For contacts:

L. G. Toshniyozov, e-mail:


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