Authors: V.G. Gorelikov, M.Yu. Nasonov, S.I. Protasov, Gantulga. Baatarkhu

Title of the article: Analytical study of the mechanism of well deepening in diamond drilling

Year: 2017, Issue: 5, Pages: 24-29

Branch of knowledge: Earth sciences

Index UDK: 622.24

DOI: 10.26730/1999-4125-2017-5-24-29

Abstract: This paper presents the study of the mechanism of well deepening in diamond drilling. Normal development of the process of well deepening is associated with the conformance of the volume of the broken rock with the volume of the intercontact space of the pair “diamond bit – downhole”, that in its turn depends on the number of diamonds which are in contact with the downhole. The mechanism of the well deepening per 1 revolution of the bit is analysed on the basis of the considered schemes of diamonds’ contact with the downhole. The analysis of well deepening per 1 revolution showed considerable variation of values. So even when drilling in the conditions of a test bench in one and the same rock, with the constant parameters of the drilling regime for one and the same type and diameter of the bit, the well deepening varies per 1 revolution from 0.1 to 0.6 mm. Also, with the accepted schemes of the well deepening, it is necessary to meet the condition according to which the bit is in constant contact with the downhole and on all cutting lines in contact with the rock there is the same number of diamonds. In fact, as shown by a number of studies, this is unlikely. In this connection, it is necessary to conduct additional studies to clarify the mechanism of the drill bit contacting with the downhole and the hypothesis about correlation of the volume of the intercontact space of the pair “diamond bit – downhole” to the volume of broken rock per 1 revolution of drilling in rocks of different hardness.

Key words: Diamond bit downhole drilling calculation methods the number of diamonds deepening per 1 revolution

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