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Journal of Mining Sciences

2016 year, number 6

Enhancement of Long Hole Drilling Efficiency with Drilling Units with Replaceable Core Receivers

A. L. NEVEROV1, A. V. MINAKOV1,2, V. A. ZHIGAREV1, D. D. KARATAEV3
1Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041 Russia
2Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 1, Novosibirsk, 630090 Russia
3Norilskgeologiya, P.O. Box 889, Norilsk, 663330 Russia
Keywords: математическая модель, неньютоновская жидкость, гидравлические потери давления, нестандартный алмазный породоразрушающий инструмент, mathematical model, non-Newtonian fluid, hydraulic pressure loss, nonstandard diamond drill bit

Abstract

The article presents a procedure to calculate hydraulic pressure losses in hole drilling with units equipped with replaceable core receivers and using non-Newtonian mud fluids. It is found that main hydraulic loss takes place when mud fluid flows in clearing between a drill string and drill hole walls. Numerical modeling has shown that it is possible to reduce hydraulic pressure loss by 76.5-89.0% by increasing drill string diameter by 2 mm. Based on the analytical research results, diamond drill bits and underreamers with the outer diameters of 78.0 and 78.4 mm, respectively, are manufactured for drilling operations in Talnakh ore field.