Abstract
The present study was based on the results of the experimental research into the process of diamond core drilling in pulse flushing mode within the frames of projects implemented by the Department of Deposits Prospecting Technique at the National Mining University (Dnipro University of Technology, Dnipro, Ukraine). The authors hereby express their gratitude to all colleagues at the Department of Deposits Prospecting Technique who took part in the experimental research.
Highlights
Borehole drilling is one the most power consuming processes during exploration, survey and mining of mineral resources
To characterize pulse flushing mode, we have introduced the intermittency factor kint which can be determined as a ratio: kint
Based upon the (2) and (4), under the same values of bottom-hole efficiency Npulse = Nconst and equal figures for down-hole surface areas Spulse = Sconst, the increase in the mechanical rate of drilling seems possible to achieve only by reduction of power consumption related to rock decomposition process: ( ) Keff =
Summary
Theoretical analysis, processing of the obtained experimental data. Findings. The decrease in power consumption of rock decomposition process during drilling with jet pulse flushing was studied. The influence of the bottom-hole power and jet pulse flushing parameters on the efficiency of rock decomposition process was investigated. The relative reduction of energy consumption of the rock decomposition process is increasing when the bottom-hole power is decreasing. The study provides theoretical grounds for the increase in the mechanical rate of drilling during the jet pulse flushing owing to utilization of the generated frictional thermal energy in the bottom-hole. It is demonstrated that the pulse flushing mode has a potential to improve the performance of diamond core drilling. The outcomes of the research can be useful for grounding the specifications of the jet pulse flushing method during the development of the energy saving modes of diamond core drilling processes
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