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Minerals 2017, 7(7), 121; https://doi.org/10.3390/min7070121

Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling

Division of Mining and Geotechnical Engineering, Luleå University of Technology, 97187 Luleå, Sweden
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Received: 24 May 2017 / Revised: 4 July 2017 / Accepted: 13 July 2017 / Published: 17 July 2017
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Abstract

A detailed understanding of the drilling system and the drilling control is required to correctly interpret rock mass conditions based on monitored drilling data. This paper analyses data from hydraulic in-the-hole (ITH) drills used in LKAB’s Malmberget mine in Sweden. Drill parameters, including penetration rate, percussive pressure, feed pressure, and rotation pressure, are monitored in underground production holes. Calculated parameters, penetration rate variability, rotation pressure variability, and fracturing are included in the analysis to improve the opportunity to predict rock mass conditions. Principal component analysis (PCA) is used to address non-linearity and variable interactions. The results show that the data contain pronounced hole length-dependent trends, both linear and step-wise linear, for most parameters. It is also suggested that monitoring can be an efficient way to optimize target values for drill parameters, as demonstrated for feed force. Finally, principal component analysis can be used to transfer a number of drill parameters into single components with a more straightforward geomechanical meaning. View Full-Text
Keywords: drill monitoring technique; hydraulic in-the-hole (ITH) drilling; measurement while drilling (MWD); rock mass characterization; drill system behavior drill monitoring technique; hydraulic in-the-hole (ITH) drilling; measurement while drilling (MWD); rock mass characterization; drill system behavior
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ghosh, R.; Schunnesson, H.; Gustafson, A. Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling. Minerals 2017, 7, 121.

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