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Rock fracture density characterization using measurement while drilling(MWD) techniques

International Journal of Mining Science and Technology 2018年第6期28卷 859-864页

作者： mohammad babaei khorzoughi Robert Hall Derek Apel Norman B.Keevil Institute of Mining Engineering University of British Columbia School of Mining and Petroleum Engineering University of Alberta

Accurate determination of rock mass properties is a critical part of open-pit mine planning activities to enable more prescriptive blast designs to achieve improved loading and hauling and downstream process efficiency. Better and more accurate blast practice that delivers enhanced outcomes(better fragmentation, improved diggability, less dilution, etc.) is a critical and fundamental element of being able to achieve an effective Mine-Mill approach at a mining operation. Based on previous work, it has been demonstrated that an accurate representation of the rock mass properties can be obtained from the analysis of variations in blasthole drill performance as derived from measurement while drilling(MWD) systems when using tricone bits. This paper further investigates how monitored rate of penetration,pulldown force, rotary torque, rotary speed and bailing air pressure responses can be used to determine the presence of open and partially open fractures having varying dip angles. Based on a correlation of geophysically measured fracture logs and monitored drill performance variables in the same blastholes, the results show that the latter responses can accurately determine open versus closed fractures. The results also identified that variations in rate of penetration and rotary torque show the most sensitivity in the presence of open fractures that intersect a vertical blasthole at near orthogonal angles.

关键词： Measurement while drilling Fractures Rotary blasthole drill Drill performance variables Fracture frequency Logging

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Processing of measurement while drilling data for rock mass characterization

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International Journal of Mining Science and Technology 2016年第6期26卷 989-994页

作者： babaei khorzoughi mohammad Hall Robert Norman B.Keevil Institute of Mining Engineering University of British Columbia School of Mining and Petroleum Engineering University of Alberta

The information extracted from monitoring of rotary blasthole drills helps to optimize the overall mining operation. Rock hardness, drillability, blastability and specific energy of drilling are examples of parameters that have been estimated in the past using measurement while drilling techniques. In order to be able to properly utilize measurement while drilling techniques, it is important to properly collect, analyze and interpret extracted data. This paper deals with processing of measurement while drilling data such as rate of penetration, rotary speed, rotary torque and pulldown force collected from rotary blasthole *** methods are discussed to calculate a true rate of penetration which is the most important monitored drill variable for use in rock mass characterization. Then specific energy of drilling is defined and calculated based on electrical and mechanical inputs and the results are compared. The results show that specific energy of drilling can be estimated using the drill's primary drive systems' electrical responses with good accuracy when compared to values based on mechanical inputs.

关键词： Measurement while drilling Rotary blasthole drill Specific energy Rate of penetration

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维普期刊数据库

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