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The use of specific energy in rotary drilling: the effect of operational parameters
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0001-9108-9386
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

In rotary drilling, specific energy is considered to be an important parameter for defining mechanical efficiency of the rock destruction process. Specific Energy is defined as the energy required to remove one unit of rock. Specific energy is the function of the size of the borehole and various operational parameters including feed force, rotation speed, rotation torque and penetration rate. The harder the material, the higher the specific energy. The traditional method to calculate the specific energy is based on the parameters penetration rate, feed force, torque and rotation speed, that can be provided by Measurement While Drilling (MWD) data from the drill process. In this study, MWD data from an open pit mine in Sweden are used to evaluate data trends among logged parameters and calculated average specific energy. The results show that there is a significant hole length dependency for penetration rate and feed force that affects the predicted specific energy. This may be explained by that the hole cleaning efficiency is reduced with increasing hole length. The analysis shows that the specific energy is over-estimated by 45% in the bottom of an 18 m hole compared to the collaring point. The suggested solution is to use hole average or complement the specific energy calculation with a hole length related component.Keywords: Specific energy, Measurement While Drilling (MWD), Rotary drilling, Geo-mechanical response, Rock-destruction process

Place, publisher, year, edition, pages
2015.
National Category
Other Civil Engineering
Research subject
Operation and Maintenance; Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-37495Local ID: b8aef0ed-ae1d-442c-8675-2525a351eb98OAI: oai:DiVA.org:ltu-37495DiVA, id: diva2:1010993
Conference
International Symposium on the Application of Computers and Operations Research in the Mineral Industry : 23/05/2015 - 27/05/2015
Note
Godkänd; 2015; 20150107 (rajgho)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-12Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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