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Study of the wear mechanisms for drill bits used in core drilling
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribologi)
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The thesis work was made in cooperation with the I-EDDA project who evaluates the drill equipment used in core drilling. The aim of this work was to determine how and why the drill bits are worn. The work consisted of two parts; investigate drill bits used in field tests

and develop a lab scale method to be able to change one drill parameter at a time and see how it affects the wear. During the field tests the rotational speed and the pressure on the drill bits were changed between the three boreholes drilled. In the lab test one parameter at a time was changed; the rotational speed, the water flow and the load. The lab test was developed to attempt to replicate the core drilling and was performed by pressing a piece of a drill bit against a rotating stone cylinder. The drill bits from the field tests and lab test were analysed with the same methods on both macro- and microscale for easier comparison. The results indicate that the lab scale test can be used to evaluate the wear of drill bits. The analyses show rock present on the matrix of all the drill bits, in various amounts. The load has the largest impact on the wear of the drill bits and cause a change in mechanism. A high pressure leads to a higher amount of damaged diamonds and three body abrasive wear on the matrix. Lower pressure leads to polished diamonds and erosive wear on the matrix.

Place, publisher, year, edition, pages
2018. , p. 69
Series
UPTEC K, ISSN 1650-8297 ; 18022
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-355399OAI: oai:DiVA.org:uu-355399DiVA, id: diva2:1228806
External cooperation
I-EDDA
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2018-06-29 Created: 2018-06-28 Last updated: 2018-06-29Bibliographically approved

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CiteExportLink to record
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