First field test of the dual core-bit tool for drilling stress record cores at Kamioka mine, Japan

Kazuhiko Tezuka, Toshiya Yamamoto, Takatoshi Ito, Tatsuya Yokoyama, Akio Funato

Research output: Contribution to conferencePaperpeer-review

Abstract

We have developed a tool to drill core samples which is recording in-situ stress information around a bottom of a borehole. When the core is cut from the bedrock, it is released from the in-situ stress and expands slightly in the radial direction. Using this principle, the in-situ stress can be determined from the elliptical shape of the core cross section (Funato & Ito, 2017). However, the difference between major and minor axes of the ellipse only provides the difference between the maximum and the minimum in-situ stress, but the magnitude of each stress component cannot be determined. This is because the core diameter d0 before expansion is unknown. To solve this problem, we proposed the coring procedure using the "Dual core-bit tool" so that the shape before expansion is retained in part of the core. That is, after digging a groove (outer groove) in the borehole bottom by the outer core-bit, cut a smaller diameter core by the inner core-bit in a same way as a normal coring. As a result, the shape before expansion remains in the upper part of the core, and the shape should expand due to stress relief in the lower part deeper than the outer groove. According to this concept, we made a prototype of the dual core-bit tools and conducted the first field test at Kamioka mine in Gifu, Japan. This paper describes the mechanism of the tool and the results of the field test.

Original languageEnglish
Publication statusPublished - 2020
EventSPWLA 25th Formation Evaluation Symposium of Japan, JFES 2019 - Chiba, Japan
Duration: 2019 Sep 252019 Sep 26

Conference

ConferenceSPWLA 25th Formation Evaluation Symposium of Japan, JFES 2019
CountryJapan
CityChiba
Period19/9/2519/9/26

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Economic Geology
  • Geochemistry and Petrology
  • Geology
  • Energy Engineering and Power Technology

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