Title:
DRILL BIT FOR CORE SAMPLING, HOLE ADJUSTMENT MEMBER AND DRILLING METHOD
Document Type and Number:
Japanese Patent JP2017008502
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To sample a core by drilling grounds with a different geology with one kind of drill bit for core sampling.SOLUTION: A drill bit for core sampling comprises a cylindrical base metal, an abrasive grain layer formed at the tip part of the base metal for drilling the ground, a plurality of fluid holes 13 that has an opening on the tip surface of the abrasive grain layer, a fluid channel on the tip surface side that is formed on the tip surface and that leads from the opening to an outer peripheral surface of the base metal, and a hole adjustment member 20 attached to the fluid hole 13 for adjusting the number of the fluid hole 13. The number of the fluid hole 13 is adjusted by the hole adjustment member 20 according to the geology of the ground to be drilled.SELECTED DRAWING: Figure 10
Inventors:
SO HAYATO
WADA ATSUSHI
SAWADA MINORU
WADA ATSUSHI
SAWADA MINORU
Application Number:
JP2015122329A
Publication Date:
January 12, 2017
Filing Date:
June 17, 2015
Export Citation:
Assignee:
ASAHI DIAMOND IND
International Classes:
E21B25/00; E02D1/04; G01N1/08
Domestic Patent References:
| JP2015108246A | 2015-06-11 | |||
| JPH07301081A | 1995-11-14 | |||
| JP2007231630A | 2007-09-13 | |||
| JP2002349176A | 2002-12-04 | |||
| JP2002096860A | 2002-04-02 | |||
| JP2000240281A | 2000-09-05 |
Foreign References:
| US20030173116A1 | 2003-09-18 |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Osaka Koichi
Yoshiki Kuroki
Osaka Koichi