Title:
WELL DRILLING BIT AND WELL DRILLING METHOD USING SAME
Document Type and Number:
WIPO Patent Application WO/2018/139082
Kind Code:
A1
Abstract:
[Problem] To provide a well drilling bit that can drill in high-temperature hard strata efficiently at a low cost with low replacement frequency and a well drilling method using same. [Solution] A well drilling bit 1 for drilling bedrock comprising a cylindrical bit body 2, and a channel 3 for drilling fluid that is formed in this bit body 2 and by which excavated chips from the bottom of the hole and around the bit body 2 are washed out, wherein the well drilling bit is provided with a venturi pipe VP in which a reduced diameter portion with a reduced cross sectional area is formed in the channel 3 and a venturi mechanism that can generate, by way of the venturi effect, a reduced pressure region around the tip of the bit body 2 that is at a lower pressure than the surroundings.
Inventors:
NAGANAWA SHIGEMI (JP)
TUCHIYA NORIYOSHI (JP)
SHIMADA KUNIAKI (JP)
TUCHIYA NORIYOSHI (JP)
SHIMADA KUNIAKI (JP)
Application Number:
PCT/JP2017/044523
Publication Date:
August 02, 2018
Filing Date:
December 12, 2017
Export Citation:
Assignee:
UNIV TOKYO (JP)
UNIV TOHOKU (JP)
TEISEKI DRILLING CO LTD (JP)
UNIV TOHOKU (JP)
TEISEKI DRILLING CO LTD (JP)
International Classes:
E21B10/60
Foreign References:
| JP2014177810A | 2014-09-25 | |||
| JPS55108592A | 1980-08-20 | |||
| US20090279966A1 | 2009-11-12 | |||
| US4303137A | 1981-12-01 |
Attorney, Agent or Firm:
ABIKO Gen et al. (JP)
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