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Title:
HARD ROCK CORING DRILLING TOOL
Document Type and Number:
WIPO Patent Application WO/2020/034349
Kind Code:
A1
Abstract:
A hard rock coring drilling tool, comprising an outer core tube (5) and a hollow drill bit (1), wherein the drill bit (1) is installed at a lower end of the outer core tube (5), outer walls of the outer core tube (5) and the drill bit (1) are each provided with a spiral groove (4), and the spiral groove (4) on the drill bit (1) and the spiral groove (4) on the outer core tube (5) are continuous; the drill bit (1) comprises an inner drill bit (11) and an outer drill bit (12), the inner drill bit (11) is installed in the outer drill bit (12), a lower end of the inner drill bit (11) has a first-stage blade (2), an outer wall of the outer drill bit (12) has a second-stage blade (3), and coolant circuit holes (6) are provided at the first-stage blade (2) and the second-stage blade (3).

Inventors:
XIE HEPING (CN)
ZHANG RU (CN)
ZHANG ZHILONG (CN)
CHEN LING (CN)
GAO MINGZHONG (CN)
LU YIQIANG (CN)
HE ZHIQIANG (CN)
LI CONG (CN)
HUA XIA (CN)
MING CHUANJIAN (CN)
LU TONG (CN)
PENG GAOYOU (CN)
Application Number:
PCT/CN2018/108970
Publication Date:
February 20, 2020
Filing Date:
September 30, 2018
Export Citation:
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Assignee:
UNIV SICHUAN (CN)
UNIV SHENZHEN (CN)
International Classes:
E21B10/02; E21B10/26; E21B25/00
Domestic Patent References:
WO2012115287A12012-08-30
Foreign References:
CN203756038U2014-08-06
CN203756038U2014-08-06
CN106948784A2017-07-14
CN107916895A2018-04-17
CN103097642A2013-05-08
CN203614040U2014-05-28
Attorney, Agent or Firm:
GAOYUNG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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