Title:
FLOW GUIDE DRILL PIPE
Document Type and Number:
WIPO Patent Application WO/2020/151206
Kind Code:
A1
Abstract:
A flow guide drill pipe, comprising a pipe body (1), the pipe body (1) having disposed therein an air inlet channel (2) and a pressure relief channel (3) along an extension direction of the pipe body (1), the pressure relief channel (3) having disposed therein a pressure relief valve (4), and the pipe body (1) having thereon a pressure relief hole (5) matching the pressure relief valve (4). Providing a pressure relief channel (3) and providing a pressure relief valve (4) in the pressure relief channel (3) actively and immediately reduce gas concentration at a bottom of a hole in a hole-drilling process when pressure in the drilling hole exceeds a pressure threshold, stopping excessive gas discharge, and preventing accidents such as hole blowouts and drill jamming; this can also gradually decrease gas concentration in a drilling hole, preventing sudden movement of large amounts of gas, effectively ensuring safe construction of a coal seam drilling hole.
Inventors:
ZHU CHUANQI (CN)
YUAN ANYING (CN)
YUAN ANYING (CN)
Application Number:
PCT/CN2019/096401
Publication Date:
July 30, 2020
Filing Date:
July 17, 2019
Export Citation:
Assignee:
UNIV ANHUI SCI & TECHNOLOGY (CN)
International Classes:
E21B17/18; E21F7/00
Foreign References:
| CN109653689A | 2019-04-19 | |||
| CN109611072A | 2019-04-12 | |||
| CN202017459U | 2011-10-26 | |||
| CN108442890A | 2018-08-24 | |||
| CN103556940A | 2014-02-05 | |||
| CN108505955A | 2018-09-07 | |||
| US20140000905A1 | 2014-01-02 |
Attorney, Agent or Firm:
HEFEI XINGDONG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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