Title:
METHOD FOR EFFICIENTLY PREVENTING IMPACT GROUND PRESSURE FOR LOW GAS-PERMEABILITY COAL SEAM
Document Type and Number:
WIPO Patent Application WO/2019/184147
Kind Code:
A1
Abstract:
A method for efficiently preventing impact ground pressure for a low gas-permeability coal seam, comprising the following steps: step I, measuring the coal mechanical property; step II, determining the highest gas injection pressure for high pressure gas injection; step III, coal drilling; step IV, decoupling charge; step V, reserving high pressure pipelines in drilled holes (5); step VI, sealing the drilled holes (5); step VII, high pressure gas injection; and step VIII, detonating an explosive for pre-cracking anti-reflection and pressure relief. The method has safe constructions and is reliable. The drilled holes (5) are reasonably arranged in a coal seam to be mined, and the mixed high pressure gas of hydrogen and air is injected, thereby achieving detonation collaboration of hydrogen and the explosive, greatly increasing the porosity of the coal seam to be mined. The pre-cracking anti-reflection has a large radius and good effect, and the effect of preventing the impact ground pressure is significant.
Inventors:
MENG XIANGBAO (CN)
ZHANG YANSONG (CN)
ZHANG XINYAN (CN)
LIU BO (CN)
WANG XIANG (CN)
ZHANG YUYUAN (CN)
ZENG JUN (CN)
ZHANG YANSONG (CN)
ZHANG XINYAN (CN)
LIU BO (CN)
WANG XIANG (CN)
ZHANG YUYUAN (CN)
ZENG JUN (CN)
Application Number:
PCT/CN2018/095825
Publication Date:
October 03, 2019
Filing Date:
July 16, 2018
Export Citation:
Assignee:
UNIV SHANDONG SCIENCE & TECH (CN)
International Classes:
E21C41/18; E21C37/14; E21F7/00
Foreign References:
| CN108301811A | 2018-07-20 | |||
| CN108301861A | 2018-07-20 | |||
| CN108590737A | 2018-09-28 | |||
| CN108506001A | 2018-09-07 | |||
| CN105064967A | 2015-11-18 | |||
| CN102852506A | 2013-01-02 | |||
| CN107152303A | 2017-09-12 | |||
| CN104594866A | 2015-05-06 | |||
| CN104405358A | 2015-03-11 | |||
| US5474129A | 1995-12-12 |
Attorney, Agent or Firm:
QINGDAO ZHIDILINGCHUANG PATENT AGENCY CO., LTD (CN)
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