Title:
METHOD OF INCREASING PERMEABILITY OF COAL SEAM USING HIGH-POWER ELECTRIC BLASTING ASSISTED BY HYDRAULIC FRACTURING FROM BOTTOM DRAINAGE ROADWAY
Document Type and Number:
WIPO Patent Application WO/2017/075935
Kind Code:
A1
Abstract:
A method of increasing the permeability of a coal seam using high-power electric blasting assisted by hydraulic fracturing from a bottom drainage roadway, configured to efficiently extract gas from a coal seam having a high gas content and low gas permeability. The method comprises: first using a drilling machine to work on a coal seam (2) from a bottom drainage roadway (1) to create a borehole for electric pulse fracturing (4), and using hydraulic fracturing to create cracks in the electric pulse fracturing borehole (4); then using a high-voltage pulse discharger (6) to discharge electricity into water to generate a shock wave acting on a medium, and accordingly creating a large number of gaps and facilitating further expansion and mutual communication of the original cracks; and at the same time, continuously developing, through mutual action of an increasing pressure due to the hydraulic fracturing process and pulse waves repeatedly impacting on the medium, the cracks in the coal seam to form a crack network, such that passages for gas removal are provided, and the permeability of the coal seam is significantly improved, thereby realizing efficient gas extraction.
Inventors:
LING BAIQUAN (CN)
GUO CHANG (CN)
YAN FAZHI (CN)
ZHU CHUANJIE (CN)
ZOU QUANLE (CN)
LIU TING (CN)
KONG JIA (CN)
GUO CHANG (CN)
YAN FAZHI (CN)
ZHU CHUANJIE (CN)
ZOU QUANLE (CN)
LIU TING (CN)
KONG JIA (CN)
Application Number:
PCT/CN2016/077970
Publication Date:
May 11, 2017
Filing Date:
March 31, 2016
Export Citation:
Assignee:
UNIV CHINA MINING & TECH (CN)
International Classes:
E21F7/00; E21B43/26
Foreign References:
| CN104832149A | 2015-08-12 | |||
| CN105298462A | 2016-02-03 | |||
| CN104563990A | 2015-04-29 | |||
| CN201687513U | 2010-12-29 | |||
| EP2527586A1 | 2012-11-28 | |||
| US20130306322A1 | 2013-11-21 |
Attorney, Agent or Firm:
NANJING RUIHONG PATENT & TRADEMARK OFFICE (ORDINARY PARTNERSHIP) (CN)
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