Title:
METHOD FOR INTEGRATED DRILLING, SLOTTING AND OSCILLATING THERMAL INJECTION FOR COAL SEAM GAS EXTRACTION
Document Type and Number:
WIPO Patent Application WO/2016/110186
Kind Code:
A1
Abstract:
A method for combining integrated drilling and slotting with oscillating thermal injection to enhance coalbed gas extraction, applicable to managing gas extraction from microporous, low-permeability, high-adsorption coal seam areas. A number of slots (5) are formed within a thermal injection/extraction borehole (3) by means of integrated drilling and slotting technology; a steam generator (7) is then used to force high-pressure, cyclically temperature-changing steam into said borehole (3); the steam passing through a spinning oscillating-pulse jet nozzle (6) forms an oscillating superheated steam, heating the coal body. The present method overcomes the limitations of simple permeability-increasing techniques, the slotting by means of hydraulic pressure significantly increasing the pressure relief range of a single borehole and forming a fracture network that provides channels for passage of the superheated steam, while oscillating variation in steam temperature and pressure also promote crack propagation and perforation of the coal body; the combined effect of the two enhances the efficiency of gas desorption and extraction.
Inventors:
LIN BAIQUAN (CN)
GUO CHANG (CN)
ZOU QUANLE (CN)
LIU TING (CN)
ZHU CHUANJIE (CN)
KONG JIA (CN)
YAN FAZHI (CN)
YAO HAO (CN)
HONG YIDOU (CN)
GUO CHANG (CN)
ZOU QUANLE (CN)
LIU TING (CN)
ZHU CHUANJIE (CN)
KONG JIA (CN)
YAN FAZHI (CN)
YAO HAO (CN)
HONG YIDOU (CN)
Application Number:
PCT/CN2015/098156
Publication Date:
July 14, 2016
Filing Date:
December 22, 2015
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
International Classes:
E21B43/24; E21F7/00; E21B43/26
Foreign References:
| CN104696003A | 2015-06-10 | |||
| CN101832149A | 2010-09-15 | |||
| CN102400669A | 2012-04-04 | |||
| CN101418679A | 2009-04-29 | |||
| RU2122122C1 | 1998-11-20 | |||
| RU2209315C2 | 2003-07-27 |
Attorney, Agent or Firm:
JW IP LAW FIRM (CN)
北京德崇智捷知识产权代理有限公司 (CN)
北京德崇智捷知识产权代理有限公司 (CN)
Download PDF: