Title:
METHOD FOR INCREASING PERMEABILITY BY PULSE DETONATION FRACTURING IN COAL-BED GAS WELL
Document Type and Number:
WIPO Patent Application WO/2018/076737
Kind Code:
A1
Abstract:
Disclosed is a method for increasing permeability by pulse detonation fracturing in a coal-bed gas well, which method is applicable for mining in a coal-bed gas well for a coal bed with a low gas permeability. First, a positive electrode coal-bed gas well shaft (2) and a negative electrode coal-bed gas well shaft (3) are constructed from the ground to a coal bed (1), a fixed station (4) on which a positive electrode (5) is mounted and a high voltage pulse device (7) are lowered to a pre-permeability increase site of the coal bed (1) in the positive electrode coal-bed gas well shaft (2) via a derrick (11), and another fixed station (4) on which a negative electrode (6) is mounted is lowered to a pre-permeability increase site of the coal bed (1) in the negative electrode coal-bed gas well shaft (3) via the derrick (11); and then the coal bed (1) between the positive electrode (5) and the negative electrode (6) is broken down by using a high voltage, and coal-bed gas extraction is carried out on the positive electrode coal-bed gas well shaft (2) and the negative electrode coal-bed gas well shaft (3). A high energy generated using a high voltage electric impulse is directly applied to a coal reservoir to form a plasma channel in the coal bed (1) between the positive electrode (5) and the negative electrode (6), enormous energy instantaneously passes through the plasma channel, and the formed high-temperature thermal expansion force and shock wave act on the coal bed, thereby effectively increasing the number of cracks inside the coal bed and creating good conditions for coal-bed gas flow.
Inventors:
LIN BOQUAN (CN)
YAN FAZHI (CN)
ZHANG XIANGLIANG (CN)
KONG JIA (CN)
LIU TING (CN)
ZHU CHUANJIE (CN)
YAN FAZHI (CN)
ZHANG XIANGLIANG (CN)
KONG JIA (CN)
LIU TING (CN)
ZHU CHUANJIE (CN)
Application Number:
PCT/CN2017/089964
Publication Date:
May 03, 2018
Filing Date:
June 26, 2017
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
International Classes:
E21B43/26
Foreign References:
| CN106285608A | 2017-01-04 | |||
| CN106593388A | 2017-04-26 | |||
| CN104863561A | 2015-08-26 | |||
| CN102720528A | 2012-10-10 | |||
| CN102155254A | 2011-08-17 | |||
| US20110088905A1 | 2011-04-21 |
Attorney, Agent or Firm:
NANJING RUIHONG PATENT & TRADEMARK AGENCY (ORDINARY PARTNERSHIP) (CN)
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