- 专利标题: PERMEABILITY ENHANCEMENT METHOD FOR COALBED METHANE WELLS BY USING ELECTRIC PULSE DETONATION FRACTURING TECHNOLOGY
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申请号: US15767880申请日: 2016-12-15
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公开(公告)号: US20200240246A1公开(公告)日: 2020-07-30
- 发明人: Bai quan LIN , Fazhi YAN , Xiangliang ZHANG , Jia KONG , Ting LIU , Chuanjie ZHU
- 申请人: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
- 申请人地址: CN Jiangsu
- 专利权人: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
- 当前专利权人: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
- 当前专利权人地址: CN Jiangsu
- 优先权: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@4c54accf
- 国际申请: PCT/CN2016/110047 WO 20161215
- 主分类号: E21B43/00
- IPC分类号: E21B43/00 ; E21B43/26
摘要:
A permeability enhancement method for coalbed methane wells by using electric pulse detonation fracturing technology is applicable to exploitation of coalbed methane wells in coal beds with low permeability. Firstly, a positive electrode coalbed methane wellbore and a negative electrode coalbed methane wellbore are constructed from the ground surface to a coal bed. A fixed platform installed with a positive electrode and a high-voltage pulse device are placed, by using a derrick, downwards to a predetermined permeability enhancement portion of the coal bed in the positive electrode coalbed methane wellbore, and another fixed platform installed with a negative electrode is placed, by using a derrick, downwards to a predetermined permeability enhancement portion of the coal bed in the negative electrode coalbed methane wellbore. The coal bed between the positive electrode and the negative electrode is broken down by using a high voltage, and coalbed methane extraction is carried out in the positive electrode coalbed methane wellbore and the negative electrode coalbed methane wellbore. A large amount of energy produced by high-voltage electric pulse directly acts on the coal reservoir to form a plasma channel in the coal bed between the positive electrode and the negative electrode. The large amount of energy instantly passes through the plasma channel, and the produced high-temperature thermal expansion force and shock waves act on the coal bed, such that the number of cracks in the coal bed is effectively increased and a favorable condition is created for flowing of coalbed methane.