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US20200240246A1_PERMEABILITY ENHANCEMENT METHOD FOR COALBED METHANE WELLS BY USING ELECTRIC PULSE DETONATION FRACTURING TECHNOLOGY

专利基本信息
申请号US15767880申请日2016-12-15
公开(公告)号US20200240246A1公开(公告)日2020-07-30
申请公布号US20200240246A1申请公布日2020-07-30
分类号E21B43/00;E21B43/26分类土层或岩石的钻进;采矿
发明人Bai quan LIN; Fazhi YAN; Xiangliang ZHANG; Jia KONG; Ting LIU; Chuanjie ZHU申请(专利权)人
CHINA UNIVERSITY OF MINING AND TECHNOLOGY
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地址Jiangsu CN
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.
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