- 专利标题: SYSTEM FOR EXTRACTING GAS FROM TECTONICALLY-DEFORMED COAL SEAM IN-SITU BY DEPRESSURIZING HORIZONTAL WELL CAVITY
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申请号: US16960023申请日: 2018-10-18
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公开(公告)号: US20200340335A1公开(公告)日: 2020-10-29
- 发明人: Shuxun SANG , Shiqi LIU , Liwen CAO , Xiaozhi ZHOU , Haiwen WANG , Huihu LIU , Zicheng LI , Huazhou HUANG , Changjiang LIU , Hongjie XU , Ran WANG , Jinlong JIA , Shuyun ZHU
- 申请人: China University of Mining and Technology , XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO., LTD
- 申请人地址: CN Jiangsu CN Jiangsu
- 专利权人: China University of Mining and Technology,XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO., LTD
- 当前专利权人: China University of Mining and Technology,XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO., LTD
- 当前专利权人地址: CN Jiangsu CN Jiangsu
- 优先权: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@210a616d
- 国际申请: PCT/CN2018/110868 WO 20181018
- 主分类号: E21B43/12
- IPC分类号: E21B43/12 ; E21B7/04 ; E21B7/18 ; E21B10/32 ; E21B15/04 ; E21F17/18 ; E21C41/18
摘要:
A system for extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity is provided. A horizontal well is constructed by a horizontal well drilling and reaming subsystem and adjoins a vertical well to form a U-shaped well, and a horizontal section of the horizontal well is reamed to enlarge hole diameter. A horizontal well hole-collapse cavity-construction depressurization excitation subsystem performs pressure-pulse excitation and stress release on the horizontal well of tectonically-deformed coal bed methane, and hydraulically displaces a coal-liquid-gas mixture such that the mixture is conveyed towards a vertical well section along a depressurizing space. A product lifting subsystem further pulverizes the coal and lifts the mixture towards a wellhead of a vertical well. A gas-liquid-solid separation subsystem separates the coal, liquid and gas. A monitoring and control subsystem detects and controls the operation conditions and the execution processes of technical equipment in real time.
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