JCIPRNET
Method of extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
A method of extracting gas from a tectonically-deformed coal seam in-situ by depressurizing a horizontal well cavity is provided. A horizontal well drilling and reaming subsystem constructs a U-shaped well in which a horizontal well adjoins a vertical well, and performs a reaming process on a horizontal section of the horizontal well to enlarge a 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 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.
XUZHOU OLIVINE GEOSCIENCE & GEOTECH CO., LTD China University of Mining and Technology
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Haiwen Huazhou Hongjie Ran Shuxun Shuyun Huihu Zicheng Changjiang Liwen Xiaozhi Shiqi Jinlong
Wang Huang Xu Wang Sang Zhu Liu Li Liu Cao Zhou Liu Jia