This invention discloses a method for
methane extraction and closed-loop carbon fixation in
coal seams using hot
flue gas-driven
combustion-explosion fracturing. First, each
horizontal branch well is divided into sections, and perforations are constructed in each section. Then, CH4 is used in each section. 4
Combustion-explosive fracturing technology utilizes in-situ synergistic
combustion-explosion reactions to generate gas
impact perforation fractures, allowing them to further develop and expand into a fracture network. Then, hot
flue gas is sequentially injected into each
horizontal branch well. Due to its high temperature, the hot
flue gas promotes CH4 (
chemical oxygen demand) in the
coal seam. 4 Gas
desorption, and CO in hot
flue gas 2 SO 2 NO 2 Due to its
competitive adsorption advantage, it can displace a large amount of CH4 adsorbed in extra-thick
coal seams. 4 Gas, then hot
flue gas and CH 4 The gas continues to be utilized in a
closed loop, improving the efficiency of coal seam
methane extraction while simultaneously achieving hot
flue gas sequestration. Through this continuous closed-loop utilization process, the efficiency of
methane combustion and fracturing, hot flue gas sequestration, and CH4 extraction in various areas of extra-thick coal seams is maximized. 4 Extraction efficiency.