首页>
外国专利>
Method and apparatus for using pressure cycling and cold liquid CO2 for releasing natural gas from coal and shale formations
Method and apparatus for using pressure cycling and cold liquid CO2 for releasing natural gas from coal and shale formations
展开▼
机译:利用压力循环和冷液态co 2 sub>从煤和页岩地层释放天然气的方法和设备
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method and apparatus for sequestering carbon dioxide (CO2) gas and releasing natural gas from underground coal and/or gas shale formations using CO2 gas captured from the flue gas of a coal burning power plant, and processing it to produce cold liquid pressurized CO2, and injecting the cold liquid CO2 under pressure to create fractures within the formation and causing the CO2 to be adsorbed into the coal or gas shale and natural gas (CH4) to be desorbed, released and recovered. A special pressure cycling process is used to enable the pressure within the formation to be increased and decreased, including allowing the liquid CO2 to change phase to a gaseous CO2, and injecting the liquid CO2 under pressure repeatedly, which causes greater expansion of the proliferation zone within the formation, and more efficiently releases CH4.
展开▼