The invention discloses a
coal seam super-critical
carbon dioxide plugging device and method. The device comprises a front-end hole packer, a rear-end hole packer, a grouting
pipe, a super-critical
carbon dioxide injection
pipe and a temperature controller; the front-end hole packer is composed of a front-end hole packer
metal end head, a front-end hole packer heating device, a front-end hole packer
capsule and a front-end hole packer water injection
pipe; the rear-end hole packer is composed of a rear-end hole packer
capsule and a rear-end hole packer water injection pipe; the front-end hole packer and the rear-end hole packer are connected with the super-critical
carbon dioxide injection pipe through quick sealing connectors, and the super-critical carbon dioxide injection pipe is connected with a super-critical carbon dioxide air source; the grouting pipe is arranged between the front-end hole packer
capsule and the rear-end hole packer capsule; and the water injection pipe is connected with a high-pressure
water source. The plugging method is high in reliability and good in plugging effect; and efficient plugging of super-critical carbon dioxide in a
coal seam is achieved, it is ensured that the carbon dioxide injected into a
drill hole is in a super-critical state, and application and promotion of the super-critical carbon dioxide in
coal-seam gas yield increasing are facilitated.