Method for sealing underground hydraulic fracture drilled hole of coal mine in combined manner

摘要: The invention discloses a method for sealing an underground hydraulic fracture drilled hole of coal mine in combined manner. includes constructing the hole, then sequentially connecting second pvc (polyvinyl chloride) pipe, spindle-shaped pipe and first with one another, feeding into until distance from exposed end to orifice is 0.1m, respectively plugging certain positions by polyurethane; injecting slurry space between plugged aid injection pipe; high-pressure capsule position separated inner side 1m after solidified; enabling expand performing releasing pressure completed, taking out capsule; pipes gas network draining gas. diameter uniformly gradually reduced two ends middle front 2m, other 1m. has advantages that requirement on resistance performance drainage can be met, reused, process simple, potential safety hazards are prevented, efficiency obviously improved.