The invention relates to the technical field of
coal seam hydraulic
permeation enhancement, and discloses a hydraulic
permeation increasing process for a large-dip-angle low-permeability
coal seam which comprises the following steps: step (1), drilling: drilling a
coal seam to form a fracturing hole; step (2), a hole sealing process is determined, placing two packers in each fracturing hole, wherein the two packers are distributed in a spaced mode, a plurality of
branch holes communicated with the fracturing hole are formed in one side of the fracturing hole, the intersection point between the
branch holes and the fracturing hole is a
branch point, a fracturing
pipe is inserted into the fracturing hole, and a screen
pipe section of the fracturing
pipe is put into the position of the branch hole needed to be fractured; step (3), fracturing
parameter design, including pump
injection pressure parameter and injection liquid quantity
parameter design; step (4),
type selection of fracturing equipment; and (5) fracturing: after the fracturing hole is sealed through a hole sealing material, after the hole sealing material is solidified for 12-48 h, connecting a pipeline and equipment, and starting a pump for water injection fracturing. The phenomenon of
water leakage caused by poor hole sealing effect in the
hydraulic fracturing process can be avoided.