The invention discloses an underground
coal mine hydraulic sand fracturing
system and method. The underground
coal mine hydraulic sand fracturing
system comprises a
water supply system, a fluid
distribution system, a sand mixing system, a fracturing system and a high-pressure manifold system; the fracturing system is formed by two fracturing pump groups in parallel; the high-pressure manifold system comprises a Y-shaped tee, and two inlet channels of the Y-shaped tee separately communicate with outlets of the two fracturing pump groups; and the fluid
distribution system comprises
two fluid distribution pools. The fracturing method is implemented based on the fracturing system and comprises the steps that fracturing liquid is prepared by densifiers, crosslinking agents, anti-swelling agents, gel breakers and water according to proportion; the particle size of a supporting agent is 40-70 meshes, and the
volume density of ceramsite sand is 1.25g / cm<3>; and fracturing is carried out according to the sequence of first
hydraulic fracturing seam generating and later fracturing liquid sand-carrying fracturing support. The underground
coal mine hydraulic sand fracturing system has the beneficial effects that the fracturing system is simple in structure and reasonable in
layout, and is suitable for sand-carrying fracturing use of underground narrow and small or long and narrow space; andthe fracturing liquid prepared by the fracturing method has suspended sand characteristic, can be suitable for upward drilling sand-carrying fracturing, and has the
environmental protection characteristic of being capable of directly discharged.