US 12,252,972 B1
Fluidized coal mining method utilizing self-energy storage of coal seam
Chaolin Zhang, Xuzhou (CN); Enyuan Wang, Xuzhou (CN); Xiaofei Liu, Xuzhou (CN); Zhonghui Li, Xuzhou (CN); Qiaozhen Jiang, Xuzhou (CN); Mingliang Liu, Xuzhou (CN); Peizhong Wang, Xuzhou (CN); and Wei Zeng, Xuzhou (CN)
Assigned to China University of Mining and Technology, Xuzhou (CN)
Filed by China University of Mining and Technology, Xuzhou (CN)
Filed on Oct. 31, 2024, as Appl. No. 18/933,000.
Application 18/933,000 is a continuation of application No. PCT/CN2024/107587, filed on Jul. 25, 2024.
Claims priority of application No. 202311152056.4 (CN), filed on Sep. 6, 2023.
Int. Cl. E21B 43/263 (2006.01); E21B 43/29 (2006.01); E21C 41/18 (2006.01)
CPC E21B 43/263 (2013.01) [E21B 43/29 (2013.01); E21C 41/18 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fluidized coal mining method utilizing self-energy storage of a coal seam, comprising following steps:
developing a mine roadway: detecting and determining a buried depth, a size and a dip angle of the coal seam to be mined, delineating different mining zones and a mining sequence; and drilling the coal seam through a well drilling system to form a lifting shaft; developing a roadway system along a bottom of the lifting shaft, and installing a ground equipment system on a ground; and wherein the roadway system is arranged below the coal seam;
uncovering coal actively: sending an explosive to the roadway system through the lifting shaft, sealing a top of the lifting shaft, detonating the explosive to disturb the coal seam so as to trigger a dynamic phenomenon of coal and gas outburst, and treating a fluid mixture formed by explosion through the ground equipment system;
mining coal in fluidization: according to a position of an outburst hole formed after the uncovering coal actively, determining a position of a coal-mining drilling well on the ground, drilling the coal-mining drilling well to an upper part of the roadway system through the well drilling system and stopping, forming a mining zone; and mining the mining zone;
backfilling a goaf: after a first mining zone is mined, forming the goaf, and backfilling the goaf by the ground equipment system to enable the goaf and the roadway system to form a gangue backfill zone; and
after the backfilling is completed, repeating above steps, and mining a next adjacent coal mining zone in turn until a mining of a whole coal seam is completed.