US 12,241,340 B1
Coal and coalbed methane mining system based on ground drilling, method and related device
Yifan Zeng, Beijing (CN); Donghui Yang, Beijing (CN); Qiang Wu, Beijing (CN); Junhao Ren, Beijing (CN); Zilong Yuan, Beijing (CN); Fulong Zhai, Beijing (CN); Jia Zhao, Beijing (CN); and Hao Li, Beijing (CN)
Assigned to CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING, Beijing (CN)
Filed by CHINA UNIVERSITY OF MINING AND TECHNOLOGY, BEIJING, Beijing (CN)
Filed on Oct. 14, 2024, as Appl. No. 18/915,252.
Claims priority of application No. 202410051937.5 (CN), filed on Jan. 12, 2024.
Int. Cl. E21B 43/00 (2006.01); E21B 7/04 (2006.01); E21B 7/18 (2006.01); E21B 43/29 (2006.01); E21B 43/34 (2006.01)
CPC E21B 43/006 (2013.01) [E21B 7/18 (2013.01); E21B 43/29 (2013.01); E21B 43/34 (2013.01); E21B 7/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A coal and coalbed methane mining system based on ground drilling, comprising:
a drilling component;
a coal mining drill bit, set at a predetermined end of a directional borehole in a coal seam, connected to the drilling component through a connecting pipeline;
a ground facility group, connected to the drilling component, to provide coal cutting slurry for the coal mining drill bit, receive reflux slurry carrying coal and coalbed methane, and precipitate and separate the reflux slurry carrying the coal and the coalbed methane; wherein,
the coal mining drill bit is with a strip-shaped structure, with at least two pairs of nozzles installed on a side wall; the coal mining drill bit is configured to use the nozzles to spray the coal cutting slurry for mining the coal seam, and spray the coal cutting slurry to form a pressure on a coal mining site so that the reflux slurry formed is fed into the directional borehole and delivered to the drilling component and the ground facility group through the directional borehole;
the nozzles of the coal mining drill bit comprise: at least one pair of coal cutting nozzles, wherein, one half of the coal cutting nozzles are direct jet nozzles and the other half of the coal cutting nozzles are rotary jet nozzles; wherein, the direct jet nozzles are used for a hydraulic deep penetration of the coal seam, and the rotary jet nozzles are used to expand a fracture surface area of the coal seam and produce an advance pre-splitting; and
the at least one pair of coal cutting nozzles are distributed along a circumferential direction of a section on the side wall of the coal mining drill bit uniformly; the two types of the coal cutting nozzles are alternately arranged at intervals and vertically on the side wall; and the coal cutting nozzles are configured to extract coal from the coal seam by spraying the coal cutting slurry.
 
5. A coal and coalbed methane mining method based on ground drilling applied in the coal and coalbed methane mining system based on ground drilling according to claim 1, comprising:
obtaining coal seam information and determining locations of the drilling component and the ground facility group;
in response to completing a directional drilling and a setting of the coal mining drill bit according to preset conditions, controlling the ground facility group to provide pressurized coal cutting slurry to the coal mining drill bit through the drilling component and the connecting pipeline;
controlling the coal mining drill bit to open nozzles, and controlling the drilling component to drive the connecting pipeline and the coal mining drill bit to retract and spray the coal cutting slurry to mine the coal seam; and
controlling the ground facility group to receive reflux slurry carrying coal and coalbed methane from a directional borehole through the drilling component.