Patent RU-2685359-C1 (RU)
Title: Method of constructing network priority gas migration paths, as well as gas discharge and extraction
Inventor: LIN BAIQUAN
IPC: E21F7/00
Filed: 2017-12-01
Granted: 2019-04-17
Abstract: FIELD: mining.SUBSTANCE: invention relates to mining and can be used for degassing of coal beds. Disclosed is a method of constructing network priority gas migration paths, as well as gas removal and extraction, which includes the following stages: determining graphical characteristic of voltage distribution of working surface and determination of length L of voltage advancement; at the opposite places in the main ventilation gate (2) and the side air gate with limited inlet (1) respectively creating hole of formation of crack (4) inside stable roof (14) above coal layer (8) in the direction facing working surface (7), performing contour drilling of deep well by means of subversive process in hole of formation of crack (4) so that a large number of cracks are created by explosive work and formed around hole of formation of crack (4) inside stable roof (14), weakening connection between stable roof (14) and overlying layer of stable roof (20), and also causing and accelerating formation of cracks from separation of layers (18). Further, at the point where crack creation hole (4) is designed, directed propagation of crack and expansion of hole (5) inside stable roof (14) over coal bed (8) is made in direction facing working surface (7), performing contour drilling of deep well by means of blasting process in directed propagation of crack and expansion of hole (5) so that large number of cracks are formed around directed propagation of crack and expansion of hole (5) and are connected to cracks formed around hole of formation of crack (4), to provide control over change and development of cracks. Then, in the area where crack creation hole (4) is designed, hole of branch of rupture (3) is built in stable roof (14) above coal bed (8) in direction facing working surface (7) to weaken zone of branching of stable roof (14) and control the position of the bridging break of stable roof (14). Further, at the point where crack creation hole (4) is designed, hole of connection of crack (6) is built into stable roof (14) above coal bed (8) in direction opposite to working surface (7), performing contour drilling of deep well by means of blasting process in hole of connection of crack (6) so that connection hole of crack (6) is connected to cracks formed around hole of formation of crack (4), directed propagation of crack and expansion of hole (5), as well as opening holes of fracture (3), eventually forming group of artificially directed cracks (15), having specific directions and morphological characteristics inside stable roof (14). Then angle is extracted on working surface (7) in usual way. Also, wells are constructed for removal and extraction of gas (11) in the zone of rupture from separation of formations (19) over worked space (9) in limited production (10) behind working surface (7) and centralized removal and extraction of gas (16) in zone of fractures of strata separation (19).EFFECT: technical result is providing a simple and efficient method of extracting methane gas from the seams being mined.5 cl, 3 dwg