METHOD OF COALS UNDERGROUND GASIFICATION AND DEGASSING (VERSIONS) Russian patent published in 2003 - IPC

FIELD: mining industry, particularly, underground mineless mining of horizontal or flat-lying coal seams or coal interlayers alternating with sedimentary rocks and usable for production of inflow of commercial gas. SUBSTANCE: according to the first version, for horizontal or flat-lying coal seams alternating with interlayers of sedimentary rocks gas-outlet hole is made horizontal and its bore is located in upper part of coal seam; air-supplying hole is drilled horizontally branched with parent hole located in lower part of upper coal seam. Drilled from parent hole are downward branch holes down to level of lower producing bore. According to the second version for horizontal or flat-lying coal seams alternating with sedimentary rocks interlayers, gas-outlet hole is made horizontal and its bore is located in upper part of upper coal seam, and air-supplying hole is drilled horizontally branched with parent hole located in lower producing coal seam and branch holes are drilled ascending from parent hole up to connection with gas-outlet hole. EFFECT: higher efficiency of degassing and subsequent underground gasification of horizontal of flat-lying coal seams alternating with sedimentary rocks interlayers for production of inflow commercial gas. 2 cl, 2 dwg