PROCEDURE FOR UNDERGROUND GASIFICATION OF COAL

摘要

FIELD: oil and gas industry.SUBSTANCE: method involves drilling of an air injection hole and gas removal hole in a coal bed, including setting of pipe string, connection of holes in the bed by hydraulic fracturing with formation of a channel. Ferric oxide is loaded into a channel; at that quantity of ferric oxide is equal to 0.25-0.35 of the mass of gasifiable coal bed. Coal ignition is made by coal bed heating up to 300-500°C. Superheated steam of the same temperature is supplied to the channel and combustible gas with hydrogen content of 17-34% and calorific capacity of 6.5-15.2 MJ/mdepending on the process temperature is removed through the gas removal hole.EFFECT: increase of calorific capacity and hydrogen quantity for combustible gas, degree of coal conversion into combustible gas.1 dwg