METHOD FOR UNDERGROUND GASIFICATION Russian patent published in 2010 - IPC E21B43/295 

FIELD: mining.

SUBSTANCE: invention is related to mining industry, namely to methods for underground gasification. Horizontal sections of wells are arranged in coal bed. Wells linkage is carried out, as well as firing and blast supply. Productive gas is taken away with formation of pipelines on horizontal sections of wells and displacement of their outlet holes along well as coal bed is mined by gasification. Horizontal sections of wells in coal bed is formed with length that at least twice exceeds distance between wells. Wells are arranged on bed soil and formed with higher diametre, and for this purpose installations of directed drilling are used. Pipelines formed in horizontal wells are made of material with melt temperature of up to 150°C, and their walls are equipped with perforation. Horizontal unsealing wells are drilled in coal massif over wells that produce gas generator, within the limits of its design contour. They are used to impregnate coal massif with liquid carbon dioxide, afterwards wellheads are tightly sealed. Stable production of high-calorie gas is maintained with high completeness of coal bed inventory gasification, independently on its capacity and coal strength.

EFFECT: simplified realisation of method.

5 cl, 4 dwg