METHOD FOR UNDERGROUND GASIFICATION OF TICK COAL BEDS Russian patent published in 2010 - IPC E21B43/295 

FIELD: mining.

SUBSTANCE: invention relates to mining, in particular - to underground gasification of coal beds at the deposit location. The method for underground gasification of thick coal beds involves the bed separation with the help of directed bed wells into columns and separation of the columns into blocks with the help of vertical wells drilled to reach the lower layer roof. The method is implemented in two stages: at the first stage of performs gasification within the bed lower layer block with the help of bed wells with part of them used for blowing delivery while the other part is used for generator gas outlet. At the second stage blowing is delivered along the bed wells and the coal remaining in the block is gasified; while doing that one opens the vertical wells located within the block for generator gas to be discharged through them. After completion of gasification of the coal deposits within a specific block one performs gasification of the next block beginning with the lower layer and having preliminarily cut off the vertical wells.

EFFECT: improved efficiency of gasification of thick coal beds.

2 cl, 5 dwg