Reverse combustion linking is a key operation of Underground Coal Gasification (UCG). UCG is a gasification process carried on in non-mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. Reverse combustion linking is a method of connecting the process wells within a coal seam, which includes injection of an oxidant into one well and ignition of coal in the other so that the combustion zone propagates towards the source of oxidant thereby establishing a low hydraulic resistance path between the two wells.

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