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COAL MINE METHANE PRODUCTION BY VERTICAL BOREHOLES DRILLED FROM SURFACE
Abstract
Large amount of methane trapped in post-coal extraction gobs and galleries in abandonment hard coal mines could be valuable carrier of energy. Methane produced by vertical well could be used to generate both, heat and electricity. However there are many problems with efficiency production of this methane. In dependence of geological structure, coal seams layering and technology used to drilling vertical boreholes from the surface, coal mine methane (CMM) production could be profitable or gives economic losses. Within this article, author described some issues connected with CMM production from abandoned hard coal mines. Author proposed implementation of casing-while-drilling technology with down-hole hammer instead of traditional drilling bit. That technique will decrease hazard of overwhelm borehole wells during drilling into crushed, fractured layers. Based on literature overview and own market research, author presented drilling costs in a function of hypothetical borehole diameter and length.
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