| 摘要 |
An improved method for the in situ recovery of methane from a plurality of coal seams beneath the earth's surface. At least one borehole is driven from the surface into a selected coal seam wherein a plurality of cavities are formed. The coal walls intermediate said cavities and the strata overlying said cavities are caused to collapse suddenly thereby forming fissure systems into the coal bearing rock strata from which methane is released. The methane is withdrawn via the fissure systems, cavities and the borehole. The cavities may be formed by chemical, physical or mechanical recovery of the coal.
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