UNDERGROUND GASIFICATION IGNITION METHOD
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United States of America Patent
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Sep 1, 2016
app pub date -
Mar 27, 2014
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Dec 23, 2013
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Abstract
An underground gasification ignition method comprises the following steps: making a directional drilling and a vertical well to construct an underground gasification furnace; using a cold fracturing method to pre-penetrate a coal seam; and igniting in the vertical well at an end of the directional drilling.
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