COAL BED PRETREATMENT FOR ENHANCED CARBON DIOXIDE SEQUESTRATION
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United States of America Patent
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Issued Date -
Jun 28, 2007
app pub date -
Nov 30, 2006
filing date -
Dec 2, 2005
priority date (Note) -
Abandoned
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Abstract
A method is claimed for enabling storage of greater volumes of carbon dioxide for sequestration while simultaneously enhancing methane recovery from the coal bed. The process is implemented by injecting hydrogen into a coal bed, such as a depleted underground coal deposit, at a temperature below about 800 degrees Centigrade (10); extracting the hydrogen together with methane from the deposit (20); separating the hydrogen from the methane (30); delivering the methane as a product of the process (40); reinjecting the separated hydrogen into the deposit to continue the process until sequestration of carbon dioxide is desired (50); optionally producing hydrogen from methane (60) and optionally injecting carbon dioxide for sequestration (70).
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