Method of recovery of natural gases from underground coal formations
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United States of America Patent
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Jul 26, 1994
Issued Date -
N/A
app pub date -
Dec 4, 1992
filing date -
May 15, 1992
priority date (Note) -
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Abstract
Methane is produced from a coal seam penetrated by an injection well and a gas production well by first introducing liquefied or gaseous carbon dioxide through the injection well and into the coal seam and subsequently introducing a weakly adsorbable gas through the injection well and into the coal seam. As the weakly adsorbable gas passes through the coal seam, it forces the carbon dioxide through the seam. If the carbon dioxide is in liquefied form, it evaporates as it moves through the seam, and the carbon dioxide gas desorbs methane from the coal and sweeps it toward the production well. The methane is withdrawn from the seam through the production well.
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