Method of recovery of natural gases from underground coal format

Details Method of recovery of natural gases from underground coal format Method of recovery of natural gases from underground coal format

1992-12-04

1994-07-26

Bagnell, David J.

Wells

Processes

Distinct, separate injection and producing wells

166274, 299 12, E21B 4300

Patent

active

053320360

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 The methane is withdrawn from the seam through the production well.

REFERENCES:
patent: 4043395 (1977-08-01), Every et al.
patent: 4883122 (1989-11-01), Puri et al.
patent: 5074357 (1991-12-01), Haines
patent: 5085274 (1992-02-01), Puri et al.
patent: 5099921 (1992-03-01), Puri et al.

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