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US 4,391,327 AGranted
Solvent foam stimulation of coal degasification well
AssigneeConoco Inc.
InventorLeonard J. De Carlo
Life of this patent
Estimating the term…
Abstract
A foamed fluid containing a coal solvent is injected into a coal seam to improve the gas permeability of the coal.
Claims5
A method for improving the gas drainage characteristics of a coal seam comprising:
- (a) injecting into said coal seam a foamed fluid comprised of a liquid solvent selected from the group consisting of toluene, pyridine, xylene, tetralin, anthracene, coal tar and mixtures thereof, a foam-producing surfactant and a high pressure gas, said foamed fluid containing an amount of said solvent effective to partially dissolve coal contacted by said foamed fluid;
- (b) maintaining said foamed fluid in contact with said coal seam for a period of time sufficient for said solvent to partially dissolve coal contacted therewith thereby improving the gas drainage characteristics of said coal seam;
- and
- (c) recovering injected material and naturally occurring gas from said coal seam.
1 more element
Dependencies are inferred from the claim text.