Stimulation of coalbed methane production
AssigneeExxon Chemical Patents Inc.
InventorsDennis A. Williams, James R. Looney, Michael W. Conway, Robert A. Swenson
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Abstract
A coalbed formation is stimulated to improve the recovery of methane which involves injecting into the coalbed formation an aqueous acid solution containing an organic amphoteric tertiary ammonium compound having from 1 to 3 tertiary ammonium groups, each N of which contains at least one C.sub.3 to C.sub.4 unsaturated carboxylic acid group, and wherein the compound contains a terminal benzyl or C.sub.5 -C.sub.19 alkyl group.
Claims7
A method of recovering methane from a coalbed formation which comprises injecting into the formation an aqueous acid solution containing an effective amount of an organic tertiary ammonium surfactant having the following formula:
- ##STR7## where R.sub.1 is independently a benzyl group or C4-C.sub.8 alkyl group;
- R.sub.2 is independently a propanoic or 2-methyl propanoic acid group;
- and
- X is independently Cl, HCOO, NH.sub.2 SO.sub.3 or CH.sub.3 COO.
Dependencies are inferred from the claim text.