Organic acid system for high temperature acidizing
AssigneeBaker Hughes Incorporated
InventorsTianping Huang, Paul M. McElfresh, Allen D. Gabrysch
Life of this patent
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Abstract
Dicarboxylic acids are useful in acidizing subterranean formations to improve their permeability, particularly at elevated temperature, e.g. between about 200° F. (92° C.) and about 400° F. (204° C.). Particularly suitable dicarboxylic acids include, but are not necessarily limited to, succinic acid, glutaric acid, adipic acid, and mixtures thereof.
Claims12
A method for increasing the permeability of a subterranean formation comprising:
- injecting an acid composition into the subterranean formation where the acid composition comprises at least one dicarboxylic acid;
- and
- contacting the subterranean formation with the acid composition for an effective period of time to improve the permeability of the formation in the absence of a mineral acid, except hydrofluoric acid.
A method for increasing the permeability of a subterranean formation comprising:
- injecting an acid composition into the subterranean formation where the acid composition comprises at least one dicarboxylic acid having a formula weight of 175 or less;
- and
- contacting the subterranean formation with the acid composition at a temperature between about 200° F. (92° C.) and about 400° F. (204° C.) for an effective period of time to improve the permeability of the formation in the absence of a mineral acid, except hydrofluoric acid.
A method for increasing the permeability of a subterranean formation comprising:
- injecting an acid composition into the subterranean formation where the acid composition comprises at least one dicarboxylic acid selected from the group consisting of succinic acid, glutaric acid, adipic acid, and mixtures thereof;
- and
- contacting the subterranean formation with the acid composition at a temperature between about 200° F. (92° C.) and about 400° F. (204° C.) for an effective period of time to improve the permeability of the formation, where the permeability improvement is achieved by a process selected from the group consisting of etching channels, dissolving scale, removing fines, and combinations thereof.
Dependencies are inferred from the claim text.