Reducing aluminum compound precipitation following subterranean formation acidizing
AssigneeHalliburton Energy Services, Inc.
InventorsChris E. Shuchart, Rick D. Gdanski
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Abstract
Methods and compositions for reducing the precipitation of aluminum compounds following the contact of an aluminum containing subterranean formation with an acid solution containing hydrofluoric acid are provided. In accordance with the methods, a hydroxy carboxylic acid is combined with the hydrofluoric acid solution and the subterranean formation is contacted with the resulting acid solution.
Claims25
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising:
- contacting said formation with a preflush solution including water and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said preflush solution in an amount in the range of from 2.1% to about 10% by weight of said preflush solution;
- and
- after contacting said formation with said preflush solution, contacting said formation with an acidizing composition including water, hydrofluoric acid and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said acidizing composition in an amount in the range of from 2.1% to about 10% by weight of said acidizing composition.
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising:
- contacting said formation with an acidizing composition including water, hydrofluoric acid and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said acidizing composition in an amount in the range of from 2.1% to about 10 by weight of said acidizing composition;
- and
- after contacting said formation with said acidizing composition, contacting said formation with an overflush solution including water and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said overflush solution in an amount in the range of from 2.1% to about 10% by weight of said overflush solution.
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising contacting the formation with an acidizing composition including:
- water;
- hydrofluoric acid;
- and
- at least one hydroxy carboxylic acid present in an amount in the range of from 2.1% to about 10% by weight of said acidizing composition, said hydroxy carboxylic acid being at least one acid selected from the group consisting of malic acid, lactic acid and hydroxyacetic acid.
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising contacting the formation with an acidizing composition including:
- water;
- hydrofluoric acid present in an amount in the range of from about 0.1% to about 6% by weight of said composition;
- at least one hydroxy carboxylic acid present in an amount in the range of from 2.1% to about 10% by weight of said acidizing composition;
- and
- hydrochloric acid present in an amount in the range of from about 5% to about 15% by weight of said composition.
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising contacting the formation with an acidizing composition including:
- water;
- hydrochloric acid;
- hydrofluoric acid;
- and
- at least one hydroxy carboxylic acid present in an amount in the range of from 2.1% to about 10% by weight of said acidizing composition.
Dependencies are inferred from the claim text.