Aqueous modified acid compositions and methods of using the same
An aqueous modified or synthetic acid composition comprising: an acid; a first component comprising: an amine and a carboxylic acid group; a second component comprising: an amine and a sulfonic acid group; wherein said first component and said acid are present in a molar ratio ranging from 1:3 to 1:15, more preferably from 1:3 to 1:12.5. Said acid composition is preferably used in acidizing or stimulating dolomite formations. Disclosed also are methods involving the use of said acid composition.
1. An aqueous modified acid composition comprising:
an acid;
a first component comprising an amino acid having a single carboxylic acid group, the amino acid selected from the group consisting of lysine, glycine, alanine, methionine, histidine, arginine, serine, proline, cysteine, threonine, and selenocysteine;
a second component having a structure comprising an amine group and a sulfonic acid group;
wherein said first component and said acid are present in a molar ratio ranging from 1:3 to 1:12.5, and
wherein the aqueous modified acid composition acidizes or stimulates hydrocarbon-containing dolomite formations and hydrocarbon-containing limestone formations to create wormholes therein.
2. The aqueous modified acid composition according to claim 1 wherein the acid is selected from the group consisting of: HCl; and amino acid:HCl blends.
3. The aqueous modified acid composition according to claim 1 wherein the second component is selected from the group consisting of: taurine; taurocholic acid; tauroselcholic acid; 5-Taurinomethyluridine; 5-taurinomethyl-2-thiouridine; homotaurine (tramiprosate); and acamprosate.
4. The aqueous modified acid composition according to claim 1 wherein the second component is taurine.
5. The aqueous modified acid composition according to claim 1 , wherein the composition is stable at temperatures of up to at least 80° C.
6. The aqueous modified acid composition according to claim 1 , wherein the composition is stable at temperatures of up to at least 120° C.
7. The aqueous modified acid composition according to claim 1 , wherein the composition is stable at temperatures of up to at least 150° C.
8. The aqueous modified acid composition according to claim 1 , wherein the composition has a pH of no more than 1.5.
9. The aqueous modified acid composition according to claim 1 , wherein the acid is present in an amount ranging from 5 to 40 wt % of the aqueous modified acid composition.
10. The aqueous modified acid composition according to claim 1 , wherein the acid is present in an amount ranging from 10 to 30 wt % of the aqueous modified acid composition.
11. The aqueous modified acid composition according to claim 1 , wherein the second component is present in an amount ranging from 1 to 20 wt % of the aqueous modified acid composition.
12. The aqueous modified acid composition according to claim 1 , wherein the second component comprising is present in an amount ranging from 2 to 15 wt % of the aqueous modified acid composition.
13. The aqueous modified acid composition according to claim 1 , wherein the second component is present in an amount ranging from 5 to 10 wt % of the aqueous modified acid composition.
14. The aqueous modified acid composition according to claim 1 , wherein the aqueous modified acid composition is provided in a geological formation for the dissolution of dolomite therefrom.
15. A method to selectively dissolve dolomite over calcium carbonate rock, said method comprising:
providing a composition according to claim 1 ;
injecting said composition downhole into a rock formation containing dolomite; and
contacting the rock formation containing dolomite with said composition for a period of time sufficient to dissolve dolomite and create wormholes in the rock formation.
16. A method of acidizing or stimulating a hydrocarbon-containing dolomite formation, said method comprising:
providing a composition according to claim 1 ;
injecting said composition downhole into said dolomite formation at a pressure below a fracking pressure of the formation; and
contacting said dolomite formation with said composition for a period of time sufficient to create wormholes in said dolomite formation.
17. A method of acidizing or stimulating a hydrocarbon-containing limestone formation, said method comprising:
providing a composition according to claim 1 ;
injecting said composition downhole into said limestone formation at a pressure below a fracking gradient level of the limestone formation; and
contacting said limestone formation with said composition for a period of time sufficient to create wormholes in said limestone formation.
18. A method of creating wormholes in a hydrocarbon-containing formation, said method comprising:
providing a composition according to claim 1 ;
injecting said composition downhole at a desired injection rate into said formation at a pressure below the fracture gradient level of the formation; and
contacting said formation with said composition for a period of time sufficient to create wormholes in said formation.
19. The aqueous modified acid composition according to claim 1 , wherein the second component is taurine.
20. An aqueous modified acid composition comprising:
an acid;
a first component comprising an amino acid having a single carboxylic acid group, the amino acid selected from the group consisting of lysine, glycine, alanine, methionine, histidine, arginine, serine, proline, cysteine, threonine, and selenocysteine;
a second component comprising taurolidine or tauromustine;
wherein said first component and said acid are present in a molar ratio ranging from 1:3 to 1:12.5, and
wherein the aqueous modified acid composition acidizes or stimulates hydrocarbon-containing dolomite formations and hydrocarbon-containing limestone formations to create wormholes therein.