Non-regulated synthetic acid compositions for use as alternatives to conventional acids in the oil and gas industry
A synthetic acid composition for use in oil industry activities comprising urea and methanesulphonic acid in a molar ratio of not loss than 1.0:1, a metal iodide or iodate and an alcohol or derivative thereof.
1. A synthetic acid composition for use in oil industry activities, said composition comprising:
water, urea and methanesulphonic acid, wherein no less than 97% of the weight of the composition is comprised of the water, the urea and the methanesulphonic acid and the urea and the methanesulphonic acid have a molar ratio of not less than 1.0:1;
a metal iodide or iodate in an amount of no more than 1% by weight of the weight of the composition; and
a corrosion inhibitor, wherein said corrosion inhibitor comprises—an alcohol or derivative thereof in an amount of no more than 1% by weight of the weight of the composition,
wherein the synthetic acid composition has a pH less than 1.0 and a shelf life of greater than 12 months.
2. The synthetic acid composition according to claim 1 , wherein the urea and the methanesulphonic acid are in a molar ratio of 1.2:1.
3. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is selected from the group consisting of: cuprous iodide; potassium iodide; sodium iodide; and lithium iodide.
4. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is potassium iodide.
5. The synthetic acid composition according to claim 1 , wherein the alcohol or derivative thereof is an alkynyl alcohol or derivative thereof.
6. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is propargyl alcohol or a derivative thereof.
7. The synthetic acid composition according to claim 6 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 1.0% w/w.
8. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is present in a concentration ranging from 0.01 to 0.5% w/w.
9. The synthetic acid composition according to claim 5 , wherein the alkynyl alcohol or derivative thereof is present in a concentration of 0.2% w/w.
10. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 10000 ppm.
11. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 5000 ppm.
12. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration of 1000 ppm.
13. The synthetic acid composition according to claim 1 , wherein no less than 98.9% of the weight of the composition is comprised of the water, the urea and the methanesulphonic acid.
14. The synthetic acid composition according to claim 13 for use in solubilizing CaCO 3 from rock formations.