Synthetic acid compositions alternatives to conventional acids in the oil and gas industry
A synthetic acid composition for use in oil industry activities is disclosed. The composition in a preferred embodiment comprises urea and hydrogen chloride in a molar ratio of not less than 0.1:1; and a metal iodide or iodate. Optionally, a phosphonic acid derivative may be added to the composition.
1. A synthetic acid composition for use in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1; and
a metal iodide or iodate.
2. The synthetic acid composition according to claim 1 , wherein the urea and hydrogen chloride are in a molar ratio of not less than 0.5:1.
3. The synthetic acid composition according to claim 2 , wherein the urea and hydrogen chloride are in a molar ratio of not less than 1.0:1.
4. The synthetic acid composition according to claim 1 , further including aminoalkylphosphonic salt.
5. The synthetic acid composition according to claim 4 , wherein the aminoalkylphosphonic salt is amino tris methylene phosphonic acid.
6. The synthetic acid composition according to claim 4 , wherein the aminoalkylphosphonic salt is present in a concentration ranging from 0.25 to 1.0% w/w.
7. The synthetic acid composition according to claim 6 , wherein the aminoalkylphosphonic salt is present in a concentration of 0.5% w/w.
8. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is cuprous iodide.
9. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is potassium iodide.
10. The synthetic acid composition according to claim 1 , wherein the metal iodide or iodate is sodium iodide.
11. The synthetic acid composition according to claim 1 , wherein the metal iodide is present in a concentration ranging from 100 to 1000 ppm.
12. The synthetic acid composition according to claim 1 , further comprising:
a phosphonic acid derivative.
13. The use of a synthetic acid composition in oil industry activities, said composition comprising:
urea and hydrogen chloride in a molar ratio of not less than 0.1:1;
a metal iodide or iodate; and
wherein the use comprises an activity selected from the group consisting of: stimulate formations; assist in reducing breakdown pressures during downhole pumping operations; treat wellbore filter cake post drilling operations; assist in freeing stuck pipe; descale pipelines and/or production wells; increase injectivity of injection wells; lower the pH of a fluid; remove undesirable scale on a surface selected from the group consisting of: equipment, wells and related equipment and facilities; fracture wells; complete matrix stimulations; conduct annular and bullhead squeezes & soaks; pickle tubing, pipe and/or coiled tubing; increase effective permeability of formations; reduce or remove wellbore damage; clean perforations; and solubilize limestone, dolomite, calcite and combinations thereof.
14. The synthetic acid composition according to claim 13 , further comprising:
a phosphonic acid derivative.