Claims
- 1. An acidizing composition comprising:
a strong mineral acid solution; an electron donor agent; a primary electron transfer agent, said primary electron transfer agent being a source of rhenium ions; and a secondary electron transfer agent, said secondary electron transfer agent being selected from the group consisting of a source of iodide ion and a source of iodine, whereby said electron donor agent and said primary and secondary transfer agents function together to reduce ferric ion present in said mineral acid solution to ferrous ion.
- 2. The composition of claim 1 wherein said strong mineral acid solution is an aqueous acid solution including at least about 25% by weight, based on the total weight of the solution, hydrochloric acid.
- 3. The composition of claim 2 wherein said aqueous acid solution includes hydrochloric acid in an amount in the range of from about 25% to about 35% by weight, based on the total weight of the acid solution.
- 4. The composition of claim 3 wherein said aqueous acid solution includes hydrochloric acid in an amount of approximately 28% by weight, based on the total weight of the acid solution.
- 5. The composition of claim 1 wherein said electron donor agent is selected from the group consisting of a thiol compound having a carbon chain that includes an oxygen or oxygen containing functional group, hypophosphorous acid, and a hypophosphorous acid precursor.
- 6. The composition of claim 5 wherein said electron donor agent is a thiol compound having a carbon chain that includes an oxygen or oxygen containing functional group, said thiol compound being selected from the group consisting of compounds of the formula HSCH2C(O)R1 and compounds of the formula HSCH2C(OH)R3R4 wherein:
R1 is either OH, OM or R2; M is a corresponding cation of the carboxylate anion of the thiol; R2 is an organic radical having from 1 to 6 carbon atoms; R3 is either H or an organic radical having from 1 to 6 carbon atoms; and R4 is either H or an organic radical having from 1 to 6 carbon atoms.
- 7. The composition of claim 6 wherein said thiol compound is selected from the group consisting of thioglycolic acid, thioglycolic acid precursors, β-hydroxymercaptans, thiomalic acid and thiolactic acid.
- 8. The composition of claim 7 wherein said electron donor agent is thioglycolic acid.
- 9. The composition of claim 5 wherein said electron donor agent is selected from the group consisting of hypophosphorous acid and hypophosphorous acid precursors.
- 10. The composition of claim 9 wherein said electron donor agent is selected from the group consisting of hypophosphorous acid, sodium phosphinate, calcium phosphinate, ammonium phosphinate and potassium phosphinate.
- 11. The composition of claim 1 wherein said electron donor agent is present in said composition in an amount in the range of from about 0.01% to about 10% by volume based on the volume of said mineral acid solution.
- 12. The composition of claim 1 wherein said primary electron transfer agent is selected from the group consisting of perrhenic acid and rhenium salts.
- 13. The composition of claim 1 wherein said primary electron transfer agent is perrhenic acid.
- 14. The composition of claim 1 wherein said primary electron transfer agent is present in said composition in an amount in the range of from about 0.1 pounds to about 5 pounds per 1000 gallons of said mineral acid solution.
- 15. The composition of claim 1 wherein said primary electron transfer agent is present in said composition in an amount of about 1 pound per 1000 gallons of said mineral acid solution.
- 16. The composition of claim 1 wherein said secondary electron transfer agent is selected from the group consisting of potassium iodide, sodium iodide and iodine.
- 17. The composition of claim 16 wherein said secondary electron transfer agent is present in said composition in an amount in the range of from about 10 to about 80 pounds per 1000 gallons of said mineral acid solution.
- 18. The composition of claim 17 wherein said secondary electron transfer agent is present in said composition in an amount in the range of from about 15 to about 30 pounds per 1000 gallons of said mineral acid solution.
- 19. The composition of claim 1 wherein said strong mineral acid solution is an aqueous acid solution including at least about 25% by weight, based on the total weight of the solution, hydrochloric acid, said electron donor agent is thioglycolic acid, said primary electron transfer agent is perrhenic acid and said secondary electron transfer agent is potassium iodide.
- 20. The composition of claim 1 wherein said strong mineral acid solution is an aqueous acid solution including at least about 25% by weight, based on the total weight of the solution, hydrochloric acid, said electron donor agent is thioglycolic acid, said primary electron transfer agent is perrhenic acid and said secondary electron transfer agent is potassium iodide.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This is a divisional of application Ser. No. 09/801,528 filed on Mar. 8, 2001, now pending.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09801528 |
Mar 2001 |
US |
Child |
10138358 |
May 2002 |
US |