Patent EA-003312-B1 (EA)
Title: Compositions and fluids for matrix acidizing and method for treating a damaged formation
Inventor: CARD ROGER J
IPC: C09K8/86
Filed: 1999-11-30
Abstract: 1. A composition for treating matrix wherein comprising an ionic liquid. 2. The liquid for treating matrix wherein comprising the ionic liquid consisting of an organic cation and an inorganic anion, said organic cation selected from the group consisting of quaternary ammonium compounds, sulfonium derivatives, and phosphonium derivatives and wherein said anion is selected from the group consisting of BF4-, PF6-, SbF6-, CF3SO3-,CuCl2-, AlCl4-, RalCl3-, R2AlCl2-, CuCl2-, Cu2Cl3-, Cu3Cl4-, A22Cl7-, Al3Cl10-, NO3-, and (CF3SO2)2N-, Br-, ClO4-, CH3COO-, and BPh4-. 3. The liquid for treating matrix of claim 2 wherein said quaternary ammonium compounds are selected from the group consisting of imidazole derivatives, pyridinium derivatives, and tetraalkylammonium derivatives. 4. The liquid for treating matrix of claim 2 wherein said cation is selected from the group consisting of imidazole derivatives and pyridinium derivatives. 5. The liquid for treating matrix of claim 4 wherein said cation has the general formula: wherein R1, R2, R3, R4, and R5 are different and are selected from the group consisting of -CH3, -CH2CH3, -CH2CH2CH3 and -CH2CH2CH2CH3 and said anion is selected from the group consisting of AlCl4- , BF4-, and PF6-. 6. The liquid for treating matrix of claim 5 wherein said cation is 7. The liquid for treating matrix of claim 6 wherein said anion is selected from the group consisting of BF4- and PF6-. 8. The liquid for treating matrix of claim 6 wherein said anion is AlCl4-. 9. The liquid for treating matrix of claim 5 wherein said ionic liquid is a 1-N-alkyl-3-methylimidazolium tetrachloroaluminate. 10. The liquid for treating matrix of claim 5 wherein said ionic liquid is a 1-alkl-3-alkylimidazolium tetrachloroaluminate. 11. The liquid for treating matrix of claim 5 wherein said ionic liquid is 1-ethyl-3-methylimidazolium tetrachloroaluminate. 12. The liquid for treating matrix of claim 5 wherein said ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate. 13. The liquid for treating matrix of claim 5 wherein said ionic liquid is butylmethyl imidazolium hexafluorophosphate. 14. The liquid for treating matrix of claim 4 wherein said cation has the general formula: wherein R is selected from the group consisting of -CH2CH3, -CH2CH2CH3 and -CH2CH2CH2CH3 and said anion is selected from the group consisting of AlCl4- , BF4-, PF6-and NO3-. 15. The liquid for treating matrix of claim 14 wherein said cation is: 16. The liquid for treating matrix of claim 14 wherein said anion is selected from the group consisting of BF4- and PF6-. 17. The liquid for treating matrix of claim 14 wherein said anion is AlCl4-. 18. The liquid for treating matrix of claim 14 wherein said ionic liquid is an N-alkylpyridinium tetrachloroaluminate. 19. The liquid for treating matrix of claim 14 wherein said ionic liquid is 1-butylpyridinium nitrate. 20. The liquid for treating matrix of claim 14 wherein said ionic liquid is 1-butylpyridinium hexafluorophosphate. 21. The liquid for treating matrix of claim 14 wherein said ionic liquid is 1-butylpyridinium tetrachloroaluminate. 22. The liquid for treating matrix of claim 14 wherein said cation has the general formula: wherein R1, R2, R3, and R4 are selected from the group consisting of -CH2CH3, -CH2CH2CH3 and -CH2CH2CH2CH3 and said anion is selected from the group consisting of AlCl4- , BF4-, PF6-and NO3-. 23. The liquid for treating matrix of claim 4 wherein said cation has the general formula: wherein R1, R2, R3, and R4 together have not less than 20 carbon atoms, or R1, R2, R3, and R4 are different, and are selected from the group consisting of -CH2CH3, -CH2CH2CH3, -CH2CH2CH2CH3 and CH2CH2CH2CH2CH3 and said anion is 24. The liquid for treating matrix of claim 4 wherein said cation is butyl-pentyl-octyl-propylammonium. 25. The liquid for treating matrix of claim 4 further comprising a viscoelastic surfactant. 26. The liquid for treating matrix of claim 5 further comprising a viscoelastic surfactant. 27. The liquid for treating matrix of any claims 7, 12, 13, 16 and 20 wherein further comprising an acid. 28. The liquid for treating matrix of any claims 7, 12, 13, 16 and 20 wherein said acid is a super acid consisting essentially of HF and SbF5. 29. The liquid for treating matrix of any claims 9, 10 and 11 wherein further comprising HF. 30. The liquid for treating matrix of any claims 8-11, 17-19 and 21 wherein comprising water. 31. The liquid for treating matrix of claim 30 wherein comprising an aqueous solution. 32. A method for treating a damaged formation penetrated by a well comprising injecting a matrix treatment composition of any claims 1 to 26. 33. The method of claim 32 wherein the well under treatment is shut in for about 10 hours. 34. The method of claim 32 wherein the well under treatment is shut in for about 24 hours.