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Aqueous liquid compositions for increasing the permeability of a subterranean formation are disclosed, the compositions being characterized by provision of fluoborate anion (fluoboric acid) and a specified compound or compounds, or mixture thereof, which chelate aluminum ions and aluminum fluoride s

Aqueous liquid compositions for increasing the permeability of a subterranean formation are disclosed, the compositions being characterized by provision of fluoborate anion (fluoboric acid) and a specified compound or compounds, or mixture thereof, which chelate aluminum ions and aluminum fluoride species. Methods of treating a subterranean formation by injection of the composition(s) into the formation are also described.

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1. A composition for treating a subterranean formation consisting essentially of an aqueous acidic mixture formed by blending an aqueous liquid; an amount of fluoboric acid sufficient to increase the permeability of the formation; and an effective amount of an acid, or mixture of acids, comprising a

1. A composition for treating a subterranean formation consisting essentially of an aqueous acidic mixture formed by blending an aqueous liquid; an amount of fluoboric acid sufficient to increase the permeability of the formation; and an effective amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof. 2. The composition of claim 1 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 3. The composition of claim 2 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 4. The composition of claim l in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 5. The composition of claim 1 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 6. A composition for treating a subterranean formation consisting essentially of an aqueous acidic mixture formed by blending an aqueous liquid; amounts of a fluoride ion source and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation; and an effective amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof. 7. The composition of claim 6 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 8. The composition of claim 7 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 9. The composition of claim 6 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 10. The composition of claim 6 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 11. The composition of claim 6 in which the pH is 2 or below. 12. A composition for treating a subterranean formation consisting essentially of an aqueous mixture formed by blending an aqueous liquid, amounts of HCl, a fluoride ion source, and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation, and an effective amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salt of such acids, or a mixture thereof. 13. The composition of claim 12 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 14. The composition of claim 13 in wh ich the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 15. The composition of claim 12 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 16. The composition of claim 12 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 17. The composition of claim 12 in which the pH is 2 or below. 18. A composition for treating a subterranean formation consisting essentially of an aqueous acidic mixture formed by blending an aqueous liquid, and amounts of HF and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation, and an effective amount of a compound or compounds, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species. 19. The composition of claim 18 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 20. The composition of claim 19 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 21. The composition of claim 18 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 22. The composition of claim 18 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 23. The composition of claim 18 in which the pH is 2 or below. 24. A method of treating a subterranean formation to increase permeability comprising injecting into the formation an effective amount of an aqueous acidic mixture formed by blending an aqueous liquid, an amount of fluoboric acid sufficient to increase the permeability of the formation, and an amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof, effective to increase the dissolution of clay. 25. The method of claim 24 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 26. The method of claim 25 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 27. The method of claim 24 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 28. The method of claim 24 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 29. The method of claim 24 in which the pH is 2 or below. 30. A method of treating a subterranean formation to increase permeability comprising injecting into the formation an effective amount of an aqueous acidic mixture formed by blending an aqueous liquid, and amounts of a fluoride ion sour ce and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation, and an amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof, effective to increase the dissolution of clay. 31. The method of claim 30 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 32. The method of claim 31 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 33. The method of claim 30 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 34. The method of claim 30 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 35. The method of claim 30 in which the pH is 2 or below. 36. A method of treating a subterranean formation to increase permeability comprising injecting into the formation an effective amount of an aqueous acidic mixture formed by blending an aqueous liquid, amounts of HCl, a fluoride ion source, and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation, and an amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salt of such acids, or a mixture thereof, effective to increase the dissolution of clay. 37. The method of claim 36 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 38. The method of claim 37 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 39. The method of claim 36 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 40. The method of claim 36 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 41. The method of claim 36 in which the pH is 2 or below. 42. A method of treating a subterranean formation to increase permeability comprising injecting into the formation an effective amount of an aqueous acidic mixture formed by blending an aqueous liquid, and amounts of HF and a boron source sufficient to provide a concentration of BF 4 − anion effective to increase the permeability of the formation, and an amount of a compound or compounds comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, effective to increase the dissolution of clay. 43. The method of claim 42 in which the mixture of acids, which chelate aluminum ions and aluminum fluoride species, comprises a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, and an acid, or mixture of acids, selected from polycarboxylic acids, polyaminopolycarboxylic acids, and mixtures thereof. 44. The method of claim 43 in which the monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species is selected from nitrilotriacetic acid, 2-hydroxyethyliminodiacetic acid, and mixtures thereof. 45. The method of claim 42 in which the aqueous mixture comprises from 1 to 20 percent BF 4 − anion. 46. The method of claim 42 in which non-interfering ionic species are present in an amount effective to provide an ionic strength for the aqueous mixture sufficient to inhibit migration of clay particles. 47. The method of claim 42 in which the pH is 2 or below. 48. A composition for treating a proppant pack in a fracture in a subterranean formation comprising an aqueous acidic mixture formed by blending an aqueous liquid; an amount of fluoboric acid sufficient to increase the permeability of the proppant pack; and an amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof, effective to increase the dissolution of clay. 49. A method of treating a proppant pack in a fracture in a subterranean formation to increase permeability of the proppant pack comprising injecting into the proppant pack an effective amount of an aqueous acidic mixture formed by blending an aqueous liquid, an amount of fluoboric acid sufficient to increase the permeability of the proppant pack, and an effective amount of an acid, or mixture of acids, comprising a monoaminopolycarboxylic acid, or mixture of monoaminopolycarboxylic acids, which chelate aluminum ions and aluminum fluoride species, or an ammonium or potassium salt or salts of such acids, or a mixture thereof.