Method for acidizing a subterranean formation

Details Method for acidizing a subterranean formation Method for acidizing a subterranean formation

C - Chemistry, Metallurgy

09

K

31/33

C09K 8/72 (2006.01)

Patent

CA 1084252

ABSTRACT The permeability of a siliceous formation is increased by injecting in sequence, a fluoboric acid solu- tion followed by a mud acid (HCI/HF) solution. The method is particularly advantageous in formations which have a tendency to plug initially upon contact with mud acid, or with HCl commonly used as a preflush ahead of mud acid. When contacted initially with fluoboric acid, such formations show little or no plugging effects when subsequently treated with mud acid.

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