Method for generating hydrofluoric acid in a subterranean...

Details Method for generating hydrofluoric acid in a subterranean... Method for generating hydrofluoric acid in a subterranean...

E - Fixed Constructions

21

B

166/25

E21B 43/27 (2006.01)

Patent

CA 1086637

ABSTRACT A method is disclosed for generating or forming hydrofluoric acid in a subterranean siliceous formation by combining an injected aqueous solution of a fluoride salt and an injected aqueous acid solu- tion in the pore spaces of the formation. This is accomplished according to this invention by immobilizing one of the aqueous solutions in the pore spaces of the formation by displacing the aqueous solution into the formation with a liquid that is substantially immiscible with the injected aqueous solution, thereby driving said aqueous solution to a saturation at or below its residual saturation. The other aqueous solution is then injected into the formation. -1-

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