Method for acidizing siliceous formations

Details Method for acidizing siliceous formations Method for acidizing siliceous formations

E - Fixed Constructions

21

B

31/33

E21B 43/27 (2006.01) C09K 8/72 (2006.01)

Patent

CA 1263912

ABSTRACT A method for improving the permeability in a subterranean formation by acid treatment is disclosed. In this method, an aqueous acidizing solution containing hydrofluoric acid and excess fluoride is injected into the formation. The acidizing solution dissolves siliceous materials and reduces precipitation of dissolved species from the spent acidizing solution. Further, the acidizing solution has lower acidity than presently employed acidizing solutions and thus a reduced tendency to corrode wellbore tubing and equipment.

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