H.sub.3po.sub.4/hf siliceous formation treating composition...

E - Fixed Constructions – 21 – B

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

Patent

CA 1183678

ABSTRACT A composition for treatment of siliceous formations, comprising an aqueous solution having a phosphoric acid concentration in the range of from about 10 to about 30% by weight, to which is added at least one flourine donor compound in an amount to provide a generated hydrofluoric acid concentration in the range of from about 1 to about 7% by weight. The composition is quite reactive towards clay and silica but, unlike conventional mud acid, displays significantly retarded reactivity towards calcium carbonate. The preferred fluorine donor is ammonium bifluoride, and an especially effective phosphoric acid solution is a Turflo? solution, components of which serve to further potentiate calcium carbonate reactivity retardation.

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