H.sub.3 PO.sub.4 /HF Siliceous formation treating composition an

Details H.sub.3 PO.sub.4 /HF Siliceous formation treating composition an H.sub.3 PO.sub.4 /HF Siliceous formation treating composition an

1982-11-09

1985-12-31

Guynn, Herbert B.

Wells

Processes

Placing fluid into the formation

252 855C, E21B 4327

Patent

active

045615039

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 fluorine 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.RTM. solution, components of which serve to further potentiate calcium carbonate reactivity retardation.

REFERENCES:
patent: 2094479 (1937-09-01), Vandergrift
patent: 2652360 (1953-09-01), Bond et al.
patent: 2664398 (1953-12-01), Bond
patent: 3794117 (1974-02-01), Knox et al.
patent: 3953340 (1976-04-01), Templeton et al.
patent: 4304676 (1981-12-01), Hall
patent: 4332688 (1982-06-01), Tate

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