Method for generating hydrofluoric acid in a subterranean format

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

1977-08-19

1979-01-30

Novosad, Stephen J.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166307, E21B 4327

Patent

active

041367391

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 solution 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.

REFERENCES:
patent: 1990969 (1935-02-01), Wilson
patent: 2038720 (1936-04-01), Groote
patent: 2872982 (1959-02-01), Wade
patent: 3481404 (1969-12-01), Gidley
patent: 3679000 (1972-07-01), Kaufman
patent: 3889753 (1975-07-01), Richardson
patent: 3931089 (1976-01-01), Karl
patent: 4056146 (1977-11-01), Hall

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