Method for acidizing a subterranean formation

Details Method for acidizing a subterranean formation Method for acidizing a subterranean formation

1977-08-15

1979-05-01

Novosad, Stephen J.

Wells

Processes

Placing fluid into the formation

E21B 4327

Patent

active

041518780

ABSTRACT:
The permeability of a siliceous formation is increased by injecting in sequence, a fluoboric acid solution followed by a mud acid (HCl/HF) solution. The method is particularly advantageous in formations which have a tendency to plug initially upon contact with mud acid, or with HCl commonly used as a preflush ahead of mud acid. When contacted initially with fluoboric acid, such formations show little or no plugging effects when subsequently treated with mud acid.

REFERENCES:
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patent: 2300393 (1942-11-01), Ayers
patent: 2367350 (1945-01-01), Heigl
patent: 2425415 (1947-08-01), Bond et al.
patent: 2663689 (1953-12-01), Kingston et al.
patent: 2679294 (1954-05-01), Bond et al.
patent: 2885004 (1959-05-01), Perry et al.
patent: 3283816 (1966-11-01), Bradley et al.
patent: 3543856 (1970-12-01), Knox et al.

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