Method for acidizing subterranean formations

Details Method for acidizing subterranean formations Method for acidizing subterranean formations

1975-12-24

1978-01-17

Novosad, Stephen J.

Wells

Processes

Specific low fluid loss feature for fluid attacking formation

166302, 166307, 166308, 252 855C, E21B 4326, E21B 4327

Patent

active

040687201

ABSTRACT:
Gelled acidic compositions suitable for either matrix acidizing or fracture-acidizing of subterranean formations, and methods of using said compositions in acidizing operations, are provided. Said compositions comprise water, a water-soluble cellulose ether, an acid, a water soluble compound of a polyvalent metal wherein the metal can be reduced to a lower polyvalent valence state and cause gelation of the water containing said cellulose ether and said acid, and a reducing agent capable of reducing said metal and causing said gelation.

REFERENCES:
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patent: 2891619 (1959-06-01), Sneary
patent: 3294729 (1966-12-01), Hort et al.
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patent: 3506581 (1970-04-01), Kucera
patent: 3727688 (1973-04-01), Clampitt
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patent: 3760881 (1973-09-01), Kiel
patent: 3845822 (1974-11-01), Clampitt
patent: 3881552 (1975-05-01), Hessert
patent: 3923666 (1975-12-01), Dill
Harris et al., High-Concentration Hydrochloric Acid Aids Stimulation Results in Carbonate Formations, Journal of Petroleum Technology, Oct., 1966, pp. 1291-1296.

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