Wells – Processes – Heating – cooling or insulating
Patent
1980-04-16
1984-01-31
Guynn, Herbert B.
Wells
Processes
Heating, cooling or insulating
166307, 252 855C, E21B 4327
Patent
active
044284322
ABSTRACT:
Wells of subterranean siliceous formations containing hydrocarbons are stimulated by the injection of crosslinked acid polymers wherein the polymer is a polysaccharide selected from the group consisting of carboxymethyl hydroxypropyl guar and carboxymethyl hydroxyethyl cellulose. The crosslinked acid polymer is a gel formed from a hydrated polysaccharide sol containing from about 1 to about 15 weight percent hydrochloric acid and from about 0.2 to about 6 weight percent hydrofluoric acid to which a water hydrolyzable polyvalent metal salt is added to cause the crosslinking. The metal salt is zirconium, titanium or hafnium. Additionally, an adjunct salt can be added in an amount of from about 5 to about 50 pounds per 1,000 gallons acid prior to the addition of the hydrolyzable polyvalent metal salt.
The crosslinked acid polymer retards the chemical reactivity of the acid mixture of hydrochloric and hydrofluoric acid, thereby allowing the acid mixture to penetrate deeper into the formation before the activity of the acids are spent. After its injection, the crosslinked acid polymer breaks down as a result of time and temperature of the reservoir into a less viscous fluid allowing the acids to react with the formation.
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Guynn Herbert B.
Smith International, Incorporated
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