Compositions – Leather or fur treating
Patent
1983-04-21
1986-07-08
Guynn, Herbert B.
Compositions
Leather or fur treating
166307, E21B 4327
Patent
active
045991820
ABSTRACT:
There is disclosed a method of treating a subterranean substantially carbonate-free sandstone formation associated with a well completed in said substantially carbonate-free sandstone formation comprising displacing into said formation through said well an effective amount of an acidic aqueous solution comprising from about 5 to about 36 weight % phosphoric acid, from about 0.6 to about 5 weight % of a highly polar surface active agent which is a citric acid-monoethanolamine elimination reaction product, and an effective amount of a ferrous metal corrosion inhibitor. For treating a subterranean limestone or dolomitic formation or a sandstone formation having a substantial carbonate content there is additionally included in the acidic aqueous solution an amount of a phosphate crystal modifying agent sufficient to control crystal growth, minimize crystal agglomeration and minimize crystal adhesion to the formation. The acidic aqueous solutions exhibit clay shrinking and/or stabilizing properties and a lengthy spending time relative to that of conventional hydrochloric acid-based acidizing compositions.
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Romocki Julian M. E.
Young Peter J.
Amerigo Technology Limited
Guynn Herbert B.
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