Wells – Processes – Placing fluid into the formation
Patent
1981-12-17
1986-08-12
Suchfield, George A.
Wells
Processes
Placing fluid into the formation
166308, 252 8551, 252 8553, E21B 4326, E21B 4327
Patent
active
046050680
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
Suchfield George A.
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