E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/28, 166/29
E21B 43/119 (2006.01) C09K 8/54 (2006.01) C09K 8/74 (2006.01) E21B 43/114 (2006.01)
Patent
CA 1099088
ABSTRACT OF THE DISCLOSURE 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.
325951
Romocki Julian M.e.
Young Peter J.
Macrae & Co.
Turbo Resources Limited
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