Compositions and method for controlling precipitation when acidi

Wells – Processes – Placing fluid into the formation

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166271, 166312, 252 8553, E21B 3700, E21B 4327

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active

049497901

ABSTRACT:
A precipitation control additive composition, an acidizing composition for treating a sour well and a method of treating a sour well are provided. An iron sequestering agent and a sulfide modifier are added to a treating solution. The iron sequestering agent combines with iron present in the solution while the sulfide modifier combines with sulfides present in the solution. By combining with both iron and sulfides present in the solution, the combination of an iron sequestering agent and a sulfide modifier effectively inhibits precipitation of ferric hydroxide, ferrous sulfide and free sulfur from the solution. As a result, formation and other serious damage is prevented.

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