This paper presents the results of a study of sludge formation from the reaction of "real-world" hydrochloric acid with several crude oils. Dissolved ferric iron has previously been shown to be a major factor in the genesis of sludges in acidizing treatments. This work compares the sludge abatement capabilities of a novel iron reducing agent with those of several iron control agents in common use in the oilfield. Simple tests based on established API procedures are used. Results of field treatments using the new reducing agent are included.

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