Anti-sludge additives

Sludges are stable emulsions with high viscosity, and form when crude oils encounter strong mineral acids such as hydrochloric acids, specifically the Asphaltene components within crude oils. Acid induced sludges are a result of incorrect or lack of fluid compatibility testing before delivering an acidizing treatment, and when these sludges form downhole they can have a detrimental effect on production. The use of an anti-sludge agent in a matrix acidizing system will prevent these sludges from forming, while still allowing the acid to react with the reservoir rock. Anti-sludge agents are specific blends of surfactants, which alter the interfacial tension present between fluids.