EA-250 emulsified acid is a viscous, highly retarded HCL system designed to overcome acid penetration problems while stimulating reservoirs above 75 degF. Standard hydrochloric acid reacts very quickly in carbonate formations. The reaction is so rapid in high temperatures that it is impossible for acid to penetrate, or wormhole, more than a few inches into the formation. In such cases, the acid is rendered ineffective in stimulation the well. The HT EAS acid retards the acid reaction rate, enabling deep, live-acid penetration. This oil-external emulsion is formed with a 70:30 HCL-to-Oil ratio, stabilized with an emulsifier. HCL concentrations ranging from 7.5 to 28% may be used in ether a batch or continuous mix system.