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Rimau asset produces oil and gas from Limestone reservoir and Sandstone reservoir. Acidizing job for mature field hold essential job for maintaining decline rate and optimization. Common acid system in Rimau Asset is HCl 15%. Acidizing on those different reservoir types, have own acid recipe designed for each reservoir uniqueness challenges. Likewise face dissolution problem, corrosion and iron precipitation, second reaction precipitation, and limited mineralogy reservoir data. Production engineer need to handle these challenges effectively. Option to overcome those challenges is Chelating Acidizing system. Those challenging problems as mentioned before, will have no issue by Chelating Acidizing System and works either at Sandstone or Limestone without further additional cautions. Chelating acidizing at matrix stimulation was first investigated in 1997 by Fredd and Fogler. Chelating as new acid system project is implemented in Medco based on literature and best practice paper study, laboratory test, and real field implementation. Engineering study combine all of those methodology to ensure the successful result of this project. Total volume needed for matrix acidizing is measured by skin thickness. For rules of thumb, engineering judgement used 3 to 5 ft matrix acidizing penetration design. After matrix acidizing, left residual Chelating Acid to soak the well for 24 to 48 hours or more. After soaking period, start to produce and monitor the well. Result of Chelating Matrix Acidizing in Rimau, shows production increased. Chelating acidizing is non-hazardous chemical which easy to apply and get in the marketplace, and able to have long contact time in the metal wellbore. Chelating acidizing will give a solution for any field that has limited mineralogy data. Chelating acidizing works either at limestone formation or sandstone formation.