Evaluation of Successful Matrix Acidizing Method in A Geothermal Well with Comparative Sensitivity of Acid Fluid Models, Volume, and Concentration: A Case Study on Well “X”

Abstract

Abstract One of the challenges in producing a well is formation damage. Stimulation treatment is known can improve production by removing the formation damage. Matrix acidizing is the most known and proven effective for stimulation treatment. Three matrix acidizing models for sandstone are commonly used, i.e., Dowell, McLeod, and Kalfayan. Matrix acidizing study is conducted in geothermal sandstone formation well with quartz and silica dominated. Five acid fluid models will be injected to compare and evaluate the result of skin factor and productivity index during acidizing. Five types of acid will be used 12% HCl - 3% HF (Dowell model), 6% HCl – 1.5% HF (McLeod model), 10% HCl – 5% HF (Kalfayan model), 5% HF main acid, and using 9% HF main acid. This study uses well performance calculation and analysis to determine whether this well is a good candidate for acidizing. This study presents the sensitivity of the acid fluid model, volume and concentration injected to determine the optimum result of matrix acidizing design in this well. The result consists of the skin factor value after acidizing and the productivity index ratio before acidizing and after acidizing (FOI).