Perpustakaan Digital ITB

Low matrix permeability and formation damage near the wellbore frequently result in suboptimal well performance in carbonate reservoirs. Acid stimulation techniques, including matrix acidizing and acid fracturing, are commonly implemented to optimize productivity. However, empirical guidelines are typically employed to select between these methodologies rather than quantitative criteria. This study applies a systematic decisionmaking framework to determine the optimal acid stimulation technique for Well X in a carbonate reservoir. The methodology compares the performance of matrix acidizing and acid fracturing using productivity index ratio (RPI,v) calculations and the carbonate acid stimulation number (NCAS). Well X is a vertical gas well located at a depth of 9,637 ft with a net pay of 473 ft across two perforated intervals, moderate porosity (13%), and low permeability (2.35 mD). The analysis evaluates two treatment scenarios: matrix acidizing and acid fracturing. Results indicate that Well X is an excellent candidate for acid stimulation, as the reservoir characteristics fall significantly below the permeability cutoff of 88.3 mD. The productivity index ratio of 2.49 suggests that acid fracturing would result in a 249% increase in productivity compared to matrix acidizing. Economic analysis demonstrates that acid fracturing generates superior absolute returns, with a net present value (NPV) of $43,959 kUSD. This study establishes a quantitative framework that optimizes both technical performance and economic outcomes of carbonate reservoir stimulation by replacing empirical decision-making with systematic analysis.