Perpustakaan Digital ITB

Indonesia’s oil production continues to decline, largely due to the dominance of mature reservoirs with reduced productivity. Field K, a light oil sandstone formation with favorable reservoir characteristics, offers strong potential for Enhanced Oil Recovery (EOR) implementation. This study evaluates and selects the most suitable EOR method for Field K through an integrated approach that combines technical screening, production forecasting, economic analysis, and risk assessment. EOR methods were initially screened using updated references through the Perta EOR platform. Selected candidates were further analyzed using a predictive model to simulate reservoir performance across various injection strategies. Economic viability was assessed through deterministic and probabilistic models, incorporating Monte Carlo simulations to account for uncertainty. A decision analysis framework was developed to support the final selection. Among the evaluated scenarios, ASP (Alkaline-Surfactant-Polymer) injection with 0.3 pore volume surfactant and 0.6 pore volume polymer emerged as the most promising, achieving a Net Present Value of USD 6.55 million under realistic cost and production assumptions. Sensitivity analysis identified oil production, oil price, and well cost as the most influential factors on economic outcomes. The decision tree analysis confirmed the robustness of the selected strategy across a range of uncertainties. This work demonstrates a comprehensive and integrated approach for early-stage EOR planning, enabling technically sound and economically optimized decision-making for mature reservoirs.