Perpustakaan Digital ITB

This study presents a comprehensive feasibility analysis of CO? injection well development for a carbon capture and storage (CCS) project located in a mature offshore oilfield in Southeast Sumatra, Indonesia. Two alternative approaches are evaluated: converting an existing production well (CTI) and constructing a new injection well. The study assesses well design, integrity, material and cement selection, as well as completion strategy. Software simulations are utilized to design and analyze well performance under CO? exposure. Results indicate that while the CTI approach may offer reduced initial capital expenditure, it introduces significant well integrity risks due to incompatible materials and legacy design constraints. An alternative well design is also proposed, incorporating mixed-grade casing string and advanced CO?-resistant materials to improve both injectivity and safety. Economic analysis shows that the alternative new well design provides better cost efficiency and long-term integrity assurance compared to both the planned new well and the CTI approach. The study concludes that when longterm integrity is a critical factor, constructing a new well is the more robust and sustainable option