Perpustakaan Digital ITB

Flow assurance is a critical consideration in the design and operation of CO? injection wells, particularly within Carbon Capture and Storage (CCS) applications where CO? is often injected under supercritical conditions. This study evaluates the influence of flow restrictions, specifically Subsurface Safety Valves (SSSV), on fluid behavior in injection well tubing. A dynamic transient simulator was used to model two injection wells, INJ 3A and INJ 4A, across various scenarios involving different SSSV valve openings and tubing inner diameters. Key operational parameters such as pressure and temperature profiles, fluid phase transitions, flow regime stability, gas rate behavior, hydrate formation risk, and potential for erosion and corrosion were assessed comprehensively. The simulation results indicate that smaller valve openings significantly reduce injection rates and increase pressure drop, leading to a transition of CO? from supercritical to gaseous phase, greater hydrate formation potential, and more frequent occurrence of unstable slug flow. Although reduced valve openings contribute to lower erosional velocity and corrosion rate, they may also prevent the system from meeting minimum injection requirements for effective reservoir performance. These findings emphasize the importance of optimizing flow control elements to ensure injection stability and long-term integrity in CCS operations.