Perpustakaan Digital ITB

Reservoir pressure in a depleted-reservoir CO2 injection system changes during injection, altering the pressure, thermal, and facility requirements of the injection scheme. This study develops an integrated steady-state model as an early screening tool to determine whether a conceptual dual-fluid in-situ CO2 microbubble injection scheme remains operable as reservoir pressure changes, whether surface-facility settings remain adequate, and whether the selected injection-rate and wellhead-pressure settings remain appropriate. CO2 flows through vacuum-insulated tubing and surfactant-polymer solution through the annulus before both streams interact at a porous bottomhole membrane. The model couples surface facilities, dual-flow wellbore transport, membrane pressure requirements, rate-specific dispersion properties, and radial-Darcy reservoir injectivity. IPR-VLP analysis, parameter sensitivity, numerical verification, and independent submodel assessments are used to identify passing and failing conditions and their controlling criteria. The model is intended for conceptual screening and requires field-specific and vendor-qualified data before implementation.