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Understanding the multiphase transport behavior in production wells is critical for the safety and efficiency of Carbon Capture, Utilization, and Storage (CCUS) systems. In this study, a wellbore numerical model was established using computational fluid dynamics (CFD), incorporating the CO 2 -induced variations in produced-fluid properties. Based on the simulation results, a novel flow-pattern identification method tailored for CO 2 Enhanced Oil Recovery (CO 2 -EOR) production wells was proposed. In addition, by integrating this identification method with an interphase mass-transfer model for the wellbore, a dedicated pressure-drop prediction model for CO 2 -EOR production wells was developed. Finally, numerical simulations were conducted to investigate how key factors, including CO 2 content, water cut, and gas–liquid ratio, govern flow pattern transitions and pressure-gradient evolution, thereby identifying the major controlling factors of multiphase flow in CO 2 -EOR production wellbores. The findings provide a theoretical basis for optimizing flow assurance strategies in complex subsurface carbon storage and utilization projects.
Zhang et al. (Tue,) studied this question.