Investigating phase dynamics of reservoir fluids in CO2 huff-n-puff enhanced oil recovery

Abstract

This investigation delves into the dynamic phase behavior of reservoir fluids during CO2 huff-n-puff processes, a critical aspect of enhanced oil recovery. Utilizing numerical simulations, the study examines the formation and evolution of four key fluid phase zones, including a miscible-phase oil zone and two flanking miscible-phase condensate gas zones, shedding light on the intricate interactions between CO2 and reservoir fluids. The research methodically addresses the spatial and temporal dynamics of these zones, providing a framework for understanding their evolution. It delves into the complex interplay of fluid properties and phase states, revealing the fundamental role of component migration in influencing phase behavior. This exploration not only uncovers the mechanisms driving fluid dynamics in the CO2 huff-n-puff process but also emphasizes the broader implications for improving oil recovery strategies. By offering a comprehensive view of the factors governing phase behavior, the study contributes to the field's knowledge, suggesting avenues for future research and practical application in enhancing oil recovery efficiency.