Enhancing Oil Recovery in Mature Fields: Retrofit Autonomous Inflow Control Device AICD Completions for Viscous Oil Horizontal Wells: A Case Study

Abstract This study explores the implementation and operational assessment of retrofit Autonomous Inflow Control Device (AICD) completions in a mature North American oilfield with a history of extensive primary production, water flooding, and steam flooding. The field now faces late-life water production challenges due to water coning and early breakthrough in horizontal wells. By retrofitting AICD completions within existing sand screen or liner completions, operators have effectively mitigated water production while accessing bypassed and attic oil. Optimized zonal isolation and well compartmentalization have resulted in enhanced oil recovery and extended well productivity. The adoption of retrofit AICD technology has introduced a strategic shift in production philosophy, favoring managed drawdown and balanced pressure profiles over high-rate fluid extraction. This approach reduces the risk of water coning, enhances AICD efficiency, and lowers operational costs associated with artificial lift and water disposal. Coupled with wellbore flow modeling, this method has demonstrated increased reserve recovery, accelerated project paybacks, and long-term economic sustainability. Furthermore, this case study provides insights into best practices for deployment, performance monitoring, and ongoing optimization of retrofit AICD installations. The use of retrofit AICD completions inside existing, non-compartmentalized, stand-alone screen or slotted liner completions is not a magic solution for controlling water breakthrough in all such wells. The successful application described in this paper benefited from a poorly consolidated formation and natural borehole collapse, without which the improvement observed would not be possible.