CCS wells and other complex applications require deeper insights to achieve optimization and ensure well integrity and resilience. This session covers the novel application of flow control valves and distributed acoustic sensing (DAS) to understand injection flows in the wellbore and formation system. Additionally, new research will be presented on cement integrity and durability under challenging pressure, temperature, and fluid composition conditions. The session will also explore the integrity of multilateral well junctions through rigless intervention systems, which can extend the operating life of wells.