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Abstract Successful reservoir management relies heavily on timely interventions and accurate data acquisition, which together drive informed decision-making and optimize production strategies. Dual-purpose multilateral technology supports this aim by integrating observation and production functions within a single wellbore, allowing continuous reservoir monitoring and prompt interventions. This design incorporates lateral re-entry windows that grant access to each drilled lateral, while interventions remain vital for acquiring critical wellbore and reservoir parameters. A seamless completion design is fundamental to ensuring that interventions are both efficient and reliable. Utilizing lateral access windows significantly enhances operational efficiency and effectiveness through well-engineered completions, which are crucial for successful field operations. Multilateral wells are carefully designed to facilitate smooth and dependable interventions. Equipped with permanent downhole gauges, these wells offer continuous pressure and temperature monitoring, enabling proactive reservoir management. The installed equipment, along with supplementary accessories, boosts system reliability and provides contingency options to address accessory failures. This meticulous, experience-driven design approach has proven indispensable in maintaining system integrity and operational continuity. Ensuring smooth intervention operations is vital to minimizing risks and sustaining long-term production. Periodic logging in the vertical observation lateral is necessary for reservoir surveillance, including saturation and production logging. The lateral access window technology effectively supports interventions in both the main bore and laterals, a capability validated by recent successful field applications. These interventions have facilitated well logging and treatment operations in both vertical and horizontal laterals, highlighting the technology's operational robustness. To maximize operational efficiency, slickline was deployed to access the horizontal lateral, enabling retrieval of an isolation sleeve and installation of a tubing exit whipstock (TEW) for lateral re-entry. Following this, coiled tubing or wireline with tractor systems were used through the window to conduct intervention tasks such as production logging and well revitalization. Upon completion, the TEW was retrieved, the isolation sleeve reinstalled, and production resumed without interruption. This dual-purpose multilateral completion technology represents a proven design that simplifies and improves access to both vertical and horizontal laterals without the need for rig mobilization or complex retrieval procedures. A substantial track record in well interventions and reservoir management supports the reliability and effectiveness of this approach. The technology's real-time monitoring capabilities deliver accurate, actionable data to support well monitoring and reservoir management while enabling efficient and effective interventions.