A Multicriteria Decision-Making (MCDA) Method for Decommissioning Offshore Oil and Gas Units in Brazilian Shallow Waters

Resumo

The decommissioning of offshore oil and gas facilities is a critical final stage in the lifecycle of the energy industry. As numerous infrastructures age and production fields mature, Brazil faces a significant increase in decommissioning obligations, particularly in its shallow water regions. Decision-making in this process is notoriously complex, involving a delicate balance of substantial costs, operational risks, environmental impacts, social considerations, and an evolving regulatory framework. This paper proposes a robust methodology to support decision-making in the decommissioning of offshore oil and gas production units in Brazilian shallow waters, aiming to optimize outcomes from a multifaceted perspective. A comprehensive literature review is conducted on international best practices, the Brazilian regulatory scenario, and the inherent challenges of shallow water decommissioning. Multi-Criteria Decision-Making (MCDA) models are explored, with a focus on methods like the Analytic Hierarchy Process (AHP) and compromise ranking solutions such as VIKOR, alongside specialized risk assessment tools like the Hierarchical Analyst Domino Evaluation System (HADES). The proposed methodology integrates technical, economic, environmental, safety, and social criteria into a structured framework designed for managers and regulators. This research is expected to contribute to enhancing the efficiency and sustainability of decommissioning operations in Brazil, minimizing adverse impacts and maximizing stakeholder benefits.