A Comparative Study of Traditional and Inline Tensioning Systems for Floating Oil Platform Anchoring

Resumo

In floating platforms dedicated to oil exploration, a crucial component for the efficient and safe operation of an anchoring system is traditionally a setup that includes winches, mooring fairleads, mooring locks, storage hold, and a power unit. While effective, these systems can occupy considerable space on the platform deck and add to operational complexity. Recently, significant innovations have emerged, such as the application of a tensioner system integrated into the anchoring line itself, which eliminates the need for the previously mentioned equipment. This advancement in anchoring technology directly impacts the overall performance of the anchoring and installation and influences the platform hull design.The operability and reliability of the design are intrinsically linked to the chosen anchoring system. Systems that occupy the deck consume space and present operational challenges, including unavailability throughout the platform's operational life. Additionally, the use and maintenance of these systems compete with other essential platform activities due to the limited number of people on board (POB), leading to increased operational complexity and costs.This article aims to analyze the forces involved in the application of the inline tensioner. Variations in the position of this tensioner will be utilized to assess the overall impact on the anchoring system. This analysis will compare currently used anchoring systems to evaluate whether there is an increase or reduction in the loads involved or, conversely, no significant changes.A fatigue analysis will also be conducted, comparing the lifespan of the current system with that of the proposed system, with a focus on the tensioner application points. This comparison seeks to identify potential improvements in durability and efficiency of the new system versus the existing one. Furthermore, the loads acting on the tensioner in various tested positions will be evaluated to confirm its viability in practical applications.To perform this analysis, a typical platform model designed for ultra-deepwater exploration in the pre-salt region will be employed, utilizing Situa/Prosim software. Evaluating this new equipment could enable a system with significant economic advantages and promote substantial advancements in the efficiency of anchoring systems for floating platforms dedicated to oil exploration.