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Browse to Burrup Dropped Object Monte Carlo

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Browse to Burrup Dropped Object Monte Carlo

Benefits

Atteris performed a dropped object assessment in accordance with DNV-RP-F107 principles, albeit modified to incorporate a Monte Carlo approach. This approach resulted in a much lower risk of rupture compared to the standard DNV-RP-F107 drop ring approach and it enabled specific alterations to the subsea architecture layout to reduce dropped object risk.

Background

The Browse Development is a greenfield development incorporating the Brecknock, Calliance and Torosa offshore gas-condensate fields located in water depths of 400m to 700m. Woodside is currently assessing a Browse to Burrup (B2B) development that exports produced gas via an offshore pipeline to an existing onshore LNG processing facility at the Burrup Peninsula.

Due to both safety concerns for future drilling operations and environmental concerns due proximity to Scott Reef Woodside required a high level of dropped object risk definition for future drilling operations so that the subsea architecture could be optimised to reduce dropped object risk.

From the figure to the right it can be seen that there would be many configurations in which the standard DNV drop ring approach would register an impact when in reality the object has missed the subsea hardware.

Work Performed by Atteris

Atteris’ advanced analysis team performed a dropped object assessment in accordance with DNV-RP-F107 principles, albeit modified to incorporate a Monte Carlo approach to account for the object’s particular location and orientation at the moment it reaches the seabed.

This approach resulted in a much lower risk of rupture compared to the standard DNV-RP-F107 drop ring approach and it enabled specific alterations to the subsea architecture layout to reduce dropped object risk.

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