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Ningaloo Vision Mooring Analysis

Decommissioning

Ningaloo Vision Mooring Analysis

Benefits

Santos were able to confirm the optimal cut option for the reduced mooring system being considered for the VGCN Disconnectable Turret Mooring, ensuring the buoy is stable and remains above its maximum allowable depth.

Background

The Van Gogh, Coniston, and Novara (VGCN) fields are in the Exmouth Basin offshore Western Australia. The fields are tied back to the Ningaloo Vision Floating Production Storage and Offloading (FPSO) vessel via flexible flowlines/risers. Santos plan to decommission the FPSO and leave the DTM buoy in place for 1 year before removal. Atteris was engaged to perform an assessment of the buoy with three of its nine mooring lines removed.

Work Performed by Atteris

Atteris performed the following activities:

Determine the best cut locations for the mooring lines to optimise the maximum buoy floating depth and its stability,
Assess the impact of buoy internal compartment damage,
Perform numerous sensitivities to reduce the weight and floating depth of the buoy including: marine growth added weight based on latest inspection documents, ballast tank flooding and considering various return period environmental conditions.

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