Atteris compiled operating data (1995 – 2016), forecast production profiles (2016 – 2031) and fluid compositions, then simplified and “binned” this data enabling rapid flow assurance modelling of 21 years of operating data for numerous wells, piping elements and flowlines. Erosion in each element was then assessed in accordance with DNVGL-RP-O501.
Corrosion risks for all internal materials were assessed and remnant lives of components were estimated. Atteris then performed an external corrosion and cathodic protection assessment of the system – this included review of terabytes of video survey footage to establish a uniform judgement on the system’s anode depletions. Remnant lives for each anode and each major equipment item were estimated, enabling Woodside to extend the life of the system in conjunction with revised subsea maintenance planning.
