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CWLH Life Extension Erosion and Corrosion Assessments

CWLH Life Extension Erosion and Corrosion Assessments

Benefits
Atteris extracted large amounts of operating data and compiled fragmented design data (more than 20 years old) in order to assess erosion and corrosion status of the CWLH subsea system. Through its combination of personnel embedded in client’s offices and home-office personnel Atteris demonstrated the ongoing health of the subsea system with minimal demands upon the time of Woodside personnel for a project which might normally require hundreds of client’s man-hours in data acquisition and transfer.
Background
The Cossack-Wanaea-Lambert-Hermes (CWLH) fields, operated by Woodside Energy Limited (WEL) are located approximately 135 km north-west of Karratha, off the North-West coast of Western Australia. Much of the original subsea equipment in the field was installed in 1994 with a 25 year design life (extending to 2019). Asset Life Extension (ALE) activities include internal erosion and corrosion assessments as well as external corrosion and cathodic protection assessments.
Work Performed by Atteris

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.

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