2022 FSO2 Riser Hoses Replacement Project (Bongkot Asset)

Abstract

Two Riser hoses attached with FSO2 (Floating, Storage & Offloading) has estimated service life (9.3 years). The next replacement is required before July 2022. Thus, in June 2022 Project team had planned to disconnect and reinstall two newly riser hoses with approach to comingle production stream enable to continue production without any shutdown. The overall execution plan has learnt best practices from previous operation since 2013. For 15 days offshore execution, collaboration between Project team, Operation & Maintenance, Marine team and specialized contractor is essential. The offshore execution began with preparation steps which include tank offloading, heading control system, pre-installation visual survey, before comingling to operate one riser hose and flushing another. Then, the 5 days operation per hose to disconnect, replace the newly hose. After leak test and hydrotesting all connections was performed, Production team will switch the production via this new hose and repeat similar replacement steps with another hose. On technical aspects, the riser hose replacement may consider not a complicated task. Although advance preparation prior commencing offshore installation in conjunction with experiences contractor are critical and important. Collaboration with various stakeholders requires full attention to address those concerned areas with mitigation and measures especially on HSE aspects resulted from risk assessment and several workshops. Strategic approach to perform the riser hoses replacement without interrupting the production is a challenge. Applying comingle strategy requires effort to breakdown related activities and sequential analysis to ensure all the execution will be smooth without jeopardizing the HSE issues. Also, during the contractor selection stage Project team had selected national qualified contractor. It turns out that national contractor also has similar capability to manage and deliver this scale of project with very acceptable quality but competitive price. Even this is not PTTEP first riser hoses replacement project though the Project team would like to remark great achievement which could only arise from effective teamwork, good collaboration among all relevant stakeholders and benchmarked best practices from our expertise and learned from previous experiences. In addition, it is worth to mention that the offshore execution was performed safely without interrupting the environment and the ongoing production.