Abstract
A review of two separate FPSO (Floating, Producing, Storage and Offloading) vessels water injection systems was carried out with emphasis on the impact of the uptime of the system on overall production from the fields. The focus remained on the critical aspects of the WI injection system and what constitute a top quartile performing system. Results highlights the correlation between the injection water volumes/frequency on the reservoir pressures, voidage and production in both fields with marked adverse impact as defects on key units of the water injection systems increased. On FPSO1, a poor overall uptime of the WI system over a 6 year period showed a significant reduction in the life of the fields. For FPSO2, a contrasting illustration in results showed that an improved water injection uptime arrested a decline with improved reservoir pressures and production with the desired overall impact of increasing the overall recovery and extension of the life of the fields. Ongoing improvement studies shows that an increase in the water injection system uptime up to an average of around 80% will potentially improve production by close to 3 mln bbls of oil, securing an additional 6–7 mln bbls over the life of one of the fields under review as it extends production for another 5 years.
