1. 1 COMPACT SUBSEA SEPARATOR MODULES OF OIL-WATER By Rotimi Famisa December, 2015 Supervisor: Sigurd Skogestard

2. 2 Objective of the project  Industrial use of the subsea separation module  Build a steady state model in HYSYS  Explain the model  Compare to Preben Thesis 2015  Research challenges

3. 3 Outline Introduction: Following largely from the advange of economics of cost and other advanges listed below; Subsea production and processing is currenty at the forefront of research development. Advantages:  Enhanced Oil recovery (EOR) from Reseirvoir  Increased production  Water treatment before injection to the sea  Friendly environmental impact  Operations at seabed instead of topside that requires huge space and cost.  Improve subsea system reliability and operability

4. 4 Why control? Operation time Actual value(dynamic) Steady-state (average) In practice never steady-state: Feed changes Startup Operator changes Failures ….. - Control is needed to reduce the effect of disturbances - 30% of investment costs are typically for instrumentation and control “Disturbances” (d’s)

5. 5 Oil-Water Separation

6. 6 Principles of Oil-Water separation Horizontal gravity separator: The feed (oil-in-water emulsions) is acted upon by gravitational buoyancy forces. The oil droplets are pushed upward, the continuous oil phase is at the top of the separator while the pure water Phase settles at the bottom.

7. 7 Principles of Oil-Water separation

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9. 9 HYSYS MODEL

10. 10 Results Effects of flow rates on the purity of LPO/HPO

11. 11 Results Effects of oil cut on the purity of LPO/HPO

12. 12 Conclusions  Principle used in the liquid-liquid separation is similar to that of gas-liquid separations  The model shows good agreement with Preben Thesis 2015  The model requires integration of dewaterer and deoiler to further purity the outlet streams to meet the Regulatory requirement

13. 13 Recommendation  The model requires integration of dewaterer and deoiler to further purify the outlet streams to meet the Regulatory requirement  Designing re-entrainment from equations in the model for better simulation  Compare results to experimental data

14. 14 Research Challenges  Modelling a two phase separator in HYSYS  Writing a subroutine in HYSYS  Modelling of an oil droplet in HYSYS  Designing re-entrainment from equations in the model for better simulation

15. 15 Thank you