This paper describes how optimal system solutions at the seabed can be established to maximise field value. This optimisation involves implementation of subsea processing, which offers several alternatives to increase recovery, accelerate production and/or reduce CAPEX / OPEX. Too often considering added value by subsea processing, the estimated benefits are limited to a CAPEX comparison exercise. However, applying subsea processing also will enhance the production performance of the field, thus improving the income side of the project. This paper will focus on to what degree implementation of subsea processing will change the production profiles, and subsequently, to what degree this will add value to the field development. The paper describes the modelling of the integrated production system, which interactively combines the reservoir performance, the field development layout and the downstream infrastructure. This modelling approach makes it possible to optimise the design of the production system, and to establish the corresponding production profile reflecting the field development option considered. The case study presented describes system optimisation for a satellite tie-in to existing infrastructure with application of subsea processing. Three scenarios are established for comparison; a base-case system without subsea processing, a scenario including subsea processing with base-case production profiles, and a scenario including subsea processing with optimised production profiles reflecting the real operational constraints of the infrastructure.

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