TOTAL is strongly committed to the strategy to have, in the coming years, seamlessly integrated all-electric systems as part of the available technologies for future subsea and deepwater developments. It is part of the company's road map to accomplish flexible and configurable systems to meet the assets requirements in terms of functionality, safety and availability, but also that can reduce CAPEX and OPEX.
This paper will evaluate the impact of technology change from electro-hydraulic to all-electric system in the recently started Laggan-Tormore field in the UK shelf.
It will be shown that by proposing new all-electric technologies, currently or shortly available, it is possible to reach functional specifications and potentially reduce CAPEX and OPEX keeping system overall availability.
All-electric systems were investigated for Laggan-Tormore, an already delivered project, originally with electro-hydraulic technology, in order to evaluate the pros and cons of their implementation in future fields. Currently available all-electric building blocks were considered in the analysis, such as DC/FO distribution system, electric Xmas trees (or those driven by electric actuators) and electric downhole safety valve. Additionally, a future subsea compression expansion in the field was also considered and subsea power equipment maturity was assessed, as well as the interface with LV distribution and control systems.
This paper will present a proposed all-electric architecture to meet the project's functional specifications. This architecture will be assessed in terms of system optimization and facilities CAPEX.
New ways to safely design subsea power and communication will be presented, with the introduction of recently qualified technology. The benefits in terms of functionality, system availability, CAPEX and OPEX will be discussed.
