The trend in subsea development is heading towards simplification, industrialization, digitalization and commercial optimization in an environment of longer step-out and deep / ultra-deep water applications. With that the limitation of existing electro hydraulic systems as exposed. Statoil has launched an All-Electric Subsea (AES) initiative to prove the feasibility of new flexible, cost efficient subsea production system (SPS) to meet future demands. While most of the main technology elements are available and proven in use, full market and operator acceptance seems to be a challenge. However, in the current and future situation and with the experience gained from the Åsgard subsea compression system, all electric is considered as a feasible future option for SPS.
The strategy for the AES initiate is to identify all electric concepts with SPS vendors in order to establish cost effective solutions and strive for standardization of products and interfaces. The AES initiative aims to have system approach and examine the impact on all elements of a subsea development, i.e. covering topside, umbilical, SPS and downhole etc. This will ensure the benefit of an all-electric implementation is presented. The intention is to present the advantages seen with an all-electric for all aspects, i.e. with respect to cost, project execution, operational flexibility, standardization.
This paper will present the current status of the AES initiative covering:
the fundamental features of the AES technology and concepts
the potential of this technology for operation in production control systems
status of the all-electric initiative with respect to technology maturity
the activities required to close the identified technical gaps
the implementation of all electric SPS solutions