Simplification and cost efficiency are key drivers in the implementation of subsea boosting systems, particularly for marginal fields. The development of higher-voltage motors for subsea applications has presented an opportunity to enhance the economics of long-distance subsea boosting. By operating directly at higher voltages, these motors eliminate the need for subsea step-down transformers, significantly reducing the complexity, size, and cost of subsea installations. This innovation enables the design of the subsea end of the system to be streamlined, simplifying deployment and reducing failure points. Topside, higher-voltage systems require smaller and lighter equipment, leading to weight and space savings. These benefits collectively reduce capital expenditures and simplify integration.

The extended step-out and power capabilities offered by higher-voltage motors address critical limitations for traditional subsea boosting systems. For longer tiebacks and high-power applications, this technology delivers a more scalable and economically viable solution, enhancing the feasibility of subsea boosting for conventional and marginal fields. The integration of higher-voltage motors has the potential to significantly increase the profitability of subsea developments in fields where traditional configurations are cost prohibitive.

This paper explores the technical advancements in high-voltage motor design, their impact on topside and subsea system architectures, and the resulting economic implications for subsea production. A case study analysis highlights how this approach can unlock new opportunities for subsea tiebacks, demonstrating its value in enabling cost-effective energy distribution over a wide span of step-out distances and power ranges.