Subsea Compact All Electric Pump - Carbon Footprint Optimized

The world demand energy efficient solution generally focusing on sustainable resource management. Our future depends upon development of technology that can move us in direction of less carbon footprint while we transition to more renewable energy sources in a responsible manner for future generations. The oil and gas resource will remain several decades more, however there are several opportunities optimizing production while handling CO2 by capture and storage, or alternatively CO2 as a transition into new material that can be utilized. There is substantial research in this domain. Meeting future we generally need to optimize the larger puzzle utilizing existing and new building elements. The new pump in this project is such a new building element useful in several new applications. The new pump will apply input from decades of experience in the subsea pumping domain establishing a new pump design which is cost effective, energy efficient and reliable; all leading up to a low carbon footprint. The new pump will be a very interesting product that can enable longer distances from power source that alone can remove need for a floating platform. Or alternatively, in some location, can make existing obsolete platforms into a renewed asset as unmanned power hubs. This will alone have huge cost- and carbon footprint benefits. In short; This pump technology is more adaptable to a larger location base without anything else than the need of electrical power. This will make systems generally suitable meeting future minimized, or even zero CO2 footprint solutions. The first prototype is addressing Subsea Seawater Injection Systems (SSTI) specifically, however with the new platform other application and processing media will emerge. In the project the concept has been developed further by detailing the different parts in the machine and by performing analyses within different disciplines. A closed dialogue of vendors for materials, Components, Production and Assembly has taken place. This work is essential to ensure performence, quality and reliability of the new pump.

Outcome of the project is that we understand importance of stator to canning interface, both in terms of a mechanical and thermal point of view. OneSubsea has further quantified CO2 footprint and improvements this technology can lead to. It was unfortunate that the Sea Water Injection market did not pick up as anticipated, however it is interesting how things will evolve in Emerging energy and low carbon solution sometime in the future.

The project comprises designing, building and testing a subsea all-electric pump based on the functional requirements of NOV Seabox's subsea water treatment filter pump. OneSubsea has extensive experience with designing and delivering subsea pumps, and the new pump will to a large degree be based on OneSubsea proven technology. The key novelty is related to abandoning barrier fluid flow from the motor and pump internals into the pumped flow. This will be achieved by canning the motor stator, and let seawater lubricate the seals, bearings and motor rotor. This pump has several advantages over other barrier fluid less pump concepts. A key advantage is that it leverages the experience of the world's leading supplier of subsea pumps. Secondly, but equally important, the concept is designed for expansion. Where, for instance, pump concepts applying magnetic couplings are unfeasible above 1500 kW, the predicted efficiency of the OneSubsea pump and motor allows for increasing the power rating up to 6000 kW. This implies that the concept can be utilized at a wider range of application, for instance water injection and multi-well boosting. OneSubsea's engineering resources in Bergen, Askøy and Asker are highly experienced in pump and motor design, as well as research and development projects. Two dedicated team is working solely on qualification programs: one team doing design and analysis and the other responsible for test set-up and test execution. The test execution will take place at OneSubsea's test facilities Horsøy in Askøy county. The test facilities comprise a wide range of equipment needed for testing subsea pumps, including flow loops, drive systems and test pits.