All-Electric Subsea Processing Advances With Testing of Subsea Variable Speed Drive
The first full-scale prototype of a subsea variable speed drive (VSD) was tested last month in a sheltered harbor in Vaasa, Finland. Designed for subsea gas compression, the subsea VSD operated over 3 weeks in a back-to-back configuration directly with the grid, without motor loads.
A 5-year joint industry project (JIP), started in 2013 between Chevron, Total, Statoil, and ABB, aims to develop transmission, distribution, and power conversion systems for subsea pumps and gas compressors operating at depths of 3000 m and over long distances.
The VSD uses a pressure-compensated design, whereby its power components are cooled by being submerged in oil. The water test proved that the electronic and power components can meet the thermal performance demanded. Before the test, the main drive sub-assemblies and components were pressure-tested at 300 bars in Statoil’s R&D facility in Trondheim, Norway.
Bazmi Husain, ABB CTO, said, “We have demonstrated the successful and reliable operation in a number of high-stress conditions. This is a major milestone in solving such a grand challenge. It takes technology from the laboratory to the field in a structured qualification and pragmatic process, via prototypes and multiple demonstrations.”
The goal is to take power distribution from onshore to the seabed with up to 100 MW capacity being transmitted 600 km to free up the limited space on topside installations. Reduction in costs is possible by having one cable that is distributed to many subsea loads. Additionally, operational costs are reduced, energy and CO2 emissions are lowered, while marine pollution is cut and decommissioning is simplified.
We have to prove to our customers that the entire installation is going to be ultra-reliable because pulling up equipment from 3000 m costs a lot of money,” said Per Erik Holsten, managing director of ABB’s Oil, Gas, and Chemicals business.
The next step is the 3,000-hour shallow-water testing of a subsea power system with two VSDs in a parallel, combined with subsea switchgear and controls, targeted to start late 2018. The first installation of the new subsea power systems in offshore production sites are expected in 2020.
For Further Reading
OTC 27684 Subsea Power JIP—As Enabler for All-Electric Subsea Production by J.Ø Bugge and S. Ingebrigtsen, ABB.
C-Innovation Opens New Dock Facility for Subsea Work
The Port Fourchon, Louisiana, facility will serve as the base for the company’s operations in the area. Its subsea services group has performed multiple hydrate remediation projects in the US Gulf of Mexico since its formation.
Surface-Facilities Design for First CO2 EOR Project in Saudi Arabia
A demonstration project of carbon capture, utilization, and storage through enhanced oil recovery was conducted in Saudi Arabia. Surface facilities for such projects are expensive to build and involve tradeoffs in options based on economics for a given set of conditions.
Savvy Separator: 5 Lessons To Simplify Separator Troubleshooting
Troubleshooting and solving separation problems takes a combination of analytical tools, experience, and a knack for investigation. These 5 lessons provide a starting point for assessment.
Don't miss out on the latest technology delivered to your email every two weeks. Sign up for the OGF newsletter. If you are not logged in, you will receive a confirmation email that you will need to click on to confirm you want to receive the newsletter.
26 September 2018
02 October 2018
10 October 2018
21 September 2018