Gas Compression Magazine

October 2016

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GE GOES DEEP WITH BLUE-C A/S Norske Shell has successfully completed system testing of the world's first subsea gas compression system with a full subsea power supply, transmission, and dis- tribution system. At the heart of the system is GE Oil & Gas' Blue-C subsea compressor – a 12.5-MW, fully marinized, verti- cally orientated centrifugal compressor. The Ormen Lange Pilot was the first of its kind and was designed to test a full-scale, integrated subsea compression system in submerged conditions with real hydrocarbons. It has been run by A/S Norske Shell and its license partners Petoro, Statoil, Dong, and ExxonMobil since 2011 at Shell's test facility at Nyhamna in Norway, where the gas from the Ormen Lange field reaches shore. GE has been a key collaboration partner with Shell in the de- velopment of the compression system and has supplied a num- ber of technologies. The system enables operators to conduct gas compression on the seabed, reducing the need to introduce additional power generation on nearby offshore facilities. "We are very proud of what we have achieved in partnership with Shell," said Neil Saunders, President & CEO, Subsea Systems & Drilling, GE Oil & Gas. "We leveraged the GE store, using our domain expertise and heritage across the GE portfolio, includ- ing rotating machinery, power electronics, high-voltage designs, and subsea production systems. Today, we are designing the next generation of compact and modular subsea compression systems to unlock new possibilities for power and processing worldwide." The compressor is driven by an electrical package provided by GE's Power Conversion business. The high-speed motor and the high-power drive are capable of operating hundreds of meters below the sea level, according to GE. The GE technologies that were tested as part of the Ormen Lange Pilot included: BLUE-C SUBSEA COMPRESSOR • Operating pressure up to 2538 psig (175 bar) • Up to 635,664 ft 3 (18,000 m 3 ) hourly production flow • Vertical arrangement: electric motor on top; single-shaft line (rigid coupling) • 3000 to 11,000 rpm operating speed • 12.5 MW electric motor; natural gas cooled, 6.6 kV/1.6 kA • Three canned radial active magnetic bearings; one canned axial active magnetic bearing SUBSEA POWER SUPPLY, TRANSMISSION, AND DISTRIBUTION SYSTEM • Subsea Switchgear (SWG) – supplies power and protection to multiple loads from a single cable to shore. • Subsea Variable Speed Drives (VSD) – takes out- put from the subsea switchgear and provides the optimal frequency for the individual supply lines feeding the com- pressor and pump. • Subsea Uninterruptible Power Supply (UPS) – supplies power and protection to all the subsea compres- sion station auxiliary loads, ensuring continuous supply of power during system disruptions to protect the subsea compressor and ensure a safe shutdown process. • MECON Dry-Mate Connector 145/700 – enables power transmission at 145 kV for a 74.56-mile (120-km) tie-back distance. IFOKUS Electric Actuators – anti-surge actuators developed for 80 kN fail open operation. NAXYS Acoustic Leak Detection System – used during the submerged pit testing to monitor for potential gas leakages as well as operation of rotating machinery and power modules.

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