Since 2015, we have supported the Åsgard project with a subsea gas compression system that has run with an uptime of close to 100%. Designed to open new opportunities in deeper waters, harsher environments and areas far from shore, we have supported Åsgard across four subsea compression elements, with the engineering, procurement and construction (EPC) of a fifth compression module to be delivered in 2025.
The world’s first subsea gas compression system came online at Åsgard in September 2015, with the objective to improve recovery while at the same time yielding a significant reduction in energy consumption and CO2 emissions across the life of field.
Moving gas compression from the platform to the wellhead can boost recovery rates up to 90%, meaning that an extra 306 million BOE of gas can be extracted. We have continued to work with Equinor to prepare for extended operations at the field, and are continuing to find solutions to enhance production and extend the field’s lifetime as the pressure in the reservoir naturally declines.
In 2015, we installed a compression system at Åsgard on the seabed to improve recovery rates and reduce capital and operating costs. The Åsgard system in 2015 comprised modules for two identical sets of compressors, pumps, scrubbers and coolers, fitted together in an 1,800-metric ton steel frame.
In 2021, we successfully delivered Module 4 in the Åsgard Subsea Compression Project, a dual-function module with pilot-testing capabilities in addition to having all the required actions for continuous subsea operation. The engineering is based on the phase one design with necessary modifications to incorporate an additional overhung compressor and liquid injection in the revamped HP compressor. A key engineering challenge has been to incorporate more equipment and larger pipe sizes while maintaining total weight and structure dimensions.
By May 2022 we completed Åsgard Subsea Compression Project phase II, a critical milestone in enabling production extension and setting the field up for constructing and delivering Module 5 by the end of June 2025.
By using subsea multiphase compression, Åsgard should see recovery boosted by approximately 306 million barrels across its life, which translates to a recovery rate of 90% (up from less than 60% pre-subsea compression).
This subsea technology yields a significant reduction in energy consumption and CO2 emissions in a life-cycle account for Åsgard. Through further optimisation, the technology also represents a potential for additional CO2 reductions in future subsea solutions.
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