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Offshore Wind Outlook
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FEATURE SUBSEA TIEBACKS tion burning natural gas compared to coal generates 50% less 2002. The Troll A gas platform, standing on a massive con-
CO2, says Ramberg. crete support structure, is the tallest structure ever moved “This is also a really good example of how subsea tieback by humans over the surface of the earth, according to the projects can be really economic, with only minor topside Guinness Book of Records. modifcation, we have been able to use the installed capacity But it could have been bigger. A lot of thought also went using the subsea technology to get all the gas back to Troll A. into the design of Troll A. Processing was moved from off-
This is a really good example how proftable subsea solutions/ shore to Kollsnes, onshore, so that the facilities could be tie-backs can be in our projects.” The project has also beneft- smaller. Troll A was also built to be powered from shore ted from forward thinking by Shell, as the development op- with Norway’s green hydropower electricity – and it re- erator for Troll A, resulting in pre-installed critical equipment mains so. Thought also went into the future phases of Troll now being utilized by the Troll Phase 3 project.Troll – a big – including having pipe bends ready to be used to tie in new project from day one. subsea pipelines; they were stored from day one, ready and
Despite the low break-even price and carbon intensity, it’s waiting at the bottom of the massive concrete riser shafts still a big project. Everything about Troll is big. It contains the facility stands on. some 40% of the total gas reserves on the Norwegian con- “Back in the 1990s, they were really ahead of their time,” tinental shelf (NCS). It’s also one of the largest oil felds on says Line Hoff Nilsen, Troll A platform manager. “They the NCS, producing 400,000 barrels per day at its peak in planned for connecting more pipelines to the platform; a
The H-Frame used to install the 36in spool.
Source: Equinor 22 OFFSHORE ENGINEER OEDIGITAL.COM