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New Technology Enables Development of Norwegian Sea Field

The Ærfugl field is a gas condensate field located in the Norwegian Sea. Heat input into the flowline system is required during shutdown and potentially also during off-plateau production periods. A new enabling technology known as electrically heat-traced flowline (EHTF) will be used to enable system startup and shutdown and to maintain production fluids outside of the hydrate envelope during steady-state operation.

Background

EHTF is a pipe-in-pipe (PIP) system in which heating cables are used to heat the inner pipe. This enables even longer tiebacks and development of fields with challenging hydrate characteristics. The Ærfugl field represents one of the first EHTF projects awarded.

System Configuration

Topside. The Ærfugl field will be tied back to the Skarv floating production, storage, and offloading (FPSO) unit. A container module with a transformer will be installed on the FPSO. From the transformer, the required three-phase voltage can be taken out by a tap exchanger. The three phases are then routed through the swivel paths to the turret, where they are split into multiple triplets in a busbar box. One swivel path is also occupied by fiber-optic (FO) cable, which is used for digital temperature monitoring.

Umbilical. The triplets are routed from the busbar box though the dynamic and static umbilical to the subsea umbilical termination assembly (UTA). The UTA is located close to the inline power-­inlet structure (ILPIS), which is the entry point for the power into the flowline. Electrical flying leads are used to connect the UTA to the ILPIS. The FO is also routed through the umbilical and connected to the ILPIS by flying leads.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper OTC 29523, “New Technology Enables Development of Field in Norwegian Sea,” by Arne Skeie, Subsea 7, prepared for the 2019 Offshore Technology Conference, Houston, 6–9 May. The paper has not been peer reviewed. Copyright 2019 Offshore Technology Conference. Reproduced by permission.
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New Technology Enables Development of Norwegian Sea Field

01 August 2019

Volume: 71 | Issue: 8

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