Statoil using Nexans DEH in Norwegian Sea

December 1, 2014

Statoil, on behalf of Wintershall, signed a contract with Nexans for the supply of direct electrical heating (DEH) technology.

The DEH riser will connect the Kristin and Maria fields in the Norwegian Sea with the Kristin platform, ensuring the constant flow through pipelines. Production of the DEH riser will start during autumn 2015, with delivery taking place during 2Q 2016.

The delivery, worth approximately US$16.2 million (€13 million), will replace an existing DEH riser cable from the Kristin platform. The new riser cable will connect the Kristin platform with a subsea connection box, and will contain four cores to enable the operation of one DEH line to the Kristin field and one to the Maria field.

DEH is a flow assurance method used on many pipelines. The method is based on controlling the temperature on the pipeline by passing electric current through the steel wall of the pipeline, thus preventing hydrate and wax formation. At more than 300m depth, the water is just above zero degrees Celsius.

Floating platforms like Kristin feature a riser system containing flexible production lines, water injection lines, gas injection/lift lines, umbilicals controlling the subsea templates and electrical cables for heating the pipelines.

In addition, Nexans has been awarded a subcontract by FMC Technologies for a dynamic control umbilical system for the same project.



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