Z-Line at Huldra platform

Norway-based well intervention services provider Ziebel has completed a distributed fibre-optic (DFO) sensing campaign for Statoil on the North Sea Huldra platform.

Ziebel gathered distributed temperature and distributed acoustic fibre-optic data on Statoil’s first unmanned platform using its new gravity-deployed carbon composite cable Z-Line.

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Production at Huldra ceased in September 2014, with the intervention campaigns aimed at optimising Statoil’s plans to plug and abandon the installation in 2016.

Ziebel carried out the work on the platform by running the Z-Line in two wellbores to measure temperature and acoustic profiles.

After completion of each operation, data displaying the conditions of each well in its entirety during each intervention was provided.

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"As Statoil prepares to plug and abandon the Huldra platform, we appreciate how important it is to have a comprehensive picture of well conditions in order to formulate the optimum approach."

Statoil used the data to observe fluid movements, confirming wells’ integrity, and planning the final abandonment.

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Ziebel chief executive officer Stig Hognestad said: "As Statoil prepares to plug and abandon the Huldra platform, we appreciate how important it is to have a comprehensive picture of well conditions in order to formulate the optimum approach.

"Given that it was the first time that Ziebel has worked for Statoil, it was very satisfying that we were able to use the Z-Line to provide them with critical data that will enhance their understanding of those conditions."

The 3/16in diameter carbon composite line Z-Line builds upon the Z-System carbon composite technology and is with embedded optical fibres at its core.

Using Ziebel’s fibre-optic composite rod technology, the complete well bore can be accessed and visualised in real-time.

Image: Interventions were carried out at Huldra platform to optimize Statoil’s plans to plug and abandon the installation in 2016. Photo: courtesy of Ziebel AS.