The Saipem 7000 vessel has lifted the 3,500-tonne Dvalin gas-treatment module aboard the Heidrun platform in the Norwegian Sea in what Wintershall Dea GMBH calls one of the heaviest lifts onto an existing platform ever offshore Norway.
Wintershall Dea operates high-pressure, high-temperature Dvalin gas field, which is being developed with four subsea wells in 400 m of water tied back to the Heidrun platform operated by Equinor (OGJ Online, Oct. 4, 2016).
Aibel built the gas-treatment module for Equinor at its yard in Haugesund. The lift onto the Heidrun platform took 3 hr. A 400-tonne Dvalin utility module was installed earlier.
A 15-km pipeline will connect Dvalin’s 300-tonne subsea template with the platform, where produced fluids will be partially processed. From Heidrun, Dvalin gas will move through a 7½-km pipeline to the Polarled gas transportation system, which will carry it to the Nyhamna onshore gas treatment for further processing.
Production will be from Middle Jurassic Ile and Garn sandstones encountered at about 4,250 m. Wintershall Dea estimates reserves of the field, which is northwest of Heidrun, at 113.3 million boe. Production is to start next year.
Dvalin interests are Wintershall Dea, 55%; Petoro, 35%; and Edison, 10%.