Neptune Energy has installed four enhanced horizontal subsea tree systems for the Duva development project in the Norwegian sector of the North Sea.

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The installation was carried out by a vessel instead of a rig, which Neptune said cut installation time, costs and operational emissions.

The operator calculated the 20 days of reduced rig time is equal to about $12 million savings for the licence partners.

The Duva development, on production licence 636, is an oil and gas subsea tie-back to the Gjoa semi-submersible facility. Neptune is operator of both Duva and Gjoa.

Neptune’s director of drilling and wells in Norway Thor Lovoll, said: “By introducing the latest available technology combined with quality planning and teamwork, we completed the installation safely, successfully and ahead of schedule.

"Deploying the subsea trees from a vessel saved about 20 days of rig time, reducing costs, time and emissions.”

The drilling rig Deepsea Yantai, operated by Odfjell Drilling, will drill and complete the remaining sections of the Duva well programme during the second and third quarters.

First production from Duva is expected in the third quarter this year.