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Duva subsea tree installation project cuts time, costs and emissions
Neptune Energy has completed the installation of four enhanced horizontal subsea tree systems (EHXTs) for the Duva development in the Norwegian sector of the North Sea. The installation was carried out by a vessel instead of a rig, reducing installation time, costs and operational emissions.
The Duva project, on production licence 636, is an oil and gas subsea tie-back to the Gjøa semi-submersible facility. Neptune Energy is the operator of both Duva and the Gjøa facility. While conventional installation of EHXTs would be carried out with a drilling rig, the Duva EHXT installations were conducted using the vessel Far Samson, operated by Solstad Offshore. According to Neptune this saved about 20 days of rig time, equivalent to approximately $12mn in savings for the license partners. Furthermore, emissions were reduced by more than 60% during the installation activities.*
Gross 2P reserves at Duva are put at 88mn boe (of which gas accounts for 76%). First production is expected in 3Q2021. The licence partners are Neptune Energy (operator, 30%), Idemitsu Petroleum (30%), PGNiG (30%) and Sval Energi (10%).
*Calculations based on direct emissions from operating a drilling rig with associated support vessels and helicopter transport versus the use of one vessel.
Photo: Neptune Energy