P11-Unity platform installed offshore the Netherlands

Heerema’s semi-submersible crane vessel Sleipnir has installed Dana Petroleum’s P11-Unity platform in block P11b in the Dutch North Sea.

 

At 395 metric tons (435 tons), this is said to be one of the world’s smallest platforms.

 

Heerema was contracted for the transportation and installation of the P11-Unity by HSM Offshore, who fabricated the platform at its yard in Schiedam.

 

On the 22nd October the Sleipnir lifted the platform from the vessel’s deck to the seabed.

 

This operation took about an hour. The P11-Unity will support the development of the Witte de With and Van Ghent East gas accumulations, using a new ‘back-to-basics’ design platform to produce two fields.

 

The company’s scope included the lifted load-out of the platform from HSM Offshore’s quayside at Schiedam. Bonn & Mees executed the lift on the 15th October and the platform was loaded-out onto Heerema’s 122-metre (400-foot) long barge H-406.

 

On the 17th October, Müller transferred the platform to the Sleipnir’s mooring location at the Port of Rotterdam.

 

After installing the Tolmount platform in the UK southern North Sea, the Sleipnir arrived in the Port of Rotterdam to lift the P11-Unity onto the vessel’s deck on the 19th October and secured the tripod for transportation to the offshore location.

 

The vessel was mobilised on the 22nd October and after an eight-hour sail the Sleipnir arrived on location, around 67 km (42 miles) off the coast of Scheveningen.

 

The P11-Unity is a minimum facilities wellhead platform that was pre-commissioned onshore to minimise the offshore construction scope.

 

The platform is designed for marine access only, using similar principles to the offshore wind industry, Heerema said.

 

It will be remotely operated from the host P11-B-De Ruyter platform, also operated by Dana Petroleum.

 

First gas from the P11b Unity development project is expected in the second half of 2021.

 

Source: Offshore Magazine