To main content

Wintershall RAVN and A6-A

Wintershall Noordzee B.V. installed a new remote platform RAVN as a crude production tie-back to A6-A. RAVN is a remote and unmanned crude well unit. Utilising a dry-tree design, all control, power and metered injection for the well will be via the 18.2-km control umbilical between the new satellite platform RAVN in the Danish sector and the operational platform A6-A in the German sector.

The umbilical forms the entire link between the remote platform, supplying and controlling all functions and ensuring continual feedback and monitoring of RAVN.

The umbilical supplies all the necessary input data, control and feedback to eliminate the usual day-to-day requirements of direct human contact. The umbilical was installed from RAVN first end to second end pull-in at A6-A end. Platforms are located in the Danish territorial waters in the North Sea (RAVN) and German territorial waters in the North Sea (A6-A). The umbilical was connected/pulled into RAVN via a J-tube and internal conductor to the RAVN topside -TUTA. RAVN - first end with pull-in to topside deck via a J-tube - was laid in corridor separate from the 8-inch pipeline between RAVN and A6-A and second end pull-in using the quadrant method at the A6-A platform.

SCOPE OF WORK

  • Prepare project planning for Boskalis’ scope of work.
  • Survey work, including post-burial survey.
  • Perform route engineering and installation engineering to optimize the performance of the installation scope, including Orcaflex analysis for laying, pull-ins, loads and dynamics, as well as a detailed burial assessment study (BAS).
  • Prepare platform on RAVN and A6-A.
  • Define umbilical length together with the client.
  • Umbilical load-out at Hartlepool (UK) onto the installation vessel Ndurance.
  • Installation and hang-off of umbilical termination heads – topsides.
  • Crossing 36- & 40-inch live gas pipelines.
  • Pull-in at RAVN & A6-A platforms – direct from vessel as part of SIM-OPS.
  • Umbilical lay and bury scope – minimize on seabed exposure.
  • Mobilize and demobilize all installation spreads for Boskalis’ scope.
  • Provide engineering support during the offshore umbilical installation, including simultaneous burial.
  • Provide QHSE management for Boskalis’ scope.
  • Process and deliver as-built data.
  • Mobilize and demobilize all installation spreads for Boskalis’ scope.

Related projects

Selected filters
TSHD_Barent_Zanen_backfilling_at_Denia_header.jpg

Landfall construction
Balearic submarine pipeline

As part of its network expansion program, Enagas undertook the installation of a submarine pipeline providing natural gas from the Spanish mainland to the Balearic Islands of Ibiza and Mallorca, integrating them into the Spanish gas system. This 20" nominal diameter pipeline was constructed in two distinct sections, one of 123 km between the mainland and Ibiza and another of 146 km between Ibiza and Mallorca.

Read more
Baydaratskaya_Bay.jpg

Installation gas pipeline, Baydaratskaya Bay

The Baydaratskaya Bay Project is located in the Kara Sea in the North of Russia. The Kara Sea is bordered on its western side by Novaya Zemlya and on the east by the North Siberian Coast. Baydaratskaya Bay is located in the south of the Kara Sea between the Ural Coast and the Yamal Peninsula. Yamalgasinvest (Gazprom) is planning the construction of four pipelines and two cable crossings at Baydaratskaya Bay for the exploitation of the Bovanenkova and Harasawejskoje gas field on the Yamal Peninsula.

Read more
DPFV_Seahorse_moors_for_loading_header.jpg

Free span rectification gas pipeline, East Java

The existing live 28" East Java Gas Pipeline runs offshore from the Kangean Block, close to Pagerungan Besar Island, Kangean Islands, Indonesia, through the Madura Strait and onshore via Porong to Surabaya, Indonesia’s second largest city.

Read more
Installation_of_cofferdam_to_enable_trench_excavation_through_surf_zone_header.jpg

Crude oil unloading facilities, Sri Racha

Thai Oil Public Company Limited is the largest petroleum oil refiner and supplier in Thailand. To enable Very Large Crude Carriers (VLCC) up to 320,000 DWT or a freight capacity of up to two million barrels to berth at Thai Oil's refinery in Sri Racha, Chonburi Province, a second Single Buoy Mooring (SBM) facility was installed approximately 14 km offshore, in water depths of around 30 m. From this buoy, a 52' diameter concrete coated steel pipeline had to be installed to the landfall location near the Thai Oil refinery.

Read more
HL_Stralsund_header.jpg

Bridge construction, Stralsund

SMIT’s 1,200 tonnes sheerlegs Taklift 7 completed a major German bridge building programme during 2006. The sheerlegs had spent several months at the new Stralsund Bridge, on the German Baltic coast. This suspension bridge links the mainland with the island of Rügen.

Read more
Rion_Antirion_header.jpg

Heavy lift operations, Rion Antirion bridge

The Rion Antirion bridge, a 2.3 km long cable stayed bridge, consisting of 4 pylons from which the bridge deck is suspended. SMIT was involved in two phases of the project. During the construction of the pylons, SMIT carried out the management for the tow-out and positioning. For the installation of the steel components SMIT carried out the heavy lift operations.

Read more

Dredging & Inland Infra

Offshore Energy

Salvage

Read more

Read more