Topsides assembly and contract problems
Stavanger’s Rosenberg Verft yard won the job of assembling the Draugen topsides in early 1990. This massive jigsaw formed an integrated structure, with components and equipment packages put together at the construction site.
Arbitration win for Kværner
A big battle was fought over the bill for fabricating the Draugen platform topsides at the Kværner Rosenberg yard in Stavanger. The dispute ultimately had to be settled by arbitration.
Drilling on Draugen – a completely new concept
Great emphasis was placed by Norske Shell on safety and the working environment when the drilling module for the Draugen platform came to be developed.
The Draugen Reservoir
Draugen lies in block 6407/9. Included in the eighth licensing round in the autumn of 1983, it was awarded the following March to Shell as operator and partners Statoil and BP.
The architect’s role
Combining good and pleasant accommodation with safe and effective access to work areas was a key requirement in designing the living quarters for the Draugen production platform. Bernt Bekke landed this job in 1988.
The topsides – design and content
The Draugen platform’s topsides – the part which rests on the concrete gravity base structure (GBS) – is based on an integrated design. That gives a compact solution with no use of modules.
Awarding the production licence
Norwegian blocks first became available above the 62nd parallel (the northern limit of the North Sea) with the fifth licensing round in 1979. And acreage was finally awarded across the whole Norwegian continental shelf (NCS) – from the North to the Barents Seas – during the eighth round in 1984.
Contracts awarded in 1989-90
Norske Shell found 1989 a busy year for contract negotiations and awards, related not only to Draugen but also to its Troll A gas development in the North Sea.
Squaring the circle
The Draugen platform comprises a round concrete monotower and an almost square steel topside. Putting drilling and oil transport functions in a single shaft posed a range of safety challenges. Moving from circular to square cross-section also proved testing.
Building the GBS
Casting the concrete gravity base structure (GBS) to support the Draugen platform proved more challenging than the project organisation had expected.
Completing and installing
Mating the concrete support structure and topsides for the Draugen facility and installing it on the field were not entirely without complications.
Mating and tow-out.
Mating and tow-out.
The Condeep story
When Norway became an oil nation in the late 1960s, few people expected Norwegian construction companies to be among the biggest suppliers to the forthcoming North Sea developments.
The Sleipner sinking and Draugen
The concrete gravity base structure (GBS) for the Sleipner A platform sank to the bottom of the Gands Fjord outside Stavanger during a test submersion on 23 August 1991.
When oil and gas production moved into deeper waters, the loads on gravity base structures (GBS) used to support platforms increased.
The ringing phenomenon
Model tests with the Heidrun tension-leg platform found that large irregular waves created oscillations which had a big impact on total tension in the tethers. The effect is termed “ringing”.
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