An attempt was therefore made to create competition. Shell wanted to try to avoid NC – the sole supplier of concrete GBSs to date – being its only option. Photo: Tidens Krav/Norwegian Petroleum Museum plattformen et unikt konsept, bygging, engelsk, The concrete skirt was built in Jåttåvågen and Gandsfjorden. Submitted in September 1987, the PDO for Draugen was approved by the Storting (parliament) on 19 December the following year. The concrete structure was required to support a topside weight of 22 000 tonnes and to store a million barrels of crude oil. Fotnote: Draugen GBS Shaft Safty Study (report No. In addition, these assessments showed that the level of risk for simultaneous drilling and production was the same for the various designs. Photo: Tidens Krav/Norwegian Petroleum MuseumĪt the same time, it became important to demonstrate that drilling wells and producing oil simultaneously through a single shaft fell within the required safety margins.Ĭalculations indicated that the risk of accidents with a monotower solution did not differ significantly from alternative solutions with several shafts. plattformen et unikt konsept, på trykk tk, engelsk A/S Norske Shell's Vice President, Paul Skinner (left), and Director for exploration and production, Wim Steenken (right), together with the oil and energy minister Arne Øien. This also provided sufficient support for the topside design and room for 10 wells to be conducted to the process facilities. The cheapest of the fixed concrete GBS solutions, ranging from one to four support shafts, was the monotower. Fotnote: Draugen Field Plan for Development and Opreation Appendix VI Concept Selection An economic analysis also showed that a fixed installation yielded the best internal rate of return on the huge investment involved. While a monohull FPSO basically represented the cheapest option, a fixed structure was recommended because it best satisfied Shell’s stated reliability and storage requirements. In other words, this solution represented an improved but not final version of the concept presented in the plan for development and operation (PDO) of Draugen. Fotnote: E-mail fra Dag N.jensen plattformen et unikt konsept, utbygging, illustrasjon, forsidebilde Illustration: A/S Norske Shell/Norwegian Petroleum Museum This aroused such great interest that the company revised its choice of concept, asked for further documentation, and ended up going for a GBS. Olav Olsen calculated and calculated, Tor Ole put the drawings in my letterbox during the night and I took the first flight to Stavanger the next day to present the drawings to Shell with some verbal cost and planning estimates. I talked with Tor Ole Olsen at the Dr Techn Olav Olsen consultancy, and we agreed to create a monotower platform. We, in other words NC, could not give up that easily, so I told Shell there and then that we had a better solution and agreed to meet the company in Stavanger at 08.00 the following day. Then Shell called me – I think it was Serge Leijten – to say that they had now decided that a semi was the best option. NC construction manager Dag N Jensen recalls the process: Photo: BP Norge A/S/Norwegian Petroleum MuseumĪfter all, this construction company could point to great success during the 1970s and 1980s with its Condeep design, not least on the Statfjord and Gullfaks fields. plattformen et unikt konsept, engelsk, Olav Olsen. While Shell considered various solutions – floater, steel jacket (support structure), gravity base structure (GBS) and so forth – Norwegian Contractors (NC) promoted its concrete option. All the options had to satisfy the same operational assumptions in terms of production capacity, wells and transport capability. This quartet was then subjected to a year of further detailing and comparison with the implementation plan, the economics of the project, general operations optimisation and key uncertainties with the proposed technology. – a weather-adapted monohull production floater with possible oil storage and offloading (FPSO)
– a semi-submersible platform with attached storage ship – a fixed concrete platform with integrated topsides Four options remained for further consideration in May 1986.
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