![]() ![]() The Gullfaks field lies roughly 200 kilometres north-west of Bergen. In addition, a concrete GBS could support a larger and heavier topsides than a jacket and provided oil storage which served as a buffer against production shutdowns in bad weather. That could be a big challenge in waters which are often stormy and rough. With a platform supported on a steel jacket (framework), much of the outfitting work must be done offshore. The deep and well-sheltered fjords in western Norway also lie relatively close to the NCS fields, which was a precondition for building this type of structure efficiently. It could then be moved to the Norwegian continental shelf (NCS) when weather conditions were suitable. The Condeep concept also allowed the whole platform – GBS and topside – to be made ready inshore. Photo: Øyvind Hagen/Equinor Opting for concreteĪs a construction material, concrete is very strong and durable. Sleipner A II and Troll A at the dry dock in Jåttåvågen. Fotnote: For a detailed introduction to building a Condeep, see Sandberg, Finn Harald, 2018, Building the GBS, Industrial Heritage Draugen, (accessed 25 April 2022). The topsides were floated over it, the GBS deballasted, and the complete platform towed out to the field. When the steel topsides for the platform were to be installed, the GBS was ballasted down until only a small portion remained above water. The base of a concrete GBS was cast in a dry dock before being towed into a suitably deep fjord for construction to continue upwards. Utviklingen av Condeep-plattformene og Statoils forhold til plattformkonseptet 1973-1995, master’s thesis in history, department of archaeology, conservation and history, University of Oslo: 36. ![]() Fotnote: Larsen, Steffen, 2018, Betongplattformene i Nordsjøen. The outer cells extend down to form skirts which ensure a firm grip on the seabed. The last Condeep – Troll A in 1995 – stood 472 metres high and had a displacement of 1.1 million tonnes.Ī Condeep platform comprises a topsides, primarily in steel, sitting on one or more concrete shafts rising from a set of concrete cells for storing oil. This type of platform was built from around the mid-1970s until the mid-1990s, and is characterised by being very large and heavy. The name Condeep is short for Concrete Deepwater Structure, a Norwegian concept for a platform supported by a gravity base structure (GBS) which sits on the seabed under its own weight. It will then look at some of the reasons for that choice, before turning to Gullfaks and Statoil’s attitude to developing this field. This article will first present the Condeep design, which often came out on top when development decisions were made. Big financial and strategic interests underlie the concepts ultimately chosen by government and companies. Development solutions rank high among the major decisions in Norway’s oil history. ![]()
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