This liquid has to be entirely free of harmful substances to avoid damaging the oil and gas resources. Injecting water to maintain reservoir pressure was necessary from the start. Work on preparing the rig for removal began on 10 April that year, and the last of 26 heavy lifts was completed on 10 May exactly a month later. The drilling equipment was integrated in the topsides, with the derrick movable so that it could be positioned over the relevant well slot. Draugen GBS Shaft Safety Study – Management report. Flacs software. Hentet fra DrillingĪchieving the output planned for the first year depended on being able to drill and produce oil in parallel through the single platform shaft. These utilised the flame acceleration simulator (Flacs) – a special computer programme developed at the research facility a few years earlier for several large international oil companies. To optimise the topsides design, Kværner Engineering and Shell commissioned special calculations from the Christian Michelsen Institute in Bergen. When the platform came on stream, the topsides had a dry weight of about 18 500 tonnes. That also made an important contribution to keeping weight down. Photo: A/S Norske Shell/Norwegian Petroleum Museum Dekket design og innhold, Modules to be placed in the shaft are being completed at Vats. Design of the Draugen Topsides for the Effects of Gas Explosions. Paper presentert på OTC 6477. In particular, the choice of an open truss construction and the use of floor gratings rather than deck plating reduced possible overpressures in the event of an explosion. Safety was a key factor from the very start in developing the platform concept, and the threat of explosion in its various areas came to have a big impact on the final solution. The derrick adds almost 50 metres more, and the total height from the bottom edge of the GBS skirts to the derrick tip was about 370 metres. With a footprint of 78 by 48 metres, including the external gangways, the topsides measure 32 metres in height from the top of the GBS shaft to the upper surface of the helideck. The integrated approach yielded a very compact topsides solution with an efficient relationship between weight and capacity. A Condeep monotower made it possible to retain the basic topsides configuration without a new round of design and planning work. Studies found that either a semi-submersible similar to a drilling rig or a tension-leg platform (TLP) would be the cheapest option.īut the final choice was determined by costs associated with operating and maintaining the support structure. Operator Norske Shell’s main alternatives up to a final decision on the plan for development and operation (PDO) of Draugen were the concrete monotower or a floating unit. Illustration: Norwegian Contractors/Norwegian Petroleum Museum © Norsk Oljemuseum Dekket design og innhold, engelsk, NC's monotower concept.
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