Thanks to good project management, project execution and hitting the market at a good point of time, the Langeled development is due to be completed about NOK 3 billion below budget and Ormen Lange on budget, Hydro's project director Tom Rotjer said to a large crowd of journalists at the ONS conference in Stavanger on Wednesday. Hydro is the development operator for the Ormen Lange/Langeled project, while Statoil has the management of the Langeled project in cooperation with Hydro.
The Langeled pipeline and receiving facilities in Easington are part of the Ormen Lange project, the largest gas field under development on the Norwegian continental shelf and what is currently one of the largest engineering projects taking place in the world. The project – developed by Hydro and its partners, is now 80 percent complete and is moving ahead on schedule.
Some of the world's largest pipelaying vessels are involved in the laying of the 100.000 pipes it takes to make the longest subsea pipeline in the world – 1,200 km long – from the onshore processing plant at Nyhamna in Norway to Easington on the East coast of UK.
Pipelay barge Acergy Piper has now laid about 400 km of the Northern section of Langeled, and with the help of Solitaire, the whole pipeline will be completed this fall. These days Solitaire is completing the installation of the pipelines from Nyhamna to the Storegga slide area, and S7000 is completing the deepwater installation part.
At Nyhamna, the main activity is installation of the huge prefabricated racks and pipes, with about 3000 workers in full swing most of the time. The construction and installation of pipelines, pipes, cables and equipment will continue throughout 2006, while in 2007 the main task will be to test out the equipment, before starting production in the autumn.
With gas reserves close to 400 billion cubic meters and development costs of about NOK 66 billion (USD 10 billion), the Ormen Lange field ranks as the largest development in the European offshore arena.
The two first remotely controlled subsea production stations are installed located 120 km from shore at 850 meters water depths – making Ormen Lange one of the world's largest and most advanced subsea to shore development.
From these stations, two 30-inch pipelines will transport the well stream to the onshore plant at Nyhamna at the coast of Mid-Norway for processing. The pipelines are laid across extreme irregular seabed with boulders and slide blocks up to 60 meters heights in the Storegga slide.
Furthermore, the pipelines are crossing the slide with an inclination up to 40 degrees. Nexan's Spider – a newly developed, remote-controlled excavator – has been preparing the seabed for the passage of the pipelines over steep slopes and very uneven terrain far below the surface of the sea.
The special water current condition gives water temperatures as low as minus 1 Celsius. Such extreme temperature conditions combined with high pressure can cause gas and water to form hydrates and ice, which again can form plugs in the pipelines. The subsea system has been designed to avoid hydrates.
When production from the Ormen Lange field starts in fall 2007, some 70 million cubic meters of gas, a volume comparable to Norway's entire daily energy consumption, will flow through the Langeled pipeline.
Facts about Hydro, Ormen Lange and the Langeled project
Most Popular Articles
From the Career Center
Jobs that may interest you