Holstein Production District comprises both the Dieksand Land Station and the Mittelplate Drilling and Production Island. The district is located at Friedrichskoog on the North Sea coast in the western part of Schleswig-Holstein, 120 kilometres northwest of Hamburg and not far from where the River Elbe flows into the North Sea.
Mittelplate is Germany’s biggest oil field
Around 90 employees of Holstein Production District have been coordinating the safe and sustainable production of oil from the Mittelplate field, Germany’s largest and most productive oil field, since 1987. Since the first well went on stream that year, around 30 million tonnes of oil have been produced from this field, with a further 20-25 million tonnes of oil still considered to be recoverable.
Mittelplate Drilling and Production Island is situated seven kilometres west of the coast on the southern fringes of Schleswig-Holstein’s Wadden Sea National Park. Since 2005 the oil produced from this field has been piped straight to Dieksand Land Station. Since 2000 we have been developing the field not just from the artificial island, but also from Dieksand: with a reach of more than nine kilometres, highly deviated horizontal wells extend from the land out into the eastern flank of the reservoir. These are among the world’s longest extended reach wells. The Dieksand 6 well reaches 9,275 metres into the oil-bearing Dogger sandstone layers at a depth of around 2,000 metres, and is Germany’s longest well.
Dieksand: both production and processing
One of the main tasks of the Dieksand Land Station is the processing of the oil produced. State-of-the-art facilities are available for this: the oil is first separated from the gas and water in horizontal vessels. It is then further treated in four flat-bottomed tanks, each with a capacity of 2,500 m³. The oil is piped in field lines to Brunsbüttel from here.
The produced gas is fed into compressors, which pump the gas under pressure into a dehydration plant and from there, via a pipeline, to Brunsbüttel. The separated condensate is also pumped via a separate pipeline. All tanks that are not double-walled are mounted in concrete collection basins. The entire facility has been designed to comply with all the relevant watercourse regulations to prevent groundwater contamination.
Strict safety precautions for crude oil processing
Strict safety precautions and environmental protection measures also apply in the operation of the oil-processing facilities. A process control system monitors all the production and operational facilities and automatically closes them all down in the event of any malfunction. Multiple safeguards ensure that if one system breaks down, another automatically takes over. The construction concept implemented at the 55,000 m² Dieksand site is geared entirely at minimising the impact of these operations on the environment and the natural habitat. All work has run smoothly and trouble-free since Dieksand Land Station began operation.