Less than one year has passed since hydrocarbons were proven during exploration drilling in the Yttergryta prospect. Now the plan for development and operation (PDO) has been approved by the authorities.
"We are proud to have obtained approval of Yttergryta in such a short time," says Hege Marie Norheim, head of reserve replacement and business development in the Exploration & Production Norway business area.
"Yttergryta is a good example of how to apply subsurface knowledge, known technology and existing infrastructure in order to maximise the potential on the Norwegian continental shelf," says Ms. Norheim.
Early start of development
"This was a very fast process," says project manager Helge W. Albertsen.
Already before the exploration well was drilled, the first part of the subsea production facility was installed on the seabed. The reason is the high discovery potential of the Yttergryta prospect and it was therefore important to start production as soon as possible. The gas from the field contains very little carbon dioxide and will help maintain the production flow to the Aasgard B platform.
Both pressure and temperature are about the same throughout the whole area, and the technology used is a familiar standard solution. Development could therefore start before the discovery was confirmed.
"If no discovery had been made in Yttergryta, the equipment could have been used for a different project in the same area," explains Mr. Albertsen.
Used as mixing gas
Yttergryta is being developed with a simple subsea production facility on the seabed and a pipeline tied back to the Asgard B platform.
Start-up is scheduled for the second quarter of 2009, and the production period will be three to five years. Daily production capacity will be 3.5 million standard cubic meters (Sm3), but will be regulated by the demand on Asgard B. The gas from Yttergryta will be used as a mixing gas for the gas from Smørbukk, which has higher carbon dioxide content.
Development costs will total around NOK 1.2 billion, including drilling expenses.
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