The oil and gas field will be developed with five subsea templates, including one for seawater injection, and with wellstream processing on Statoil's Kristin platform. Tyrihans is scheduled to come on stream in 2009, when spare capacity will be available on the Kristin installation.
"This field calls for extensive technology development, but the work still needing to be done is felt to be at an acceptable level," says Ståle Gjersvold, project manager for Tyrihans.
Pressure support will be ensured by injecting gas from Statoil's Åsgard development to supplement the template dedicated to seawater injection.
"Extensive use will be made of multilateral wells," explains Mr. Gjersvold. "We'll also be advancing our smart well technology to improve recovery from subsea-developed fields."
Gas from Tyrihans will be exported via Kristin and the Åsgard Transport trunkline to Kårstø north of Stavanger, while oil and condensate are stored on the Åsgard C vessel for export by ship. Tyrihans is expected to yield recoverable reserves of about 182 million barrels (29 million cubic meters) of oil and condensate and 34.8 billion cubic meters of rich gas.
Total development costs are estimated to be just under NOK 14 billion (nominal).
The Tyrihans templates will lie in roughly 300 meters of water about 35 kilometers south-east of the Kristin platform.
A 43-kilometer pipeline linking these structures with Kristin will be electrically heated to inhibit the formation of hydrate (a kind of hydrocarbon ice).
The PDO envisages a total of 12 wells, including nine for production, two for gas injection and one for injecting unprocessed seawater.
"This project combines all our knowledge and innovative technology for improved recovery from subsea-developed fields," says Mr. Gjersvold.
"It will set a new standard from bringing such developments on stream."
The Transocean-owned Transocean Arctic rig has been chartered for drilling and completion work.
Tyrihans will be operated by the Kristin operations organisation at Statoil's Stjørdal offices near Trondheim in mid-Norway.
Statoil has a 46.8 percent holding in the field. Its partners are Total with 26.51 percent, Norsk Hydro 12 percent, Eni Norge 7.9 percent and ExxonMobil 6.75 percent.
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