StatoilHydro has received consent from the Petroleum Safety Authority Norway to use the semisub Transocean Arctic for well clean-up on the Tyrihans field.
In January 2008, StatoilHydro received consent to use Transocean Arctic for drilling and completion of 11 injection and production wells on Tyrihans. Well clean-up had not been mentioned in the application for consent. The company therefore submitted an additional application for consent to conduct well-clean-up of 11 wells. Consent was granted on Dec. 16, 2008.
Located on Haltenbanken in the Norwegian Sea, the Tyrihans field is situated on Norwegian Blocks 6406/3 and 6407/1 in water measuring 886 feet (270 meters). StatoilHydro is the operator of the field and owns 58.8% interest; Total owns 26.51%; Eni owns 7.95; and ExxonMobil owns 6.75%.
With development costs totaling US $1.8 billion (NOK 12.8 billion), Tyrihan is considered to be the largest oil and gas field discovered offshore Norway. The field's reservoir, about 11,486 feet (3,500 meters) deep in the Garn formation, holds estimated recoverable resources of 811 MMbo and 1.24 Tcf (35 Bcm) of gas.
Tyrihans is expected to commence production in 2009 and has a life expectancy of 16 years. The field is expected to reach a plateau production of 459 MMcf/d (13 MMcm/d) of gas and a plateau production for liquid at 459,091 cf/d (13,000 cm/d).
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