Ocean Prediction Networking Final Seminar 12.05.2011 Metocean Metocean at Statoil Ocean Prediction Networking Final Seminar 12.05.2011 Kenneth Eik

www.statoil.com

Need for metocean information Design basis for marine structures – extreme values and fatigue Floating and fixed structures Pipelines and subsurface structures Land terminals Basis for evaluation of marine operations Reliable weather and ocean forecasts Data as input to EIA studies (i.e. oil drift) Design- and energy basis for offshore renewable energy Huldra jacket Alt som skal bygges offshore og på land har behov for design verdier for vær. Bølger har normalt vært den viktigste designparameteren i Nordsjøen. Denne benytte blant annet til å beregne dekkshøyde. På dypere vann kan strøm være viktigere enn bølger i design. Mindre og mer marginale utbygginger setter store krav til kvaliteten på værdata. Rørledninger har behov for strømdata for stabilitetsvurderinger og for utmattingsberegninger. De aller fleste operasjoner offshore og på land har operasjonelle værbegrensninger. Værsensitive operasjoner setter stor krav til pålitelig værmelding Det er behov for værdata til alle typer miljøstudier, for eksempel oljedrift. Energiproduksjon for vindmøller går som tredje potes av vinden. Relativt så feil i vindestimatene vil gi relativt større feil i produksjonen. Eksempelvis vil 10% feil i vindestimatet føre til ca 30% feil i energiproduksjonen. Det er behov for bølgedata til potensielle bølgekraftverk og strømdata til potensielle tidevannskraftverk (som i Kvalsundet i Finnkmark) Tidal plant in Kvalsundet

Tasks – data collection and analyses Wind and waves Currents and water level Sera ice, icebergs, waves in ice/ice in waves Oceanographic parameters Temperature, salinity, density, oxygen, etc Marine growth Meteorological parameters Temperature, precipitation, humidity, icing, wind chill, etc. Always a need to provide data (own initiative or as JIPs) Measurement campaigns Hindcast studies Data purchase Modelling Icing at Melkøya January 2006

Who ? Einar Nygaard – Oceanographer - UiB Børge Kvingedal – Meteorologist - UiB Kjersti Bruserud – Oceanographer –UiB Odd Jan Andersen – Meteorologist – UiB Kenneth J. Eik – Civil Engineer Marin Technology – NTNU Richard Gaches – Oceanographer- UK Sverre Haver - Civil Engineer Marin Technology – NTNU Martin Mathiesen - POLYTEC

Operations needing current forecasts Seismic surveys Oil spill drift Operations in ice Rig moves

What are the requirements to current forecasts Not totally wrong! Direction forecasted 90° compared with real direction or worse Magnitude more than 200% or less than 50% compared to real magnitude Need to capture severe and extreme events! Today most Statoil operations are performed without current forecasts The skills of oceanographic models need to be documented and communicated!

LOfoten and VEsterålen CURrents (LOVECUR)

Real-time current data

Arctic operations

Conclusions Oceanographic models are needed in a wide range of offshore operations Hindcast Forecasts The quality of oceanographic models need to be known! Studies performed by the offshore industry so far shows that further developments are needed in a number of ocean basins. Access to good ice-ocean models even more important in the future Statoil may provide real time current measurements on request.