In order to satisfy their need in energy and / or to valorize their underground, the countries entrust the oil Companies to prospect and produce their hydro carbure.Depending on the size of reservoir, fluid, severity of the sea conditions, and water depth plus or minus complicated and large infrastructure have to be installed.The exploitation of huge North Sea hydrocarbon field started in the seventies. These first conventional reservoir fields have now reached their end of production and their decommissioning processus has started.
The first big field decommissionned in North Sea and in the world too was Frigg operated by TOTAL Norge
This course on Industrial site restitutution / Decommissioning is mainly based on Frigg Field and its associated pipelines. It introduces as well the current main decom events in the North sea on Ekofisk field operated by Connoco and Statfjord operated by Statoil and finally it introduces the anticipation for the future site restitutions of unconventional reservoir field as bituminous sand.
The summary of the course is:
-The decommissioning market
-Frigg
-Ekofisk
-Statfjord
-Others
-Frigg Field decom project
-Frigg field presentation
-Relationship with Authorities and NGO (Non gouvernmental Organisations)
-Rules and codes
-Infrastructure data base presentation
-Contractual and planning approach
-Export lines by-pass: challenge, method and means
-Wells abandonment and securisation
-Cleaning and disconnection of the different modules
-GBS (gravity based structure) External steel removal
-Infrastructure removal and transport to the onshore deconstruction site: challenge, method and means
-In Field pipeline removal: challenge, method and means
-Onshore deconstruction site: challenge, method and waste management
-Site restitution to marine traffic and fishing activities
-Project safety aspect due to the congested area, the number of lifts, the age of the structure (corrosion), the changing working site environment.
-Logistic, quality and impact on environment aspect
-Realized technical Innovation to allow for operation to be possible
Challenges and means for the futur field decommissioning