Decommissioning Conference 2007, Esbjerg, Denmark Project and research activities revisited related to Offshore Technology at Esbjerg Institute of Technology, AAU
Presentation Jens Peter Thomsen Environmental Technology Esbjerg Institute of Technology Aalborg University Denmark Anders Schmidt Kristensen Computational Mechanics Esbjerg Institute of Technology Aalborg University Denmark
Outline Part 1: Anders Kristensen Introduction Decommissioning of offshore platforms structural and mechanical analysis Part 2: Jens Peter Thomsen Decommissioning of offshore platforms - environmental impacts
Introduction Esbjerg Institute of Technology History Organisation Research activities Areas of interest Decommissioning Drilling jar systems Educational activities Diploma, Bachelor, Master, Ph.D., Post. Doc Projects
Presentation Aalborg University (AAU) Inaugurated in 1974 App. 12.000 students Budget of 900 mill. Dkr. AAU Esbjerg (AAUE) Part of AAU in 1995 App. 116 employees App. 400 students
Research activities Oil & Gas Techn. Environmental Techn. And management RESEARCH IN ESBJERG COMPUTER SCIENCE GROUP CHEMICAL ENGINEERING GROUP Production simulation COMPUTIONAL MECHANICS GROUP CAD and FEM Multi-body systems CFD analysis Offshore systems Material techn.
Research contacts COMPUTER SCIENCE GROUP David Hicks http:///cs/dk /cs/dk/ CHEMICAL ENGINEERING GROUP CFD analysis and offshore systems: Bjørn Hjertager http:///kemi/uk /kemi/uk/ Material technology: Birgit Kjærside Storm (Aluminium and Plasts) http:///kemi/uk /kemi/uk/ Environmental technology and management: Jens Peter Thomsen http:///kemi/uk /kemi/uk/
Research activities COMPUTIONAL MECHANICS GROUP Prof. Lars Damkilde Civil engineering, advanced simulation FEM, CFD offshore structural analysis Asc.. Prof. John Wægter Structural analysis, dynamics, fatigue, norms - offshore structural analysis Asc.. Prof. Anders Kristensen Mechanical engineering, machine design CAD, CAE, MBS Oil&Gas,, offshore structural analysis Asc.. Prof. Sven Krabbenhøft Civil engineering, geotechnical analysis, testing/measuring
Educational activities Mechanical engineering Bachelor programme Master programme COMPUTIONAL MECHANICS GROUP Research based Oil and Gas Master programme Civil engineering Bachelor programme Master programme Unique in Denmark
Educational activities Bachelor programme Mechanical engineering Master programme Focus on implementation of technology Focus on industry involvement Focus on application of advanced numerical methods (CFD, FEM) Unique in Denmark
Examples Decommissioning structural analysis of barges, load carrying structures Modelling of structural effects caused by explosive blasts Modelling of dents in offshore platforms Modelling of wave effects on offshore systems Modelling of drill pipes and jar connections Design of down-hole equipment Development of wave simulation software Transport and treatment of crude oil Modelling of Tapping Tee systems Modelling of jacket platforms and tubular joints Modelling of wave energy systems
Examples
Examples
Examples
Strumming/Vortex Shedding Vibrerende kabel Udmattelseszone
CFD-modellering
Decommissioning of offshore platforms - environmental impacts Environmental Impact assessment (EIA) / Ecological Risk Assessment (ERA)
Ecological Risk Assessment (ERA) Retrospective ERA: Evaluation of a discharge from an existing activity. Predictive ERA: Prediction and evaluation of the effects of chemicals on ecosystems in specific environmental management situations.
Ecological Risk Assessment (ERA) Problem identification, Hazard definition. Exposure Characterization. Ecological effects assessment. Risk characterization. Risk management. Ecological monitoring.
Decommissioning elements 1. Cleaning activities before decommissioning. 2. Dismantling the installation and handling on site. 3. Transport of the dismantled platform. 4. Scraping activities in the harbour area.
Environmentally Sustainable Offshore Decommissioning Activities
Results and findings Some components used at the oil platform/in connection with drilling. (Cecilia Esonge Thesis) BaSO 4 Emulsifiers Sodium and calcium chloride Amine treated bentonite clay Sodium sulphite Ammonium bisulphite Zinc carbonate Lime Biocides Heavy metals Anti-foam Oxygen scavenger Hypochlorite Scale inhibitors Corrosion inhibitors Asphaltene Hydrogen sulphide Water clarifiers Wax inhibitors Tri ethylene glycol Mono ethylene glycol Strontium Asbestos Freon Halogon Ammonia
Ecological effects assessment Source Environmental distribution/transformation Biological uptake Organism response Population response Community response Ecosystem response
Ecological effects assessment Endpoints: LC 50 EC 50 NOEC (No observed effect concentration). LOEC (Lowest observed effect concentration)
Ecotoxicology tests used at AAUE Acartia tonsa (Marine crustacean, acute toxicity LC 50 ) Sceletonema costatum (Marine phytoplankton, growth test EC 50 ) Vibrio fishery (Marine bioluminescent bacteria growth test EC 50 )
Results WAF (Water Accomodated Fraction of Crude oil). Highest % effect: 6% Lowest % effect: -40%