TMR4225 MARINE OPERATIONS SPRING 2007 Introduction.

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Presentation transcript:

TMR4225 MARINE OPERATIONS SPRING 2007 Introduction

Marine operations Key features Limited duration Transient condition. May be interrupted Do not need to design for extreme conditions Weather dependence

Examples on marine operations (DNV) Load Out: Transfer a structure from land onto a vessel Float Out: Transfer a structure from a dry construction site to a self floating condition. Float on / Float off: Transfer a floating structure onto a vessel and vice versa. Towing: Pushing / pulling by tugs. Self propelled carrier transports: Transport on deck of a self-propelled vessel Launching: Cutting seafastening of a structure and slide down launch rails to a free floating condition. Upending: Upend a floating structure. Positioning: Position a structure a predetermined location Setting: Set down a structure, levelling and soil penetration. Pipelaying: Laying pipe on the seafloor.

Examples on marine operations (DNV) Piling: Secure a structure to sea bottom by driving piles into the soil. Offshore loading: Loading e.g. oil from one vessel to an other. Grouting: Cementing piles after pile driving or injection of cement to level foundation. Lifting: Lift or support a structure by crane. Lift off: Transfer a structure from a temporary construction site onto a transportation vessel. Mating: Join two floating structures. ROV /AUV operations: Work on subsea equipment, surveillance, bottom mapping. Etc....

Practical experience versus physical insight. Engineering approach Understand physics of system Quantification by simple methods Detailed analysis Advanced numerical tools Experimental approach

Classical offshore structure. Challenges w.r.t Installation Operation Repair / maintenance Removal

History of jackets

Jacket installation, self-floater

Jacket installation, launching & crane assistance

Gravity base structure, Condeep

Jackup & jacket

Semisubmersible

Floating production

Semisubmersible craneship

Offshore loading buoy

Offshore loading

Offshore wind turbines

Examples – deep water ST A V ANGER BERGEN OSLO KRISTIANSUND TRONDHEIM STURE HAMMERFEST HARST AD

Example: Ormen Lange Approx. 21 KM TO TOP OF SLIDE EDGE TO SHORE TOP OF SLIDE EDGE WATER DEPTH = 250 m TOP OF SLIDE EDGE WATER DEPTH = 250 m N DEVELOPMENT AREA WATER DEPTH = 850-900 m EXPORT LINES: 2 x 30” 2 x 6” MEG 3” Service Control Umb. DEVELOPMENT AREA WATER DEPTH = 850 m INFIELD FLOWLINES: 2 x 12” 2 x 4,5” MEG SU (2”) 10 KM

World wide deep water locations

Wave conditions

Pipelaying, Semisubmersible LB200 Fra OLF nyhet 12.11.2005: Etter mer enn tolv timer i drift i høy sjø, ble rørleggingslekteren «LB200» endelig festet til slepebåtene igjen lørdag kveld. Rederiet Stolt Offshore bekreftet klokka 20 at to slepebåter hadde lyktes med å feste slepetau til kolossen, som har vært i arbeid ute i Norskehavet. Lenge fryktet man at lekteren ville støte inn i en av de mange riggene i området, og flere plattformer ble delvis evakuert. Evakueringen av de fleste om bord i «LB200» også ble fullført, til tross for at arbeidet med å feste slepetauene til slutt lyktes. Det er fortsatt usikkert når situasjonen vil være fullstendig under kontroll, for det blåser kraftig der ute, sa pressesjef Anders Bang-Andersen sent lørdag kveld. Fikk hjelp Arbeidet med å få i gang slepet var tungt fordi sjøen var så grov. Bølgehøyden var en stund oppe i 8 meter, men utpå lørdagskvelden hadde den minket til 5-6 meter, opplyste pressetalskvinne Birgit Sildnes ved Hovedredningssentralen Sør-Norge (HRS) til NTB. En ekstra slepebåt ble hyret inn fra Balder-feltet for å hjelpe til med å få i gang slepet igjen. To taubåter lå hele tiden ved siden av lekteren, mens en båt fra Aberdeen og en fra Oseberg-feltet også satte kurs for fartøyet. Fryktet krasj Rørleggingsfartøyet var under slep til Bergen da de to slepelinene om bord løsnet lørdag morgen. Evakueringen ble iverksatt fordi man fryktet at lekteren kunne treffe en av oljeriggene i området.

S-laying and J-laying

Replacement of flexible risers

Simulation of lifting operations

Marine operations - challenges Deep water More subsea equipment Requirements on costs and regularity Harsh environment Needed: people with knowledge about Dynamics System modelling Statistics Current practice