An oil field located about 80km west of the African coast at the water depth of 818m had reached its endof economic life.The facilities and wells would need to be decommissioned and abandoned(D&A).TheFloating Production Storage & Offloading(FPSO),which was the key component of the facilities,wouldneed to undergo the disconnection and demobilization(D&D)phase.The objective of this campaign wasto restore the field back to its safe condition whilst minimising the environmental impact,complying withlocal and international legislative.The abandonment & decommissioning works was performed in line withgood industry decommissioning practices at the most optimize cost.Upon completion of the D&D,theFPSO would need to be demobilised to her original base in the South East Asia(SEA).This paper discusses a case study for a D&D campaign and activities of the FPSO which includes theSubsea,Umbilical,Riser and Flowline(SURF)and mooring system.One of the crucial areas during theexecution phase was pertinent to the management and disposal of the hazardous waste that is subjectedto transboundary movement as per the relevant convention.Amongst the hazardous waste were NaturalRadioactive Occurrence Material(NORM),low specific activity(LSA)material,hydrocarbon sludge andcontaminated water.The FPSO need to be cleared from the above said hazardous waste for her to be acceptedby the receiving base country.This paper also describes the actual experiences and lessons learnt which can be applied for futureprojects.
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