"A growing number of oil and gas assets have either reached, or are approaching, the end of their economic lifespans, and, in accordance with current regulations, will have to be decommissioned and removed. This presents challenges for the owners and operators of these assets, but offers major business opportunities for engineering consultants, contractors and service specialists. [...] At the moment, there are three accepted strategies for the removal of these larger production facilities, namely piece small, reverse installation and single lift. [...] Until recently, decommissioning has not been considered within the overall lifecycle of an offshore asset. As a result, maintenance regimes have often overlooked key items of plant and equipment that would be needed during the abandonment stages, leading to significant and arguably unnecessary costs. There are welcome signs that this attitude may be changing, with some companies now introducing decommissioning as part of their graduate development programmes. However, further effort is required before decommissioning is fully considered throughout the lifecycle."And to give you a sense of the scale of what it takes to remove such rigs, here's a NatGeo docu on assembling one of the very biggest! And Discovery docu on North Sea Mega Rigs!
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