Patent ID: 8070388
Filing Date: 2011-12-06
Classification: B63B,E02B

Abstract:
1. A structure for decommissioning and transporting an offshore fixed oil production platform formed by a deck and at least one supporting column, said structure comprising: a U-shaped floating hull positioned around the offshore fixed oil production platform and fitted with lifting legs configured to rest on the seabed, each lifting leg supporting a mechanical displacement apparatus housed in a bearing framework of said hull; a shuttle configured to be moved and positioned along the lifting legs and configured to move one of the deck and the at least one supporting column of the production platform, said shuttle comprising elements, each element provided for a respective lifting leg of the lifting legs; and each element comprising a mechanical drive positioned on the respective lifting leg and configured to drive the respective element independently of remaining elements of the shuttle on the other legs, and each element further comprising a respective connecting apparatus including a traction device configured to connect with the deck or the at least one supporting column of the offshore fixed oil production platform, wherein each respective element of the shuttle on each leg is separated from and free of direct physical contact with any other of the elements of the shuttle on another leg, wherein the connecting apparatus comprises for each element of the shuttle a first locking assembly supported by the element and a second locking assembly supported by the hull, the first and second locking assemblies configured to lock and release the traction device successively so as to cause vertical displacement of the supporting column.