Offshore conductor removal Offshore oil and gas platforms contain multiple conductors that run from the topsides down to the seabed. To allow decommissioning of the large jackets that support the topsides, the conductors need to be removed first. This has to do with (1) the dry weight of the jacket that may exceed the lifting capacity of the crane but (2) also with the poor structural integrity of conductors. Conductors consist of multiple concentric pipes for transport of oil or gas and production improving means. Their structural integrity is poor due to the long exposure in an offshore environment and outstanding maintenance. As a result, the removal of conductors is a labour-intensive and risky operation that requires extra care for personnel safety and the integrity of the structure below the conductors that may get damaged by dropped objects. The various conductor guide frames that are placed on several elevations for sideways support of the conductors make the removal of conductor sections even more challenging.

This case study explores the full operational procedure including tooling to safely remove conductors from a decommissioning jacket. Students will analyze the the boundary conditions and limitations but also opportunities and innovative tooling.