Offshore contractor Allseas has deployed its giant vessel Pioneering and new liner lifting technology for the first time to remove CNR International’s Ninian Northern liner from the northern North Sea and transport it intact to shore for recycling .
Weighing 8100 tons, the first commercial lift with Pioneering Spirit Jacket Lift System (JLS) is one of the heaviest offshore lifts ever built, but still falls well short of the system’s single-lift capacity of 20,000 tonnes, Allseas said in a statement on Friday.
Pioneering Spirit has arrived in the Ninian Field160 km northeast of the Shetland Islands, April 14. A week later, after final preparations and trimming of the legs, the eight-legged jacket was lifted out of the water and lowered onto the deck for transit. The eight-foot rig, a drilling and production facility, was installed in 1978 and began production in 1980. Production on the rig ceased in 2017.
The jacket has now been delivered to the Veolia-Peterson yard in Dales Voe, Shetlands. The facility is aiming for 98% steel reuse.
The lift concludes two years of planning and design, which began with the removal of the tops of the 14,200t Ninian Northern platform in a single lift by Pioneering Spirit in 2020.
“CNR International’s decision to select Pioneering Spirit for the removal of the Ninian Northern liner demonstrates the industry’s confidence in Allseas’ innovative engineering solutions and further reinforces our reputation as a leader in the global energy market. offshore. said the Chairman of Allseas, Edward Heerema.
As Allseas explains, fundamentally different from conventional crane-lift vessels, the stern-mounted system comprises two connected 170-meter-long beams that lift and support jackets of all sizes during dismantling and installation operations. . The system also allows ducts to be transported in a near vertical position to maintain structural integrity.
According to Allseas, this state-of-the-art technology enables the direct transfer of structures to and from the quay and eliminates the need for support barges. There is no need to tie the jacket to beams during transport due to the vessel’s high level of stability, significantly reducing time spent in the field and reducing carbon footprint.
“With the successful retirement of the Ninian Northern Jacket, Allseas has achieved its long-term vision of a vessel that provides the offshore industry with a total solution for working offshore”, added Heerema.
In a separate update on Friday, the Port of Lerwick in Scotland said the Ninian Northern production jacket had arrived at the Shetland deepwater port, delivered by Pioneering Spirit. It was the first time the world’s largest offshore construction vessel had operated alongside berth in a UK port.
According to Lerwick, Pioneering Spirit will initially lift the steel support structures onto a barge for removal and reuse, paving the way for jacket loading. The vessel will then sail under half sail to transfer the jacket via barge, Allseas’ Iron Lady, to the base in a complex multi-day operation. The structure will be loaded on a sturdy platform.
The jacket will be dismantled and recycled for approximately eight months by Veolia/Peterson.
Ninian Northern is the first of several major jacket removal and installation engagements for Pioneering Spirit in 2022. The vessel will lift and transport over 123,000 tonnes of structures for the offshore energy industry this year using at the both its motion-compensated Topsides jacket lift and lift systems. .
Earlier this year, the Pioneering Spirit installed the fifth and final rig on the Johan Sverdrup field in the North Sea for the Norwegian Equinor.
[The article has been updated to include a statement and a video from Lerwick Harbour.]