As part of its scope, subsea specialist DeepOcean removed six subsea conductors and four vertical supports at varying water depths and removed the upper conductor guideframes with an estimated weight of 400 t, together with the design and installation of bespoke clamps.
The entire project was completed within 12 – 16 weeks from contract award to offshore execution. DeepOcean’s expedited engineering solutions ensured a safe project with zero lost time incidents (LTIs), to the satisfaction of Fairfield Energy.
“The project required intensive dynamic and structural analysis to enable the removal of the upper conductor guideframes. The scope also required significant shallow water ROV operations for the removal of the upper guideframe and conductors. With high-end subsea engineering involved, together with specialist subsea tools and technologies required to execute the project, coupled with our attention to high quality and safe project delivery, I would classify it as a flagship project for DeepOcean,” says Gary Scott, UK Commercial Manager & Legal Counsel at DeepOcean.
DeepOcean’s engineering, tooling, rigging design, engineered contingency options and spares packages, allowed DeepOcean to ensure weather downtime on the project was negligible throughout. This provided Fairfield Energy with necessary comfort that the scope would be completed within the summer of 2023, thereby avoiding the risk of loose conductors experiencing another winter period in field.
DeepOcean’s Aberdeen office was responsible for engineering and project management, with support from the company’s Haugesund and Stavanger offices in Norway. The offshore work was conducted from the hybrid-battery powered CSV Edda Freya.
Key subcontractors who assisted in delivering the scope of work include Claxton, Machtech and Global Energy Group.
“We were very pleased and impressed by DeepOcean’s ability to engineer and safely execute our large scope of work from a standing start in February 2023 to full offshore completion by early September. Quality personnel and effective communications were the defining characteristics of this very successful operation,” said Brian Brown, Supply Chain Manager at Fairfield Energy.
The Dunlin Alpha installation, located approximately 137 km northeast of Shetland and in a water depth of 151 m, produced its first oil in 1978. In the 37 years that followed, more than 522 million bbl of oil were recovered from the Greater Dunlin Area, comprising the Dunlin, Dunlin S/W, Osprey and Merlin fields. Fairfield Energy acquired the assets in 2008 and took over full operatorship in 2014, maximising production during its late-life stage and then progressing its subsequent decommissioning programmes.
Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/03102023/deepocean-completes-dunlin-alpha-decom-scope/