Jee’s engineers were contracted to work within a client’s decommissioning team on a range of operations on assets in the Southern North Sea. The operations took place over several years and covered a number of different phases.
As part of this work, we were contracted to provide management functions for the decommissioning of well head protection systems and subsea infrastructure. This covered the entire decommissioning process from desktop studies to offshore operations, including regulatory liaison to ensure all necessary documentation (such as decommissioning programmes, PWA variations and the derogation case to enable both buried and structurally unsound mattresses to be left in-situ) was produced, submitted and approved.
In addition, Jee also oversaw the development of novel technology to remove grout from the piles holding subsea structures in place, allowing them to be cut and the structure lifted, minimising diver intervention and seabed disturbance.
As part of a further decommissioning project in the area, Jee supplied project engineers to support pipeline decommissioning activities (including generation and submission of required regulatory documentation such as PWA variations) and participate in the development of the associated platform complex dismantling safety case for submission to the UK HSE.
We also provided experienced offshore representatives, responsible for supervising and coordinating operations including well isolations and interventions, barrier testing, corrosion inhibitor injections and pipeline cutting and removal across the field.