Intervention Campaigns

The provision of high calibre personnel with the right skills, experience and behaviours can make a vast difference to the safety and cost-effectiveness of subsea intervention campaigns, as can prudent onshore management. This applies not only to the execution phase itself but to the ability to provide a response to operational emergencies. We understand the desire to minimise both execution costs and production downtime. An understanding of the client’s business criticality and of managing multiple interfaces is key to the successful delivery of offshore campaigns.

Some examples of our experience in the engineering and management of subsea intervention campaigns include the following:

• Following the severing of an operational subsea control umbilical, senior operations support was provided to the client in response to the incident. A team of engineers was formed to develop operational workscopes to (1) make safe and stabilise the site; (2) reconfigure the remaining subsea architecture to reinstate control functions and restore production. The work included supporting the client in all regulatory matters such as PON notifications, DepCons, PWA amendments, etc. A scope of work was also prepared for recovery and disposal of the severed section of umbilical.
• Secondment to mid-sized operator as campaign manager for the 2013 air diving project. The purpose of the campaign was to perform critical inspection and repair work on several open drains and firepump caissons on three platforms. This included the installation of restraints between topsides and subsea on the poorest-condition caissons. The construction work was a complex combination of diver, ROV and topsides RAT. The use of an ad-hoc MPSV with air diving spread (rather than a dedicated DSV) presented a number of challenges to the successful completion of the campaign. The offshore execution phase lasted 106 days and was executed LTI-free.
• Overall management and coordination of multiple IRM DSV campaigns for various clients in UKCS. Typically this would include definition of the required work, provision of technical outline workscopes to diving contractors, coordination of the development of operational procedures, and liaison with client and third parties with respect to changing vessel schedule and work priorities. Would also provide technical input to environmental permits and consents (PON15, DepCon, PWA amendment) applications, and ensure correct reporting of same as part of work close-out.