Multi-PSL team delivers P&A project with 19 subsea wellsDownload PDF
Provide plug and abandonment (P&A) services for multiple subsea wells
A major operator in the UK Central North Sea awarded Halliburton a multi-service performance contract to provide plug and abandonment (P&A) services for multiple subsea wells. At the time, this was the largest P&A campaign of subsea wells ever attempted over multiple mature fields located in the Central North Sea area. Halliburton was contracted to provide project-management integration, both onshore and offshore, including cementing materials, fluids, integrated cased-hole services (slickline and e-line), tubing-conveyed perforating, plug and packer products, a well-testing bleed-off package, and mud-logging services for well monitoring.
The risks associated with conducting subsea well P&A operations are considered to be among the most challenging to undertake. The 19 wells for this project were split over 10 various batch locations all across the Central North Sea area.
The logistical challenges of the subsea environment, along with the inability to easily move between the wells should there be any unexpected downhole conditions, were significant challenges to overcome in order to conduct safe and efficient phased P&A operations.
In addition, a variety of contingency equipment for multiple potential scenarios was required to be available to the operations while performing interventions to subsea wells hundreds of feet below sea level.
The well portfolio varied in complexity, and included:
Halliburton Project Management addressed these challenges, and put together a team of experts from multiple Halliburton product service lines (PSLs) for both the planning and operational phases.
Completion for one of the largest subsea P&A campaigns
Subsea wells serviced
of the batches resulted in significant savings
Through the duration of the project, the Halliburton team performed P&A operations on a total of 19 wells. The Halliburton team’s operating performance was excellent throughout, providing significant savings on 50% of the batches, based on planned overall project timings. Additionally, the project team achieved the following:
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