Page 70: of Offshore Engineer Magazine (Mar/Apr 2026)

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TECH FEATURE DECOMMISSIONING ortfolio economics, regulatory requirements Downhole unknowns, historic well data gaps, legacy and ageing infrastructure will continue to completion designs and varying levels of degradation can drive well decommissioning activity for years all create challenges when preparing wells for plug and

P to come. According to Offshore Energies UK, abandonment and verifying permanent well barriers.

well decommissioning is forecast to account for 47% of But well decommissioning is not limited to ageing in- overall decommissioning expenditure between 2025 and frastructure alone. Increasingly, wells are also being re- 2034, and the UK Continental Shelf’s cumulative cost tired where production is no longer economically viable, estimate has increased by £1 billion since 2023 and is where feld redevelopment offers greater long-term value, expected to reach £12 billion by 2032 . or where regulatory and policy considerations infuence

However, the scale of this activity highlights a wider operational decisions.

point. Well decommissioning is about far more than ful- Each scenario introduces technical challenges, from un- flling regulatory requirements or deploying established derstanding historic well design and casing confgurations technologies. to ensuring permanent barriers meet modern standards.

Crucially, the next phase of activity represents a new Operators and contractors must therefore navigate a arena for engineering and logistics. Delivering safe and range of considerations including safety, structural in- effcient P&A programmes requires technical precision, tegrity, project complexity, fnancial and personnel con- operational experience and sustained investment — all straints, emissions targets and evolving timelines.

underpinned by rigorous safety standards. At the same time, emerging technologies are playing an important role in helping the industry address these chal-

Scenario Planning lenges. Field redevelopments, extended asset lifetimes

Growth in well decommissioning is being driven pri- and low-carbon initiatives such as carbon capture and marily by mature basins, led by the North Sea but also storage all depend on safe, verifed well barrier solutions.

including the Gulf of Mexico and parts of Asia-Pacifc. Meanwhile, contracting models are increasingly shift-

Many wells in these regions were drilled several de- ing toward integrated approaches, with operators often cades ago. Over time, numerous assets have been granted adopting EPC-style frameworks for end-of-life projects. lifetime extensions beyond their original design param- This trend further emphasises the importance of techni- eters, introducing additional complexity when planning cal expertise and close collaboration between operators, well decommissioning programmes. contractors and specialist service providers.

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