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The process of well decommissioning is an inevitable part of the oil and gas lifecycle. As the UK Continental Shelf enters a period of intense decommissioning activity, an increased number of suspended and shut-in wells will require continuous integrity monitoring to ensure environmental safety.

Recognising that it can be difficult to monitor suspended or shut-in wells both efficiently and cost-effectively, Sentinel Subsea has created a passive monitoring system that addresses the critical need to lower the cost of well plugging and abandonment (P&A), whilst ensuring ongoing emission reduction targets are met and maintained in the long term.


The only one of its kind, our well monitoring system is designed to:

Reduce Operating Cost. The system de-risks suspended and shut-in wells meeting optimum subsea asset inspection requirements, whilst eliminating the need for manual inspection.

Enhance Risk Management Processes. Operators who use our passive monitoring system will have “peace of mind”, as the system provides a constant and real-time assurance that all well barriers are secure. This “early alert” means should there be a loss of zonal isolation it can be dealt with immediately.

Promote Environmental Stewardship. Our technology assures continual environmental integrity to the operator and regulatory communities. The in-situ system also reduces carbon emissions created via manual inspection methods.



Central to our solution is SWIFT (Sentinel Well Integrity Fluid Tracer). Developed by our technology team, this environmentally-friendly fluid tracer is sealed in the well during the suspension or decommissioning process.

If zonal isolation is subsequently compromised, the passive interaction between SWIFT and our patent applied for monitoring system (Frond) creates an alert, allowing well owners to investigate immediately.

  • Environmentally Friendly. We repurpose material from the fish processing industry, which would normally go to landfill, and couple it with chemicals derived entirely from biomass.
  • No Added Risk. The deployment of SWIFT and our monitoring system has been developed to align with standard well P&A procedures and practice.
  • Passive. The system requires no active power and is only turned on when the beacon within the mudline monitoring system is released to the surface. The system has an extended life cycle of 15 years with no need for intervention.
  • Low-Cost. The Sentinel Subsea solution can give operators multiple cost-savings when compared against traditional integrity monitoring systems.
  • Non-Invasive. SWIFT does not disturb any other materials found in the well or reservoir.
UK DECOM SPEND £bn by 2027
Well P&A - % UK activity by 2027
Wells in UKCS


Neil Gordon

Neil Gordon

Chief Executive Officer

Neil demonstrates an impressive track record within the oil and energy sector. Over 34 years in well construction have seen Neil play an integral role within a number of global companies, bringing his expertise to a broad range of operations, sales, senior management and board level activity. Neil has managed global product line portfolios whilst successfully championing and launching new and innovative well construction technologies.

As CEO of Sentinel Subsea, Neil is now working hard to help the oil and gas industry demonstrate good environmental stewardship via the decommissioning process, and beyond.

+44 (0)7493-137788


Andrew Jaffrey

Dr Andrew Jaffrey

Chief Technology Officer

Andrew brings over 30 years of wide-ranging experience to the role. His career spans a variety of innovation/technical directorship and consultancy roles, including 23 years in oil and gas, with the last 13 years focused on subsea.

He is a Chartered Engineer and Fellow of the Institution of Engineering & Technology with extensive experience in the global delivery of multi-million dollar physical and digital solutions. His creative desire to find pragmatic solutions to industry issues is reflected in being a named inventor on 24 granted patents, with another 12 patents pending.

+44 (0)7824-636022


Elliot Kinch

Elliot Kinch

Business Development Director

Elliot is Sentinel Subsea’s Director of Business Development. A well intervention and completion specialist with over 25 years’ industry experience, he has dedicated over 10 years to the offshore deployment of well intervention, conventional and intelligent completion technology product lines.

His project management of the design and deployment of these technologies in many international regions gives him valuable connections, knowledge and understanding of the subsea arena and specifically the challenges faced by the industry, tasked with effective well plugging and abandonment.

+44 (0)7739-355351



Jim Gordon

Business Development

Jim is a recent graduate of the University of Aberdeen. With an MSc in International Business Management, he has brought a raft of knowledge which he is now applying to his business development role at Sentinel Subsea. With particular expertise in market research and analytics, Jim identifies markets, growth areas, trends and customer profiles and relishes the fast paced start-up environment of Sentinel Subsea.

A native Aberdonian, Jim spent time studying overseas before returning to Scotland, where higher education was mixed with team management roles during his five years as a student.

+44 (0)7587-978773



“…the value this technology will bring is multi-faceted. It negates the need for annual or biannual inspections - an important contribution to lowering costs. Operators have the confidence to deploy some of the alternative abandonment technologies, knowing that should there be an issue it would be caught early, and remediation would be simpler and cheaper.”― The Oil & Gas Technology Centre


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Field Trial Complete

Sentinel Subsea Completes First Offshore Field Trial

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Scottish EDGE Round 14 winners! Sentinel Subsea receives coveted award in top 2% of the 289 companies that applied and pitched their way through the video round, semi-final and final.

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Sentinel Subsea wins a place on OGTC TechX Pioneer Programme.

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On the BEEB

Read the BBC News article about the great work done for Sentinel Subsea by Prof. David Bucknall and his talented team at Heriot Watt University.