Subsea Drilling Riser Systems

Subsea drilling riser systems for jack-up well access

Our subsea drilling riser systems are engineered to enable safe, reliable well access from jack-up rigs using dry surface BOP operations. Designed for shallow-water subsea developments, they support both standard and high-pressure applications, providing a proven alternative to semi-submersibles while reducing cost, improving uptime, and protecting subsea assets through an integrated, analysis-led approach.

Aquaterra Energy's AQC-SR in use offshore

A complete subsea well access drilling riser system, from seabed to surface

We provide a fully integrated subsea drilling riser system that creates a structurally sound, pressure-retaining conduit between the subsea wellhead or tree and a surface drilling BOP. Our well access solution combines proven riser hardware, specialist rig integration, and comprehensive engineering analysis to ensure every interface, load path, and operating condition is optimised for offshore performance.

Designed to support both conventional and high-pressure drilling operations, the system enables dry surface BOP operation from jack-up rigs, reducing fatigue loading on wellheads and trees, extending operational weather windows, and improving drilling uptime. Systems can be qualified for HPHT, CO₂, and sour service environments and integrated with Managed Pressure Drilling (MPD) where required.

Lower cost drilling

Operate at a fraction of the spread rate of semi-submersibles in shallow water, delivering major savings in day rates, mobilisation, and overall project cost.

Safety & uptime

Dry surface BOP operations reduce weather downtime, improve well control, and increase drilling uptime compared to floating drilling units.

High-pressure capable

Our riser systems are engineered to accommodate high-pressure and HPHT environments, supporting demanding well conditions safely and efficiently.

Proven full well access delivery across global offshore projects

Our jack-up subsea drilling riser systems have been deployed across a wide range of offshore projects, including greenfield developments, brownfield tiebacks, appraisal wells, injectors, and CCS-ready schemes. Supported by rigorous engineering analysis and field-proven equipment, our solutions have enabled operators to replace semi-submersibles with jack-ups while maintaining well integrity under high-pressure conditions. The result is faster execution, reduced risk, and improved project economics across shallow-water basins worldwide.

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Products

Drilling

Proven, flexible and integrated drilling well access solutions, improving efficiency across subsea developments.

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Intervention & abandonment

Riser-based systems for safe and reliable well re-entry, for intervention and abandonment operations.

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Offshore analysis

Intelligent analysis supporting confident delivery, smarter investment and sustained project success.

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Carbon capture & storage

Expert CO₂ storage solutions, supporting tomorrow’s energy transition.

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Subsea

Integrated subsea systems connecting seabed infrastructure through to surface operations.

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Tensioning

Trusted tension capabilities built for ease, longevity and performance.

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Platforms

Innovative offshore platforms tailored to unique project needs, from concept to installation.

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Offshore equipment & services

Delivering a full suite of specialist products, supported by decades of offshore expertise.

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News & blogs

Why UK Mature-Basin Tiebacks Demand More – And What It Takes to Make Them Work

In the first article in this series, I outlined why subsea tiebacks have become the only realistic development route left in the UKCS and why the window to execute them is narrowing fast. But urgency alone doesn’t make a project deliverable. Subsea tiebacks often get described as the quick, low‑CAPEX answer to unlocking remaining reserves, especially in […]

Riser-based subsea drilling solutions