Well access, drilling, intervention & abandonment

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Well access, drilling, intervention & abandonment

A complete approach to offshore well access

Aquaterra Energy delivers safe, efficient and reliable well access solutions across the offshore lifecycle, from exploration to abandonment. With jack-up well access as a core strength, supported by engineering and analysis, our products and services reduce risk, improve performance and ensure long-term site integrity across conventional and energy transition projects.

Well access solutions across the project lifecycle

We work alongside operators to simplify complex well access, delivering complete seabed to surface solutions with jack-up well access as a specialism, engineered and assured through specialist analysis. This is complemented by targeted engineering to support floating-vessel drilling, intervention and abandonment scopes.

Well access analysis: Specialist analysis defining operating limits, load paths, vessel interactions and system behaviour across drilling, intervention and abandonment scopes
Appraisal and exploration: Cost-effective well access for appraisal and exploration campaigns, supported by early-stage engineering and offshore analysis
Subsea jack-up drilling: Seabed to surface well access systems enabling subsea drilling from jack-up rigs
Jack-up enabled intervention & abandonment: Integrated jack-up well access solutions for subsea well intervention, re-entry and well abandonment
Platforms wells: Well access engineering for drilling, intervention and abandonment over existing platforms, with analysis defining constraints and safe operating windows
Floating vessels: Specialist well access systems and offshore analysis supporting drilling, intervention and abandonment activities from floating vessels

Efficient well access using jack-up rigs

Globally, the majority of subsea wells are located in water depths accessible by jack-up rigs

More than half of new subsea tree installations forecast over the next decade are expected to be in these accessible depths

Jack-up well access can reduce well access costs by up to ~75%, delivering multi-million-dollar savings per well (Esgian, Oct 2025)

Specialist intervention and abandonment

Well access systems engineered for re-entry, intervention and permanent well abandonment

Reduced loading and controlled interfaces protect legacy wells and subsea assets

Jack-up deployed well access offers the most cost-effective route for intervention and late-life operations

Well access analysis that underpins every operation

Specialist well access analysis defining load paths, operating limits and system behaviour

Structural, fatigue and vessel interaction modelling tailored to drilling, intervention and abandonment

Removes uncertainty and unnecessary conservatism before offshore execution begins

Proven well access delivery across global offshore projects

We have delivered well access systems and engineering services worldwide, supporting drilling, intervention, abandonment and reuse across shallow to deepwater. Our work spans new drilling, mature brownfield wells, complex subsea intervention campaigns and pioneering CCS injection projects, with solutions engineered around real operating conditions and well constraints. By combining offshore analysis with fieldproven well access systems, we help operators execute safely, efficiently and predictably across diverse offshore environments.

Nigeria – multi-year subsea well intervention programme: Complete seabed to surface well access system engineered for jack-up and lift-boat deployment, enabling cost-effective intervention across multiple mature subsea wells without reliance on floating vessels
UK North Sea – Northern Endurance Partnership CCS: Seabed to surface well access for new CO2 injection wells alongside legacy well re-entry and re-abandonment services, supporting the UK’s first permitted offshore carbon storage project

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Browse our other solutions

Specialist rental equipment

Intelligently engineered equipment available on-demand to support offshore projects from seabed to surface including drilling and completions, intervention, subsea campaigns and late-life operations.

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Offshore developments

From early ideas and concept selection to FEED, execution and late-life planning we offer products and services for efficient offshore developments from project conception to closure.

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Offshore analysis

Offshore analysis for the entire project lifecycle. We offer a comprehensive range of services on both one-off scopes and long-term analysis partnerships to provide clarity and confidence.

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Our accreditations

“Well access underpins the success of every offshore project. Jack-up well access remains underutilised, despite clear cost and operational advantages. We deliver complete, seabed to surface solutions, underpinned by engineering and analysis that enable safe and efficient execution.”

Ben Cannell

Business Development and Innovation Director

Aquaterra Energy

Browse our 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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Latest

News & blogs

Beyond Tree Design: How Pressure and Well Control Critically Define Subsea Intervention Operations

In my last blog, I explored how vertical and horizontal subsea trees influence intervention planning, access routes, and operational efficiency. In practice, subsea well access is shaped by more than tree architecture. That brings us to a critical operational distinction: pressure control versus well control. Although these terms are often used together, they represent two […]

News & blogs