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Sealing the Past, Unlocking the Geothermal Future

Critical Challenges in the Energy Transition

Ensuring the success of the energy transition a range of initiatives are needed, that require a series of heavy-duty jointed pipe interventions, including pulling pipe, conveying rotation, pumping, conducting downhole measurements, and maintaining continuous well control.

Phasing out millions of wells

Millions of non-productive wells need to be safely decommissioned to prevent environmental hazards.

Supporting geothermal energy

The transition to geothermal energy requires significant support to become a viable and widely adopted alternative to traditional energy sources.

Repurposing depleted wells

Instead of closing wells, some could be reused for applications such as geothermal energy, CO2 injection, or gravity-based energy storage systems.

Introducing: The Mighty Mantis (patent pending)

The current landscape of automated solutions often involves large footprints and extended rig up times, making them less practical and often overdimensioned for many operations. More compact solutions, on the other hand, require personnel to work directly atop the well, presenting significant safety risks and operational challenges.

We firmly believe in the potential of Hydraulic Workover Technology (HWU) as a critical enabler for these complex interventions. Imagine transforming well operations into a streamlined, efficient, and eco-friendly process. Meet the Mantis, our advanced hydraulic workover unit designed to seal the past and unlock the geothermal future.

Increased Safety

No more people permanently on the well

Reduced Man-hours

Crew size you expect during a wireline operation.

Reduced Environmental Impact

Low stack height, volume, and weight which affects the value chain.

Lower Energy Consumption and Emission

On-demand system with lower sound emission.

Rapid Rig Up

Reduction of lifts and installation of parts.


Automated, yet compact and cost-effective

Reduced waiting on weather

Risks and exposure greatly reduced

Autonomous wireline

Self supported wireline rig ups

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NORSOK compliant

Our production model will comply to NORSOK

MVP specifications

Our collaborative testing with customers begins with simple wells and progresses to more complex scenarios. Initial field tests validate core functionalities and safety on the least complex wells. As complexity increases, we test adaptability and efficiency on moderately complex wells, culminating in proving capability on the most challenging wells.

Lessons learned from MVP tests will refine our production model, enabling comprehensive well management—from tubing pulling to annulus remediation and casing extraction. The envisioned specs of the NORSOK compliant production model, with larger pull, will be shared early 2025.

Technical Discussion


75 / 29 mT
165 / 64 klbs
17" Thrubore


Max 50 RPM
37 kNm / 27 kft.lbs

Axial slips

2 3/8” – 9 5/8”
Remote carriage system

Radial tongs

2 3/8 - 9 5/8”
Max 43 kNm / 32 kft.lbs

Substructure anchored

13 5/8" 5k Flange

Freestanding setup

Non anchored to well


60kW 350 LPM 310 bar
On demand accumulator support


Electric grid or battery 66kVA 2 x 63A
32A for low target depths <500m

Johan Kverneland

Johan Kverneland

Lead P&A R&D TotalEnergies Norway

Great presentation and very interesting. My view: this is what the industry needs.

Alex Lucas

Martin Straume

Discipline Lead P&A AkerBP

While there are many efforts towards smart downhole innovations, the reality is that we still need to pull tubing. In Norway, safety regulations to protect personnel from injuries require us to handle/operate all tubings and workstrings in and out of the well remotely. Today, only rigs possess that technology. The Mantis, with its light weight and remote operational ability, aligns exactly with what the industry is seeking for tubing pulling.


Senior Advisor Completions


Super creative concept that seems to be quite fit for purpose and also complimentary to evolving technologies.


P&A Director

ENI/Neptune Energy

Your case is strong if it can work on smaller platforms without a JUB or W2W vessel next to it because then tripping speed will matter.

Alex Lucas

Alex Lucas

Lead Well Engineer - Well Decommissioning TotalEnergies HQ Denmark

I think this is the best thing since bread came sliced. Finally - a lean, compact, lightweight and 'hands-free' solution!


Incorporation Ter Bron

Market Readiness Evaluations

Secured initial funding start first MVP

Startup team expanded

Base MVP ready and product market fit evaluations

TNO RCSG Rijswijk testing and ISO certification

Pre-seed round closed

First successful pilot salt well

Start onshore maturation program MVP

Norway Offshore MVP evaluation

Start engineering production model

Release production model

First offshore pilot

G2M complete and scale

Advisory board & backers

Michiel Westermann

Michiel Westermann

Co-Founder/Director Pink Elephant Roccade, Twinning, Motek Medical
Msc. Mining engineering TU Delft & MBA INSEAD

Ernst van Bruggen

Ernst van Bruggen

CPO / Co-Founder Source.ag, McKinsey, Heerema
MSc. Offshore Engineering subsea TU Delft & MBA Columbia Business School

Tom Bakker

Tom Bakker

Founder Well Engineering Partners, Well Engineering Manager R&D
PhD. Mining Engineering TU Delft

Technology Partners and Workgroups

Collaboration is key to our success. We are proud to partner with leading organizations and workgroups to advance our technology and achieve our goals.

Frequently Asked Questions

Here are some of the most common questions we receive. If you can't find what you're looking for, feel free to reach out to us directly.

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1. What proprietary technology does Ter Bron develop?

Ter Bron develops cutting-edge proprietary technology designed to efficiently and effectively close wells, repurpose existing infrastructure, and support geothermal energy projects. Our innovative solutions are tailored to meet the unique challenges of the energy sector.

2. What types of projects does Ter Bron undertake?

We work on a variety of projects that include final well closure, geothermal energy development, and repurposing existing oil and gas infrastructure for new uses. Our projects are driven by a commitment to innovation, sustainability, and operational excellence.

3. Are you hiring?

Yes, we are! Check out our careers section for the latest openings. See an opportunity to be part of our cause? Get in touch via the application form on the job postings

4. Can Ter Bron deliver turnkey projects?

Absolutely. Ter Bron has the capability to deliver turnkey projects, including the arrangement of blowout preventers, pumps and other critical components. We handle everything from planning and logistics to execution and completion, ensuring a seamless project experience.

5. Do you manufacture on demand?

No, our focus is on developing proprietary technology and delivering comprehensive project solutions through our experienced teams and innovative approaches.

6. How can I invest in Ter Bron?

Ready to ride the wave with us? We're always open to new investors. Reach out to us to discuss the details and explore the opportunities.

7. What does 'Ter Bron' mean and stand for?

"Ter Bron" loosely translates to "let's work the well," a call to action that transcends individual perspectives. Whether you’re committed to environmental preservation or focused on responsible energy production, one thing is clear: properly closing wells is essential for a sustainable future. At Ter Bron, our mission is to unite everyone in a shared commitment. By ensuring the responsible and effective closure of wells, we take a significant step toward protecting our environment and securing a better tomorrow. Join us in this crucial endeavor. Together, let's roll up our sleeves, work the wells, and make a lasting impact.