ISOR New High-Temperature Downhole Fluid Sampler

New High-Temperature Downhole Fluid Sampler – A Major Step Forward in Geothermal Research and Sustainable Utilization

January 17, 2026

Alphaxioms Geothermal News

Iceland’s geothermal resources have long been the cornerstone of the country’s energy independence, providing nearly 100% of space heating and a substantial share of electricity production from renewable sources. Since its establishment, the Icelandic Institute of Natural History’s geothermal division — today known as ÍSOR (Iceland GeoSurvey) — has placed strong emphasis on research, innovation, and the development of cost-effective technologies to meet the challenges of geothermal utilization.

The latest milestone in this continuous effort is the successful development and field deployment of a high-temperature downhole fluid sampler, capable of collecting authentic reservoir fluid samples at extreme temperatures.

What is the High-Temperature Downhole Fluid Sampler and Why Does It Matter?

In conventional geothermal monitoring practice, fluid samples (water and steam) are usually collected at the surface from wellhead separators or atmospheric discharges. While these surface samples provide valuable information, they are significantly affected by:

- Pressure drop and flashing

- Gas loss and phase separation

- Mineral precipitation during ascent

- Mixing with condensed steam or cooler fluids

As a result, surface samples rarely represent the true deep reservoir fluid chemistry under in-situ high-temperature and high-pressure conditions.

The new high-temperature downhole fluid sampler has been specifically engineered to collect representative fluid samples directly from deep inside production wells at temperatures up to 400–500 °C. This breakthrough allows scientists and operators to obtain far more accurate geochemical data about the actual reservoir fluid in its natural deep environment.

The technology is the result of several years of intensive development within two major European research projects funded under the Horizon Europe programme:

REFLECT , focused on redefining the physical and chemical properties of geothermal fluids under extreme conditions and developing new sampling and measurement tools

COMPASS , developing sustainable concepts and cost-efficient technologies for drilling into and utilizing supercritical/superhot geothermal resources

Both projects involved close collaboration between leading European research institutions, universities and industry partners.

First Successful Field Deployment at Theistareykir

In early 2026, the sampler was used for the first time in real high-temperature production wells. Landsvirkjun (the National Power Company of Iceland) kindly provided access to two wells at the Theistareykir geothermal field, one of Iceland’s most important and economically promising high-temperature areas.

Samples were successfully collected from several different depths in both wells, giving researchers and operators — for the first time — the possibility to:

- Directly measure deep reservoir fluid composition

- Study in-situ scaling and corrosion processes

- Evaluate changes caused by reinjection

- Improve long-term reservoir evolution models

- Enhance overall resource management decisions

Here are some photographs from the historic field operation:

Theistareykir geothermal power plant – one of Iceland’s key high-temperature fields where the new sampler had its world premiere

Preparing the high-temperature downhole sampler before lowering it into a 300+ °C production well

Significance for the Future of Geothermal Energy

The introduction of reliable high-temperature downhole sampling represents one of the most important technical advances in Icelandic geothermal utilization in recent decades.

More accurate deep fluid chemistry data will help operators:

- Better monitor reservoir health

- More reliably predict scaling and corrosion risks

- Optimize reinjection strategy

- Improve long-term sustainability assessments

- Support more confident decision-making regarding field development and power plant lifetime extension

In addition, the technology is expected to become extremely valuable for future exploration of superhot geothermal resources (≥400 °C), where understanding true reservoir fluid composition is critical for both technical and economic feasibility.

Watch the Historic Moment

Below is a short video clip showing the first deployment day of the high-temperature downhole fluid sampler in Landsvirkjun’s production wells at Theistareykir (video courtesy of ÍSOR).

The successful field testing of this new tool marks an important milestone — not only for Icelandic geothermal science, but for the global geothermal industry that increasingly looks toward deeper, hotter resources to meet the growing demand for clean, baseload renewable energy.

ÍSOR’s achievement once again demonstrates why Iceland continues to be regarded as one of the world’s leading centres of geothermal research and technology development.

Alphaxioms Geothermal News will continue to follow the further application and potential commercialization of this promising technology.

Connect with us: LinkedIn, X

Source: Reflect

Comments

Hot Topics

Blowout at Cape Station: Fervo Energy’s First Major Crisis After Blockbuster IPO

Just weeks after a record-breaking IPO, the flagship project of the "geothermal unicorn" faces its first major operational crisis. By : Robert Buluma Beaver County, Utah – The morning of May 27, 2026, began like any other at the Cape Station construction site in rural Utah. Workers for Fervo Energy, the newly public darling of the renewable energy world, were engaged in the complex task of drilling deep into the Earth’s crust to unlock what the company promised would be the future of 24/7 clean power. But by the afternoon, the routine had turned into a crisis. The site had experienced a blowout—an uncontrolled release of fluid or pressure from a well. For any energy company, a blowout is a serious matter. For Fervo Energy, which had just raised $1.89 billion in a blockbuster Nasdaq debut two weeks prior, it represents an immediate stress test of its technology, its safety protocols, and its $7.7 billion market valuation. While the well has since been contained and no injur...

Eavor Geretsried Geothermal Breakthrough: Inside the Closed-Loop Energy Revolution, Drilling Challenges, and Path to Scalable Clean Power

The Geothermal “Holy Grail” Just Got a Reality Check: Inside Eavor’s Geretsried Breakthrough By: Robert Buluma May 22, 2026 It’s not every day a deep-tech energy company publishes a detailed technical report that openly documents what went wrong on its flagship project—and still comes out looking stronger. That’s exactly what Eavor Technologies did with its Geretsried geothermal project in Bavaria, Germany. The result is unusually transparent: part technical post-mortem, part validation of a technology many have doubted for years. And the core message is simple. They built it. It works. But it wasn’t smooth. The short version Eavor is trying to solve one of geothermal energy’s hardest problems: how to produce reliable heat and power anywhere, not just in rare volcanic hotspots. Their claim has always been bold: a closed-loop geothermal system that is scalable, dispatchable, low-carbon, and independent of natural reservoirs. Critics have long argued it wouldn’t survive...

Rodatherm Energy: The Refrigerant Gambit

By: Robert Buluma Rodatherm Energy has done something no other geothermal startup has attempted at commercial scale: swapped water for refrigerant in a closed-loop system. The claim is 50% higher thermal efficiency than water-based binary cycles, achieved by circulating a proprietary phase-change fluid through a fully cased, pressurized wellbore. The company emerged from stealth in September 2025 with a $38 million Series A—the largest first venture raise in geothermal history. Lead investor Evok Innovations was joined by Toyota Ventures, TDK Ventures, and the Grantham Foundation. The engineering thesis is elegant. The execution risks are significant. This is an Alphaxioms examination of both. II. The Thermodynamic Distinction Every geothermal company you've covered moves heat using water or steam. Rodatherm moves heat using a fluid that boils and condenses inside the wellbore. In a conventional closed-loop water system (Eavor's model), water circulates as a single-phase liq...

The Retrofit Revolution: How GreenFire Energy Is Turning Abandoned Oil & Geothermal Wells Into Continuous Clean Power Without New Drilling

The Retrofit Revolution: How GreenFire Energy Is Unlocking Geothermal Power Without Drilling a Single New Well By: Robert Buluma While much of the geothermal energy sector has been focused on breakthrough drilling techniques—deeper wells, hotter reservoirs, and complex engineered systems—a quieter revolution has been unfolding in the background. Instead of chasing entirely new subsurface frontiers, one company has chosen a radically simpler question: What if the answer was already in the ground? GreenFire Energy is advancing a retrofit-first geothermal strategy that targets one of the most overlooked opportunities in the global energy transition: existing wells that are underperforming, depleted, or completely abandoned. Rather than drilling new holes into the Earth, the company is reusing the infrastructure that already exists—turning stranded assets into continuous sources of clean, baseload electricity. This approach is not just technically elegant. It may also be one of ...

"Below the Surface: How Baker Hughes is Drilling the 24/7 Clean Energy Solution"

Below the Surface: How Baker Hughes is Drilling the 24/7 Clean Energy Solution By: Robert Buluma The geothermal era has arrived — and Baker Hughes is holding the drill. While much of the energy world remains fixated on LNG exports and offshore wind, a quieter revolution is taking place beneath our feet. Baker Hughes (BKR) , the Houston-based energy technology giant, has assembled what may be the most comprehensive geothermal partnership network in the industry — positioning itself as the go-to industrial executor for next-generation geothermal power. In 2026 alone, the company has locked in strategic collaborations spanning three continents, from the deserts of Saudi Arabia to the outback of Australia and the high-heat basins of the American West. The common thread? Baker Hughes is applying a century of oil and gas drilling expertise to unlock geothermal energy at industrial scale — and the data center boom is providing the perfect market catalyst. The Strategy: "G...

Mazama Energy Newberry Superhot Geothermal Breakthrough Reshapes Clean Energy

Mazama Energy’s Superhot Rock Vision Redefines Global Geothermal Power By Robert Buluma The geothermal industry is entering a new era, and one company is pushing the boundaries of what was once considered technically impossible. Mazama Energy has ignited global attention after revealing extraordinary progress at its Newberry geothermal site in central Oregon, where it reportedly achieved temperatures of 331°C in an enhanced geothermal system environment. For an industry accustomed to operating within the 150°C to 300°C range, this milestone is more than impressive — it signals the possible beginning of a technological transformation capable of reshaping the future of clean baseload power. For decades, geothermal energy has quietly remained one of the most reliable renewable energy resources on Earth. Unlike solar and wind, geothermal power does not depend on weather conditions, sunlight, or seasonal variability. It delivers continuous electricity twenty-four hours a day, seven ...

The Heat Beneath Our Feet: How Canada’s First National Geothermal Roadmap Could Redefine Clean Energy

The Heat Beneath Our Feet: Canada Invests in First National Geothermal Energy Roadmap By: Robert Buluma Image: The Eavor Wonder, something amazing 👏 Calgary, Alberta – June 11, 2026 – In a move that signals a significant shift toward diversifying its clean energy portfolio, the Government of Canada has officially invested in its first national roadmap for deep geothermal energy. The announcement, made today by the Honourable Tim Hodgson, Minister of Energy and Natural Resources , marks a pivotal moment for a country better known for its oil sands and hydroelectric dams than for harnessing the heat of the Earth’s crust. With a conditional investment of $468,000 through Natural Resources Canada’s Energy Innovation Program , the government is backing the Canadian Deep Geothermal Roadmap project. Led by the Canadian Deep Geothermal Coalition and supported by the Cascade Institute as the secretariat, this initiative aims to create a cohesive, evidence-based strate...

GEN Electric Grid Impact Study RFP in Framingham Massachusetts Advances Utility Geothermal Networks

GEN Electric Grid Impact Study RFP Signals a Defining Moment for Geothermal Energy Networks in the United States By: Robert Buluma The United States geothermal sector is entering a new phase, one where geothermal systems are no longer being viewed only as sources of heating and cooling, but increasingly as strategic infrastructure capable of strengthening the electric grid itself. In one of the most important emerging developments in utility-scale thermal network deployment, the Home Energy Efficiency Team (HEET), in partnership with Eversource Gas, has officially launched a Request for Proposals (RFP) for a groundbreaking Electric Grid Impact Study focused on Geothermal Energy Networks (GENs), also referred to as Thermal Energy Networks (TENs). Backed by funding from the U.S. Department of Energy under grant “DE-EE0010662.0002 Home Energy Efficiency Team Utility-Managed Geothermal Pilot in Framingham, Massachusetts,” the initiative represents far more than a local energy pilot. It is...

The XGS Energy Heat Sponge Solves Geothermal's Biggest Problem

The XGS Energy Heat Sponge Solves Geothermal's Biggest Problem I mage: A californian XGS well pad Imagine drilling a hole into the Earth’s hot crust but instead of simply dropping in a pipe and hoping for the best, you paint the inside of that hole with a magic material that soaks up heat like a sponge soaks up water. Then you seal it, circulate a fluid, and generate clean, firm electricity 24/7, no fracking, no water consumption, no earthquakes. That’s not science fiction. That’s XGS Energy . While most of the geothermal world has been chasing fracked reservoirs or massive drilling rigs, XGS quietly built a prototype, ran it for over 3,000 hours in one of the harshest geothermal environments on Earth, and landed a 150 MW deal with Meta – enough to power tens of thousands of homes or a massive data center campus. This is the story of a technology that might be the most elegant, low-risk, and capital-efficient path to scalable geothermal power. Let’s dig in. Part 1: The Pro...

Project Obsidian: Unlocking Superhot Geothermal Power from Deep Earth

Quaise Energy and the Dawn of Superhot Geothermal Power in Oregon By: Robert Buluma Inside Project Obsidian and the Future of Deep Earth Energy The global energy transition has long been defined by solar panels on rooftops, wind turbines across plains, and batteries reshaping grids. Yet beneath all these familiar technologies, another contender is quietly emerging—one that does not depend on weather, daylight, or even surface conditions at all. It comes from deep within the Earth itself, from rock so hot it behaves almost like a molten energy reservoir. That is the frontier where Quaise Energy is now operating. In Oregon, the company is developing what could become the world’s first superhot geothermal power plant under its ambitious initiative known as Project Obsidian . If successful, it could mark a fundamental shift in how humanity produces clean, continuous electricity—moving from shallow geothermal pockets to tapping heat sources several kilometers beneath the Earth’s surfac...

ALPHAXIOMS Geothermal News & Energy Research

Search This Blog