Tag: Convective dissolution

  • A Week in Bergen: My Experience at the 8th International Workshop on Offshore Geologic CO₂ Storage

    A Week in Bergen: My Experience at the 8th International Workshop on Offshore Geologic CO₂ Storage

    Last April, I packed my bags and headed to Bergen, Norway, for the 8th International Workshop on Offshore Geologic CO₂ Storage, which is two days of cutting-edge science, lively debate, and one unforgettable site visit. Organised by IEAGHG and the Gulf Coast Carbon Centre (GCCC), hosted by Equinor, and bringing together researchers, engineers, regulators, and industry players from around the world, this workshop is unlike any other event in the CCS calendar. Here’s what I took away.

    First Impressions: Bergen Sets the Scene

    Bergen is the kind of city that makes you feel like science matters. Surrounded by mountains and fjords, with the UNESCO-listed Bryggen wharf right around the corner from the conference venue, there’s something quietly inspiring about doing climate work here in a country that has been pioneering offshore CO₂ storage since the 1990s. About 3,000 Equinor employees work in the Bergen region alone, and you can feel the energy of a place where decarbonisation isn’t just a talking point, but it’s the day job.

    Day 1: A World Tour of CO₂ Storage Projects

    The workshop kicked off with an extraordinary international project roundup. In under two hours, we heard updates from CO₂ storage initiatives across the Americas, Europe, and Asia-Pacific, such as from Brazil (Petrobras), the Netherlands (Porthos), Denmark (Greensands and Bifrost), Greece (Prinos), Portugal, South Korea, Japan (Tomakomai), Taiwan, and multiple Australian projects, including CarbonNet and DeepC Store. It was a vivid reminder of just how global this effort has become.

    What struck me most was the sheer diversity of geological settings, regulatory frameworks, and project maturity levels represented in that single room. Some projects are still in exploration; others are already injecting. The gap between those stages and what it takes to bridge it ran as a thread through many of the discussions that followed.

    The afternoon moved into basin-scale management, one of the more technically complex yet critically important topics in offshore CCS. How do you manage pressure across a shared geological basin when multiple projects are injecting CO₂ into the same formations? Talks from NORCE and Norway’s regulator, SODIR, gave a sobering yet fascinating look at the regulatory and modelling challenges this poses. The session on prospect development rounded out the day, with presentations on legacy well screening, brine management, and aquifer modelling, the nuts and bolts of making a CO₂ storage site work safely over decades.

    Presenting My Research: Convective CO₂ Dissolution Under the X-ray Spotlight

    I had the privilege of presenting a poster on our group’s work at the DMEX Centre for X-ray Imaging at the Université de Pau et des Pays de l’Adour. Our research tackles a question that lies at the heart of long-term CO₂ storage safety: once CO₂ is injected underground and begins dissolving into the resident brine, how does it actually move through the rock?

    This process, called convective dissolution, is one of the key mechanisms by which CO₂ becomes permanently trapped underground. As CO₂-rich brine is denser than fresh brine, it sinks and drives a circulation that accelerates dissolution. The problem is that this process is extremely difficult to observe directly, especially in 3D, under realistic reservoir conditions.

    That’s exactly what we set out to do. Using our purpose-built X-ray tomography setup, we can image convective plumes forming and propagating through actual porous rock cores in real time, at pressures of 40–50 bar. The conversations my poster sparked were genuinely exciting as other researchers were curious about the experimental setup, the image analysis approach, and how our findings might inform reservoir simulations.

    Day 2: From Injection Lessons to Monitoring Innovation

    Day 2 had a different energy; it was more operational and focused on the current situation on the ground. The injection session opened with lessons learned from four live projects: Northern Lights, Greensands (Denmark), Poseidon (UK), and the Ravenna project in Italy. Each project is at an early stage of injection, and each came with candid reflections on what surprised them, what worked, and what they’re still figuring out.

    The monitoring sessions were, for me, one of the highlights of the whole workshop. CCS only works if we can verify that the stored CO₂ stays where we put it, and the scientific creativity behind monitoring right now is remarkable. Talks covered seismic integration, full-waveform inversion at the legendary Sleipner site, fibre-optic sensing (an enLightening story, as the presenter cheekily called it), passive acoustics, and citizen-science approaches. Each session opened up new questions: How do you monitor in a crowded offshore environment where other infrastructure gets in the way? How do you scale monitoring programs as injection ramps up?

    The afternoon’s interactive panel on the evolution of monitoring programs from baseline surveys through to full injection brought operators and regulators together in a way that felt genuinely collaborative. Hearing a Norwegian regulator (SODIR) and the UK’s NSTA discuss their approaches side by side was a valuable window into how governance frameworks are converging and where they’re still diverging.

    The Northern Lights Site Visit: Seeing CCS in Action

    If the two workshop days were the mind, the site visit to the Northern Lights project was the heart.

    We departed Bergen at 8am and arrived at the facility, where we were welcomed by the operations team. Northern Lights is the world’s first commercial cross-border CO₂ transport and storage service receiving CO₂ captured from industrial sources across Northern Europe, shipping it by tanker to Norway, and injecting it into a geological formation 2,600 metres beneath the North Sea seabed. The group from a previous workshop had visited the site back in 2020, before construction began. Seeing it now operational, with ships docking and CO₂ flowing, was extraordinary.

    We heard from the operations manager about the journey from concept to reality, the logistics of managing a fleet of ships, and what the early injection period has taught the team. The mayor of Øygarden municipality also spoke about what it means for a coastal community to have this new industry take root, a reminder that the social and economic dimensions of CCS are as real as the geological ones.

    The site itself is striking: a compact, purpose-built facility perched on the Norwegian coastline, with the North Sea stretching out beyond it. Standing there, it’s hard not to feel the weight of what’s been achieved and the scale of what still needs to happen for CCS to make a meaningful dent in global emissions.

    Final Thoughts

    What I carry away from Bergen is something beyond the specific technical content, though there was plenty of that. It is a renewed sense that the offshore CCS community is moving from proof of concept to operational reality, and doing so with rigour, transparency, and an appetite for honest conversation about what’s hard.

    For a researcher working on the fundamental science of CO₂ storage, trying to understand what happens at the pore scale when CO₂ meets brine meets rock, workshops like this are invaluable. They connect the microscopic to the global, the laboratory to the seabed, the equation to the tank. And they remind you that the work is urgent, the stakes are real, and the community doing it is genuinely excellent.

    Until the 9th edition, wherever it may be held.

    The research presented in my poster was carried out with support from the EU (grant agreement No. 850853), the E2S UPPA Hub Newpores, the CO2ES industrial chair, the EquipEX IMAGINE², and the ISIFoR project BESCO.

  • Story Behind the Paper: Free-interface convective mixing in porous media

    Story Behind the Paper: Free-interface convective mixing in porous media

    During my PhD, I held a 3-month PhD fellowship in the Department of Physics at the University of Torino, where I worked with Prof. Guido Boffetta and the Complex Systems group on the numerical simulation of convective mixing in porous media, a collaboration that became the core of this paper. Visiting Torino allowed me to immerse myself in advanced computational fluid dynamics and to better understand how fundamental fluid-mechanical instabilities manifest in porous structures, a topic at the crossroads of physics, engineering, and environmental science.

    The work examines a fluid-dynamic process that is simple in setup yet rich in physics: convective mixing driven by buoyancy in a porous medium with a free interface separating two miscible fluids. This configuration is a canonical model for situations in which a lighter fluid overlies a heavier one, and diffusive transport across the interface gradually alters the density field until an instability develops and vigorous mixing sets in. Such flows are fundamental to many natural and engineered systems, from groundwater contaminant transport and heat transfer in thermal insulation to geological carbon dioxide (CO2) sequestration, where dense CO2-rich brine can sink into deeper aquifers.

    In this study, we use high-resolution direct numerical simulations of the governing Darcy-scale flow equations to capture the initiation and evolution of convection when miscible fluids interact across a free interface in a porous medium. Our simulations were performed in both two-dimensional (2D) and three-dimensional (3D) geometries to quantify how spatial dimensionality affects plume development, mixing dynamics, and dissolution fluxes.

    A key finding is that, although both 2D and 3D simulations display similar qualitative convective behaviours, such as the formation of rising and sinking plumes that promote mixing, their mixing rates and structures differ. Specifically, the 2D setup tends to produce stronger convective fluxes and more rapid interface deformation compared to the 3D case, with dissolution fluxes approximately 15% higher. This highlights the need for caution when applying 2D results to real 3D systems, as dimensional effects can significantly influence outcomes. (Springer)

    What made this project particularly rewarding was the opportunity to collaborate across disciplines, blending physical intuition from fluid dynamics with computational techniques and environmental motivation. The fellowship in Torino was not just a change of scenery but a chance to grow as a researcher: to ask deeper questions about why mixing occurs the way it does and how seemingly small modelling choices (such as geometry or dimensionality) can have large consequences for interpretation. The result is more than a paper; it is a window into the multiscale complexity of convective processes that shape many phenomena in science and engineering.

    The free full-text PDF can be found at https://rdcu.be/e6m1G

  • New Publication: Uncovering the Dynamics of CO₂ Convective Mixing in Porous Media

    New Publication: Uncovering the Dynamics of CO₂ Convective Mixing in Porous Media

    I am pleased to announce the publication of our latest research article in Transport in Porous Media, titled “Direct Observation of Convective Mixing During CO₂ Dissolution in Saturated Transparent Porous Media.”

    This study offers real-time visual evidence of how CO₂ dissolves and starts to mix convectively in porous media, a vital process for long-term geological carbon storage. While convective dissolution has been extensively modelled, direct observations under reservoir-like conditions are still scarce. Our research helps fill this gap.

    Using high-pressure optical shadowgraphy, we observed CO₂ dissolving into a saturated porous medium under controlled temperature and pressure conditions that simulate subsurface storage environments. This setup enabled us to capture:

    • The onset of convection,
    • The growth and acceleration of descending plumes,
    • And the quantitative scaling of plume velocity with the Rayleigh number.

    Our results indicate that, within the studied conditions, the plume velocity approximately follows a square-root relationship with the Rayleigh number, providing new experimental support for predictions long established in theory and simulation. These measurements offer a valuable benchmark for refining models of CO₂ dissolution and improving forecasts of long-term storage efficiency.

    This work was made possible through collaboration with Fabrizio Croccolo, Paul Fruton, and Cedric Giraudet, whose contributions were essential to the project’s success.

    The article is available open access here:
    https://link.springer.com/article/10.1007/s11242-025-02259-0

  • Presenting at the 17th Journées d’Études des Milieux Poreux (JEMP 2025) – France InterPore Chapter, Orléans

    Presenting at the 17th Journées d’Études des Milieux Poreux (JEMP 2025) – France InterPore Chapter, Orléans

    I am pleased to announce my participation in the 17ᵗʰ Journées d’Études des Milieux Poreux (JEMP 2025), organised by the France InterPore Chapter, which will be held in Orléans, France. This conference brings together scientists and industry experts who study the movement and transport within porous materials systems, which are vital to energy, environmental, and industrial applications.

    During the conference, I will present my recent work on the convective dissolution of CO₂ in porous media, a process of great significance for geological carbon storage. Using dynamic shadowgraph imaging, my research investigates how CO₂ dissolves into a cyclohexanol/toluene (70/30 w/w) mixture and progresses through complex convective patterns within synthetic porous samples made of glass beads. These experiments illuminate the characteristic fingering structures that develop during dissolution and offer experimental data for testing theoretical scaling relationships between convective fluxes and Rayleigh numbers.

    This research aims to strengthen the connection between experimental visualisation and predictive modelling, aiding in improving our understanding of how CO₂ behaves once injected underground. A clearer understanding of these processes is crucial for evaluating the long-term safety and efficiency of carbon storage in saline aquifers.