stumbled

The search for alternative energy sources to classic fossil fuels has led countries to use the resources they have available at their fingertips: (it is not the only thing but) Spain has sun and wind, Japan has waves and Iceland has volcanoes, many volcanoes. But unleashing the full potential of geothermal energy It is difficult: to begin with, to understand how magma chambers work, science has studied lavas that have already erupted, however they lose essential information when they violently come to the surface. This data gap is a huge obstacle to taking advantage of it, but an accident that occurred in 2009 could change everything: a drilling Iceland Deep Drilling Project touched live magma when no one expected it at just 2,104 meters deep, in the Krafla volcanic field, in northeast Iceland. What began as a mishap has become a fascinating geological experiment in recent history and a real gateway to safely exploiting geothermal energy. The discovery. Upon contact with the magma, the drilling fluids cooled the molten material in a few seconds, generating fragments of volcanic glass. This glass is a treasure for analyzing magma: normally it is not possible to carry out an analysis with the material that comes out of volcanic eruptions because it is shot like shrapnel, changing temperature and pressure. But a new study led by Janine Birnbaum and her team at the Ludwig-Maximilians-Universität München in Munich have analyzed these crystals, solving yet another little problem: that rapid cooling distorts the chemistry of the material. The analysis yielded good news: the magma was stored in conditions of saturation of volatiles at lithostatic pressure, that is, completely loaded with energy and gases, despite being so close to the surface. Why is it important. It has two most advantageous direct readings: that it has more usable energy than previously thought and that it can be drilled in a controlled manner without exploding. From an energy point of view, it is revolutionary because it validates the viability of Magma-enhanced Geothermal Systems, an evolution of conventional geothermal that seeks to extract heat directly from the vicinity of a magmatic body or superhot rocks (when they exceed 374 °C). A well under these conditions has an energy transport capacity between 5 and 10 times greater than traditional geothermal energy, as CATF explainsa nonprofit organization specializing in energy policy. But for the first time there is a robust mathematical tool to predict the behavior of magma during drilling. This is essential for security, critical when considering this resource as exploitable or not. In fact, it can applied already in a veteran projecthe Krafla Magma Testbedwhich has been running since 2014 with this goal in mind. Exploitation diagram of a superhot rock. CATF Context. Iceland sits on the Mid-Atlantic Ridge, the border between the Eurasian and North American tectonic plates, making it one of the most geologically active territories on the planet. Nearly 30% of its electricity already comes from geothermal sources and almost 66% comes from renewable sources, according to IRENAbut this constitutes a giant step to continue delving into geothermal energy. Until now, conventional geothermal energy is limited to extracting heat from groundwater at temperatures between 150 and 300 °C. He IDDP (Iceland Deep Drilling Project) is the research program in which both scientific organizations and Icelandic energy companies have participated since the 2000s. Following the 2009 incident, the KMT project emerged in 2014 with an even greater ambition: not to stop at drilling near the magma, but inside it, but in an intentional and controlled way. How they do it. The methodology is based on the quenchingthe rapid tempering of the samples obtained by drilling the magma, which become vitrified. The scientific team analyzed its water content, carbon dioxide and the structure of vapor bubbles that formed during cooling. From these measurements, they built numerical simulations of how bubbles grow and are reabsorbed under different pressure and temperature trajectories, using H₂O and CO₂ diffusion models. already validated. These models use the speed at which bubbles try to escape the magma during drilling to reverse engineer what the exact pressure and volatile content were before the drill bit acted. The solution they obtained was magma at a lithostatic pressure of between 50 and 57 MPa and a temperature of approximately 900 °C. The KMT’s plan now is to use this model to design the two wells it plans to drill. Yes, but. The model is solid and the paper has passed peer review in the demanding Nature, but the engineering challenge remains stratospheric. Just because magma is safe to drill into in theory doesn’t mean it the engineering to do it on an industrial scale is resolved (spoiler: it is not): it is necessary to use materials and sensors capable of withstanding these extreme temperatures in a sustained manner and the chemistry of these environments is corrosive. On the other hand, there is geographical limitation: this technique is mainly applicable in rift zones or hot spots where the magma is at reachable depths (less than five kilometers). Expanding this technology worldwide will require drilling up to 10 kilometers, where the pressure and heat exceed the current capabilities of most oilfield and geothermal services companies. 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