{"id":19319,"date":"2024-06-18T03:05:57","date_gmt":"2024-06-18T03:05:57","guid":{"rendered":"https:\/\/energybuzz.ph\/staging\/6915\/study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs\/"},"modified":"2024-06-18T03:05:57","modified_gmt":"2024-06-18T03:05:57","slug":"study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs","status":"publish","type":"post","link":"https:\/\/energybuzz.ph\/staging\/6915\/study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs\/","title":{"rendered":"Study gives insight into heat extraction from superhot geothermal reservoirs"},"content":{"rendered":"<div>\n<p><em>A recently published study proposes a new model for harnessing heat for superhot geothermal reservoirs. The model is based on an EGS-like approach of injecting cold fluid into the superhot reservoir, thus causing embrittlement of normally ductile rock and increasing the reservoir\u2019s bulk permeability.<\/em><\/p>\n<p><em>The study by Scott et al. on <strong>\u201cHydrological constraints on the potential of enhanced geothermal systems in the ductile crust\u201d<\/strong> <a href=\"https:\/\/geothermal-energy-journal.springeropen.com\/articles\/10.1186\/s40517-024-00288-4\">has been published in the Geothermal Energy journal<\/a>.<\/em><\/p>\n<p><em>This guest article by\u00a0<a href=\"mailto:22elizabeththomson@gmail.com\">Elizabeth Thomson<\/a>, correspondent for Quaise Energy, discusses the new study and model in detail, providing insight on different approaches to harnessing superhot geothermal resources.<\/em><\/p>\n<h4><strong>A \u201cpermeability cloud\u201d<\/strong><\/h4>\n<p>Geothermal energy from the superhot rock miles below our feet has the potential to become a major player in the energy transition. However, resources and technologies will be needed to both access and extract this heat. Now a computer model sheds light on the latter, describing for the first time what happens when rock at those depths and temperatures is<br \/>\nexposed to fluids that can eventually transfer the rocks\u2019 heat to the surface.<\/p>\n<p>Essentially the model shows the formation of microscopic cracks creating a dense \u201ccloud of permeability\u201d throughout the affected rock. This is in contrast to the much larger and fewer macroscopic fractures induced by the engineered geothermal systems (EGS) in use today, which operate closer to the surface and at much lower temperatures.<\/p>\n<p>Simulations using the model <em>\u201cconfirm that a superhot system can deliver five to ten times more power than typically produced today from EGS systems for up to two decades,\u201d<\/em> says Trenton Cladouhos, Vice President of Geothermal Resource Development at <a href=\"https:\/\/www.quaise.energy\/\">Quaise Energy<\/a>, which funded the work.<\/p>\n<p>Cladouhos described the model and the importance of superhot rock geothermal systems in general on May 21 at the Geothermal Transition Summit, North America. His talk was titled, \u201cSuperhot Rock EGS: Methods, Challenges, and Pathways Forward.\u201d<\/p>\n<p>Authors of the Geothermal Energy paper are Samuel Scott of the Institute of Earth Sciences at the University of Iceland, Alina Yapparova of the Institute of Geochemistry and Petrology at ETH Zurich, Philipp Weis of the GFZ Potsdam German Research Center for Geosciences, and Matthew Houde, co-founder at Quaise.<\/p>\n<h4><strong>Superhot Rock Energy<\/strong><\/h4>\n<p>Cladouhos\u2019 remarks focused on the challenges associated with extracting heat from far under the ground where superhot rocks sit at temperatures of more than 707 \u00b0F (375 \u00b0C). Water seeping through those areas would become supercritical. This steam-like phase carries 3-4 times more energy than regular hot water, and when piped to turbines on the surface converts 2-3 times more efficiently into electricity.<\/p>\n<p>Recovery of just 2% of the thermal energy stored in hot rock 3 to 10 km [2 to 6 miles] below the continental U.S. is equivalent to 2,000 times the primary U.S. energy consumption annually, according to \u201cThe Future of Geothermal Energy,\u201d a 2006 MIT-led study on the potential for geothermal energy within the United States.<\/p>\n<p>One key problem to accessing that energy is simply getting there. The drills used by the oil and gas industries aren\u2019t designed to withstand the extreme temperatures and pressures miles down, where the mother lode of geothermal energy lies. That\u2019s why <a href=\"https:\/\/www.thinkgeoenergy.com\/quaise-energy-secures-21-million-funding-to-support-field-operations\/\">Quaise is working on a completely new way to drill using millimeter wave energy<\/a> (cousins to the microwaves many of us cook with) that can literally melt and vaporize rock.<\/p>\n<p>But drilling into superhot rock is only the first challenge. Extracting the heat is a puzzle that\u2019s at least as difficult as getting there, Cladouhos says.<\/p>\n<p>Researchers around the world are working on engineered geothermal systems, essentially underground radiators or heat exchangers, that aim to do just that. There are a variety of approaches being developed\u2014and used in the field\u2014by companies such as Eavor and Fervo Energy , but none have been demonstrated at temperatures over about 200 \u00b0C<\/p>\n<p><em>\u201cIf we really want geothermal to be a game changer, we have to operate at superhot temperatures, or over 375 \u00b0C,\u201d<\/em> Cladouhos says. But little is known about what happens when superhot rock at great depth is exposed to cold water pumped down at high pressures.<\/p>\n<h4><strong>A new understanding<\/strong><\/h4>\n<p>Currently there are three general concepts for how to extract the geothermal energy that is closer to the surface, or down to about two miles. These include closed-loop systems relying on a series of horizontal underground pipes that connect two wells. Water pumped down one well travels through these pipes, picks up the energy from the rock, then travels back up to the surface via the second well. This is the approach used by <a href=\"https:\/\/www.thinkgeoenergy.com\/eavor-receives-130m-in-financing-geretsried-geothermal-germany\/\">Eavor<\/a>. Another concept involves connecting two horizontal wells with a system of hundreds of manmade fractures. That is the approach used by <a href=\"https:\/\/www.thinkgeoenergy.com\/fervo-energy-raises-244-million-to-fund-next-generation-geothermal-initiative\/\">Fervo Energy<\/a>.<\/p>\n<p>The model Cladouhos described at the Geothermal Transition Summit\u2013and a week later at the <a href=\"https:\/\/www.catf.us\/\">Clean Air Task Force<\/a>\u2019s workshop <a href=\"https:\/\/www.thinkgeoenergy.com\/registration-open-for-workshop-on-superhot-rock-energy-28-may-2024\/\">Bridging the Gaps: Advancing Superhot Rock Energy<\/a> in Iceland\u2013represents a new concept for tapping geothermal energy, focusing on what could happen when cold water is injected under superhot, super deep conditions.<\/p>\n<figure id=\"attachment_61125\" aria-describedby=\"caption-attachment-61125\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-61125\" src=\"https:\/\/energybuzz.ph\/staging\/6915\/wp-content\/uploads\/2024\/06\/Superhot-Quaise-article.jpg\" alt=\"\" width=\"750\" height=\"534\" srcset=\"https:\/\/energybuzz.ph\/staging\/6915\/wp-content\/uploads\/2024\/06\/Superhot-Quaise-article.jpg 809w, https:\/\/www.thinkgeoenergy.com\/wp-content\/uploads\/2024\/06\/Superhot-Quaise-article-400x285.jpg 400w, https:\/\/www.thinkgeoenergy.com\/wp-content\/uploads\/2024\/06\/Superhot-Quaise-article-768x547.jpg 768w, https:\/\/www.thinkgeoenergy.com\/wp-content\/uploads\/2024\/06\/Superhot-Quaise-article-600x427.jpg 600w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\"><figcaption id=\"caption-attachment-61125\" class=\"wp-caption-text\">Different concepts for engineered geothermal systems, including a new approach described in a recent issue of Geothermal Energy. (source: Trenton Cladouhos, Quaise Energy)<\/figcaption><\/figure>\n<p>Enter the microcracks. <em>\u201cThe idea is that you\u2019re connecting wells via a large \u2018cloud\u2019 of permeability rather than specific, much larger fractures,\u201d<\/em> Cladouhos says.<em> \u201cSo it\u2019s more of a diffuse connection rather than a localized connection.\u201d<\/em><\/p>\n<p>The model is based on what we know about alteration of formations under these extreme conditions. Think of the huge open pits of orange rocks from which copper and gold ores are extracted. It is also informed by tests in Japan that have shown microcracks forming under analogous conditions in the lab. The latter work was reported last year <a href=\"https:\/\/geothermal-energy-journal.springeropen.com\/articles\/10.1186\/s40517-023-00251-9\">in a Geothermal Energy<\/a><br \/>\n<a href=\"https:\/\/geothermal-energy-journal.springeropen.com\/articles\/10.1186\/s40517-023-00251-9\">paper<\/a>.<\/p>\n<h4><strong>What\u2019s Next<\/strong><\/h4>\n<p>Cladouhos notes that the model, which Scott and colleagues continue to refine, <em>\u201cwill help guide future tests of superhot rock in the field.\u201d<\/em> Quaise aims to do just that over the next year or two at a site like Newberry volcano in central Oregon where superhot conditions can be reached at shallower depths.<\/p>\n<p>He concludes, <em>\u201cthis is a model. We don\u2019t know if the permeability due to microcracking will be enough to connect two wells in the real world. Now we need to test it and other concepts of fracturing superhot rock in the field. In the end, a hybrid approach involving planar fractures, natural fractures, and microfractures may be needed.\u201d<\/em><\/p>\n<p>Source: Elizabeth Thomson via personal correspondence<\/p>\n<p>The post <a href=\"https:\/\/www.thinkgeoenergy.com\/study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs\/\">Study gives insight into heat extraction from superhot geothermal reservoirs<\/a> first appeared on <a href=\"https:\/\/www.thinkgeoenergy.com\/\">ThinkGeoEnergy &#8211; Geothermal Energy News<\/a>.<\/div>\n","protected":false},"excerpt":{"rendered":"<div>\n<p>A new study proposes a model for permeability enhancement and pressure response during heat extraction from a superhot rock geothermal system.<\/p>\n<p>The post <a href=\"https:\/\/www.thinkgeoenergy.com\/study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs\/\">Study gives insight into heat extraction from superhot geothermal reservoirs<\/a> first appeared on <a href=\"https:\/\/www.thinkgeoenergy.com\/\">ThinkGeoEnergy &#8211; Geothermal Energy News<\/a>.<\/div>\n","protected":false},"author":1,"featured_media":19320,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[1],"tags":[4467,14835,1145,14670,14669,1272,9079,18383,462,15370,2661,17479,7490],"class_list":["post-19319","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-energy","tag-extraction","tag-from","tag-geo","tag-geothermal","tag-gives","tag-heat","tag-insight","tag-into","tag-reservoirs","tag-study","tag-superhot","tag-think"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Study gives insight into heat extraction from superhot geothermal reservoirs - Energy Buzz<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/energybuzz.ph\/study-gives-insight-into-heat-extraction-from-superhot-geothermal-reservoirs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Study gives insight into heat extraction from superhot geothermal reservoirs - Energy Buzz\" \/>\n<meta property=\"og:description\" content=\"A new study proposes a model for permeability enhancement and pressure response during heat extraction from a superhot rock geothermal system. 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