Drill bit of the laser drill string with emerging laser water jet (Courtesy Fraunhofer IPT) |
(From Google Translate) Geothermal energy is a renewable energy source, low in emissions and can provide part of the base load in the energy mix. Drilling deep into the earth's crust, the temperature on average rises by about three degrees Celsius per 100 meters. However, with deep geothermal wells, the drills encounter different materials, including hard rock. These can only be drilled with low advance rates which wears out the drill bit faster. This leads to high costs, which often prevent investors from actually implementing geothermal projects. The Fraunhofer Institute for Production Technology IPT has therefore, together with partners in the research project "LaserJetDrilling", developed a method for laser-assisted mechanical drilling in hard rock and has successfully tested it in field trials.
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