Geothermal Energy is Changing

Scientific Concepts, Discoveries, and Nature Phenomena

• Kola Superdeep Borehole: The deepest hole ever drilled on Earth (12 km deep), revealing unexpected scientific insights about Earth's subsurface.
• Geothermal Energy: Heat generated by fission reactions deep within the Earth’s core (~6000°C), with potential to supply humanity’s energy needs for millions of years.
• Temperature Gradient in Earth’s Crust: Temperature increases roughly 30°C per kilometer of depth.
• Supercritical Steam: Steam at ~374°C and 22 MPa pressure, which is highly efficient for driving turbines in geothermal power plants.
• Challenges of Deep Drilling:
  • Exponentially increasing drilling costs with depth.
  • Mechanical wear and damage to drill bits due to heat and hard rock.
  • Difficulty in replacing drill bits in very deep boreholes.
  • Borehole instability requiring costly reinforcements.
• Geothermal Energy Limitations: Only a few locations (e.g., Iceland) have geothermal heat near the surface, limiting global Geothermal Energy use.

Quaise Energy’s Novel Drilling Technology

• Gyrotron Technology:
  • Adapted from nuclear fusion reactors.
  • Uses high-power, high-frequency electromagnetic waves (millimeter waves) to vaporize rock without physical contact.
  • Generates a beam of electrons accelerated in a magnetic field to emit intense electromagnetic radiation (maser-like).
  • The beam is delivered via hollow metal pipes called waveguides.
• Drilling Methodology:
  • Conventional drilling used until depth where it becomes inefficient.
  • Then switch to gyrotron-based vaporization to melt and vaporize rock.
  • Nitrogen purge gas removes vaporized rock.
  • Controlled melting can create a natural obsidian-like casing to stabilize boreholes.
• Advantages:
  • Continuous drilling without needing to replace drill bits.
  • Potentially faster rate of penetration (ROP) than conventional methods.
  • Ability to drill deeper and wider holes (e.g., 4-inch hole at 100 kW gyrotron, aiming for 8-inch hole at 1 MW gyrotron).
• Current Performance:
  • 4-inch holes drilled at about 1 meter per hour in lab conditions.
  • Targeting similar rates for larger holes with higher power gyrotrons.
• Limitations and Challenges:
  • High energy consumption (gyrotron requires megawatt-scale power).
  • Water infiltration in boreholes could absorb energy and reduce efficiency.
  • Field testing needed to validate obsidian casing effectiveness and real-world drilling costs.
  • Equipment must be rugged, containerized, and portable for field use.
  • High-voltage power supply (50,000 V DC) custom-built for gyrotron operation.
• Economic Considerations:
  • Drilling costs rise steeply with depth.
  • Capital costs include gyrotron (~$1.1M), waveguides (~$2.3M), rig structure (~$8M), and compressors/pumps (~$7.5M).
  • Estimated total capital cost for 7 km borehole: ~$19 million.
  • Electricity cost for gyrotron operation for 7 km hole estimated at ~$525,000.
  • Levelized Cost of Electricity (LCOE) estimated at ~$115/MWh at Marble Falls, Texas, comparable to nuclear power but higher than onshore wind (~$30/MWh).
  • Potential for more competitive costs in other locations (~$68/MWh).
• Geological Factors:
  • Rock type affects drilling efficiency; basalt is more homogeneous and easier to drill than granite due to quartz content.
  • Quartz-rich rocks reflect millimeter waves more, reducing drilling speed.
• Future Prospects:
  • Field trials planned in Marble Falls, Texas.
  • Success could enable deep Geothermal Energy extraction near existing fossil fuel plants, aiding renewable energy transition.
  • Could revolutionize Geothermal Energy by drastically lowering drilling costs and enabling access to supercritical steam resources.

Additional Notes

• Onshape Software: Mentioned as a modern, cloud-based CAD platform useful for engineering design and collaboration, highlighting the importance of advanced software in developing such technologies.

Researchers and Sources Featured

• Quaise Energy: Startup developing gyrotron-based drilling technology.
• Drilling Engineers and Company Representatives: Including Henry and Brian (Quaise team members).
• Kola Superdeep Borehole Project: Historical reference.
• Fusion Reactor Technology: Source of Gyrotron Technology inspiration.
• Levelized Cost of Electricity (LCOE) Data: Referenced for cost comparisons.
• Onshape: Engineering software company mentioned in context of design tools.

Summary: The video explores the challenges and innovations in Geothermal Energy extraction, focusing on Quaise Energy’s pioneering use of Gyrotron Technology—high-power millimeter-wave electromagnetic radiation—to vaporize rock and drill