By Judy Feder
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“EGS/CLG Hybrid. Sage Geosystems’ approach to geothermal development combines open-to-reservoir EGS and closed-loop CLG. The Sage approach begins with drilling a well to approximately 4 to 6 km total depth.
It then uses its HeatRoot technology to propagate fractures downward, reaching at least several hundred more feet in depth and with it, much higher temperatures than the BHT of their well. The fractures are filled with a highly conductive slurry that is also convective. Then a pipe-in-pipe closed-loop heat exchange system with a supercritical circulation fluid is placed in contact with the HeatRoot network.
“Think of this system like tree roots reaching downward from the well that suck up heat from the depths and deliver it to the wellbore,” said Lev Ring, founder and CEO of Sage.
“You’ve got heat resources that would have required a well twice as deep to access, by growing some roots to feed your heat exchanger,” added Lance Cook, Sage’s president.”
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