> Meanwhile, the heat vitrifies the side of the hole, turning it essentially into a glass pipe
I think this is pretty essential and maybe even more important than the depth. Until now it was not economically feasible because the porous rock did swallow a lot of the circulated water in such a drilling. But this technique seems to solve that problem pretty effectively.
I think this is pretty essential and maybe even more important than the depth. Until now it was not economically feasible because the porous rock did swallow a lot of the circulated water in such a drilling. But this technique seems to solve that problem pretty effectively.