That doesn't sound practical at all. It doesn't matter if you have direct contact or not, everything down there is that hot, so you're gonna be that hot. Existi

That doesn't sound practical at all. It doesn't matter if you have direct contact or not, everything down there is that hot, so you're gonna be that hot. Existing oilwells already flow fluid through at a fairly high flowrate - high enough that eroding parts is a concern - and it's not enough to get the temperature down much. You're gonna need something a lot better than "just pump some water though" to cool things down enough to get the MTBF back up. And that's before accounting for how much heat this rock melting microwave laser thing plus it's power transmission lines is adding to the environment.