If the ambient temperature is already close to 500°C (at a depth of around 13 km), I cannot see how you want to work with a liquid - and there is (NOT YET) no drill at all working and generating additional heat! And your great diamond drill bit will be worn out in no time at such a temperature. The idea with the bucket will certainly work up to several hundred meters - if the drill and rods have been removed from the borehole beforehand - I am curious to see what the client says about a drilling system where the entire string has to be pulled back every 10...
Due to the fact that must be drilled in Granite - THIS rock does NOT flow into the borehole .
And if Granite will be vaporated, than any fluid anyway - that would be a coocking kettle .
And if the rock will be vaporated - the wall is melting and will get a thick and stabile rock glaze !
That stabilisizes and seals same time like an intruded tube!
ertical holesYes: conventional drilling requires much less energy - but takes 30 times longer!
To ensure stability - the two vertical boreholes and the bundle of connecting boreholes of the "heat exchanger" for the closed loop system must be installed in solid granite!
- - Advance there: conventional 1 to 1.5 m/h - with evaporation 35 to 40 m/h (for Diameter ~2 inch).
For a 1 GW-construct 4m /hr are realistic - so one of the two vertical holes can be drilled in 4000 hrs -
nearly half of a ...
In this context, the most important advantage of supercritical water is that it contains nearly SIX times as much energy per ton - e.g. at 300 bar and 600°C - than in 160 bar 300°C superheated steam.
As a result, almost 5 times less water has to be driven through the heat exchanger system at depth - whereby - due to the higher pressure - the pump load is about three times lower - and about five times the output is possible with the same borehole diameter. Stone is a poor conductor of heat. So after the initial heat loss to heat up the wall of the riser bore... (read more)