Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute
Patent
1991-02-20
1992-12-08
Bagnell, David J.
Boring or penetrating the earth
Boring by directly applying heat to fluidize or comminute
299 14, E21B 714, E21C 3716
Patent
active
051689405
ABSTRACT:
Only a gap defining the outer profile of the tunnel or borehole is melted down in a peripheral heat drilling process for tunnels, deep-well and exploration boreholes. The drill core, surrounded by the generated gap, initially remains and is then extracted at intervals via a tube. It is expedient for the drill core to be sheared off and extracted continuously after it has passed a cooling zone. The height of the drill core, which first remains in the borehole, is determined such that the molten rock can be pressed into the drill core, whereby the necessary pressure for this pressing in is maintained essentially constant, independently of the depth of the borehole concerned.
REFERENCES:
patent: 914636 (1909-03-01), Case
patent: 4304308 (1981-12-01), Munding et al.
Los Alamos Scientific Laboratory Report "Rock Melting as a Drilling Technique" Mar. 1965.
Bagnell David J.
Kasper Horst M.
Technologie Transfer Est.
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