Process and apparatus for producing deep boreholes
AssigneeCoyne & Bellier, Bureau d'ingenieurs Conseils
InventorPaul Leon Guerber
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Abstract
This invention concerns the production of very deep boreholes. A rotary drilling tool is suspended at one end of a very long line of supporting elements such as a cable. During at least the entire duration of the drilling operation, the borehole is filled at least partly with at least one substance which remains in a liquid state and has a density greater than the mean density of the drilled ground strata. Thus any infiltrations in the borehole and the drilling debris move naturally upwards to the free surface of the liquid substance filling the borehole.
Claims8
Process for drilling the ground down to a very great depth, consisting in, as the drilling operation progresses downwards, filling a plurality of sections of the borehole situated one above the other with respectively a same plurality of different filling substances, each chosen so as to remain liquid at all points of the respective borehole section, while taking into account the laws which govern the increase in the ground temperature and the increase in pressure with increasing depth, and having a density greater than the average density of the drilled ground strata, so that debris and any possible infiltrations in said borehole move naturally up to the free surface of the liquid filling said borehole.
Dependencies are inferred from the claim text.