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E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B10/00—Drill bits
E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
FR1118051D1947-12-191947-12-19Procédé pour forage de pieux, puits, puits de mines en tous terrains et en tous diamètres
ExpiredFR1118051A
(fr)
Procédé et installation pour le déblayage de masses de terre et le perçage de puits de mine en particulier pour l'extraction de minéraux souterrains