FR393600A - Dispositif automatique servant à faire tourner et à enfoncer le trépan en vue du forage des puits tubulaires et des puits d'extraction
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Dispositif automatique servant à faire tourner et à enfoncer le trépan en vue du forage des puits tubulaires et des puits d'extraction
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E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B6/00—Drives for drilling with combined rotary and percussive action
E21B6/06—Drives for drilling with combined rotary and percussive action the rotation being intermittent, e.g. obtained by ratchet device
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FR393600A1908-08-221908-08-22Dispositif automatique servant à faire tourner et à enfoncer le trépan en vue du forage des puits tubulaires et des puits d'extraction
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