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Publication of BE484816ApublicationCriticalpatent/BE484816A/xx
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
E21B44/02—Automatic control of the tool feed
E21B44/08—Automatic control of the tool feed in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil