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
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Life Sciences & Earth Sciences
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Engineering & Computer Science
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Geology
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Mining & Mineral Resources
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Physics & Mathematics
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Environmental & Geological Engineering
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Fluid Mechanics
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General Life Sciences & Earth Sciences
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Geochemistry & Mineralogy
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Perforating, Stamping-Out Or Severing By Means Other Than Cutting
(AREA)
Procede de commande d'un dispositif demarreur d'un moteur thermique, du type a deux demarreurs et dispositif pour la mise en oeuvre de ce procede
Dispositif de commande pour un moteur a induction a au moins deux enroulements de phase en tant que moteur d'entrainement d'une machine a traiter le linge