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E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
E21B43/11—Perforators; Permeators
E21B43/112—Perforators with extendable perforating members, e.g. actuated by fluid means
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FR1029061D1949-12-051950-12-04Procédé et dispositif pour l'exécution, par perforation, de conduites tubulaires souterraines en terrains non cohérents
ExpiredFR1029061A
(fr)