E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B1/00—Percussion drilling
E21B1/12—Percussion drilling with a reciprocating impulse member
E21B1/24—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure
E21B1/30—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure by air, steam or gas pressure
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Engineering & Computer Science
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Mechanical Engineering
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Life Sciences & Earth Sciences
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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
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