E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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33/00
Sealing or packing boreholes or wells
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E21B33/13
Methods or devices for cementing, for plugging holes, crevices or the like
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E21B33/14
for cementing casings into boreholes
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E21B33/16
using plugs for isolating cement charge; Plugs therefor
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