Patent classifications
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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E21B33/02
Surface sealing or packing
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E21B33/03
Well heads; Setting-up thereof
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E21B33/06
Blow-out preventers; , i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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E21B33/061
Ram-type blow-out preventers, e.g. with pivoting rams
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E21B33/063
for shearing drill pipes
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