Special methods or apparatus for drilling

Classification Context

Section:

FIXED CONSTRUCTIONS

Class:

EARTH OR ROCK DRILLING; MINING

Subclass:

EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

Child Classifications

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• E21B 7/02 Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting
• E21B 7/04 Directional drilling
• E21B 7/12 Underwater drilling
• E21B 7/14 Drilling by use of heat, e.g. flame drilling
• E21B 7/16 Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
• E21B 7/18 Drilling by liquid or gas jets, with or without entrained pellets
• E21B 7/2 Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
• E21B 7/24 Drilling using vibrating or oscillating means, e.g. out-of-balance masses
• E21B 7/26 Drilling without earth removal, e.g. with self-propelled burrowing devices
• E21B 7/28 Enlarging drilled holes, e.g. by counterboring