Special methods or apparatus for drilling

Child Classifications

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• E21B 7/001
• E21B 7/002
• E21B 7/003
• E21B 7/007
• E21B 7/008
• 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 (using heave compensators E21B19/09)
• 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 (E21B7/14 takes precedence)
• E21B 7/20 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 (percussion drilling E21B1/00)
• E21B 7/26 Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B7/30 takes precedence)
• E21B 7/28 Enlarging drilled holes, e.g. by counterboring