Special methods or apparatus for drilling

Child Classifications

Navigate with arrow keys, Enter to open

• E21B 7/001 CPC only CPC only
• E21B 7/002 CPC only CPC only
• E21B 7/003 +1 CPC CPC only CPC only
• E21B 7/007 CPC only CPC only
• E21B 7/008 CPC only CPC only
• E21B 7/02 Drilling rigs characterised by means for land transport , e.g. skid mounting or wheel mounting +7 CPC IPC+CPC Available in IPC and CPC
• E21B 7/04 Directional drilling +2 CPC IPC+CPC Available in IPC and CPC
• E21B 7/12 Underwater drilling (using heave compensators E21B19/09) +1 CPC IPC+CPC Available in IPC and CPC
• E21B 7/14 Drilling by use of heat, e.g. flame drilling +2 CPC IPC+CPC Available in IPC and CPC
• E21B 7/16 Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling IPC+CPC Available in IPC and CPC
• E21B 7/18 Drilling by liquid or gas jets, with or without entrained pellets (E21B7/14 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
• E21B 7/20 Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes since 1980 +3 CPC IPC+CPC Available in IPC and CPC
• E21B 7/24 Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B1/00) since 1980 IPC+CPC Available in IPC and CPC
• E21B 7/26 Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B7/30 takes precedence) since 1980 +2 CPC IPC+CPC Available in IPC and CPC
• E21B 7/28 Enlarging drilled holes, e.g. by counterboring since 1980 IPC+CPC Available in IPC and CPC