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  • E21B7/00
    		•  Special methods or apparatus for drilling [2006.01] HB CC 2D129
  • E21B7/00@E
    		•  Earth augers (of single axis; of multi-spindle augers E02F 5/02) HB CC 2D129
  • E21B7/00@A
    		•  .Earth augers for drilling shaft holes HB CC 2D129
  • E21B7/00@B
    		•  .Earth augers for digging pole holes HB CC 2D129
  • E21B7/00@C
    		•  .Earth augers for drilling planting holes HB CC 2D129
  • E21B7/00@Z
    		•  Others HB CC 2D129
  • E21B7/02
    		•  .Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting [2006.01] HB CC 2D129
  • E21B7/04
    		•  .Directional drilling HB CC 2D129
  • E21B7/04@A
    		•  Horizontal drilling rigs HB CC 2D129
  • E21B7/04@Z
    		•  Others HB CC 2D129
  • E21B7/06
    		•  ..Deflecting the direction of boreholes HB CC 2D129
  • E21B7/08
    		•  ...Special apparatus for deflecting the boring, e.g. special drill bits, knuckle joints or whipstocks [2006.01] HB CC 2D129
  • E21B7/10
    		•  ..Correction of deflected boreholes HB CC 2D129
  • E21B7/12
    		•  .Underwater drilling (using heave compensators E21B 19/09) [2006.01] HB CC 2D129
  • E21B7/124
    		•  ..with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors [3] HB CC 2D129
  • E21B7/128
    		•  ..from floating support with independent underwater anchored guide base [3] HB CC 2D129
  • E21B7/132
    		•  ..from underwater buoyant support [3] HB CC 2D129
  • E21B7/136
    		•  ..from non-buoyant support (E21B 7/124 takes precedence) [3] HB CC 2D129
  • E21B7/14
    		•  .Drilling by use of heat, e.g. flame drilling HB CC 2D129
  • E21B7/15
    		•  ..of electrically generated heat [3] HB CC 2D129
  • E21B7/16
    		•  .Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling HB CC 2D129
  • E21B7/18
    		•  .Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence) [2006.01] HB CC 2D129
  • E21B7/20
    		•  .Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes [2006.01] HB CC 2D129
  • E21B7/24
    		•  .Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B 1/00) [3] HB CC 2D129
  • E21B7/26
    		•  .Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B 7/30 takes precedence) [2006.01] HB CC 2D129
  • E21B7/28
    		•  .Enlarging drilled holes, e.g. by counterboring [2006.01] HB CC 2D129
  • E21B7/30
    		•  ..without earth removal [6] HB CC 2D129
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