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  • E21B43/00
    		•  Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) [2006.01] HB CC 2D129
  • E21B43/00@A
    		•  Related to gases HB CC 2D129
  • E21B43/00@B
    		•  Related to water or spring water HB CC 2D129
  • E21B43/00@C
    		•  Related to geothermal energy HB CC 2D129
  • E21B43/00@Z
    		•  Others HB CC 2D129
  • E21B43/01
    		•  .specially adapted for obtaining from underwater installations [2006.01] HB CC 2D129
  • E21B43/013
    		•  ..Connecting a production flow line to an underwater well head [3] HB CC 2D129
  • E21B43/017
    		•  ..Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station [2006.01] HB CC 2D129
  • E21B43/02
    		•  .Subsoil filtering [2006.01] HB CC 2D129
  • E21B43/04
    		•  ..Gravelling of wells HB CC 2D129
  • E21B43/08
    		•  ..Screens or liners HB CC 2D129
  • E21B43/10
    		•  ..Setting of casings, screens or liners in wells [2006.01] HB CC 2D129
  • E21B43/11
    		•  .Perforators; Permeators HB CC 2D129
  • E21B43/112
    		•  ..Perforators with extendable perforating members, e.g. actuated by fluid means HB CC 2D129
  • E21B43/114
    		•  ..Perforators using direct fluid action, e.g. abrasive jets HB CC 2D129
  • E21B43/116
    		•  ..Gun or shaped-charge perforators HB CC 2D129
  • E21B43/117
    		•  ...Shaped-charge perforators (E21B 43/118 takes precedence) HB CC 2D129
  • E21B43/118
    		•  ...characterised by lowering in vertical position and subsequent tilting to operating position HB CC 2D129
  • E21B43/1185
    		•  ...Ignition systems [3] HB CC 2D129
  • E21B43/119
    		•  ..Details, e.g. for locating perforating place or direction HB CC 2D129
  • E21B43/12
    		•  .Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B 43/25 takes precedence; valve arrangements E21B 34/00) HB CC 2D129
  • E21B43/14
    		•  .Obtaining from a multiple-zone well HB CC 2D129
  • E21B43/16
    		•  .Enhanced recovery methods for obtaining hydrocarbons [2006.01] HB CC 2D129
  • E21B43/17
    		•  ..Interconnecting two or more wells by fracturing or otherwise attacking the formation (E21B 43/247 takes precedence) [3] HB CC 2D129
  • E21B43/18
    		•  ..Repressuring or vacuum methods HB CC 2D129
  • E21B43/20
    		•  ..Displacing by water HB CC 2D129
  • E21B43/22
    		•  ..Use of chemicals or bacterial activity (E21B 43/27 takes precedence) [2006.01] HB CC 2D129
  • E21B43/22@A
    		•  Related to chemicals HB CC 2D129
  • E21B43/22@B
    		•  Related to bacteria HB CC 2D129
  • E21B43/22@Z
    		•  Others HB CC 2D129
  • E21B43/24
    		•  ..using heat, e.g. steam injection [2006.01] HB CC 2D129
  • E21B43/241
    		•  ...combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale [5] HB CC 2D129
  • E21B43/243
    		•  ...Combustion in situ [3] HB CC 2D129
  • E21B43/247
    		•  ....in association with fracturing processes [3] HB CC 2D129
  • E21B43/248
    		•  .....using explosives [5] HB CC 2D129
  • E21B43/25
    		•  .Methods for stimulating production [2006.01] HB CC 2D129
  • E21B43/26
    		•  ..by forming crevices or fractures HB CC 2D129
  • E21B43/263
    		•  ...using explosives [3] HB CC 2D129
  • E21B43/267
    		•  ...reinforcing fractures by propping [3] HB CC 2D129
  • E21B43/27
    		•  ...by use of eroding chemicals, e.g. acids HB CC 2D129
  • E21B43/28
    		•  .Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B 43/241 takes precedence) [5] HB CC 2D129
  • E21B43/285
    		•  .Melting minerals, e.g. sulfur (E21B 43/24 takes precedence) [2006.01] HB CC 2D129
  • E21B43/29
    		•  .Obtaining a slurry of minerals, e.g. by using nozzles [5] HB CC 2D129
  • E21B43/295
    		•  .Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B 43/243 takes precedence) [5] HB CC 2D129
  • E21B43/30
    		•  .Specific pattern of wells, e.g. optimising the spacing of wells [2006.01] HB CC 2D129
  • E21B43/32
    		•  .Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells [3] HB CC 2D129
  • E21B43/34
    		•  .Arrangements for separating materials produced by the well [2006.01] HB CC 2D129
  • E21B43/36
    		•  ..Underwater separating arrangements (E21B 43/38 takes precedence) [3] HB CC 2D129
  • E21B43/38
    		•  ..in the well [3] HB CC 2D129
  • E21B43/40
    		•  ..Separation associated with re-injection of separated materials [3] HB CC 2D129
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