| IPC 6 English version |
 E21 - E21B 10/66 |
| E21B01100-E21B02912 |
E21B 31/00 - E21B 49/10  |
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| SECTION E– FIXED CONSTRUCTIONS |
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| E 21 | EARTH DRILLING; MINING |
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| E 21 B | EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying E 21 C; making shafts, driving galleries or tunnels E 21 D) |
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11/ | 00 | Other drilling tools |
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11/ | 02 | . | Boring rams (percussion drives used in the borehole E 21 B 4/06; percussion drill bits E 21 B 10/36) |
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11/ | 04 | . | Boring grabs |
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11/ | 06 | . | with driven cutting chains or similarly-driven tools |
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12/ | 00 | Accessories for drilling tools [3] |
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12/ | 02 | . | Wear indicators [3] |
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12/ | 04 | . | Drill bit protectors [3] |
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12/ | 06 | . | Mechanical cleaning devices [3] |
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| Other equipment or details for drilling; Well equipment or well maintenance |
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15/ | 00 | Derricks; Masts |
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15/ | 02 | . | specially adapted for underwater drilling (E 21 B 15/04 takes precedence; floating drilling platforms B 63 B 35/44; drilling platforms on legs E 02 B 17/00) [3] |
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15/ | 04 | . | specially adapted for directional drilling, e.g. slant hole rigs [3] |
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17/ | 00 | Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (rod couplings in general F 16 D; tubes or tube couplings in general F 16 L) |
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17/ | 01 | . | Risers (riser connectors E 21 B 33/038) [3] |
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17/ | 02 | . | Couplings; Joints |
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17/ | 04 | . | . | between rod and bit, or between rod and rod |
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17/ | 042 | . | . | . | threaded |
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17/ | 043 | . | . | . | . | with locking means |
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17/ | 046 | . | . | . | with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches |
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17/ | 05 | . | . | . | Swivel joints |
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17/ | 06 | . | . | . | Releasing-joints, e.g. safety joints |
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17/ | 07 | . | . | . | Telescoping joints for varying drill string lengths; Shock absorbers (heave compensators in the derrick E 21 B 19/09; releasing-jars E 21 B 31/107) [3] |
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17/ | 08 | . | . | Casing joints |
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17/ | 10 | . | Wear protectors; Centralising devices (drives used in the borehole with anchoring means E 21 B 4/18) |
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17/ | 12 | . | . | Devices for placing or drawing out wear protectors |
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17/ | 14 | . | Casing shoes |
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17/ | 16 | . | Drill collars [3] |
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17/ | 18 | . | Pipes provided with plural fluid passages (circulation of drilling fluid by means of such pipes E 21 B 21/12) [3] |
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17/ | 20 | . | Flexible or articulated drilling pipes [3] |
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17/ | 22 | . | Rods or pipes with helical structure (drill bits with helical conveying portion E 21 B 10/44) [3] |
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19/ | 00 | Handling rods, casings, tubes or the like outside of the borehole, e.g. in the derrick (surface drives E 21 B 1/02, E 21 B 3/02) |
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19/ | 02 | . | Rod or cable suspensions (load-engaging elements for hoisting or lowering purposes in general B 66 C 1/00; crown blocks or pulley blocks B 66 D; cable guides B 66 D 1/36) |
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19/ | 04 | . | . | Hooks |
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19/ | 06 | . | . | Elevators, i.e. rod- or tube-gripping devices |
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19/ | 07 | . | . | . | Slip-type elevators (slips in rotary tables E 21 B 19/10) |
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19/ | 08 | . | Apparatus for feeding the rods or cables (E 21 B 19/22 takes precedence; hoisting drums B 66 D); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods [3] |
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19/ | 09 | . | . | specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string (drilling-pipe telescoping joints E 21 B 17/07) [3] |
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19/ | 10 | . | Slips; Spiders |
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19/ | 12 | . | Rope clamps (rope clamps in general F 16 G 11/00) |
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19/ | 14 | . | Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole (E 21 B 19/20, E 21 B 19/22 take precedence) [3] |
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19/ | 15 | . | . | Racking of rods in horizontal position; Handling between horizontal and vertical position [3] |
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19/ | 16 | . | Connecting or disconnecting pipe couplings or joints (E 21 B 19/20 takes precedence; pipe wrenches or the like B 25 B) [3] |
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19/ | 18 | . | Connecting or disconnecting drill bit and drilling pipe [3] |
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19/ | 20 | . | Combined feeding from rack and connecting, e.g. automatically [3] |
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19/ | 22 | . | Handling reeled pipe or rod units, e.g. flexible drilling pipes [3] |
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21/ | 00 | Methods or apparatus for flushing boreholes (freeing objects stuck in boreholes by flushing E 21 B 31/03; well drilling compositions C 09 K 7/00; dust eliminating or removing in mining or quarrying E 21 C 7/00) |
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21/ | 02 | . | Swivel joints in hose lines |
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21/ | 06 | . | Arrangements for treating drilling fluids above ground (treating steps per se, see the relevant subclasses) [3] |
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21/ | 08 | . | Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E 21 B 21/10) [3] |
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21/ | 10 | . | Valves arrangements in drilling-fluid circulation systems (valves in general F 16 K) [3] |
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21/ | 12 | . | using drilling pipes with plural fluid passages, e.g. closed circulation systems (pipes with plural fluid passages E 21 B 17/18) [3] |
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21/ | 14 | . | using liquid and gaseous fluids, e.g. foams [3] |
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23/ | 00 | Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens, or liners E 21 B 43/10) |
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23/ | 01 | . | for anchoring the tools or the like (E 21 B 23/02 to E 21 B 23/06 take precedence; anchoring of drives in the borehole E 21 B 4/18) [6] |
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23/ | 02 | . | for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E 21 B 23/03 to E 21 B 23/06 take precedence) [3] |
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23/ | 03 | . | for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets [3] |
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23/ | 04 | . | operated by fluid means, e.g. actuated by explosion (E 21 B 23/06, E 21 B 23/08 take precedence) [3] |
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23/ | 06 | . | for setting packers |
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23/ | 08 | . | Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems (special provisions on heads therefor E 21 B 33/068; cementing plugs E 21 B 33/16; scrapers operated by fluid pressure E 21 B 37/04) [3] |
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23/ | 10 | . | . | Tools specially adapted therefor [3] |
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23/ | 12 | . | . | Tool diverters [3] |
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23/ | 14 | . | for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells (by fluid pressure E 21 B 23/08; provision on well heads for introducing or removing cable-operated tools E 21 B 33/072, E 21 B 33/076) [6] |
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25/ | 00 | Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (core bits E 21 B 10/02; using explosives or projectiles in boreholes E 21 B 49/04; side-wall sampling or coring E 21 B 49/06) |
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25/ | 02 | . | the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe (retrievable drill bits E 21 B 10/64) [3] |
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25/ | 04 | . | . | the core receiver having a core forming cutting edge or element, e.g. punch type core barrels [3] |
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25/ | 06 | . | the core receiver having a flexible liner or inflatable retaining means [3] |
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25/ | 08 | . | Coating, freezing, consolidating cores (E 21 B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure [3] |
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25/ | 10 | . | Formed core retaining or severing means (E 21 B 25/06, E 21 B 25/08 take precedence) [3] |
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25/ | 12 | . | . | of the sliding wedge type [3] |
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25/ | 14 | . | . | mounted on pivot transverse to core axis [3] |
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25/ | 16 | . | for obtaining oriented cores [3] |
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25/ | 18 | . | the core receiver being specially adapted for operation under water [3] |
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27/ | 00 | Bailers; Valve drill bits [6] |
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27/ | 02 | . | Dump bailers, i.e. containers for depositing substances, e.g. cement or acids, in boreholes or wells [6] |
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28/ | 00 | Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for drilling E 21 B 7/24; for transmitting measuring-signals E 21 B 47/14; for geophysical measurements G 01 V 1/02) |
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29/ | 00 | Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows (perforators E 21 B 43/11) |
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29/ | 02 | . | by explosives or by thermal or chemical means (destroying objects in boreholes or wells by explosives E 21 B 31/16) |
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29/ | 04 | . | Cutting of wire lines or the like (E 21 B 29/02 takes precedence) [3] |
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29/ | 06 | . | Cutting windows, e.g. directional window cutters for whipstock operations (E 21 B 29/08 takes precedence; whipstocks E 21 B 7/08) [3] |
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29/ | 08 | . | Cutting or deforming pipes to control fluid flow (blow-out preventers E 21 B 33/06) [3] |
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29/ | 10 | . | Reconditioning of well casings, e.g. straightening [3] |
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29/ | 12 | . | specially adapted for underwater installations (E 21 B 29/08 takes precedence) [3] |
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| E21 - E21B 10/66 |  | E21B 31/00 - E21B 49/10 |
