| IPC 7 English version |
| E21-E21B01066 |
E21B 11/00 - E21B 25/18  |
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| SECTION E – FIXED CONSTRUCTIONS |
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| E 21 | EARTH OR ROCK DRILLING; MINING |
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| E 21 B | EARTH OR ROCK DRILLING (mining, quarrying E21C; making shafts, driving galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS [5] |
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| Notes |
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| (1) | This subclass covers: [7] |
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| – | primarily equipment for drilling of earth or rock in their natural formation; [7] |
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| – | similar equipment for drilling of man-made structures in situ, e.g. of road surfaces or concrete structures. [7] |
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| (2) | This subclass does not cover: [7] |
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| – | hand-held drilling machines, e.g. for domestic use; [7] |
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| – | drilling equipment for manufacturing operations, i.e. where an article is worked, e.g. for further processing; [7] |
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| which are covered by relevant subclasses of section B, e.g. B23B. [7] |
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| Subclass Index |
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| METHODS OR APPARATUS FOR DRILLING |
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| DRILLING TOOLS; ACCESSORIES THEREFOR |
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| OTHER EQUIPMENT OR DETAILS FOR DRILLING; WELL EQUIPMENT OR MAINTENANCE |
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| Derricks; drilling rods or the like |
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| Flushing or cleaning; sealing; heating or cooling |
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| Valve arrangements; fire-fighting |
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| Other equipment or details |
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| OBTAINING FLUIDS FROM WELLS |
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| CONTROL; SURVEYING OR TESTING |
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| Methods or apparatus for drilling |
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1/ | 00 | Percussion drilling (drives used in the borehole E21B 4/00) [3] |
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1/ | 02 | . | Surface drives for drop hammers, e.g. with a cable [1,7] |
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1/ | 04 | . | . | Devices for reversing the movement of the rod or cable at the surface |
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1/ | 12 | . | with a reciprocating impulse member (E21B 1/02, E21B 1/38 take precedence) [7] |
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1/ | 14 | . | . | driven by a rotating mechanism [7] |
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1/ | 16 | . | . | . | with spring-mounted reciprocating masses, e.g. with air cushion [7] |
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1/ | 18 | . | . | . | . | with elastic joining of the drive to the push-rod by double buffer springs [7] |
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1/ | 20 | . | . | . | formed as centrifugal hammers [7] |
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1/ | 22 | . | . | driven by electromagnets [7] |
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1/ | 24 | . | . | the impulse member being a piston driven directly by fluid pressure [7] |
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1/ | 26 | . | . | . | by liquid pressure [7] |
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1/ | 28 | . | . | . | . | working with pulses [7] |
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1/ | 30 | . | . | . | by air, steam or gas pressure [7] |
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1/ | 32 | . | . | . | . | working with pulses [7] |
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1/ | 34 | . | . | . | . | . | the impulse member being a piston of an internal-combustion engine [7] |
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1/ | 36 | . | Tool-carrier piston type, i.e. in which the tool is connected to an impulse member [7] |
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1/ | 38 | . | Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member [7] |
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3/ | 00 | Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B) [3] |
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3/ | 02 | . | Surface drives for rotary drilling |
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3/ | 025 | . | . | with a to-and-fro rotation of the tool [7] |
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3/ | 03 | . | . | with an intermittent unidirectional rotation of the tool [7] |
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3/ | 035 | . | . | with slipping or elastic transmission [7] |
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3/ | 04 | . | . | Rotary tables |
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3/ | 06 | . | . | . | Adaptation of rotary draw works to drive rotary tables (connecting or disconnecting couplings or joints E21B 19/16; rope, cable, or chain winding mechanisms, capstans B66D) [3] |
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4/ | 00 | Drives used in the borehole [3] |
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4/ | 02 | . | Fluid rotary type drives (hydraulic turbines for drilling wells F03B 13/02) [3] |
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4/ | 04 | . | Electric drives (E21B 4/12 takes precedence) [3] |
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4/ | 06 | . | Down-hole impacting means, e.g. hammers (percussion drill bits E21B 10/36; boring rams E21B 11/02; releasing-jars E21B 31/107) [3] |
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4/ | 08 | . | . | impact being obtained by gravity only, e.g. with lost-motion connection [3] |
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4/ | 10 | . | . | continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts [3] |
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4/ | 12 | . | . | Electrically operated hammers [3] |
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4/ | 14 | . | . | Fluid operated hammers [3] |
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4/ | 16 | . | Plural down-hole drives, e.g. for combined percussion and rotary drilling (E21B 4/10 takes precedence); Drives for multi-bit drilling units [3] |
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4/ | 18 | . | Anchoring or feeding in the borehole [3,7] |
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4/ | 20 | . | combined with surface drive (E21B 4/10 takes precedence) [3] |
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6/ | 00 | Drives for drilling with combined rotary and percussive action (drives used in the borehole E21B 4/00; portable percussive machines with superimposed rotation B25D 16/00) [3] |
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6/ | 02 | . | the rotation being continuous [7] |
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6/ | 04 | . | . | Separate drives for percussion and rotation [7] |
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6/ | 06 | . | the rotation being intermittent, e.g. obtained by a ratchet device [7] |
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6/ | 08 | . | . | Separate drives for percussion and rotation [7] |
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7/ | 00 | Special methods or apparatus for drilling (supports for the drilling machine, e.g. derricks or masts, E21B 15/00) [1,7] |
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7/ | 02 | . | Drilling rigs characterised by means for land transport, e.g. skid mounting or wheel mounting (portable drilling rigs for use on underwater floors E21B 7/124) [1,7] |
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7/ | 04 | . | Directional drilling |
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7/ | 06 | . | . | Deflecting the direction of boreholes |
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7/ | 08 | . | . | . | Special apparatus for deflecting the boring, e.g. special drill bits, knuckle joints, whipstocks (directional window cutting E21B 29/06; deflecting the direction of fishing tools E21B 31/14) |
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7/ | 10 | . | . | Correction of deflected boreholes |
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7/ | 12 | . | Underwater drilling (telescoping joints E21B 17/07; using heave compensators E21B 19/09; well heads specially adapted for underwater installations E21B 33/035) [1,7] |
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7/ | 124 | . | . | with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors [3] |
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7/ | 128 | . | . | from floating support with independent underwater anchored guide base [3] |
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7/ | 132 | . | . | from underwater buoyant support [3] |
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7/ | 136 | . | . | from non-buoyant support (E21B 7/124 takes precedence) [3] |
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7/ | 14 | . | Drilling by use of heat, e.g. flame drilling |
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7/ | 15 | . | . | of electrically generated heat [3] |
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7/ | 16 | . | Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling |
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7/ | 18 | . | Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence; hydraulic monitors E21C 45/00) [5] |
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7/ | 20 | . | Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes (surface means for applying to-and-fro rotation movements to the casing E21B 3/025; placing piles E02D 7/00; sinking shafts while moving the lining downwards E21D 1/08) [3] |
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7/ | 22 | (transferred to E21B 3/025) |
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7/ | 24 | . | Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B 1/00) [3] |
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7/ | 26 | . | Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B 7/30 takes precedence; down-hole drives E21B 4/00) [3,6] |
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7/ | 28 | . | Enlarging drilled holes, e.g. by counterboring (drill bits for enlarging the borehole E21B 10/26) [3] |
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7/ | 30 | . | . | without earth removal [6] |
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| Drilling tools |
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10/ | 00 | Drill bits (specially adapted for deflecting the direction of boring E21B 7/08; valve drill bits E21B 27/00) [3] |
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10/ | 02 | . | Core bits (characterised by wear resisting parts E21B 10/46; obtaining undisturbed cores E21B 25/00) [3] |
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10/ | 04 | . | . | with core destroying means [3] |
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10/ | 06 | . | . | Roller core bits [3] |
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10/ | 08 | . | Roller bits (roller core bits E21B 10/06; with leading portion E21B 10/26; characterised by wear resisting parts E21B 10/46) [3] |
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10/ | 10 | . | . | with roller axle supported at both ends (with disc cutters E21B 10/12) [3] |
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10/ | 12 | . | . | with disc cutters [3] |
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10/ | 14 | . | . | combined with non-rolling cutters other than of leading-portion type [3] |
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10/ | 16 | . | . | characterised by tooth form or arrangement [3] |
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10/ | 18 | . | . | characterised by conduits or nozzles for drilling fluids [3] |
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10/ | 20 | . | . | characterised by detachable or adjustable parts, e.g. legs or axles (cross axle roller bits E21B 10/10) [3] |
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10/ | 22 | . | . | characterised by bearing or lubricating details (bearings in general F16C; lubricating in general F16N) [3] |
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10/ | 24 | . | . | . | by lubricating details [3] |
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10/ | 26 | . | Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B 10/40; augers with leading portion E21B 10/44) [3] |
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10/ | 28 | . | . | with non-expansible roller cutters [3] |
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10/ | 30 | . | . | . | Longitudinal axis roller reamers, e.g. reamer stabilisers [3] |
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10/ | 32 | . | . | with expansible cutting tools [3] |
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10/ | 34 | . | . | . | of roller-cutter type [3] |
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10/ | 36 | . | Percussion drill bits (characterised by wear resisting parts E21B 10/46) [3] |
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10/ | 38 | . | . | characterised by conduits or nozzles for drilling fluids [3] |
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10/ | 40 | . | . | with leading portion [3] |
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10/ | 42 | . | Fork-type rotary drill bits, e.g. fish tail bits with detachable blades (augers with teeth E21B 10/44; characterised by wear resisting parts E21B 10/54) [3] |
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10/ | 44 | . | Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (fork-type rotary drill bits E21B 10/42; drilling rods with helical structure E21B 17/22) [3] |
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10/ | 46 | . | characterised by wear resisting parts, e.g. diamond inserts [3] |
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10/ | 48 | . | . | the bit being of core type [3] |
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10/ | 50 | . | . | the bit being of roller type [3] |
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10/ | 52 | . | . | . | with chisel- or button-type inserts [3] |
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10/ | 54 | . | . | the bit being of fork type [3] |
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10/ | 56 | . | . | Button-type inserts (E21B 10/52 takes precedence) [3] |
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10/ | 58 | . | . | Chisel-type inserts (E21B 10/52, E21B 10/54 take precedence) [3] |
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10/ | 60 | . | characterised by conduits or nozzles for drilling fluids (for roller bits E21B 10/18; for percussion drill bits E21B 10/38) [3] |
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10/ | 62 | . | characterised by parts or cutting elements which are detachable or adjustable (E21B 10/64 takes precedence; for roller bits E21B 10/20; for fork-type rotary drill bits E21B 10/42; for augers E21B 10/44) [3] |
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10/ | 64 | . | characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe (retrievable core receivers E21B 25/02) [3] |
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10/ | 66 | . | . | the cutting element being movable through the drilling pipe and laterally shiftable [3] |
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 | E21B 11/00 - E21B 25/18 |
