IPC 6 English version E21B-E21B 10/66

E21-E21B01066

SECTION E– FIXED CONSTRUCTIONS

E 21

EARTH DRILLING; MINING

E 21 B

EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying E 21 C; making shafts, driving galleries or tunnels E 21 D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS [5]

Methods or apparatus for drilling

Percussion drilling (drives used in the borehole E 21 B 4/00) [3]

Surface drives for percussion drilling

Devices for reversing the movement of the rod or cable at the surface

Rotary drilling (drives used in the borehole E 21 B 4/00; rotary drilling machines in general B 23 B) [3]

Surface drives for rotary drilling

Rotary tables

Adaptation of rotary draw works to drive rotary tables (connecting or disconnecting couplings or joints E 21 B 19/16; rope, cable, or chain winding mechanisms, capstans B 66 D) [3]

Drives used in the borehole [3]

Fluid rotary type drives (hydraulic turbines for drilling wells F 03 B 13/02) [3]

Electric drives (E 21 B 4/12 takes precedence) [3]

Down-hole impacting means, e.g. hammers (percussion drill bits E 21 B 10/36; boring rams E 21 B 11/02; releasing-jars E 21 B 31/107) [3]

impact being obtained by gravity only, e.g. with lost-motion connection [3]

continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts [3]

Electrically operated hammers [3]

Fluid operated hammers [3]

Plural down-hole drives, e.g. for combined percussion and rotary drilling (E 21 B 4/10 takes precedence); Drives for multi-bit drilling units [3]

Anchoring in the borehole [3]

combined with surface drive (E 21 B 4/10 takes precedence) [3]

Drives for combined percussion and rotary drilling (drives used in the borehole E 21 B 4/00) [3]

Special methods or apparatus for drilling

Portable drilling rigs, truck- or skid-mounted, with their own drive (portable drilling rigs for use on underwater floors E 21 B 7/124)

Directional drilling (derricks or masts specially adapted therefor E 21 B 15/04)

Deflecting the direction of boreholes

Special apparatus for deflecting the boring, e.g. special drill bits, knuckle joints, whipstocks (directional window cutting E 21 B 29/06; deflecting the direction of fishing tools E 21 B 31/14)

Correction of deflected boreholes

Underwater drilling (derricks or masts specially adapted therefor E 21 B 15/02; telescoping joints E 21 B 17/07; using heave compensators E 21 B 19/09)

124

with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors [3]

128

from floating support with independent underwater anchored guide base [3]

132

from underwater buoyant support [3]

136

from non-buoyant support (E 21 B 7/124 takes precedence) [3]

Drilling by use of heat, e.g. flame drilling

of electrically generated heat [3]

Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling

Drilling by liquid or gas jets, with or without entrained pellets (E 21 B 7/14 takes precedence; hydraulic monitors E 21 C 45/00) [5]

Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes (placing piles E 02 D 7/00; sinking shafts while moving the lining downwards E 21 D 1/08) [3]

Surface means for applying alternating rotation movements to the casing [3]

Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E 21 B 1/00) [3]

Drilling without earth removal, e.g. with self-propelled burrowing devices (E 21 B 7/30 takes precedence; down-hole drives E 21 B 4/00) [3,6]

Enlarging drilled holes, e.g. by counterboring (drill bits for enlarging the borehole E 21 B 10/26) [3]

without earth removal [6]

Drilling tools

10/

Drill bits (specially adapted for deflecting the direction of boring E 21 B 7/08; valve drill bits E 21 B 27/00) [3]

10/

Core bits (characterised by wear resisting parts E 21 B 10/46; obtaining undisturbed cores E 21 B 25/00) [3]

10/

with core destroying means [3]

10/

Roller core bits [3]

10/

Roller bits (roller core bits E 21 B 10/06; with leading portion E 21 B 10/26; characterised by wear resisting parts E 21 B 10/46) [3]

10/

with roller axle supported at both ends (with disc cutters E 21 B 10/12) [3]

10/

with disc cutters [3]

10/

combined with non-rolling cutters other than of leading-portion type [3]

10/

characterised by tooth form or arrangement [3]

10/

characterised by conduits or nozzles for drilling fluids [3]

10/

characterised by detachable or adjustable parts, e.g. legs or axles (cross axle roller bits E 21 B 10/10) [3]

10/

characterised by bearing or lubricating details (bearings in general F 16 C; lubricating in general F 16 N) [3]

10/

by lubricating details [3]

10/

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 E 21 B 10/40; augers with leading portion E 21 B 10/44) [3]

10/

with non-expansible roller cutters [3]

10/

Longitudinal axis roller reamers, e.g. reamer stabilisers [3]

10/

with expansible cutting tools [3]

10/

of roller-cutter type [3]

10/

Percussion drill bits (characterised by wear resisting parts E 21 B 10/46) [3]

10/

characterised by conduits or nozzles for drilling fluids [3]

10/

with leading portion [3]

10/

Fork-type rotary drill bits, e.g. fish tail bits with detachable blades (augers with teeth E 21 B 10/44; characterised by wear resisting parts E 21 B 10/54) [3]

10/

Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (fork-type rotary drill bits E 21 B 10/42; drilling rods with helical structure E 21 B 17/22) [3]

10/

characterised by wear resisting parts, e.g. diamond inserts [3]

10/

the bit being of core type [3]

10/

the bit being of roller type [3]

10/

with chisel- or button-type inserts [3]

10/

the bit being of fork type [3]

10/

Button-type inserts (E 21 B 10/52 takes precedence) [3]

10/

Chisel-type inserts (E 21 B 10/52, E 21 B 10/54 take precedence) [3]

10/

characterised by conduits or nozzles for drilling fluids (for roller bits E 21 B 10/18; for percussion drill bits E 21 B 10/38) [3]

10/

characterised by parts or cutting elements which are detachable or adjustable (E 21 B 10/64 takes precedence; for roller bits E 21 B 10/20; for fork-type rotary drill bits E 21 B 10/42; for augers E 21 B 10/44) [3]

10/

characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe (retrievable core receivers E 21 B 25/02) [3]

10/

the cutting element being movable through the drilling pipe and laterally shiftable [3]

E21B 11/00 - E21B 29/12