IPC 7 English version E21B 11/00-E21B 25/18

IPC ⁷ English version

E21 - E21B 10/66

E21B01100-E21B02518

E21B 27/00 - E21B 49/10

SECTION E – FIXED CONSTRUCTIONS

E 21

EARTH OR ROCK DRILLING; MINING

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]

11/

Other drilling tools

11/

Boring rams (percussion drives used in the borehole E21B 4/06; percussion drill bits E21B 10/36)

11/

Boring grabs

11/

with driven cutting chains or similarly-driven tools

12/

Accessories for drilling tools [3]

12/

Wear indicators [3]

12/

Drill bit protectors [3]

12/

Mechanical cleaning devices [3]

Other equipment or details for drilling; Well equipment or well maintenance

15/

Supports for the drilling machine, e.g. derricks or masts [1,7]

15/

specially adapted for underwater drilling (E21B 15/04 takes precedence; floating drilling platforms B63B 35/44; drilling platforms on legs E02B 17/00) [3]

15/

specially adapted for directional drilling, e.g. slant hole rigs [3]

17/

Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (rod couplings in general F16D; tubes or tube couplings in general F16L)

17/

Risers (riser connectors E21B 33/038) [3]

17/

Couplings; Joints

17/

between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer [7]

17/

between rod and bit, or between rod and rod

17/

042

threaded

17/

043

with locking means

17/

046

with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches

17/

Swivel joints

17/

Releasing-joints, e.g. safety joints

17/

Telescoping joints for varying drill string lengths; Shock absorbers (heave compensators in the derrick E21B 19/09; releasing-jars E21B 31/107) [3]

17/

Casing joints

17/

Wear protectors; Centralising devices (drives used in the borehole with anchoring means E21B 4/18; guiding or centralising devices outside the borehole E21B 19/24)

17/

Devices for placing or drawing out wear protectors

17/

Casing shoes

17/

Drill collars [3]

17/

Pipes provided with plural fluid passages (circulation of drilling fluid by means of such pipes E21B 21/12) [3]

17/

Flexible or articulated drilling pipes [3]

17/

Rods or pipes with helical structure (drill bits with helical conveying portion E21B 10/44) [3]

19/

Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables (surface drives E21B 1/02, E21B 3/02)

19/

Rod or cable suspensions (load-engaging elements for hoisting or lowering purposes in general B66C 1/00; crown blocks or pulley blocks B66D; cable guides B66D 1/36)

19/

Hooks

19/

Elevators, i.e. rod- or tube-gripping devices

19/

Slip-type elevators (slips in rotary tables E21B 19/10)

19/

Apparatus for feeding the rods or cables (E21B 19/22 takes precedence; automatic feed E21B 44/02; hoisting drums B66D); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods [3,7]

19/

081

Screw-and-nut feed mechanisms [7]

19/

083

Cam, rack or like feed mechanisms [7]

19/

084

with flexible drawing means, e.g. cables [7]

19/

086

with a fluid-actuated cylinder (E21B 19/084, E21B 19/087, E21B 19/09 take precedence) [7]

19/

087

by means of a swinging arm [7]

19/

089

with a spring or an additional weight [7]

19/

specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string (drilling-pipe telescoping joints E21B 17/07) [3]

19/

Slips; Spiders

19/

Rope clamps (rope clamps in general F16G 11/00)

19/

Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole (E21B 19/20, E21B 19/22 take precedence) [3]

19/

Racking of rods in horizontal position; Handling between horizontal and vertical position [3]

19/

Connecting or disconnecting pipe couplings or joints (E21B 19/20 takes precedence; pipe wrenches or the like B25B) [3]

19/

Connecting or disconnecting drill bit and drilling pipe [3]

19/

Combined feeding from rack and connecting, e.g. automatically [3]

19/

Handling reeled pipe or rod units, e.g. flexible drilling pipes [3]

19/

Guiding or centralising devices for drilling rods or pipes [7]

21/

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B 31/03; well drilling compositions C09K 7/00) [2,7]

21/

Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes (arrangements for treating drilling fluids E21B 21/06) [7]

21/

015

Means engaging the bore entrance, e.g. hoods for collecting dust [7]

21/

Swivel joints in hose lines

21/

Arrangements for treating drilling fluids outside the borehole (treating steps per se, see the relevant subclasses) [3]

21/

for treating dust-laden gaseous fluids [7]

21/

Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B 21/10) [3]

21/

Valves arrangements in drilling-fluid circulation systems (valves in general F16K) [3]

21/

using drilling pipes with plural fluid passages, e.g. closed circulation systems (pipes with plural fluid passages E21B 17/18) [3]

21/

using liquids and gases, e.g. foams [3]

21/

using gaseous fluids (E21B 21/14 takes precedence; arrangements for handling drilling fluids outside the borehole E21B 21/01; arrangements for treating drilling fluids E21B 21/06) [7]

21/

Preventing exhaust air from the drill motor from blowing-off towards the working face [7]

23/

Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens, or liners E21B 43/10)

23/

for anchoring the tools or the like (E21B 23/02 to E21B 23/06 take precedence; anchoring of drives in the borehole E21B 4/18) [6]

23/

for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E21B 23/03 to E21B 23/06 take precedence) [3]

23/

for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets [3]

23/

operated by fluid means, e.g. actuated by explosion (E21B 23/06, E21B 23/08 take precedence) [3]

23/

for setting packers

23/

Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems (special provisions on heads therefor E21B 33/068; cementing plugs E21B 33/16; scrapers operated by fluid pressure E21B 37/04) [3]

23/

Tools specially adapted therefor [3]

23/

Tool diverters [3]

23/

for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells (by fluid pressure E21B 23/08; provision on well heads for introducing or removing cable-operated tools E21B 33/072, E21B 33/076) [6]

25/

Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (core bits E21B 10/02; using explosives or projectiles in boreholes E21B 49/04; side-wall sampling or coring E21B 49/06)

25/

the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe (retrievable drill bits E21B 10/64) [3]

25/

the core receiver having a core forming cutting edge or element, e.g. punch type core barrels [3]

25/

the core receiver having a flexible liner or inflatable retaining means [3]

25/

Coating, freezing, consolidating cores (E21B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure [3]

25/

Formed core retaining or severing means (E21B 25/06, E21B 25/08 take precedence) [3]

25/

of the sliding wedge type [3]

25/

mounted on pivot transverse to core axis [3]