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IPC 7
  E21 - E21B 10/66  
E21B01100-E21B02518
  E21B 27/00 - E21B 49/10  

SECTION E – FIXED CONSTRUCTIONS


E 21EARTH OR ROCK DRILLING; MINING


E 21 BEARTH 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/

00Other drilling tools

11/

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

11/

04.Boring grabs

11/

06.with driven cutting chains or similarly-driven tools


12/

00Accessories for drilling tools  [3]

12/

02.Wear indicators  [3]

12/

04.Drill bit protectors  [3]

12/

06.Mechanical cleaning devices  [3]


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


15/

00Supports for the drilling machine, e.g. derricks or masts [1,7]

 

15/

02.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/

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


17/

00Drilling 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/

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

17/

02.Couplings; Joints

17/

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

 

17/

04..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/

05...Swivel joints

17/

06...Releasing-joints, e.g. safety joints

17/

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

17/

08..Casing joints

17/

10.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/

12..Devices for placing or drawing out wear protectors

17/

14.Casing shoes

17/

16.Drill collars  [3]

17/

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

17/

20.Flexible or articulated drilling pipes  [3]

17/

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


19/

00Handling 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/

02.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/

04..Hooks

19/

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

19/

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

19/

08.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/

09..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/

10.Slips; Spiders

19/

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

19/

14.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/

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

19/

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

19/

18.Connecting or disconnecting drill bit and drilling pipe  [3]

19/

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

19/

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

19/

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

 


21/

00Methods 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/

01.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/

02.Swivel joints in hose lines

21/

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

21/

07..for treating dust-laden gaseous fluids [7]

 

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 E21B 21/10)  [3]

21/

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

21/

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

21/

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

 

21/

16.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/

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

 


23/

00Apparatus 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/

01.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/

02.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/

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

23/

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

23/

06.for setting packers

23/

08.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/

10..Tools specially adapted therefor  [3]

23/

12..Tool diverters  [3]

23/

14.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/

00Apparatus 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/

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

25/

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

25/

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

25/

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

25/

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

25/

12..of the sliding wedge type  [3]

25/

14..mounted on pivot transverse to core axis  [3]

25/

16.for obtaining oriented cores  [3]

25/

18.the core receiver being specially adapted for operation under water  [3]

  E21 - E21B 10/66    E21B 27/00 - E21B 49/10  
 

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