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IPC 7
  E21B 11/00 - E21B 25/18  
E21B02700-E21B04910
 

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]


27/

00Bailers; Valve drill bits  [6]

27/

02.Dump bailers, i.e. containers for depositing substances, e.g. cement or acids, in boreholes or wells  [6]


28/

00Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for drilling E21B 7/24; for transmitting measuring-signals E21B 47/14; for geophysical measurements G01V 1/02) [6]


29/

00Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows (perforators E21B 43/11); Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground

29/

02.by explosives or by thermal or chemical means (destroying objects in boreholes or wells by explosives E21B 31/16)

29/

04.Cutting of wire lines or the like (E21B 29/02 takes precedence)  [3]

29/

06.Cutting windows, e.g. directional window cutters for whipstock operations (E21B 29/08 takes precedence; whipstocks E21B 7/08)  [3]

29/

08.Cutting or deforming pipes to control fluid flow (blow-out preventers E21B 33/06)  [3]

29/

10.Reconditioning of well casings, e.g. straightening  [3]

29/

12.specially adapted for underwater installations (E21B 29/08 takes precedence)  [3]


31/

00Fishing for or freeing objects in boreholes or wells (provisions on well heads for introducing or removing objects E21B 33/068; locating or determining the position of objects in boreholes or wells E21B 47/09)

31/

03.Freeing by flushing  [3]

31/

06.using magnetic means  [3]

31/

08.using junk baskets or the like  [3]

31/

107.using impact means for releasing stuck parts, e.g. jars (telescoping joints E21B 17/07)  [3]

31/

113..hydraulically operated  [3]

31/

12.Grappling tools, e.g. tongs or grabs

31/

14..with means deflecting the direction of the tool, e.g. by use of knuckle joints (apparatus for deflecting the boring E21B 7/08)  [3]

31/

16..combined with cutting or destroying means (cutting or destroying means per se E21B 29/00)  [3]

31/

18..gripping externally, e.g. overshot  [3]

31/

20..gripping internally, e.g. fishing spears  [3]


33/

00Sealing or packing boreholes or wells

33/

02.Surface sealing or packing

33/

03..Well heads; Setting-up thereof (valve arrangements therefor E21B 34/02)

33/

035...specially adapted for underwater installations (E21B 33/043, E21B 33/064, E21B 33/076 take precedence)  [3]

33/

037....Protective housings therefor  [3]

33/

038....Connectors used on well heads, e.g. for connecting blow-out preventer and riser (connecting a production flow line to an underwater well head E21B 43/013)  [3]

33/

04...Casing heads; Suspending casings or tubings in well heads (setting of casings in wells E21B 43/10)

33/

043....specially adapted for underwater well heads (E21B 33/047 takes precedence)  [3]

33/

047....for plural tubing strings  [3]

33/

05....Cementing-heads, e.g. having provision for introducing cementing plugs

33/

06...Blow-out preventers  [3]

33/

064....specially adapted for underwater well heads (connectors therefor E21B 33/038)  [3]

33/

068...having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B 33/05)  [3]

33/

072....for cable-operated tools (E21B 33/076 takes precedence)  [3]

33/

076....specially adapted for underwater installations  [3]

33/

08..Wipers; Oil savers

33/

10.in the borehole

33/

12..Packers; Plugs (used for cementing E21B 33/134, E21B 33/16)

33/

122...Multiple-string packers

33/

124...Units with longitudinally-spaced plugs for isolating the intermediate space

33/

126...with fluid-pressure-operated elastic cup or skirt (E21B 33/122, E21B 33/124 take precedence)

33/

127...with inflatable sleeve (E21B 33/122, E21B 33/124 take precedence)

33/

128...with a member expanded radially by axial pressure (E21B 33/122, E21B 33/124 take precedence)

33/

129...with mechanical slips for hooking into the casing (E21B 33/122, E21B 33/124 take precedence)

33/

1295....actuated by fluid pressure  [6]

33/

13..Methods or devices for cementing, for plugging holes, crevices, or the like (dump bailers E21B 27/02; soil-conditioning or soil-stabilising materials C09K 17/00)

33/

134...Bridging plugs

33/

136...Baskets, e.g. of umbrella type

33/

138...Plastering the borehole wall; Injecting into the formation

33/

14...for cementing casings into boreholes

33/

16....using plugs for isolating cement charge; Plugs therefor


34/

00Valve arrangements for boreholes or wells (in drilling fluid circulation systems E21B 21/10; blow-out preventers E21B 33/06; oil flow regulating apparatus E21B 43/12; valves in general F16K) [3]

34/

02.in well heads  [3]

34/

04..in underwater well heads  [3]

34/

06.in wells  [3]

34/

08..responsive to flow or pressure of the fluid obtained (E21B 34/10 takes precedence)  [3]

34/

10..operated by control fluid supplied from outside the borehole (control means being outside the borehole E21B 34/16)  [3]

34/

12..operated by movement of casings or tubings  [3]

34/

14..operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools  [3]

34/

16.Control means therefor being outside the borehole  [3]


35/

00Methods or apparatus for preventing or extinguishing fires (cutting or deforming pipes to control fluid flow E21B 29/08; controlling flow of fluid to or in wells E21B 43/12; fire fighting in general A62C, A62D)


36/

00Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (drilling by use of heat E21B 7/14; secondary recovery methods using heat E21B 43/24) [3]

36/

02.using burners  [3]

36/

04.using electrical heaters  [3]


37/

00Methods or apparatus for cleaning boreholes or wells (E21B 21/00 takes precedence; cleaning pipes in general B08B 9/02)

37/

02.Scrapers specially adapted therefor

37/

04..operated by fluid pressure, e.g. free-piston scrapers (operating other tools by fluid pressure E21B 23/08)  [3]

37/

06.using chemical means for preventing or limiting the deposition of paraffins or like substances  [3]

37/

08.cleaning in situ of down-hole filters, screens, or gravel packs (E21B 37/06 takes precedence)  [3]

37/

10.Well swabs  [3]


40/

00Tubing catchers, automatically arresting the fall of oil-well tubing


41/

00Equipment or details not covered by groups E21B 15/00 to E21B 40/00

41/

02.in situ inhibition of corrosion in boreholes or wells (dump bailers E21B 27/02; inhibiting corrosion in general C23F)  [3,6]

41/

04.Manipulators for underwater operations, e.g. temporarily connected to well heads (manipulators in general B25J)  [3]

41/

06.Work chambers for underwater operations, e.g. temporarily connected to well heads (in general B63C 11/00)  [3]

41/

08.Underwater guide bases, e.g. drilling templates; Levelling thereof [7]

 

41/

10.Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases [7]

 


Obtaining fluids from wells  [3]


43/

00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B; obtaining oil-bearing deposits or soluble or meltable materials by mining techniques E21C 41/00; pumps F04)

43/

01.specially adapted for obtaining from underwater installations (underwater well heads E21B 33/035)

43/

013..Connecting a production flow line to an underwater well head  [3]

43/

017..Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station (underwater separating arrangements E21B 43/36)  [3]

43/

02.Subsoil filtering (E21B 43/11 takes precedence)

43/

04..Gravelling of wells

43/

08..Screens or liners

43/

10..Setting of casings, screens or liners in wells (driving or forcing casings into boreholes, simultaneously drilling and casing boreholes E21B 7/20; setting of tools, packers or the like E21B 23/00; suspending casings in well heads E21B 33/04)

43/

11.Perforators; Permeators

43/

112..Perforators with extendable perforating members, e.g. actuated by fluid means

43/

114..Perforators using direct fluid action, e.g. abrasive jets

43/

116..Gun or shaped-charge perforators

43/

117...Shaped-charge perforators (E21B 43/118 takes precedence)

43/

118...characterised by lowering in vertical position and subsequent tilting to operating position

43/

1185...Ignition systems  [3]

43/

119..Details, e.g. for locating perforating place or direction

43/

12.Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B 43/25 takes precedence; valve arrangements E21B 34/00)

43/

14.Obtaining from a multiple-zone well

43/

16.Enhanced recovery methods for obtaining hydrocarbons (fracturing E21B 43/26; obtaining slurry E21B 43/29; reclamation of contaminated soil in situ B09C)

43/

17..Interconnecting two or more wells by fracturing or otherwise attacking the formation (E21B 43/247 takes precedence)  [3]

43/

18..Repressuring or vacuum methods

43/

20..Displacing by water

43/

22..Use of chemicals or bacterial activity (E21B 43/27 takes precedence; chemical features in extracting oils from oil sands or shales C10G)

43/

24..using heat, e.g. steam injection (heating, cooling or insulating wells E21B 36/00)

43/

241...combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale  [5]

43/

243...Combustion in situ  [3]

43/

247....in association with fracturing processes  [3]

43/

248.....using explosives  [5]

43/

25.Methods for stimulating production (dump bailers E21B 27/02; vibration generating arrangements E21B 28/00)

43/

26..by forming crevices or fractures

43/

263...using explosives  [3]

43/

267...reinforcing fractures by propping  [3]

43/

27...by use of eroding chemicals, e.g. acids

43/

28.Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B 43/241 takes precedence)  [5]

43/

285.Melting minerals, e.g. sulfur (E21B 43/24 takes precedence; heating, cooling or insulating arrangements for wells E21B 36/00)  [5]

43/

29.Obtaining a slurry of minerals, e.g. by using nozzles  [5]

43/

295.Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B 43/243 takes precedence)  [5]

43/

30.Specific pattern of wells, e.g. optimizing the spacing of wells (production satellite stations E21B 43/017)  [3]

43/

32.Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells  [3]

43/

34.Arrangements for separating materials produced by the well (separating apparatus per se, see the relevant subclasses)  [3]

43/

36..Underwater separating arrangements (E21B 43/38 takes precedence)  [3]

43/

38..in the well  [3]

43/

40..Separation associated with re-injection of separated materials  [3]


Automatic control; Surveying or testing  [3]


44/

00Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems (for non-automatic drilling control, see the operation controlled; automatic feeding from rack and connecting of drilling pipes E21B 19/20; controlling pressure or flow of drilling fluid E21B 21/08); Systems specially adapted for monitoring a plurality of drilling variables or conditions (means for transmitting measuring-signals from the well to the surface E21B 47/12) [3]

 

44/

02.Automatic control of the tool feed (E21B 44/10 takes precedence) [7]

44/

04..in response to the torque of the drive [7]

44/

06..in response to the flow or pressure of the motive fluid of the drive [7]

44/

08..in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil [7]

 

44/

10.Arrangements for automatic stopping when the tool is lifted from the working face [7]


Surveying or testing


45/

00Measuring the drilling time or rate of penetration


47/

00Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B 21/08; geophysical logging G01V)

47/

01.Devices for supporting measuring instruments on a drill pipe, rod or wireline (setting or locking tools in boreholes or wells E21B 23/00); Protecting measuring instruments in boreholes against heat, shock, pressure or the like  [6]

47/

02.Determining slope or direction (clinometers or direction meters G01C)

47/

022..of the borehole

47/

024..of devices in the borehole (E21B 47/022 takes precedence)

47/

026..of penetrated ground layers (apparatus for obtaining oriented cores E21B 25/16; formation testing E21B 49/00)

47/

04.Measuring depth or liquid level (measuring liquid level in general G01F)

47/

06.Measuring temperature or pressure (measuring temperature in general G01K; measuring pressure in general G01L)

47/

08.Measuring diameter (measuring diameter in general G01B)

47/

09.Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes (measuring depth E21B 47/04; measuring diameter E21B 47/08)  [3]

47/

10.Locating fluid leaks, intrusions, or movements

47/

12.Means for transmitting measuring-signals from the well to the surface, e.g. for logging while drilling (remote signalling in general G08)

47/

14..using acoustic waves  [6]

47/

16...through the drill string or casing  [6]

47/

18...through the well fluid  [6]


49/

00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells (sampling in general G01N 1/00)

49/

02.by mechanically taking samples of the soil (apparatus for obtaining undisturbed cores E21B 25/00; investigation of foundation soil in situ E02D 1/00)

49/

04..using explosives in boreholes; using projectiles penetrating the wall  [3]

49/

06..using side-wall drilling tools or scrapers

49/

08.Obtaining fluid samples or testing fluids, in boreholes or wells  [3]

49/

10..using side-wall fluid samplers or testers  [3]


  E21B 11/00 - E21B 25/18   
 

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