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CPC
COOPERATIVE PATENT CLASSIFICATION
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E21B
EARTH DRILLING, e.g. DEEP 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
WARNING
-
The following IPC groups are not used in the CPC scheme. Subject matter covered by these groups is classified in the following CPC groups:
E21B1/12 to E21B1/38 covered by E21B 1/00
E21B7/08 covered by E21B 7/06
E21B11/04 covered by E21B 27/00
E21B23/12 covered by E21B 23/00D
E21B31/08 covered by E21B 27/00
E21B43/22 covered by C09K 8/58

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Guide Heading:
Methods or apparatus for drilling
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E21B 1/00
Percussion drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B)
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E21B 1/02
.
Surface drives for percussion drilling
E21B 1/04
. .
Devices for reversing the movement of the rod or cable at the surface
{
not used, see E21B 1/02
}
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E21B 3/00
Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B)
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E21B 3/02
.
Surface drives for rotary drilling
E21B 3/025
. .
with a to-and-fro rotation of the tool
E21B 3/03
. .
with an intermittent unidirectional rotation of the tool
E21B 3/035
. .
with slipping or elastic transmission
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E21B 3/04
. .
Rotary tables
{
(portable drilling rigs with rotary tables E21B 7/021)
}
E21B 3/045
. . .
{
movably mounted on the drilling structure or platform (derricks adapted to be moved on their substructure E21B 15/003; specially adapted for underwater drilling, E21B 15/02)
}
E21B 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)
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E21B 4/00
Drives used in the borehole
E21B 4/003
.
{
Bearing, sealing, lubricating details (for roller bits E21B 10/22; bearings in general F16C; sealing in general F16J; lubricating in general F16N)
}
E21B 4/006
.
{
Mechanical motion converting means, e.g. reduction gearings (E21B 4/10 takes precedence; gearings in general F16H)
}
E21B 4/02
.
Fluid rotary type drives (hydraulic turbines for drilling wells F03B 13/02)
E21B 4/04
.
Electric drives (E21B 4/12 takes precedence)
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E21B 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)
E21B 4/08
. .
impact being obtained by gravity only, e.g. with lost-motion connection
E21B 4/10
. .
continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
E21B 4/12
. .
Electrically operated hammers
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E21B 4/14
. .
Fluid operated hammers
E21B 4/145
. . .
{
of the self propelled-type, e.g. with a reverse mode to retract the device from the hole
}
E21B 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
E21B 4/18
.
Anchoring or feeding in the borehole
E21B 4/20
.
combined with surface drive (E21B 4/10 takes precedence)
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E21B 6/00
Drives for combined percussion and rotary drilling (drives used in the borehole E21B 4/00)
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E21B 6/02
.
the rotation being continuous
E21B 6/04
. .
Separate drives for percussion and rotation
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E21B 6/06
.
the rotation being intermittent, e.g.obtained by ratchet device
E21B 6/08
. .
Separate drives for percussion and rotation
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E21B 7/00
Special methods or apparatus for drilling
E21B 7/001
.
{
Drilling a non circular hole (excavating trenches E02F 5/02; cutting machines for slitting E21C 25/00)
}
E21B 7/002
.
{
Drilling with diversely driven shafts extending into the borehole (simultaneously drilling and casing E21B 7/20; plural down-hole drives E21B 4/16; E21B 7/001 takes precedence)
}
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E21B 7/003
.
{
Drilling with mechanical conveying means (bailers, e.g. baskets, buckets E21B 27/00; tunnelling E21D)
}
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E21B 7/005
. .
{
with helical conveying means (E21B 7/201 takes precedence; augers E21B 10/44; drilling rods or pipes with helical structure E21B 17/22)
}
E21B 7/006
. . .
{
combined with a bucket-type container (bailers with helical conveying means E21B 27/04)
}
E21B 7/007
.
{
Drilling by use of explosives (underwater drilling using explosives E21B 7/1245; setting-tools actuated by explosives E21B 23/04, E21B 23/065; cutting or destroying objects in boreholes by explosives E21B 29/02; freeing objects using explosives 31/107B; gun or shaped-charge perforators E21B 43/116; fracturing by explosives E21B 43/263, E21B 43/248; taking samples using explosives E21B 49/04)
}
E21B 7/008
.
{
Drilling ice or a formation covered by ice
}
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E21B 7/02
.
Portable drilling rigs, truck-or skid-mounted, with their own drive (portable drilling rigs for use on underwater floors E21B 7/124)
E21B 7/021
. .
{
With a rotary table, i.e a fixed rotary drive for a relatively advancing tool (rotary tables E21B 3/04)
}
E21B 7/022
. .
{
Control of the drilling operation; Hydraulic or pneumatic means for activation or operation (control circuits for drilling masts E21B 15/045)
}
E21B 7/023
. .
{
the mast being foldable or telescopically retractable
}
E21B 7/024
. .
{
having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling
}
E21B 7/025
. .
{
Rock drills, i.e. jumbo drills
}
E21B 7/026
. .
{
having auxiliary platforms, e.g. for observation purposes
}
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E21B 7/027
. .
{
Drills for drilling shallow holes, e.g. for taking soil samples or for drilling postholes
}
E21B 7/028
. . .
{
the drilling apparatus being detachable from the vehicle, e.g. hand portable drills
}
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E21B 7/04
.
Directional drilling (derricks or masts specially adapted therefor E21B 15/04)
E21B 7/043
. .
{
for underwater installations
}
E21B 7/046
. .
{
horizontal drilling (drilling with mechanical conveying means E21B 7/003)
}
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E21B 7/06
. .
Deflecting the direction of boreholes
{
(directional window cutting E21B 29/06; deflecting the direction of fishing tools E21B 31/14)
}
E21B 7/061
. . .
{
the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
}
E21B 7/062
. . .
{
the tool shaft rotating inside a non-rotating guide travelling with the shaft (E21B 7/067 and E21B 7/068 take precedence)
}
E21B 7/064
. . .
{
specially adapted drill bits therefor
}
E21B 7/065
. . .
{
using oriented fluid jets
}
E21B 7/067
. . .
{
with means for locking sections of a pipe or of a guide for a shaft in angular relation, e.g. adjustable bent sub
}
E21B 7/068
. . .
{
drilled by a down-hole drilling motor (down-hole drives per se E21B 4/00, E21B 7/067 takes precedence)
}
E21B 7/10
. .
Correction of deflected boreholes
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E21B 7/12
.
Underwater drilling (derricks or masts specially adapted therefor E21B 15/02; telescoping joints E21B 17/07; using heave compensators E21B 19/09)
E21B 7/122
. .
{
with submersible vertically movable guide
}
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E21B 7/124
. .
with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors
E21B 7/1245
. . .
{
using explosive means (Anchors driven in by explosive charges B63B 21/28)
}
E21B 7/128
. .
from floating support with independent underwater anchored guide base
{
guide line systems E21B33/035F
}
E21B 7/132
. .
from underwater buoyant support
E21B 7/136
. .
from non-buoyant support (E21B 7/124 takes precedence)
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E21B 7/14
.
Drilling by use of heat, e.g. flame drilling
{
(by use of explosives E21B 7/007)
}
E21B 7/143
. .
{
underwater
}
E21B 7/146
. .
{
Thermal lances
}
E21B 7/15
. .
of electrically generated heat
E21B 7/16
.
Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
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E21B 7/18
.
Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence;
{
obtaining a slurry of minerals E21B 43/29
}
; hydraulic monitors E21C 45/00)
E21B 7/185
. .
{
underwater
}
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E21B 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;
{
pushing means outside of the borehole E21B 19/08;
}
 placing piles E02D 7/00; sinking shafts while moving the lining downwards E21D 1/08;
{
making galleries by forcing prefabricated elements through the ground E21D 9/005
}
)
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E21B 7/201
. .
{
with helical conveying means (drilling with helical conveying means E21B 7/005; augers E21B 10/44; drilling rods or pipes with helical structure E21B 17/22)
}
E21B 7/203
. . .
{
using down-hole drives (down-hole drives per se E21B 4/00)
}
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E21B 7/205
. .
{
without earth removal (E21B 7/30 takes precedence)
}
NOTE
-

Special methods or apparatus for drilling without earth removal E21B 7/26

E21B 7/206
. . .
{
using down-hole drives (down-hole drives per se E21B 4/00)
}
E21B 7/208
. .
{
using down-hole drives (down-hole drives per se E21B 4/00; E21B 7/203 and E21B 7/206 take precedence)
}
E21B 7/24
.
Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B 1/00)
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E21B 7/26
.
Drilling without earth removal, e.g. with self-propelled burrowing devices (
{
E21B 7/205 and
}
 E21B 7/30 take precedence; down-hole drives E21B 4/00,
{
e.g. self-propelled fluid-operated hammers E21B 4/145
}
)
E21B 7/265
. .
{
Combined with earth removal
}
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E21B 7/28
.
Enlarging drilled holes, e.g. by counterboring (drill bits for enlarging the borehole E21B 10/26)
E21B 7/30
. .
without earth removal
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Guide Heading:
Drilling tools
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E21B 10/00
Drill bits (specially adapted for deflecting the direction of boring E21B 7/064; with means for collecting substances E21B 27/00)
E21B 10/003
.
{
with cutting edges facing in opposite axial directions
}
E21B 10/006
.
{
providing a cutting edge which is self-renewable during drilling
}
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E21B 10/02
.
Core bits (characterised by wear resisting parts E21B 10/46; obtaining undisturbed cores E21B 25/00)
E21B 10/04
. .
with core destroying means
E21B 10/06
. .
Roller core bits
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E21B 10/08
.
Roller bits (roller core bits E21B 10/06; with leading portion E21B 10/26; characterised by wear resisting parts E21B 10/46)
E21B 10/083
. .
{
with longitudinal axis, e.g. wobbling or nutating roller bit (longitudinal axis roller reamers E21B 10/30)
}
E21B 10/086
. .
{
with excentric movement
}
E21B 10/10
. .
with roller axle supported at both ends (with disc-cutters E21B 10/12)
E21B 10/12
. .
with discs cutters
E21B 10/14
. .
combined with non-rolling cutters other than of leading-portion type
E21B 10/16
. .
characterised by tooth form or arrangement
E21B 10/18
. .
characterised by conduits or nozzles for drilling fluids (drilling fluid supply to the bearings E21B 10/23)
E21B 10/20
. .
characterised by detachable or adjustable parts, e.g. legs or axles (cross axle roller bits E21B 10/10)
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E21B 10/22
. .
characterised by bearing, lubrication or sealing details
E21B 10/23
. . .
with drilling fluid supply to the bearings
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E21B 10/24
. . .
characterised by lubricating details
E21B 10/246
. . . .
{
with pumping means for feeding lubricant
}
E21B 10/25
. . .
characterised by sealing details
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E21B 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)
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E21B 10/28
. .
with non-expansible roller cutters
E21B 10/30
. . .
Longitudinal axis roller reamers, e.g. reamer stabilisers
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E21B 10/32
. .
with expansible cutting tools
E21B 10/322
. . .
{
cutter shifted by fluid pressure (E21B 10/345 takes precedence)
}
E21B 10/325
. . .
{
the cutter being shifted by a spring mechanism
}
E21B 10/327
. . .
{
the cutter being pivoted about a longitudinal axis (E21B 10/34 takes precedence)
}
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E21B 10/34
. . .
of roller-cutter type
E21B 10/345
. . . .
{
cutter shifted by fluid pressure
}
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E21B 10/36
.
Percussion drill bits (characterised by wear resisting parts E21B 10/46)
{
with helical conveying portion E21B 10/445
}
E21B 10/38
. .
characterised by conduits or nozzles for drilling fluids
E21B 10/40
. .
with leading portion
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E21B 10/42
.
Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B 10/54, by conduits or nozzles for drilling fluid E21B 10/60, by detachable or adjustable parts E21B 10/62)
E21B 10/43
. .
characterised by the arrangement of teeth or other cutting elements
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E21B 10/44
.
Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts (
{
Rotary drag type drill bits E21B 10/42
}
; drilling rods with helical structure E21B 17/22)
E21B 10/445
. .
{
percussion type, e.g. for masonry (percussion drill bits in general E21B 10/36)
}
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E21B 10/46
.
characterised by wear resisting parts, e.g. diamond inserts
{
(drill bits with self-renewable cutting edge E21B 10/006)
}
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E21B 10/48
. .
the bit being of core type
{
(saw cylinders having their cutting rim equipped with abrasive particles for drilling stone or glass B28D 1/041)
}
E21B 10/485
. . .
{
with inserts in form of chisels, blades or the like
}
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E21B 10/50
. .
the bit being of roller type
E21B 10/52
. . .
with chisel or button type inserts
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E21B 10/54
. .
the bit being of the rotary drag type, e.g. fork-type bits
E21B 10/55
. . .
with preformed cutting elements
{
with blades having preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
}
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E21B 10/56
. .
Button type inserts (E21B 10/52 takes precedence)
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E21B 10/567
. . .
with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
E21B 10/5673
. . . .
{
having a non planar or non circular cutting face (E21B10/571 takes precedence)
}
E21B 10/5676
. . . .
{
having a cutting face with different segments, e.g. mosaic-type inserts
}
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E21B 10/573
. . . .
characterised by support details
E21B 10/5735
. . . . .
{
Interface between the substrate and the cutting element
}
E21B 10/58
. .
Chisel type inserts (
{
E21B 10/485,
}
 E21B 10/52, E21B 10/54 take precedence)
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E21B 10/60
.
characterised by conduits or nozzles for drilling fluids (for roller bits E21B 10/18; for percussion drill bits E21B 10/38;
{
mining picks with arrangement of fluid-spraying nozzles E21C 35/187
}
)
E21B 10/602
. .
{
the bit being a rotary drag type bit with blades
}
E21B 10/605
. .
{
the bit being a core-bit
}
E21B 10/61
. .
characterised by the nozzle structure
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E21B 10/62
.
characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B 10/64 takes precedence; for roller bits E21B 10/20;
{
for rotary drag type drill bits E21B 10/42
}
; for augers E21B 10/44)
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E21B 10/627
. .
with plural detachable cutting elements
E21B 10/633
. . .
independently detachable
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E21B 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)
E21B 10/66
. .
the cutting element movable through the drilling pipe and laterally shiftable
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E21B 11/00
Other drilling tools
{
(boring grabs E21B 27/00)
}
E21B 11/005
.
{
Hand operated drilling tools
}
E21B 11/02
.
Boring rams (percussion drives used in the borehole E21B 4/06; percussion drill bits E21B 10/36)
E21B 11/06
.
with driven cutting chains or similarly driven tools
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E21B 12/00
Accessories for drilling tools
{
(connecting and disconnecting drill bit and drilling pipe E21B 19/18; sharpening stone drill bits B24B 3/33)
}
E21B 12/02
.
Wear indicators
E21B 12/04
.
Drill bit protectors
E21B 12/06
.
Mechanical cleaning devices
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Guide Heading:
Other equipment or details for drilling; Well equipment or well maintenance
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E21B 15/00
Derricks; Masts;
{
Other supports (drill rigs with movable understructures E21B 7/02)
}
E21B 15/003
.
{
adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells (slant-hole rigs E21B 15/04)
}
E21B 15/006
.
{
Means for anchoring the drilling machine to the ground
}
E21B 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;
{
with skidding means E21B 15/003
}
)
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E21B 15/04
.
specially adapted for directional drilling, e.g. slant hole rigs
{
(with skidding means E21B 15/003)
}
E21B 15/045
. .
{
Hydraulic, pneumatic or electric circuits for their positioning
}
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E21B 17/00
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods;
{
Cables
}
; Casings; Tubings (rod couplings in general F16D; tubes or tube couplings in general F16L)
E21B 17/003
.
{
with electrically conducting or insulating means (E21B 17/028 and E21B 17/023 take precedence)
}
E21B 17/006
.
{
Accessories for drilling pipes, e.g. cleaners (wear protectors E21B 17/10; handling drilling pipes E21B 19/00; thread protectors B65D 59/00)
}
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E21B 17/01
.
Risers (
{
connections between riser sectionsE21B 17/085; supporting a riser from a drilling or production platformE21B 19/004
}
; riser connectors
{
on well heads
}
E21B 33/038)
E21B 17/012
. .
{
with buoyancy elements (E21B 17/015 takes precedence)
}
E21B 17/015
. .
{
Non-vertical risers, e.g. articulated or catenary-type
}
E21B 17/017
. .
{
Bend restrictors for limiting stress on risers
}
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E21B 17/02
.
Couplings; joints
{
Expandable couplings or joints E21B 43/106
}
E21B 17/021
. .
{
Devices for subsurface connecting or disconnecting by rotation (connecting or disconnecting pipe couplings or joints E21B 19/16; fishing tools for frozen rods, casings, ropes, bits or the like E21B 31/00)
}
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E21B 17/023
. .
{
Arrangements for connecting cables or wirelines to downhole devices
}
E21B 17/025
. . .
{
Side entry subs
}
E21B 17/026
. . .
{
Arrangements for fixing cables or wirelines to the outside of downhole devices (protectors and centralisers for cables and control lines E21B 17/10D)
}
E21B 17/028
. .
{
Electrical or electro-magnetic connections
}
E21B 17/03
. .
between drilling rod or pipe and drill motor, e.g. between drilling rod and hammer
Collapse
E21B 17/04
. .
between rod
{
or the like
}
 and bit or between rod and rod
{
or the like
}
Collapse
E21B 17/042
. . .
threaded
{
(readily releasing joints E21B 17/06)
}
E21B 17/0423
. . . .
{
with plural threaded sections, e.g. with two-step threads
}
E21B 17/0426
. . . .
{
with a threaded cylindrical portion, e.g. for percussion rods
}
E21B 17/043
. . . .
with locking means
E21B 17/046
. . .
with ribs, pins or jaws, and complementary grooves or the like, e.g. bayonet catches
E21B 17/05
. . .
Swivel joints
E21B 17/06
. . .
Releasing-joints, e.g. safety joints
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E21B 17/07
. . .
Telescoping joints for varying drill string lengths; Shock absorbers (heave compensators in the derrick E21B 19/09; releasing-jars E21B 31/107;
{
shock-absorbers in general F16F
}
)
E21B 17/073
. . . .
{
with axial rotation
}
E21B 17/076
. . . .
{
between rod or pipe and drill bit
}
Collapse
E21B 17/08
. .
Casing joints
E21B 17/085
. . .
{
Riser connections (connectors for wellhead E21B 33/038)
}
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E21B 17/10
.
Wear protectors; Centralising devices,
{
e.g. stabilisers
}
(drives used in the borehole with anchoring means E21B 4/18; guiding or centralising devices outside the borehole E21B 19/24)
E21B 17/1007
. .
{
for the internal surface of a pipe, e.g. wear bushings for underwater well-heads
}
Collapse
E21B 17/1014
. .
{
Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well (E21B 17/1042 takes precedence)
}
Collapse
E21B 17/1021
. . .
{
with articulated arms or arcuate springs (measuring the diameter E21B 47/08)
}
E21B 17/1028
. . . .
{
with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations
}
E21B 17/1035
. .
{
for plural rods, pipes or lines, e.g. for control lines
}
Collapse
E21B 17/1042
. .
{
Elastomer protector or centering means
}
E21B 17/105
. . .
{
split type
}
Collapse
E21B 17/1057
. .
{
Centralising devices with rollers or with a relatively rotating sleeve (E21B 17/1014 takes precedence)
}
E21B 17/1064
. . .
{
Pipes or rods with a relatively rotating sleeve
}
E21B 17/1071
. .
{
specially adapted for pump rods, e.g. sucker rods
}
E21B 17/1078
. .
{
Stabilisers or centralisers for casing, tubing or drill pipes (devices for off-center positioning E21B 17/10; E21B 17/1007 to E21B 17/1064 take precedence)
}
E21B 17/1085
. .
{
Wear protectors; Blast joints; Hard facing (wear protection included in centralising devices, see relevant subgroups)
}
E21B 17/1092
. .
{
Gauge section of drill bits
}
E21B 17/12
. .
Devices for placing or drawing out wear protectors
E21B 17/14
.
Casing shoes
{
for the protection of the bottom of the casing
}
E21B 17/16
.
Drill collars
E21B 17/18
.
Pipes provided with plural fluid passages (
{
E21B 17/203 takes precedence;
}
 circulation of drilling fluid by means of such pipes E21B 21/12;
{
general F16L 39/00
}
)
Collapse
E21B 17/20
.
Flexible or articulated drilling pipes,
{
e.g. flexible or articulated rods, pipes or cables (risers E21B 17/01; swivel joints E21B 17/05)
}
E21B 17/203
. .
{
with plural fluid passages
}
E21B 17/206
. .
{
with conductors, e.g. electrical, optical (hoses with electrically conducting means in general F16L 11/127)
}
E21B 17/22
.
Rods or pipes with helical structure (drill bits with helical conveying portion E21B 10/44)
Collapse
E21B 19/00
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick (surface drives E21B 1/02, E21B 3/02)
Collapse
E21B 19/002
.
{
specially adapted for underwater drilling (E21B 19/09, E21B 19/143 take precedence; risers with buoyancy elements E21B 17/012, E21B 17/015)
}
Collapse
E21B 19/004
. .
{
supporting a riser from a drilling or production platform
}
E21B 19/006
. . .
{
including heave compensators
}
E21B 19/008
.
{
Winding units, specially adapted for drilling operations (capstans, winches B66D; cathead actuated pipe wrenches or spinners E21B 19/162)
}
Collapse
E21B 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)
E21B 19/04
. .
Hooks
Collapse
E21B 19/06
. .
Elevators, i.e. rod or tube gripping devices
E21B 19/07
. . .
Slip-type elevators (slips E21B 19/10)
Collapse
E21B 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
E21B 19/081
. .
Screw-and-nut feed mechanisms
E21B 19/083
. .
Cam, rack or like feed mechanisms
E21B 19/084
. .
with flexible drawing means, e.g. cables
E21B 19/086
. .
with a fluid-actuated cylinder (E21B 19/084, E21B 19/087, E21B 19/09 take precedence)
E21B 19/087
. .
by means of a swinging arm
E21B 19/089
. .
with a spring or an additional weight
E21B 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;
{
heave compensators for supporting a riser E21B 19/006
}
)
E21B 19/10
.
Slips; Spiders;
{
Catching devices (rotary tables with master bushing or kelly bushing E21B 3/04; slip-type elevators E21B 19/07; casing heads with slips E21B 33/0422)
}
E21B 19/12
.
Rope clamps (rope clamps in general F16G 11/00)
{
rod, casings or tube clamps not secured to elevators
}
Collapse
E21B 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;
{
storing elongated articles in general B65G 1/0442
}
)
E21B 19/143
. .
{
specially adapted for underwater drilling
}
E21B 19/146
. .
{
Carousel systems, i.e. rotating rack systems
}
Collapse
E21B 19/15
. .
Racking of rods in horizontal position; Handling between horizontal and vertical position
E21B 19/155
. . .
{
Handling between horizontal and vertical position
}
Collapse
E21B 19/16
.
Connecting or disconnecting pipe couplings or joints (E21B 19/20 takes precedence; Pipe wrenches or the like B25B)
Collapse
E21B 19/161
. .
{
using a wrench or a spinner adapted to engage a circular section of pipe (E21B 19/168 takes precedence)
}
E21B 19/162
. . .
{
cathead actuated
}
E21B 19/163
. . .
{
piston-cylinder actuated
}
E21B 19/164
. . .
{
motor actuated (E21B 19/162 and E21B 19/163 take precedence)
}
Collapse
E21B 19/165
. .
{
Control or monitoring arrangements therefor
}
E21B 19/166
. . .
{
Arrangements of torque limiters or torque indicators
}
E21B 19/167
. .
{
using a wrench adapted to engage a non circular section of pipe, e.g. a section with flats or splines
}
E21B 19/168
. .
{
using a spinner with rollers or a belt adapted to engage a well pipe
}
E21B 19/18
.
Connecting or disconnecting drill bit and drilling pipe
E21B 19/20
.
Combined feeding from rack and connecting, e.g. automatically
E21B 19/22
.
Handling reeled pipe or rod units, e.g. flexible drilling pipes
{
(lifting or hauling appliances using two or more cooperating endless chains B66D 3/003)
}
E21B 19/24
.
Guiding or centralising devices for drilling rods or pipes
Collapse
E21B 21/00
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 8/02)
E21B 21/001
.
{
specially adapted for underwater drilling
}
E21B 21/002
.
{
Down-hole drilling fluid separation systems (containers comprising collecting means with a strainer E21B 27/005; subsoil filtering E21B 43/02; down-hole production separators E21B 43/38)
}
E21B 21/003
.
{
Means for stopping loss of drilling fluid (plastering the borehole wall E21B 33/138)
}
Collapse
E21B 21/01
.
Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes (
{
swivel joints in hose-lines E21B 21/02;
}
 arrangements for treating drilling fluids E21B 21/06;
{
waste disposal systems E21B 41/005
}
)
E21B 21/012
. .
{
using exhaust air from the drilling motor for blowing off the dust at the borehole entrance
}
E21B 21/015
. .
Means engaging the bore entrance, e.g. hoods for collecting dust
E21B 21/02
.
Swivel joints in hose-lines
{
(hose connections in general F16L 31/00, F16L 33/00)
}
Collapse
E21B 21/06
.
Arrangements for treating drilling fluids outside the borehole (treating steps per se, see the relevant subclasses)
E21B 21/062
. .
{
by mixing components
}
Collapse
E21B 21/063
. .
{
by separating components
}
Collapse
E21B 21/065
. . .
{
Separating solids from drilling fluids
}
E21B 21/066
. . . .
{
with further treatment of the solids, e.g. for disposal
}
E21B 21/067
. . .
{
Separating gases from drilling fluids
}
E21B 21/068
. .
{
using chemical treatment
}
E21B 21/07
. .
for treating dust-laden gaseous fluids
E21B 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)
Collapse
E21B 21/10
.
Valve arrangements in drilling fluid circulation systems (valves in general F16K)
E21B 21/103
. .
{
Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
}
E21B 21/106
. .
{
Valve arrangements outside the borehole, e.g. kelly valves
}
E21B 21/12
.
using drilling pipes with plural fluid passages, e.g. closed circulation systems (pipes with plural fluid passages E21B 17/18)
E21B 21/14
.
using liquids and gases, e.g. foams
E21B 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)
E21B 21/18
.
Preventing exhaust air from the drill motor from blowing-off towards the working face
Collapse
E21B 23/00
Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells (setting of casings, screens or liners E21B 43/10)
E21B 23/002
.
{
Tool diverters, e.g. for through-the-flow line tool systems or for wire-line tools (E21B 23/03 takes precedence; for drilling E21B 7/06)
}
Collapse
E21B 23/004
.
{
Indexing systems for guiding relative movement between telescoping parts of downhole tools
}
E21B 23/006
. .
{
"J-slot" systems, i.e. lug and slot indexing mechanisms
}
E21B 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;
{
packers E21B 33/12
}
)
E21B 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)
E21B 23/03
.
for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets
E21B 23/04
.
operated by fluid means, e.g. actuated by explosion (E21B 23/06, E21B 23/08 take precedence)
Collapse
E21B 23/06
.
for setting packers
E21B 23/065
. .
{
setting tool actuated by explosion or gas generating means
}
Collapse
E21B 23/08
.
Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems (
{
tool diverters E21B 23/002
}
; special provisions on heads therefor E21B 33/068; cementing plugs E21B 33/16; scrapers operated by fluid pressure E21B 37/04)
E21B 23/10
. .
Tools specially adapted therefor
E21B 23/14
.
for displacing a cable or cable-operated tool, e.g. for logging or perforating operations in deviated wells (
{
side entry sub E21B17/02D; control line protectors E21B 17/1035
}
; by fluid pressure E21B 23/08; provision on well heads for introducing or removing cable-operated tools E21B 33/072, E21B 33/076)
Collapse
E21B 25/00
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)
E21B 25/005
.
{
Above ground means for handling the core, e.g. for extracting the core from the core barrel
}
Collapse
E21B 25/02
.
the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe (retrievable drill bits E21B 10/64)
E21B 25/04
. .
the core receiver having a core forming cutting edge or element, e.g punch type core barrels
E21B 25/06
.
the core receiver having a flexible liner or inflatable retaining means
E21B 25/08
.
Coating, freezing, consolidating cores (E21B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure
Collapse
E21B 25/10
.
Formed core retaining or severing means (E21B 25/06, E21B 25/08 take precedence)
E21B 25/12
. .
of the sliding wedge type
E21B 25/14
. .
mounted on pivot transverse to core axis
E21B 25/16
.
for obtaining oriented cores
E21B 25/18
.
the core receiver being specially adapted for operation under water
Collapse
E21B 27/00
Containers for collecting or depositing substances in boreholes or wells, e.g. bailers,
{
baskets or buckets
}
 for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
E21B 27/005
.
{
Collecting means with a strainer
}
E21B 27/02
.
Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
E21B 27/04
.
where the collecting or depositing means including helical conveying means
{
drilling with helical conveying means combined with bucket-type container E21B 7/006
}
E21B 28/00
Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for drilling E21B 7/24;
{
for fishing for or freeing objects E21B 31/005
}
; for transmitting measuring-signals E21B 47/14; for geophysical measurements G01V 1/02)
WARNING
-
Group E21B 28/00 is not complete. See also E21B 43/003

Collapse
E21B 29/00
Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows(perforatorsE21B 43/11); Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
{
(by enlarging drilled holes or counterboringE21B 7/28)
}
Collapse
E21B 29/002
.
{
Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
}
E21B 29/005
. .
{
with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window
}
E21B 29/007
. .
{
with a radially-retracting cutter rotating outside the pipe
}
E21B 29/02
.
by explosives or by thermal or chemical means (
{
freeing stuck objects by explosives E21B 31/002
}
; destroying objects in boreholes or wells by explosives E21B 31/16)
E21B 29/04
.
Cutting of wire lines or the like (E21B 29/02 takes precedence)
E21B 29/06
.
Cutting windows, e.g. directional window cutters for whipstock operations (
{
E21B 29/005 and
}
 E21B 29/08 take precedence
{
(whipstocks E21B 7/061)
}
)
E21B 29/08
.
Cutting or deforming pipes to control fluid flow (shear type blow-out preventers E21B 33/063)
E21B 29/10
.
Reconditioning of well casings, e.g. straightening
E21B 29/12
.
specially adapted for underwater installations (E21B 29/08 takes precedence)
Collapse
E21B 31/00
Fishing for or freeing objects in boreholes or wells (
{
using junk baskets or the like E21B 27/00
}
; 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)
E21B 31/002
.
{
Destroying the objects to be fished, e.g. by explosive means (cutting by explosives E21B 29/02)
}
E21B 31/005
.
{
using vibrating or oscillating means (vibration generating arrangements for boreholes or wells E21B 28/00)
}
E21B 31/007
.
{
fishing tools with means for attaching comprising fusing or sticking
}
E21B 31/03
.
Freeing by flushing;
{
Controlling differential pipe sticking
}
E21B 31/06
.
using magnetic means
Collapse
E21B 31/107
.
using impact means for releasing stuck parts, e.g. jars (telescoping joints E21B 17/07)
E21B 31/1075
. .
{
using explosives
}
Collapse
E21B 31/113
. .
hydraulically-operated
E21B 31/1135
. . .
{
Jars with a hydraulic impedance mecanism, i.e. a restriction, for initially delaying escape of a restraining fluid
}
Collapse
E21B 31/12
.
Grappling tools, e.g. tongs or grabs
E21B 31/125
. .
{
specially adapted for parted wire line or ropes
}
E21B 31/14
. .
with means deflecting the direction of the tool, e.g. by use of knuckle joints (apparatus for deflecting the boring E21B 7/06)
E21B 31/16
. .
combined with cutting or destroying means (cutting or destroying means per se E21B 29/00)
E21B 31/18
. .
gripping externally, e.g. overshot
E21B 31/20
. .
gripping internally, e.g. fishing spears
Collapse
E21B 33/00
Sealing or packing boreholes or wells
Collapse
E21B 33/02
.
Surface sealing or packing
Collapse
E21B 33/03
. .
Well heads; Setting-up thereof (valve arrangements therefor E21B 34/02)
Collapse
E21B 33/035
. . .
specially adapted for underwater installations (E21B 33/043, E21B 33/064, E21B 33/076 take precedence)
E21B 33/0355
. . . .
{
Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads
}
Collapse
E21B 33/037
. . . .
Protective housing therefor
E21B 33/0375
. . . . .
{
Corrosion protection means (in general C23F)
}
Collapse
E21B 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)
E21B 33/0385
. . . . .
{
electrical connectors (underwater electrical connections in general H01R 13/523)
}
Collapse
E21B 33/04
. . .
Casing heads; Suspending casings or tubings in well heads (setting of casings in wells E21B 43/10)
E21B 33/0407
. . . .
{
with a suspended electrical cable
}
E21B 33/0415
. . . .
{
rotating or floating support for tubing or casing hanger
}
E21B 33/0422
. . . .
{
a suspended tubing or casing being gripped by a slip or an internally serrated member (slips in rotary table E21B 19/10)
}
E21B 33/043
. . . .
specially adapted for underwater well heads (
{
E21B 33/0407,
}
 E21B 33/047 take precedence)
E21B 33/047
. . . .
for plural tubing strings
E21B 33/05
. . . .
Cementing-heads, e.g. having provision for introducing cementing plugs
Collapse
E21B 33/06
. . .
Blow-out preventers,
{
i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers (rotating blow-out preventers E21B 33/085; valves E21B 34/00)
}
Collapse
E21B 33/061
. . . .
{
Ram-type blow-out preventers, e.g. with pivoting rams
}
Collapse
E21B 33/062
. . . . .
{
with sliding rams
}
E21B 33/063
. . . . . .
{
for shearing drill pipes (cutting of wireline E21B 29/04; cutting pipes E21B 29/08)
}
E21B 33/064
. . . .
specially adapted for underwater well heads (connectors therefor E21B 33/038;
{
control systems for submerged well-heads E21B 33/0355
}
)
Collapse
E21B 33/068
. . .
having provision for introducing objects or fluids into, or removing objects from, wells (cementing heads E21B 33/05;
{
wipers, oil savers E21B 33/08
}
)
E21B 33/072
. . . .
for cable-operated tools (E21B 33/076 takes precedence)
E21B 33/076
. . . .
specially adapted for underwater installations
Collapse
E21B 33/08
. .
Wipers; Oil savers
E21B 33/085
. . .
{
Rotatable packing means, e.g. rotating blow-out preventers
}
Collapse
E21B 33/10
.
in the borehole
{
sealing the junction between main bore and laterals E21B 41/0042
}
Collapse
E21B 33/12
. .
Packers; Plugs (
{
locking packers or plugs in landing nipples E21B 23/02
}
; used for cementing E21B 33/134, E21B 33/16)
E21B 33/1204
. . .
{
permanent; drillable
}
Collapse
E21B 33/1208
. . .
{
characterised by the construction of the sealing or packing means (E21B 33/1277 takes precedence)
}
E21B 33/1212
. . . .
{
including a metal-to-metal seal element
}
E21B 33/1216
. . . .
{
Anti-extrusion means, e.g. means to prevent cold flow of rubber packing
}
E21B 33/122
. . .
Multiple string packers
Collapse
E21B 33/124
. . .
Units with longitudinally-spaced plugs for isolating the intermediate space
Collapse
E21B 33/1243
. . . .
{
with inflatable sleeves
}
E21B 33/1246
. . . . .
{
inflated by down-hole pumping means operated by a pipe string
}
Collapse
E21B 33/126
. . .
with fluid-pressure-operated elastic cup or skirt (E21B 33/122, E21B 33/124 take precedence)
E21B 33/1265
. . . .
{
with mechanical slips
}
Collapse
E21B 33/127
. . .
with inflatable sleeve (E21B 33/122, E21B 33/124 take precedence)
E21B 33/1272
. . . .
{
inflated by down-hole pumping means operated by a pipe string
}
E21B 33/1275
. . . .
{
inflated by down-hole pumping means operated by a down-hole drive
}
E21B 33/1277
. . . .
{
characterised by the construction or fixation of the sleeve
}
Collapse
E21B 33/128
. . .
with a member expanded radially by axial pressure (E21B 33/122, E21B 33/124,
{
E21B 33/129
}
 take precedence;
{
characterised by the construction of the sealing means E21B 33/1208
}
)
E21B 33/1285
. . . .
{
by fluid pressure
}
Collapse
E21B 33/129
. . .
with mechanical slips for hooking into the casing (E21B 33/122, E21B 33/124 take precedence)
Collapse
E21B 33/1291
. . . .
{
anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks (E21B 33/1295 takes precedence)
}
E21B 33/1292
. . . . .
{
with means for anchoring against downward and upward movement
}
E21B 33/1293
. . . .
{
with means for anchoring against downward and upward movement (E21B 33/1291, E21B 33/1295 take precedence)
}
E21B 33/1294
. . . .
{
characterised by a valve, e.g. a by-pass valve
}
Collapse
E21B 33/1295
. . . .
actuated by fluid pressure
E21B 33/12955
. . . . .
{
using drag blocks frictionally engaging the inner wall of the well
}
Collapse
E21B 33/13
. .
Methods or devices for cementing, for plugging holes, crevices, or the like (dump bailers E21B 27/02;
{
methods or apparatus for grouting offshore structures E02B 17/0008
}
 chemical compositions therefor C09K 8/00)
E21B 33/134
. . .
Bridging plugs
{
(packers E21B 33/12)
}
E21B 33/136
. . .
Baskets, e.g. of umbrella type
E21B 33/138
. . .
Plastering the borehole wall; Injecting into the formations
{
(packers E21B 33/12; consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof E21B 43/02B, compositions therefor C09K 8/56)
}
Collapse
E21B 33/14
. . .
for cementing casings into boreholes
{
(using special cement compositions E21B33/13B; control of cementation quality or level E21B 47/0005)
}
E21B 33/143
. . . .
{
for underwater installations
}
E21B 33/146
. . . .
{
Stage cementing, i.e. discharging cement from casing at different levels
}
E21B 33/16
. . . .
using plugs for isolating cement charge; Plugs therefor
{
(spacer compositions E21B33/13B5; stage cementing E21B 33/146)
}
Collapse
E21B 34/00
Valve arrangements for boreholes or wells (in drilling fluid circulation systems E21B 21/10;
{
tool diverters E21B 23/002;
}
 blow-out preventers E21B 33/06; oil flow regulating apparatus E21B 43/12; valves in general F16K)
Collapse
E21B 34/02
.
in well heads
Collapse
E21B 34/04
. .
in underwater well heads
E21B 34/045
. . .
{
adapted to be lowered on a tubular string into position within a blow-out preventer stack, e.g. so-called test trees
}
Collapse
E21B 34/06
.
in wells
E21B 34/063
. .
{
Valve or closure with destructible element, e.g. frangible disc (E21B 34/103 takes precedence)
}
E21B 34/066
. .
{
electrically actuated
}
Collapse
E21B 34/08
. .
responsive to flow or pressure of the fluid obtained (E21B 34/10 takes precedence)
E21B 34/085
. . .
{
with time-delay systems, e.g. hydraulic impedance mechanisms
}
Collapse
E21B 34/10
. .
operated by control fluid supplied from above ground (
{
by a dropped ball or piston E21B 34/14;
}
 above-ground control means E21B 34/16)
E21B 34/101
. . .
{
with means for equalizing fluid pressure above and below the valve
}
Collapse
E21B 34/102
. . .
{
with means for locking the closing element inopen or closed position (E21B 34/105 and E21B 34/108 take precedence)
}
E21B 34/103
. . . .
{
with a shear pin
}
Collapse
E21B 34/105
. . .
{
retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
}
E21B 34/106
. . . .
{
the retrievable element being a secondary control fluid actuated valve landed into the bore of a first inoperative control fluid actuated valve
}
E21B 34/107
. . . .
{
the retrievable element being an operating or controlling means retrievable separately from the closure member, e.g. pilot valve landed into a side pocket (E21B 34/106 takes precedence)
}
E21B 34/108
. . .
{
with time delay systems, e.g. hydraulic impedance mechanisms
}
Collapse
E21B 34/12
. .
operated by movement of casings or tubings
E21B 34/125
. . .
{
with time delay systems, e.g. hydraulic impedance mechanisms
}
E21B 34/14
. .
operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
{
(E21B 34/066 takes precedence)
}
E21B 34/16
.
Above-ground control means therefor
{
(control systems for submerged well heads E21B 33/0355)
}
E21B 35/00
Methods 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)
Collapse
E21B 36/00
Heating, cooling, 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)
E21B 36/001
.
{
Cooling arrangements
}
E21B 36/003
.
{
Insulating arrangements
}
E21B 36/005
.
{
Heater surrounding production tube
}
E21B 36/006
.
{
Combined heating and pumping means
}
E21B 36/008
.
{
using chemical heat generating means
}
Collapse
E21B 36/02
.
using burners
E21B 36/025
. .
{
the burners being above ground or outside the bore hole
}
E21B 36/04
.
using electrical heaters
Collapse
E21B 37/00
Methods or apparatus for cleaning boreholes or wells (E21B 21/00 takes precedence;
{
bailers E21B 27/00;
}
 cleaning pipes in general B08B 9/02)
Collapse
E21B 37/02
.
Scrapers specially adapted therefor
Collapse
E21B 37/04
. .
operated by fluid pressure, e.g. free-piston scrapers (operating other tools by fluid pressure E21B 23/08)
E21B 37/045
. . .
{
Free-piston scrapers
}
E21B 37/06
.
using chemical means for preventing, limiting
{
or eliminating
}
 the deposition of paraffins or like substances (chemical compositions therefor C09K 8/52)
E21B 37/08
.
cleaning in situ of down-hole filters, screens,
{
e.g. casing perforations,
}
 or gravel packs (E21B 37/06 takes precedence)
E21B 37/10
.
Well swabs
{
(pistons in general F16J)
}
E21B 40/00
Tubing catchers, automatically arresting the fall of oil-well tubing
{
(preventing small objects from falling into the borehole E21B 41/0021)
}
Collapse
E21B 41/00
Equipment or details not covered by groups E21B 15/00 to E21B 40/00
Collapse
E21B 41/0007
.
{
for underwater installations (E21B 41/005, E21B 41/04, E21B 41/06, E21B 41/08, E21B 41/10 take precedence)
}
E21B 41/0014
. .
{
Underwater well locating or reentry systems
}
E21B 41/0021
.
{
Safety devices, e.g. for preventing small objects from falling into the borehole
}
Collapse
E21B 41/0035
.
{
Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches (whipstocks E21B 7/061; tool diverters E21B 23/002; cutting casing windows E21B 29/06; specific well pattern E21B 43/30)
}
E21B 41/0042
. .
{
characterised by sealing the junction between a lateral and a main bore
}
Collapse
E21B 41/005
.
{
Waste disposal systems (treatment of drilling fluid outside the borehole E21B 21/06; collecting oil or the like from a submerged leakage E21B 43/0122)
}
Collapse
E21B 41/0057
. .
{
Disposal of a fluid by injection into a subterranean formation
}
E21B 41/0064
. . .
{
Carbon dioxide sequestration (storing fluids in porous layers B65G 5/005)
}
E21B 41/0071
. .
{
Adaptation of flares, e.g. arrangements of flares in offshore installations (flares of waste gases or noxious gases F23G 7/08)
}
E21B 41/0078
.
{
Nozzles used in boreholes (drilling by liquid or gas jets E21B 7/18; drill bits with nozzles E21B 10/60; perforators using direct fluid action E21B 43/114; obtaining a slurry of minerals using nozzles E21B 43/29; nozzles in general B05B)
}
E21B 41/0085
.
{
Adaptations of electric power generating means for use in boreholes (generation of electric power per se H02)
}
E21B 41/0092
.
{
Methods relating to program engineering, design or optimisation
}
E21B 41/02
.
in situ inhibition of corrosion in boreholes or wells (dump bailers E21B 27/02; chemical compositions therefor C09K 8/54; inhibiting corrosion in general C23F)
E21B 41/04
.
Manipulators for underwater operations, e.g. temporarily connected to well heads (manipulators in general B25J)
E21B 41/06
.
Work chambers for underwater operations, e.g. temporarily connected to well heads (in general B63C 11/00)
E21B 41/08
.
Underwater guide bases, e.g. drilling templates; Levelling therefor
WARNING
-
This group was introduced in January 2000. Patent documents are continuously being reclassified to this group from groups E21B 7/12, E21B 33/035, E21B 43/017

E21B 41/10
.
Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases
Collapse
Guide Heading:
Obtaining fluids from wells
Collapse
E21B 43/00
Methods 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)
E21B 43/003
.
{
Vibrating earth formations (vibration generating arrangements for boreholes or wells E21B 28/00)
}
E21B 43/006
.
{
Production of coal-bed methane (E21B 43/243 takes precedence; methods or devices for drawing-off gases for safety purposes in mines E21F 7/00)
}
Collapse
E21B 43/01
.
specially adapted for obtaining from underwater installations (underwater well heads E21B 33/035)
E21B 43/0107
. .
{
Connecting of flow lines to offshore structures (E21B 43/013 takes precedence)
}
E21B 43/0122
. .
{
Collecting oil or the like from a submerged leakage (cleaning or keeping clear the surface of open water from oil or the like E02B 15/04)
}
Collapse
E21B 43/013
. .
connecting a production flow line to an underwater well head
E21B 43/0135
. . .
{
using a pulling cable
}
E21B 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)
Collapse
E21B 43/02
.
Subsoil filtering (E21B43/11TAKES precedence, chemical compositions for consolidating loose sand or the like around wells C09K 8/56)
E21B 43/025
. .
{
Consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof (sealing borehole walls E21B 33/138)
}
Collapse
E21B 43/04
. .
Gravelling of wells
E21B 43/045
. . .
{
Crossover tools
}
Collapse
E21B 43/08
. .
Screens or liners
{
(expandable screens or liners E21B 43/108; obtaining drinking water; filters E03B 3/18)
}
E21B 43/082
. . .
{
Screens comprising porous materials, e.g. prepacked screens
}
E21B 43/084
. . .
{
Screens comprising woven materials, e.g. mesh or cloth
}
E21B 43/086
. . .
{
Screens with preformed openings, e.g. slotted liners (comprising porous materials E21B 43/082)
}
E21B 43/088
. . .
{
Wire screens (comprising porous materials E21B 43/082; comprising woven materials E21B 43/084)
}
Collapse
E21B 43/10
. .
Setting of casings, screens, liners
{
or the like
}
 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)
E21B 43/101
. . .
{
for underwater installations
}
Collapse
E21B 43/103
. . .
{
of expandable casings, screens, liners, or the like
}
E21B 43/105
. . . .
{
Expanding tools specially adapted therefor
}
E21B 43/106
. . . .
{
Couplings or joints therefor
}
E21B 43/108
. . . .
{
Expandable screens or liners
}
Collapse
E21B 43/11
.
Perforators; Permeators
E21B 43/112
. .
Perforators with extendable perforating members, e.g actuated by fluid means
E21B 43/114
. .
Perforators using direct fluid action
{
on the wall to be perforated
}
, e.g. abrasive jets
Collapse
E21B 43/116
. .
Gun or shaped charge perforators
{
(projectiles with shaped or hollow charge F42B 12/10)
}
E21B 43/117
. . .
Shaped charge perforators (E21B 43/118 takes precedence)
E21B 43/118
. . .
characterised by lowering in vertical position and subsequent tilting to operating position
Collapse
E21B 43/1185
. . .
Ignition systems
E21B 43/11852
. . . .
{
hydraulically actuated
}
E21B 43/11855
. . . .
{
mechanically actuated, e.g. by movement of a wireline or a drop-bar (E21B 43/11852 takes precedence)
}
E21B 43/11857
. . . .
{
firing indication systems
}
Collapse
E21B 43/119
. .
Details, e.g. for locating perforating place or direction
E21B 43/1195
. . .
{
Replacement of drilling mud; decrease of undesirable shock waves
}
Collapse
E21B 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)
Collapse
E21B 43/121
. .
{
Lifting well fluids (survey of down-hole pump systems E21B 47/0007)
}
Collapse
E21B 43/122
. . .
{
Gas lift
}
E21B 43/123
. . . .
{
Gas lift valves
}
E21B 43/124
. . .
{
Adaptation of jet-pump systems
}
Collapse
E21B 43/126
. . .
{
Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive (powered by fluid E21B 43/129)
}
E21B 43/127
. . . .
{
Adaptations of walking-beam pump systems
}
E21B 43/128
. . .
{
Adaptation of pump systems with down-hole electric drives
}
E21B 43/129
. . .
{
Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole (gas-lift E21B 43/122; jet pumps E21B 43/124)
}
E21B 43/14
.
Obtaining from a multiple-zone well
Collapse
E21B 43/16
.
Enhanced recovery methods for obtaining hydrocarbons (fracturing E21B 43/26; obtaining slurry E21B 43/29; reclamation of contaminated soil in situ B09C;
{
chemical compositions therefor C09K 8/58
}
)
E21B 43/162
. .
{
Injecting fluid from longitudinally spaced locations in injection well
}
E21B 43/164
. .
{
Injecting CO2 or carbonated water (in combination with organic material C09K 8/594)
}
Collapse
E21B 43/166
. .
{
Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium (CO2 injection E21B 43/164; steam injection E21B 43/24)
}
E21B 43/168
. . .
{
Injecting a gaseous medium
}
E21B 43/17
. .
Interconnecting two or more wells by fracturing or otherwise attacking the formation (
{
E21B 43/2405,
}
 E21B 43/247 take precedence)
E21B 43/18
. .
Repressuring or vacuum methods
E21B 43/20
. .
Displacing by water
Collapse
E21B 43/24
. .
using heat, e.g. steam injection (heating, cooling or insulating wells E21B 36/00)
{
(in combination with organic material E21B43/22D)
}
E21B 43/2401
. . .
{
by means of electricity
}
E21B 43/2403
. . .
{
by means of nuclear energy (nuclear reactors G21)
}
E21B 43/2405
. . .
{
in association with fracturing or crevice forming processes (E21B 43/247 takes precedence)
}
Collapse
E21B 43/2406
. . .
{
Steam assisted gravity drainage (SAGD)
}
E21B 43/2408
. . . .
{
SAGD in combination with other methods
}
WARNING
-
Not complete pending a reorganisation. See also E21B 43/24 and subgroups

E21B 43/241
. . .
combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale
Collapse
E21B 43/243
. . .
Combustion in situ
Collapse
E21B 43/247
. . . .
in association with fracturing processes
{
or crevice forming processes
}
E21B 43/248
. . . . .
using explosives
Collapse
E21B 43/25
.
Methods for stimulating production (dump bailers E21B 27/02; vibration generating arrangements E21B 28/00; by vibrating earth formations E21B 43/00C] chemical compositions therefor C09K 8/60)
E21B 43/255
. .
{
including the injection of a gaseous medium as treatment fluid into the formation
}
Collapse
E21B 43/26
. .
by forming crevices or fractures
{
(chemical compositions therefor C09K 8/62)
}
E21B 43/261
. . .
{
Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
}
Collapse
E21B 43/263
. . .
using explosives
{
(Combustion in situ using explosives E21B 43/248)
}
E21B 43/2635
. . . .
{
by means of nuclear energy (peaceful applications of nuclear explosive devices in generalG21J 3/00)
}
E21B 43/267
. . .
reinforcing fractures by propping
{
(chemical compositions therefor C09K 8/80)
}
Collapse
E21B 43/28
.
Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B 43/241 takes precedence;
{
using steerable or laterally extendable nozzles E21B 43/292
}
)
E21B 43/281
. .
{
using heat (heating, cooling or insulating wells E21B 36/00)
}
E21B 43/283
. .
{
in association with a fracturing process
}
E21B 43/285
.
Melting minerals, e.g. sulfur (E21B 43/24 takes precedence; heating, cooling or insulating arrangements for wells E21B 36/00)
Collapse
E21B 43/29
.
Obtaining a slurry of minerals, e.g. by using nozzles
E21B 43/292
. .
{
using steerable or laterally extendable nozzles
}
E21B 43/295
.
Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B 43/243 takes precedence)
Collapse
E21B 43/30
.
Specific pattern of wells, e.g. optimizing the spacing of wells (production satellite stations E21B 43/017)
E21B 43/305
. .
{
comprising at least one inclined or horizontal well
}
E21B 43/32
.
Preventing gas- or water- coning phenoma, i.e. the formation of a conical column of gas or water around wells
Collapse
E21B 43/34
.
Arrangements for separating materials produced by the well (separating apparatus per se, see the relevant subclasses)
E21B 43/36
. .
Underwater separating arrangements (E21B 43/38 takes precedence)
Collapse
E21B 43/38
. .
in the well
E21B 43/385
. . .
{
by reinjecting the separated materials into an earth formation in the same well
}
E21B 43/40
. .
Separation associated with re-injection of separated materials
{
(E21B 43/385 takes precedence)
}
Collapse
Guide Heading:
Automatic control, surveying or testing
Collapse
E21B 44/00
Automatic 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; control systems in general G05); 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)
E21B 44/005
.
{
Below-ground automatic control systems
}
Collapse
E21B 44/02
.
Automatic control of the tool feed (
{
E21B 44/005
}
, E21B 44/10 take precedence)
E21B 44/04
. .
in response to the torque of the drive;
{
Measuring drilling torque (E21B 44/06 takes precedence; measuring stresses in a well bore pipe E21B 47/0006)
}
E21B 44/06
. .
in response to the flow or pressure of the motive fluid of the drive
E21B 44/08
. .
in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil
E21B 44/10
.
Arrangements for automatic stopping when the tool is lifted from the working face
{
informative reference: arrangements for automatic stopping for portable percussive tools B25D 9/265
}
E21B 45/00
Measuring the drilling time or rate of penetration
Collapse
E21B 47/00
Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B 21/08; geophysical logging G01V)
E21B 47/0001
.
{
for underwater installations
}
E21B 47/0002
.
{
Survey of boreholes or wells by visual inspection (photographing internal surfaces, e.g. of pipes G03B 37/005, E21B57/A7B8; closed circuit television systems H04N 7/18)
}
E21B 47/0003
.
{
Determining well or borehole volumes (determining depth E21B 47/04, diameter E21B 47/08; measuring volumes in general G01F)
}
E21B 47/0005
.
{
control of cementation quality or level (measuring temperature E21B 47/065)
}
E21B 47/0006
.
{
Measuring stresses in a well bore pipe string or casing (for locating stuck pipe E21B 47/09)
}
Collapse
E21B 47/0007
.
{
Survey of down-hole pump systems
}
E21B 47/0008
. .
{
Survey of walking-beam pump systems, e.g. for the detection of so called "pumped-off" conditions
}
Collapse
E21B 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);
{
(flexible centering means per se E21B 17/1014)
}
 Protecting measuring instruments in boreholes against heat, shock, pressure or the like
NOTE
-
Devices for both supporting and protecting measuring instruments are only classified in E21B 47/011

E21B 47/011
. .
{
Protecting measuring instruments (cooling or insulating arrangements for boreholes or wells E21B 36/00)
}
Collapse
E21B 47/02
.
Determining slope or direction (clinometers or direction meters G01C)
Collapse
E21B 47/022
. .
of the borehole,
{
e.g. using geomagnetism
}
E21B 47/02208
. . .
{
using seismic or acoustic means
}
Collapse
E21B 47/02216
. . .
{
using at least one source of electromagnetic energy and at least one detector therefor
}
E21B 47/02224
. . . .
{
at least one of the sources or one of the detectors being located above ground
}
E21B 47/02232
. . .
{
using a pendulum
}
E21B 47/024
. .
of devices in the borehole (E21B 47/022 takes precedence)
E21B 47/026
. .
of penetrated ground layers (apparatus for obtaining oriented cores E21B 25/16; formation testing E21B 49/00)
Collapse
E21B 47/04
.
Measuring depth or liquid level (measuring liquid level in general)
{
and telerecorders for level of liquids
}
 G01F;
{
measuring depth in general G01B 7/26
}
E21B 47/042
. .
{
Measuring or locating liquid level (E21B 47/044 takes precedence)
}
E21B 47/044
. .
{
using radioactive markers
}
Collapse
E21B 47/06
.
Measuring temperature or pressure (measuring temperature in general G01K; measuring pressure in general G01L)
{
telerecorders for pressure G01L; telerecorders for temperature G01K
}
E21B 47/065
. .
{
Measuring temperature
}
Collapse
E21B 47/08
.
Measuring the diameter (measuring diameter in general G01B)
E21B 47/082
. .
{
using radiant means, e.g. acoustic, radioactive, electromagnetic
}
Collapse
E21B 47/09
.
Locating or determining the position of objects in boreholes or wells,
{
e.g. the position of an extending arm
}
; Identifying the free or blocked portions of pipes (measuring depth E21B 47/04; measuring diameter E21B 47/08)
E21B 47/0905
. .
{
by detecting magnetic anomalies (investigating materials by investigating magnetic variables G01N 27/72)
}
E21B 47/091
. .
{
by detecting an acoustic anomaly, e.g. a mud-pressure pulse
}
E21B 47/0915
. .
{
using impression packers, e.g. to detect recesses or perforations
}
Collapse
E21B 47/10
.
Locating fluid leaks, intrusions or movements
{
using impression packers E21B 47/0915; flow measurement in general G01F; examining density and leaking in general G01M
}
E21B 47/1005
. .
{
using thermal measurements (measurement temperature E21B 47/065)
}
E21B 47/101
. .
{
using acoustic energy
}
E21B 47/1015
. .
{
using tracers: using radioactivity
}
E21B 47/102
. .
{
using electrical indications: using light radiations
}
E21B 47/1025
. .
{
Detecting leaks, e.g. of tubing, by pressure testing (investigating fluid-tightness of structures by using fluid or vacuum G01M 3/02)
}
Collapse
E21B 47/12
.
Means for transmitting measuring-signals
{
or control signals
}
 from the well to the surface
{
or from the surface to the well
}
, e.g. for logging while drilling (remote signalling in general G08)
E21B 47/121
. .
{
using earth as an electrical conductor (E21B 47/122 takes precedence; in generalH04B 13/02 ; electric prospectingG01V 3/00 )
}
Collapse
E21B 47/122
. .
{
by electromagnetic energy, e.g. radio frequency (in general H04B magnetic propspecting G01V 3/00)
}
E21B 47/123
. . .
{
using light waves (optical transmission in general H04B 10/00; light guides, e.g. optical fibres G02B 6/00)
}
E21B 47/124
. .
{
Storing data down-hole, e.g. in a memory or on a record carrier (recording in connection with measuring in general G01D; information storage in general G11)
}
Collapse
E21B 47/14
. .
using acoustic waves
E21B 47/16
. . .
through the drill string or casing,
{
e.g. by torsional acoustic waves
}
Collapse
E21B 47/18
. . .
through the well fluid,
{
e.g. mud pressure pulse telemetry
}
E21B 47/182
. . . .
{
by continuous mud waves with modulation of the waves
}
E21B 47/185
. . . .
{
by negative mud pulses using a pressure relieve valve between drill pipe and annulus
}
E21B 47/187
. . . .
{
by positive mud pulses using a flow restricting valve within the drill pipe
}
Collapse
E21B 49/00
Testing 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)
E21B 49/001
.
{
specially adapted for underwater installations
}
E21B 49/003
.
{
by analysing drilling variables or conditions (E21B 49/005 takes precedence; Systems specially adapted for monitoring a plurality of drilling variables or conditions E21B 44/00)
}
E21B 49/005
.
{
Testing the nature of borehole walls or the formation by using drilling mud or cutting data (investigating chemical or physical properties of materials per se G01N)
}
E21B 49/006
.
{
Measuring wall stresses in the borehole (investigation of mechanical properties of foundation soil E02D 1/022)
}
E21B 49/008
.
{
by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor (measuring pressure E21B 47/06; obtaining fluid samples or testing fluids E21B 49/08)
}
Collapse
E21B 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)
E21B 49/025
. .
{
of underwater soil, e.g. with grab devices (underwater coring E21B 25/18)
}
E21B 49/04
. .
using explosives in boreholes; using projectiles penetrating the wall
{
drilling by use of explosives E21B 7/007; gun or shaped charge perforators E21B 43/116
}
E21B 49/06
. .
with side-wall drilling tools
{
pressing
}
 or scrapers
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E21B 49/08
.
Obtaining fluid samples or testing fluids, in boreholes or wells
{
(packers E21B 33/12; valves E21B 34/00; analysing pressure variations in an injection or production test E21B 49/008)
}
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E21B 49/081
. .
{
with down-hole means for trapping a fluid sample (E21B 49/10 takes precedence)
}
E21B 49/082
. . .
{
Wire-line fluid samplers (E21B 49/083 takes precedence)
}
E21B 49/083
. . .
{
Samplers adapted to be lowered into or retrieved from a landing nipple, e.g. for testing a well without removing the drill string
}
E21B 49/084
. .
{
with means for conveying samples through pipe to surface
}
E21B 49/086
. .
{
Withdrawing samples at the surface
}
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E21B 49/087
. .
{
Well testing, e.g. testing for reservoir productivity or formation parameters
}
E21B 49/088
. . .
{
combined with sampling
}
E21B 49/10
. .
using side-wall fluid samplers or testers
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E21B 2003/00
Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B)
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E21B 2003/02
.
Surface drives for rotary drilling
E21B 2003/05
. .
with a to-and-fro rotation of the drill pipe or casing
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E21B 2010/00
Drill bits (specially adapted for deflecting the direction of boring E21B 7/064; with means for collecting substances E21B 27/00)
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E21B 2010/08
.
Roller bits (roller core bits E21B 10/06; with leading portion E21B 10/26; characterised by wear resisting parts E21B 10/46)
Collapse
E21B 2010/22
. .
characterised by bearing, lubrication or sealing details
E21B 2010/225
. . .
sealing details
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E21B 2010/24
. . .
characterised by lubricating details
E21B 2010/243
. . . .
with drilling fluid supply to the bearing
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E21B 2010/42
.
Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B 10/54, by conduits or nozzles for drilling fluid E21B 10/60, by detachable or adjustable parts E21B 10/62)
E21B 2010/425
. .
characterised by teeth or cutter arrangement
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E21B 2010/46
.
characterised by wear resisting parts, e.g. diamond inserts
{
(drill bits with self-renewable cutting edge E21B 10/006)
}
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E21B 2010/54
. .
the bit being of the rotary drag type, e.g. fork-type bits
E21B 2010/545
. . .
with blades having performed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
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E21B 2010/56
. .
Button type inserts (E21B 10/52 takes precedence)
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E21B 2010/561
. . .
Inserts with performed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
E21B 2010/562
. . . .
having a non planar or non circular cutting face
E21B 2010/563
. . . .
having a cutting face with different segments, e.g. mosaic-type inserts
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E21B 2010/564
. . . .
characterised by support details
E21B 2010/565
. . . . .
Interface between the substrate and the cutting element
E21B 2010/566
. . . .
with chip breaking arrangements
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E21B 2010/60
.
characterised by conduits or nozzles for drilling fluids (for roller bits E21B 10/18; for percussion drill bits E21B 10/38;
{
mining picks with arrangement of fluid-spraying nozzles E21C 35/187
}
)
E21B 2010/607
. .
characterised by the nozzle structure
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E21B 2010/62
.
characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B 10/64 takes precedence; for roller bits E21B 10/20;
{
for rotary drag type drill bits E21B 10/42
}
; for augers E21B 10/44)
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E21B 2010/622
. .
with plural separable cutter elements
E21B 2010/624
. . .
independently attachable
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E21B 2021/00
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 8/02)
E21B 2021/005
.
using gaseous fluids
E21B 2021/006
.
Underbalanced techniques, i.e. where borehole fluid pressure is below formation pressure
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E21B 2021/007
.
Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
E21B 2021/008
. .
Means engaging the bore entrance, e.g. hoods for collecting dust
Collapse
E21B 2021/06
.
Arrangements for treating drilling fluids outside the borehole (treating steps per se, see the relevant subclasses)
E21B 2021/061
. .
for treating dust-loaded gaseous fluids
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E21B 2023/00
Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells (setting of casings, screens or liners E21B 43/10)
E21B 2023/008
.
Self propelling system or apparatus, e.g. for moving tools within the horizontal portion of a borehole
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E21B 2033/00
Sealing or packing boreholes or wells
E21B 2033/005
.
Sealings characterised by their shape
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E21B 2033/10
.
in the borehole
{
sealing the junction between main bore and laterals E21B 41/0042
}
E21B 2033/105
. .
characterised by sealing the junction between a lateral and a main bore
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E21B 2034/00
Valve arrangements for boreholes or wells (in drilling fluid circulation systems E21B 21/10;
{
tool diverters E21B 23/002;
}
 blow-out preventers E21B 33/06; oil flow regulating apparatus E21B 43/12; valves in general F16K)
E21B 2034/002
.
Ball valves
E21B 2034/005
.
Flapper valves
E21B 2034/007
.
Sleeve valves
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E21B 2041/00
Equipment or details not covered by groups E21B 15/00 to E21B 40/00
E21B 2041/0028
.
Fuzzy logic, artificial intelligence, neural networks, or the like
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E21B 2043/00
Methods 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)
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E21B 2043/01
.
specially adapted for obtaining from underwater installations (underwater well heads E21B 33/035)
E21B 2043/0115
. .
Drilling for or production of natural gas hydrate reservoirs; Drilling through or monitoring of formations containing gas hydrates
Collapse
E21B 2043/12
.
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)
Collapse
E21B 2043/121
. .
{
Lifting well fluids (survey of down-hole pump systems E21B 47/0007)
}
E21B 2043/125
. . .
Adaptation of walking-beam pump systems
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E21B 2049/00
Testing 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)
Collapse
E21B 2049/08
.
Obtaining fluid samples or testing fluids, in boreholes or wells
{
(packers E21B 33/12; valves E21B 34/00; analysing pressure variations in an injection or production test E21B 49/008)
}
E21B 2049/085
. .
Determining specific physical fluid parameters
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Last Modified: 04/16/2013 4:31:16 PM