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Outline
Indent Level
Color Curly Brackets (indicating CPC extensions to IPC)

CPC
COOPERATIVE PATENT CLASSIFICATION
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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 E21B23/00D
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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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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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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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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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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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 explosivesE21B 31/1075; 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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.
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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.
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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.
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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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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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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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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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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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 E21B17/10D)
}
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
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E21B 17/04
. .
between rod
{
or the like
}
and bit or between rod and rod
{
or the like
}
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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
}
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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
}
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E21B 17/1014
. .
{
Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well (E21B 17/1042 takes precedence)
}
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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
}
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E21B 17/1042
. .
{
Elastomer protector or centering means
}
E21B 17/105
. . .
{
split type
}
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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
Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick (surface drives E21B 1/02, E21B 3/02)
Collapse
.
{
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
.
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
.
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
. .
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
.
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
.
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
.
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
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
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
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
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
}
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
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
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
Sealing or packing boreholes or wells
Collapse
.
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
. .
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
. .
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 E21B43/02B, 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
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)
}
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
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
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)
}
Tubing catchers, automatically arresting the fall of oil-well tubing
{
(preventing small objects from falling into the borehole E21B 41/0021)
}
Collapse
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
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
.
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
.
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
. .
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
.
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
.
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
.
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
.
Methods for stimulating production (dump bailers E21B 27/02; vibration generating arrangements E21B 28/00; by vibrating earth formations E21B43/00C] 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
.
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
}
.
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
.
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
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
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
}
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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)
}
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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)
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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
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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
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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)
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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
This page is owned by Office of Patent Classification.
Last Modified: 10/10/2013