CPC Definition - Subclass E21B
This place covers:
Earth drilling, e.g. deep drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells. This subclass also includes drilling at shallow depths but over extended distances, such as drilling for laying a pipeline under surface obstacles.
This place covers:
Machines and methods in which the drilling action is done principally by percussion.
The percussive drive is placed outside of the borehole, and the drilling can be for any depth, including drillholes and mining applications.
Illustrative examples of the subject matter classified in this place:
1.
2.
When classifying in groups E21B 1/12 - E21B 1/38, a symbol from one of the following main groups of B25D should also be given:
B25D 9/00 Portable percussive tools with fluid-pressure drives.
B25D 11/00 Portable percussive tools with motor drive.
B25D 16/00 Portable percussive machines with superimposed rotation.
B25D 17/00 Details of, or accessories for, portable power-driven percussive tools.
Attention is drawn to the following places, which may be of interest for search:
Drives used in the borehole | |
Drives for combined percussion and rotary drilling | |
Portable drilling rigs | |
Derricks, masts | |
Rotary drilling machines in general |
This place covers:
Machines and methods in which the drilling action is done principally by rotation.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Drives for drilling, used in the borehole | |
Drives for combined percussion and rotary drilling | |
Portable drilling rigs | |
Derricks, masts | |
Rotary drilling machines in general |
Attention is drawn to the following places, which may be of interest for search:
Portable drilling rigs with rotary tables |
This place does not cover:
Derricks adapted to be moved on their substructure |
Attention is drawn to the following places, which may be of interest for search:
Supports for the drilling machine specially adapted for underwater drilling |
Attention is drawn to the following places, which may be of interest for search:
Connecting or disconnecting couplings or joints | |
Rope, cable or chain winding mechanisms, capstans |
This place covers:
Drives located inside the borehole for powering drilling units.
Illustrative example of subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Rotary-piston machines or pumps | |
Rotary-piston machines with helical teeth, e.g. Moineau motors | |
Arrangements for handling mechanical energy structurally associated with the machine, e.g. structural association with mechanical driving motor or auxiliary dynamo-electric machine |
This place does not cover:
Bearing, lubrication or sealing details for roller bits |
This place does not cover:
Continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts |
Attention is drawn to the following places, which may be of interest for search:
Gearings in general |
Attention is drawn to the following places, which may be of interest for search:
Hydraulic turbines for drilling wells |
This place does not cover:
Boring rams |
Attention is drawn to the following places, which may be of interest for search:
Percussion drill bits | |
Releasing-jars |
This place covers:
Drives outside the borehole for combined percussion and rotary drilling.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Drives for drilling, used in the borehole | |
Portable drilling rigs | |
Derricks, masts | |
Methods or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency | |
Portable percussive machines with superimposed rotation |
This place covers:
Drilling methods and apparatus characterised by any aspect that differs from those of conventional drilling, which is understood as drilling a vertical borehole with a roller or drag type bit, using a derrick or mast.
Attention is drawn to the following places, which may be of interest for search:
Rotary or percussion drill bits | |
Supports for the drilling machine, e.g. derricks or masts | |
Drilling rods or pipes | |
Obtaining cores | |
Setting of casings when not simultaneous with drilling of the borehole | |
Details of, or accessories for, portable power-driven percussive tools | |
Vehicles adapted to transport or to comprise special loads | |
Underwater drilling for submerged foundations | |
Erecting posts for fences | |
Machines for drilling and setting anchoring bolts | |
Details of hydraulic circuits |
This place covers:
Drilling devices with multiple shafts in the borehole that are independently driven or one shaft is driven relative to another.
This place does not cover:
Drilling a non-circular hole |
Attention is drawn to the following places, which may be of interest for search:
Plural down-hole drives | |
Simultaneously drilling and casing | |
Pipes with plural fluid passages |
This place covers:
Drilling devices with mechanical means for removing drill cuttings and soil from the borehole.
Attention is drawn to the following places, which may be of interest for search:
Boring grabs | |
Containers for collecting material in boreholes | |
Tunneling |
Attention is drawn to the following places, which may be of interest for search:
Bailers with helical conveying means |
This place does not cover:
Underwater drilling using explosives |
Attention is drawn to the following places, which may be of interest for search:
Setting-tools actuated by explosives | |
Cutting or destroying objects in boreholes by explosives | |
Freeing objects using explosives | |
Gun or shaped-charge perforators | |
Fracturing by explosives | |
Taking samples using explosives |
Attention is drawn to the following places, which may be of interest for search:
Ice-fishing |
Attention is drawn to the following places, which may be of interest for search:
Portable drilling rigs for use on underwater floors |
Attention is drawn to the following places, which may be of interest for search:
Rotary tables |
Attention is drawn to the following places, which may be of interest for search:
Levelling of soil-shifting machines |
This place covers:
Drilling holes into rock material or soil in mines, quarries and construction sites, e.g. blast holes or anchor bolt holes, using drilling machines with drill motor carriage displaceable on feed beam.
Attention is drawn to the following places, which may be of interest for search:
Machines for drilling anchor holes and setting anchor bolts |
This place covers:
Drilling tools portable, e.g. by hand, and detachable from portable drilling rig vehicles, e.g. from motorcars.
Attention is drawn to the following places, which may be of interest for search:
Hand operated drilling tools |
This place covers:
Directional drilling in the general sense of producing a borehole in a direction other that vertical. The drilling direction can be essentially horizontal, such as for laying a pipe under an obstruction or in an urban environment.
Attention is drawn to the following places, which may be of interest for search:
Derricks or masts specially adapted therefor |
Attention is drawn to the following places, which may be of interest for search:
Directional window cutting | |
Deflecting the direction of fishing tools |
This place does not cover:
Underwater drilling using heave compensators |
Attention is drawn to the following places, which may be of interest for search:
Supports for the drilling machine, e.g. derricks or masts, specially adapted for underwater drilling | |
Telescoping joints | |
Well heads specially adapted for underwater installations | |
Submerged foundations |
Attention is drawn to the following places, which may be of interest for search:
Guide line systems | |
Floating drilling platforms |
Attention is drawn to the following places, which may be of interest for search:
Drilling by use of explosives |
This place covers:
Drilling using, for example, lasers or electrical discharge between electrodes that generate shock waves.
This place does not cover:
Drilling by use of heat, e.g. flame drilling |
Attention is drawn to the following places, which may be of interest for search:
Hydraulic monitors |
This place covers:
Methods in which the drilling action takes place simultaneously with the installation of a casing or of the pipe to be installed, with the borehole being horizontal or not.
Attention is drawn to the following places, which may be of interest for search:
Surface means for applying to-and-fro rotation movements to the casing | |
Drilling with multiple driven shafts | |
Pushing means outside of the borehole | |
Placing piles | |
Sinking shafts while moving the lining downwards | |
Making galleries by forcing prefabricated elements through the ground |
Attention is drawn to the following places, which may be of interest for search:
Drilling with helical conveying means | |
Augers | |
Drilling rods or pipes with helical structure |
Attention is drawn to the following places, which may be of interest for search:
Down-hole drives per se |
Attention is drawn to the following places, which may be of interest for search:
Down-hole drives per se |
This place does not cover:
Using down-hole drives in combination with helical conveying means | |
Using down-hole drives without earth removal |
Attention is drawn to the following places, which may be of interest for search:
Using down-hole drives per se |
This place covers:
Drilling or forming holes without cutting into the soil or earth.
Drilling or forming holes by driving a tool into the earth to displace and compact the soil.
This place does not cover:
Enlarging drilled holes, e.g. by counterboring, without earth removal |
Attention is drawn to the following places, which may be of interest for search:
Down-hole drives | |
Fluid operated of the self propelled-type |
This place covers:
The use of earth removal devices or processes separate from the drilling devices to remove earth or soil from the hole.
This place covers:
Vertical or horizontal drilling, in which means are provided for enlarging a borehole made previously, which borehole may have been made by the same machine carrying out the enlargement, or by a different machine or in a previous operation.
Illustrative examples of the subject matter classified in this place:
1.
2.
Attention is drawn to the following places, which may be of interest for search:
Drill bits for enlarging the borehole |
This place covers:
Drill bits for any application in earth drilling, be it deep drilling for oil and gas or rock drilling for mining or for use in an underground space.
This place does not cover:
Drill bits specially adapted for deflecting the direction of boring | |
Drill bits with means for collecting substances |
Attention is drawn to the following places, which may be of interest for search:
Manufacture of articles from metal powder | |
Special treatment of metallic powder, e.g. to facilitate working, to improve properties | |
Cutting tools of which the bits or tips are of special material | |
Drill bits for stone or stone-like material | |
Alloys containing diamond | |
Bulkheads, piles specially adapted to foundation engineering |
In this place, the following terms or expressions are used with the meaning indicated:
Arrangement of teeth or other cutting elements: placement or number of elements on a bit body |
|
Wear resisting parts: materials on the body of the bit adapted for withstanding wear caused by the flow of drilling fluid having cuttings entrained therein |
|
Chisel or button type inserts: |
|
Preformed cutting elements mounted on a distinct support: |
|
This place does not cover:
Core bits characterised by wear resisting parts |
Attention is drawn to the following places, which may be of interest for search:
Obtaining undisturbed cores |
Attention is drawn to the following places, which may be of interest for search:
Roller bits with disc cutters |
Attention is drawn to the following places, which may be of interest for search:
Drilling fluid supply to the bearings |
Attention is drawn to the following places, which may be of interest for search:
Cross axle roller bits |
This place does not cover:
Percussion drill bits with leading portion |
Attention is drawn to the following places, which may be of interest for search:
Enlarging boreholes in general | |
Augers with leading portion | |
Turning or boring with stone, rock or concrete as tool or workpiece material | |
Tools for working stone or stone-like materials by boring or drilling |
This place does not cover:
Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits or fish tail bits |
Attention is drawn to the following places, which may be of interest for search:
Drilling rods with helical structure |
Attention is drawn to the following places, which may be of interest for search:
Percussion drill bits in general |
Attention is drawn to the following places, which may be of interest for search:
Drill bits with self-renewable cutting edge |
Attention is drawn to the following places, which may be of interest for search:
Saw cylinders having their cutting rim equipped with abrasive particles for drilling stone or glass |
This place covers:
Rotary drag type bits with blades having preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts.
Attention is drawn to the following places, which may be of interest for search:
Inserts per se |
Attention is drawn to the following places, which may be of interest for search:
Cutting tools of which the bits or tips are of special material and characterised by chip-breakers |
This place does not cover:
Drill bits characterised by wear resisting parts, the bit being of core type with inserts in form of chisels, blades or the like | |
Drill bits characterised by wear resisting parts, the bit being of roller type with chisel- or button-type inserts |
Attention is drawn to the following places, which may be of interest for search:
Drill bits characterised by wear resisting parts, the bit being of the rotary drag type, e.g. fork-type bits |
This place does not cover:
Roller drill bits characterised by conduits or nozzles for drilling fluids | |
Percussion drill bits characterised by conduits or nozzles for drilling fluids |
Attention is drawn to the following places, which may be of interest for search:
Mining picks with arrangement of fluid-spraying nozzles |
This place does not cover:
Roller bits characterised by detachable or adjustable parts | |
Augers with leading portion or with detachable parts | |
Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe |
Attention is drawn to the following places, which may be of interest for search:
Rotary drag type drill bits |
Attention is drawn to the following places, which may be of interest for search:
Retrievable core receivers |
This place covers:
Other drilling tools different from the drill bits of E21B 10/00
Attention is drawn to the following places, which may be of interest for search:
Hand portable tools detachable from portable drilling rigs |
This place covers:
Impact driven tools or devices for forming holes in ground or soil.
Attention is drawn to the following places, which may be of interest for search:
Percussion drives used in the borehole | |
Self-propelled fluid-operated hammers | |
Burrowing devices | |
Percussion drill bits |
This place covers:
Boring devices that both form the borehole and collect material for removal from the borehole.
Illustrative example of subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Machines slitting solely by one or more cutter chains moving unidirectionally along jibs | |
Slitting by unguided cutter cables or cutter chains, or by unguided tools drawn along the working face by cables or the like | |
Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face, e.g. by a conveyor, by a guide parallel to a conveyor | |
Machines which completely free the mineral from the seam solely by slitting by a single chain guided on a frame with or without auxiliary slitting means |
Attention is drawn to the following places, which may be of interest for search:
Connecting and disconnecting drill bit and drilling pipe | |
Sharpening stone drill bits |
This place covers:
Drilling derricks or masts having such dimensions that require considerable complication for assembling and disassembling them, so that they cannot be considered as "movable" or "portable" units:
Attention is drawn to the following places, which may be of interest for search:
Drill rigs with movable understructures | |
Floating drilling platforms | |
Drilling platforms on legs |
Attention is drawn to the following places, which may be of interest for search:
Derricks or masts specially adapted for directional drilling, e.g. slant hole rigs |
This place does not cover:
Supports for the drilling machine specially adapted for directional drilling, e.g. slant hole rigs |
Attention is drawn to the following places, which may be of interest for search:
Derricks or masts adapted to be moved on their substructure, e.g. with skidding means | |
Floating drilling platforms | |
Drilling platforms on legs |
Attention is drawn to the following places, which may be of interest for search:
Derricks or masts adapted to be moved on their substructure, e.g. with skidding means |
This place covers:
Pipes for use in wellbores, for drilling but also for subsequent operations, such as casings or risers. Couplings between pipes. Centralisers and other accessories for pipes.
Attention is drawn to the following places, which may be of interest for search:
Connecting flow lines to offshore structures | |
Connecting flow lines to an underwater wellhead | |
Expansible tubulars | |
Details of, or accessories for, portable power-driven percussive tools | |
Rod couplings in general | |
Tubes or tube couplings in general | |
Repairing or joining pipes on or under water, e.g. subsea flow lines | |
Pipe-line systems |
This place does not cover:
Arrangements for connecting cables or wirelines to downhole devices | |
Electrical or electro-magnetic connections |
Attention is drawn to the following places, which may be of interest for search:
Electrically insulated joints or couplings |
Attention is drawn to the following places, which may be of interest for search:
Supporting a riser from a drilling or production platform specially adapted for underwater drilling | |
Riser connectors |
Attention is drawn to the following places, which may be of interest for search:
Connecting or disconnecting pipe couplings or joints | |
Fishing tools for frozen rods, casings, ropes, bits or the like |
Attention is drawn to the following places, which may be of interest for search:
Protectors and centralisers for cables and control lines |
Attention is drawn to the following places, which may be of interest for search:
Releasing-joints between rod or the like and bit or between rod and rod or the like |
Attention is drawn to the following places, which may be of interest for search:
Swivel joints in hose-lines |
Attention is drawn to the following places, which may be of interest for search:
Gun or shaped-charge perforators | |
Dropping perforation guns after gun actuation |
Attention is drawn to the following places, which may be of interest for search:
Heave compensators in the derrick | |
Releasing-jars | |
Shock-absorbers in general |
Attention is drawn to the following places, which may be of interest for search:
Drives used in the borehole with anchoring means | |
Guiding or centralising devices outside the borehole | |
Devices for positioning logging sondes with respect to the borehole wall |
Attention is drawn to the following places, which may be of interest for search:
Measuring diameter of boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Casing shoes having a valve |
This place does not cover:
Flexible or articulated drilling pipes with plural fluid passages |
Attention is drawn to the following places, which may be of interest for search:
Circulation of drilling fluid by means of such pipes | |
Joints or fittings for double-walled or multi-channel pipes or pipe assemblies |
Attention is drawn to the following places, which may be of interest for search:
Risers | |
Swivel joints between rod or the like and bit or between rod and rod or the like |
Attention is drawn to the following places, which may be of interest for search:
Hoses with electrically conducting means in general | |
Flexible electrical cables in boreholes |
Attention is drawn to the following places, which may be of interest for search:
Drill bits with helical conveying portion |
This place covers:
Machines or methods performed in the surface for assembling pipes, hoisting pipes, pushing pipes into a borehole, storing pipes and similar. The application is typically for drilling, i.e. vertical, horizontal, deep drilling, mining or other earth drilling, but can also be for well treatment or other.
Attention is drawn to the following places, which may be of interest for search:
Surface drives | |
Manipulators mounted on wheels or on carriages | |
Gripping heads |
This place covers:
Handling and supporting of tubulars in relation to underwater drilling operations other than feeding the drill string into the borehole or controlling the weight on bit.
Illustrative example of subject matter classified in this place:
This place does not cover:
Apparatus specially adapted for drilling underwater for feeding the rods or cables, increasing or decreasing the pressure on the drilling tool or counterbalancing the weight of the rods | |
Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected, specially adapted for drilling |
Attention is drawn to the following places, which may be of interest for search:
Risers with buoyancy elements |
Attention is drawn to the following places, which may be of interest for search:
Cathead actuated pipe wrenches or spinners | |
Capstans, winches |
This place covers:
Apparatus for suspension by rods or cables that have normally no capacity of applying rotation. A spinner or other rotary drive may be suspended from the suspension apparatus.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Slips in rotary tables |
This place covers:
Apparatus for pushing drilling tools into the borehole. All kinds of earth drilling tools are classified in these groups, such as deep drilling tools, rock drills for mining, horizontal drills or coiled tubing.
Apparatus for increasing/decreasing the pressure on the drilling tool.
Apparatus for counterbalancing the weight of the rods.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Handling reeled pipe or rod units, e.g. flexible drilling pipes | |
Automatic control of the tool feed |
Attention is drawn to the following places, which may be of interest for search:
Hoisting drums |
This place covers:
Feeding the drill string for underwater drilling.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Drilling-pipe telescoping joints | |
Heave compensators for supporting a riser |
This place does not cover:
Rotary tables with master bushing or kelly bushing |
Attention is drawn to the following places, which may be of interest for search:
Slip-type elevators | |
Casing heads with slips |
Attention is drawn to the following places, which may be of interest for search:
Rope clamps in general |
This place covers:
Storage of rods and handling of rods between storage and a position where the rods can be connected or disconnected.
This place does not cover:
Combined feeding from rack and connecting | |
Handling reeled pipe or rod units |
Attention is drawn to the following places, which may be of interest for search:
Storing elongated articles in general |
This place covers:
Method or apparatus for connecting or disconnecting the rods.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Combined feeding from rack and connecting, e.g. automatically |
Attention is drawn to the following places, which may be of interest for search:
Pipe wrenches or the like |
This place covers:
A powered winch system used to tension chains, cables and ropes for actuation of the wrench.
Illustrative example of the subject matter classified in this place:
This place covers:
The combination of feeding from rack and connecting.
Illustrative example of subject matter classified in this place:
This place covers:
Devices located at the surface for guiding or centralising drill pipe as it is inserted into a well.
This place covers:
Control of circulation and pressure of fluids in a borehole, typically drilling fluids, tools for filling a borehole, treatment of drill cuttings, various types of drilling fluids.
This place does not cover:
Freeing objects stuck in boreholes by flushing |
Attention is drawn to the following places, which may be of interest for search:
Cementing | |
Enhanced recovery methods | |
Fracturing formations | |
Destroying or transforming solid or contaminated waste into something useful or harmless | |
Floating drilling platforms, e.g. carrying water-oil separating devices | |
Well drilling compositions |
This place covers:
Handling drilling fluids or cuttings outside the borehole without modification to the composition of the drilling fluid.
Attention is drawn to the following places, which may be of interest for search:
Swivel joints in hose-lines | |
Arrangements for treating drilling fluids | |
Waste disposal systems |
Attention is drawn to the following places, which may be of interest for search:
Valve arrangements in drilling fluid circulation systems in general |
Attention is drawn to the following places, which may be of interest for search:
Hose connections in general |
This place covers:
Treating drilling fluid outside the borehole in a way that modifies the composition of the drilling fluid. This includes drilling fluid exiting the well and new drilling fluid introduced into the well.
This place covers:
Treating drilling fluids and wellbore treatment fluids by mixing in new or additional components.
Attention is drawn to the following places, which may be of interest for search:
Materials not provided for elsewhere for treating liquid pollutants, e.g. oil, gasoline or fat |
Attention is drawn to the following places, which may be of interest for search:
Valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints | |
Valves in general |
This place does not cover:
Valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints |
Attention is drawn to the following places, which may be of interest for search:
Cementing valves |
Attention is drawn to the following places, which may be of interest for search:
Pipes with plural fluid passages |
This place does not cover:
Methods or apparatus for flushing boreholes using liquids and gases, e.g. foams |
Attention is drawn to the following places, which may be of interest for search:
Arrangements for handling drilling fluids outside the borehole | |
Arrangements for treating drilling fluids |
This place covers:
Actuators for installing tools used for any application in a borehole, wherein the way of installation is more relevant than the function of the tool as such.
This place does not cover:
Setting of casings, screens or liners |
Attention is drawn to the following places, which may be of interest for search:
Borehole thrusters | |
Fishing for or freeing objects in boreholes or wells |
If a document discloses specific details of actuation or installation according to the meaning of E21B 23/00, and the actuation is done by elements incorporated in the tool, then those details are also classified in E21B 23/00.
The tool in question may in addition be classified in the group that corresponds to its function or construction.
Attention is drawn to the following places, which may be of interest for search:
Self-propelled fluid operated hammers | |
Burrowing devices | |
Self-contained pigs |
This place does not cover:
Anchoring of drives in the borehole | |
Apparatus for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing | |
Apparatus for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets | |
Apparatus operated by fluid means | |
Apparatusfor setting packers |
Attention is drawn to the following places, which may be of interest for search:
Packers |
This place covers:
Tools for setting packers, detachable from the packer.
Attention is drawn to the following places, which may be of interest for search:
Setting by fluid means | |
Setting means incorporated into packers |
Attention is drawn to the following places, which may be of interest for search:
Tool diverters | |
Special provisions on heads forintroducing objects or fluids into,or removing objects from, wells | |
Cementing plugs | |
Scrapers operated by fluid pressure |
This place covers:
Tool diverters, e.g. for through-the-flow line tool systems or for wire-line tools
Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:
Tool diverters for drilling | |
Tool diverters for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets |
Attention is drawn to the following places, which may be of interest for search:
Side entry subs for connecting cables or wirelines to downhole devices | |
Control line protectors for plural rods, pipes or lines | |
Surface apparatus for feeding cables | |
Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems | |
Provision on well heads for introducing or removing cable-operated tools |
This place covers:
Tools for receiving, preserving, transporting, etc., a core.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Core bits |
Attention is drawn to the following places, which may be of interest for search:
Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells, using explosives or projectiles in boreholes | |
Side-wall sampling or coring |
Attention is drawn to the following places, which may be of interest for search:
Investigating or analysing materials by determining their chemical or physical properties, e.g. testing of core samples per se and devices therefore |
Attention is drawn to the following places, which may be of interest for search:
Retrievable drill bits |
This place covers:
Illustrative example of subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Junk baskets for fishing |
Attention is drawn to the following places, which may be of interest for search:
Drilling with helical conveying means combined with bucket-type container |
This place covers:
The vibration is normally generated by tools inside the borehole.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Vibration for fishing for or freeing objects | |
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, using acoustic waves | |
Generating seismic energy for geophysical measurements |
Attention is drawn to the following places, which may be of interest for search:
Vibration for drilling | |
Vibrating earth formations | |
Generating vibrations in general |
This place covers:
Cutting or deforming methods and apparatus for pipes, lines etc. inside the wellbore.
Attention is drawn to the following places, which may be of interest for search:
Reconditioning of well casings while in the ground by enlarging drilled holes or counterboring | |
Shear-type blow-out preventers | |
Expanding tubulars | |
Perforators |
This place does not cover:
Freeing stuck objects by explosives |
Attention is drawn to the following places, which may be of interest for search:
Destroying objects in boreholes or wells by explosives |
This place does not cover:
Cutting a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe | |
Cutting or deforming pipes to control fluid flow |
Attention is drawn to the following places, which may be of interest for search:
Whipstocks |
Attention is drawn to the following places, which may be of interest for search:
Blow-out preventers | |
Shear type blow-out preventers |
Attention is drawn to the following places, which may be of interest for search:
Enlarging drilled holes, e.g. counterboring | |
Expanding tools for setting expansible casings, liners, screens or the like |
Attention is drawn to the following places, which may be of interest for search:
Provisions on well heads for introducing or removing objects | |
Locating or determining the position of objects in boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Cutting by explosive |
Attention is drawn to the following places, which may be of interest for search:
Vibration generating arrangements for boreholes or wells |
This place covers:
Processes for unsticking the pipe from the wellbore wall by, for example, applying force to pipe, lowering pressure in the wellbore or using treatment fluid.
Attention is drawn to the following places, which may be of interest for search:
Additives for releasing stuck drill pipe |
Attention is drawn to the following places, which may be of interest for search:
Downhole impacting means | |
Telescoping joints |
Attention is drawn to the following places, which may be of interest for search:
Apparatus for deflecting the boring |
Attention is drawn to the following places, which may be of interest for search:
Cutting or destroying means per se |
Attention is drawn to the following places, which may be of interest for search:
Construction of grippers for machine tools | |
Gripping heads, Manipulators in general | |
Gripping members for cranes |
This place covers:
Apparatus and methods for sealing, both at the surface and in the interior of a borehole
Attention is drawn to the following places, which may be of interest for search:
Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions |
Pitless wells are also classified in E21B 33/00
This place covers:
Apparatus for sealing a wellbore and placed outside the wellbore, be it at the surface or subsea, such as wellheads, casing or tubing hangers,
Christmas trees or blow-out preventers:
Attention is drawn to the following places, which may be of interest for search:
Valve arrangements for boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Corrosion protection means in general |
Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:
Connecting a production flow line to an underwater well head |
Attention is drawn to the following places, which may be of interest for search:
Underwater electrical connections in general |
Attention is drawn to the following places, which may be of interest for search:
Setting of casings in wells |
Attention is drawn to the following places, which may be of interest for search:
Slips in rotary table |
This place does not cover:
Rotating blow-out preventers |
Attention is drawn to the following places, which may be of interest for search:
Valve arrangements for boreholes or wells | |
Control systems for blow-out preventers |
This place does not cover:
Cutting of wireline |
Attention is drawn to the following places, which may be of interest for search:
Cutting pipes |
Attention is drawn to the following places, which may be of interest for search:
Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads | |
Connectors used on well heads, e.g. for connecting blow-out preventer and riser |
This place does not cover:
Cementing-heads, e.g. having provision for introducing cementing plugs |
Attention is drawn to the following places, which may be of interest for search:
Wipers; Oil savers | |
Launching or retrieval of pigs or moles |
This place covers:
Wipers, oil savers and stuffing boxes.
This place covers:
Packers, tools lowered with a reduced diameter and expanded by various means to establish an annular seal between an outer tubular or wall and an inner tubular:
This place does not cover:
Bridging plugs for cementing | |
Using plugs for isolating cement charge |
Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:
Locking packers or plugs in landing nipples |
Attention is drawn to the following places, which may be of interest for search:
Metal packing seals in general |
This place does not cover:
Multiple string packers | |
Units with longitudinally-spaced plugs for isolating the intermediate space |
Attention is drawn to the following places, which may be of interest for search:
Packers or plugs characterised by the construction of the sealing or packing means |
This place covers:
Tools for plugging the bore or a well, and to methods for cementing parts of a wellbore, for cementing a casing in the wellbore and similar.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Dump bailers | |
Chemical compositions for cementing, plugging holes, crevices or the like | |
Methods or apparatus for grouting offshore structures |
Attention is drawn to the following places, which may be of interest for search:
Packers |
Attention is drawn to the following places, which may be of interest for search:
Packers | |
Consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof | |
Compositions for plastering the borehole wall |
Attention is drawn to the following places, which may be of interest for search:
Control of cementation quality or level | |
Compositions for cementing |
This place covers:
Constructive details of valves specifically adapted for use at the surface of a wellbore or in the interior of a wellbore.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Valve arrangements in drilling fluid circulation systems | |
Tool diverters | |
Valve drill bits | |
Blow-out preventers | |
Oil flow regulating apparatus | |
Gas lift valves | |
Valves in general |
Attention is drawn to the following places, which may be of interest for search:
Control means being outside the borehole |
This place covers:
Means for controlling valves in wellheads, downhole valves, blow out preventers.
Attention is drawn to the following places, which may be of interest for search:
Fluid-pressure systems with accumulators |
Attention is drawn to the following places, which may be of interest for search:
Cutting or deforming pipes to control fluid flow | |
Controlling flow of fluid to or in wells | |
Fire fighting in general | |
Prevention of fires in mines or tunnels |
This place covers:
Equipment for generating heat at the surface or in the wellbore, for transmitting heat into a wellbore, or for cooling wellbores.
Equipment for heating or cooling a wellbore, either at the surface or from within the wellbore.
Heating or cooling fluid produced or treatment fluids in the wellbore.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Drilling by use of heat | |
Secondary recovery methods using heat |
If a document describes the extension of the heating action into a reservoir or formation for enhanced recovery, then this operation is classified in E21B 43/24.
Attention is drawn to the following places, which may be of interest for search:
Cooling of downhole sensors/electronics |
This place covers:
Methods or apparatus for cleaning boreholes or wells. Cleaning by physical or chemical action.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor |
Attention is drawn to the following places, which may be of interest for search:
Bailers | |
Inhibition of corrosion | |
Cleaning pipes in general |
Attention is drawn to the following places, which may be of interest for search:
Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems |
This place covers:
The use of chemical means for preventing, limiting, or removing substances such as paraffins and filter cakes from the wellbore.
Attention is drawn to the following places, which may be of interest for search:
Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning |
Attention is drawn to the following places, which may be of interest for search:
Pistons in general |
This place covers:
Tubing catchers, automatically arresting the fall of oil-well tubing
This place does not cover:
Preventing small objects from falling into the borehole |
Attention is drawn to the following places, which may be of interest for search:
Slips, spiders |
This place covers:
- Equipment as specified in the subgroups of E21B 41/00.
- Equipment specifically adapted for use in earth drilling and not covered by other groups of E21B or by the subgroups of E21B 41/00.
- Timers and actuators.
Attention is drawn to the following places, which may be of interest for search:
Power stations, adaptations for drilling wells | |
Fuel cells; Manufacture thereof |
The technical field E21B is an application field, wherein many different tools performing various functions find use. Care should be taken not to classify in E21B 41/00 documents describing methods or apparatus marginally related to oil and gas drilling and production for which no suitable class in E21B can be found. Such documents should instead be classified in the groups corresponding to their specific function.
Examples of places in relation to which this place is residual:
Tool diverters | |
Cutting casing windows |
Attention is drawn to the following places, which may be of interest for search:
Whipstocks | |
Specific well pattern |
Attention is drawn to the following places, which may be of interest for search:
Collecting oil or the like from a submerged leakage | |
Treating radioactively contaminated material; Decontamination arrangements therefor |
Examples of places where the subject matter of this place is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:
Disposal of radioactively contaminated liquid waste by storage in the ground |
Attention is drawn to the following places, which may be of interest for search:
Disposal of solid waste | |
Reclamation of contaminated soil | |
Storing fluid in natural or artificial cavities or chambers in the earth | |
Storing fluid in porous layers |
This place does not cover:
Drilling by liquid or gas jets | |
Drill bits with nozzle | |
Perforators using direct fluid action | |
Obtaining a slurry of minerals using nozzles |
Attention is drawn to the following places, which may be of interest for search:
Nozzles in general |
Attention is drawn to the following places, which may be of interest for search:
Generation of electric power per se |
Attention is drawn to the following places, which may be of interest for search:
Dump bailer | |
Compositions for in situ inhibition of corrosion in boreholes or wells | |
Inhibiting corrosion in general |
Attention is drawn to the following places, which may be of interest for search:
Manipulators in general |
Attention is drawn to the following places, which may be of interest for search:
Equipment for dwelling or working under water |
This place covers:
Methods and equipment for completion of wellbores and control and improvement of production.
This place does not cover:
Installations or methods for obtaining, collecting or distributing water |
Attention is drawn to the following places, which may be of interest for search:
Survey of wellbore pump systems | |
Obtaining oil-bearing deposits or soluble or meltable materials by mining techniques | |
Pumps | |
Pumping liquids and elastic fluids at the same time, e.g. multiphase pumps | |
Jet pumps |
Enhanced recovery methods (E21B 43/16), methods for stimulating production (E21B 43/25) and methods of fracturing (E21B 43/26) are sometimes carried out on the basis of specific chemical compositions. In these cases, the use of those compositions is classified respectively in C09K 8/58, C09K 8/60 and C09K 8/62.
This place covers:
Processes for inducing vibrations in earth formations using tools inside the borehole or at the surface.
Attention is drawn to the following places, which may be of interest for search:
Vibration generating arrangements for boreholes or wells |
This place does not cover:
Enhanced recovery methods for obtaining hydrocarbons using heat with combustion in situ |
Attention is drawn to the following places, which may be of interest for search:
Methods or devices for drawing-off gases for safety purposes in mines |
This place covers:
Methods specially adapted for obtaining from underwater installations;
Illustrative example of the subject matter classified in this place:
Subsea production equipment
Group E21B 43/01 covers all aspects of obtaining fluids or the like from underwater installations except for details of underwater well heads. Details of individual underwater well heads are classified in group E21B 33/035. A plurality of underwater satellite well heads connected to a central station is classified in group E21B 43/017.
Connectors used on underwater well heads are classified in group E21B 33/038, but the connection of a production flow line to an underwater well head is classified in group E21B 43/013.
Multiple classification across the groups mentioned in the paragraphs above may be appropriate.
Attention is drawn to the following places, which may be of interest for search:
Underwater separating arrangements |
This place covers:
- Subsoil filtering;
- Production screens and gravelling.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Perforators; Permeators | |
Chemical compositions for consolidating loose sand or the like around wells |
Attention is drawn to the following places, which may be of interest for search:
Sealing borehole walls |
Attention is drawn to the following places, which may be of interest for search:
Graveling of drinking water wells |
This place does not cover:
Expandable screens or liners |
This place covers:
Setting and securing of casings, screens, liners or the like in wells.
Running in and installation of tubulars, expandable tubulars.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Driving or forcing casings into boreholes, simultaneously drilling and casing boreholes | |
Setting of tools, packers or the like | |
Suspending casings in well heads |
Attention is drawn to the following places, which may be of interest for search:
Tube expanders in general |
This place covers:
Perforators and guns used to create apertures in casing or formation in order to establish a fluid communication with the reservoir for the production of oil or gas. Included are details about construction, ignition, communication and placement.
Illustrative example of subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Projectiles with shaped or hollow charge |
This place covers:
Ignition systems, e.g. electrically-actuated.
Attention is drawn to the following places, which may be of interest for search:
Releasing-joints between rod or the like and bit or between rod and rod or the like |
This place covers:
Production pumps, lifting wellbore fluids, production chokes.
Illustrative example of the subject matter classified in this place:
This place does not cover:
Valve arrangements for boreholes or wells | |
Methods for stimulating production |
This place covers:
The use of fluid from outside the well, or tool or system to move obtained fluid to the surface.
This place does not cover:
Monitoring of down-hole pump systems |
Attention is drawn to the following places, which may be of interest for search:
Pumping installations for raising fluid from great depths | |
Positive displacement pumps for downhole pumping | |
Non-positive displacement pumps for use in mining bore holes |
Attention is drawn to the following places, which may be of interest for search:
Jet pumps in general |
Attention is drawn to the following places, which may be of interest for search:
Driving of walking beam | |
Details of the walking beam |
This place covers:
Injecting fluids to mobilize hydrocarbons towards a production well.
Increasing the fraction of original oil recovered in place in a reservoir, including waterflooding, chemical flooding, gas injection, and thermal methods.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Fracturing | |
Obtaining slurry | |
Reclamation of contaminated soil in situ | |
Chemical compositions therefor |
This place does not cover:
Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection, in association with fracturing or crevice forming processes | |
Enhanced recovery methods for obtaining hydrocarbons using combustion in situ in association with fracturing processes or crevice forming processes |
Attention is drawn to the following places, which may be of interest for search:
Fracturing per se |
Attention is drawn to the following places, which may be of interest for search:
Heating, cooling or insulating wells | |
Compositions for enhanced recovery methods for obtaining hydrocarbons used in combination with generated heat |
Attention is drawn to the following places, which may be of interest for search:
Nuclear reactors |
Attention is drawn to the following places, which may be of interest for search:
Fracturing per se |
This place covers:
Treatment of production wells to increase production of hydrocarbons, typically hydraulic fracturing treatments and matrix treatments (acidizing).
Illustrative example of the subject matter classified in this place:
This place does not cover:
Methods for stimulating production by vibrating earth formations |
Attention is drawn to the following places, which may be of interest for search:
Mixing of treatment fluids | |
Dump bailers | |
Vibration generating arrangements | |
Compositions for stimulating production in drilling boreholes or wells by acting on the underground formation |
Attention is drawn to the following places, which may be of interest for search:
Mixing of fracturing fluids | |
Interconnecting wells by fracturing | |
Combustion in-situ in association with fracturing | |
Dissolving minerals in association with fracturing | |
Chemical compositions for forming crevices or fractures |
Attention is drawn to the following places, which may be of interest for search:
Combustion in situ using explosives |
Attention is drawn to the following places, which may be of interest for search:
Peaceful applications of nuclear explosive devices in general |
Attention is drawn to the following places, which may be of interest for search:
Chemical compositions for reinforcing fractures by propping |
This place covers:
Production of minerals other than hydrocarbons by dissolving them in situ with a dissolving agent.
Illustrative example of subject matter classified in this place:
This place does not cover:
Enhanced recovery methods for obtaining hydrocarbons using heat combined with solution mining of non-hydrocarbon minerals |
Attention is drawn to the following places, which may be of interest for search:
Methods or apparatus for cleaning boreholes or wells using chemical means for removing paraffins and other substances from the wellbore | |
Methods or apparatus for cleaning boreholes or wells using steerable or laterally extendable nozzles |
Attention is drawn to the following places, which may be of interest for search:
heating, cooling or insulating wells |
Attention is drawn to the following places, which may be of interest for search:
Fracturing per se |
This place does not cover:
Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection |
Attention is drawn to the following places, which may be of interest for search:
Heating, cooling or insulating arrangements for wells |
This place covers:
Obtention of combustible gas from mineral bodies, usually from coal underground.
This place does not cover:
Enhanced recovery methods for obtaining hydrocarbons using heat, the combustion being in situ |
In this place, the following terms or expressions are used with the meaning indicated:
Coal underground | A method for exploiting poor-quality mineral and thin seams by burning the mineral in place to produce combustible gas which can be burned to generate power or processed into chemicals and fuels |
Attention is drawn to the following places, which may be of interest for search:
Production satellite stations for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from underwater installations |
This place covers:
Separation of materials produced by the well.
Illustrative example of subject matter classified in this place:
This place covers:
Methods and devices such as sensors for monitoring drilling operations and for controlling the drilling operation in response to the information obtained.
Illustrative example of the subject matter classified in this place:
Attention is drawn to the following places, which may be of interest for search:
Automatic feeding from rack and connecting of drilling pipes | |
Controlling pressure or flow of drilling fluid | |
Control systems in general | |
Adaptive control systems |
Attention is drawn to the following places, which may be of interest for search:
Arrangements for automatic stopping for portable percussive tools |
Drilling time or rate of penetration measurements should only be classified in E21B 45/00 if specific measurement techniques are disclosed, or if the drilling time or rate of penetration data is relevant for the execution of another operation.
This place covers:
Specific applications in a downhole environment, including:
- Sensors or devices for obtaining data relative to the wellbore itself.
- Means for sending information from the well to the surface or from the surface into the well.
E21B 47/00 includes a wide range of measurements of very different nature. In case the disclosure relates to the specific construction or functioning of a sensor or measuring method, classification in one of the subclasses of G01 as specified in the subgroups should be considered.
Measurements of fluid properties as they flow into the wellbore are classified in E21B 47/10, but devices and methods for obtaining fluid samples are classified in E21B 49/08.
Telecommunication techniques used in an oilfield but other than between wellbore and surface, such as to communicate data from a plurality of producing wells to a centralised location, should not be classified in E21B 47/12, but in the corresponding group relative to its specific application, in this example oil production, if they have an influence in the operation of the production control. If a document mentions only the application to an oilfield or the like, and no specific application in an oilfield operation, but only the details of a communications system are disclosed, that document should be classified in H04L.
This place does not cover:
Monitoring pressure or flow of drilling fluid |
Attention is drawn to the following places, which may be of interest for search:
Testing of formations and obtaining samples of fluids or of borehole walls | |
Geophysical logging | |
Details, e.g. power supply systems for well logging instruments |
In this place, the following terms or expressions are used with the meaning indicated:
borehole | an unlined shaft drilled into the ground, typically for the purposes of extracting water, crude oil or natural gas. This is often referred to as the wellbore. |
Attention is drawn to the following places, which may be of interest for search:
Photographing internal surfaces, e.g. of pipes | |
Closed circuit television systems |
Attention is drawn to the following places, which may be of interest for search:
Measuring depth or liquid levelof boreholes or wells | |
Measuring diameter or relateddimensions at the borehole | |
Measuring volumes in general |
This place covers:
Processes or apparatus for tracking or examining the extent or integrity of the plugging or consolidating material.
Attention is drawn to the following places, which may be of interest for search:
Measuring temperature at borehole or well |
This place covers:
Processes or apparatus for determining the tensile or compressive force per cross-sectional area acting upon a pipe string or casing.
This place does not cover:
Locating blocked portions of pipes |
Attention is drawn to the following places, which may be of interest for search:
Measuring stress in general |
This place covers:
Devices for mounting a data collection instrument upon a boring tool, boring tool string or cable-carried tool. Devices for shielding down-hole data collection instruments from damage.
Attention is drawn to the following places, which may be of interest for search:
Flexible or expansible centering means per se | |
Setting or locking tools in boreholes or wells |
This place covers:
Processes or apparatus for shielding the data collection device against thermal effect, vibration, pressure, debris or the like.
Attention is drawn to the following places, which may be of interest for search:
Cooling or insulating arrangements for boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Cooling or insulating arrangements for boreholes or wells |
This place covers:
Processes or apparatus for measuring the inclination or orientation of boreholes or devices in boreholes or wells.
Attention is drawn to the following places, which may be of interest for search:
Clinometers or direction meters in general |
Attention is drawn to the following places, which may be of interest for search:
Seismic or acoustic prospecting |
Attention is drawn to the following places, which may be of interest for search:
Magnetic or electric prospecting |
This place covers:
Processes or apparatus for measuring the inclination or orientation of down-hole tools.
This place does not cover:
Determining slope or direction of the borehole |
This place covers:
Processes or apparatus for measuring the inclination, i.e. dip, or orientation, i.e. strike, of a drilled stratum, e.g. by using a specially adapted compass, e.g. a Brunton compass.
Attention is drawn to the following places, which may be of interest for search:
Apparatus for obtaining oriented cores | |
Formation testing | |
Geophysics; Detecting Masses or Objects |
This place covers:
Measurements of temperature or pressure when specific measurement techniques are disclosed, or if the temperature or pressure data is relevant for the execution of another operation.
Attention is drawn to the following places, which may be of interest for search:
Measuring diameter in general |
Attention is drawn to the following places, which may be of interest for search:
Measuring depth at borehole or well | |
Measuring borehole or well diameter |
This place covers:
Processes or apparatus for determining the whereabouts or position of objects in a borehole or well using magnetic attraction/repulsion force irregularities.
Attention is drawn to the following places, which may be of interest for search:
Investigating materials by investigating magnetic variables |
This place covers:
Processes or apparatus for determining if the pipes are sufficiently fluid-tight to prevent leakage or ingress of liquid or gas.
Processes or apparatus for detecting unwanted fluids flowing from the formation into the borehole.
Processes or apparatus for detecting the presence and properties of production fluids in the borehole.
Processes or apparatus for determining well debit or flow rate.
Processes or apparatus for measuring or detecting flow of oil, water, or gas, or measuring properties (e.g. electrical) of fluids.
Attention is drawn to the following places, which may be of interest for search:
Locating or determining the position of objects in boreholes or wells using impression packers | |
Flow measurement in general | |
Examining density and leaking in general |
Attention is drawn to the following places, which may be of interest for search:
Measuring temperature of boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Investigating fluid-tightness of structures by using fluid or vacuum |
This place covers:
Processes or apparatus in which an information or control signal is sent to or from equipment located in the borehole over an information transmission link.
This place covers:
Processes or apparatus in which the transmission link is through the ground.
This place does not cover:
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, by electromagnetic energy |
Attention is drawn to the following places, which may be of interest for search:
Magnetic or electric prospecting | |
Transmission systems in which the earth is the medium |
Attention is drawn to the following places, which may be of interest for search:
Light guides, e.g. optical fibres | |
Optical transmission in general |
This place covers:
Devices or carriers that are flowable with or through fluids in the well for performing measurements or for transmitting data, control or actuating signals.
Attention is drawn to the following places, which may be of interest for search:
Sampling in general | |
Geomodelling in general |
Attention is drawn to the following places, which may be of interest for search:
Investigating chemical or physical properties of materials per se |
This place covers:
Measuring wall stresses in the borehole through in-situ measurements only.
Attention is drawn to the following places, which may be of interest for search:
Investigation of mechanical properties of foundation soil | |
Measuring stresses on core or rock samples |
This place does not cover:
Measuring pressure of boreholes or wells |
Attention is drawn to the following places, which may be of interest for search:
Obtaining fluid samples or testing fluids |
Attention is drawn to the following places, which may be of interest for search:
Apparatus for obtaining undisturbed cores | |
Investigation of foundation soil in situ |
Attention is drawn to the following places, which may be of interest for search:
Underwater coring |
Attention is drawn to the following places, which may be of interest for search:
Drilling by use of explosives | |
Gun or shaped charge perforators |
Attention is drawn to the following places, which may be of interest for search:
Packers | |
Valve arrangements for boreholes or wells | |
Analysing pressure variations in an injection or production test |
Attention is drawn to the following places, which may be of interest for search:
Bailers |
Attention is drawn to the following places, which may be of interest for search:
Locating fluid leaks, intrusions or movements |
Subject matter classified here should include significant or specific details of modeling or simulating.
Attention is drawn to the following places, which may be of interest for search:
Fuzzy logic, artificial intelligence, neural networks per se |
Subject matter classified here should include significant/specific details of fuzzy logic, artificial intelligence, neural networks, or the like.