Version: 2023.05
Loading Scheme...
CPC | COOPERATIVE PATENT CLASSIFICATION | |||||||||
| E21B | EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying E21C; making shafts, driving galleries or tunnels E21D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS [2020-05] WARNINGS
|
Methods or apparatus for drilling [2013-01] |
| E21B 1/00 | NOTE
WARNING
|
| E21B 1/02 | . | Surface drives for drop hammers {or percussion drilling}, e.g. with a cable [2020-05] |
| E21B 1/04 | . . |
| E21B 1/12 | . | WARNING
|
| E21B 1/14 | . . |
E21B 1/16 | . . . | with spring-mounted reciprocating masses, e.g. with air cushion [2020-05] |
E21B 1/18 | . . . . | with elastic joining of the drive to the push-rod by double buffer springs [2020-05] |
E21B 1/20 | . . . | formed as centrifugal hammers [2020-05] |
| E21B 1/22 | . . |
| E21B 1/24 | . . |
E21B 1/26 | . . . | by liquid pressure [2020-05] |
E21B 1/28 | . . . . | working with pulses [2020-05] |
E21B 1/30 | . . . | by air, steam or gas pressure [2020-05] |
E21B 1/32 | . . . . | working with pulses [2020-05] |
E21B 1/34 | . . . . . | the impulse member being a piston of an internal-combustion engine [2020-05] |
| E21B 1/36 | . | Tool-carrier piston type, i.e. in which the tool is connected to an impulse member [2020-05] |
| E21B 1/38 | . | Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member [2020-05] |
| E21B 3/00 | Rotary drilling (drives used in the borehole E21B 4/00; rotary drilling machines in general B23B) [2020-05] WARNING
|
| E21B 3/02 | . | Surface drives for rotary drilling [2020-05] WARNING
|
| E21B 3/022 | . . | {Top drives} [2020-05] WARNING
|
| E21B 3/025 | . . | with a to-and-fro rotation of the tool [2020-05] WARNING
|
| E21B 3/03 | . . |
| E21B 3/035 | . . | with slipping or elastic transmission [2020-05] WARNING
|
| E21B 3/04 | . . |
E21B 3/045 | . . . | {movably mounted on the drilling structure or platform (derricks adapted to be moved on their substructure E21B 15/003)} [2020-05] |
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) [2013-01] |
E21B 4/00 | Drives for drilling, used in the borehole [2020-05] |
E21B 4/003 | . | {Bearing, sealing, lubricating details (for roller bits E21B 10/22)} [2020-05] |
E21B 4/006 | . | {Mechanical motion converting means, e.g. reduction gearings (E21B 4/10 takes precedence)} [2020-05] |
E21B 4/02 | . |
E21B 4/04 | . |
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) [2013-01] |
E21B 4/08 | . . | impact being obtained by gravity only, e.g. with lost-motion connection [2013-01] |
E21B 4/10 | . . | continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts [2013-01] |
E21B 4/12 | . . | Electrically operated hammers [2013-01] |
E21B 4/14 | . . | Fluid operated hammers [2013-01] |
E21B 4/145 | . . . | {of the self propelled-type, e.g. with a reverse mode to retract the device from the hole} [2013-01] |
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 [2013-01] |
E21B 4/18 | . | Anchoring or feeding in the borehole [2013-01] |
E21B 4/20 | . |
E21B 6/00 | Drives for drilling with combined rotary and percussive action (drives used in the borehole E21B 4/00; portable percussive machines with superimposed rotation B25D 16/00) [2020-05] |
E21B 6/02 | . | the rotation being continuous [2013-01] |
E21B 6/04 | . . | Separate drives for percussion and rotation [2013-01] |
E21B 6/06 | . | the rotation being intermittent, e.g. obtained by ratchet device [2017-01] |
E21B 6/08 | . . | Separate drives for percussion and rotation [2013-01] |
E21B 7/00 | Special methods or apparatus for drilling [2013-01] |
E21B 7/001 | . | {Drilling a non circular hole (excavating trenches E02F 5/02; cutting machines for slitting E21C 25/00)} [2013-01] |
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)} [2013-01] |
E21B 7/003 | . | {Drilling with mechanical conveying means (tunnelling E21D)} [2020-05] |
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)} [2013-01] |
E21B 7/007 | . | {Drilling by use of explosives (underwater drilling using explosives E21B 7/1245)} [2020-05] |
E21B 7/008 | . | {Drilling ice or a formation covered by ice} [2013-01] |
E21B 7/02 | . | Drilling rigs characterized by means for land transport {with their own drive}, e.g. skid mounting or wheel mounting (portable drilling rigs for use on underwater floors E21B 7/124) [2020-05] |
E21B 7/021 | . . | {With a rotary table, i.e. a fixed rotary drive for a relatively advancing tool} [2020-05] |
E21B 7/022 | . . | {Control of the drilling operation; Hydraulic or pneumatic means for activation or operation (control circuits for drilling masts E21B 15/045)} [2013-01] |
E21B 7/023 | . . | {the mast being foldable or telescopically retractable} [2013-01] |
E21B 7/024 | . . | {having means for adapting to inclined terrain; having means for stabilizing the vehicle while drilling} [2013-01] |
E21B 7/025 | . . | {Rock drills, i.e. jumbo drills} [2013-01] |
E21B 7/026 | . . | {having auxiliary platforms, e.g. for observation purposes} [2013-01] |
E21B 7/027 | . . | {Drills for drilling shallow holes, e.g. for taking soil samples or for drilling postholes} [2013-01] |
| E21B 7/028 | . . . | {the drilling apparatus being detachable from the vehicle, e.g. hand portable drills} [2020-05] WARNING
|
E21B 7/04 | . |
E21B 7/043 | . . | {for underwater installations} [2013-01] |
E21B 7/046 | . . | {horizontal drilling (drilling with mechanical conveying means E21B 7/003)} [2013-01] |
E21B 7/06 | . . | Deflecting the direction of boreholes [2020-05] |
E21B 7/061 | . . . | {the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock} [2013-01] |
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)} [2013-01] |
E21B 7/064 | . . . | {specially adapted drill bits therefor} [2013-01] |
E21B 7/065 | . . . | {using oriented fluid jets} [2013-01] |
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} [2013-01] |
E21B 7/068 | . . . | {drilled by a down-hole drilling motor (down-hole drives per se E21B 4/00, E21B 7/067 takes precedence)} [2013-01] |
E21B 7/10 | . . | Correction of deflected boreholes [2013-01] |
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; well heads specially adapted for underwater installations E21B 33/035) [2020-05] |
E21B 7/122 | . . | {with submersible vertically movable guide} [2013-01] |
E21B 7/124 | . . | with underwater tool drive prime mover, e.g. portable drilling rigs for use on underwater floors [2013-01] |
E21B 7/1245 | . . . | {using explosive means (anchors driven in by explosive charges B63B 21/28)} [2017-08] |
E21B 7/128 | . . | from floating support with independent underwater anchored guide base [2020-05] |
E21B 7/132 | . . | from underwater buoyant support [2013-01] |
E21B 7/136 | . . |
E21B 7/14 | . | Drilling by use of heat, e.g. flame drilling [2020-05] |
E21B 7/143 | . . | {underwater} [2013-01] |
E21B 7/146 | . . | {Thermal lances} [2013-01] |
E21B 7/15 | . . | of electrically generated heat [2013-01] |
E21B 7/16 | . | Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling [2013-01] |
E21B 7/18 | . | Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence; hydraulic monitors E21C 45/00) [2020-05] |
E21B 7/185 | . . | {underwater} [2013-01] |
E21B 7/20 | . | Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes (surface means for applying to-and-fro rotation movements to the casing E21B 3/025; 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}) [2020-05] |
E21B 7/201 | . . | {with helical conveying means} [2020-05] |
| E21B 7/205 | . . |
E21B 7/208 | . . | {using down-hole drives (E21B 7/203 and E21B 7/206 take precedence)} [2020-05] |
E21B 7/24 | . | Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B 1/00) [2013-01] |
| E21B 7/26 | . | Drilling without earth removal, e.g. with self-propelled burrowing devices (E21B 7/30 takes precedence; down-hole drives E21B 4/00 {, e.g. self-propelled fluid-operated hammers E21B 4/145}) [2020-05] WARNING
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| E21B 7/265 | . . | {Combined with earth removal} [2020-05] WARNING
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| E21B 7/267 | . . | {Drilling devices with senders, e.g. radio-transmitters for position of drilling tool} [2020-05] WARNING
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E21B 7/28 | . | Enlarging drilled holes, e.g. by counterboring (drill bits for enlarging the borehole E21B 10/26) [2013-01] |
E21B 7/30 | . . | without earth removal [2013-01] |
Drilling tools [2013-01] |
E21B 10/00 | Drill bits (specially adapted for deflecting the direction of boring E21B 7/064; with means for collecting substances E21B 27/00) [2013-01] |
E21B 10/003 | . | {with cutting edges facing in opposite axial directions} [2013-01] |
E21B 10/006 | . | {providing a cutting edge which is self-renewable during drilling} [2013-01] |
E21B 10/02 | . | Core bits (characterised by wear resisting parts E21B 10/46; obtaining undisturbed cores E21B 25/00) [2013-01] |
E21B 10/04 | . . | with core destroying means [2013-01] |
E21B 10/06 | . . | Roller core bits [2013-01] |
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) [2013-01] |
E21B 10/083 | . . | {with longitudinal axis, e.g. wobbling or nutating roller bit (longitudinal axis roller reamers E21B 10/30)} [2013-01] |
E21B 10/086 | . . | {with excentric movement} [2013-01] |
E21B 10/10 | . . |
E21B 10/12 | . . | with discs cutters [2013-01] |
E21B 10/14 | . . | combined with non-rolling cutters other than of leading-portion type [2013-01] |
E21B 10/16 | . . | characterised by tooth form or arrangement [2013-01] |
E21B 10/18 | . . | characterised by conduits or nozzles for drilling fluids (drilling fluid supply to the bearings E21B 10/23) [2013-01] |
E21B 10/20 | . . | characterised by detachable or adjustable parts, e.g. legs or axles (cross axle roller bits E21B 10/10) [2013-01] |
E21B 10/22 | . . | characterised by bearing, lubrication or sealing details [2013-01] |
E21B 10/23 | . . . | with drilling fluid supply to the bearings [2013-01] |
E21B 10/24 | . . . | characterised by lubricating details [2013-01] |
E21B 10/246 | . . . . | {with pumping means for feeding lubricant} [2013-01] |
E21B 10/25 | . . . | characterised by sealing details [2013-01] |
| 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) [2020-05] WARNING
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| E21B 10/265 | . . | {Bi-center drill bits, i.e. an integral bit and eccentric reamer used to simultaneously drill and underream the hole} [2020-05] WARNING
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| E21B 10/28 | . . | with non-expansible roller cutters [2020-05] WARNING
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| E21B 10/30 | . . . | Longitudinal axis roller reamers, e.g. reamer stabilisers [2020-05] WARNING
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| E21B 10/32 | . . | with expansible cutting tools [2020-05] WARNING
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| E21B 10/322 | . . . | {cutter shifted by fluid pressure (E21B 10/345 takes precedence)} [2020-05] WARNING
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| E21B 10/325 | . . . | {the cutter being shifted by a spring mechanism} [2020-05] WARNING
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| E21B 10/327 | . . . | {the cutter being pivoted about a longitudinal axis (E21B 10/34 takes precedence)} [2020-05] WARNING
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| E21B 10/34 | . . . | of roller-cutter type [2020-05] WARNING
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| E21B 10/345 | . . . . | {cutter shifted by fluid pressure} [2020-05] WARNING
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E21B 10/36 | . | Percussion drill bits ({with helical conveying portion E21B 10/445;} characterised by wear resisting parts E21B 10/46) [2020-05] |
E21B 10/38 | . . | characterised by conduits or nozzles for drilling fluids [2013-01] |
E21B 10/40 | . . | with leading portion [2013-01] |
| 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) [2020-05] WARNING
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| E21B 10/43 | . . | characterised by the arrangement of teeth or other cutting elements [2020-05] WARNING
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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 (E21B 10/42 takes precedence; drilling rods with helical structure E21B 17/22) [2020-05] |
E21B 10/46 | . | characterised by wear resisting parts, e.g. diamond inserts [2020-05] |
E21B 10/48 | . . | the bit being of core type [2020-05] |
E21B 10/485 | . . . | {with inserts in form of chisels, blades or the like} [2013-01] |
E21B 10/50 | . . | the bit being of roller type [2013-01] |
E21B 10/52 | . . . | with chisel- or button-type inserts [2020-05] |
E21B 10/54 | . . | the bit being of the rotary drag type, e.g. fork-type bits [2013-01] |
E21B 10/56 | . . |
| E21B 10/567 | . . . | with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts [2020-05] WARNING
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| E21B 10/5671 | . . . . | {with chip breaking arrangements} [2020-05] WARNING
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| E21B 10/5673 | . . . . | {having a non planar or non circular cutting face} [2020-05] WARNING
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E21B 10/5676 | . . . . | {having a cutting face with different segments, e.g. mosaic-type inserts} [2013-01] |
E21B 10/573 | . . . . | characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element [2020-05] |
E21B 10/5735 | . . . . . | {Interface between the substrate and the cutting element} [2013-01] |
E21B 10/58 | . . |
E21B 10/60 | . | characterised by conduits or nozzles for drilling fluids (for roller bits E21B 10/18; for percussion drill bits E21B 10/38) [2020-05] |
E21B 10/602 | . . | {the bit being a rotary drag type bit with blades} [2013-01] |
E21B 10/605 | . . | {the bit being a core-bit} [2013-01] |
E21B 10/61 | . . | characterised by the nozzle structure [2013-01] |
| 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 augers E21B 10/44) [2020-05] WARNING
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E21B 10/627 | . . | with plural detachable cutting elements [2013-01] |
E21B 10/633 | . . . | independently detachable [2013-01] |
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) [2013-01] |
E21B 10/66 | . . | the cutting element movable through the drilling pipe and laterally shiftable [2013-01] |
| E21B 11/00 | Other drilling tools [2020-05] WARNING
|
| E21B 11/005 | . | {Hand operated drilling tools (hand portable tools detachable from portable drilling rigs E21B 7/028)} [2020-05] WARNING
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E21B 11/02 | . | Boring rams (percussion drives used in the borehole E21B 4/06; percussion drill bits E21B 10/36) [2013-01] |
| E21B 11/04 | . | Boring grabs [2020-05] WARNING
|
E21B 11/06 | . | with driven cutting chains or similarly driven tools [2013-01] |
E21B 12/00 | Accessories for drilling tools [2020-05] |
E21B 12/02 | . | Wear indicators [2013-01] |
E21B 12/04 | . | Drill bit protectors [2013-01] |
E21B 12/06 | . | Mechanical cleaning devices [2013-01] |
Other equipment or details for drilling; Well equipment or well maintenance [2013-01] |
E21B 15/00 | Supports for the drilling machine, e.g. derricks or masts [2020-05] |
E21B 15/003 | . | {adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells} [2020-05] |
E21B 15/006 | . | {Means for anchoring the drilling machine to the ground} [2013-01] |
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) [2020-05] |
E21B 15/04 | . | specially adapted for directional drilling, e.g. slant hole rigs [2020-05] |
E21B 15/045 | . . | {Hydraulic, pneumatic or electric circuits for their positioning} [2013-01] |
E21B 17/00 |
E21B 17/003 | . | {with electrically conducting or insulating means (E21B 17/028 and E21B 17/023 take precedence)} [2013-01] |
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)} [2013-01] |
E21B 17/01 | . | Risers ({supporting a riser from a drilling or production platform E21B 19/004;} riser connectors {on well heads} E21B 33/038) [2020-05] |
E21B 17/012 | . . | {with buoyancy elements (E21B 17/015 takes precedence)} [2013-01] |
E21B 17/015 | . . | {Non-vertical risers, e.g. articulated or catenary-type} [2013-01] |
E21B 17/017 | . . | {Bend restrictors for limiting stress on risers} [2013-01] |
| E21B 17/02 | . | WARNING
|
E21B 17/021 | . . | {Devices for subsurface connecting or disconnecting by rotation} [2020-05] |
E21B 17/023 | . . | {Arrangements for connecting cables or wirelines to downhole devices} [2013-01] |
E21B 17/025 | . . . | {Side entry subs} [2013-01] |
E21B 17/026 | . . . | {Arrangements for fixing cables or wirelines to the outside of downhole devices} [2020-05] |
| E21B 17/028 | . . | {Electrical or electro-magnetic connections} [2020-05] WARNING
|
| E21B 17/0283 | . . . | {characterised by the coupling being contactless, e.g. inductive} [2020-05] WARNING
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| E21B 17/0285 | . . . | {characterised by electrically insulating elements} [2020-05] WARNING
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E21B 17/03 | . . | between drilling rod or pipe and drill motor {or surface drive}, e.g. between drilling rod and hammer [2020-05] |
| E21B 17/04 | . . | between rod {or the like} and bit or between rod and rod {or the like} [2020-05] WARNING
|
| E21B 17/041 | . . . | {specially adapted for coiled tubing} [2020-05] WARNING
|
E21B 17/042 | . . . | Threaded [2020-05] |
E21B 17/0423 | . . . . | {with plural threaded sections, e.g. with two-step threads} [2013-01] |
E21B 17/0426 | . . . . | {with a threaded cylindrical portion, e.g. for percussion rods} [2013-01] |
E21B 17/043 | . . . . | with locking means [2013-01] |
| E21B 17/046 | . . . | with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches [2020-05] WARNING
|
| E21B 17/0465 | . . . . | {characterised by radially inserted locking elements} [2020-05] WARNING
|
E21B 17/05 | . . . | Swivel joints [2013-01] |
E21B 17/06 | . . . | Releasing-joints, e.g. safety joints [2013-01] |
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) [2020-05] |
E21B 17/073 | . . . . | {with axial rotation} [2013-01] |
E21B 17/076 | . . . . | {between rod or pipe and drill bit} [2013-01] |
E21B 17/08 | . . | Casing joints [2013-01] |
| E21B 17/085 | . . . | {Riser connections (connectors for wellhead E21B 33/038)} [2020-05] WARNING
|
| E21B 17/0853 | . . . . | {Connections between sections of riser provided with auxiliary lines, e.g. kill and choke lines} [2020-05] WARNING
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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) [2020-05] |
E21B 17/1007 | . . | {for the internal surface of a pipe, e.g. wear bushings for underwater well-heads} [2013-01] |
E21B 17/1014 | . . | {Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well (E21B 17/1042 takes precedence)} [2013-01] |
E21B 17/1021 | . . . | {with articulated arms or arcuate springs} [2020-05] |
E21B 17/1028 | . . . . | {with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations} [2013-01] |
E21B 17/1035 | . . | {for plural rods, pipes or lines, e.g. for control lines} [2013-01] |
E21B 17/1042 | . . | {Elastomer protector or centering means} [2013-01] |
E21B 17/105 | . . . | {split type} [2013-01] |
E21B 17/1057 | . . | {Centralising devices with rollers or with a relatively rotating sleeve (E21B 17/1014 takes precedence)} [2013-01] |
E21B 17/1064 | . . . | {Pipes or rods with a relatively rotating sleeve} [2013-01] |
E21B 17/1071 | . . | {specially adapted for pump rods, e.g. sucker rods} [2013-01] |
E21B 17/1078 | . . | {Stabilisers or centralisers for casing, tubing or drill pipes (devices for off-center positioning E21B 17/10; E21B 17/1007 - E21B 17/1064 take precedence)} [2016-05] |
E21B 17/1085 | . . | {Wear protectors; Blast joints; Hard facing (wear protection included in centralising devices, see relevant subgroups)} [2013-01] |
E21B 17/1092 | . . | {Gauge section of drill bits} [2013-01] |
E21B 17/12 | . . | Devices for placing or drawing out wear protectors [2013-01] |
E21B 17/14 | . | Casing shoes {for the protection of the bottom of the casing} [2013-01] |
E21B 17/16 | . | Drill collars [2013-01] |
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) [2020-05] |
E21B 17/20 | . | Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables} [2020-05] |
E21B 17/203 | . . | {with plural fluid passages} [2013-01] |
E21B 17/206 | . . | {with conductors, e.g. electrical, optical} [2020-05] |
E21B 17/22 | . | Rods or pipes with helical structure (drill bits with helical conveying portion E21B 10/44) [2013-01] |
E21B 19/00 |
E21B 19/002 | . | {specially adapted for underwater drilling (E21B 19/09, E21B 19/143 take precedence)} [2020-05] |
E21B 19/004 | . . | {supporting a riser from a drilling or production platform} [2013-01] |
E21B 19/006 | . . . | {including heave compensators} [2013-01] |
E21B 19/008 | . | {Winding units, specially adapted for drilling operations} [2020-05] |
E21B 19/02 | . |
E21B 19/04 | . . | Hooks [2013-01] |
E21B 19/06 | . . | Elevators, i.e. rod- or tube-gripping devices [2020-05] |
E21B 19/07 | . . . |
| E21B 19/08 | . | Apparatus for feeding the rods or cables (E21B 19/22 takes precedence; automatic feed E21B 44/02; hoisting drums B66D); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods [2020-05] WARNING
|
| E21B 19/081 | . . | Screw-and-nut feed mechanisms [2020-05] WARNING
|
| E21B 19/083 | . . | Cam, rack or like feed mechanisms [2020-05] WARNING
|
| E21B 19/084 | . . | with flexible drawing means, e.g. cables [2020-05] WARNING
|
| E21B 19/086 | . . | WARNING
|
| E21B 19/087 | . . | by means of a swinging arm [2020-05] WARNING
|
| E21B 19/089 | . . | with a spring or an additional weight [2020-05] WARNING
|
| E21B 19/09 | . . | specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string (drilling-pipe telescoping joints E21B 17/07 {; heave compensators for supporting a riser E21B 19/006}) [2020-05] WARNING
|
| E21B 19/10 | . | Slips; Spiders {; Catching devices (rotary tables with master bushing or kelly bushing E21B 3/04)} [2020-05] WARNING
|
| E21B 19/102 | . . | {using rollers or spherical balls as load gripping elements} [2020-05] WARNING
|
E21B 19/12 | . | Rope clamps {; Rod, casings or tube clamps not secured to elevators} (rope clamps in general F16G 11/00) [2020-05] |
E21B 19/14 | . | Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole (E21B 19/20, E21B 19/22 take precedence) [2020-05] |
E21B 19/143 | . . | {specially adapted for underwater drilling} [2013-01] |
E21B 19/146 | . . | {Carousel systems, i.e. rotating rack systems} [2013-01] |
E21B 19/15 | . . | Racking of rods in horizontal position; Handling between horizontal and vertical position [2013-01] |
E21B 19/155 | . . . | {Handling between horizontal and vertical position} [2013-01] |
E21B 19/16 | . | Connecting or disconnecting pipe couplings or joints (E21B 19/20 takes precedence; pipe wrenches or the like B25B) [2017-08] |
E21B 19/161 | . . | {using a wrench or a spinner adapted to engage a circular section of pipe (E21B 19/168 takes precedence)} [2013-01] |
E21B 19/162 | . . . | {cathead actuated} [2013-01] |
E21B 19/163 | . . . | {piston-cylinder actuated} [2013-01] |
E21B 19/164 | . . . | {motor actuated (E21B 19/162 and E21B 19/163 take precedence)} [2013-01] |
E21B 19/165 | . . | {Control or monitoring arrangements therefor} [2013-01] |
E21B 19/166 | . . . | {Arrangements of torque limiters or torque indicators} [2013-01] |
E21B 19/167 | . . | {using a wrench adapted to engage a non circular section of pipe, e.g. a section with flats or splines} [2013-01] |
E21B 19/168 | . . | {using a spinner with rollers or a belt adapted to engage a well pipe} [2013-01] |
E21B 19/18 | . | Connecting or disconnecting drill bit and drilling pipe [2013-01] |
E21B 19/20 | . | Combined feeding from rack and connecting, e.g. automatically [2013-01] |
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)} [2013-01] |
E21B 19/24 | . | Guiding or centralising devices for drilling rods or pipes [2013-01] |
| E21B 21/00 | Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B 31/03; well drilling compositions C09K 8/02) [2020-05] WARNING
|
| E21B 21/001 | . | {specially adapted for underwater drilling (dual gradient drilling E21B 21/082)} [2020-05] WARNING
|
| 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)} [2020-05] WARNING
|
| E21B 21/003 | . | {Means for stopping loss of drilling fluid (plastering the borehole wall E21B 33/138)} [2020-05] WARNING
|
| E21B 21/01 | . | Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes (arrangements for treating drilling fluids E21B 21/06 {; waste disposal systems E21B 41/005}) [2020-05] WARNING
|
E21B 21/011 | . . | {Dust eliminating or dust removing while drilling} [2020-05] |
| E21B 21/012 | . . . | {using exhaust air from the drilling motor for blowing off the dust at the borehole entrance} [2020-05] WARNING
|
E21B 21/013 | . . . | {by liquids} [2020-05] |
E21B 21/0135 | . . . . | {Liquid flushing installations} [2020-05] |
E21B 21/014 | . . . | {Preventing exhaust air from the drill motor from blowing-off towards the working face} [2020-05] |
| E21B 21/015 | . . | Means engaging the bore entrance, e.g. hoods for collecting dust [2020-05] WARNING
|
| E21B 21/019 | . . | {Arrangements for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints} [2020-05] WARNING
|
| E21B 21/02 | . | Swivel joints in hose-lines [2020-05] WARNING
|
| E21B 21/06 | . | Arrangements for treating drilling fluids outside the borehole (treating steps per se, see the relevant subclasses) [2020-05] WARNING
|
E21B 21/062 | . . | {by mixing components} [2013-01] |
E21B 21/063 | . . | {by separating components} [2013-01] |
E21B 21/065 | . . . | {Separating solids from drilling fluids} [2013-01] |
E21B 21/066 | . . . . | {with further treatment of the solids, e.g. for disposal} [2013-01] |
E21B 21/067 | . . . | {Separating gases from drilling fluids} [2013-01] |
E21B 21/068 | . . | {using chemical treatment} [2013-01] |
E21B 21/07 | . . | for treating dust-laden gaseous fluids [2013-01] |
| 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) [2020-05] WARNING
|
| E21B 21/082 | . . | {Dual gradient systems, i.e. using two hydrostatic gradients or drilling fluid densities} [2020-05] WARNING
|
| E21B 21/085 | . . | {Underbalanced techniques, i.e. where borehole fluid pressure is below formation pressure} [2020-05] WARNING
|
| E21B 21/10 | . | WARNING
|
E21B 21/103 | . . | {Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus} [2013-01] |
E21B 21/106 | . . | {Valve arrangements outside the borehole, e.g. kelly valves} [2013-01] |
| E21B 21/12 | . | using drilling pipes with plural fluid passages, e.g. closed circulation systems (pipes with plural fluid passages E21B 17/18) [2020-05] WARNING
|
| E21B 21/14 | . | using liquids and gases, e.g. foams [2020-05] WARNING
|
| 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) [2020-05] WARNING
|
| E21B 21/18 | . | Preventing exhaust air from the drill motor from blowing-off towards the working face [2020-05] WARNING
|
E21B 23/00 | Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells (setting of casings, screens or liners E21B 43/10) [2013-01] |
E21B 23/001 | . | {Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole} [2020-05] |
E21B 23/004 | . | {Indexing systems for guiding relative movement between telescoping parts of downhole tools} [2013-01] |
E21B 23/006 | . . | {"J-slot" systems, i.e. lug and slot indexing mechanisms} [2013-01] |
E21B 23/01 | . | for anchoring the tools or the like (E21B 23/02 - E21B 23/06 take precedence; anchoring of drives in the borehole E21B 4/18) [2020-05] |
E21B 23/02 | . | for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E21B 23/03 - E21B 23/06 take precedence) [2016-05] |
| E21B 23/03 | . | for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets [2020-05] WARNING
|
| E21B 23/04 | . | operated by fluid means, e.g. actuated by explosion (E21B 23/06, E21B 23/08 take precedence) [2020-05] WARNING
|
| E21B 23/0411 | . . | {specially adapted for anchoring tools or the like to the borehole wall or to well tube} [2020-05] WARNING
|
| E21B 23/04115 | . . . | {using radial pistons} [2020-05] WARNING
|
| E21B 23/0412 | . . | {characterised by pressure chambers, e.g. vacuum chambers} [2020-05] WARNING
|
| E21B 23/0413 | . . | {using means for blocking fluid flow, e.g. drop balls or darts (using balls or the like for actuating downhole valves E21B 34/142)} [2020-05] WARNING
|
| E21B 23/0414 | . . | {using explosives} [2020-05] WARNING
|
| E21B 23/0415 | . . | {using particular fluids, e.g. electro-active liquids} [2020-05] WARNING
|
| E21B 23/0416 | . . | {characterised by force amplification arrangements} [2020-05] WARNING
|
| E21B 23/0417 | . . | {Down-hole non-explosive gas generating means, e.g. by chemical reaction} [2020-05] WARNING
|
| E21B 23/0418 | . . | {specially adapted for locking the tools in landing nipples or recesses} [2020-05] WARNING
|
| E21B 23/0419 | . . | {using down-hole motor and pump arrangements for generating hydraulic pressure} [2020-05] WARNING
|
| E21B 23/042 | . . | {using a single piston or multiple mechanically interconnected pistons} [2020-05] WARNING
|
| E21B 23/0421 | . . | {using multiple hydraulically interconnected pistons} [2020-05] WARNING
|
| E21B 23/0422 | . . | {characterised by radial pistons (using radial pistons for anchoring E21B 23/04115)} [2020-05] WARNING
|
| E21B 23/0423 | . . | {using step motors} [2020-05] WARNING
|
E21B 23/06 | . | for setting packers [2013-01] |
E21B 23/065 | . . | {setting tool actuated by explosion or gas generating means} [2013-01] |
E21B 23/08 | . | Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems (special provisions on heads therefor E21B 33/068; cementing plugs E21B 33/16; scrapers operated by fluid pressure E21B 37/04) [2020-05] |
E21B 23/10 | . . | Tools specially adapted therefor [2013-01] |
| E21B 23/12 | . . | Tool diverters [2020-05] WARNING
|
E21B 23/14 | . | for displacing a cable or cable-operated tool, e.g. for logging or perforating operations in deviated wells (by fluid pressure E21B 23/08; provision on well heads for introducing or removing cable-operated tools E21B 33/072, E21B 33/076) [2020-05] |
E21B 25/00 | Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (core bits E21B 10/02; using explosives or projectiles in boreholes E21B 49/04; side-wall sampling or coring E21B 49/06) [2013-01] |
E21B 25/005 | . | {Above ground means for handling the core, e.g. for extracting the core from the core barrel} [2013-01] |
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) [2013-01] |
E21B 25/04 | . . | the core receiver having a core forming cutting edge or element, e.g. punch type core barrels [2017-01] |
E21B 25/06 | . | the core receiver having a flexible liner or inflatable retaining means [2013-01] |
E21B 25/08 | . | Coating, freezing, consolidating cores (E21B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure [2013-01] |
E21B 25/10 | . |
E21B 25/12 | . . | of the sliding wedge type [2013-01] |
E21B 25/14 | . . | mounted on pivot transverse to core axis [2013-01] |
E21B 25/16 | . | for obtaining oriented cores [2013-01] |
E21B 25/18 | . | the core receiver being specially adapted for operation under water [2013-01] |
| E21B 27/00 | Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, {baskets or buckets} for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits [2020-05] WARNING
|
E21B 27/005 | . | {Collecting means with a strainer} [2013-01] |
E21B 27/02 | . | Dump bailers, i.e. containers for depositing substances, e.g. cement or acids [2013-01] |
E21B 27/04 | . | where the collecting or depositing means include helical conveying means {(drilling with helical conveying means combined with bucket-type container E21B 7/006)} [2020-05] |
E21B 28/00 | Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for drilling E21B 7/24; {for fishing for or freeing objects E21B 31/005;} for transmitting measuring-signals E21B 47/14; for geophysical measurements G01V 1/02) [2020-08] |
E21B 29/00 | Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows (perforators E21B 43/11); Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground {(by enlarging drilled holes or counterboring E21B 7/28)} [2013-01] |
E21B 29/002 | . | {Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe} [2013-01] |
E21B 29/005 | . . | {with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window} [2013-01] |
E21B 29/007 | . . | {with a radially-retracting cutter rotating outside the pipe} [2013-01] |
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) [2020-05] |
E21B 29/04 | . |
E21B 29/06 | . | Cutting windows, e.g. directional window cutters for whipstock operations ({E21B 29/005 and} E21B 29/08 take precedence) [2020-05] |
E21B 29/08 | . | Cutting or deforming pipes to control fluid flow {(shear type blow-out preventers E21B 33/063)} [2020-05] |
E21B 29/10 | . | Reconditioning of well casings, e.g. straightening [2013-01] |
E21B 29/12 | . |
| E21B 31/00 | Fishing for or freeing objects in boreholes or wells (provisions on well heads for introducing or removing objects E21B 33/068; locating or determining the position of objects in boreholes or wells E21B 47/09) [2020-05] WARNING
|
E21B 31/002 | . | {Destroying the objects to be fished, e.g. by explosive means} [2020-05] |
E21B 31/005 | . | {using vibrating or oscillating means} [2020-05] |
E21B 31/007 | . | {fishing tools with means for attaching comprising fusing or sticking} [2013-01] |
| E21B 31/03 | . | Freeing by flushing [2020-05] WARNING
|
| E21B 31/035 | . | {controlling differential pipe sticking} [2020-05] WARNING
|
E21B 31/06 | . | using magnetic means [2013-01] |
| E21B 31/08 | . | using junk baskets or the like [2020-05] WARNING
|
E21B 31/107 | . |
E21B 31/1075 | . . | {using explosives} [2013-01] |
E21B 31/113 | . . | hydraulically-operated [2013-01] |
E21B 31/1135 | . . . | {Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying escape of a restraining fluid} [2017-05] |
E21B 31/12 | . | Grappling tools, e.g. tongs or grabs [2013-01] |
E21B 31/125 | . . | {specially adapted for parted wire line or ropes} [2013-01] |
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}) [2020-05] |
E21B 31/16 | . . |
E21B 31/18 | . . | gripping externally, e.g. overshot [2013-01] |
E21B 31/20 | . . | gripping internally, e.g. fishing spears [2013-01] |
| E21B 33/00 | Sealing or packing boreholes or wells [2020-05] WARNING
|
E21B 33/02 | . | Surface sealing or packing [2013-01] |
E21B 33/03 | . . |
| E21B 33/035 | . . . | specially adapted for underwater installations (E21B 33/043, E21B 33/064, E21B 33/076 take precedence) [2020-05] WARNING
|
| E21B 33/0353 | . . . . | {Horizontal or spool trees, i.e. without production valves in the vertical main bore} [2020-05] WARNING
|
| E21B 33/0355 | . . . . | {Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads} [2020-05] WARNING
|
| E21B 33/037 | . . . . | Protective housings therefor [2020-05] WARNING
|
| E21B 33/0375 | . . . . . | {Corrosion protection means} [2020-05] WARNING
|
| 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) [2020-05] WARNING
|
| E21B 33/0385 | . . . . . | {electrical connectors} [2020-05] WARNING
|
| E21B 33/0387 | . . . . | {Hydraulic stab connectors} [2020-05] WARNING
|
E21B 33/04 | . . . | Casing heads; Suspending casings or tubings in well heads (setting of casings in wells E21B 43/10) [2013-01] |
E21B 33/0407 | . . . . | {with a suspended electrical cable} [2013-01] |
E21B 33/0415 | . . . . | {rotating or floating support for tubing or casing hanger} [2013-01] |
| E21B 33/0422 | . . . . | {a suspended tubing or casing being gripped by a slip or an internally serrated member} [2020-05] WARNING
|
E21B 33/043 | . . . . |
E21B 33/047 | . . . . | for plural tubing strings [2013-01] |
E21B 33/05 | . . . . | Cementing-heads, e.g. having provision for introducing cementing plugs [2013-01] |
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)} [2020-05] |
E21B 33/061 | . . . . | {Ram-type blow-out preventers, e.g. with pivoting rams} [2013-01] |
E21B 33/062 | . . . . . | {with sliding rams} [2013-01] |
E21B 33/063 | . . . . . . | {for shearing drill pipes (cutting of wireline E21B 29/04)} [2020-05] |
E21B 33/064 | . . . . | specially adapted for underwater well heads ({control systems for submerged well-heads E21B 33/0355;} connectors therefor E21B 33/038) [2020-05] |
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}) [2020-05] |
E21B 33/072 | . . . . |
E21B 33/076 | . . . . | specially adapted for underwater installations [2013-01] |
E21B 33/08 | . . | Wipers; Oil savers [2013-01] |
E21B 33/085 | . . . | {Rotatable packing means, e.g. rotating blow-out preventers} [2013-01] |
E21B 33/10 | . |
E21B 33/12 | . . |
E21B 33/1204 | . . . | {permanent; drillable} [2013-01] |
E21B 33/1208 | . . . | {characterised by the construction of the sealing or packing means (E21B 33/1277 takes precedence)} [2013-01] |
E21B 33/1212 | . . . . | {including a metal-to-metal seal element} [2013-01] |
E21B 33/1216 | . . . . | {Anti-extrusion means, e.g. means to prevent cold flow of rubber packing} [2013-01] |
E21B 33/122 | . . . | Multiple string packers [2013-01] |
E21B 33/124 | . . . | Units with longitudinally-spaced plugs for isolating the intermediate space [2013-01] |
E21B 33/1243 | . . . . | {with inflatable sleeves} [2013-01] |
E21B 33/1246 | . . . . . | {inflated by down-hole pumping means operated by a pipe string} [2013-01] |
E21B 33/126 | . . . | with fluid-pressure-operated elastic cup or skirt (E21B 33/122, E21B 33/124 take precedence) [2013-01] |
E21B 33/1265 | . . . . | {with mechanical slips} [2013-01] |
E21B 33/127 | . . . |
E21B 33/1272 | . . . . | {inflated by down-hole pumping means operated by a pipe string} [2013-01] |
E21B 33/1275 | . . . . | {inflated by down-hole pumping means operated by a down-hole drive} [2013-01] |
E21B 33/1277 | . . . . | {characterised by the construction or fixation of the sleeve} [2013-01] |
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}) [2020-05] |
E21B 33/1285 | . . . . | {by fluid pressure} [2013-01] |
E21B 33/129 | . . . | with mechanical slips for hooking into the casing (E21B 33/122, E21B 33/124 take precedence) [2013-01] |
E21B 33/1291 | . . . . | {anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks (E21B 33/1295 takes precedence)} [2013-01] |
E21B 33/1292 | . . . . . | {with means for anchoring against downward and upward movement} [2013-01] |
E21B 33/1293 | . . . . | {with means for anchoring against downward and upward movement (E21B 33/1291, E21B 33/1295 take precedence)} [2013-01] |
E21B 33/1294 | . . . . | {characterised by a valve, e.g. a by-pass valve} [2013-01] |
E21B 33/1295 | . . . . | actuated by fluid pressure [2013-01] |
E21B 33/12955 | . . . . . | {using drag blocks frictionally engaging the inner wall of the well} [2013-01] |
E21B 33/13 | . . | Methods or devices for cementing, for plugging holes, crevices, or the like (dump bailers E21B 27/02; chemical compositions therefor C09K 8/00) [2020-05] |
E21B 33/134 | . . . | Bridging plugs [2020-05] |
E21B 33/136 | . . . | Baskets, e.g. of umbrella type [2013-01] |
E21B 33/138 | . . . |
E21B 33/14 | . . . | for cementing casings into boreholes {(control of cementation quality or level E21B 47/005)} [2020-05] |
E21B 33/143 | . . . . | {for underwater installations} [2013-01] |
E21B 33/146 | . . . . | {Stage cementing, i.e. discharging cement from casing at different levels} [2013-01] |
| E21B 33/16 | . . . . | using plugs for isolating cement charge; Plugs therefor {(stage cementing E21B 33/146; spacer compositions C09K 8/424)} [2020-05] WARNING
|
| E21B 33/165 | . . . . . | {Cementing plugs specially adapted for being released down-hole (cementing heads E21B 33/05)} [2020-05] WARNING
|
| E21B 33/167 | . . . . . | {Cementing plugs provided with anti-rotation mechanisms, e.g. for easier drill-out} [2020-05] WARNING
|
E21B 34/00 | Valve arrangements for boreholes or wells (in drilling fluid circulation systems E21B 21/10; blow-out preventers E21B 33/06; oil flow regulating apparatus E21B 43/12; valves in general F16K) [2020-05] |
| E21B 34/02 | . | in well heads [2020-05] WARNING
|
| E21B 34/025 | . . | {Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid flow} [2020-05] WARNING
|
| E21B 34/04 | . . | in underwater well heads [2020-05] WARNING
|
| 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} [2020-05] WARNING
|
E21B 34/06 | . | in wells [2013-01] |
E21B 34/063 | . . | {Valve or closure with destructible element, e.g. frangible disc (E21B 34/103 takes precedence)} [2013-01] |
E21B 34/066 | . . | {electrically actuated} [2013-01] |
E21B 34/08 | . . |
E21B 34/085 | . . . | {with time-delay systems, e.g. hydraulic impedance mechanisms} [2013-01] |
E21B 34/10 | . . | operated by control fluid supplied from outside the borehole ({by a dropped ball or piston E21B 34/142;} control means being outside the borehole E21B 34/16) [2020-05] |
E21B 34/101 | . . . | {with means for equalizing fluid pressure above and below the valve} [2013-01] |
E21B 34/102 | . . . | {with means for locking the closing element in open or closed position (E21B 34/105 and E21B 34/108 take precedence)} [2017-05] |
E21B 34/103 | . . . . | {with a shear pin} [2013-01] |
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} [2013-01] |
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} [2013-01] |
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)} [2013-01] |
E21B 34/108 | . . . | {with time delay systems, e.g. hydraulic impedance mechanisms} [2013-01] |
E21B 34/12 | . . | operated by movement of casings or tubings [2013-01] |
E21B 34/125 | . . . | {with time delay systems, e.g. hydraulic impedance mechanisms} [2013-01] |
| E21B 34/14 | . . | operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools {(E21B 34/066 takes precedence)} [2020-05] WARNING
|
| E21B 34/142 | . . . | {unsupported or free-falling elements, e.g. balls, plugs, darts or pistons} [2020-05] WARNING
|
E21B 34/16 | . | Control means therefor being outside the borehole {(control systems for submerged well heads E21B 33/0355)} [2020-05] |
E21B 35/00 | Methods or apparatus for preventing or extinguishing fires (cutting or deforming pipes to control fluid flow E21B 29/08; controlling flow of fluid to or in wells E21B 43/12; fire fighting in general A62C, A62D) [2013-01] |
E21B 36/00 | Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (drilling by use of heat E21B 7/14; secondary recovery methods using heat E21B 43/24) [2013-01] |
E21B 36/001 | . | {Cooling arrangements} [2013-01] |
E21B 36/003 | . | {Insulating arrangements} [2013-01] |
E21B 36/005 | . | {Heater surrounding production tube} [2013-01] |
E21B 36/006 | . | {Combined heating and pumping means} [2013-01] |
E21B 36/008 | . | {using chemical heat generating means} [2013-01] |
E21B 36/02 | . | using burners [2013-01] |
E21B 36/025 | . . | {the burners being above ground or outside the bore hole} [2013-01] |
E21B 36/04 | . | using electrical heaters [2013-01] |
E21B 37/00 | Methods or apparatus for cleaning boreholes or wells (E21B 21/00 takes precedence; {bailers E21B 27/00;} cleaning pipes in general B08B 9/02) [2013-01] |
E21B 37/02 | . | Scrapers specially adapted therefor [2013-01] |
E21B 37/04 | . . | operated by fluid pressure, e.g. free-piston scrapers (operating other tools by fluid pressure E21B 23/08) [2013-01] |
E21B 37/045 | . . . | {Free-piston scrapers} [2013-01] |
E21B 37/06 | . | using chemical means for preventing, limiting {or eliminating} the deposition of paraffins or like substances (chemical compositions therefor C09K 8/52) [2013-01] |
E21B 37/08 | . | cleaning in situ of down-hole filters, screens, {e.g. casing perforations,} or gravel packs (E21B 37/06 takes precedence) [2013-01] |
E21B 37/10 | . | Well swabs [2020-05] |
| E21B 40/00 | Tubing catchers, automatically arresting the fall of oil-well tubing {(preventing small objects from falling into the borehole E21B 41/0021)} [2020-05] WARNING
|
| E21B 40/001 | . | {in the borehole (anchoring tools in the borehole E21B 23/01)} [2020-05] WARNING
|
| E21B 41/00 | Equipment or details not covered by groups E21B 15/00 - E21B 40/00 [2020-05] WARNING
|
E21B 41/0007 | . | {for underwater installations (E21B 41/005, E21B 41/04, E21B 41/06, E21B 41/08, E21B 41/10 take precedence)} [2013-01] |
E21B 41/0014 | . . | {Underwater well locating or reentry systems} [2013-01] |
E21B 41/0021 | . | {Safety devices, e.g. for preventing small objects from falling into the borehole} [2013-01] |
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} [2020-05] |
E21B 41/0042 | . . | {characterised by sealing the junction between a lateral and a main bore} [2013-01] |
E21B 41/005 | . | {Waste disposal systems} [2020-05] |
E21B 41/0057 | . . | {Disposal of a fluid by injection into a subterranean formation} [2013-01] |
E21B 41/0064 | . . . | {Carbon dioxide sequestration (storing fluids in porous layers B65G 5/005)} [2013-01] |
E21B 41/0071 | . . | {Adaptation of flares, e.g. arrangements of flares in offshore installations (flares of waste gases or noxious gases F23G 7/08)} [2013-01] |
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)} [2020-05] |
E21B 41/0085 | . | {Adaptations of electric power generating means for use in boreholes} [2020-05] |
| E21B 41/0092 (Frozen) | . | {Methods relating to program engineering, design or optimisation} [2020-05] WARNING
|
| E21B 41/0099 | . | {specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates} [2020-05] WARNING
|
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) [2013-01] |
E21B 41/04 | . | Manipulators for underwater operations, e.g. temporarily connected to well heads (manipulators in general B25J) [2013-01] |
E21B 41/06 | . | Work chambers for underwater operations, e.g. temporarily connected to well heads (in general B63C 11/00) [2013-01] |
E21B 41/08 | . | Underwater guide bases, e.g. drilling templates; Levelling thereof [2020-08] |
E21B 41/10 | . | Guide posts, e.g. releasable; Attaching guide lines to underwater guide bases [2013-01] |
Obtaining fluids from wells [2013-01] |
| E21B 43/00 | Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B; obtaining oil-bearing deposits or soluble or meltable materials by mining techniques E21C 41/00; pumps F04) [2020-05] WARNING
|
E21B 43/003 | . | {Vibrating earth formations} [2020-05] |
E21B 43/006 | . | {Production of coal-bed methane (E21B 43/243 takes precedence)} [2020-05] |
E21B 43/01 | . | specially adapted for obtaining from underwater installations (underwater well heads E21B 33/035) [2013-01] |
E21B 43/0107 | . . | {Connecting of flow lines to offshore structures (E21B 43/013 takes precedence)} [2013-01] |
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)} [2013-01] |
E21B 43/013 | . . | Connecting a production flow line to an underwater well head [2017-08] |
E21B 43/0135 | . . . | {using a pulling cable} [2013-01] |
| 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) [2020-05] WARNING
|
| E21B 43/0175 | . . . | {Hydraulic schemes for production manifolds} [2020-05] WARNING
|
E21B 43/02 | . | Subsoil filtering (E21B 43/11 takes precedence; chemical compositions for consolidating loose sand or the like around wells C09K 8/56) [2020-05] |
E21B 43/025 | . . | {Consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof} [2020-05] |
E21B 43/04 | . . | Gravelling of wells [2013-01] |
E21B 43/045 | . . . | {Crossover tools} [2013-01] |
E21B 43/08 | . . |
E21B 43/082 | . . . | {Screens comprising porous materials, e.g. prepacked screens} [2013-01] |
E21B 43/084 | . . . | {Screens comprising woven materials, e.g. mesh or cloth} [2013-01] |
E21B 43/086 | . . . | {Screens with preformed openings, e.g. slotted liners (comprising porous materials E21B 43/082)} [2013-01] |
E21B 43/088 | . . . | {Wire screens (comprising porous materials E21B 43/082; comprising woven materials E21B 43/084)} [2013-01] |
E21B 43/10 | . . | Setting of casings, screens, liners {or the like} in wells (driving or forcing casings into boreholes, simultaneously drilling and casing boreholes E21B 7/20; setting of tools, packers or the like E21B 23/00; suspending casings in well heads E21B 33/04) [2013-01] |
E21B 43/101 | . . . | {for underwater installations} [2013-01] |
E21B 43/103 | . . . | {of expandable casings, screens, liners, or the like} [2013-01] |
E21B 43/105 | . . . . | {Expanding tools specially adapted therefor} [2013-01] |
E21B 43/106 | . . . . | {Couplings or joints therefor} [2013-01] |
E21B 43/108 | . . . . | {Expandable screens or perforated liners} [2020-05] |
E21B 43/11 | . | Perforators; Permeators [2013-01] |
E21B 43/112 | . . | Perforators with extendable perforating members, e.g. actuated by fluid means [2017-01] |
E21B 43/114 | . . | Perforators using direct fluid action {on the wall to be perforated}, e.g. abrasive jets [2013-01] |
E21B 43/116 | . . | Gun or shaped-charge perforators [2020-05] |
E21B 43/117 | . . . |
E21B 43/118 | . . . | characterised by lowering in vertical position and subsequent tilting to operating position [2013-01] |
E21B 43/1185 | . . . | Ignition systems [2013-01] |
E21B 43/11852 | . . . . | {hydraulically actuated} [2013-01] |
E21B 43/11855 | . . . . | {mechanically actuated, e.g. by movement of a wireline or a drop-bar (E21B 43/11852 takes precedence)} [2013-01] |
E21B 43/11857 | . . . . | {firing indication systems} [2013-01] |
| E21B 43/119 | . . | Details, e.g. for locating perforating place or direction [2020-05] WARNING
|
| E21B 43/1193 | . . . | {Dropping perforation guns after gun actuation} [2020-05] WARNING
|
E21B 43/1195 | . . . | {Replacement of drilling mud; decrease of undesirable shock waves} [2013-01] |
E21B 43/12 | . | Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B 43/25 takes precedence; valve arrangements E21B 34/00) [2013-01] |
| E21B 43/121 | . . | {Lifting well fluids (monitoring of down-hole pump systems E21B 47/008)} [2020-05] WARNING
|
| E21B 43/122 | . . . | {Gas lift} [2020-05] WARNING
|
| E21B 43/123 | . . . . | {Gas lift valves} [2020-05] WARNING
|
| E21B 43/1235 | . . . . . | {characterised by electromagnetic actuation} [2020-05] WARNING
|
| E21B 43/124 | . . . | {Adaptation of jet-pump systems} [2020-05] WARNING
|
| 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)} [2020-05] WARNING
|
| E21B 43/127 | . . . . | {Adaptations of walking-beam pump systems} [2020-05] WARNING
|
| E21B 43/128 | . . . | {Adaptation of pump systems with down-hole electric drives} [2020-05] WARNING
|
| 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)} [2020-05] WARNING
|
| E21B 43/13 | . . . | {specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds} [2020-05] WARNING
|
E21B 43/14 | . | Obtaining from a multiple-zone well [2013-01] |
| E21B 43/16 | . | Enhanced recovery methods for obtaining hydrocarbons (fracturing E21B 43/26; obtaining slurry E21B 43/29; reclamation of contaminated soil in situ B09C {; chemical compositions therefor C09K 8/58}) [2020-05] WARNING
|
E21B 43/162 | . . | {Injecting fluid from longitudinally spaced locations in injection well} [2013-01] |
E21B 43/164 | . . | {Injecting CO2 or carbonated water (in combination with organic material C09K 8/594)} [2013-01] |
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)} [2013-01] |
E21B 43/168 | . . . | {Injecting a gaseous medium} [2013-01] |
E21B 43/17 | . . | Interconnecting two or more wells by fracturing or otherwise attacking the formation ({E21B 43/2405,} E21B 43/247 take precedence) [2013-01] |
E21B 43/18 | . . | Repressuring or vacuum methods [2013-01] |
E21B 43/20 | . . | Displacing by water [2013-01] |
E21B 43/24 | . . | using heat, e.g. steam injection (heating, cooling or insulating wells E21B 36/00 {; in combination with organic material C09K 8/592}) [2013-01] |
E21B 43/2401 | . . . | {by means of electricity} [2013-01] |
E21B 43/2403 | . . . | {by means of nuclear energy} [2020-05] |
E21B 43/2405 | . . . | {in association with fracturing or crevice forming processes (E21B 43/247 takes precedence)} [2013-01] |
E21B 43/2406 | . . . | {Steam assisted gravity drainage [SAGD]} [2013-01] |
E21B 43/2408 | . . . . | {SAGD in combination with other methods} [2020-08] |
E21B 43/241 | . . . | combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale [2013-01] |
E21B 43/243 | . . . | Combustion in situ [2013-01] |
E21B 43/247 | . . . . | in association with fracturing processes {or crevice forming processes} [2013-01] |
E21B 43/248 | . . . . . | using explosives [2013-01] |
E21B 43/25 | . | Methods for stimulating production (dump bailers E21B 27/02; vibration generating arrangements E21B 28/00; {by vibrating earth formations E21B 43/003;} chemical compositions therefor C09K 8/60) [2020-05] |
E21B 43/255 | . . | {including the injection of a gaseous medium as treatment fluid into the formation} [2013-01] |
| E21B 43/26 | . . | WARNING
|
| E21B 43/2605 | . . . | {using gas or liquefied gas} [2020-05] WARNING
|
| E21B 43/2607 | . . . | {Surface equipment specially adapted for fracturing operations} [2020-05] WARNING
|
E21B 43/261 | . . . | {Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation} [2013-01] |
E21B 43/263 | . . . |
E21B 43/267 | . . . |
| E21B 43/27 | . . . | by use of eroding chemicals, e.g. acids [2020-05] WARNING
|
E21B 43/28 | . | Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B 43/241 takes precedence) [2020-05] |
E21B 43/281 | . . | {using heat} [2020-05] |
E21B 43/283 | . . | {in association with a fracturing process} [2013-01] |
E21B 43/285 | . | Melting minerals, e.g. sulfur (E21B 43/24 takes precedence; heating, cooling or insulating arrangements for wells E21B 36/00) [2013-01] |
E21B 43/29 | . | Obtaining a slurry of minerals, e.g. by using nozzles [2013-01] |
E21B 43/292 | . . | {using steerable or laterally extendable nozzles} [2013-01] |
E21B 43/295 | . | Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B 43/243 takes precedence) [2013-01] |
E21B 43/30 | . | Specific pattern of wells, e.g. optimizing the spacing of wells (production satellite stations E21B 43/017) [2013-01] |
E21B 43/305 | . . | {comprising at least one inclined or horizontal well} [2013-01] |
E21B 43/32 | . | Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells [2020-05] |
| E21B 43/34 | . | Arrangements for separating materials produced by the well (separating apparatus per se, see the relevant subclasses) [2020-05] WARNING
|
| E21B 43/35 | . . | {specially adapted for separating solids (down-hole drilling fluid separation systems E21B 21/002; separating solids from drilling fluids E21B 21/065)} [2020-05] WARNING
|
| E21B 43/36 | . . | WARNING
|
| E21B 43/38 | . . | in the well [2020-05] WARNING
|
| E21B 43/385 | . . . | {by reinjecting the separated materials into an earth formation in the same well} [2020-05] WARNING
|
| E21B 43/40 | . . | Separation associated with re-injection of separated materials {(E21B 43/385 takes precedence)} [2020-05] WARNING
|
Automatic control, surveying or testing [2013-01] |
E21B 44/00 | Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems (for non-automatic drilling control, see the operation controlled; automatic feeding from rack and connecting of drilling pipes E21B 19/20; controlling pressure or flow of drilling fluid E21B 21/08); 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) [2020-05] |
E21B 44/005 | . | {Below-ground automatic control systems} [2013-01] |
E21B 44/02 | . |
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 47/007)} [2020-05] |
E21B 44/06 | . . | in response to the flow or pressure of the motive fluid of the drive [2013-01] |
E21B 44/08 | . . | in response to the amplitude of the movement of the percussion tool, e.g. jump or recoil [2013-01] |
E21B 44/10 | . | Arrangements for automatic stopping when the tool is lifted from the working face [2020-05] |
E21B 45/00 | Measuring the drilling time or rate of penetration [2013-01] |
| E21B 47/00 | WARNING
|
E21B 47/001 | . | for underwater installation [2020-05] |
| E21B 47/002 | . | by visual inspection [2020-05] WARNING
|
| E21B 47/0025 | . . | {generating an image of the borehole wall using down-hole measurements, e.g. acoustic or electric} [2020-05] WARNING
|
E21B 47/003 | . |
E21B 47/005 | . | Monitoring or checking of cementation quality or level [2020-05] |
| E21B 47/006 | . | {Detection of corrosion or deposition of substances} [2020-05] WARNING
|
E21B 47/007 | . | Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B 47/09) [2020-05] |
E21B 47/008 | . | Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions [2020-05] |
E21B 47/009 | . . | Monitoring of walking-beam pump systems [2020-05] |
| E21B 47/01 | . | Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like [2020-05] NOTE
WARNING
|
| E21B 47/013 | . . | Devices specially adapted for supporting measuring instruments on drill bits [2020-05] WARNING
|
| E21B 47/017 | . . | Protecting measuring instruments [2020-05] WARNING
|
| E21B 47/0175 | . . . | {Cooling arrangements} [2020-05] WARNING
|
E21B 47/02 | . | Determining slope or direction [2020-05] |
E21B 47/022 | . . | of the borehole, e.g. using geomagnetism [2020-05] |
E21B 47/0224 | . . . | using seismic or acoustic means [2020-05] |
E21B 47/0228 | . . . | using electromagnetic energy or detectors therefor [2020-05] |
E21B 47/0232 | . . . . | at least one of the energy sources or one of the detectors being located on or above the ground surface [2020-05] |
E21B 47/0236 | . . . | using a pendulum [2020-05] |
E21B 47/024 | . . |
E21B 47/026 | . . | of penetrated ground layers [2020-05] |
E21B 47/04 | . | Measuring depth or liquid level [2020-05] |
E21B 47/047 | . . |
E21B 47/053 | . . | using radioactive markers [2020-05] |
E21B 47/06 | . | Measuring temperature or pressure [2020-05] |
E21B 47/07 | . . | Temperature [2020-05] |
E21B 47/08 | . | Measuring diameters or related dimensions at the borehole [2020-05] |
E21B 47/085 | . . | using radiant means, e.g. acoustic, radioactive or electromagnetic [2020-05] |
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 [2020-05] |
E21B 47/092 | . . | by detecting magnetic anomalies [2020-05] |
E21B 47/095 | . . | by detecting an acoustic anomalies, e.g. using mud-pressure pulses [2020-05] |
E21B 47/098 | . . | using impression packers, e.g. to detect recesses or perforations [2020-05] |
| E21B 47/10 | . | WARNING
|
E21B 47/103 | . . |
E21B 47/107 | . . | using acoustic means [2020-05] |
| E21B 47/11 | . . | using tracers; using radioactivity [2020-05] WARNING
|
| E21B 47/111 | . . . | {using radioactivity} [2020-05] WARNING
|
| E21B 47/113 | . . | using electrical indications; using light radiations [2020-05] WARNING
|
| E21B 47/114 | . . . | {using light radiation} [2020-05] WARNING
|
E21B 47/117 | . . | Detecting leaks, e.g. from tubing, by pressure testing [2020-05] |
| 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 [2020-05] WARNING
|
E21B 47/125 | . . |
E21B 47/13 | . . | by electromagnetic energy, e.g. radio frequency [2020-05] |
| E21B 47/138 | . . | {Devices entrained in the flow of well-bore fluid for transmitting data, control or actuation signals} [2020-05] WARNING
|
E21B 47/14 | . . | using acoustic waves [2013-01] |
E21B 47/16 | . . . | through the drill string or casing {, e.g. by torsional acoustic waves} [2017-08] |
E21B 47/18 | . . . | through the well fluid {, e.g. mud pressure pulse telemetry} [2017-08] |
E21B 47/20 | . . . . | by modulation of mud waves, e.g. by continuous modulation [2020-05] |
E21B 47/22 | . . . . | by negative mud pulses using a pressure relieve valve between drill pipe and annulus [2020-05] |
E21B 47/24 | . . . . | by positive mud pulses using a flow restricting valve within the drill pipe [2020-05] |
E21B 47/26 | . | Storing data down-hole, e.g. in a memory or on a record carrier [2020-05] |
E21B 49/00 | Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells (sampling in general G01N 1/00) [2013-01] |
E21B 49/001 | . | {specially adapted for underwater installations} [2013-01] |
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)} [2017-08] |
E21B 49/005 | . | {Testing the nature of borehole walls or the formation by using drilling mud or cutting data} [2020-05] |
E21B 49/006 | . | {Measuring wall stresses in the borehole} [2020-05] |
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)} [2020-05] |
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) [2013-01] |
E21B 49/025 | . . | {of underwater soil, e.g. with grab devices} [2020-05] |
E21B 49/04 | . . | using explosives in boreholes; using projectiles penetrating the wall [2020-05] |
E21B 49/06 | . . | using side-wall drilling tools {pressing} or scrapers [2020-05] |
E21B 49/08 | . | Obtaining fluid samples or testing fluids, in boreholes or wells [2020-05] |
| E21B 49/081 | . . | {with down-hole means for trapping a fluid sample (E21B 49/10 takes precedence)} [2020-05] WARNING
|
| E21B 49/0813 | . . . | {Sampling valve actuated by annulus pressure changes} [2020-05] WARNING
|
| E21B 49/0815 | . . . | {Sampling valve actuated by tubing pressure changes} [2020-05] WARNING
|
E21B 49/082 | . . . | {Wire-line fluid samplers (E21B 49/083 takes precedence)} [2013-01] |
| 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} [2020-05] WARNING
|
E21B 49/084 | . . | {with means for conveying samples through pipe to surface} [2013-01] |
E21B 49/086 | . . | {Withdrawing samples at the surface} [2013-01] |
| E21B 49/087 | . . | {Well testing, e.g. testing for reservoir productivity or formation parameters} [2020-05] WARNING
|
| E21B 49/0875 | . . . | {determining specific fluid parameters} [2020-05] WARNING
|
E21B 49/088 | . . . | {combined with sampling} [2013-01] |
E21B 49/10 | . . | using side-wall fluid samplers or testers [2013-01] |
| E21B 2200/00 | Special features related to earth drilling for obtaining oil, gas or water [2020-05] WARNING
|
| E21B 2200/01 | . | Sealings characterised by their shape [2020-05] WARNING
|
| E21B 2200/02 | . | Down-hole chokes or valves for variably regulating fluid flow [2020-05] WARNING
|
| E21B 2200/03 | . | Valves operated by gear mechanisms, e.g. rack and pinion mechanisms [2020-05] WARNING
|
| E21B 2200/04 | . | Ball valves [2020-05] WARNING
|
| E21B 2200/05 | . | Flapper valves [2020-05] WARNING
|
| E21B 2200/06 | . | Sleeve valves [2020-05] WARNING
|
| E21B 2200/08 | . | Down-hole devices using materials which decompose under well-bore conditions [2020-05] WARNING
|
| E21B 2200/09 | . | Detecting, eliminating, preventing liquid slugs in production pipes [2020-05] WARNING
|
| E21B 2200/20 | . | Computer models or simulations, e.g. for reservoirs under production, drill bits [2020-05] WARNING
|
| E21B 2200/22 | . | Fuzzy logic, artificial intelligence, neural networks or the like [2020-05] WARNING
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