Patents-Review.com
ClassID:

135397 ⎘

E21B21/12 - CPC Classification

Classification description:

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems

Recent Application in this class:
#1
20250250863
2025-08-07

PULSED POWER DRILLING WITH MULTIPLE SELECTIVE DRILLING FLUIDS

 #2
20250230721
2025-07-17

DRILL STRING AND COMPONENTS THEREFOR

 #3
20250172062
2025-05-29

COAL MINING SYSTEM AND METHOD OF DUAL CIRCULATION DRILLING WITH MECHANICAL REAMING AND ABRASIVE JET

 #4
20250163768
2025-05-22

SYSTEMS AND METHODS FOR DETERMINING WEAR OF DOWNHOLE TOOLS

 #5
20250101808
2025-03-27

PULSED POWER DRILLING WITH MULTIPLE SELECTIVE DRILLING FLUIDS

 #6
20240376788
2024-11-14

DUAL TUBE DRILL STRING COMPONENTS

 #7
20240229638
2024-07-11

PERCUSSION DRILLING APPARATUS AND METHOD FOR MEASUREMENT WHILE DRILLING

 #8
20240218753
2024-07-04

Milling and wellbore metal debris recovery assembly

 #9
20240167341
2024-05-23

Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels

 #10
20240133289
2024-04-25

PERCUSSION DRILLING APPARATUS AND METHOD FOR MEASUREMENT WHILE DRILLING

 #11
20240060371
2024-02-22

METHOD AND APPARATUS FOR REMOVING DEBRIS FROM A DRILL HOLE DURING DRILLING

 #12
20230287742
2023-09-14

Method and device for laser drilling

 #13
20230228175
2023-07-20

Multi-trip wellbore completion system with a service string

 #14
20230160263
2023-05-25

Method and system for directional drilling

 #15
20230147453
2023-05-11

Flow splitting device for gas reverse circulation drilling

 #16
20230147209
2023-05-11

Drill head and method for producing a vertical borehole in the ground

 #17
20230063617
2023-03-02

TRAPDOOR-STYLE DRILLING MUD SCREEN SYSTEM AND METHODS THEREOF

 #18
20220412176
2022-12-29

IMPROVEMENT RELATING TO DRILL RODS

 #19
20220316277
2022-10-06

Projectile drilling system

 #20
20210340864
2021-11-04

Mud pulser and method for operating thereof

 #21
20210340827
2021-11-04

Jet pump drilling assembly

 #22
20210270098
2021-09-02

Valve style drilling mud screen system and methods thereof

 #23
20210246765
2021-08-12

Active alternator control in a downhole tool string

 #24
20210189814
2021-06-24

Drilling mud screen system and methods thereof

 #25
20210172317
2021-06-10

Method and apparatus for removing debris from a drill hole during drilling

 #26
20210156230
2021-05-27

SYSTEMS AND METHODS FOR MANAGING DEBRIS IN A WELL

 #27
20210087929
2021-03-25

Activation and control of downhole tools including a non-rotating power section option

 #28
20210087891
2021-03-25

Concentric pipe systems and methods

 #29
20210062590
2021-03-04

Drilling system with circulation sub

 #30
20210040817
2021-02-11

Well in a geological structure

 #31
20200399967
2020-12-24

Drilling mud screen system and methods thereof

 #32
20200392839
2020-12-17

Rotary steerable drilling system, a drill string sub therefor and a method of operating such system

 #33
20200370382
2020-11-26

Steam and inflow control for SAGD wells

 #34
20200347678
2020-11-05

Fluid operated drilling device and a method for drilling a hole using a fluid operated drilling device

 #35
20200325743
2020-10-15

Manifold for hydraulic fracturing blender and other applications

 #36
20200300049
2020-09-24

Wellbore cleanout tool

 #37
20200291754
2020-09-17

Hydrate solid-state fluidization mining method and system under underbalanced reverse circulation condition

 #38
20200240222
2020-07-30

Mud circulation system for reducing the swab pressure while tripping out

 #39
20200190930
2020-06-18

Well abandonment and slot recovery

 #40
20200141200
2020-05-07

Piston-style drilling mud screen system and methods thereof

 #41
20200141187
2020-05-07

Selective activation of motor in a downhole assembly

 #42
20200095857
2020-03-26

Subsea splitter pump system

 #43
20200087999
2020-03-19

Multi-cycle wellbore clean-out tool

 #44
20200072009
2020-03-05

Well abandonment and slot recovery

 #45
20200056433
2020-02-20

Iron roughnecks for non-stop circulation system

 #46
20200048973
2020-02-13

Single ball activated hydraulic circulating tool

 #47
20200003039
2020-01-02

Water jet mining system and method

 #48
20190368307
2019-12-05

Cementing casing in a large diameter mud drilled well

 #49
20190368272
2019-12-05

Pneumatic drilling with packer slideable along stem drill rod

 #50
20190352986
2019-11-21

System and method for transmitting signals downhole

 #51
20190277101
2019-09-12

PLUG AND PLAY CONNECTION SYSTEM FOR A BELOW-TENSION-RING MANAGED PRESSURE DRILLING SYSTEM

 #52
20190277095
2019-09-12

Concentric pipe systems and methods

 #53
20190234208
2019-08-01

System and method for surface management of drill-string rotation for whirl reduction

 #54
20190226289
2019-07-25

Degaussing ferrous material within drilling fluids

 #55
20190218882
2019-07-18

Shoe isolation system and method for isolating a shoe

 #56
20190153783
2019-05-23

Annular pressure reduction system for horizontal directional drilling

 #57
20190136652
2019-05-09

Universal drilling and completion system

 #58
20190120019
2019-04-25

Systems and methods for managing debris in a well

 #59
20190112884
2019-04-18

Piston-style drilling mud screen system and methods thereof

 #60
20190048675
2019-02-14

METHOD AND SYSTEM FOR WELLBORE DEBRIS REMOVAL

 #61
20180313178
2018-11-01

Drilling mud screen system and methods thereof

 #62
20180274312
2018-09-27

Lost circulation zone isolating liner

 #63
20180274299
2018-09-27

Multi fluid drilling system

 #64
20180230750
2018-08-16

Selective activation of motor in a downhole assembly

 #65
20180223613
2018-08-09

Drilling wells with air

 #66
20180163514
2018-06-14

Active alternator control in a downhole tool string

 #67
20180045003
2018-02-15

Hydraulic control of downhole tools

 #68
20180044991
2018-02-15

Dual circulation fluid hammer drilling system

 #69
20180016872
2018-01-18

Systems and methods for managing debris in a well

 #70
20180010406
2018-01-11

Single ball activated hydraulic circulating tool

 #71
20170306709
2017-10-26

Sub for accommodating large devices

 #72
20170254178
2017-09-07

Dual coiled tubing head

 #73
20170247959
2017-08-31

Apparatus and method for well operations

 #74
20170234096
2017-08-17

Inner drilling riser tie-back connector seal

 #75
20170175468
2017-06-22

Universal drilling and completion system

 #76
20170114600
2017-04-27

Well drilling apparatus and method of use

 #77
20170089199
2017-03-30

Water jet mining system and method

 #78
20170051577
2017-02-23

Systems and methods for managing debris in a well

 #79
20170002624
2017-01-05

Method and apparatus for managing annular fluid expansion and pressure within a wellbore

 #80
20170002616
2017-01-05

Connection device for connecting a secondary circuit to a drilling element for the circulation of drilling fluids in an oil well

 #81
20160230485
2016-08-11

Drill rod for percussion drill tool

 #82
20160201410
2016-07-14

Drilling apparatus and methods for reducing circulation loss

 #83
20160168916
2016-06-16

Apparatus for drilling deeper and wider well bore with casing

 #84
20160145975
2016-05-26

Downhole power generation system

 #85
20160123116
2016-05-05

Systems and methods for managing debris in a well

 #86
20160108686
2016-04-21

Dual circulation drilling system

 #87
20160053550
2016-02-25

Drill head

 #88
20160047187
2016-02-18

Wellbore drilling using dual drill string

 #89
20150361746
2015-12-17

Two phase mud flow usage with dual-string drilling system

 #90
20150337610
2015-11-26

Methods and systems for performance of subterranean operations using dual string pipes

 #91
20150330151
2015-11-19

Apparatus for drilling and lining a borehole

 #92
20150322721
2015-11-12

Casing drilling system and method

 #93
20150315863
2015-11-05

Universal drilling and completion system

 #94
20150285015
2015-10-08

Apparatus for continuous circulation drilling of a wellbore

 #95
20150252639
2015-09-10

Drilling and grouting method and apparatus

 #96
20150226463
2015-08-13

Multiplex pipe and system for recovering steam from geothermal wells

 #97
20150184478
2015-07-02

Diverter assemblies and systems for forming seals around pipe elements and methods of using same

 #98
20150184477
2015-07-02

Method and Device for a Running Tool

 #99
20150144360
2015-05-28

Drill element and associated equipment and methods

 #100
20150136492
2015-05-21

Dual circulation drilling system

 #101
20150107905
2015-04-23

HYDRAULIC BOREHOLE MINING SYSTEM AND METHOD

 #102
20150041213
2015-02-12

Gas injection while drilling

 #103
20140284111
2014-09-25

Horizontal directional drilling system

 #104
20140241803
2014-08-28

Apparatus and methods for forming and using subterranean salt cavern

 #105
20140182943
2014-07-03

Continuous flow drilling systems and methods

 #106
20140144706
2014-05-29

Rotating continuous flow sub

 #107
20140083776
2014-03-27

Method for initiating fluid circulation using dual drill pipe

 #108
20130299164
2013-11-14

Systems and methods for advanced well access to subterranean formations

 #109
20130284519
2013-10-31

Gravity based fluid trap

 #110
20130240267
2013-09-19

METHOD FOR CONTINUOUS FORMATION CORE SAMPLING

 #111
20130220623
2013-08-29

Actuator for dual drill string valve and rotary drill string valve configuration therefor

 #112
20130220622
2013-08-29

Actuator for dual drill string valve and drill string valve configurations therefore

 #113
20130206482
2013-08-15

Pump positioned at a drill bit

 #114
20130181438
2013-07-18

Structure for a nested dual drill pipe joint

 #115
20130133953
2013-05-30

REVERSE CIRCULATION DRILLING SYSTEM, APPARATUS AND METHOD

 #116
20130133893
2013-05-30

Debris removal system for downhole closure mechanism, and method thereof

 #117
20130087389
2013-04-11

Fluid partition unit

 #118
20130048377
2013-02-28

Underwater drilling arrangement and method for making a bore

 #119
20130043031
2013-02-21

Manifold string for selectivity controlling flowing fluid streams of varying velocities in wells from a single main bore

 #120
20130025865
2013-01-31

Wellbore knock-out chamber and related methods of use

 #121
20130008718
2013-01-10

CONTROL SYSTEM AND INTERFACE FOR A TUNNELING APPARATUS

 #122
20130008648
2013-01-10

Apparatus and method for well operations

 #123
20130008647
2013-01-10

Apparatus and Method for Well Operations

 #124
20120298369
2012-11-29

Differential pressure wellbore tool and related methods of use

 #125
20120292112
2012-11-22

Apparatus for drilling faster, deeper and wider well bore

 #126
20120292047
2012-11-22

Wellbore filter screen and related methods of use

 #127
20120241221
2012-09-27

Microtunnelling system and apparatus

 #128
20120234551
2012-09-20

System and method for drilling a well that extends for a large horizontal distance

 #129
20120205908
2012-08-16

Plug connection and pipe section for a drill pipe

 #130
20120199398
2012-08-09

Wellbore completion system with reaming tool

 #131
20120199362
2012-08-09

Methods of maintaining sufficient hydrostatic pressure in multiple intervals of a wellbore in a soft formation

 #132
20120138368
2012-06-07

Bottom preventer for use in a drilling system

 #133
20120125686
2012-05-24

Method and system for transferring signals through a drill pipe system

 #134
20120118644
2012-05-17

Method and device for drilling shafts in ground layers consisting of rock, clay and/or related materials

 #135
20120067643
2012-03-22

TWO-PHASE ISOLATION METHODS AND SYSTEMS FOR CONTROLLED DRILLING

 #136
20120061087
2012-03-15

Continuous flow drilling systems and methods

 #137
20110278069
2011-11-17

Method and apparatus for down-the-hole drilling

 #138
20110266062
2011-11-03

Latching configuration for a microtunneling apparatus

 #139
20110206459
2011-08-25

Apparatus and methods for forming and using subterranean salt cavern

 #140
20110192604
2011-08-11

Drilling, completing and stimulating a hydrocarbon production well

 #141
20110180269
2011-07-28

Down hole valve device

 #142
20110155379
2011-06-30

Rotating continuous flow sub

 #143
20110132603
2011-06-09

Offset interior slurry discharge

 #144
20110100635
2011-05-05

System for drilling under balanced wells

 #145
20100319995
2010-12-23

Self-circulating drill bit

 #146
20100319935
2010-12-23

METHOD AND DEVICE FOR A RUNNING TOOL

 #147
20100314174
2010-12-16

FLOW DIVERTER FOR DRILLING

 #148
20100314107
2010-12-16

Method and device for transferring signals within a well

 #149
20100276143
2010-11-04

Method and device for cleaning and sealing a well

 #150
20100263859
2010-10-21

Wellbore system

 #151
20100258353
2010-10-14

Air/water separator and methods of use thereof

 #152
20100224748
2010-09-09

Boat installation frame for transportation tanks

 #153
20100200302
2010-08-12

Digging tool, digging bit, and device

 #154
20100116501
2010-05-13

Backup safety flow control system for concentric drill string

 #155
20100006340
2010-01-14

Downhole reservoir effluent column pressure restraining apparatus and methods

 #156
20100006297
2010-01-14

PIPE STRING DEVICE FOR CONVEYING A FLUID FROM A WELL HEAD TO A VESSEL

 #157
20100000797
2010-01-07

DRILLING TOOL

 #158
20090301784
2009-12-10

Constricting flow diverter

 #159
20090301783
2009-12-10

Microtunnelling system and apparatus

 #160
20090294177
2009-12-03

Backup safety flow control system for concentric drill string

 #161
20090236144
2009-09-24

Managed pressure and/or temperature drilling system and method

 #162
20090205872
2009-08-20

Air injection collar

 #163
20090200085
2009-08-13

System for drilling under-balanced wells

 #164
20090173543
2009-07-09

Slim-hole parasite string

 #165
20090152012
2009-06-18

Cutting apparatus for a microtunnelling system

 #166
20090152010
2009-06-18

Drill head for a microtunnelling apparatus

 #167
20090152008
2009-06-18

Microtunnelling system and apparatus

 #168
20090126933
2009-05-21

Device and method for retrieving debris from a well

 #169
20090101413
2009-04-23

DTH-hammer drilling device and overburden drilling method

 #170
20090078466
2009-03-26

Apparatus and method for driving casing or conductor pipe

 #171
20090025930
2009-01-29

Continuous flow drilling systems and methods

 #172
20080289878
2008-11-27

Downhole blowout preventor

 #173
20080236809
2008-10-02

Drilling, completing and stimulating a hydrocarbon production well

 #174
20080196903
2008-08-21

Shoe for wellbore lining tubing

 #175
20080099195
2008-05-01

METHOD AND APPARATUS FOR ISOLATING AND TESTING ZONES DURING REVERSE CIRCULATION DRILLING

 #176
20080029307
2008-02-07

Rock drilling equipment

 #177
20070169943
2007-07-26

Method and device for establishing an underground well

 #178
20060225923
2006-10-12

Drilling assembly and method for drilling a barehole into geological formations

 #179
20060180351
2006-08-17

Air injection collar

 #180
20060131029
2006-06-22

Method and system for cleaning a well bore

 #181
20050224228
2005-10-13

Method and apparatus for isolating and testing zones during reverse circulation drilling

 #182
20050205261
2005-09-22

System and method for remediating pipeline blockage

 #183
20050199390
2005-09-15

Apparatus and methods for sealing voids in a subterranean formation

 #184
20050178586
2005-08-18

DOWNHOLE BLOWOUT PREVENTOR

 #185
20050178562
2005-08-18

METHOD AND APPARATUS FOR ISOLATING AND TESTING ZONES DURING REVERSE CIRCULATION DRILLING

 #186
20050006148
2005-01-13

Assembly for drilling low pressure formation

 #187
20050000731
2005-01-06

Method and apparatus for treating a productive zone while drilling

 #188
18505231
2025-03-04

Systems and methods for determining wear of downhole tools

 #189
18457081
2024-12-24

Pulsed power drilling with multiple selective drilling fluids

 #190
16130263
2019-04-30

Plug and play connection system for a below-tension-ring managed pressure drilling system

 #191
15671213
2018-07-03

Method and system for wellbore debris removal