ClassID:

135128

E21B4/00 - CPC Classification

Classification description:

Drives for drilling, used in the borehole

Sub-classes:
Recent Application in this class:
#1
20260078751
2026-03-19

GAS COMPRESSOR AND SYSTEM AND METHOD FOR GAS COMPRESSING

#2
20250369657
2025-12-04

METHOD AND SYSTEMS FOR HEAT RECOVERY FROM GEOTHERMALLY-HEATED FORMATIONS BY DIRECTED FLOW

#3
20250188800
2025-06-12

A DRILL HEAD FOR USE WITH MICROTUNNELING APPARATUS

#4
20250137492
2025-05-01

FORCE COUPLING ASSEMBLIES AND RELATED SYSTEMS AND METHODS

#5
20240418161
2024-12-19

GAS COMPRESSOR AND SYSTEM AND METHOD FOR GAS COMPRESSING

#6
20240418072
2024-12-19

Method for monitoring overburden when advance working in the ground, and advance- working device

#7
20240248235
2024-07-25

Machine learning proxy model for parameter tuning in oilfield production operations

#8
20230091081
2023-03-23

Drilling assembly for removal of an obstacle in a conduit

#9
20230052172
2023-02-16

Torque coupling assemblies and related systems and methods

#10
20220268273
2022-08-25

Gas compressor and system and method for gas compressing

#11
20220112785
2022-04-14

Steering system for use with a drill string

#12
20210317825
2021-10-14

Gas compressor and system and method for gas compressing

#13
20210131502
2021-05-06

Universal joint

#14
20210095527
2021-04-01

Sealing assembly and related methods

#15
20200199959
2020-06-25

Drilling speed increasing device driven by downhole motor for generating shock vibration

#16
20200157309
2020-05-21

OIL AND GAS RECOVERY ARTICLES

#17
20200141187
2020-05-07

Selective activation of motor in a downhole assembly

#18
20200124040
2020-04-23

Gas compressor and system and method for gas compressing

#19
20190331171
2019-10-31

RECIPROCATION-DAMPENING DRIVE SHAFT ASSEMBLY

#20
20190229569
2019-07-25

Systems and methods for constructing permanent magnet motors having increased power density

#21
20190136628
2019-05-09

Bearings for downhole drilling motors

#22
20190032652
2019-01-31

Gas compressor and system and method for gas compressing

#23
20180355710
2018-12-13

Near-bit measurement while drilling system

#24
20180347352
2018-12-06

Rotatable sensors for measuring characteristics of subterranean formation

#25
20180233869
2018-08-16

Hydroplaning reducing slip ring apparatus

#26
20180230750
2018-08-16

Selective activation of motor in a downhole assembly

#27
20180223656
2018-08-09

Near-bit ultradeep measurement system for geosteering and formation evaluation

#28
20180187490
2018-07-05

INITIATOR NANOCONSTITUENTS FOR ELASTOMER CROSSLINKING AND RELATED METHODS AND ARTICLES

#29
20180119520
2018-05-03

Actuation tool having a non-ballistic force generating mechanism

#30
20180058151
2018-03-01

Coupling mechanism for driveshaft transmission assembly

#31
20180038365
2018-02-08

Gas compressor and system and method for gas compressing

#32
20180030978
2018-02-01

Gas compressor and system and method for gas compressing

#33
20180016850
2018-01-18

Downhole Outer Drill Bit

#34
20170350240
2017-12-07

Synchronizing downhole communications using timing signals

#35
20170328451
2017-11-16

Down-Hole Roto-Linear Actuator

#36
20170328133
2017-11-16

Eliminating threaded lower mud motor housing connections

#37
20170292329
2017-10-12

SELF PROPELLING SUBTERRANEAN VEHICLE

#38
20170268325
2017-09-21

Estimating wellbore cement properties

#39
20170248013
2017-08-31

Near-bit ultradeep measurement system for geosteering and formation evaluation

#40
20170242153
2017-08-24

System for geosteering and formation evaluation utilizing near-bit sensors

#41
20170175466
2017-06-22

FORMING A SUBSEA WELLBORE

#42
20170145817
2017-05-25

Down-hole communication across a mud motor

#43
20170122045
2017-05-04

Wrench for breaking internal connections

#44
20160369629
2016-12-22

Center-pillared full-face shaft drilling machine

#45
20160326864
2016-11-10

Steerable drilling method and system

#46
20160326807
2016-11-10

Directional drilling while conveying a lining member, with latching parking capabilities for multiple trips

#47
20160319883
2016-11-03

CV joint for drilling motor and method

#48
20160312000
2016-10-27

OIL AND GAS RECOVERY ARTICLES

#49
20160298392
2016-10-13

Directional drilling system and methods

#50
20160294139
2016-10-06

Hydroplaning reducing slip ring apparatus

#51
20160290065
2016-10-06

Drill string with bottom hole assembly transition section having increasing external diameter and method of use

#52
20160290050
2016-10-06

Downhole drilling motor with an adjustment assembly

#53
20160265337
2016-09-15

Nanofiber strain gauge sensors in downhole tools

#54
20160265335
2016-09-15

Analyzing Toolface Velocity to Detect Detrimental Vibration During Drilling

#55
20160258288
2016-09-08

Rotatable sensors for measuring characteristics of subterranean formation

#56
20160122299
2016-05-05

Initiator nanoconstituents for elastomer crosslinking and related methods

#57
20160060982
2016-03-03

Dual device apparatus and methods usable in well drilling and other operations

#58
20160053540
2016-02-25

Drilling apparatus

#59
20160040525
2016-02-11

Bend measurements of adjustable motor assemblies using strain gauges

#60
20150363544
2015-12-17

Drill bit design

#61
20150354305
2015-12-10

Rotatable wireline tool of enhanced hydraulic drive consistency

#62
20150345223
2015-12-03

Method and system for directional drilling

#63
20150322737
2015-11-12

DRILLING DEVICE AND METHOD FOR PRODUCING A BORE

#64
20150322719
2015-11-12

High strength corrosion resistant high velocity oxy fuel (HVOF) coating for downhole tools

#65
20150275581
2015-10-01

Torque transfer mechanism for downhole drilling tools

#66
20150267474
2015-09-24

Method and system for transporting a hydrocarbon fluid

#67
20150252653
2015-09-10

SYSTEM TO ENABLE GEOTHERMAL FIELD INTERACTION WITH EXISTING HVAC SYSTEMS, METHOD TO ENABLE GEOTHERMAL FIELD INTERACTION WITH EXISTING HVAC SYSTEM

#68
20150252633
2015-09-10

Powered milling clamp for drill pipe

#69
20150136487
2015-05-21

Coring system including tensiometer and method of deciding accurate coring using the same

#70
20150083541
2015-03-26

Anti-stall mechanism

#71
20150048705
2015-02-19

Magnetic drive devices, and related systems and methods

#72
20150041219
2015-02-12

Housing, mandrel and bearing assembly positionable in a wellbore

#73
20150013995
2015-01-15

Methods and systems for operating a downhole tool

#74
20140353032
2014-12-04

Expandable apparatus and related methods

#75
20140338924
2014-11-20

Downhole activation system using magnets and method thereof

#76
20140305711
2014-10-16

Downhole drilling assembly

#77
20140305710
2014-10-16

Downhole drilling assembly

#78
20140262521
2014-09-18

Top drive main shaft with threaded load nut

#79
20140238746
2014-08-28

Actuation mechanisms for downhole assemblies and related downhole assemblies and methods

#80
20140196953
2014-07-17

Drilling apparatus

#81
20140116779
2014-05-01

Application of downhole rotary tractor

#82
20140110175
2014-04-24

Downhole activation system using magnets and method thereof

#83
20130233547
2013-09-12

Subsea casing drilling system

#84
20130233534
2013-09-12

Latch assembly

#85
20130181719
2013-07-18

Downhole activation system using magnets and method thereof

#86
20130092444
2013-04-18

Cutting tool integrated in a drillstring

#87
20130087386
2013-04-11

Expandable apparatus and related methods

#88
20120325561
2012-12-27

Housing, mandrel and bearing assembly for downhole drilling motor

#89
20120145394
2012-06-14

Rotatable wireline tool of enhanced hydraulic drive consistency

#90
20120111640
2012-05-10

Downhole drilling assembly

#91
20110308862
2011-12-22

Drilling system

#92
20110308861
2011-12-22

Expandable reamers for subterranean drilling and related methods

#93
20110297443
2011-12-08

Expandable reamer apparatus and related methods

#94
20110147083
2011-06-23

Analyzing toolface velocity to detect detrimental vibration during drilling

#95
20100288557
2010-11-18

Expandable reamer for subterranean boreholes and methods of use

#96
20100276199
2010-11-04

Expandable reamer apparatus

#97
20100224413
2010-09-09

Method of selecting a drilling motor for a casing drill string

#98
20080209904
2008-09-04

Systems and Methods for Generating Electricity Using a Stirling Engine

#99
20080127475
2008-06-05

Composite coating with nanoparticles for improved wear and lubricity in down hole tools

#100
20080110678
2008-05-15

Expandable reamer apparatus for enlarging boreholes while drilling

#101
20080105465
2008-05-08

Expandable reamer for subterranean boreholes and methods of use

#102
20080105464
2008-05-08

Moveable blades and bearing pads

#103
20080029303
2008-02-07

Technique and apparatus for drilling and completing a well in one half trip

#104
20070251729
2007-11-01

Downhole motor with a continuous conductive path

#105
20070114065
2007-05-24

Drill bit assembly

#106
20070114064
2007-05-24

Hydraulic drill bit assembly

#107
20070017708
2007-01-25

Expandable reamer apparatus for enlarging boreholes while drilling and methods of use

#108
20060124359
2006-06-15

Method of avoiding the need for a scraper run in drill out operations and a downhole drilling motor assembly

#109
20060011362
2006-01-19

Power transmission unit of an impactor, a hydraulic jet impactor and the application thereof

#110
20050173155
2005-08-11

Down hole motor with locking mechanism

#111
20050145417
2005-07-07

Expandable reamer apparatus for enlarging subterranean boreholes and methods of use

#112
14876777
2017-10-24

Motor rotary steerable system

#113
14806340
2016-10-11

Drill bit and cylinder body device, assemblies, systems and methods