E21B4/06 - CPC Classification Index

Ground drilling device, method for making a ground drilling device, method for maintaining a ground drilling device, and use of a ground drilling device

20200149354

2020-05-14

Drill bit repair type prediction using machine learning

20190145179

2019-05-16

Methods of forming stationary elements of rotatable cutting elements for use on earth-boring tools and stationary elements formed using such methods

20180283101

2018-10-04

HAMMER DRILL

#10

20180112470

2018-04-26

Locking bit retention system

#11

20180073327

2018-03-15

Hydraulic pulse valve with improved wear life and performance

#12

20180030797

2018-02-01

Downhole stroking tool

#13

20180016850

2018-01-18

Downhole Outer Drill Bit

#14

20170334052

2017-11-23

Percussion drilling device

#15

20170306699

2017-10-26

Downhole motor, drill string provided with such a motor and method of releasing a stuck drill bit attached to such a motor

#16

20170292335

2017-10-12

Device for clamping an element, carriage for a ground drilling device, ground drilling device, method for clamping an element and method for the manufacture of a device for clamping an element

#17

20170226806

2017-08-10

Downhole vibration for improved subterranean drilling

#18

20170051560

2017-02-23

Rotary percussive device

#19

20170030158

2017-02-02

System and method for providing oscillation downhole

#20

20160333644

2016-11-17

Hammering and rotatable drill bit

#21

20160318166

2016-11-03

Impact-driven tool

#22

20160108674

2016-04-21

Hammer drill

#23

20160069135

2016-03-10

Ram boring device

#24

20160069134

2016-03-10

Device and system for percussion rock drilling

#25

20160003372

2016-01-07

Control valve

#26

20150369039

2015-12-24

Bridge type concentric direct reading testing and commissioning instrument

#27

20150159436

2015-06-11

GROUND HOLE FORMING DEVICE

#28

20150152685

2015-06-04

Drilling apparatus and method

#29

20150132604

2015-05-14

Multilayered Coating for Downhole Tools with Enhanced Wear Resistance and Acidic Corrosion Resistance

#30

20150129308

2015-05-14

Coating of the piston for a rotating percussion system in downhole drilling

#31

20150083541

2015-03-26

Anti-stall mechanism

#32

20140151127

2014-06-05

CONTROL MECHANISM

#33

20140150576

2014-06-05

Vibrational tool with rotating engagement surfaces and method

#34

20140144705

2014-05-29

Hydraulic percussion apparatus and method of use

#35

20140069723

2014-03-13

METHOD AND APPARATUS FOR PENETRATING PARTICULATE SUBSTRATES

#36

20140041943

2014-02-13

Drilling motor valve and method of using same

#37

20130292182

2013-11-07

DOWN-THE-HOLE HAMMER DRILL ASSEMBLY

#38

20130220656

2013-08-29

Direct drill bit drive for tools on the basis of a heat engine

#39

20130186619

2013-07-25

Method and apparatus of distributed systems for extending reach in oilfield applications

#40

20130098689

2013-04-25

TWO-PART DRILLING TOOL FOR THE PERCUSSIVE OR ROTARY PERCUSSIVE DRILLING OF HOLES IN SOIL MATERIAL OR ROCK MATERIAL

#41

20130043075

2013-02-21

Drilling apparatus and method

#42

20130008722

2013-01-10

Down-hole hammer drill

#43

20120228031

2012-09-13

Ram boring device

#44

20110240377

2011-10-06

Drill Bit Jack Element with a Plurality of Inserts

#45

20110240373

2011-10-06

Down-the-hole drill hammer having an extendable drill bit assembly

#46

20110240369

2011-10-06

Downhole Steerable Hammer Element

#47

20110232970

2011-09-29

COILED TUBING PERCUSSION DRILLING

#48

20110155471

2011-06-30

Drive pin support

#49

20110120725

2011-05-26

Wellbore instruments using magnetic motion converters

#50

20110067928

2011-03-24

Bottom-hole assembly, and a method and system for transmitting data from a bottom-hole assembly

#51

20110061936

2011-03-17

Methods and apparatus for drilling directional wells by percussion method

#52

20100300752

2010-12-02

Method and apparatus for penetrating particulate substrates

#53

20100252330

2010-10-07

Down-hole hammer drill

#54

20090200082

2009-08-13

Methods and apparatus for drilling directional wells by percussion method

#55

20080099245

2008-05-01

Cam assembly in a downhole component

#56

20070221417

2007-09-27

Jack element in communication with an electric motor and or generator

#57

20070221408

2007-09-27

Drilling at a resonant frequency

#58

20060006001

2006-01-12

Percussive reamer and method of use thereof

#59

20050126822

2005-06-16

Drilling systems

#60

20050006105

2005-01-13

Method and apparatus for through rotary sub-sea pile-driving

#61

17199837

2024-07-02

Direct drive connector sleeve

#62

14709429

2015-08-18

Repetitive charge seismology unit