ClassID:

135428

E21B27/02 - CPC Classification

Classification description:

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 Dump bailers, i.e. containers for depositing substances, e.g. cement or acids

Recent Application in this class:
#1
20260036010
2026-02-05

CEMENT DUMP BAILER WITH HOLLOW BRIDGE PLUG

#2
20250347185
2025-11-13

ACTIVELY CONTROLLED BAILER

#3
20250290379
2025-09-18

METHODS TO REMOVE ALLOY PLUGS AND ANNULAR SEALS AND ASSOCIATED APPARATUS

#4
20250146410
2025-05-08

HYBRID BAILER

#5
20250075577
2025-03-06

METHOD AND DEVICE FOR DOWNHOLE TREATING GAS WELLS

#6
20240159126
2024-05-16

Gas-actuated dump bailer

#7
20230407724
2023-12-21

Wellbore drilling and completion systems using laser head

#8
20230332476
2023-10-19

System and method for controlled downhole chemical release

#9
20230175342
2023-06-08

Introduction and mixing of separate liquid compositions containing reactive components within a well

#10
20230108571
2023-04-06

Methods and apparatus for deployment of large lost circulation material objects

#11
20230065388
2023-03-02

Dump bailer and lubricator assembly for filling the dump bailer

#12
20230013958
2023-01-19

Apparatus and method for injecting a fluid into the well during drilling

#13
20220412178
2022-12-29

Actively controlled bailer

#14
20220298893
2022-09-22

Downhole pumping tool

#15
20220235619
2022-07-28

Removing obstructions in a wellbore

#16
20220213753
2022-07-07

MAGNETICALLY CONTROLLED RELEASE OF CHEMICALS IN A DOWNHOLE ENVIRONMENT

#17
20220120179
2022-04-21

DISPENSING AND COLLECTION FLUIDS WITH WIRELINE CHAMBER TOOL

#18
20220106853
2022-04-07

Plug and abandonment system

#19
20220074278
2022-03-10

FRACKING SAND CONTAINER WITH DOUBLE DISCHARGE

#20
20220049565
2022-02-17

Acid wash system for wireline and slickline

#21
20220018211
2022-01-20

Heat sources and alloys for use in down-hole applications

#22
20220003068
2022-01-06

A-annulus cementing without pumping cement

#23
20210372217
2021-12-02

Piston burst disk dump bailer

#24
20210372216
2021-12-02

Flexible barrel dump bailer

#25
20210372215
2021-12-02

POSITIVE DISPLACEMENT DUMP BAILER

#26
20210332657
2021-10-28

Dump bailers

#27
20210324702
2021-10-21

Method and apparatus for identifying and remediating loss circulation zone

#28
20210310324
2021-10-07

A METHOD OF SUPPLYING INJECTION FLUID TO A SUBSEA FACILITY

#29
20210254421
2021-08-19

Downhole tool with an acid pill

#30
20210238941
2021-08-05

Downhole acid injection to stimulate formation production

#31
20210199003
2021-07-01

Method for extracting downhole flow profiles from tracer flowback transients

#32
20210180422
2021-06-17

Trojan drill pipe

#33
20210172283
2021-06-10

A DEVICE FOR FORMING A BARRIER IN AN ANNULUS OF A WELL

#34
20210095537
2021-04-01

Method and apparatus for a chemical capsule joint

#35
20210048149
2021-02-18

FILLING SYSTEM SUITABLE FOR SOLID DRAG REDUCING AGENT AND SOLID THICKENER

#36
20210040821
2021-02-11

In-situ system for mixing two or more chemical components downhole in a wellbore and a method employing same

#37
20210017827
2021-01-21

Targeted downhole delivery with container

#38
20200392824
2020-12-17

Hybrid photonic-pulsed fracturing tool and related methods

#39
20200370393
2020-11-26

Section milled window cementing diverter

#40
20200347686
2020-11-05

Downhole placement tool with fluid actuator and method of using same

#41
20200270986
2020-08-27

Method for extracting downhole flow profiles from tracer flowback transients

#42
20200270985
2020-08-27

Method for extracting downhole flow profiles from tracer flowback transients

#43
20200115980
2020-04-16

Method and apparatus for a chemical capsule joint

#44
20200048974
2020-02-13

Fluid release mechanism for a chemically-inflatable bag

#45
20200011156
2020-01-09

Method and apparatus for stuck pipe mitigation

#46
20190316449
2019-10-17

Perforating systems and flow control for use with well completions

#47
20190316443
2019-10-17

System and method for cleaning a production tubing

#48
20190292866
2019-09-26

Method to manipulate a well using an overbalanced pressure container

#49
20190195064
2019-06-27

Method for extracting downhole flow profiles from tracer flowback transients

#50
20190178051
2019-06-13

System and method for delivering a flowable substance and borehole sealing

#51
20190169954
2019-06-06

Light and buoyant retrievable assembly—wellbore tool and method

#52
20190162051
2019-05-30

In-situ system for mixing two or more chemical components downhole in a wellbore and a method employing same

#53
20190153860
2019-05-23

Acquiring formation fluid samples using micro-fracturing

#54
20190128091
2019-05-02

Apparatus for use in well abandonment

#55
20190128081
2019-05-02

Apparatus and method to expel fluid

#56
20190128080
2019-05-02

APPARATUS AND METHOD FOR PUMPING FLUID IN A BOREHOLE

#57
20190100973
2019-04-04

Tracer injections

#58
20190055806
2019-02-21

Heat sources and alloys for use in down-hole applications

#59
20180328149
2018-11-15

Actuator with port

#60
20180178960
2018-06-28

Water-degradable carrier for caustic substances and related manufacturing method

#61
20180119512
2018-05-03

Outflow control device for creating a packer

#62
20180038223
2018-02-08

Petroleum well tracer release flow shunt chamber

#63
20170335651
2017-11-23

Plugging device deployment in subterranean wells

#64
20170306714
2017-10-26

Wireline operated dump bailer and method for unloading of material in a well

#65
20170292344
2017-10-12

Methods of completing a well and apparatus therefor

#66
20170247966
2017-08-31

Damaged seal bore repair device

#67
20170175472
2017-06-22

Select fire system and method of using same

#68
20170175471
2017-06-22

Dump bailer actuator

#69
20170114636
2017-04-27

Dual function downhole tool

#70
20170089176
2017-03-30

Grout delivery

#71
20160348467
2016-12-01

Plugging device deployment in subterranean wells

#72
20160348454
2016-12-01

Bore hole tracer injection apparatus

#73
20160326832
2016-11-10

Systems and methods for fluid communication with an earth formation through cement

#74
20160312583
2016-10-27

Hydrate plug remover

#75
20160251935
2016-09-01

Delivering an agent into a well using an untethered object

#76
20160222779
2016-08-04

System and a method for determining inflow distribution in an openhole completed well

#77
20160201454
2016-07-14

Petroleum well tracer release flow shunt chamber

#78
20160145962
2016-05-26

Apparatus for use in well abandonment

#79
20160090828
2016-03-31

Systems and methods for releasing methane from clathrates

#80
20160010454
2016-01-14

Tracer based flow measurement

#81
20150368542
2015-12-24

System and method of using heat sources and alloys in down-hole applications

#82
20150345248
2015-12-03

Apparatus for use in well abandonment

#83
20150308219
2015-10-29

Apparatus and method for positioning of a fluidized plugging material in an oil well or gas well

#84
20150292288
2015-10-15

Wellbore bailer

#85
20150204165
2015-07-23

APPARATUS AND METHOD FOR CONTINUOUSLY MIXING FLUIDS USING DRY ADDITIVES

#86
20150152318
2015-06-04

FRACTURING PROCESS USING LIQUID AMMONIA

#87
20150114626
2015-04-30

Object Launching System for Well

#88
20150101806
2015-04-16

Method for providing step changes in proppant delivery

#89
20150090453
2015-04-02

Systems and methods for secondary sealing of a perforation within a wellbore casing

#90
20150090442
2015-04-02

Chemical based well kickoff system for naturally flowing wells

#91
20150090438
2015-04-02

Stacked tray ball dropper for subterranean fracking operations

#92
20150075869
2015-03-19

CONTINUOUS GRAVITY FEED SYSTEM FOR FEEDING ADDITIVES TO A DRILLING MUD SYSTEM

#93
20150075796
2015-03-19

Wellsite handling system for packaged wellsite materials and method of using same

#94
20140345103
2014-11-27

Method and device for removal of a hydrate plug

#95
20140326465
2014-11-06

Hybrid dump bailer and method of use

#96
20140318782
2014-10-30

Positive displacement dump bailer and method of operation

#97
20140299756
2014-10-09

System and method for providing a replenishable receptacle for tagger and/or tracer material in a wellbore

#98
20140262299
2014-09-18

Equalized hydrostatic bailer

#99
20140193101
2014-07-10

Remotely openable containment system and installation method

#100
20140174720
2014-06-26

Dump bailer

#101
20140158358
2014-06-12

Methods and systems of down-hole reagent processing and deployment

#102
20140116298
2014-05-01

Radiation-induced triggering for set-on-command sealant compositions

#103
20140041873
2014-02-13

Method and apparatus for local supply of a treatment fluid to a well portion

#104
20130268198
2013-10-10

Method for using tracer flowback for estimating influx volumes of fluids from different influx zones

#105
20130248174
2013-09-26

Autonomous downhole conveyance system

#106
20130245948
2013-09-19

Method for extracting downhole flow profiles from tracer flowback transients

#107
20130000891
2013-01-03

Radiation-induced triggering for set-on-command compositions and methods of use

#108
20120247777
2012-10-04

METHODS FOR SUPPLYING A CHEMICAL WITHIN A SUBTERRANEAN FORMATION

#109
20120247772
2012-10-04

Method of isolating and completing multiple zones within a wellbore

#110
20120247755
2012-10-04

Dump bailer

#111
20120160483
2012-06-28

Hybrid dump bailer and method of use

#112
20120090835
2012-04-19

DOWNHOLE MATERIAL-DELIVERY SYSTEM FOR SUBTERRANEAN WELLS

#113
20120085540
2012-04-12

Method and an apparatus for downhole injecting one or more treatment fluids

#114
20120085539
2012-04-12

Well tool and method for in situ introduction of a treatment fluid into an annulus in a well

#115
20120061072
2012-03-15

Methods and apparatuses for releasing a chemical into a well bore upon command

#116
20120024546
2012-02-02

Apparatus and method for autofill equipment activation

#117
20120006544
2012-01-12

Apparatus for depositing a slurry in a well

#118
20110303421
2011-12-15

Apparatus and method for sealing portions of a wellbore

#119
20110272141
2011-11-10

Radiation-induced triggering for set-on-command sealant compositions and methods of use

#120
20110253373
2011-10-20

TRANSPORT AND ANALYSIS DEVICE FOR USE IN A BOREHOLE

#121
20110162851
2011-07-07

Tool for shutting off openings or leaks in a well bore

#122
20110162841
2011-07-07

Continuous Slow Dissolving Chemical Treatment for Oil and Gas Wells

#123
20110155390
2011-06-30

Apparatus and method for pumping a fluid and an additive from a downhole location into a formation or to another location

#124
20110132599
2011-06-09

Apparatus for isolating and completing multi-zone frac packs

#125
20110100634
2011-05-05

Downhole chemical delivery system and method

#126
20110094754
2011-04-28

WELLBORE TREATMENT APPARATUS AND METHOD

#127
20110067873
2011-03-24

Use of foam shape memory polymer to transport acid or other wellbore treatments

#128
20110048713
2011-03-03

Radiation-induced triggering for set-on-command compositions and methods of use

#129
20110048711
2011-03-03

Methods of sonically activating cement compositions

#130
20110042082
2011-02-24

Methods and apparatuses for releasing a chemical into a well bore upon command

#131
20110042081
2011-02-24

Methods and apparatuses for releasing a chemical into a well bore upon command

#132
20100206558
2010-08-19

Apparatus and method for instantaneously injecting tracer for groundwater well

#133
20100186949
2010-07-29

Assembly for Controlled Delivery of Downhole Treatment Fluid

#134
20100155054
2010-06-24

DUMP BAILER

#135
20100122814
2010-05-20

Apparatus and method for depositing a slurry in a well

#136
20100051275
2010-03-04

Methods of activating compositions in subterranean zones

#137
20100050905
2010-03-04

Activating compositions in subterranean zones

#138
20090294133
2009-12-03

Injection Apparatus and Method

#139
20090266546
2009-10-29

Apparatus and method for discharging multiple fluids downhole

#140
20090229813
2009-09-17

System for injecting a substance into an annular space

#141
20090200028
2009-08-13

Wellbore delivery apparatus

#142
20090173500
2009-07-09

Method and apparatus for well treatment

#143
20090090507
2009-04-09

Wellbore and reservoir treatment device and method

#144
20090090506
2009-04-09

Downhole release of friction reducers in gravel packing operations

#145
20090038788
2009-02-12

Chemical delivery system for plunger lift

#146
20090032256
2009-02-05

Throttle unit for dump bailer and method of blocking a water out zone in a production well utilizing the same

#147
20080217058
2008-09-11

Heating device for passage through subterranean asphalt and method of use

#148
20080207469
2008-08-28

Bit balling treatment

#149
20080149346
2008-06-26

Method of Installing an Expandable Tubular in a Wellbore

#150
20080093077
2008-04-24

Injection apparatus for injecting an activated fluid into a well-bore and related injection method

#151
20070209797
2007-09-13

System for injecting a substance into an annular space

#152
20070039739
2007-02-22

Well chemical treatment utilizing plunger lift delivery system with chemically improved plunger seal

#153
20060213662
2006-09-28

Methods of delivering material downhole

#154
20060102336
2006-05-18

Primary electro-mechanical initiating dump bailer device and method of use

#155
20060048935
2006-03-09

Casing with isolated annular space

#156
20050109500
2005-05-26

Well downhole liquid dispenser

#157
20050022994
2005-02-03

Well chemical treatment utilizing plunger lift delivery system

#158
20050000687
2005-01-06

Device for performing a downhole operation

#159
18792370
2026-01-20

Cement dump bailer with hollow bridge plug

#160
14580061
2015-06-09

Dual modality container for storing and transporting frac sand and frac liquid