ClassID:

135574

E21B41/02 - page 2 - CPC Classification

Classification description:

Equipment or details not covered by groups  -  inhibition of corrosion in boreholes or wells

Recent Application in this class:
#301
20140263095
2014-09-18

CHEMICAL STRAINER

#302
20140262987
2014-09-18

Sub-sea chemical injection metering valve

#303
20140262260
2014-09-18

Sand control screen having improved reliability

#304
20140238677
2014-08-28

Chitin nanocrystal containing wellbore fluids

#305
20140206582
2014-07-24

Completion fluid for reducing friction between metal surfaces

#306
20140202709
2014-07-24

Method of completing a well using a friction reducing completion fluid

#307
20140202703
2014-07-24

Method of reducing corrosion on metal surfaces

#308
20140190692
2014-07-10

PRODUCTION-TREATING CHEMICALS ADDED TO POLYMER SLURRIES USED IN TREATMENT OF OIL AND GAS WELLS

#309
20140182855
2014-07-03

Injection device

#310
20140166282
2014-06-19

Functionalized hydrogen sulfide scavengers

#311
20140158876
2014-06-12

Methods for analyzing substances containing one or more organosulfur compounds using an integrated computational element

#312
20140148367
2014-05-29

NANOPARTICLE BIOCIDE IN INDUSTRIAL APPLICATIONS

#313
20140119984
2014-05-01

WITHANOLIDE CORROSION INHIBITOR FOR CARBON STEEL

#314
20140049399
2014-02-20

Power supply and voltage multiplication for submerged subsea systems based on cathodic protection system

#315
20140041874
2014-02-13

Wellbore Servicing System and Methods of Use

#316
20140041869
2014-02-13

Method and system for servicing a wellbore

#317
20130306318
2013-11-21

Erosion reduction in subterranean wells

#318
20130248169
2013-09-26

Environmentally powered transmitter for location identification of wellbores

#319
20130233544
2013-09-12

System and process for inhibitor injection

#320
20130233543
2013-09-12

Nitrogen containing compounds as corrosion inhibitors

#321
20130186631
2013-07-25

System and method for treatment of well completion equipment

#322
20130186617
2013-07-25

Corrosion management systems for vertically oriented structures

#323
20130153044
2013-06-20

Apparatus for flow regulation

#324
20130146302
2013-06-13

Controlled electrolytic degredation of downhole tools

#325
20130142977
2013-06-06

Releasable corrosion inhibitors

#326
20130112418
2013-05-09

Composition and Methods for Protecting Metal Surfaces from Corrosion

#327
20130112417
2013-05-09

Compositions and Methods for Protecting Metal Surfaces from Corrosion

#328
20130112416
2013-05-09

Compositions and Methods for Protecting Metal Surfaces from Corrosion

#329
20130112415
2013-05-09

Compositions and Methods for Protecting Metal Surfaces from Corrosion

#330
20130087328
2013-04-11

Downhole species selective optical fiber sensor systems and methods

#331
20130048303
2013-02-28

Chemical injection system

#332
20130032411
2013-02-07

Methods of forming coatings upon wellbore tools

#333
20120325488
2012-12-27

Chemical-injection management system

#334
20120295822
2012-11-22

System and process for inhibitor injection

#335
20120247778
2012-10-04

Completion fluid with friction reduction

#336
20120244228
2012-09-27

Chlorine dioxide precursor and methods of using same

#337
20120234692
2012-09-20

REPLACEABLE CP ANODES

#338
20120217012
2012-08-30

METHOD OF INTRODUCING TREATMENT AGENTS INTO A WELL OR FLOW CONDUIT

#339
20120199357
2012-08-09

Method of corrosion mitigation using nanoparticle additives

#340
20120181017
2012-07-19

Expandable device for use in a well bore

#341
20120136577
2012-05-31

SYSTEMS AND METHODS FOR MONITORING CORROSION IN A WELL

#342
20120125599
2012-05-24

Artificial simultaneous production and maintenance system assisted by mechanical pumping with flexible tubing for fluid extraction

#343
20120103422
2012-05-03

Water removal from anti-agglomerate LDHIs

#344
20120091396
2012-04-19

Releasable corrosion inhibitors

#345
20120090686
2012-04-19

Deadleg

#346
20120024906
2012-02-02

SYSTEM AND PROCESS FOR PRODUCTION OF POLYETHYLENE AND POLYPROPYLENE

#347
20120006542
2012-01-12

Method for pre-treatment of subterranean sites adjacent to water injection wells

#348
20120006541
2012-01-12

METHOD FOR PRE-TREATMENT OF SUBTERRANEAN SITES ADJACENT TO WATER INJECTION WELLS

#349
20110315444
2011-12-29

Apparatus and methods for corrosion protection of downhole tools

#350
20110297392
2011-12-08

Sub-sea chemical injection metering valve

#351
20110287985
2011-11-24

Methods and systems for treating subterranean wells

#352
20110278024
2011-11-17

Prevention or mitigation of steel corrosion caused by combustion gas

#353
20110272136
2011-11-10

Corrosion management systems for vertically oriented structures

#354
20110214855
2011-09-08

Expandable device for use in a well bore

#355
20110159217
2011-06-30

Method and system for reducing heat loss from subsea structures

#356
20110146992
2011-06-23

Controllable Chemical Injection For Multiple Zone Completions

#357
20110146831
2011-06-23

Method of fabrication of corrosion resistant oil field tubulars

#358
20110067876
2011-03-24

Method and apparatus for injecting fluid in a wellbore

#359
20100230366
2010-09-16

SEAWATER TREATMENT METHOD FOR THE PRODUCTION OF INJECTION WATER FOR UNDERSEA OIL DRILLING AND CORRESPONDING INSTALLATION

#360
20100186968
2010-07-29

Method and apparatus for continuously injecting fluid in a wellbore while maintaining safety valve operation

#361
20100186958
2010-07-29

Treating liquids in oil extraction

#362
20100108320
2010-05-06

Subsurface safety valve and method for chemical injection into a wellbore

#363
20100043897
2010-02-25

Chemical-injection management system

#364
20090229834
2009-09-17

System and method for selectively communicatable hydraulic nipples

#365
20090200013
2009-08-13

WELL TUBULAR, COATING SYSTEM AND METHOD FOR OILFIELD APPLICATIONS

#366
20090188666
2009-07-30

Method And System For Completing A Well

#367
20090188665
2009-07-30

Monitoring of downhole parameters and tools utilizing fiber optics

#368
20090114391
2009-05-07

Method for autonomous control of a chemical injection system for oil and gas wells

#369
20090078585
2009-03-26

Using an impressed current cathodic protection system to power electrical appliances

#370
20090001188
2009-01-01

System and process for inhibitor injection

#371
20080308270
2008-12-18

Method for utilizing pressure variations as an energy source

#372
20080271893
2008-11-06

Method and apparatus for continuously injecting fluid in a wellbore while maintaining safety valve operation

#373
20080236842
2008-10-02

DOWNHOLE OILFIELD APPARATUS COMPRISING A DIAMOND-LIKE CARBON COATING AND METHODS OF USE

#374
20080135296
2008-06-12

PROTECTIVE COATINGS FOR DRILL PIPE AND ASSOCIATED METHODS

#375
20080126383
2008-05-29

System and method for predicting compatibility of fluids with metals

#376
20080099199
2008-05-01

Automatic chemical treatment system with integral flush fluid dispenser and method for using the same

#377
20070254816
2007-11-01

Method for controlled placement of chemicals and composition useful for practicing same

#378
20070114024
2007-05-24

Anti-oxidizing process for non-cryogenic nitrogen

#379
20060272809
2006-12-07

Wellbores utilizing fiber optic-based sensors and operating devices

#380
20060207759
2006-09-21

Protection scheme and method for deployment of artificial lift devices in a wellbore

#381
20060144595
2006-07-06

Remote delivery of latex drag-reducing agent without introduction of immiscible low-viscosity flow facilitator

#382
20060108110
2006-05-25

Coated tools for use in oil well pipes

#383
20060102355
2006-05-18

Automatic chemical treatment system with integral flush fluid dispenser

#384
20060076526
2006-04-13

Anodic Protective Seal in a Blowout Preventer

#385
20060037745
2006-02-23

Expandable device for use in a well bore

#386
20060021750
2006-02-02

Method and system for injecting a treatment fluid into a well

#387
20050178673
2005-08-18

Axial current meter for in-situ continuous monitoring of corrosion and cathodic protection current

#388
20050166961
2005-08-04

Closed loop additive injection and monitoring system for oilfield operations

#389
20050156137
2005-07-21

Nitrogen-containing compounds as corrosion inhibitors

#390
20050012036
2005-01-20

Providing a light cell in a wellbore

#391
19258959
2025-12-16

Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking

#392
19201397
2026-05-05

Methods for preventing corrosion in flexible pipe with passivating agents

#393
19170589
2025-11-18

Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking

#394
19073674
2025-10-14

Wellbore and geologic formation desulfurization process

#395
18966737
2025-08-26

Method for treating a well bore to remove hydrogen sulfide

#396
18815558
2025-08-19

Well rehabilitation method

#397
18809440
2025-04-15

Process and material for removing hydrogen sulfide from subterranean geological formations during drilling operations

#398
18792758
2025-01-14

Process for removing hydrogen sulfide from subterranean geological formations with a layered triple hydroxide material in a water-based drilling fluid

#399
18742658
2025-08-05

Particulate buffer for attenuating corrosion of dissolvable frac plug

#400
18197385
2024-07-16

Removable covers for magnetic scale inhibitors

#401
16047983
2019-08-06

Artificial lift

#402
16047981
2019-05-07

Artificial lift

#403
16047937
2019-04-09

Artificial lift