ClassID:

135375

E21B21/003 - page 3 - CPC Classification

Classification description:

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor Means for stopping loss of drilling fluid

Recent Application in this class:
#601
20160289530
2016-10-06

Drilling fluids with leakoff control and drill cuttings removal sweeps

#602
20160289528
2016-10-06

PROTEIN-BASED FIBROUS BRIDGING MATERIAL AND PROCESS AND SYSTEM FOR TREATING A WELLBORE

#603
20160282234
2016-09-29

Methods relating to designing wellbore strengthening fluids

#604
20160272878
2016-09-22

Treatment of siliceous materials using catechol and amines in subterranean applications

#605
20160257869
2016-09-08

Fiber suspending agent for lost-circulation materials

#606
20160237778
2016-08-18

Permeable lost circulation drilling liner

#607
20160237767
2016-08-18

SOLIDS IN BOREHOLD FLUIDS

#608
20160230074
2016-08-11

METHODS OF ZONAL ISOLATION AND TREATMENT DIVERSION

#609
20160230073
2016-08-11

Dual function internal breaker for crosslinked hydroxyethylcellulose

#610
20160230064
2016-08-11

Surface treated lost circulation material

#611
20160222279
2016-08-04

CORROSION INHIBITOR INTENSIFIERS FOR CORROSION RESISTANT ALLOYS

#612
20160222275
2016-08-04

Wellbore fluid additives of fibrillated fibers and methods of use

#613
20160222274
2016-08-04

ADDITIVES FOR CONTROLLING LOST CIRCULATION AND METHODS OF MAKING AND USING SAME

#614
20160215593
2016-07-28

Engineered LCM design to manage subterranean formation stresses for arresting drilling fluid losses

#615
20160215202
2016-07-28

Sequential surfactant treatments for enhancing fracturing fluid recovery

#616
20160214901
2016-07-28

Cement compatible water-based drilling mud compositions

#617
20160208567
2016-07-21

Methods For Servicing Subterranean Wells

#618
20160201411
2016-07-14

Composition for borehole treatment

#619
20160201410
2016-07-14

Drilling apparatus and methods for reducing circulation loss

#620
20160177163
2016-06-23

Organic-inorganic hybrid polymer based fluids

#621
20160160106
2016-06-09

Wellbore treatment fluids containing nano-carbohydrate based sheets and methods of using the same

#622
20160137903
2016-05-19

Lost circulation material

#623
20160122613
2016-05-05

Drilling fluid composition including viscosifier and method of using the same

#624
20160115759
2016-04-28

Changeable well seal tool

#625
20160108697
2016-04-21

Mixing and injecting fiber-based stimulation fluids

#626
20160108303
2016-04-21

Viscoelastic surfactants in mixed brines

#627
20160102237
2016-04-14

WELLBORE SERVICING COMPOSITIONS AND METHODS OF MAKING AND USING SAME

#628
20160096988
2016-04-07

Methods for Servicing Subterranean Wells

#629
20160084022
2016-03-24

Solids in borehole fluids

#630
20160068735
2016-03-10

Compositions and methods for fiber-containing grout

#631
20160061701
2016-03-03

Method and apparatus for testing gel-based lost circulation materials

#632
20160060985
2016-03-03

Methods for Servicing Subterranean Wells

#633
20160060501
2016-03-03

Methods for Controlling Lost Circulation in A Subterranean Well and Materials Therefor

#634
20160046852
2016-02-18

Polymer-based drilling fluids containing non-biodegradable particulates and methods for use thereof

#635
20160024863
2016-01-28

Preventing fluid loss

#636
20160024370
2016-01-28

Zero-invasion acidic drilling fluid

#637
20150376491
2015-12-31

LOST CIRCULATION COMPOSITION FOR FRACTURE SEALING

#638
20150361322
2015-12-17

Method for Enhancing Fiber Bridging

#639
20150344766
2015-12-03

Enhanced wellbore strengthening solution

#640
20150344764
2015-12-03

Viscous settable fluid for lost circulation in subterranean formations

#641
20150315453
2015-11-05

HIGH TEMPERATURE AND HIGH PRESSURE FLUID LOSS ADDITIVES AND METHODS OF USE THEREOF

#642
20150308209
2015-10-29

System and method for managed pressure wellbore strengthening

#643
20150292323
2015-10-15

System and method for integrated wellbore stress, stability and strengthening analyses

#644
20150292279
2015-10-15

Method of Stopping Lost Circulation

#645
20150292278
2015-10-15

Method of Stopping Lost Circulation

#646
20150275607
2015-10-01

Method of treating subterranean formation using shrinkable fibers

#647
20150252638
2015-09-10

Fluid loss well treatment

#648
20150240609
2015-08-27

MAGNETIC POLYMERS FOR IMPROVING HYDROCARBON RECOVERY OR DRILLING PERFORMANCE

#649
20150226029
2015-08-13

GROUT DELIVERY

#650
20150204161
2015-07-23

Method of improving cleanout of a wellbore

#651
20150198008
2015-07-16

Well system cementing plug

#652
20150197686
2015-07-16

Treatment fluids comprising viscosifying agents and methods of using the same

#653
20150184478
2015-07-02

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

#654
20150176373
2015-06-25

Inflow control device having elongated slots for bridging off during fluid loss control

#655
20150167424
2015-06-18

Deformable plug and seal well system

#656
20150166870
2015-06-18

Methods for Completing Subterranean Wells

#657
20150166869
2015-06-18

Enhanced acid soluble wellbore strengthening solution

#658
20150159076
2015-06-11

Acid soluble defluidizing pills

#659
20150136402
2015-05-21

Modified hydrocarbon resins as fluid loss additives

#660
20150126415
2015-05-07

Drilling fluids with nano and granular particles and their use for wellbore strengthening

#661
20150114646
2015-04-30

Triggered heating of wellbore fluids by carbon nanomaterials

#662
20150101805
2015-04-16

Viscoelastic surfactant based wellbore fluids and methods of use

#663
20150083423
2015-03-26

Method for improving isolation of flow to completed perforated intervals

#664
20150075792
2015-03-19

Method of cementing a well using delayed hydratable polymeric viscosifying agents

#665
20150060146
2015-03-05

RESERVOIR ACTIVATED EMULSION BREAKING FOR LOST CIRCULATION

#666
20150027707
2015-01-29

Engineered methods and materials for wellbore strengthening in subterranean operations

#667
20150021098
2015-01-22

BREAKER FLUIDS FOR WELLBORE FLUIDS AND METHODS OF USE

#668
20150008044
2015-01-08

Lost circulation drilling fluids comprising elastomeric rubber particles and a method for decreasing whole mud loss using such composition

#669
20140353043
2014-12-04

Method of conversion of a drilling mud to a gel-based lost circulation material to combat lost circulation during continuous drilling

#670
20140326511
2014-11-06

ENHANCED SMEAR EFFECT FRACTURE PLUGGING PROCESS FOR DRILLING SYSTEMS

#671
20140303049
2014-10-09

Process for treating an underground formation

#672
20140290945
2014-10-02

Methods of zonal isolation and treatment diversion

#673
20140262315
2014-09-18

Drilling mud recovery system

#674
20140262283
2014-09-18

Methods for treatment of a subterranean formation

#675
20140262281
2014-09-18

Methods of designing a drilling fluid having suspendable loss circulation material

#676
20140238674
2014-08-28

Clean fluid loss control additives

#677
20140231086
2014-08-21

Methods and compositions for treating subterranean formations with swellable lost circulation materials

#678
20140231082
2014-08-21

Methods and compositions for treating subterranean formations with interlocking lost circulation materials

#679
20140216743
2014-08-07

Shape-change particle plug system

#680
20140158354
2014-06-12

Viscous settable fluid for lost circulation in subterranean formations

#681
20140135237
2014-05-15

Expandable coating for solid particles and associated methods of use in subterranean treatments

#682
20140116691
2014-05-01

Chemical treatment method and additive used to treat fines migration and flow through porous media

#683
20140110115
2014-04-24

Gelling Agents and Methods of Using the Same

#684
20140090895
2014-04-03

Compositions and methods for reducing fluid loss

#685
20140060843
2014-03-06

Wellbore servicing compositions and methods of making and using same

#686
20140014332
2014-01-16

Methods relating to designing wellbore strengthening fluids

#687
20130341025
2013-12-26

Method of using phthalic and terephthalic acids and derivatives thereof in well treatment operations

#688
20130319670
2013-12-05

METHODS FOR SERVICING SUBTERRANEAN WELLS

#689
20130299241
2013-11-14

Prediction and diagnosis of lost circulation in wells

#690
20130296199
2013-11-07

Drilling lost circulation material

#691
20130284518
2013-10-31

METHOD OF USING MULTI-COMPONENT FIBERS AS LOST-CIRCULATION MATERIAL

#692
20130269928
2013-10-17

Downhole tool for use in a drill string

#693
20130233558
2013-09-12

Methods for Servicing Subterranean Wells

#694
20130233553
2013-09-12

Methods for servicing subterranean wells

#695
20130225457
2013-08-29

Drilling fluid and method for drilling in coal-containing formations

#696
20130206479
2013-08-15

Drilling fluid and method for drilling in coal-containing formations

#697
20130160998
2013-06-27

Lost Circulation Materials and Methods of Using Same

#698
20130126177
2013-05-23

Method for building and forming a plug in a horizontal wellbore

#699
20130126164
2013-05-23

RELEASING ACTIVATORS DURING WELLBORE OPERATIONS

#700
20130112414
2013-05-09

Engineered methods and materials for wellbore strengthening in subterranean operations

#701
20130087331
2013-04-11

Lost-circulation material made from a recycled ceramic

#702
20130085086
2013-04-04

Fluid loss additives and methods of making and using same

#703
20130068481
2013-03-21

Bottom hole assembly for deploying an expandable liner in a wellbore

#704
20130068478
2013-03-21

Permeable lost circulation drilling liner

#705
20130037325
2013-02-14

LOST CIRCULATION MATERIAL FROM DRILLING FLUID PACKAGING

#706
20130025863
2013-01-31

Methods for servicing subterranean wells

#707
20130014938
2013-01-17

Apparatus for stage-cementing an oil well

#708
20130008648
2013-01-10

Apparatus and method for well operations

#709
20130008647
2013-01-10

Apparatus and Method for Well Operations

#710
20120325559
2012-12-27

Core capture and recovery from unconsolidated or friable formations and methods of use

#711
20120322695
2012-12-20

Methods for controlling lost circulation in a subterranean well and materials there for

#712
20120285692
2012-11-15

Methods of zonal isolation and treatment diversion

#713
20120241163
2012-09-27

Managed pressure drilling with rig heave compensation

#714
20120211279
2012-08-23

Method and apparatus for strengthening a wellbore

#715
20120205102
2012-08-16

Well treatment

#716
20120152000
2012-06-21

METHODS AND SYSTEMS FOR CHARACTERIZING LCM PARTICLE PLUGGING AND RHEOLOGY IN REAL TIME

#717
20120094878
2012-04-19

Non-damaging bimodal stimulation composition and method of use thereof

#718
20120090842
2012-04-19

Methods and compositions for suspending fluids in a wellbore

#719
20120073818
2012-03-29

Mixing tank and method of use

#720
20120048550
2012-03-01

Methods useful for controlling fluid loss in subterranean formations

#721
20120048549
2012-03-01

Polymer Emulsions And Well Treatment Fluids

#722
20110315381
2011-12-29

COMPOSITIONS AND METHOD FOR USE IN PLUGGING A WELL

#723
20110297375
2011-12-08

Composition for borehole treatment

#724
20110290012
2011-12-01

Method and apparatus for fluid loss measurements of wellbore fluids

#725
20110220350
2011-09-15

IDENTIFICATION OF LOST CIRCULATION ZONES

#726
20110220349
2011-09-15

METHODS FOR MINIMIZING FLUID LOSS TO AND DETERMINING THE LOCATIONS OF LOST CIRCULATION ZONES

#727
20110186297
2011-08-04

Applications of smart fluids in well service operations

#728
20110183871
2011-07-28

Method and composition for curing lost circulation

#729
20110155374
2011-06-30

Method for treating well bore with polyurethane composition

#730
20110088905
2011-04-21

Method for impulse stimulation of oil and gas well production

#731
20110056704
2011-03-10

METHOD AND DEVICE FOR CASING A BORED WELL PORTION

#732
20110011591
2011-01-20

Temporary fluid diversion agents for use in geothermal well applications

#733
20100314118
2010-12-16

Liquid crystals for drilling, completion and production fluids

#734
20100307747
2010-12-09

Engineered fibers for well treatments

#735
20100300760
2010-12-02

Enhanced smear effect fracture plugging process for drilling systems

#736
20100294498
2010-11-25

Viscoelastic surfactant based wellbore fluids and methods of use

#737
20100250204
2010-09-30

System and method for minimizing lost circulation

#738
20100230169
2010-09-16

COMPOSITIONS AND METHODS FOR INHIBITING LOST CIRCULATION DURING WELL OPERATIONS

#739
20100230164
2010-09-16

COMPOSITIONS AND METHODS FOR INHIBITING LOST CIRCULATION DURING WELL OPERATION

#740
20100193244
2010-08-05

Drilling fluid additive for reducing lost circulation in a drilling operation

#741
20100181073
2010-07-22

Method for controlling loss of drilling fluid

#742
20100152070
2010-06-17

DRILLING LOST CIRCULATION MATERIAL

#743
20100139387
2010-06-10

Methods and systems for characterizing LCM particle plugging and rheology in real time

#744
20100089650
2010-04-15

Drilling fluid and method for drilling in coal-containing formations

#745
20100088078
2010-04-08

Method and apparatus for drilling a probabilistic approach

#746
20090321142
2009-12-31

Well Drilling Method for Prevention of Lost Circulation of Drilling Muds

#747
20090286697
2009-11-19

LOST CIRCULATION COMPOSITION

#748
20090272580
2009-11-05

Drilling system with drill string valves

#749
20090260818
2009-10-22

Microwave-based downhole activation method for wellbore consolidation applications

#750
20090260430
2009-10-22

Method and Apparatus for Measurement of Formation Fluid Loss

#751
20090188718
2009-07-30

Methods of detecting, preventing, and remediating lost circulation

#752
20090120635
2009-05-14

Apparatus and method for maintaining boost pressure to high-pressure pumps during wellbore servicing operations

#753
20080264691
2008-10-30

Drilling fluid containing a recoverable lost circulation material and method of using and recovering the same

#754
20080147367
2008-06-19

Methods for using high-yielding non-Newtonian fluids for severe lost circulation prevention

#755
20080110627
2008-05-15

Well treating method to prevent or cure lost-circulation

#756
20080110621
2008-05-15

Managing lost returns in a wellbore

#757
20080041595
2008-02-21

Fluid loss control system and method for controlling fluid loss

#758
20080035374
2008-02-14

Method of drilling a lossy formation

#759
20080026958
2008-01-31

Magnesium peroxide difunctional components for cellulose derivatives and associated methods

#760
20070056730
2007-03-15

Well treating method to prevent or cure lost-circulation

#761
20070032388
2007-02-08

Zeolite-containing drilling fluids

#762
20070007006
2007-01-11

Methods and systems for using high-yielding non-Newtonian fluids for severe lost circulation prevention

#763
20060272860
2006-12-07

Methods of improving well bore pressure containment integrity

#764
20060266522
2006-11-30

Methods useful for controlling fluid loss during sand control operations

#765
20060266519
2006-11-30

Methods of improving well bore pressure containment integrity

#766
20060266107
2006-11-30

Methods of improving well bore pressure containment integrity

#767
20060237192
2006-10-26

Lost circulation composition

#768
20060137875
2006-06-29

Methods useful for controlling fluid loss in subterranean formations

#769
20050269085
2005-12-08

Method for sealing lost circulation zones

#770
20050217852
2005-10-06

Method of sealing subterranean zones

#771
20050109540
2005-05-26

Method of drilling with magnetorheological fluid

#772
20050011678
2005-01-20

Method and device for injecting a fluid into a formation

#773
20050000734
2005-01-06

Zeolite-containing drilling fluids

#774
18911321
2025-08-26

Hydrogen sulfide treatment method for crude oil/sour gas

#775
18780564
2025-02-04

Resin slurry plugging system suitable for fractured-vuggy formation and preparation and use thereof

#776
18763303
2024-10-29

Removing hydrogen sulfide from subterranean geological formation with a copper magnesium iron layered triple hydroxide zeolite material in a water-based drilling fluid

#777
18737708
2025-10-14

Method and composition for treating lost circulation

#778
18661631
2024-10-29

Biomimetic nacre-toughness cement slurry based on in-situ polymerization of fluid loss additive, preparation method and application thereof

#779
18629458
2025-07-01

Divalent-brine-based high density drilling fluids

#780
18597009
2025-04-08

Lost circulation material tool

#781
18479540
2024-09-10

Remedying lost circulation

#782
18408861
2025-07-08

Method and apparatus for delivering and setting a eutectic alloy plug to cure loss-of-circulation in drilling applications

#783
18367870
2024-08-27

Loss prevention screen

#784
18296281
2024-08-20

Sized bridging agents, low density pill and fluid compositions comprising said agents, and methods of controlling fluid loss and formation damage using said compositions

#785
18225883
2024-09-24

Active filter cake component for reservoir drill-in fluids to eliminate acid treatment

#786
18101460
2024-03-19

Curing lost circulation of oil-based drilling muds

#787
18057850
2024-01-23

Lost circulation material package with tailored particle size distribution

#788
17959542
2023-06-13

Unfoldable device for controlling loss circulation

#789
17877417
2023-10-24

Methods of forming hydrophobic surfaces for enhancing performance of geothermal operations

#790
17751822
2022-10-25

Palm oil invert emulsion hydrogen sulfide mitigating drilling fluid and method of drilling subterranean geological formation

#791
17751809
2022-11-08

Vegetable oil invert emulsion hydrogen sulfide mitigating drilling fluid and method of drilling subterranean geological formation

#792
17727063
2023-01-03

Leak-proof lost-circulation control water-based drilling fluid composition and preparation method and use thereof

#793
17564439
2023-04-11

Methods of reducing lost circulation in a wellbore

#794
17546417
2023-01-03

Wellbore servicing fluids and methods for controlling fluid losses in permeable zones

#795
17536554
2022-11-15

Composition and method for controlling lost circulation

#796
17454251
2023-02-07

Method and drilling system for mitigating lost circulation with basaltic particles

#797
17009485
2022-02-01

Lost circulation material having tentacles

#798
16943434
2022-01-04

Epoxidized alpha olefin based lubricant for water-based drilling fluids

#799
16842469
2021-06-22

Composition and method of manufacturing of whole and ground date palm seed lost circulation material (LCM)

#800
16720982
2020-12-15

Downhole ultraviolet system for mitigating lost circulation

#801
16720947
2020-11-24

Downhole ultrasonic actuator system for mitigating lost circulation

#802
16682966
2021-01-12

Composition and method of manufacturing of whole date palm seed lost circulation material (LCM)

#803
16561927
2020-07-28

Sphere-shaped lost circulation material (LCM) having hooks and latches

#804
16281535
2020-05-19

Method and materials to convert a drilling mud into a solid gel based lost circulation material

#805
16281503
2020-05-19

Method and materials to convert a drilling mud into a solid gel based lost circulation material

#806
16266605
2019-06-18

Hybrid particle mix for seal and plug quality enhancement

#807
16262386
2019-06-25

Hybrid particle mix for seal and plug quality enhancement

#808
16044313
2024-01-02

Method of using crosslinked guar polymer as fluid loss pill

#809
15944957
2019-06-18

Wellbore drill bit nozzle

#810
15928979
2019-03-26

Trimodal hybrid loss prevention material (LPM) for preventative and curative loss control

#811
15889668
2019-04-23

ARC hybrid particle mix for seal and plug quality enhancement

#812
15829532
2018-09-25

Loss circulation material composition comprising oil-swellable and desolvated polymer gels

#813
15788461
2018-12-04

Loss circulation compositions (LCM) having portland cement clinker

#814
15788449
2018-12-04

Loss circulation compositions (LCM) having Portland cement clinker

#815
14878778
2016-05-31

Reservoir protecting agent composition, drilling fluid for middle permeability reservoirs and use thereof

#816
13646306
2015-05-26

Method for lost circulation reduction in drilling operations