ClassID:

135723

E21B49/003 - page 2 - CPC Classification

Classification description:

Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions

Recent Application in this class:
#301
20190048705
2019-02-14

Method of, and a system for, controlling a drilling operation

#302
20190041182
2019-02-07

Tubular wear volume determination using stretch correction

#303
20190017378
2019-01-17

Natural Resource Reservoir Charging

#304
20190017376
2019-01-17

Determining spotting fluid properties

#305
20180371901
2018-12-27

CONTROL OF DRILLING SYSTEM OPERATIONS BASED ON DRILL BIT MECHANICS

#306
20180355714
2018-12-13

System and method for controlling linear movement using a tapered MR valve

#307
20180347354
2018-12-06

Collaborative sensing and prediction of source rock properties

#308
20180347353
2018-12-06

MCI logging for processing downhole measurements

#309
20180347349
2018-12-06

Acoustic coupler for downhole logging while drilling applications

#310
20180340416
2018-11-29

Methods of optimal selection and sizing of electric submersible pumps

#311
20180340410
2018-11-29

Systems and methods for drill bit and cutter optimization

#312
20180334897
2018-11-22

DRILLING CONTROL BASED ON BRITTLENESS INDEX CORRELATION

#313
20180334896
2018-11-22

Geosteering based on automated well performance prediction

#314
20180320513
2018-11-08

Apparatuses and methods for obtaining at-bit measurements for an earth-boring drilling tool

#315
20180320511
2018-11-08

Acoustic flow meter tool and related methods

#316
20180282605
2018-10-04

METHOD OF MONITORING A PARAMETER OF A HYDROCARBON WELL, PIPELINE OR FORMATION

#317
20180266246
2018-09-20

Apparatus, computer readable medium, and program code for evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system

#318
20180266245
2018-09-20

Downhole 3D geo steering viewer for a drilling apparatus

#319
20180258761
2018-09-13

System and tool with increased forecast accuracy to configure well settings in mature oil fields

#320
20180239523
2018-08-23

Methods and systems for gaze enabled collaborative intelligence

#321
20180239047
2018-08-23

Multi-component induction logging data processing in non-circular boreholes

#322
20180223656
2018-08-09

Near-bit ultradeep measurement system for geosteering and formation evaluation

#323
20180223612
2018-08-09

Multiple distributed pressure measurements

#324
20180217745
2018-08-02

Methods and systems for real-time closed-loop collaborative intelligence

#325
20180195376
2018-07-12

Guided drill system for oil reservoir drilling

#326
20180188401
2018-07-05

IMAGING SUBTERRANEAN ANOMALIES USING CROSS-WELL DOPPLER ARRAYS

#327
20180187540
2018-07-05

ARRANGEMENT FOR CONTROLLING COLLARING DRILLING

#328
20180187063
2018-07-05

Conductive Weighting Agents and Fluids Incorporating The Same

#329
20180180418
2018-06-28

Extending the range of a MEMS gyroscope using eccentric accelerometers

#330
20180179884
2018-06-28

System and method for determining drilling parameters based on hydraulic pressure associated with a directional drilling system

#331
20180172873
2018-06-21

Antennas for wellbore logging tools having a plurality of ferrite channels orthogonal to the plurality of winding grooves

#332
20180171772
2018-06-21

Apparatus and methods using acoustic and electromagnetic emissions

#333
20180142552
2018-05-24

System and method for controlling linear movement using a tapered MR valve

#334
20180128102
2018-05-10

Sensing formation properties during wellbore construction

#335
20180113962
2018-04-26

Adaptive resource reservoir development

#336
20180106147
2018-04-19

Apparatus and method using measurements taken while drilling cement to obtain absolute values of mechanical rock properties along a borehole

#337
20180100950
2018-04-12

Collocated multitone acoustic beam and electromagnetic flux leakage evaluation downhole

#338
20180100390
2018-04-12

GEOLOGICAL ASSET UNCERTAINTY REDUCTION

#339
20180087377
2018-03-29

Methods for formulating a cement slurry for use in a subterranean salt formation using geometric modeling

#340
20180066517
2018-03-08

Timeline visualization of events for monitoring well site drilling operations

#341
20180024266
2018-01-25

Modular resistivity sensor for downhole measurement while drilling

#342
20180023382
2018-01-25

Systems and methods for determining and/or using estimate of drilling efficiency

#343
20180010437
2018-01-11

Methods and systems for estimating the hardness of a rock mass

#344
20170370213
2017-12-28

Microbiome based systems, apparatus and methods for the exploration and production of hydrocarbons

#345
20170370212
2017-12-28

Measuring current from an electrode using a non-linear element

#346
20170356289
2017-12-14

Rotor catch apparatus for downhole motor and method of use

#347
20170350229
2017-12-07

Depth-based borehole trajectory control

#348
20170335662
2017-11-23

Computer implemented method for generating a field development plan (FDP) for the exploitation of oil and gas reservoirs

#349
20170335629
2017-11-23

Remotely controlled apparatus for downhole applications and methods of operation

#350
20170328191
2017-11-16

Methods and systems for optimizing a drilling operation based on multiple formation measurements

#351
20170322339
2017-11-09

Post-well reservoir characterization using image-constrained inversion

#352
20170321545
2017-11-09

Functional earth model parameterization for resistivity inversion

#353
20170314332
2017-11-02

Drilling direction correction of a steerable subterranean drill in view of a detected formation tendency

#354
20170306703
2017-10-26

Hybrid mechanical-laser drilling equipment

#355
20170298724
2017-10-19

Electromagnetically coupled band-gap transceivers

#356
20170292902
2017-10-12

Time/amplitude domain reflectometry as a technique for measurement of surface wettability

#357
20170285196
2017-10-05

Determining displacement between seismic images using optical flow

#358
20170275989
2017-09-28

Apparatus and method using measurements taken while drilling cement to obtain absolute values of mechanical rock properties along a borehole

#359
20170274333
2017-09-28

Optimizing drilling mud shearing

#360
20170269255
2017-09-21

Simultaneous error correction and inversion

#361
20170268324
2017-09-21

Downhole state-machine-based monitoring of vibration

#362
20170260855
2017-09-14

Estimation of formation properties based on borehole fluid and drilling logs

#363
20170248719
2017-08-31

Methods of generation of fracture density maps from seismic data

#364
20170248013
2017-08-31

Near-bit ultradeep measurement system for geosteering and formation evaluation

#365
20170241266
2017-08-24

Assessment and production of minerals by directed horizontal drilling

#366
20170235007
2017-08-17

Drilling noise categorization and analysis

#367
20170211370
2017-07-27

METHOD AND SYSTEM FOR TRANSMITTING INFORMATION IN A JET DRILLING SYSTEM

#368
20170205531
2017-07-20

GEOLOGICAL MODELING WORKFLOW

#369
20170205523
2017-07-20

Active dampening for a wellbore logging tool using iterative learning techniques

#370
20170204689
2017-07-20

Estimating drilling fluid properties and the uncertainties thereof

#371
20170198569
2017-07-13

Mud pulse telemetry

#372
20170191364
2017-07-06

Modular Resistivity Sensor for Downhole Measurement While Drilling

#373
20170191359
2017-07-06

Employing a target risk attribute predictor while drilling

#374
20170183964
2017-06-29

Methods for formulating a cement slurry for use in a subterranean salt formation using geometric modeling

#375
20170183952
2017-06-29

Formation dip geo-steering method

#376
20170176361
2017-06-22

Apparatus and method for processing and interpreting NMR logging data

#377
20170175520
2017-06-22

Apparatuses and methods for obtaining at-bit measurements for an earth-boring drilling tool

#378
20170161885
2017-06-08

Shale shaker imaging system

#379
20170160423
2017-06-08

Antenna assembly using ferrites within an interposed sleeve for wellbore logging tools

#380
20170159422
2017-06-08

Hydrocarbon well performance monitoring system

#381
20170153343
2017-06-01

Evaluation of rock boundaries and acoustic velocities using drill bit sound during vertical drilling

#382
20170145822
2017-05-25

Monitoring of drilling operations using discretized fluid flows

#383
20170145804
2017-05-25

System and method for mapping reservoir properties away from the wellbore

#384
20170138175
2017-05-18

Methods of well trajectory and drilling optimized control for fracture-vuggy carbonate formation

#385
20170130703
2017-05-11

GEOTHERMAL LOOP ENERGY PRODUCTION SYSTEMS

#386
20170122099
2017-05-04

Multiple downhole sensor digital alignment using spatial transforms

#387
20170115263
2017-04-27

Chemiresistive sensors, downhole tools including such sensors, and related methods

#388
20170114616
2017-04-27

USE OF DRILLING DATA FOR ENGINEERED COMPLETIONS

#389
20170107808
2017-04-20

Monitoring control and/or optimization of borehole sidetracking

#390
20170081953
2017-03-23

System and method for determining BHA position during lateral drilling

#391
20170075023
2017-03-16

Correcting for monitoring electrodes current leakage in galvanic tools

#392
20170067337
2017-03-09

Apparatus and method using measurements taken while drilling to generate and map mechanical boundaries and mechanical rock properties along a borehole

#393
20170058669
2017-03-02

APPARATUS AND METHOD OF USING MEASUREMENT WHILE DRILLING DATA TO GENERATE MECHANICAL ROCK-STRENGTH PROPERTIES AND MAP MECHANICAL ROCK-STRENGTH PROPERTIES ALONG A BOREHOLE

#394
20170044896
2017-02-16

Real-Time Calculation of Maximum Safe Rate of Penetration While Drilling

#395
20170030186
2017-02-02

Fast test application for shock sensing subassemblies using shock modeling software

#396
20170023695
2017-01-26

GENERATOR FOR LATEROLOG TOOL

#397
20170009575
2017-01-12

Rock strength and in-situ stresses from drilling response

#398
20170009543
2017-01-12

Elastic pipe control with managed pressure drilling

#399
20160376887
2016-12-29

Method for determining pore pressure in oil and gas wells using basin thermal characteristics

#400
20160376886
2016-12-29

Methods for evaluating inflow and outflow in a subterraean wellbore

#401
20160369626
2016-12-22

Formation resistivity measurement apparatus, systems, and methods

#402
20160362972
2016-12-15

Systems and methods for estimating forces on a drill bit

#403
20160348501
2016-12-01

Apparatus, computer readable medium, and program code for evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system

#404
20160333672
2016-11-17

Power loss dysfunction characterization

#405
20160319660
2016-11-03

Apparatuses and methods for at-bit resistivity measurements for an earth-boring drilling tool

#406
20160319655
2016-11-03

Method and device using productivity index in drill guidance for drilling slanted water injection wells

#407
20160312554
2016-10-27

Multiple distributed pressure measurements

#408
20160312537
2016-10-27

METHOD OF FORMING A BORE

#409
20160291575
2016-10-06

Directional driller quality reporting system and method

#410
20160291190
2016-10-06

Rotating sensor mechanism for seismic while drilling sensors

#411
20160290132
2016-10-06

Microbiome based systems, apparatus and methods for the exploration and production of hydrocarbons

#412
20160290130
2016-10-06

Apparatus and method using measurements taken while drilling to map mechanical boundaries and mechanical rock properties along a borehole

#413
20160283651
2016-09-29

Microbiome based systems, apparatus and methods for the exploration and production of hydrocarbons

#414
20160273354
2016-09-22

Optical fluid model base construction and use

#415
20160273353
2016-09-22

DETERMINING FORMATION GAS COMPOSITION DURING WELL DRILLING

#416
20160265992
2016-09-15

Determining spotting fluid properties

#417
20160258268
2016-09-08

Distributed sensing with a multi-phase drilling device

#418
20160251901
2016-09-01

Drilling apparatus

#419
20160245064
2016-08-25

Control method

#420
20160245050
2016-08-25

METHODS FOR DRILLING AND PRODUCING FROM COAL BED FORMATIONS AND ASSOCIATED APPARATUS

#421
20160245048
2016-08-25

Systems and methods for optimizing drilling operations using transient cuttings modeling and real-time data

#422
20160215606
2016-07-28

Methods and computing systems for processing and transforming collected data to improve drilling productivity

#423
20160203239
2016-07-14

Method and analysis for holistic casing design for planning and real-time

#424
20160186496
2016-06-30

METHODS AND APPARATUS FOR WELL PRODUCTIVITY

#425
20160177703
2016-06-23

Motor MWD device and methods

#426
20160160640
2016-06-09

System for tracking and sampling wellbore cuttings using RFID tags

#427
20160146003
2016-05-26

Systems and methods for characterizing a spatial frequency of interface regions within a subterranean formation

#428
20160145991
2016-05-26

Probabilistic methodology for real time drilling

#429
20160145726
2016-05-26

HIGH-RESISTIVITY PARTICLE-MATRIX COMPOSITE MATERIALS, DOWNHOLE TOOLS INCLUDING SUCH COMPOSITE MATERIALS, AND RELATED METHODS

#430
20160138392
2016-05-19

Bitumen quantification using vibrational spectroscopy

#431
20160130940
2016-05-12

Systems and methods for formation fluid sampling

#432
20160130938
2016-05-12

SEISMIC WHILE DRILLING SYSTEM AND METHODS

#433
20160123141
2016-05-05

RESERVOIR HYDROCARBON CALCULATIONS FROM SURFACE HYDROCARBON COMPOSITIONS

#434
20160123139
2016-05-05

Methods and systems for using a well evaluation pill to characterize subterranean formations and fluids

#435
20160123118
2016-05-05

Methods and systems for designing drilling systems

#436
20160123096
2016-05-05

IN-SITU MINING OF ORES FROM SUBSURFACE FORMATIONS

#437
20160108726
2016-04-21

System and method for determining soil characteristics and drilling instability during horizontal directional drilling

#438
20160108714
2016-04-21

Methods and systems for real-time monitoring and processing of wellbore data

#439
20160097871
2016-04-07

Evaluation of rock boundaries and acoustic velocities using drill bit sound during vertical drilling

#440
20160084061
2016-03-24

Method of, and a system for, controlling a drilling operation

#441
20160076368
2016-03-17

Method of determining when tool string parameters should be altered to avoid undesirable effects that would likely occur if the tool string were employed to drill a borehole and method of designing a tool string

#442
20160069182
2016-03-10

Apparatus and method using measurements taken while drilling to map mechanical boundaries and mechanical rock properties along a borehole

#443
20160061022
2016-03-03

Hydrocarbon well performance monitoring system

#444
20160054729
2016-02-25

Drilling a wellbore

#445
20160053597
2016-02-25

HYDRAULIC FRACTURING WHILE DRILLING AND/OR TRIPPING

#446
20160053545
2016-02-25

Resonance-tuned drill string components

#447
20160053544
2016-02-25

METHOD FOR THE CHISEL-LESS FORMATION OF BOREHOLES FOR DEEP BORES AND CHISEL-LESS DRILLING SYSTEM FOR CARRYING OUT SAID METHOD

#448
20160040528
2016-02-11

System and method for controlling linear movement using a tapered MR valve

#449
20160025895
2016-01-28

Well treatment with digital core analysis

#450
20150377003
2015-12-31

System and method for surface steerable drilling to provide formation mechanical analysis

#451
20150369042
2015-12-24

Method and system for predicting drilling events

#452
20150361725
2015-12-17

Directional drilling control devices and methods

#453
20150345262
2015-12-03

Automated drilling optimization

#454
20150322720
2015-11-12

System and method for detecting drilling events using an opto-analytical device

#455
20150313010
2015-10-29

Electronic devices for high temperature drilling operations

#456
20150300161
2015-10-22

Down Hole Subsurface Wave System with Drill String Wave Discrimination and Method of Using Same

#457
20150300150
2015-10-22

Systems and methods for look ahead resistivity measurement with offset well information

#458
20150292323
2015-10-15

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

#459
20150292285
2015-10-15

FLUID FLOW DURING LANDING OF LOGGING TOOLS IN BOTTOM HOLE ASSEMBLY

#460
20150284811
2015-10-08

Microbiome based systems, apparatus and methods for the exploration and production of hydrocarbons

#461
20150284619
2015-10-08

Electrically conductive wellbore fluids and methods of use

#462
20150278407
2015-10-01

Oil and gas rig data aggregation and modeling system

#463
20150276970
2015-10-01

Reducing conductive casing effect in transient cased-hole resistivity logging

#464
20150275659
2015-10-01

Telemetry diagnostics

#465
20150260037
2015-09-17

Downhole drilling optimization collar with fiber optics

#466
20150260031
2015-09-17

System and method for steering in a downhole environment using vibration modulation

#467
20150252623
2015-09-10

DIRECTIONAL DRILLING INSTRUMENT

#468
20150248502
2015-09-03

Interactive wellbore design management

#469
20150247399
2015-09-03

System and method for determining drilling parameters based on hydraulic pressure associated with a directional drilling system

#470
20150233805
2015-08-20

Bending testing

#471
20150233233
2015-08-20

Measuring behind casing hydraulic conductivity between reservoir layers

#472
20150227841
2015-08-13

Control variable determination to maximize a drilling rate of penetration

#473
20150219791
2015-08-06

Method of and apparatus for calculating UCS and CCS

#474
20150219780
2015-08-06

Acoustic multi-modality inversion for cement integrity analysis

#475
20150219601
2015-08-06

Method of electromagnetic defectoscopy for multi-string wells and the electromagnetic downhole defectoscope

#476
20150218940
2015-08-06

System and method for analyzing downhole drilling parameters using an opto-analytical device

#477
20150218939
2015-08-06

GRAPHICAL METHOD FOR ASSISTING MULTI-ZONES COMMINGLING DECISION

#478
20150218938
2015-08-06

Hard-Mounted EM Telemetry System for MWD Tool in Bottom Hole Assembly

#479
20150218933
2015-08-06

Downhole drilling optimization collar with fiber optics

#480
20150218888
2015-08-06

WELL CONSTRUCTION GEOSTEERING APPARATUS, SYSTEM, AND PROCESS

#481
20150211350
2015-07-30

Method for Monitoring and Controlling Drilling Fluids Process

#482
20150198037
2015-07-16

Back titration methods for scaling cations and downhole tools for performing such methods

#483
20150198035
2015-07-16

Methods and systems of analyzing wellbore drilling operations

#484
20150185363
2015-07-02

DATA VISUALIZATION IN BOREHOLE SYSTEMS

#485
20150184508
2015-07-02

COMPUTING SYSTEMS, TOOLS, AND METHODS FOR SIMULATING WELLBORE RE-ENTRY

#486
20150183073
2015-07-02

Apparatus for measuring drilling resistance in a material to be examined

#487
20150176402
2015-06-25

Applications Based On Fluid Properties Measured Downhole

#488
20150176401
2015-06-25

Casing wear estimation

#489
20150176395
2015-06-25

Hydrocarbon well performance monitoring system

#490
20150176393
2015-06-25

Clustering process for analyzing pressure gradient data

#491
20150168581
2015-06-18

Method and system of quantitative cement evaluation using logging while drilling

#492
20150167454
2015-06-18

Probabilistic determination of health prognostics for selection and management of tools in a downhole environment

#493
20150167453
2015-06-18

System and method for defining permissible borehole curvature

#494
20150167393
2015-06-18

Look Ahead Advance Formation Evaluation Tool

#495
20150167392
2015-06-18

Determining drilling state for trajectory control

#496
20150152723
2015-06-04

Displaceable components in drilling operations

#497
20150149092
2015-05-28

WEARABLE INTERFACE FOR DRILLING INFORMATION SYSTEM

#498
20150143889
2015-05-28

System and method for determining a borehole azimuth using gravity in-field referencing

#499
20150142319
2015-05-21

Hydrocarbon well performance monitoring system

#500
20150142315
2015-05-21

MARINE RISER MANAGEMENT SYSTEM AND AN ASSOCIATED METHOD

#501
20150136489
2015-05-21

METHOD AND APPARATUS FOR REMOTELY CHANGING FLOW PROFILE IN CONDUIT AND DRILLING BIT

#502
20150136487
2015-05-21

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

#503
20150136486
2015-05-21

Coring system considering tilting of coring part and method of compensating depth of coring part using the same

#504
20150134257
2015-05-14

Automatic wellbore condition indicator and manager

#505
20150129307
2015-05-14

Method and apparatus for protecting downhole components from shock and vibration

#506
20150129306
2015-05-14

Method for calculating and displaying optimized drilling operating parameters and for characterizing drilling performance with respect to performance benchmarks

#507
20150127274
2015-05-07

Method and apparatus for removal of the double indication of defects in remote eddy current inspection of pipes

#508
20150122547
2015-05-07

Method to mitigate bit induced vibrations by intentionally modifying mode shapes of drill strings by mass or stiffness changes

#509
20150114714
2015-04-30

In-situ downhole cuttings analysis

#510
20150112597
2015-04-23

Fluid flow back prediction

#511
20150107899
2015-04-23

Automated control of toolface while slide drilling

#512
20150106015
2015-04-16

Life-time management of downhole tools and components

#513
20150101397
2015-04-16

Method for testing non-uniform loads in pipes

#514
20150096805
2015-04-09

Downhole closed loop drilling system with depth measurement

#515
20150090498
2015-04-02

Drilling system

#516
20150088425
2015-03-26

System, Method & Computer Program Product to Simulate the Progressive Failure of Rupture Disks in Downhole Environments

#517
20150083493
2015-03-26

Drilling System and Associated System and Method for Monitoring, Controlling, and Predicting Vibration in an Underground Drilling Operation

#518
20150083404
2015-03-26

DETERMINING PROPPANT AND FLUID DISTRIBUTION

#519
20150081222
2015-03-19

Control variable determination to maximize a drilling rate of penetration

#520
20150081221
2015-03-19

Drilling system failure risk analysis method

#521
20150072319
2015-03-12

SYSTEM AND METHOD FOR INTEGRATED MARINE AND PROCESS SIMULATION

#522
20150068806
2015-03-12

Method and system for in situ, continuous and real-time analysis of mineral content in drilling debris

#523
20150066371
2015-03-05

Integrated Oilfield Decision Making System and Method

#524
20150060143
2015-03-05

Remotely controlled apparatus for downhole applications and methods of operation

#525
20150060054
2015-03-05

Modeling and production of tight hydrocarbon reservoirs

#526
20150053484
2015-02-26

Hole enlargement drilling device and methods for using same

#527
20150052988
2015-02-26

Apparatus for single degree of freedom inertial measurement unit platform rate isolation

#528
20150051838
2015-02-19

SYSTEM AND METHOD OF DETERMINING AND OPTIMIZING WATERFLOOD PERFORMANCE

#529
20150025806
2015-01-22

Mud pulse telemetry

#530
20140379312
2014-12-25

Method and system for generation of upscaled mechanical stratigraphy from petrophysical measurements

#531
20140379265
2014-12-25

REAL-TIME METHOD FOR DETERMINING THE POROSITY AND WATER SATURATION OF AN UNDERGROUND FORMATION USING GAS AND MUD LOGGING DATA

#532
20140358510
2014-12-04

SYSTEM AND METHOD FOR CHARACTERIZING UNCERTAINTY IN SUBTERRANEAN RESERVOIR FRACTURE NETWORKS

#533
20140350859
2014-11-27

Efficiency of pixel-based inversion algorithms

#534
20140284106
2014-09-25

Formation testing in managed pressure drilling

#535
20140166361
2014-06-19

Systems and methods for real time drilling fluid management

#536
20140136111
2014-05-15

OILFIELD PRODUCTION FORECASTING SYSTEM

#537
20140019102
2014-01-16

System, method and computer program product to simulate the progressive failure of rupture disks in downhole environments

#538
20130292178
2013-11-07

Methods and systems for real-time monitoring and processing of wellbore data

#539
20130270007
2013-10-17

Apparatuses and methods for obtaining at-bit measurements for an earth-boring drilling tool

#540
20130256033
2013-10-03

Multiple distributed pressure measurements

#541
20130096835
2013-04-18

Clustering process for analyzing pressure gradient data

#542
20130090855
2013-04-11

Methods for evaluating inflow and outflow in a subterranean wellbore

#543
20130085675
2013-04-04

Applications based on fluid properties measured downhole

#544
20130075160
2013-03-28

Apparatus, program product, and methods of evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system

#545
20130049982
2013-02-28

System and method for stick-slip correction

#546
20130043077
2013-02-21

Methods and systems for designing and/or selecting drilling equipment using predictions of rotary drill bit walk

#547
20130014993
2013-01-17

Formation testing in managed pressure drilling

#548
20130000980
2013-01-03

System and method for determining soil characteristics and drillstring instability during horizontal directional drilling

#549
20120273270
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