173333 ⎘
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current
Sub-classes:ACTIVE RESISTIVITY RANGING WHILE DRILLING AN OPERATIONAL WELL FOR SIMULTANEOUS DETECTION OF MULTIPLE TARGET WELLS
#2THREE-DIMENSIONAL RESISTIVITY RESERVOIR MAPPING
#3METHOD FOR INCREASING THE RESOLUTION OF IMAGE LOGS IN REAL TIME
#4WELLBORE FLUID SATURATION MAPPING
#5GEOSTEERING CONTROL FRAMEWORK
#6METHODS AND SYSTEMS FOR MULTI-WELL SIMULTANEOUS WELL LOGGING
#7METHOD TO IDENTIFY A WATER ENCROACHMENT ZONE OR PAY ZONE TO INFORM COMPLETION AND RECOVERY OPERATIONS
#8METHODS TO PERFORM JOINT INVERSION OF FORMATION DATA AND JOINT INVERSION SYSTEMS
#9CAPACITIVE-RESISTIVE IMAGING SYSTEM
#10IDENTIFICATION OF CLAYS IN POROUS MEDIA BY INTEGRATING ELECTROMAGNETIC MEASUREMENTS AND TEMPERATURE GRADIENT ANALYSIS
#11IN SITU CONCENTRATION OF HYDROCARBONS IN ROCK
#12Sand shale formation physical property evaluation method and system for precise deep oil and gas navigation
#13Determining Invaded Zones In Resistivity Logging
#14EFFECTIVE RESISTIVITY MODELS FOR GEOSTEERING DECISIONS
#15Identification of Borehole Flow Members
#16GRADATIONAL RESISTIVITY MODELS WITH LOCAL ANISOTROPY FOR DISTANCE TO BED BOUNDARY INVERSION
#17Concurrent oil saturation and porosity imaging using completion-based on-demand electrodes
#18ESTIMATION OF ELECTROMAGNETIC TOOL DETECTION CAPABILITY IN THREE-DIMENSIONAL FORMATION
#19SYSTEMS AND METHODS FOR PROXIMITY DETECTION AND INTERPRETATION OF NEAR PARALLEL CASED WELLS
#20Determination of continuous oil density log for reservoir characterization
#21Utilizing resistivity distribution curves to improve geo-steering
#22RESERVOIR PROPERTIES DERIVED USING ULTRA-DEEP RESISTIVITY INVERSION DATA
#23METHODS AND APPARATUS FOR DETERMINING DIELECTRIC CONSTANT AND RESISTIVITY WITH ELECTROMAGNETIC PROPAGATION MEASUREMENTS
#24METHODS OF DETERMINING WELLBORE INTEGRITY
#25METHOD FOR VALIDATING NON-MATRIX VUG FEATURES IN SUBTERRANEAN ROCKS
#26METHOD FOR ESTIMATING DEPTH OF HYDROCARBON RESERVOIR
#27Correlating true vertical depths for a measured depth
#28Iterative clustering for geosteering inversion
#29Application method of device for accurately evaluating vertical content distribution of undersea hydrate reservoir
#30Systems and methods for production and reservoir monitoring
#31Velocity correction with joint inversion
#32Obstacle detection systems and methods
#33SYSTEM AND METHOD FOR ENHANCING PETROPHYSICAL CHARACTERIZATION OF POROUS MEDIA
#34Methods and systems to determine tortuosity of rock and fluids in porous media
#35Dip correction for non-circular borehole and off-center logging
#36Determination of borehole characteristics using orientation components of azimuthal electromagnetic signals
#37Formation analysis incorporating identification of immovable and viscous hydrocarbons
#38Method for resistivity determination with borehole imagers
#39Correcting borehole images using machine-learning models
#40Method and system for processing well log data from multiple wells using machine learning
#41Machine learning approach for identifying mud and formation parameters based on measurements made by an electromagnetic imager tool
#42SYSTEM AND METHOD FOR MAPPING AND MONITORING RESERVOIRS BY ELECTROMAGNETIC CROSSWELL AND OPTIMIZING PRODUCTION
#43System and method for measuring mud properties
#44Logging and correlation prediction plot in real-time
#45Minimal electronic sensor collars
#46Dip correction for non-circular borehole and off-center logging
#47Method for estimating rock brittleness from well-log data
#48Virtual high-density well survey
#49Visualizing formation boundaries in near-vertical well drilling
#50Methods for performing formation evaluation and related systems
#51Crosslinked synthetic polymer-based reservoir drilling fluid
#52DOWNHOLE ELECTROMAGNETIC SENSING TECHNIQUES
#53Methods for transmitting data acquired downhole by a downhole tool
#54Electromagnetic prediction method for concealed mines
#55Formation resistivity evaluation system
#56Methods to configure a downhole electromagnetic tool and downhole electromagnetic tool calibration systems
#57Method for reducing stick-slip logging tools
#58Machine learning approach for identifying mud and formation parameters based on measurements made by an electromagnetic imager tool
#59Method for resistivity determination with borehole imagers
#60Electromagnetic insulating component used in well logging tool pad
#61Methods of determining wellbore integrity
#62Logging and correlation prediction plot in real-time
#63Obstacle detection systems and methods
#64Method to estimate formation resistivity
#65Air-hang calibration for resistivity-logging tool
#66Production-logging sensor
#67Locating multiple wellbores
#68Cross-slot bobbin and antenna shield for co-located antennas
#69Antenna shields for co-located antennas
#70Formation resistivity evaluation system
#71Device and method for measuring flow velocity and flow direction and geological parameters of groundwater through cross holes of deep wells
#72Calculation of mud angle for imaging wells with oil based muds
#73Two-way dual-tone methods and systems for synchronizing remote modules
#74Deconvolution-based enhancement of apparent resistivity and bed boundary identification in borehole resistivity imaging
#75Downhole electromagnetic sensing techniques
#76THREE-DIMENSIONAL FORMATION MICROSCANNER TOOL AND LOGGING METHOD USING THE SAME
#77Three dimensional visualization from point-by-point one dimensional inversion with bed azimuth
#78Enhancement of dynamic range of electrode measurements
#79Method and apparatus for automatically recognizing electrical imaging well logging facies
#80Avoiding geological bodies that are hazards to drilling operations
#81Signal processing of a multi-sub rotational resistivity logging tool
#82System and method for evaluating a formation using a statistical distribution of formation data
#83Apparatus for borehole imaging including a void-containing guard electrode
#84Distance-to-bed-boundary inversion solution pixelation
#85Optimization of excitation source placement for downhole telemetry operations
#86Bucking to reduce effects of conducting tubular
#87Dielectric logging with broadband excitation
#88Effective medium theory of acidized carbonate matrix resistivity employed to calculate the apparent geometric parameters of the wormholes
#89Method of determining subsurface properties using multifrequency electromagnetic depth sounding
#90EMU impulse antenna for low frequency radio waves using giant dielectric and ferrite materials
#91EMU impulse antenna with controlled directionality and improved impedance matching
#92Calibration of electromagnetic ranging tools
#93Apparatuses and methods for determining properties of subterranean layers
#94Methods of drilling with resistivity tools
#95EMU impulse antenna
#96System and Method of Estimating Leakage Current Distribution Along Long Conductor Extending into the Earth
#97Resistivity measurement for evaluating a fluid
#98Logging and correlation prediction plot in real-time
#99Breaker fluids and methods of use thereof
#100Downhole fluid characterization methods and systems using multi-electrode configurations
#101Methods of drilling with resistivity tools
#102Applying E-field antennas to resistivity logging tools
#103Formation dip determination using resistivity imaging tool
#104Methods of selecting an earth model from a plurality of earth models
#105Method and apparatus for determining permeability of reservoir
#106PRODUCTION AND STIMULATION MONITORING
#107Detection and avoidance of downhole noise and interference sources
#108Dual mode electromagnetic imaging of a borehole
#109Using an adjusted drive pulse in formation evaluation
#110Assessing organic richness using microresistivity images and acoustic velocity
#111Transferring logging data from an offset well location to a target well location
#112Electrical impedance tomography using a switchable array
#113Method of detecting substance saturation in a formation
#114Utilizing diverse excitation sources in electromagnetic ranging
#115Apparatus and method for monitoring production wells
#116System and method for determining water-filled porosity and water salinity in well cores and logs
#117Optimized production via geological mapping
#118System and method to measure or generate an electrical field downhole
#119Monitoring water flood location using potentials between casing and casing-mounted electrodes
#120EMU impulse antenna for low frequency radio waves using giant dielectric and ferrite materials
#121EMU impulse antenna with controlled directionality and improved impedance matching
#122Uniaxial anisotropy detection apparatus, systems, and methods
#123EMU impulse antenna
#124Systems and methods for determining tool center, borehole boundary, and/or mud parameter
#125Creation of structural earth formation models
#126Sleeve excitation for ranging measurements using electrode sources
#127Downhole fluid characterization methods and systems using multi-electrode configurations
#128Reducing effects of conductive mud on single-well ranging
#129Modular electrode tool for improved hydraulic fracture diagnostics
#130Method and article for evaluating mud effect in imaging tool measurement
#131Advanced workflow for evaluating formation damage and stabilization treatments
#132Precise calibration for galvanic tools
#133Borehole imaging sensor assembly
#134Data-quality evaluation of calculated true reservoir resistivity
#135Downhole apparatus and technique to measure fluid resistivity
#136Monitoring substances in a well annulus
#137Evaluation of formation utilizing wideband electromagnetic measurements
#138Method and apparatus for making resistivity measurements in a wellbore
#139Well infiltration area calculation using logging while drilling data
#140Measurement and control apparatus, systems, and methods
#141Electromagnetic wave propagation measurements without synchronization
#142Well monitoring using casing centralizers
#143Mud cake correction of formation measurement data
#144Downhole sensor deployment assembly
#145Downhole electromagnetic sensing techniques
#146Measuring current from an electrode using a non-linear element
#147Electric dipole surface antenna configurations for electromagnetic wellbore instrument telemetry
#148Radiation induced conductivity of oil based mud around pads of electrical imaging tools
#149Computer processing of borehole to surface electromagnetic transmitter survey data
#150Through-casing fiber optic electrical system for formation monitoring
#151Formation monitoring through the casing
#152Downhole Electrode Apparatus, Systems, And Methods
#153Geological log data processing methods and apparatuses
#154Bucking to reduce effects of conducting tubular
#155SYSTEM AND METHOD FOR MEASURING DOWNHOLE PARAMETERS
#156Methods and apparatus for measuring hydrogen sulfide in downhole fluids
#157Electrode-based tool measurement corrections based on leakage currents estimated using a predetermined internal impedance model or table
#158Downhole deep transient measurements with improved sensors
#159Selecting transmission frequency based on formation properties
#160Fast-changing dip formation resistivity estimation
#161Method and apparatus for detection and quantification of borehole standoff
#162Formation resistivity measurement apparatus, systems, and methods
#163Logging-while-drilling tool with interleaved instruments
#164Workflow for navigation with respect to oil-water contact using deep directional resistivity measurements
#165Systems and methods for removal of electromagnetic dispersion and attenuation for imaging of proppant in an induced fracture
#166Estimating subsurface formation and invasion properties
#167Method and apparatus for determining resistivity of a formation
#168Methods of logging
#169Breaker fluids and methods of use thereof
#170Crosslinked synthetic polymer-based reservoir drilling fluid
#171Optimization of excitation source placement for downhole ranging and telemetry operations
#172Method and system for petrophysical quantity estimation from dielectric and neutron capture cross section measurements
#173Multi-frequency micro induction and electrode arrays combination for use with a downhole tool
#174Method and system for formation texture and rock type identification
#175Test apparatus and a test method for the wetted perimeter of coal seam water injection
#176Borehole wall imaging tool having a grooved wall-contacting face
#177Encapsulated sensors and electronics
#178Laterolog array tool for performing galvanic measurement
#179Methods and systems for obtaining an electrical impedivity and/or resistivity image of a subterranean formation
#180Inversion techniques for real-time well placement and reservoir characterization
#181Locating multiple wellbores
#182Subsurface resistivity modeling with electromagnetic fields using a conductive casing
#183System and method for mapping deep anomalous zones of electrical resistivity
#184Resistivity imager with reduced borehole loading
#185Logging and correlation prediction plot in real-time
#186Method and apparatus for determining a fracture aperture in a wellbore
#187Workflow to use borehole completion as antenna for geophysical applications
#188Permanent EM monitoring systems using capacitively coupled source electrodes
#189Wear resistant electrodes for downhole imaging
#190Wear resistant electrodes for downhole imaging
#191Apparatuses and methods for at-bit resistivity measurements for an earth-boring drilling tool
#192Method and apparatus for monitoring an underground object
#193Resistivity logging tool with excitation current control
#194CURRENT DENSITY INVERSION
#195System and method for surveying a subsurface of the earth
#196METHODS FOR OBTAINING DATA FROM A SUBTERRANEAN FORMATION
#197Hybrid amplitude adjustment algorithm for resistivity logging tools
#198Complex fracture network mapping
#199High directionality galvanic and induction well logging tools with metamaterial focusing
#200Drilling collision avoidance apparatus, methods, and systems
#201Electromagnetic formation evaluation tool apparatus and method
#202Estimation of fluid properties from well logs
#203Auxiliary system for use in drilling
#204Electrical log processing near casing point
#205Reducing or preventing dissipation of electrical current and associated magnetic signal in a wellbore
#206Hydraulic fracture permeability characterization from electromagnetic measurements
#207Drilling wells in compartmentalized reservoirs
#208Device for measuring resistivity in a wellbore
#209Optimized SAGD well placement utilizing temperature and electromagnetic measurements
#210Array laterolog tool techniques
#211Inversion Technique For Fracture Characterization In Highly Inclined Wells Using Multiaxial Induction Measurements
#212Borehole Tool
#213Reconfigurable well logging system
#214Optimized production via geological mapping
#215Method of determining CEC and other properties from multi-frequency dielectric measurements
#216Crosstalk suppression or removal for galvanic measurements
#217Systems and methods for removal of electromagnetic dispersion and attenuation for imaging of proppant in an induced fracture
#218Method of imaging the electrical conductivity distribution of a subsurface
#219LWD resistivity imaging tool with adjustable sensor pads
#220Methods of and apparatuses for identifying geological characteristics in boreholes
#221Methods of and apparatuses for identifying geological characteristics in boreholes
#222MONITORING MATRIX ACIDIZING OPERATIONS
#223Method and apparatus for inversion in dielectric logging
#224Systems and methods for computing surface of fracture per volume of rock
#225DISTRIBUTED SURVEY SYSTEM FOR OBTAINING UNDERGROUND ELECTRICAL CHARACTERISTICS AND DISTRIBUTED SURVEY METHOD USING SAME
#226Systems and methods for determining annular fill material based on resistivity measurements
#227Apparatus and methods for communicating with a downhole tool
#228Multi-frequency dielectric borehole imager
#229Method and system for calibrating a downhole imaging tool
#230Well-Logging Device with Dielectric Thermoset Material
#231Well-Logging Viewer with Icons
#232Time-lapse time-domain reflectometry for tubing and formation monitoring
#233Application-Specific Integrated Circuits for Downhole Applications
#234Process for mining alluvial deposits
#235Dual mode balancing in OBM resistivity imaging
#236Formation imaging with multi-pole antennas
#237Downhole tri-axial induction electromagnetic tool
#238Electrically conductive wellbore fluids and methods of use
#239Multiaxial well logging instrument response in dipping and crossbedded formations
#240Gradient-based single well ranging system for SAGD application
#241Method for analysing pore pressure in shale formations
#242Methods of logging geological formations
#243Method and system for real time determination of formation anisotropy, dip, and strike with MCI data
#244Systems, methods, and computer medium to produce efficient, consistent, and high-confidence image-based electrofacies analysis in stratigraphic interpretations across multiple wells
#245Fracture characterization using directional electromagnetic resistivity measurements
#246Methods and apparatus to detect fluid distributions
#247Apparatus and method for temperature independent balancing of a tool
#248Method for detecting fluid fronts using a combination of electric and gravity measurements in boreholes
#249Tool for Imaging A Downhole Environment
#250System and method to improve accuracy of galvanic tool measurements
#251Tool for imaging a downhole environment
#252System and method of focusing an array laterolog
#253Downhole fluid resistivity sensor systems and methods
#254Dual mode balancing in OBM resistivity imaging
#255Full tensor micro-impedance imaging
#256System and method to measure or generate currentless electrical field downhole
#257Focused array laterolog tool
#258Induction logging sensor
#259Detecting bed boundary locations based on gradients determined from measurements from multiple tool depths in a wellbore
#260Geophysical survey node rolling method and system
#261System and method for improving surface electromagnetic surveys
#262Borehole electric field survey with improved discrimination of subsurface features
#263Shielded antenna for a downhole logging tool
#264Measurement correction apparatus, methods, and systems
#265Detecting boundary locations of multiple subsurface layers
#266Apparatus and methods of skin effect correction
#267Apparatus and Method for At-Bit Resistivity Measurements By A Toroidal Transmitter
#268METHOD OF LEAKAGE CURRENT AND BOREHOLE ENVIRONMENT CORRECTION FOR OIL BASED MUD IMAGER
#269Method and system for calibrating a downhole imaging tool
#270Advanced detector system and method using forward three-dimensional induced polarization method for TBM construction tunnel
#271Downhole salinity measurement
#272Method and apparatus for detection and quantification of borehole standoff
#273Multi-array laterolog tools and methods with split monitor electrodes
#274Methods of and apparatuses for identifying geological characteristics in boreholes
#275Systems and methodology for detecting a conductive structure
#276System and method for imaging properties of subterranean formations
#277Induced polarization mapping with borehole to surface electromagnetic transmitter data
#278Induced polarization logging with borehole to surface electromagnetic transmitter
#279Apparatus and method for balancing impedance of a resistivity measuring tool
#280System and Method for Imaging Properties of Subterranean Formations
#281Fiberoptic Systems and Methods for Subsurface EM Field Monitoring
#282Systems and methodology for detecting a conductive structure
#283Systems and methods for resistivity measurement at multiple angles of rotation
#284Method and apparatus for deep transient resistivity measurement while drilling
#285Modular resistivity logging tool systems and methods employing an adapter in an isolation joint configuration
#286Multilevel workflow method to extract resistivity anisotropy data from three-dimensional induction measurements
#287Analyzing subterranean formation with current source vectors
#288FORMATION RESISTIVITY IMAGING IN CONDUCTIVE BOREHOLES
#289System and method for generating fluid compensated downhole parameters
#290METHOD FOR PROCESSING ELECTROMAGNETIC DATA
#291SOURCE FOR ELECTROMAGNETIC SURVEYING
#292Power generating communication device
#293Apparatus and method for measuring electrical properties of an underground formation
#294System and method for measuring downhole parameters
#295Flow sensing apparatus and methods for use in oil and gas wells
#296Multi-array laterolog tools and methods
#297Multi-array laterolog tools and methods with differential voltage measurements
#298System and method for producing look-ahead profile measurements in a drilling operation
#299Method and apparatus for in-situ wellbore measurement and control with inductive connectivity
#300Method and apparatus for making resistivity measurements in a wellbore