173338 ⎘
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
Resistivity imaging using combination capacitive and inductive sensors
#302Casing Coupler Mounted EM Transducers
#303Inductive downhole sensor with center tap for common mode rejection
#304Optimizing eddy current measurement to save power
#305Magnetic Induction Sensor with an Electro-Optical Transducer and Related Methods and Systems
#306Method for estimating reservoir fluid characteristics in laminated media
#307Semi-rigid airborne electromagnetic transmitter antenna system
#308Using an array of sensors between two transmitters in an eddy current logging environment
#309Modular system for geosteering and formation evaluation
#310Laterolog array tool for performing galvanic measurement
#311System and method for a bonded differential magnetic sensor array using pulsed eddy current for cased-hole applications
#312Flux plane locating in an underground drilling system
#313Determining a full electromagnetic coupling tensor using multiple antennas
#314Casing collar locator
#315Systems and methods for relative dip correction
#316Casing string monitoring using electromagnetic (EM) corrosion detection tool and junction effects correction
#317Tracker With Electronic Compass And Method Of Use
#318Corkscrew effect reduction on borehole induction measurements
#319Tool for azimuthal resistivity measurement and bed boundary detection
#320Systems, methods, and apparatuses for downhole lateral detection using electromagnetic sensors
#321Gradient induction logging tool having direct field cancelation with optional compensation
#322Fiberoptic tuned-induction sensors for downhole use
#323High gain antenna for propagation logging tools
#324Cross-coupling compensation via complex-plane based extrapolation of frequency dependent measurements
#325Fracture detection method using multi-axial induction tool
#326Apparatus and method for aligning downhole measurements
#327Method for formation fracture characterization in highly inclined wells using multiaxial induction well logging instruments
#328Finding combined hydrocarbon fraction and porosity by means of dielectric spectroscopy
#329Enhanced formation evaluation using high-frequency dielectric and array induction tools
#330Casing defect determination using stored defect response information
#331Fracture detection and characterization using resistivity images
#332Multifrequency processing to determine formation properties
#333Apparatus for well logging capable of forward investigation
#334Resistivity logging tools with tilted ferrite elements for azimuthal sensitivity
#335Multi-step borehole correction scheme for multi-component induction tools
#336High directionality galvanic and induction well logging tools with metamaterial focusing
#337Method and tool for directional electromagnetic well logging
#338Apparatus and method of processing multi-component induction data
#339Electromagnetic formation evaluation tool apparatus and method
#340Rotatable sensors for measuring characteristics of subterranean formation
#341Interwell tomography methods and systems employing a casing segment with at least one transmission crossover arrangement
#342Determination of formation dip/azimuth with multicomponent induction data
#343Steerable magnetic dipole antenna for measurement while drilling applications
#344Shielding device for improving dynamic range of electromagnetic measurements
#345Method and apparatus for determining formation properties using non-directional electromagnetic measurements in high angle or horizontal wells
#346Methods and apparatuses to generate a formation model
#347Downhole detection tool
#348Evaluation tool for concentric wellbore casings
#349Apparatus and method for simultaneously obtaining quantitative measurements of formation resistivity and permittivity in both water and oil based mud
#350Method for determining triaxial conductivity with arbitrary orientation using multiaxial electromagnetic measurements
#351MULTI-COMPONENT INDUCTION LOGGING METHODS AND SYSTEMS HAVING A TREND-BASED DATA QUALITY INDICATOR
#352Downhole gradiometric ranging utilizing transmitters and receivers having magnetic dipoles
#353Gain compensated tensor propagation measurements using collocated antennas
#354Reducing or preventing dissipation of electrical current and associated magnetic signal in a wellbore
#355Apparatus, methods and systems for downhole testing of electronic equipment
#356Triaxial antenna array having four saddle coils between two axial coils
#357Methods and systems of electromagnetic interferometry for downhole environments
#358Focused symmetric pipe inspection tools
#359Multi-frequency electromagnetic tensor measurements
#360Drilling wells in compartmentalized reservoirs
#361Measuring fluid conductivity
#362Hybrid image of earth formation based on transient electromagnetc measurements
#363Flux plane locating in an underground drilling system
#364Electromagnetic ranging source suitable for use in a drill string
#365Systems and methods for determining dielectric constant or resistivity from electromagnetic propagation measurement using contraction mapping
#366Surface calibration of a wellbore resistivity logging tool
#367Imaging of wellbore pipes using deep azimuthal antennas
#368Holographic techniques for corrosion evaluation of wellbore pipes
#369Systems and methods for casing detection using resonant structures
#370Petrophysically-consistent calibration of full-tensor electromagnetic induction tools
#371Inversion Technique For Fracture Characterization In Highly Inclined Wells Using Multiaxial Induction Measurements
#372Apparatus and methods for making azimuthal resistivity measurements
#373Reconfigurable well logging system
#374Downhole device having a toroidal coil with flat metallic strip
#375Use of transverse antenna measurements for casing and pipe detection
#376Multi-component induction logging systems and methods using blended-model inversion
#377Antenna of an electromagnetic probe for investigating geological formations
#378Optimized production via geological mapping
#379Directional antennas for electromagnetic mapping in a borehole
#380Homogeneous inversion for multi-component induction tools
#381Electromagnetic sensing apparatus for borehole acoustics
#382ESTIMATING SUBSURFACE FORMATION AND INVASION PROPERTIES
#383Measurement compensation using multiple electromagnetic transmitters
#384Restorable antennae apparatus and system for well logging
#385Method and device for multi-sensor electromagnetic defectoscopy of well casings
#386Electromagnetic telemetry for measurement and logging while drilling and magnetic ranging between wellbores
#387Identifying unconventional formations
#388Method of estimating anisotropic formation resistivity profile using a multi-component induction tool
#389Extended 1D inversion of electromagnetic measurements for formation evaluation
#390Log processing and fracture characterization in biaxially anisotropic formations
#391Systems and methods for active cancellation of transient signals and dynamic loop configuration
#392Ferrofluid tool for enhancing magnetic fields in a wellbore
#393ESTIMATING PETROPHYSICAL PARAMETERS AND INVASION PROFILE USING JOINT INDUCTION AND PRESSURE DATA INVERSION APPROACH
#394Antenna coupling component measurement tool having a rotating antenna configuration
#395TARGET WELL RANGING METHOD, APPARATUS, AND SYSTEM
#396Apparatus and methods of reducing error in measurements
#397Fast formation dip angle estimation systems and methods
#398Methods and systems for an integrated acoustic and induction logging tool
#399Dip correction using estimated formation layer resistivities
#400Detector
#401Methods and apparatus for wellbore evaluation
#402Estimation of three-dimensional formation using multi-component induction tools
#403Calibration resistivity tools in environments with radio-frequency noise
#404Dip correction for array induction tool data
#405Electromagnetic time-lapse remote sensing of reservoir conditions
#406Apparatus and methods for geosteering
#407DOWNHOLE TOOL WITH RADIAL ARRAY OF CONFORMABLE SENSORS FOR DOWNHOLE DETECTION AND IMAGING
#408Magnetic ranging to an AC source while rotating
#409Magnetic ranging while rotating
#410Apparatus and methods to find a position in an underground formation
#411Methods and systems for determining formation parameters using a rotating tool equipped with tilted antenna loops
#412Downhole ranging from multiple boreholes
#413Deep azimuthal system with multi-pole sensors
#414Telemetry system, current sensor, and related methods for a drilling system
#415Time-frequency domain multiplexing apparatus, methods, and systems
#416Systems and methods for performing ranging measurements using third well referencing
#417Use of a fractal antenna in array dielectric logging
#418Dipole locator using multiple measurement points
#419Tilted antenna logging systems and methods yielding robust measurement signals
#420Method and apparatus for optimizing deep resistivity measurements with multi-component antennas
#421Inversion-based calibration of downhole electromagnetic tools
#422Formation imaging with multi-pole antennas
#423Apparatus and methods to find a position in an underground formation
#424Resistivity of chemically stimulated reservoirs
#425Apparatus and method for downhole resistivity measurements
#426Dip correction in invaded zones
#427Hold-up tool with conformable sensors for highly-deviated or horizontal wells
#428Downhole tri-axial induction electromagnetic tool
#429Gain compensated directional propagation measurements
#430Gain compensated directional propagation measurements
#431Gain compensated directional propagation measurements
#432Reducing conductive casing effect in transient cased-hole resistivity logging
#433Multiaxial well logging instrument response in dipping and crossbedded formations
#434METHOD AND APPARATUS FOR DETERMINING FORMATION PROPERTIES USING COLLOCATED TRIAXIAL ANTENNAS WITH NON-PLANAR SINUSOIDAL COILS
#435Methods of logging geological formations
#436Method and system for real time determination of formation anisotropy, dip, and strike with MCI data
#437Non-contact fluid resistivity measurement
#438System, method and computer-program product for in-situ calibration of a wellbore resistivity logging tool
#439Transient electromagnetic tool mounted on reduced conductivity tubular
#440Methods and apparatus to acquire compensated signals for determination of formation parameters
#441Remote field testing using a permeable core
#442Reliable wired-pipe data transmission system
#443Calibration method for multi-component induction tools
#444Determination and display of apparent resistivity of downhole transient electromagnetic data
#445Full tensor micro-impedance imaging
#446Multi-axial induction borehole imager
#447Induction type broadband 3-component borehole magnetic measuring sensor and borehole electromagnetic tomography method using the same
#448Casing mounted EM transducers having a soft magnetic layer
#449Dipole Locator Using Multiple Measurement Points
#450Shielded antenna for a downhole logging tool
#451Methods and devices for extra-deep azimuthal resistivity measurements
#452Term by term gain calibration of triaxial propagation measurements
#453Look ahead logging system
#454Electronics for a thin bed array induction logging system
#455Methods and systems for joint seismic and electromagnetic data recording
#456Adaptive inversion for vertical resistivity logs from multiaxial induction measurements
#457Apparatus and methods for communicating downhole data
#458Systems and methods for downhole magnetic field measurement
#459Systems and methods for downhole electric field measurement
#460Modular resistivity sensor for downhole measurement while drilling
#461Sensing characteristics in a subterranean earth formation
#462Apparatus and methods for making azimuthal resistivity measurements
#463Enhanced resistivity measurement with at-bit resistivity sensor
#464Magnetic sensing apparatus having a helmholtz coil
#465Multi-component induction logging systems and methods using real-time OBM borehole correction
#466Method and tool for directional electromagnetic well logging
#467Antenna, tool, and methods for directional electromagnetic well logging
#468Bucking circuit for annulling a magnetic field
#469Well logging apparatus and system
#470Feedthrough assembly for well-logging tool
#471Feedthrough assembly for electrically conductive winding
#472Look-ahead of the bit applications
#473Subterranean formation oil mobility quicklook
#474Intelligent spectral induced polarization measurement module
#475Interferometric processing to detect subterranean geological boundaries
#476Induced polarization mapping with borehole to surface electromagnetic transmitter data
#477Induced polarization logging with borehole to surface electromagnetic transmitter
#478Systems and methods for investigating a formation surrounding a borehole
#479Modular resistivity logging tool systems and methods employing an adapter in an isolation joint configuration
#480Cross-coupling based determination of anisotropic formation properties
#481Coil winding methods for downhole logging tools
#482Flux plane locating in an underground drilling system
#483Multilevel workflow method to extract resistivity anisotropy data from three-dimensional induction measurements
#484Apparatus and method for downhole transient resistivity measurement and inversion
#485Apparatus and Method for Formation Dielectric Constant and Resistivity Measurements
#486Apparatus and methods for well-bore proximity measurement while drilling
#487Method for estimating formation parameters from imaginary components of measured data
#488Drill bit for performing electromagnetic measurements in a subterranean formation
#489Detection system of geological formations
#490Multicomponent borehole radar systems and methods
#491METHOD OF PREDICTING THE RESPONSE OF AN INDUCTION LOGGING TOOL
#492Finding oil viscosity and surface tension by means of dielectric spectroscopy
#493Electronics for a thin bed array induction logging system
#494APPARATUS WITH RIGID SUPPORT AND RELATED METHODS
#495Apparatus and method for well logging and data processing device
#496Fracture aperture estimation using multi-axial induction tool
#497Multi-capacitor system for electromagnetic logging tool
#498Direct coupling cancellation with a combination of sensor tilt angles
#499Misalignment compensation for deep reading azimuthal propagation resistivity
#500Method and apparatus to detect formation boundaries ahead of the bit using multiple toroidal coils
#501Signal processing methods for steering to an underground target
#502Anisotropy processing in low angle wells
#503Induction logging signals and directional guidance antenna systems
#504Induction logging signals using complex waveforms and directional guidance antenna systems
#505Multi-array laterolog tools and methods with differential voltage measurements
#506Apparatus and method for microresistivity imaging in which transmitter coil and receiver coil axes are substantially perpendicular to the longitudinal axis of the tool body
#507Bending correction for deep reading azimuthal propagation resistivity
#508Gain-corrected measurements
#509Antenna of an electromagnetic probe for investigating geological formations
#510Magnetic ranging tool and method
#511Method and apparatus for downhole measurement tools
#512Shielded antenna for a downhole logging tool
#513Induction coil impedance modeling using equivalent circuit parameters
#514Instrumented core barrels and methods of monitoring a core while the core is being cut
#515Measuring the phase of received signals
#516SYSTEM AND METHOD FOR DETERMINING INFORMATION RELATED TO SUB-SURFACE GEOLOGICAL FORMATIONS USING TIME-DEPENDENT MAGNETIC FIELDS
#517Integrated dip from 3D resistivity tool and borehole imaging tool
#518Multi-step borehole correction scheme for multi-component induction tools
#519Apparatus and methods of controlling recordation of resistivity-related readings in determining formation resistivity
#520Efficient inversion systems and methods for directionally-sensitive resistivity logging tools
#521Method and apparatus for calibrating deep-reading multi-component induction tools with minimal ground effects
#522METHOD AND APPARATUS FOR CORRECTING TEMPERATURE EFFECTS FOR AZIMUTHAL DIRECTIONAL RESISTIVITY TOOLS
#523Imaging using directional resistivity measurements
#524Inductive downhole tool having multilayer transmitter and receiver and related methods
#525Antenna coupling component measurement tool having a rotating antenna configuration
#526Apparatus and method for multi-component wellbore electric field Measurements using capacitive sensors
#527Systems and methods for investigating a formation surrounding a borehole
#528Determining formation parameters using electromagnetic coupling components
#529Methods and systems for determining formation parameters using a rotating tool equipped with tilted antenna loops
#530Borehole to surface electromagnetic transmitter
#531MEASUREMENT OF INVASION DEPTH WHILE DRILLING UTILIZING STREAMING POTENTIAL
#532Modular geosteering tool assembly
#533Correction of Deep Azimuthal Resistivity Measurements for Bending
#534Method for detecting formation resistivity outside of metal casing using time-domain electromagnetic pulse in well
#535Azimuthally sensitive resistivity logging tool
#536Dipole locator using multiple measurement points
#537Inversion-Based Method to Correct for the Pipe Residual Signal in Transient MWD Measurements
#538Processing and geosteering with a rotating tool
#539Reliable wired-pipe data transmission system
#540Use of electrodes and multi-frequency focusing to correct eccentricity and misalignment effects on transversal induction measurements
#541Triaxial antenna electromagnetic measurements
#542Simultaneous inversion of induction data for dielectric permittivity and electric conductivity
#543Combinations of axial and saddle coils to create the equivalent of tilted coils for directional resistivity measurements
#544Real-time fracture detection and fracture orientation estimation using tri-axial induction measurements
#545DTEM with short spacing for deep, ahead of the drill bit measurements
#546Electromagnetic surface-to-borehole look around systems and methods of monitoring in horizontal wells
#547Use of autotransformer-like antennas for downhole applications
#548Remotely located tuning circuits for multi-frequency, multi-purpose induction antennae in downhole tools
#549Determining anisotropic resistivity
#550Correcting for magnetic interference in azimuthal tool measurements
#551Determination of conductive formation orientation by making wellbore sonde error correction
#552Determining resistivity anisotropy and formation structure for vertical wellbore sections
#553Surface to borehole electromagnetic surveying using metallic well casings as electrodes
#554Downhole sensing in borehole environments
#555Method and apparatus for measuring resistivity of formations
#556Method and apparatus for gradient electromagnetic induction well logging
#557Three-coil system with short nonconductive inserts for transient MWD resistivity measurements
#558METHOD AND APPARATUS FOR DETERMINING GEOLOGICAL STRUCTURAL DIP USING MULTIAXIAL INDUCTION MEASUREMENTS
#559Apparatus and system for well placement and reservoir characterization
#560Multilevel workflow method to extract resistivity anisotropy data from 3D induction measurements
#561Induction Resistivity Tool that Generates Directed Induced Fields
#562Single well reservoir imaging apparatus and methods
#563Estimating a parameter of interest with transverse receiver toroid
#564DETECTING A STRUCTURE IN A WELL
#565Electromagnetic Wave Resistivity Tool Having A Tilted Antenna For Determining The Horizontal And Vertical Resistivities And Relative Dip Angle In Anisotropic Earth Formations
#566Flux plane locating in an underground drilling system
#567Determining properties of earth formations using the electromagnetic coupling tensor
#568Look ahead logging system
#569Noise canceling in-situ NMR detection
#570Steerable magnetic dipole antenna for measurement while drilling applications
#571TRANSMITTER SYSTEM, METHOD OF INDUCING A TRANSIENT ELECTROMAGNETIC FIELD IN AN EARTH FORMATION, METHOD OF OBTAINING A TRANSIENT ELECTROMAGNETIC RESPONSE SIGNAL, AND METHOD OF PRODUCING A HYDROCARBON FLUID
#572Directional resistivity antenna shield
#573METHOD OF DETERMINING A TRANSIENT ELECTROMAGNETIC RESPONSE OF A FORMATION
#574Imaging using directional resistivity measurements
#575Logging tool with independently energizable transmitters
#576Drilling wells in compartmentalized reservoirs
#577Down-hole transmitter system, method of inducing a transient electromagnetic field in an earth formation, method of obtaining a transient electromagnetic response signal, and method of producing a hydrocarbon fluid
#578Correction factors for electromagnetic measurements made through conductive material
#579Cancellation of vibration noise in deep transient resistivity measurements while drilling
#580Apparatus and method for reducing effects of eccentricity in induction tools
#581Method and apparatus for reducing effect of tool eccentricity in a borehole on multi-axial induction measurements
#582Attenuation of electromagnetic signals passing through conductive material
#583Apparatus and system for well placement and reservoir characterization
#584Determining Correction Factors Representing Effects of Different Portions of a Lining Structure
#585Downhole Resistivity Receiver with Canceling Element
#586Remotely located tuning circuits for multi-frequency, multi-puropse induction antennae in downhole tools
#587Logging tool having shielded triaxial antennas
#588Borehole Transient EM System for Reservoir Monitoring
#589Electromagnetic logging between a cased borehole and surface
#590Method for determining fluid type in reservoir
#591Flux plane locating in an underground drilling system
#592Performing downhole measurement using tuned transmitters and untuned receivers
#593Apparatus and method for removing anisotropy effect from directional resistivity measurements
#594Non-planar antennae for directional resistivity logging
#595Induction coil impedance modeling using equivalent circuit parameters
#596Method for reservoir fracture and cross beds detection using tri-axial/multi-component resistivity anisotropy measurements
#597Collocated tri-axial induction sensors with segmented horizontal coils
#598METHOD FOR ACCENTUATING SIGNAL FROM AHEAD OF THE BIT
#599Method and system to estimate fracture aperture in horizontal wells
#600Estimating petrophysical parameters and invasion profile using joint induction and pressure data inversion approach