Method of Correcting Imaging Data For Standoff and Borehole Rugosity

Method for estimating formation dip using combined multiaxial induction and formation image measurements

Robust inversion systems and methods for azimuthally sensitive resistivity logging tools

Single-well through casing induction logging tool

Detecting electrical current in a magnetic structure

Method of measuring and imaging RXO (near wellbore resistivity) using transient EM

Method of determining saturations in a reservoir

Resistivity logging with reduced dip artifacts

Method of deep resistivity transient measurement while drilling

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Oscillator sensor for determining a property of an earth formation

Azimuthally sensitive resistivity logging tool

Tool for azimuthal resistivity measurement and bed boundary detection

Deep MWD resistivity measurements using EM shielding

Transient EM for geosteering and LWD/wireline formation evaluation

Seismic measurement system including GPS receivers

Externally guided and directed field induction resistivity tool

Casing correction in non-magnetic casing by the measurement of the impedance of a transmitter or receiver

Method and apparatus for while-drilling transient resistivity measurements

Flux plane locating in an underground drilling system

Method of enhancing attributes of logs of geological formations

Method for borehole correction, formation dip and azimuth determination and resistivity determination using multiaxial induction measurements

Apparatus and method for estimating eccentricity effects in resistivity measurements

Magnetic field deflector in an induction resistivity tool

Processing of azimuthal resistivity data in a resistivity gradient

Method for eliminating borehole eccentricity effect in transversal induction sensor

Extra bucking coils to balance induction arrays

Anisotropy orientation image from resistivity measurements for geosteering and formation evaluation

Using multicomponent induction data to identify drilling induced fractures while drilling

Method and apparatus for building a tilted antenna

Modular geosteering tool assembly

Octupole induction sensors for resistivity imaging in non-conductive muds

Resistivity imager in non-conductive mud for LWD and wireline applications

Characterizing at least one property of a liner that lines a well

Systems and methods having pot core antennas for electromagnetic resistivity logging

Method of finite-element discretization in heterogeneous and highly conductive grid cells

Simultaneous inversion of induction data for dielectric permittivity and electric conductivity

Method for compensating drill pipe and near-borehole effect on and electronic noise in transient resistivity measurements

Methods of logging geological formations

Method and apparatus for eliminating drill effect in pulse induction measurements

Electromagnetic and magnetostatic shield to perform measurements ahead of the drill bit

Method for imaging subterranean formations

Methods of logging geological formations

Antenna coupling component measurement tool having rotating antenna configuration

Downhole spread spectrum induction instruments

Electromagnetic wave resistivity tool having a tilted antenna for determining properties of earth formations

Electromagnetic imaging method and device

Characterization of fracture length and formation resistivity from array induction data

Determining structural dip and azimuth from LWD resistivity measurements in anisotropic formations

Downhole removable cage with circumferentially disposed instruments

Multi-component resistivity logging tool with multiple antennas using common antenna grooves

Method of and apparatus for measuring tensor resistivity

Antennas for deep induction array tools with increased sensitivities

Induction resistivity cover

Independently excitable resistivity units

Resistivity receiver spacing

Downhole induction resistivity tool

Method and apparatus for electromagnetic logging of a formation

Method and apparatus for imaging bed boundaries using azimuthal propagation resistivity measurements

Methods and apparatus for determination of a formation resistivity property using eccentered measurements

Determining correction factors representing effects of different portions of a lining structure

Apparatus and method for azimuthal MWD resistivity imaging at multiple depths of investigation

Apparatus and Method for Electrically Investigating a Borehole

Assisted Seismic Measuring System Including GPS Receivers

Geosteering in earth formations using multicomponent induction measurements

Determining formation parameters using electromagnetic coupling components

Assisted Seismic Measuring System Including GPS Receivers

Borehole conductivity simulator verification and transverse coil balancing

Method of calibrating an azimuthal inductive cross-coil or tilted coil instrument

Apparatus and system for well placement and reservoir characterization

Method and apparatus for determining formation boundary near the bit for conductive mud

Borehole conductivity simulator verification and transverse antenna balancing

Selectable tap induction coil

Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations

EXTRA BUCKING COILS AS AN ALTERNATIVE WAY TO BALANCE INDUCTION ARRAYS

Induction tool for detail evaluation of near borehole zone

Externally guided and directed halbach array field induction resistivity tool

Externally guided and directed field induction resistivity tool

Externally guided and directed field induction resistivity tool

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Method and apparatus for detecting borehole effects due to eccentricity of induction instruments

Mutual shielding of collocated induction coils in multi-component induction logging instruments

Array antenna for measurement-while-drilling

Use of Electrodes and Multi-Frequency Focusing to Correct Eccentricity and Misalignment Effects on Transversal Induction Measurements

Processing of multi-component induction measurements in a biaxially anisotropic formation

Method and apparatus for gradient electromagnetic induction well logging

Borehole Conductivity Simulator Verification and Transverse Coil Balancing

Method and apparatus for use of the real component of a magnetic field of multicomponent resistivity measurements

Determining properties of earth formations using the electromagnetic coupling tensor

Apparatus and system for well placement and reservoir characterization

Method for determining an effective formation conductivity for induction log borehole correction

Method and apparatus for reducing borehole and eccentricity effects in multicomponent induction logging

Method of generating a deep resistivity image in LWD measurements

Increasing the resolution of electromagnetic tools for resistivity evaluations in near borehole zones

Method for azimuthal resistivity measurement and bed boundary detection

Resistivity tools with collocated antennas

Correction of misalignment of antennas in a logging tool

Correction of misalignment of antennas in a downhole logging tool

Flux plane locating in an underground drilling system

Correction of multi-component measurements for tool eccentricity in deviated wells

Method and apparatus for making multi-component measurements in deviated wells

Correction of Cross-Component Induction Measurements for Misalignment Using Comparison of the XY Formation Response

Seismic measuring system including GPS receivers

Method and apparatus for correcting underestimation of formation anisotropy ratio

Use of multi-component measurements in delineating geology of deep-water sediments

Method and apparatus for mulit-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells

METHOD OF ANALYZING A SUBTERRANEAN FORMATION AND METHOD OF PRODUCING A MINERAL HYDROCARBON FLUID FROM THE FORMATION

METHOD OF FORMATION CHARACTERICATION USING TOOL RESPONSES

Correction of cross-component induction measurements for misalignment using comparison of the XY formation response

Correction of cross-component induction measurements for misalignment using comparison of the XY formation response

Method and apparatus for the use of multicomponent induction tool for geosteering and formation resistivity data interpretation in horizontal wells

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Processing of multi-component induction data in the presence of borehole abnormalities

Magnetic head for conductivity imaging for use in boreholes

Geosteering in earth formations using multicomponent induction measurements

Apparatus and method for resistivity measurements during rotational drilling

Electromagnetic and Magnetostatic Shield To Perform Measurements Ahead of the Drill Bit

ASSISTED SEISMIC MEASURING SYSTEM INCLUDING GPS RECEIVERS

Geosteering in earth formations using multicomponent induction measurements

Real time data quality control and determination of formation angles from multicomponent induction measurements using neural networks

Method and apparatus for internal calibration in induction logging instruments

Assisted seismic measuring system including GPS receivers

Borehole conductivity simulator verification and transverse coil balancing

Resistivity tool with selectable depths of investigation

Method and apparatus for detecting overpressured zone ahead of a drill bit using resistivity and seismic measurements

Calibration of XX, YY and ZZ induction tool measurements

METHOD AND SYSTEM FOR DETERMINING AN ELECTROMAGNETIC RESPONSE FROM AN EARTH FORMATION AND METHOD OF DRILLING A BOREHOLE

Cross-component alignment measurement and calibration

Flux plane locating in an underground drilling system

Apparatus and method for guiding energy in a subsurface electromagnetic measuring system

Compensation for tool disposition in LWD resistivity measurements

Method of generating a deep resistivity image in LWD measurements

Seismic measuring system including GPS receivers

Elimination of the anisotropy effect in LWD azimuthal resistivity tool data

Anti-symmetrized electromagnetic measurements

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Calibration of xx, yy and zz induction tool measurements

Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion

Magnetic sensing assembly for measuring time varying magnetic fields of geological formations

Method for measuring transient electromagnetic components to perform deep geosteering while drilling

Extra bucking coils as an alternative way to balance induction arrays

Selectable tap induction coil

Well placement by use of differences in electrical anisotropy of different layers

Method and apparatus for directional resistivity measurement while drilling

Borehole conductivity simulator verification and transverse coil balancing

Multicomponent induction measurements in cross-bedded and weak anisotropy approximation

Induction resistivity imaging principles and devices in oil based mud

Two loop calibrator

Method for determining borehole corrections for well-logging tools

Method for signal enhancement in azimuthal propagation resistivity while drilling

Insulated sleeve with conductive electrodes to reduce borehole effects for an induction tool

High-frequency induction imager with concentric coils for MWD and wireline applications

Multiscale multidimensional well log data inversion and deep formation imaging method

Minimizing the effect of borehole current in tensor induction logging tools

Method and apparatus for measuring mud resistivity

Method for imaging subterranean formations

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Apparatus and system for well placement and reservoir characterization

Geosteering in anisotropic formations using multicomponent induction measurements

Geosteering in anisotropic formations using multicomponent induction measurements

Determination of formation anistrophy, dip and azimuth

Determination of fracture orientation and length using multi-component and multi-array induction data

System and method for correcting induction logging device measurements by alternately estimating geometry and conductivity parameters

Compact magnetic sensor for multi-component induction and micro-resistivity measurements

Flux plane locating in an underground drilling system

Method and apparatus of using magnetic material with residual magnetization in transient electromagnetic measurement

Method of eliminating conductive drill parasitic influence on the measurements of transient electromagnetic components in MWD tools

System, apparatus, and method for conducting electromagnetic induction surveys

Insulated sleeve with conductive electrodes to reduce borehole effects for an induction tool

Method for determining sonde error for an induction or propagation tool with transverse or triaxial arrays

Method for measuring transient electromagnetic components to perform deep geosteering while drilling

Directional electromagnetic wave resistivity apparatus and method

Method and apparatus for use of the real component of a magnetic field of multicomponent resistivity measurements

Apparatus and method for addressing borehole eccentricity effects

Determining formation anisotropy based in part on lateral current flow measurements

Method and apparatus for minimizing direct coupling for downhole logging devices

System and method for locating an anomaly ahead of a drill bit

Apparatus and methods for determining isotropic and anisotropic formation resistivity in the presence of invasion

Induction measurements with reduced borehole effects

Semi-conductive shell for sources and sensors

Method for characterizing a subsurface formation with a logging instrument disposed in a borehole penetrating the formation

Methods and systems for estimating formation resistivity that are less sensitive to skin effects, shoulder-bed effects and formation dips

Real time processing of multicomponent induction tool data in highly deviated and horizontal wells

Deep resistivity transient method for MWD applications using asymptotic filtering

Induction logging system and method featuring multi-frequency skin effect correction

Seismic measuring system including GPS receivers

Multi-frequency focusing for MWD resistivity tools

Apparatus and methods for reducing borehole current effects

Method and apparatus for internal calibration in induction logging instruments

Electromagnetic wave resistivity tool

Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone

Apparatus and method for resistivity measurements during rotational drilling

Method for attenuating conductive sonde mandrel effects in an electromagnetic induction well logging apparatus

Short-offset transient electromagnetic transmission system

Enhanced look ahead prediction

Detecting underground utilities

Dynamic diameter measurement device for downhole wireline cables

Data transmission system

Systems, methods, and apparatuses for downhole lateral detection using electromagnetic sensors

Retrievable downhole cable antenna for an electromagnetic system