Matches 1 - 50 out of 157 1 2 3 4 >


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US20120025834 DETERMINING ANISOTROPIC RESISTIVITY  
The present disclosure relates to a method to determine the vertical resistivity of a subsurface formation. A downhole logging tool having a plurality of spaced antennas, at least one of which is...
US20130126240 METHOD FOR SALT AND CROSS-BED PROXIMITY DETECTION USING DEEP DIRECTIONAL ELECTROMAGNETIC MEASUREMENTS WHILE DRILLING  
A method for drilling a wellbore proximate a salt structure includes measuring formation resistivity azimuthally. A map of spatial distribution of resistivity is determined from the azimuthal...
US20120001637 CORRECTING FOR MAGNETIC INTERFERENCE IN AZIMUTHAL TOOL MEASUREMENTS  
Methods and systems that compensate for magnetic interference in azimuthal tool measurements. At least some method embodiments include a downhole logging method that includes taking measurements...
US20110199088 Electromagnetic Wave Resistivity Tool Having A Tilted Antenna For Determining The Horizontal And Vertical Resistivities And Relative Dip Angle In Anisotropic Earth Formations  
This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth...
US20110221443 High Frequency Dielectric Measurement Tool  
Disclosed dielectric logging tools and methods employ three or more receive horn antennas positioned between at least two transmit antennas, which can also be horn antennas. The logging tools can...
US20120283951 METHODS AND SYSTEMS FOR DETERMINING FORMATION PARAMETERS USING A ROTATING TOOL EQUIPPED WITH TILTED ANTENNA LOOPS  
Methods and systems for characterizing a formation are disclosed. A tool is placed in the formation. The tool comprises a perpendicular antenna set and a parallel antenna set. The perpendicular...
US20110001481 Borehole Effect Reduction in Multi-Axial Induction  
An apparatus, method and computer-readable medium are provided for estimating a resistivity property of an earth formation. A logging tool includes a first antenna arrangement and a second antenna...
US20120138291 SUBTERRANEAN FORMATION DEFORMATION MONITORING SYSTEMS  
Method, devices and systems are provided for measuring deformation in subterranean formations. Such methods include introduction of spaced-apart depth magnetic markers along the longitudinal...
US20100071794 ELECTRICALLY NON-CONDUCTIVE SLEEVE FOR USE IN WELLBORE INSTRUMENTATION  
A well logging instrument housing includes an electrically non-conductive tube and at least one layer of fiber embedded in a matrix surrounding an exterior of the tube. The at least one fiber...
US20120078558 Triaxial Induction Calibration Without Prior Knowledge of the Calibration Area's Ground Conductivity  
Disclosed is a method for determining calibration factors of an induction tool that includes three receiver coils, each having a distinct orientation. The method includes: placing the induction...
US20110074427 Directional Resistivity Antenna Shield  
A logging while drilling tool includes a directional resistivity antenna and an antenna shield having. The shield has at least one slot having at least one electrically open end formed therein....
US20100127708 Resistivity Logging with Reduced Dip Artifacts  
Systems and methods are disclosed for reducing boundary-related artifacts in logs taken from resistivity logging tools. Such tools often exhibit “horns” at boundaries between formation beds having...
US20130141103 Induction Coil Impedance Modeling Using Equivalent Circuit Parameters  
Methods and related systems are described for making an electromagnetic induction survey of a formation surrounding a cased section of a borehole. An electromagnetic transmitter and/or receiver is...
US20150035536 DETECTING BOUNDARY LOCATIONS OF MULTIPLE SUBSURFACE LAYERS  
Systems, methods, and software for detecting boundary locations of multiple subsurface layers are described. In some aspects, the boundaries of multiple subsurface layers in a subterranean region...
US20110012602 Cancellation of Vibration Noise in Deep Transient Resistivity Measurements While Drilling  
A transient electromagnetic (TEM) signal is recorded in an earth formation during vibration of a logging tool. Concurrently, accelerometer measurements are made. The accelerometer measurements are...
US20150153474 MULTI -AXIAL INDUCTION BOREHOLE IMAGER  
Various systems and methods are disclosed for implementing and using a multi-axial induction borehole imaging tool that includes emitters that induce, at azimuthally-spaced positions on a borehole...
US20110074428 Apparatus and Method for Downhole Electromagnetic Measurement While Drilling  
A directional resistivity tool includes a pair of transmitters deployed between at least one pair of receivers. Each of the transmitters and receivers preferably includes collocated z-mode and...
US20110254552 METHOD AND APPARATUS FOR DETERMINING GEOLOGICAL STRUCTURAL DIP USING MULTIAXIAL INDUCTION MEASUREMENTS  
A method for determining structural dip of subsurface formations includes accepting as input multiaxial induction measurements made by passing electric current through a multiaxial transmitter...
US20100156424 Robust Inversion Systems and Methods for Azimuthally Sensitive Resistivity Logging Tools  
Methods and systems for determining the horizontal resistivity, vertical resistivity, and relative dip angle of anisotropic earth formations. Some of the disclosed methods and systems measure...
US20090278543 Systems and Methods Having Radially Offset Antennas for Electromagnetic Resistivity Logging  
Disclosed herein are electromagnetic resistivity logging systems and methods that employ magnetic dipole antennas embedded in wall-contacting surfaces. In some embodiments, the antennas are...
US20150015265 Look Ahead Logging System  
A technique utilizes the acquisition of data from desired subterranean regions via a logging system. The logging system is constructed for use in a wellbore and comprises a transmitter module...
US20110050233 VIBRATING HELICAL SPRING SENSORS AND METHODS TO OPERATE THE SAME  
Example vibrating helical spring sensors and methods to operate the same are disclosed. A disclosed example apparatus includes a housing, a helical spring held in tension, a flowline to expose the...
US20100212902 CONDUCTIVE CEMENT FORMULATION AND APPLICATION FOR USE IN WELL  
Method for cementing a well comprising a hydraulic cement, water, carbon fiber and graphite are provided. The synergy achieved from combining fibers and particulates into the same sample results...
US20110316542 SLOTTED SHIELD FOR LOGGING-WHILE-DRILLING TOOL  
An LWD tool with a tubular having a longitudinal axis and a set of co-located antennas carried in a recess on the tubular is disclosed. The tool carries a shield having an open slot configuration...
US20110309834 DETERMINATION OF CONDUCTIVE FORMATION ORIENTATION BY MAKING WELLBORE SONDE ERROR CORRECTION  
A method for determining orientation of an electrically conductive formation proximate an electrically substantially non-conductive formation includes measuring multiaxial electromagnetic...
US20100176812 LOOK-AHEAD BOUNDARY DETECTION AND DISTANCE MEASUREMENT  
Systems and methods for look-ahead boundary detection and distance estimation are disclosed. In some embodiments, a drilling method includes extending a borehole with a drill string that includes...
US20090309601 ELECTROMAGNETIC LOGGING APPARATUS AND METHOD  
An apparatus for investigating a geological formation GF surrounding a borehole WB, comprises a logging tool TL moveable through the borehole, an electromagnetic probe 1 comprising a pad 2 mounted...
US20080246486 Mutual Shielding of Collocated Induction Coils in Multi-Component Induction Logging Instruments  
In a multicomponent logging tool, a coil is electrically isolated by open circuiting another, substantially orthogonal coil.
US20090160448 Induction Resistivity Cover  
A downhole induction resistivity assembly that comprises a downhole tool string component. The tool string component comprises an induction transmitter. The transmitter is adapted to induce an...
US20150115965 Induction Logging Sensor  
Apparatuses and methods are provided herein that may improve sensitivity to transient signals. For example, an electromagnetic sensor for downhole measurements that includes a plurality of sectors...
US20090281731 Characterizing at Least One Property of a Liner that Lines a Well  
Impedances of an electromagnetic (EM) coil positioned in a well lined with an electrically conductive liner are determined. The impedances correspond to plural frequencies of operation of the EM...
US20100176813 ANTENNA OF AN ELECTROMAGNETIC PROBE FOR INVESTIGATING GEOLOGICAL FORMATIONS  
An antenna (3) of an electromagnetic probe used in investigation of geological formations GF surrounding a borehole WBH comprises a conductive base (31) and an antenna element (32). The conductive...
US20100283490 DETERMINING FORMATION PROPERTIES WHILE DRILLING  
The present disclosure relates to a method to determine a characteristic of a subsurface formation using a downhole logging tool. A downhole logging tool having the ability to make substantially...
US20100052689 Magnetic Field Deflector in an Induction Resistivity Tool  
A downhole induction resistivity assembly comprises a mandrel. Disposed around the mandrel are coils of wire disposed circumferentially around magnetic field concentrators. The coils of wire and...
US20150160367 Determination and Display of Apparent Resistivity of Downhole Transient Electromagnetic Data  
Systems, devices, and methods for evaluating an earth formation. Methods may include inducing a current in the formation; measuring a time-dependent transient electromagnetic (TEM) signal induced...
US20090295393 Octupole Induction Sensors for Resistivity Imaging in Non-Conductive Muds  
The present disclosure provides a method and apparatus for performing resistivity measurements of a borehole wall using a transverse octupole sensor. The sensor may be a resistivity sensor. Higher...
US20100097065 Method and apparatus for while-drilling transient resistivity measurements  
Structure for deep MWD resistivity measurements suitable for both geo-steering and measurements ahead of the drill bit is disclosed. The structure is capable of extracting information about...
US20100123461 OSCILLATOR SENSOR FOR DETERMINING A PROPERTY OF AN EARTH FORMATION  
An apparatus for evaluating an earth formation, the apparatus including: a logging tool configured to be conveyed through a borehole penetrating the earth formation; a coil inductively coupled to...
US20150061682 Shielded Antenna For A Downhole Logging Tool  
A downhole logging tool includes a tool body having a co-located set of antennas located on the tool body and first and second antennas formed from respective first and second pairs of coil...
US20120169344 USE OF ELECTRODES AND MULTI-FREQUENCY FOCUSING TO CORRECT ECCENTRICITY AND MISALIGNMENT EFFECTS ON TRANSVERSAL INDUCTION MEASUREMENTS  
A multicomponent induction logging tool uses a nonconducting mandrel. A central conducting member including wires that electrically connect at least one of the antennas to another of the antennas....
US20090248308 SIMULTANEOUS INVERSION OF INDUCTION DATA FOR DIELECTRIC PERMITTIVITY AND ELECTRIC CONDUCTIVITY  
A method of inverting induction logging data for evaluating the properties of underground formations surrounding a borehole, the data comprising induction voltage measurements obtained from a tool...
US20100231221 Induction Coil Impedance Modeling using Equivalent Circuit Parameters  
Methods and related systems are described for making an electromagnetic induction survey of a formation surrounding a cased section of a borehole. An electromagnetic transmitter and/or receiver is...
US20060214664 OBM sensor with a loop antenna  
A method and apparatus for downhole resistivity imaging uses an antenna coupled to a power source through a directional coupler. Measured reflectivity values are indicative of the antenna...
US20140285206 BUCKING CIRCUIT FOR ANNULLING A MAGNETIC FIELD  
A method and apparatus is provided for bucking a magnetic field of known geometry and time variation by means of a plurality of bucking loops. It utilizes multiple loops, each of which is...
US20110068797 LOGGING TOOL WITH INDEPENDENTLY ENERGIZABLE TRANSMITTERS  
A downhole induction resistivity assembly that comprises a downhole tool string component. The tool string component comprises an induction transmitter. The transmitter is adapted to induce an...
US20140218037 Intelligent Spectral Induced Polarization Measurement Module  
A system for spectral induced polarization measurement of a formation is provided. The system provides an intelligent module to be utilized in performing spectral induced polarization (SIP)...
US20110215809 DETECTION OF FORMATION STRUCTURES USING ELECTROMAGNETIC COUPLING MEASUREMENTS  
The present disclosure relates to a method to determine a characteristic of a subsurface formation using electromagnetic coupling components. A downhole logging tool having one or more...
US20080315883 Method of Calibrating an Azimuthal Inductive Cross-Coil or Tilted Coil Instrument  
A phase error in measurements made by a resistivity logging tool is estimated by positioning the tool above a conducting surface. Deviation of the measured phase difference between the transmitter...
US20080231283 Multi-Frequency Cancellation of Dielectric Effect  
Measurements made with an induction logging tool are responsive to formation conductivity and permittivity. The effect of permittivity can be substantially removed by multifrequency focusing.
US20100259267 ELECTROMAGNETIC LOGGING BETWEEN BOREHOLE AND SURFACE  
The present disclosure relates to determining a property, such as resistivity, of an earth formation. A transmitter is disposed in a wellbore penetrating the formation, and a plurality of...

Matches 1 - 50 out of 157 1 2 3 4 >