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Match Document Document Title
9043153 Maximum depth of investigation of measurements in a formation  
The present disclosure relates to a method to determine a volume of clearance surrounding a wellbore. A logging tool is provided. The logging tool may be disposed on a wireline, a drill string, or...
9035657 Electromagnetic logging between a cased borehole and surface  
The present disclosure relates to systems and methods for conducting an electromagnetic borehole-to-surface survey of a formation surrounding a borehole. Such methods include deploying a dipole...
9008986 Variable tool calibration  
The present disclosure relates to a method to calibrate logging measurements from a logging tool for which one or more attributes vary over the course of logging. A logging tool is provided and a...
8957683 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...
8941385 Enhanced method of sensing ionization current in spark ignition internal combustion engines and related spark plug structures  
A spark plug, including an insulator embedding a first metallic electrode axially extending therethrough from a high voltage outer end terminal to the center of the inner end of the insulator from...
8922215 Measurement of formation parameters using rotating directional EM antenna  
A logging tool and method to make subsurface measurements is disclosed, wherein the tool is placed within a borehole penetrating a formation. The tool has a transmitter antenna and a receiver...
8917094 Method and apparatus for detecting deep conductive pipe  
Downhole tools and techniques acquire information regarding nearby conductors such as pipes, well casing, and conductive formations. At least some method embodiments provide a current flow along a...
8890541 Method and apparatus for calibrating deep-reading multi-component induction tools with minimal ground effects  
An apparatus and method for calibrating a multi-component induction logging tool. The method may include orienting a Z-transmitter coil to be substantially orthogonal to at least one Z-receiver...
8890531 Systems and methods having pot core 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...
8854045 Electronics for a thin bed array induction logging system  
A logging tool electronics system is disclosed (FIG. 1) with noise minimization features and pulse compression signal processing techniques to improve the signal-to-noise ratio of array induction...
8836335 Multi-capacitor system for electromagnetic logging tool  
An apparatus for estimating a property of an earth formation penetrated by a borehole includes: a borehole carrier; a first switchable-magnet; a first energy storage device coupled to the first...
8829908 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...
8816689 Apparatus and method for multi-component wellbore electric field Measurements using capacitive sensors  
A method and apparatus is provided for collecting reservoir data. The method includes providing one or more electromagnetic sources for generating an electromagnetic field in a reservoir and...
8786287 Collocated tri-axial induction sensors with segmented horizontal coils  
A logging tool for use in a borehole to obtain multicomponent resistivity induction measurements using collocated coils wherein each of the transverse antennas comprises a pair of mirror-image...
8762107 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...
8754651 System and method for imaging properties of subterranean formations  
A system and method for imaging properties of subterranean formations in a wellbore is provided. The system comprises a formation sensor for collecting currents injected into the subterranean...
8754650 Detection of 3D formation structures based on electro-magnetic 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...
8710846 Electromagnetic probe for measuring properties of a subsurface formation  
A probe for measuring electromagnetic properties of a subsurface formation includes a pad having a face adapted for engagement with a borehole wall, a pair of transmitting antennas, and two pairs...
8704523 Measuring casing attenuation coefficient for electro-magnetics measurements  
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...
8694259 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 including induction voltage measurements obtained from a tool...
8664958 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...
8638103 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...
8614577 Automatic anisotropy, azimuth and dip determination from upscaled image log data  
A method of determining anisotropy in a borehole is disclosed. An array of measurements along the borehole is obtained and a first depth in the borehole is selected. An arbitrary plane oriented...
8593147 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...
8558548 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...
8527205 Gravity interpretation workflow in injection wells  
A method comprising: estimating a change in a characteristic of a subterranean formation into which a fluid has been injected via a well extending into the subterranean formation; building a...
8497673 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....
8487625 Performing downhole measurement using tuned transmitters and untuned receivers  
An apparatus configured to evaluate an earth formation that includes a tuned transmitter antenna and an untuned broadband receiver antenna. The transmitter antenna being configured to generate...
8471562 Multi-axial antenna and method for use in downhole tools  
Embodiments of a multi-axial antenna system and system for measuring subsurface formations are generally described herein. Other embodiments may be described and claimed. In some embodiments, the...
8466683 Determining properties of earth formations using the electromagnetic coupling tensor  
A system and method to determine earth formation properties by positioning a logging tool within a wellbore in the earth formation, the logging tool having a tool rotation axis and a first, a...
8466682 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...
8456166 Single-well through casing induction logging tool  
Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation through a conductive casing of a borehole. A number of transmitters/receivers are...
8441261 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...
8436618 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...
8433518 Multilevel workflow method to extract resistivity anisotropy data from 3D induction measurements  
A method is provided for determining formation resistivity, anisotropy and dip from wellbore measurements includes moving a well logging instrument through subsurface formations. The instrument...
8432167 Method and apparatus of using magnetic material with residual magnetization in transient electromagnetic measurement  
A transmitter antenna assembly for transient electromagnetic well logging instrument comprises an antenna coil coupled with a current source and a magnetic core having residual magnetization....
8400158 Imaging in oil-based mud by synchronizing phases of currents injected into a formation  
Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole. The apparatus includes a carrier configured to be conveyed through the borehole. A first...
8400160 Combined propagation and lateral resistivity downhole tool  
A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna...
8400159 Casing correction in non-magnetic casing by the measurement of the impedance of a transmitter or receiver  
Methods and related systems are described for determining the casing attenuation factor for various frequencies from measurements of the impedance of the transmitting or receiving coil of wire of....
8378684 Method for determining fluid type in reservoir  
A method for determining a formation type within a wellbore includes forming the wellbore such that the wellbore intersects fractures within a formation. Hydrocarbons are produced from the...
8362780 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...
8360146 Method for reservoir fracture and cross beds detection using tri-axial/multi-component resistivity anisotropy measurements  
The invention is a method for inverting reservoir bi-axial anisotropy and identifying complicated fracture/cross-bedding system (104) by using tri-axial induction logs and wellbore survey/image...
8356673 Down-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  
A down-hole tool provided with a transmitter system for inducing a transient electromagnetic field in an earth formation has an induction coil with a number of windings to generate essentially a...
8354846 Method and apparatus for reducing effect of tool eccentricity in a borehole on multi-axial induction measurements  
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...
8332152 Method and apparatus for eliminating drill effect in pulse induction measurements  
A method and apparatus provide a time-dependent calibration to essentially eliminate pipe effect in pulse-induction logging while drilling. Use of two receivers to provide calibration and...
8332191 Correction factors for electromagnetic measurements made through conductive material  
The present disclosure relates to determining attenuation factors relating to an electromagnetic signal passing through, a conductive material seen by a real sensor. A sensor is provided and...
8330463 Protection of a multidirectional antenna  
The disclosure provides an apparatus and method for estimating one or more formation properties downhole. The apparatus includes a tool body that has a longitudinal axis. The tool body has a...
8310239 Detecting electrical current in a magnetic structure  
A current sensor measures an electrical current flowing in well casing or other magnetic structure. The current sensor can be installed in a tool for performing electromagnetic (EM) induction...
8305081 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...
8299795 Independently excitable resistivity units  
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...

Matches 1 - 50 out of 430 1 2 3 4 5 6 7 8 9 >