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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...
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...
8941384 Reliable wired-pipe data transmission system  
A high-frequency data and/or power transmission system suitable for downhole use including signal/power couplers, transmission line segments and signal repeaters. Signals and power are/is...
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...
8901932 Tool for imaging a downhole environment  
The invention is concerned with a tool and method for imaging a formation through a substantially non-conductive medium. The tool comprises first circuitry for injecting a current into the...
8901931 Electromagnetic surface-to-borehole look around systems and methods of monitoring in horizontal wells  
A method for water monitoring about a deviated well is disclosed. The method includes positioning a series of electromagnetic (EM) receivers in a completed deviated wellbore, said receivers being...
8901933 Tool for imaging a downhole environment  
The invention is concerned with a tool and method for determining a downhole parameter. The tool is located in mud surrounded by a formation and comprising a first electrode spaced at a distance...
8884623 Methods for determining dielectric permittivity spectrum of underground rock formations  
A method for determining the frequency-dependent dielectric permittivity spectrum of a rock sample, comprising:—defining a series of electromagnetic measurement data comprising at least a first...
8860416 Downhole sensing in borehole environments  
A drill string can include at least one transmit antenna and at least one receive antenna. The transmit antenna transmits at least one electromagnetic signal into a region of an earth formation....
8854044 Instrumented core barrels and methods of monitoring a core while the core is being cut  
A formation core analysis system can include an inner barrel and a toroidal electromagnetic antenna which transmits electromagnetic signals into a formation core when the core is received in the...
8847600 Use of autotransformer-like antennas for downhole applications  
An apparatus for estimating a property of an earth formation penetrated by a borehole, apparatus including: a carrier configured to be conveyed through the borehole; a transducer disposed at the...
8838389 Polar display for use with drilling tools  
Various techniques for generating a polar display include a method, which involves receiving information identifying a formation property of an anomaly within a geologic formation from a...
8829907 Frequency filtering and adjustment of electromagnetically received signals from antennas  
An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the...
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...
8803527 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....
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...
8760167 Apparatus and method for balancing impedance of a resistivity measuring tool  
Techniques related to making resistivity measurements of an underground formation surrounding a borehole involve using a tool having a pad mounted on the body of the tool. The pad has a current...
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...
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...
8749242 System and method for employing alternating regions of magnetic and non-magnetic casing in magnetic ranging applications  
A system and methods for facilitating drilling and/or drilling a well in an orientation with respect to an existing well are provided. Specifically, one method in accordance with present...
8749243 Real time determination of casing location and distance with tilted antenna measurement  
Methods and apparatus for detecting nearby conductors such as pipes, well casing, etc., from within a borehole. A nearby casing string can be detected by transmitting an electromagnetic signal...
8736271 Method and apparatus for measuring resistivity of formations  
An apparatus for determining the resistivity of formation surrounding a borehole comprising: an elongate conductive body;a pair of transmitter antennas comprising first and second antennas mounted...
8736270 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...
8718942 Systems and methods for investigating a formation surrounding a borehole  
A method, a system, and an apparatus are described for the data acquisition in the well-logging of a borehole wall during the investigation of formation properties. Data acquisition is conducted...
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...
8686917 Locating technique and apparatus using an approximated dipole signal  
Location determination is performed using a transmitter including an elongated generally planar loop antenna defining an elongation axis. The elongation axis is positioned along at least a portion...
8680866 Borehole to surface electromagnetic transmitter  
An electromagnetic energy transmitter is provided for borehole to surface electromagnetic (BSEM) surveying. The transmitter is lowered into a well borehole to a desired location in a well borehole...
8680865 Single well reservoir imaging apparatus and methods  
An apparatus and related methods are described for detecting features of a reservoir surrounding a borehole, the apparatus being capable of emitting an electromagnetic wave signal and receiving a...
8669765 Estimating a parameter of interest with transverse receiver toroid  
An apparatus and method for estimating a parameter of interest of an earth formation. An apparatus includes an elongated support member; a primary transmitter on the elongated support member; and...
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...
8648760 Continuous dipole antenna  
A dipole antenna may be created by surrounding a portion of the continuous conductor with a nonconductive magnetic bead, and then applying a power source to the continuous conductor across the...
8638104 Method for determining spatial distribution of fluid injected into subsurface rock formations  
A method for determining spatial distribution of fluid injected into a subsurface rock formation includes injecting the fluid into the rock formation. The fluid includes therein electrically...
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...
8600115 Borehole image reconstruction using inversion and tool spatial sensitivity functions  
A method for reconstructing a borehole image includes determining a spatial sensitivity function for a borehole imaging tool and using the imaging tool to obtain a borehole image of a subterranean...
8598895 System and method to measure dielectric constant in a subterranean well  
A method and system to predict dielectric behavior in a wide frequency range in a wellbore. The method comprising: deploying a tool in a wellbore, measuring the permittivity and conductivity at...
8581592 Downhole methods and assemblies employing an at-bit antenna  
Logging tools and methods employing an at-bit loop antenna to acquire azimuthal resistivity measurements proximate to the bit enable low-latency geosteering signals to be generated. In some...
8575936 Packer fluid and system and method for remote sensing  
A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy operable to transmit an electromagnetic signal in...
8570044 Providing measurements to enable determination of electrical resistivity anisotropy of a subterranean structure  
To analyze content of a subterranean structure, electric field measurements at plural source-receiver azimuths in a predefined range are received. Total magnetic field measurements are also...
8571797 Determining borehole corrected formation on properties  
A method to determine one or more borehole corrected formation properties using measurements made using a logging tool disposed in a borehole penetrating an earth formation is disclosed. The...
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...
8547103 Multiple depths of investigation using two transmitters  
An apparatus and method for estimating a parameter of interest of an earth formation, particularly relating to borehole logging methods and apparatuses for estimating electrical resistivity...
8536871 Method of correcting resistivity measurements for toll bending effects  
A method for correcting subterranean resistivity measurements to account for tool bending includes processing at least one coupling component and at least one cross-coupling component in...
8536883 Method of measuring a multiphase flow  
A method of measuring the permittivity and/or conductivity of a multiphase fluid flowing through a conduit is provided. The method includes the steps of measuring the signal from a first...
8513947 Detection of tool in pipe  
Methods and systems for determining whether a tool has been deployed below a drill pipe are provided. A downhole tool can measure various characteristics, which then can be analyzed to determine...
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...
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...

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