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Match Document Document Title
US20130141100 ANOMALY DETECTION SYSTEM FOR WIRELINE CABLES  
An embodiment of a method for detecting an anomaly in at least a portion of a wireline cable, comprises providing at least one wireline cable, providing a wireline surface equipment system...
US20150015264 FINDING POROSITY AND OIL FRACTION BY MEANS OF DIELECTRIC SPECTROSCOPY  
Methods, systems, devices and products for evaluating an earth formation. Methods include estimating at least one property of the earth formation using at least one polarization parameter...
US20130176030 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 base...
US20120126817 DOWNHOLE SURVEYING UTILIZING MULTIPLE MEASUREMENTS  
Certain embodiments described herein provide a measure of the misalignment of multiple acceleration sensors mounted in the downhole portion of a drill string. In certain embodiments, the measure...
US20140035588 BOREHOLE PARTICLE ACCELERATOR  
Borehole tools and methods for analyzing earth formations are disclosed herein. An example borehole tool disclosed herein includes an RF particle accelerator. The particle accelerator includes at...
US20130307546 METHODS AND SYSTEMS FOR ESTIMATING FORMATION RESISTIVITY AND POROSITY  
A method for analyzing a subterranean formation porosity is disclosed. The apparent dielectric constant of the subterranean formation and an apparent resistivity of the subterranean formation are...
US20120092016 Antenna Apparatus and Method for Insulating  
In one aspect, a method for insulating an antenna apparatus is provided, the method including coupling a transition piece to a bulkhead, wherein the bulkhead includes a first conductive path...
US20110187372 Acoustic Excitation With NMR Pulse  
NMR measurements are made along with acoustic measurements using one tool. The antenna of the NMR sensor is used to create acoustic signals. Interference between the acoustic and NMR measurements...
US20130261975 Anisotropy Processing In Low Angle Wells  
A method for logging subsurface formations penetrated by a wellbore include measuring electromagnetic properties of the formations using electromagnetic fields having a magnetic dipole axis...
US20100244841 NON-PLANAR ANTENNAE FOR DIRECTIONAL RESISTIVITY LOGGING  
A downhole measurement tool includes at least one non-planar antenna configured for transmitting and/or receiving electromagnetic radiation. The non-planar antenna includes at least one non-planar...
US20110006773 EM-Guided Drilling Relative to an Existing Borehole  
Parallel drilling systems and methods suitable for drilling wells for steam-assisted gravity drainage (SAGD). In some method embodiments, a tilted-antenna tool gathers azimuthally-sensitive...
US20140176139 Basalt Fiber Composite For Antenna In Well-Logging  
A well-logging tool for a geological formation includes a housing to be positioned in a borehole and an antenna assembly carried by the housing. The antenna assembly includes an antenna housing...
US20140037065 BOREHOLE POWER AMPLIFIER  
Borehole tools and methods for analyzing earth formations are disclosed herein. An example borehole tool disclosed herein includes an RF particle accelerator. The particle accelerator includes an...
US20100052687 High Resolution Resistivity Earth Imager  
An imaging tool made includes a pad whose curvature is chosen based on the expected range of borehole radius and the pad size so as to maintain the maximum standoff below a desired value. The...
US20120293178 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...
US20080224705 Electromagnetic Probe  
An electromagnetic probe 1 measures the electromagnetic properties of a sub surface formation GF in a limited zone surrounding a well-bore hole WBH. The well-bore hole is filled with a well-bore...
US20130113487 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...
US20080252295 Detection of Borehole Effects Due to Eccentricity on Induction Instruments with Tilted Transducers  
A transverse antenna of an electromagnetic induction measurement is provided with an additional pair of split antennas. The difference in the outputs of this split antennas is indicative of a...
US20120247198 MODULAR APPARATUS AND METHOD FOR MAKING MEASUREMENTS IN BOREHOLES  
Apparatus for making measurements in boreholes comprising a sonde having a radial array of arms provided thereon; wherein the sonde is connectable to a cartridge containing electronic circuitry...
US20140285205 WELL LOGGING APPARATUS AND SYSTEM  
A system and apparatus for configuring a well logging assembly having an elongate sub with a bore therethrough, a leading end connection and a trailing end connection, a plurality of sets of...
US20140253130 Feedthrough Assembly For Well-Logging Tool  
A well-logging tool for a geological formation has a housing to be positioned within a borehole and has first and second openings. A feedthrough assembly includes an elongate electrical conductor...
US20080224706 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....
US20130239673 Systems and Methods for Collecting One or More Measurements in a Borehole  
A system and method collects at least one measurement within a borehole formed in a formation. The system and method provides a drill collar made of a non-conductive or substantially...
US20110238312 DIRECTIONAL RESISTIVITY MEASUREMENT FOR WELL PLACEMENT AND FORMATION EVALUATION  
The present disclosure relates to a method to determine a formation property of a subsurface formation. A downhole logging tool having two or more antennas, at least two of the antennas having a...
US20090302848 Apparatus and method for logging  
An apparatus for logging in a borehole comprises a longitudinal body. A pad is coupled to and radially extendable from the longitudinal body toward a wall of the borehole. The radially extendable...
US20090066334 Short Normal Electrical Measurement Using an EM-Transmitter  
A method and apparatus for determination of a formation resistivity property in which an impedance of a downhole antenna that includes an upper gap sub insulated from a lower sub is used as an...
US20130113488 APPARATUS AND METHODS FOR MONITORING A CORE DURING CORING OPERATIONS  
One method of monitoring a formation core during coring operations can include measuring resistivities of a formation internal and external to a core barrel assembly, comparing the resistivities...
US20100277176 LOGGING TOOL HAVING SHIELDED TRIAXIAL ANTENNAS  
The present invention relates to a downhole logging tool having on its tool body a set of co-located antennas, one or more additional antennas spaced longitudinally apart from the set of...
US20090015260 ANTENNA CUTOUT IN A DOWNHOLE TUBULAR  
In some embodiments, an apparatus (200) includes a tubular to operate downhole. The tubular has a longitudinal axis and has a cutout (210N) that has a direction that is other than 90 degrees to...
US20090102485 Methods for Interpreting Multi-Component Induction Logs Using the X-Signal Measurements  
Multi-component induction measurements are made using a resistivity logging tool in an anistropic earth formation. The X-signal (quadrature) is insensitive to borehole eccentricity. A subset of...
US20090295392 Resistivity Imager in Non-Conductive Mud for LWD and Wireline Applications  
An apparatus, method and computer-readable medium for imaging an earth formation. A downhole assembly having a resistivity sensor is conveyed in a borehole penetrating the earth formation. The...
US20130335092 Fracture Aperture Estimation Using Multi-Axial Induction Tool  
A method for estimating fracture aperture from multi-axial electromagnetic induction measurements made in a wellbore includes determining a fracture indicator and a fracture orientation indicator....
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...
US20100148782 RUGGED QUARTZ CLOCK  
A resonator clock suitable for use in downhole conditions is described. The resonator clock includes a resonator portion of piezoelectric material; two electrodes in electrical communication with...
US20090219028 Methods for Controlling Ion Beam and Target Voltage in a Neutron Generator for Improved Performance  
A method for operating a pulsed neutron generator includes adjusting a target current of the neutron generator to a preselected value. A parameter related to a neutron output of the neutron...
US20120234605 APPARATUS AND METHODS OF LOCATING DOWNHOLE ANOMALIES  
Various embodiments include apparatus and methods of determining the characteristics of geological formations in a well. One or more transmitters and receivers electrically imitate a moving...
US20090091327 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...
US20140368197 APPARATUS AND METHODS FOR MAKING AZIMUTHAL RESISTIVITY MEASUREMENTS  
A resistivity measuring tool used in a drillstring having a drill bit on a distal end for drilling a wellbore in a formation includes a tool body having a longitudinal axis, a sensor configured to...
US20140216818 INTERFEROMETRIC PROCESSING TO DETECT SUBTERRANEAN GEOLOGICAL BOUNDARIES  
A method of identifying a bed boundary in a subterranean formation by processing data measured by an induction logging tool. An interferometric method compares recorded voltages and/or phases...
US20100283468 Remotely located tuning circuits for multi-frequency, multi-puropse induction antennae in downhole tools  
A unified circuit without using a relay is proposed to resonate an antenna at more than two frequencies. The use of such analog IC switches are common place for transceiver applications in high RF...
US20080211507 Method and Apparatus for Gradient Electromagnetic Induction Well Logging  
The method and apparatus for determining the conductivity of anisotropic formations surrounding a borehole. The method comprises measuring the gradient of the magnetic field by an electromagnetic...
US20080061789 Telemetry apparatus and method for monitoring a borehole  
A system, method and device may be used to monitor conditions in a borehole. Energy is transmitted to a pulse generator located proximate a position to be interrogated with a sensor. The pulse...
US20110204896 DETECTING A STRUCTURE IN A WELL  
A tool for detecting a structure in a well includes a receiver coil having a first winding and a second winding, a first circuit to apply an input signal to the second winding, and a detection...
US20130335091 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...
US20080297159 Sensing Apparatus for Detecting an Interface Between First and Second Strata of Materials  
A sensing apparatus for detecting an interface between first and second materials, each have a different dielectric loss factor, disposed in a stratified manner in a volume of materials having a...
US20050189945 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....
US20140368198 Insulation Structure For Well Logging Instrument Antennas  
An antenna insulating structure for a well logging instrument includes an antenna bed disposed in a recess formed in an exterior of an instrument mandrel. A feed through port is disposed in the...
US20110234230 Azimuthal At-Bit Resistivity and Geosteering Methods and Systems  
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...
US20120081121 MULTIPLE DEPTHS OF INVESTIGATION USING TWO PAIRS OF TOROID 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...
US20110169492 NEUTRON GENERATOR  
A neutron generator includes an ion source disposed in a pressurized environment containing an ionizable gas. The ion source includes a substrate with a bundle of carbon nanotubes extending...

Matches 1 - 50 out of 75 1 2 >