Matches 51 - 100 out of 434 < 1 2 3 4 5 6 7 8 9 >


Match Document Document Title
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...
8441269 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...
8427164 Apparatus and method for reducing effects of eccentricity in induction tools  
In aspects, an apparatus for use in a wellbore for determining a property of an earth formation is provided. The apparatus, in one embodiment, may include a tool body including a transmitter...
8417455 Triaxial antenna electromagnetic measurements  
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 one of the antennas being a...
8405397 Method for mitigating leakage currents  
An apparatus and method for reducing an electric current leakage in a logging tool, particularly relating to reducing electric current leakage by altering a phase difference between a biasing...
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...
8395388 Circumferentially spaced magnetic field generating devices  
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...
8378908 Array antenna for measurement-while-drilling  
An electromagnetic antenna for Measurement-While-Drilling (MWD) applications is disclosed. The antenna can include several array elements that can act alone or together in various measurement...
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...
8374558 Antenna array with flexible interconnect for a mobile wireless device  
An antenna array can be mounted on a flexible substrate and connected by a flexible interconnect to an integrated circuit such as a radio frequency front end. The antenna array can be mounted in a...
8373418 Subsea electronic modules  
A module for use as a subsea electronic module of a subsea well, comprises an input (7) for receiving signals from a sensor arrangement which senses at least one parameter of a well, the module...
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...
8330465 Measuring head and measuring method  
A measuring head for use in electrical measurements conducted in holes drilled in the ground comprises an elongated body, adaptable in the hole and comprising an electrode, electrically connecting...
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...
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...
8294468 Method and apparatus for well-bore proximity measurement while drilling  
A rotating, transversely magnetized, magnet on a drill collar induces magnetization in a casing of a preexisting well. A coil rotating synchronously with the magnet produces a current at twice the...
8294466 Scaled plots of electromagnetic data  
Method for improving frequency-domain (1505), controlled-source electromagnetic data readability and interpretability in hydrocarbon prospecting by mapping a scaled amplitude or the relative...
8289024 Method and apparatus for locating well casings from an adjacent wellbore  
A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an...
8278928 Apparatus and method for detection of position of a component in an earth formation  
An apparatus for detecting a position of a component in an earth formation is disclosed. The apparatus includes: a transmitter configured to emit a first magnetic field into the earth formation...
8278931 Anisotropy orientation image from resistivity measurements for geosteering and formation evaluation  
A method for providing an image of a formation surrounding a wellbore, includes: obtaining an apparent conductivity curve from main components of resistivity measurements of the formation;...
8278930 Deep MWD resistivity measurements using EM shielding  
Structure for deep MWD resistivity measurements suitable for both geo-steering and measurements ahead of the drill bit is disclosed. Alternating current is transmitted through a loop and an...
8274289 Antenna coupling component measurement tool having rotating antenna configuration  
Disclosed herein are electromagnetic resistivity logging systems and methods that employ an antenna configuration having at most two transmitter or receiver antenna orientations that rotate...
8269501 Methods for magnetic imaging of geological structures  
Methods for imaging geological structures include injecting magnetic materials into the geological structures, placing at least one magnetic probe in a proximity to the geological structures,...
8264228 Method and apparatus for building a tilted antenna  
Logging tools having protected tilted antennas are disclosed, along with construction methods therefor. In one method embodiment, a tilted antenna on a retrievable segment of a downhole tool is...
8264419 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...
8248266 Bidirectional telemetry apparatus and methods for wellbore operations  
A system and method for communicating data between a downhole tool and a surface controller is provided that comprises a rotating drill string extending in a borehole and having a downhole...
8237444 Electromagnetic logging apparatus and method  
An apparatus for investigating a geological formation surrounding a borehole including a logging tool moveable through the borehole, an electromagnetic probe 1 including a pad 2 mounted on the...
8237445 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...
8222902 Modular geosteering tool assembly  
A retrievable tool for steering through an earth formation includes a first tool assembly and a tilted antenna attached to the first tool assembly. The tool also includes a second tool assembly...
8212567 Externally mounted band antennae requiring minimal metal cutting on drillstring for reduction of mechanical stresses  
An instrument disposed into a drill string for imaging an earth formation includes: at least one band antenna disposed over an intermediate layer disposed into a groove in an outer surface of the...
8198898 Downhole removable cage with circumferentially disposed instruments  
A downhole drill string component is disclosed comprising a substantially cylindrical cage with a hollow bore. An inner diameter of the cage is slideably connectable to a mandrel. A stab...
8193813 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...
8188749 Removing effects of near surface geology from surface-to-borehole electromagnetic data  
A method that involves developing an electromagnetic property model of a near surface area and using this electromagnetic property model and electromagnetic data acquired using one or more...
8174265 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...
8164339 Apparatus and system for geosteering and formation evaluation utilizing improved antennas  
An apparatus for measuring one or more earth formation properties during applications including formation evaluation and geosteering applications is provided. The apparatus includes: an elongated...
8164328 Eddy current system and method for crack detection  
An eddy current system and method enables detection of sub-surface damage in a cylindrical object. The invention incorporates a dual frequency, orthogonally wound eddy current probe mounted on a...
8159227 Methods for making directional resistivity measurements  
One exemplary embodiment of a method for making directional resistivity measurements includes transmitting an axial electromagnetic wave in a borehole and receiving substantially pure axial and...
8143906 Temperature and pressure transducer  
Methods for making and systems employing pressure and temperature sensors are described. Embodiments include a capacitive element including a first conductor plate and a second conductor plate....
8121788 Method and system to automatically correct LWD depth measurements  
A method for correcting errors in LWD depths includes performing torque and drag model analysis using drillstring weight, downhole friction, weight on bit, thermal expansion, rig heave and tide to...
8120361 Azimuthally sensitive resistivity logging tool  
Various systems and methods for implementing an azimuthally sensitive resistivity logging tool are disclosed. One such method involves transmitting a primary magnetic field from one or more coils...
8089268 Apparatus and method for removing anisotropy effect from directional resistivity measurements  
A directional resistivity tool includes at least one receiver deployed axially asymmetrically between at least one pair of transmitters. The transmitters are configured to transmit electromagnetic...
8061443 Downhole sample rate system  
In one aspect of the invention, a downhole sensor system comprises at least one downhole sensor disposed on or within a downhole component of a tool string. The downhole sensor is adapted to...
8049507 Transient EM for geosteering and LWD/wireline formation evaluation  
A transmitter on an instrument is used to induce currents in an earth formation when it is turned on or off. A Fourier transform is applied to transient measurements made in the receivers. A...
8049508 Method and apparatus for determining formation boundary near the bit for conductive mud  
A method and apparatus for determining a parameter of interest of an earth formation during drilling of a borehole. A first toroidal coil antenna induces a current along a path that includes a...
8049506 Wired pipe with wireless joint transceiver  
A wireless transceiver for transmitting data across a pipe joint is described herein. At least some illustrative embodiments include a wireless communication apparatus including a housing...
8036830 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...
8030935 Minimizing the effect of borehole current in tensor induction logging tools  
Logging tools, methods, and computer programs for use in borehole logging are described. The logging tool includes three or more tensors, each tensor including one or more coils. Each coil is...
8030936 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...

Matches 51 - 100 out of 434 < 1 2 3 4 5 6 7 8 9 >