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| Number | Title | Issue Date |
| 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 electromagnetic transmitters located above the near surface area and one or m... | 05/29/2012 |
| 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 the longitudinal axis of the tubular. The apparatus also i... | 05/08/2012 |
| 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 transverse components of the wave. A ratio of the axial and transverse c... | 04/17/2012 |
| 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 placed on a drill collar and receiving several electrical signals, whe... | 02/21/2012 |
| 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 multifrequency focusing of the transformed data is used for applications li... | 11/01/2011 |
| 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 characterized by coil parameters including an axis orientation, a cross-se... | 10/04/2011 |
| 7994790 | Electromagnetic and magnetostatic shield to perform measurements ahead of the drill bit A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A pair of receivers on the BHA receive signals that are indicative of formation resistivity and distances to bed boundaries. A time dependen... | 08/09/2011 |
| 7990153 | Compensated directional resistivity measurements A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially pure axial and transverse components of each of the transmitted waves. A... | 08/02/2011 |
| 7973532 | Downhole spread spectrum induction instruments A plurality of transmitters on a logging tool are activated simultaneously at substantially the same frequency. When the transmitter outputs are phase-modulated using a mutually orthogonal set of modulating functions, it is possible to recover, from the signal at ea... | 07/05/2011 |
| 7952358 | Methods and apparatus for determination of a formation resistivity property using eccentered 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 the multi-component measurements are inverted to first determine horizon... | 05/31/2011 |
| 7852087 | 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 electromagnetic transmitters located above the near surface area and one or m... | 12/14/2010 |
| 7839148 | Method and system for calibrating downhole tools for drift A method and related system calibrating downhole tools for drift. Some of the illustrative embodiments are a logging tool comprising a tool body, a transmitter antenna associated with the tool body, a transmitter electronics coupled to the transmitter antenna, a fir... | 11/23/2010 |
| 7795872 | Determining correction factors representing effects of different portions of a lining structure To determine effect on a magnetic field caused by a lining structure in a wellbore, an array may be deployed into the wellbore lined with the lining structure. The array comprises a plurality of sensors including sensor A configured to operate as a transmitter, sens... | 09/14/2010 |
| 7746076 | Method for imaging subterranean formations A method for using a tool in a wellbore in a formation to predict an anomaly in the formation ahead of the device, the tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. the met... | 06/29/2010 |
| 7723991 | Apparatus and method for azimuthal MWD resistivity imaging at multiple depths of investigation A combination of a shallow-reading and a deep-reading, azimuthally sensitive, multiple propagation devices is used for providing depth images the earth formation with different depth of investigation. It is emphasized that this abstract is provided to comply with th... | 05/25/2010 |
| 7719282 | Method and apparatus for mulit-component induction instrument measuring system for geosteering and formation resistivity data interpretation in horizontal, vertical and deviated wells An improved induction tool for evaluating formation resistivity. The tool provides electromagnetic transmitters and sensors suitable for transmitting and receiving magnetic fields in radial directions that are orthogonal to the tool's longitudinal axis with minimal ... | 05/18/2010 |
| 7714585 | 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. ... | 05/11/2010 |
| 7692428 | Retrievable formation resistivity tool Systems and methods for downhole communication and measurement utilizing an improved metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a run-in tool. The tubular including slotted stations to provide through-tubular s... | 04/06/2010 |
| 7659723 | Broadband resistivity interpretation Resistivity measurements are made at a plurality of frequencies. An asymptotic high-frequency limit is determined and the electrical efficiency is estimated as a ratio of the high frequency resistivity limit to the low frequency resistivity. From the electrical effi... | 02/09/2010 |
| 7652478 | Cross-component alignment measurement and calibration A multicomponent induction logging tool is positioned within an alignment loop and the transmitter is activated at a number of rotation angles of the tool. Misalignment between the transmitter and receiver coils can be determined from the induced signals in the rece... | 01/26/2010 |
| 7609065 | System and method for locating an anomaly A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes... | 10/27/2009 |
| 7583085 | Downhole sensor assembly In one aspect of the invention, a sensor assembly for incorporation into a downhole tool string comprises at least one sensor adapted to detect changes in magnetic flux proximate a first portion of the downhole tool string. A second portion of the downhole tool stri... | 09/01/2009 |
| 7579840 | Broadband resistivity interpretation Resistivity measurements are made at a plurality of frequencies. An asymptotic high-frequency limit is determined and the electrical efficiency is estimated as a ratio of the high frequency resistivity limit to the low frequency resistivity. From the electrical effi... | 08/25/2009 |
| 7557581 | Method for imaging subterranean formations A method of imaging a subterranean formation traversed by a wellbore using a tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. The tool is brought to a first position inside th... | 07/07/2009 |
| 7538555 | System and method for locating an anomaly ahead of a drill bit A method and a system are provided for allowing determination of a distance from a tool to anomaly ahead of the tool. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes transmitti... | 05/26/2009 |
| 7495446 | Formation evaluation system and method A formation evaluation system for a subterranean formation penetrated by a wellbore. The formation evaluation system is provided with a downhole tool and a sensor. The downhole tool is positionable in the wellbore. The downhole tool has a downhole electromagnetic un... | 02/24/2009 |
| 7482812 | Series-resonant tuning of an LWD receiver A loop antenna useful, for example, in investigation of earth formations. Embodiments of the invention provide a loop antenna circuit comprising a loop antenna disposed to generate, in response to an electromagnetic wave, a pick-up signal on an output node. Loop ant... | 01/27/2009 |
| 7436183 | Replaceable antennas for wellbore apparatus An antenna structure is separately and independently formed with respect to a downhole tool. The antenna is adapted for easy and rapid deployment on the tool. An independently formed ‘partial ring section’ (or arcuate shaped member) contains an antenna coil. In ... | 10/14/2008 |
| 7436184 | Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically conductive tool body. An AC voltage supply is coupled to the tool bod... | 10/14/2008 |
| 7437251 | Correction of sensor non-equipotentiality in a resistivity imaging device A method for correcting data from at least one sensor electrode in a sensor includes determining a potential difference (V) between two electrodes; from the potential difference (V), determining a by-pass current (Ic) for the at least one sensor electrode... | 10/14/2008 |
| 7425830 | System and method for locating an anomaly A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes... | 09/16/2008 |
| 7425831 | System and method for locating an anomaly A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes... | 09/16/2008 |
| 7420367 | High-frequency induction imager with concentric coils for MWD and wireline applications An induction logging tool having concentric transmitter and receiver antennas can be used to make measurements of earth formations at frequencies up to 500 MHz. The antennas may be mounted on the mandrel of a bottomhole assembly for MWD applications, or may be pad m... | 09/02/2008 |
| 7417436 | Selectable tap induction coil An electromagnetic logging tool includes a support configured for disposal in a well; at least one antenna mounted on the support; and a plurality of coils mounted on the support proximate the at least one antenna, wherein the plurality of the coils are configured f... | 08/26/2008 |
| 7414406 | System and method for locating an anomaly A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes... | 08/19/2008 |
| 7414405 | Measurement tool for obtaining tool face on a rotating drill collar An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field sensor deployed in a tool body. The apparatus further includes a prog... | 08/19/2008 |
| 7414407 | Method and apparatus for directional resistivity measurement while drilling A resistivity tool has a body with at lest one pair of grooves on its exterior oriented orthogonal to the tool axis. A coil antenna is oriented orthogonal to the grooves in a hole intersecting the grooves and oriented orthogonal to the tool axis. The antenna and an ... | 08/19/2008 |
| 7403000 | Apparatus and method of determining casing thickness and permeability A casing inspection device with magnets and flux sensors. The sensors provide measurements of absolute levels of magnetic flux that are indicative of changes in casing thickness and/or permeability. ... | 07/22/2008 |
| 7403013 | Boring tool tracking/guiding system and method with unconstrained target location geometry Tracking a boring tool is performed within an underground region using a locating signal. The boring tool is moved through the ground during a series of distance movements such that potential movement of the boring tool during any one of the distance movements is le... | 07/22/2008 |
| 7391216 | Locating arrangement and method using boring tool and cable locating signals An arrangement and an associated method are described in which a boring tool is moved through the ground within a given region along a path in which region a cable is buried. The boring tool and the cable transmit a boring tool locating signal and a cable locating s... | 06/24/2008 |
