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| Number | Title | Issue Date |
| 8188748 | Electromagnetic surveying A method of determining the nature of subterranean strata. The transmitter antenna is towed by vessel at a distance h above the sea floor. The antenna omits a wave field whose strength is proportional to the current delivered to the antenna and this is monitored. Th... | 05/29/2012 |
| 8183868 | Method to maintain towed dipole source orientation Apparatus and method for a steerable horizontal electric dipole source system for underwater deployment as a moving source in electromagnetic surveying of subsurface regions for hydrocarbons. Position locating sensors (195) are placed near each electrode (... | 05/22/2012 |
| 8030934 | Method for hydrocarbon reservoir mapping and apparatus for use when performing the method A method is proposed for a marine electromagnetic survey based on the TM mode, for the purpose of prospecting for and detecting subsurface hydrocarbon reservoirs. The method includes an electromagnetic field source (1113) that, in a submerged, essentially ver... | 10/04/2011 |
| 7825664 | Resistivity tool with selectable depths of investigation A wireline tool string used in a wellbore to determine formation properties is disclosed which comprises one or more transmitter tools disposed within the tool string, each transmitter tool having three linearly independent coils; a receiver tool disposed within the... | 11/02/2010 |
| 7812608 | Extra bucking coils to balance induction arrays An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an ... | 10/12/2010 |
| 7786733 | Apparatus and system for well placement and reservoir characterization A resistivity array having a modular design includes a transmitter module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and a receiver module with at least one antenna, wherein the... | 08/31/2010 |
| 7759940 | Mutual shielding of collocated induction coils in multi-component induction logging instruments In a multicomponent logging tool, a coil is electrically isolated by open circuiting another, substantially orthogonal coil. ... | 07/20/2010 |
| 7675289 | Underground anomalies detection vehicle and trailer A system for detection of linear underground anomalies passing under surface roads comprises an electromagnetic (EM) gradiometer mounted on a vehicle trailer. A transmitter is mounted to the front bumper of a car or vehicle towing the trailer and provides carrier sy... | 03/09/2010 |
| 7612565 | Apparatus and system for well placement and reservoir characterization A resistivity array having a modular design includes a transmitter module with at least one antenna, wherein the transmitter module has connectors on both ends adapted to connect with other downhole tools; and a receiver module with at least one antenna, wherein the... | 11/03/2009 |
| 7567084 | Method and apparatus for determining the nature of submarine reservoirs A system for investigating subterranean strata. An electromagnetic field and a seismic event are applied from the same location and the responses are detected using respective receivers both located at a second location spaced from the first. The responses are combi... | 07/28/2009 |
| 7501829 | Extra bucking coils as an alternative way to balance induction arrays An electromagnetic logging that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array in... | 03/10/2009 |
| 7443359 | 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 of a path. A magnetic field is then generated which approximates a di... | 10/28/2008 |
| 7425829 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 09/16/2008 |
| 7423432 | System and method for electromagnetic wavefield resolution A method processing an electromagnetic wavefield response in a seabed logging operation. The wavefield is resolved into upgoing- and downgoing components. The downgoing component represents reflections from the sea surface while the upgoing component represents refl... | 09/09/2008 |
| 7367269 | Blast movement monitor and method for determining the movement of a blast movement monitor and associated rock as a result of blasting operations A method for measuring the movement of boundaries between different portions of a heterogeneous rock body is disclosed. The method comprises placing a plurality of blast movement monitors 109 in a rock body prior to blasting and noting the position of each bl... | 05/06/2008 |
| 7353132 | Data acquisition system An induced polarization (IP) data acquisition system includes a plurality of linearly spaced apart measurement nodes or obtaining synchronized measurement signals indicative of the electric field strength at a corresponding plurality of spaced apart locations at or ... | 04/01/2008 |
| 7333893 | Method for spatially interpreting electromagnetic data using multiple frequencies Method for removing effects of shallow resistivity structures in electromagnetic survey data to produce a low frequency resistivity anomaly map, or alternatively imaging resistivity structures at their correct depth levels. The method involves solving Maxwell's elec... | 02/19/2008 |
| 7333897 | Method and system for identifying material composition based upon polarization trajectories A system and method for determining a most likely material composition of an object. At least one respective stored radiation polarization transformation is stored for at least one material composition at a plurality of wavelengths. A transmitted electromagnetic sig... | 02/19/2008 |
| 7330790 | Method of seismo electromagnetic detecting of hydrocarbon deposits A method of seismo electromagnetic detecting of hydrocarbon deposits has the steps of simultaneously initiating an electromagnetic field and a seismic wave in investigated geological region so that an electromagnetic signal originates by vibrating of hydrocarbon dep... | 02/12/2008 |
| 7324898 | System and method for determining a more accurate resistivity model of a geological formation using time-lapse well logging data A system and a method for estimating a model of a geological formation are provided. The geological formation has a wellbore extending therethrough. The method includes obtaining a first resistivity log associated with the geological formation from a LWD sensor in t... | 01/29/2008 |
| 7319330 | System and method for electromagnetic wavefield resolution A method of processing an electromagnetic wavefield response in a seabed logging operation. The wavefield is resolved into upgoing and downgoing components. The downgoing component represents reflections from the sea surface while the upgoing component represents re... | 01/15/2008 |
| 7317991 | Multicomponent induction measurements in cross-bedded and weak anisotropy approximation Multicomponent measurements made in a cross-bedded earth formation are processed to give one or more equivalent TI models. Resistivity information about the cross-bedding is obtained from one of the TI models and a measured cross-bedding angle. Resistivity informati... | 01/08/2008 |
| 7309982 | Portable system for rapid characterization of electrical properties of a material A material properties detection system (100). The system can include an antenna (120) that is tuned for operation within a frequency band over which the antenna transmits. The system also can include a transmitter (210) that generates electromag... | 12/18/2007 |
| 7286091 | Co-located antennas Techniques for implementing antenna configurations with substantially co-located axes are disclosed. A method for constructing co-located antennas includes winding a first antenna on a support, the first antenna having a first magnetic dipole in a first orientation;... | 10/23/2007 |
| 7279894 | Method and magnetic resonance tomography apparatus for location coding with a non-linear gradient field A nuclear magnetic resonance tomography apparatus has gradient coils that superimpose at least one gradient field on a basic magnetic field transversely to a coding direction, with an overall magnetic field in the coding direction having a magnetic field strength wi... | 10/09/2007 |
| 7271899 | Millimetre-wave detection device for discriminating between different materials A detection device that can be used for detecting objects behind clothing etc including a dielectric lens and a receive element sensitive to millimetre wave radiation. Prior art systems produce an image of a scene usually using scanning optics. This can be large and... | 09/18/2007 |
| 7262602 | Active geophysical prospecting system An active system and method for determining the physical characteristics and geological composition of subterranean formations is described. Plane polarized electromagnetic waves at specific frequencies are transmitted by a mobile transmitting antenna held stationar... | 08/28/2007 |
| 7248052 | Electric power grid induced geophysical prospecting method and apparatus A geophysical prospecting method and apparatus that utilizes the harmonics and sub harmonics waves induced into the earth by the electric power grid. The amplitude-frequency data are converted to amplitude-depth data and further converted to a differential curve. Th... | 07/24/2007 |
| 7236120 | Ultra-wideband detector systems for detecting moisture in building walls A non-destructive detection method and system enables detecting a moisture patch located inside a building wall or the like. A transmitter generates a series of ultra-wideband pulses while an ultra-wideband antenna unit, preferably in the form of an antenna array in... | 06/26/2007 |
| 7228903 | Apparatus and method for wireline imaging in nonconductive muds A pad mounted resistivity imaging device includes at least one transmitter and two or more arrays of receivers. Analysis of the received signals is done using either amplitude and phase differences between the arrays of receivers, or by analyzing amplitude and phase... | 06/12/2007 |
| 7227362 | Electric power grid induced geophysical prospecting method and apparatus An underground prospecting method and apparatus that utilizes the harmonics and fractional harmonic waves induced into the earth by the electric power grid. The data are converted to amplitude-depth and phase-depth data. The resulting data may be plotted and are com... | 06/05/2007 |
| 7219748 | Downhole signal source A signaling apparatus comprises a magnet and a shield moveable relative to the magnet. The shield is moveable relative to the magnet between a first position in which the magnet is relatively exposed and a second position in which the magnet is relatively shielded. ... | 05/22/2007 |
| 7221169 | Ultra-wide band pulse dispersion spectrometry method and apparatus providing multi-component composition analysis Embodiments cause interaction of an ultra-wide band signal with a substance over a broad range of frequencies simultaneously to obtain a response signal whose distortion is indicative of a composition of the substance. ... | 05/22/2007 |
| 7209089 | Broadband electric-magnetic antenna apparatus and method The present invention is directed to a broadband electric-magnetic antenna apparatus and method. The present invention teaches a variety of electric antennas suitable for use in the present invention as well as a variety of magnetic antennas suitable for use in the ... | 04/24/2007 |
| 7209093 | 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 of a path. A magnetic field is then generated which approximates a di... | 04/24/2007 |
| 7202669 | Method and apparatus for determining the nature of subterranean reservoirs A system for detecting or determining the nature of a subterranean reservoir. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. The measurements are taken with the antenna both in-line and pa... | 04/10/2007 |
| 7199586 | Method and apparatus for accurately measuring properties of a formation A transverse induction logging tool having a transmitter and receiver for downhole sampling of formation properties, the tool having a symmetrical shielded split-coil transmitter coil and a bucking coil interposed between the split transmitter coils to reduce coupli... | 04/03/2007 |
| 7199748 | Positioning system for data aquisition The present invention refers to a positioning system, in particular for carrying out Georadar acquisitions, and more in particular of a 3-dimension type. In one embodiment, the positioning system for data acquisition using a data acquisition system includes at least... | 04/03/2007 |
| 7190161 | Magnetic sensor A coil is operatively associated with a magnetic circuit of a vehicle body, and is adapted to cooperate with a time-varying magnetic flux in the vehicle body that is responsive to a condition of the vehicle body sensed by the magnetic sensor. An electrical circuit i... | 03/13/2007 |
| 7183771 | Multiple transmitter and receiver well logging device with error calibration system including calibration injection system A device and method for obtaining an electromagnetic propagation measurement of a subterranean geologic formation, with the formation being intersected by a borehole. The device comprises a transmitter for transmitting an electromagnetic signal, and a first and seco... | 02/27/2007 |
