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| Number | Title | Issue Date |
| 8008920 | Method and apparatus for utilizing time division multiple waveform transmitting A method and apparatus of constructing a signal for a controlled source electromagnetic survey is described. In one embodiment, a method is described that includes determining a first waveform and a second waveform, the first waveform and second waveform related to ... | 08/30/2011 |
| 7940050 | System and method for measuring resistivity of an earth formation with correction for mud electrical properties A method for measuring a resistivity parameter of an earth formation is provided. The method includes: conveying a measurement current from at least one measurement electrode into the formation, the at least one measurement electrode having a potential; receiving th... | 05/10/2011 |
| 7855560 | Analog front-end coherent in-phase demodulation data acquisition system for resistivity image tools A method and system for measuring formation resisitivity is achieved by introducing an electrical signal into the formation. The current of the introduced electrical signal is then sensed, producing an analog voltage signal as a measurement of the formation. The int... | 12/21/2010 |
| 7427863 | Method and system for calculating resistivity of an earth formation Method and system for calculating resistivity of an earth formation. At least some of the illustrative embodiments are methods comprising transmitting a current from a first current source, receiving at least part of the current at a first current return, said first... | 09/23/2008 |
| 7397250 | High resolution resistivity earth imager Phase-sensitive measurements are made by a resistivity imaging tool in a borehole having non-conductive mud in a conductive earth formation at a plurality of frequencies. From the phase sensitive measurements, the formation resistivity can be determined with higher ... | 07/08/2008 |
| 7394258 | High resolution resistivity earth imager Impedance measurements made by a galvanic resistivity tool in a borehole in an earth formation are corrected by a factor that depends on the mud conductivity and the mud dielectric constant. Standoff measurements are not necessary. ... | 07/01/2008 |
| 7385401 | High resolution resistivity earth imager Measurements made by a resistivity imaging tool in a borehole having non-conductive mud in a conductive earth formation are corrected using the tool standoff. The correction involves removing a calibration signal determined in a medium of high conductivity from the ... | 06/10/2008 |
| 7362102 | Electromagnetic surveying for resistive or conductive bodies A method of analyzing electromagnetic survey data from an area of seafloor 6 that is thought or known to contain a resistive or conductive body, for example a subterranean hydrocarbon reservoir 12, is described. The method includes providing horizontal... | 04/22/2008 |
| 7309850 | Measurement of current-voltage characteristic curves of solar cells and solar modules A solar cell or solar module is measured during a short pulse of light in such a way that the resulting data for current and voltage at each light intensity is the same as would be measured under steady-state illumination conditions and therefore predictive of the a... | 12/18/2007 |
| 7270177 | Instrumented packer A technique that is usable with a subterranean well includes communicating a fluid into a region of the well and monitoring a level of the fluid communicated via a downhole sensor. The communication is controlled in response to the monitoring. ... | 09/18/2007 |
| 7259564 | Method and device for determining the position of an interface in relation to a bore hole The invention concerns a method for determining the position, in a formation (1) containing at least one electrolytic liquid, of an interface (6) in relation to a bore hole (2). One stimulates at a first instant the interface (6) with an ... | 08/21/2007 |
| 7256574 | Device for measuring electric current intensity A magnetic field generated by a primary winding (1) in which the current (i1) to be measured flows is balanced by a magnetic field of opposing direction generated by a secondary winding (2) in which a compensating current (i2) flo... | 08/14/2007 |
| 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 |
| 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 |
| 7212016 | Apparatus and methods for measuring resistance of conductive layers Apparatus and methods for measuring the electrical resistance of conductive materials are disclosed. In one embodiment, an apparatus includes a housing, and first, second, third, and fourth conductive members projecting outwardly from the housing. The conductive mem... | 05/01/2007 |
| 7158048 | Identically programmed intelligent electrodes for use in geoelectrical surveys Apparatus for conducting geophysical surveys comprising a multiplicity of intelligent electrodes provided on a multi-conductor cable, for receiving a command signal in response to which predetermined electrodes are connected to selected conductors in the cable. Each... | 01/02/2007 |
| 7151377 | Permanent apparatus for monitoring a well by injecting current through the casing into the formations Apparatus for monitoring an underground formation through which a borehole passes, comprises a conductive casing (6) located in the borehole (1) passing through the formation (4); a plurality of sensors (12-1) for measuring an elec... | 12/19/2006 |
| 7132831 | Electrode configuration for resistivity sounding Device for resistivity soundings on water covered subsurfaces including a Fixed Current Asymmetric Schlumberger electrode configuration with a first and second current electrode and a number of voltage electrodes that are positioned on one line between the current e... | 11/07/2006 |
| 7109716 | Soil and time modeling for improved electromagnetic locators for underground utilities A method for locating an object buried in soil in which at least one electromagnetic signal is imparted onto the buried object, thereby generating an electromagnetic field around the buried object. The electromagnetic field as well as at least one electromagnetic pr... | 09/19/2006 |
| 7109718 | Underground exploration apparatus A current to be applied to a ground is defined as the sum of two sinusoidal waves having first and second frequency components. A signal to be used at the time of synchronous detection is defined as a difference between the sinusoidal waves having the first and seco... | 09/19/2006 |
| 7098664 | Multi-mode oil base mud imager A multi-mode oil base mud imager for use in non-conductive drilling fluid includes at least one current source—a current return pair, and one or more monitor electrodes not located between the current source and the current return of the current source-current ret... | 08/29/2006 |
| 7098806 | Traffic preemption system A traffic preemption system is described that includes onboard equipment located on a vehicle and a fleet management center in communication with the onboard equipment. The fleet management center is also in communication with a traffic management center that is in ... | 08/29/2006 |
| 7064551 | Process for determining the resistivity of a formation through which a well equipped with a casing passes Process for determining the resistivity (Rt) of a formation (9) surrounding a well (10) equipped with a casing (11) consisting of several casing segments (11.i, 11.s) with an overlapping part (1), and cement ( | 06/20/2006 |
| 7034539 | Underground exploration apparatus, system and method The object of the present invention is to realize a low-invasive underground exploration apparatus, system, and method which are capable of specifying the kind, three-dimensional position, and amount of a substance present in the ground. The underground exploration ... | 04/25/2006 |
| 7027957 | Current interrupter assembly A method for determining the influence of one of a plurality of cathodic protection circuits along a pipeline includes switching one of a plurality of cathodic protection circuits off, while the remainder of the plurality of cathodic protection circuits are left on,... | 04/11/2006 |
| 7026820 | Method and apparatus for minimizing direct coupling for downhole logging devices A method and apparatus for minimizing direct coupling between transmitters and receivers on a downhole logging tool are disclosed. One embodiment includes a transmitter, a bucking device, and a plurality of receivers, where signals may be directly coupled from the t... | 04/11/2006 |
| 7002350 | Marine oil and gas exploration system using telluric currents as a natural electromagnatic energy source A marine oil and gas exploration system used for measuring telluric currents as a natural electromagnetic energy source flowing beneath an ocean and sea floor. The marine exploration system includes a towed fish adapted for being pulled behind a survey ship. The coo... | 02/21/2006 |
| 6999878 | Method and installation for locating the position of the boundary formed at the interface between two fluids contained in a reservoir Process for the location of the position of the interface (5) between two fluids (f1, f2) each contained in a zone (7-1, 7-2) of a reservoir (4) in which: a) a reference transient flow condition that produces a refere... | 02/14/2006 |
| 6954630 | Method for location-based billing for mobile communication A method for location-based billing for mobile telecommunication is described in this application. In this context, subscribers communicating on a mobile basis are subject to separate billing within a special billing zone as soon as a network server establishes that... | 10/11/2005 |
| 6943553 | Method and apparatus for rapid tomographic measurements of the electrical conductivity distribution of a sample A method and apparatus for the rapid tomographic measurement of conductivity distribution in a sample in which current excitations or voltage excitation is applied to the sample via electrodes or the like and potential differences or magnetic field strengths associa... | 09/13/2005 |
| 6894499 | Device for measuring an electrical parameter through electrically-conductive casing The invention relates to a device for measuring an electrical parameter through electrically-conductive casing, said device including a current injection electrode (3) and a measurement electrode (7) on one side of the wall of the casing (1). Ac... | 05/17/2005 |
| 6804625 | Subsurface modeling method A method is provided for detecting and locating anomalies in soil subjacent to an existing structure. Electrodes are placed into the soil both outside the structure and through the structure's foundation. Electrical resistivity data is collected using these electrod... | 10/12/2004 |
| 6778918 | Methods for monitoring fluid front movements in hydrocarbon reservoirs using permanent sensors A method of monitoring a fluid front movement is provided. The method includes: determining at least two techniques for monitoring the fluid front movement; determining a configuration of monitoring sensors, corresponding to the at least two monitoring techniques, f... | 08/17/2004 |
| 6766276 | Method and device for detecting a dysfunction of an ulatrasonic flowmeter A method for detecting malfunctions in a flowmeter includes the measuring of the receive signal VIN output by a transducer. A characteristic of the receive signal is compared to a predetermined reference characteristic VREF and the peak voltage... | 07/20/2004 |
| 6747205 | Device for assisting in the measurement of the earth resistance The invention relates to a device for assisting in the measurement of the earth resistance comprising a ground rod with a wire coiled up on a reel or the like, and electrical connecting means for connecting the wire to the ground rod. To provide such a device which ... | 06/08/2004 |
| 6745070 | High definition electrical impedance tomography A method of imaging an object contained in a medium, having a specific impedance which is different from the specific impedance of the medium, comprising applying current to the medium at various locations at a surface of the medium, extracting current at other loca... | 06/01/2004 |
| 6441618 | Method and apparatus for monitoring the advance of seawater into fresh water aquifers near coastal cities Sensors are permanently placed in the ground near observation and injection wells in order to passively and continuously monitor the status of seawater advance toward fresh water aquifers near coastal cities as well as the status of fresh water injected i... | 08/27/2002 |
| 6414511 | Arrangement for transient-current testing of a digital electronic CMOS circuit For transient-current testing of an electronic circuit, a differentiating current measuring device is arranged for measuring an undershoot voltage for each of a series of current pulses controlled in the circuit. In particular, the device is executed in i... | 07/02/2002 |
| 6411095 | Apparatus and method for locating an object The invention is directed to an apparatus and method for locating objects in a body through the mapping and imaging of the conductivity profiles of such objects by applying a force to the object and/or body and measuring certain characteristics of the bod... | 06/25/2002 |
| 6405143 | Method and system for determining potential fields A method for determing the potential in a three-dimensional domain containing a source domain of source particles and a target domain of target particles involves assigning the source particles into source particle clusters and the target particles into t... | 06/11/2002 |
