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8981788 |
Capacitor power supply, voltage monitoring device, method of monitoring voltage, and method of manufacturing capacitor power supply
In a calibration process, a capacitor unit is removed from end terminals, or namely, respective capacitors are not connected to terminals. A prescribed voltage (a known voltage) is applied between... |
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8922214 |
Electromagnetic geophysical survey systems and methods employing electric potential mapping
The present disclosure describes various geophysical survey systems and methods for mapping an electric potential field. At least one illustrative embodiment includes an electromagnetic (EM)... |
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8810248 |
Method of testing electric field recording of a marine electromagnetic sensor cable
A method of testing the electric field recording of a marine electromagnetic sensor cable including electrodes is provided. The method includes causing time varying current to flow between at... |
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8736269 |
Electromagnetic geophysical survey systems and methods employing electric potential mapping
The present disclosure describes various geophysical survey systems and methods for mapping an electric potential field. At least one illustrative embodiment includes an electromagnetic (EM)... |
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8729903 |
Method for remote identification and characterization of hydrocarbon source rocks using seismic and electromagnetic geophysical data
Method for assessing hydrocarbon source rock potential of a subsurface region without well log information. The method uses surface electromagnetic (121) and seismic (122) survey data to obtain... |
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8717030 |
Controlling electromagnetic radiation in a data center
Controlling electromagnetic (‘EM’) radiation in a data center having a number EM sections, including: receiving, by an EM controller, a specification of preferred EM radiation characteristics for... |
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8717031 |
Controlling electromagnetic radiation in a data center
Controlling electromagnetic (‘EM’) radiation in a data center having a number EM sections, including: receiving, by an EM controller, a specification of preferred EM radiation characteristics for... |
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8669766 |
Carbon aerogel based electrode for electric field measurements in water
The present disclosure relates to methods and systems for detecting electric potential difference in water. A first electrode comprising a first electrode body is configured to be in electrical... |
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8638103 |
Electromagnetic logging between borehole and surface
The present disclosure relates to determining a property, such as resistivity, of an earth formation. A transmitter is disposed in a wellbore penetrating the formation, and a plurality of... |
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8633702 |
Apparatus and method for actively balancing impedance of a resistivity measuring tool
An apparatus for making a resistivity measurement of an underground formation surrounding a borehole is provided. The apparatus includes a conductive tool body, at least one current injector... |
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8614579 |
Active standoff compensation in measurements with oil-based mud resistivity imaging devices
Disclosed is an apparatus for estimating a property of an earth formation penetrated by a borehole having a substantially non-conducting liquid. The apparatus includes: a downhole tool having a... |
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8598882 |
Method of monitoring a hydrocarbon reservoir
A method of monitoring an extent of a hydrocarbon reservoir (2) below the earth's surface (4), includes the steps of applying a current between a bottom current electrode (6) and a top current... |
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8575938 |
Electrical power system for towed electromagnetic survey streamers
A marine electromagnetic receiver cable includes a plurality of signal processing modules disposed at spaced apart locations along the receiver cable. A power supply line is connected to each of... |
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8575937 |
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... |
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8482287 |
Method of determining electrical anisotropy in a subsurface formation
Method of determining electrical anisotropy in a subsurface formation, wherein electromagnetic field data from a multi-offset electromagnetic survey obtained by using an electromagnetic source and... |
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8476915 |
Apparatus and method for determining the type of electromagnetic wave generating source
An apparatus for determining a type of an electromagnetic wave generating source, including: a measurement unit that measures electromagnetic field strength at first and second measurement points... |
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8390295 |
Method and apparatus for focusing in resistivity measurement tools using independent electrical sources
A system for measuring a resistivity parameter of an earth formation includes: at least one measurement electrode electrically connected to a first electrical source; at least one guard electrode;... |
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8390294 |
Multi-resolution borehole resistivity imaging
An apparatus, method and computer-readable medium for obtaining a resistivity image of an earth formation. The apparatus includes a downhole assembly configured to be conveyed in a borehole... |
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8274288 |
Multi-transient DC resistivity measurements
A method for measuring resistivity variations in the earth comprising passing a transient current between two source electrodes; measuring the transient current at the source electrodes; measuring... |
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8228066 |
Instrument for measuring electromagnetic signals
A device and method for measuring electromagnetic signals that can be used to take measurements at or near the sea floor. The device comprises a central housing, a data management system located... |
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8134369 |
Method of testing electric field recording of a marine electromagnetic sensor cable
A method of testing the electric field recording of a marine electromagnetic sensor cable including electrodes is provided. The method includes causing current to flow between a pair of first... |
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8115491 |
Providing a tow cable having plural electromagnetic receivers and one or more electromagnetic sources
To perform marine electromagnetic (EM) surveying of a subterranean structure, a marine cable system is provided including a tow cable, a plurality of electromagnetic (EM) sources coupled to the... |
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8115490 |
Concentric return and transmitter electrodes for imaging and standoff distances compensation
A method of estimating a property of an earth formation penetrated by a borehole includes: disposing into the borehole a sensor having a plurality of return electrodes and at least one transmitter... |
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8076942 |
Method for marine electrical survey of oil-and-gas deposits
A method for survey of hydrocarbon deposits in a researched profile of sea-bottom comprises providing a generator generating pulse electric current with a generator frequency in a towable... |
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8072222 |
Signal generator for electromagnetic surveying that produces a signal having an analog continuous waveform
To perform an electromagnetic (EM) surveying of a subterranean structure, a signal generator produces a signal having an analog continuous waveform without steps in the waveform. Producing the... |
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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... |
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7982465 |
Electromagnetic method on shallow water using a controlled source
A method for analyzing acquired electromagnetic measurements (R) made at or in a sea (4) over a seafloor (1) with rock formations (3) having relatively low resistivity (ρ3) for detecting a... |
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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,... |
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7928733 |
Concentric buttons of different sizes for imaging and standoff correction
A method of estimating standoff in a borehole through an earth formation, includes: disposing a sensor including a plurality of return electrodes and at least one transmitter electrode disposed in... |
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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,... |
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7834632 |
Receiver streamer system and method for marine electromagnetic surveying
A receiver streamer system for marine electromagnetic surveying includes a first streamer, and a second streamer disposed substantially parallel to and spaced apart from the first streamer. A... |
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7822562 |
Removing air wave noise from electromagnetic survey data
Method for removing air wave noise from shallow water controlled source electromagnetic survey data, using only the measured data and conductivity values for sea water (140) and air. The method is... |
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7812611 |
Shallow marine electromagnetic hydrocarbon prospecting
A method for determining electrical properties of a submarine petroleum fluid-bearing formation (1) under overburden geological layers (2) of thickness (s) under a seafloor (3) of a sea. The... |
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7800374 |
Multi-component marine electromagnetic signal acquisition cable and system
A marine electromagnetic sensor cable includes a plurality of sensor modules disposed at spaced apart locations along a cable. Each module includes at least one pair of electrodes associated... |
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7746078 |
Method and system of calculating resistivity of an earth formation
Calculating resistivity of an earth formation. At least some of the illustrative embodiments are systems including: a first current source current return (CSCR) pair, said first CSCR pair... |
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7733093 |
Method of and apparatus for measuring tensor resistivity
An induction or propagation apparatus for performing measuring the tensor resistivity of a sample of matter includes a non-conductive, generally cylindrical tubular member adapted to receive the... |
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7692429 |
Electromagnetic detector for marine surveying
A detector for underwater electromagnetic surveying is described. The detector comprises first, second, third and fourth electrodes which are arranged to define first, second and third electric... |
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7602191 |
Cable-type electromagnetic receiver system for subsurface exploration
A marine electromagnetic survey cable includes a reference electrode extending substantially along the entire length of the cable. A plurality of spaced apart measuring electrodes is disposed... |
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7592814 |
Method for monitoring an area containing a subterranean resistive or conductive body, and for obtaining a volume of hydrocarbon therefrom
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... |
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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,... |
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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... |
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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.... |
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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... |
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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... |
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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... |
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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... |
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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... |
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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... |
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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... |
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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... |