Class / Patent application number | Description | Number of patent applications / Date published |
324348000 | For detecting naturally occurring fields, currents, or potentials | 20 |
20080238429 | Receivers and Methods for Electromagnetic Measurements - A receiver for electromagnetic measurements includes a polyhedron structure having m faces, where m≧4 and m≠6: n electrodes each disposed on one face of the polyhedron structure, wherein 3≦n≦m; and at least one circuitry connected to the n electrodes for signal measurement. A method for electromagnetic measurements includes obtaining a plurality of electric current measurements using a plurality of electrodes each disposed on a surface of a polyhedron receiver, wherein the plurality of electric current measurements comprise at least three different measurements; and determining electric field components in a three dimensional space from the plurality of electric current measurements by using a number of matrices that correlate orientations of surfaces of the polyhedron receiver to a coordinate system in the three dimensional space. | 10-02-2008 |
20090001988 | ELECTRICAL CONNECTOR INTERFACED WITH CONDUCTIVE INK ON A CARDBOARD SUBSTRATE - An inventory control system, comprising a blister pack having a pierceable sheet that includes a plurality of printed circuits overlying each of the compartments of the blister pack. The printed circuits are in electrical communication with a connector assembly, the connector assembly being in electrical communication with a removable header. The header is in communication with a microprocessor controlled device having a memory; wherein the microprocessor controlled device determines the contents of the blister pack. The blister pack and connector assembly are removed from the substantially fixed header so the contents can be distributed. As the contents are distributed from the blister pack, the printed circuits are broken. When the connector assembly is reattached to the blister pack, electrical signals transmitted through the connector assembly and the blister pack determines the number of broken circuits, indicative of the contents of the blister pack. The connector assembly is a reusable device that includes a board that provides for electrical communication between the header and the blister pack and also facilitates assembly and removal of the connector to the header. | 01-01-2009 |
20090015262 | BUOY-BASED MARINE ELECTROMAGNETIC SIGNAL ACQUISITION SYSTEM - A sensor cable system for measuring electromagnetic response of the Earth's subsurface includes a sensor cable deployable on the bottom of a body of water. The sensor cable has a plurality of electromagnetic sensing devices thereon at spaced apart locations. A system control unit is in signal communication with the sensing elements. The system control unit includes a transceiver for communicating signals to and from a corresponding sensor cable system. The system control unit includes a global positioning system signal receiver. The system control unit includes a processor configurable to receive signals detected by sensing elements in the corresponding sensor cable system. The processor is configurable to compute stacked signals from the sensing elements in the sensor cable and from sensing elements in the corresponding system. The processor is configurable to calculate a statistical measure of the stacked signals. The system control unit is disposed in a flotation device. | 01-15-2009 |
20100045296 | Cable system for marine data acquisition - Systems and methods for marine surveying of strata beneath a seafloor are disclosed, including, in certain aspects, systems employing one or more cables with a plurality of opto-electrical detector electrodes and an electrical wire with a fixed reference potential imposed thereon along the cable length. In a multi-cable system, the same fixed reference potential is applied to all wires in all cables. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b). | 02-25-2010 |
20100321024 | DERIVING AN ELECTROMAGNETIC FIELD IN ONE DIRECTION BASED ON MEASUREMENT DATA OF ONE OR MORE SENSING ELEMENTS FOR MEASURING AN ELECTROMAGNETIC FIELD IN ANOTHER DIRECTION - A survey module includes at least one sensing element to measure a first electromagnetic (EM) field along a first direction, and circuitry to derive a second EM field along a second, different direction based on the first EM field. | 12-23-2010 |
20120182016 | SENSOR DEVICE AND METHOD FOR THE GEOELECTRICAL PROSPECTING OF RAW MINERAL DEPOSITS - A sensor device and a method for the geoelectrical prospecting of the location, the (stratographic) arrangement, and the course of raw mineral deposits and of the adjoining rock delimiting these deposits, particularly in the continuous working of the mineral deposits, having a sensor head whose front surface forms the sensor measuring surface, and at least one electrode. The sensor head can make contact with a ground surface, and a central electrode and a plurality of outer electrodes distributed geometrically uniformly around the central electrode are arranged on the sensor measuring surface, the central electrode and the outer electrodes being electrically conductive and electrically separated from one another. | 07-19-2012 |
20130300419 | Methods, Systems and Apparatuses for Sensing and Measuring the Electric Field within the Earth - Methods, systems, and apparatuses for measuring an electric potential in the earth, which includes a first sensor are disclosed. The first sensor includes a sensing plate for placement in an environment in close proximity to the earth. The sensing plate has an operative capacitive coupling with the earth and measures the earth's electric potential. The sensor also includes a barrier providing electrochemical segregation between the sensing plate and the earth and an amplifier having at least one stage for receiving and amplifying a first signal carrying the potential measured by the sensing plate. The sensor also includes a first connection carrying the first signal from the sensing plate to the amplifier; and a reference voltage for application to the first stage of the amplifier, the reference voltage providing a reference against which the potential measured by the sensing plate is compared. Other embodiments are described and claimed. | 11-14-2013 |
20140361777 | SENSOR FOR MEASURING THE ELECTROMAGNETIC FIELDS ON LAND AND UNDERWATER - An electromagnetic sensing system operates either in land environments or in marine environments on the floor of a body of water to measure electromagnetic fields. The sensing system has electrodes that provide capacitive coupling to the local environment where measurements are being made. A new method of deployment in water provides considerable size and weight reductions. The size and weight reductions also facilitate deployment and rapid repositioning on land. The system is particularly beneficial for surveying sites adjacent to bodies of water. | 12-11-2014 |
324349000 | Of the telluric type | 5 |
324350000 | Including magneto-telluric type | 5 |
20080265896 | MULTI-COMPONENT MARINE ELECTROMAGNETIC SIGNAL ACQUISITION METHOD - A method for measuring magnetotelluric response of the Earth includes measuring transient controlled source electromagnetic response of the subsurface below a body of water over a plurality of actuations of an electromagnetic transmitter. The transient response measurements are stacked. The stacked transient responses are subtracted from measurements of total electromagnetic Earth response over a time period including the plurality of transient response measurements to generate the magnetotelluric response. A method for determining a component of electric field response to a time varying electromagnetic field induced in the Earth's subsurface, includes measuring magnetic field gradient in at least two orthogonal directions in response to the induced electromagnetic field and determining an electric field response in a direction normal to the magnetic field gradient measurements. | 10-30-2008 |
20090039891 | ELECTROMAGNETIC SURVEYING FOR HYDROCARBON RESERVOIRS - A method of electromagnetic surveying of an area of seafloor that is thought or known to contain a subterranean hydrocarbon reservoir is described. The method includes broadcasting an EM signal from a horizontal electric dipole (HED) transmitter and obtaining vertical electric dipole (VED) response data at a remote receiver in response thereto. Survey data are analysed by comparing the VED response data with background data which are not sensitive to the postulated hydrocarbon reservoir. Accordingly, differences between the VED response data and the background data allow for the identification of buried hydrocarbon reservoirs. The background data may be provided by magneto-telluric surveying, controlled source electromagnetic surveying or from direct geophysical measurement. By employing VED response data in this way, surveys may be performed in shallower water than has previously been possible since the VED detector is not sensitive to air-wave components of the EM field induced by the HED transmitter at the VED detector. | 02-12-2009 |
20090295394 | SENSOR CABLE FOR ELECTROMAGNETIC SURVEYING - A sensor cable for surveying. The sensor cable may comprise at least one pair of current sensor electrodes and an amplifier. The current sensor electrodes may be disposed along opposite sides of the sensor cable. The current sensor electrodes may be configured to detect current in an electromagnetic field transverse to an inline direction of the sensor cable. The amplifier may be configured to amplify the current in the electromagnetic field for detection by the electrode pair. | 12-03-2009 |
20090302853 | HIGH RESOLUTION MAGNETOTELLURIC METHOD FOR REMOVING STATIC FREQUENCY DOMAIN - A high resolution magnetotelluric method for removing a static frequency domain, comprising steps of: (1) installing multiple sampling devices at the surface of the area to be explored in a form of an array, adjacent observation points sharing a same electrode; (2) performing conventional processing on all observation results whereby obtaining conventional observation curves of the observation points; (3) for the time series data of the original observation value of the electric field along the same direction of all observation points, adding electric-filed components of two adjacent observation points, those of three adjacent observation points, . . . , and those of all points whereby obtaining electric fields of different polar distance, i.e. a sequence of electric field components of topology points and encrypted topology points; (4) using the sequence of the electric field components of the topology points sequence and the encrypted topology points sequence obtained above as an observation field value to perform power spectrum analysis and impedance tensor estimate, whereby obtaining a series of topological observation curves of a same record point; (5) drawing a resistance—variation of polar distance curve of a single frequency point of the record point; observing and analyzing a variation rule of resistivity, editing and deleting static interference resistance, whereby obtaining a resistivity value of the point at the frequency; and (6) repeating the previous step to complete edition of all frequency points of all record points, whereby obtaining observation results without the static frequency domain. | 12-10-2009 |
20110037473 | Data acquisition method with a three dimensional small bin electromagnetic consecutive array - Disclosed herein is a three dimensional small bin electromagnetic consecutive array data acquisition method used in oil exploration comprising the steps of recording data using small bin lattices on execution of arrangement electrodes, each acquisition station (E | 02-17-2011 |
324351000 | Within a borehole | 7 |
20080303525 | SINGLE-DIPOLE HIGH FREQUENCY ELECTRIC IMAGER - A single-dipole sensor for determining an electrical property of an earth formation, includes a pad consisting essentially of a body and at least one small electrode separated from a large electrode by an insulator; wherein an output of the sensor includes a measurement of an electrical signal through the formation for each small electrode. A method for using the sensor is included, as well as a method for providing images of the earth formation. | 12-11-2008 |
20110204897 | Method and Apparatus with High Resolution Electrode Configuration for Imaging in Oil-Based Muds - Various disclosed resistivity imaging tools and methods provide a high-resolution electrode configuration for imaging in oil-based imaging in oil-based muds. Some tool embodiments have a sensing surface that comprises: a measurement electrode, a focus electrode surrounding the measurement electrode, and a return electrode surrounding the focus electrode. The sensing surface can be provided on an extendable sensor pad or on the wall-contacting portion of a stabilizer. Some method embodiments include measuring the measurement electrode current while driving a voltage signal between the measurement electrode and the return electrode. The voltage signal may simultaneously or sequentially provide energy at different frequencies. The resistivity measurements are combined with tool position and orientation measurements to form a borehole wall image. Robust and reliable performance is expected in the hostile conditions often experienced by logging while drilling (LWD) tools, coupled with the ability to make micro-resistivity measurements with a resolution approaching that of electrode-grid tool designs. | 08-25-2011 |
20120299596 | Method and Apparatus for Measuring Borehole Mud Resistivity - Apparatuses, methods for manufacturing an apparatus and methods for measuring a fluid resistivity are provided. An apparatus for measuring a fluid resistivity includes a fluid column defining structure, two current injecting electrodes, voltage measurement electrodes, and two additional electrodes. The fluid column defining structure is configured to allow a fluid, whose resistivity is to be measured, to fill a fluid column inside the fluid column defining structure. The two current injecting electrodes are configured to inject a known current into the fluid column. The voltage measurement electrodes are configured to measure a voltage across a measurement column included in the fluid column. The two additional electrodes disposed inside the fluid column defining structure, outside of the positions of the two current injecting electrodes in the longitudinal direction are electrically connected to each other. | 11-29-2012 |
20130193975 | ELECTROLOCATION APPARATUS AND METHODS FOR PROVIDING INFORMATION ABOUT ONE OR MORE SUBTERRANEAN FEATURE - In some embodiments, a method of approximating or determining at least one dimension of at least one underground geological feature in a zone of interest proximate to a well bore includes generating an electric field in the zone of interest while the well bore and geological feature at least partially contain conductive fluid. At least two sensing electrodes are provided in the well bore and configured to detect differences therebetween in electric potential caused by at least one target object in the zone of interest and provide data relating thereto to at least one data processing system. The data processing system(s) approximates or determines the dimension(s) of the geological feature(s) based at least partially upon data provided by the sensing electrodes. | 08-01-2013 |
20140091803 | SYSTEMS FOR AND METHODS OF MONITORING UNDERGROUND CO2 STORAGE - In accordance with aspects of the present disclosure, techniques for monitoring subterranean sequestered CO | 04-03-2014 |
20140361778 | APPARATUS AND METHODS FOR MEASURING SPONTANEOUS POTENTIAL OF AN EARTH FORMATION - An apparatus for measuring spontaneous potential (SP) of an earth formation includes a downhole tool that is moveable within a borehole by conveyance means. A portion of the conveyance means produces a reference DC potential signal. The tool includes a measurement electrode that produces a potential signal representative of SP of the earth formation. The tool also includes circuitry that measures a differential DC potential signal between the potential signal produced by the measurement electrode and the reference DC potential signal. SP data that characterizes SP of the earth formation is generated based upon the output of such circuitry. In one embodiment for a while-drilling tool, the conveyance means and tool are realized by a drill string with an insulative sleeve that supports the measurement electrode and electrically isolates the measurement electrode from the drill string. Other embodiments for while-drilling tools and tools for tough logging conditions are also described. | 12-11-2014 |
324353000 | With fluid movement or pressure variation | 1 |
20090167310 | CHARACTERIZATION OF FORMATIONS USING ELECTROKINETIC MEASUREMENTS - A method for characterization of a formation that includes inducing fluid motion in a formation while making electronic measurements. | 07-02-2009 |