| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 324337000 | To detect return wave signals | 27 |
| 20080290873 | Subsurface Electromagnetic Measurements using Cross-Magnetic Dipoles - Sensor assemblies including transmitter and receiver antennas to respectively transmit or receive electromagnetic energy. The sensor assemblies are disposed in downhole tools adapted for subsurface disposal. The receiver is disposed at a distance less than six inches (15 cm) from the transmitter on the sensor body. The sensor transmitter or receiver includes an antenna with its axis tilted with respect to the axis of the downhole tool. A sensor includes a tri-axial system of antennas. Another sensor includes a cross-dipole antenna system. | 11-27-2008 |
| 20080290874 | APPLICATIONS OF WIDEBAND EM MEASUREMENTS FOR DETERMINING RESERVOIR FORMATION PROPERTIES - A method for determining reservoir formation properties that consists of exciting the reservoir formation with an electromagnetic exciting field, measuring an electromagnetic signal produced by the electromagnetic exciting field in the reservoir formation, extracting from the measured electromagnetic signal a spectral complex resistivity as a function of frequency, fitting the spectral complex resistivity with an induced polarization model and deducing the reservoir formation properties from the fitting with the induced polarization model. | 11-27-2008 |
| 20090058422 | Fiber optic system for electromagnetic surveying - An electromagnetic survey sensing device includes at least two electrodes disposed at spaced apart locations. An electrical to optical converter is electrically coupled to the at least two electrodes. The converter is configured to change a property of light from a source in response to voltage imparted across the at least two electrodes. The device includes an optical fiber optically coupled to an output of the electrical to optical converter, the optical fiber in optical communication with a detector. | 03-05-2009 |
| 20090108845 | SYSTEM FOR SEISMIC DETECTION AND ANALYSIS - A system and method for detecting and processing electromagnetic signals from seismic activity, wherein the system and method includes an antenna configured to receive electromagnetic signals. The antenna includes a coiled electrical conduit having a length equal to about the diameter of the Earth. The antenna also includes a plurality of center taps disposed about critical resonant frequencies of a compound or element. The system and method also includes a signal processing module in communication with the antenna and configured to receive and process electromagnetic signals. The system and method further includes a impulse generation device configured to generate seismic activity. Furthermore, the system and method includes a control module in communication with the signal processing module and the impulse generation module and configured to provide instruction signals to each. | 04-30-2009 |
| 20090243617 | Method for Electromagnetic Geophysical Surveying of Subsea Rock Formations - A method for electromagnetic geophysical surveying of rock formations ( | 10-01-2009 |
| 20090267608 | Shallow marine electromagnetic hydrocarbon prospecting - A method for determining electrical properties of a submarine petroleum fluid-bearing formation ( | 10-29-2009 |
| 20090302850 | Electromagnetic subterranean imaging instrument - The instrument utilizes at least one electromagnetic signal transmitter and at least one electromagnetic signal receiver with the receiver detecting a receiver signal responsive to the transmitter signal and indicative of subterranean details adjacent to the instrument. The instrument is attachable to a tow vehicle for transport and includes a GPS antenna and tags data gathered by the instrument with GPS position information. The instrument is formed- in modular sections which can be removably attached for collapsing into a smaller space and to allow for flexible configuration of the instrument in various different ways. A wheeled carriage is provided to carry the instrument over the ground. Antennas for the transmitter and receiver, as well as circuitry and cooling systems are all provided to supply the instrument with high resolution and a clear signal indicative of the position and characteristics of subterranean details of interest. | 12-10-2009 |
| 20100013485 | SURVEYING USING VERTICAL ELECTROMAGNETIC SOURCES THAT ARE TOWED ALONG WITH SURVEY RECEIVERS - A system to perform a marine subterranean survey includes at least one vertical electromagnetic (EM) source and at least one EM receiver to measure a response of a subterranean structure that is responsive to EM signals produced by the vertical EM source. At least one tow cable is used to tow the EM source and EM receiver through a body of water. | 01-21-2010 |
| 20100013486 | Method for attenuating air wave response in marine electromagnetic surveying - A method for measuring the electromagnetic response of formations below the bottom of a body of water includes positioning at least one electromagnetic transmitter and at least one electromagnetic receiver in the body of water each at a selected depth below the water surface. A transient electric current is passed through the at least one transmitter. An electromagnetic signal is detected at the at least one electromagnetic receiver. The depths are selected so that substantially all electromagnetic response to the current passed through the transmitter from the air above the body of water in the detected electromagnetic signal occurs before the beginning of a response originating in the formations below the water bottom. | 01-21-2010 |
| 20100019770 | ELECTROMAGNETIC GEOLOGICAL METROLOGY SYSTEM - An electromagnetic geological metrology system comprises:
| 01-28-2010 |
| 20100085055 | METHOD OF MAPPING HYDROCARBON RESERVOIRS IN SHALLOW WATERS AND ALSO AN APPARATUS FOR USE WHEN PRACTISING THE METHOD - A system for marine electromagnetic surveying of hydrocarbon reservoirs is proposed. The system proposed is characterized by high sensitivity to targets containing hydrocarbons and an ability to work in shallow and deep waters. The system includes a transmitter setting up current pulses in water ( | 04-08-2010 |
| 20100117655 | Tool for Azimuthal Resistivity Measurement and Bed Boundary Detection - Systems and methods for performing bed boundary detection and azimuthal resistivity logging with a single tool are disclosed. Some method embodiments include logging a borehole with an azimuthally-sensitive resistivity logging tool; deriving both a resistivity log and a boundary detection signal from measurements provided by said tool; and displaying at least one of the boundary detection signal and the resistivity log. The resistivity log measurements may be compensated logs, i.e., logs derived from measurements by one or more symmetric transmitter-receiver arrangements. Though symmetric arrangements can also serve as the basis for the boundary detection signal, a greater depth of investigation can be obtained with an asymmetric arrangement. Hence the boundary detection signal may be uncompensated. | 05-13-2010 |
| 20100148784 | METHOD OF PROCESSING MARINE CSEM DATA - A method is provided for processing marine controlled source electromagnetic data. Inline and broadside marine controlled source electromagnetic data are provided, for example by means of one or more horizontal electric dipoles and one or more receivers disposed in a water column above a subsurface to be surveyed. A linear combination of the inline and broadside data is formed so as to reduce the airwave content. | 06-17-2010 |
| 20100237871 | Pipe Survey Method Using UWB Signal - A method of surveying the condition of an underground enclosure including the steps of (a) positioning at least one transmitter/receiver unit (including an antenna) within an underground, substantially nonconductive enclosure, such that a substantial air gap exists between the antenna and the inner wall of the enclosure; (b) transmitting an ultra wideband (UWB) signal toward at least a portion of the inner wall; and (c) processing the return signal in order to identify the interface between the soil and a region of conductivity different from the soil. | 09-23-2010 |
| 20110012601 | Method for determining resistivity anisotropy from earth electromagnetic tansient step response and electromagnetic transient peak impulse response - A method for determining resistivity anisotropy of subsurface rock formations includes imparting a transient electromagnetic field into the subsurface rock formations. Electromagnetic response of the formations is measured at a plurality of offsets from a position of the imparting. For each offset, an arrival time from the imparting is determined of a peak of an impulse response such that the response is related to subsurface horizontal and vertical resistivities. For each offset, a step response of the formations is determined at a time from the imparting selected such that the step response is related substantially only to mean resistivity. The arrival time of the peak of the impulse response and the late time value of the step response are used to determine the resistivity anisotropy. | 01-20-2011 |
| 20110084696 | Fiber optic system for electromagnetic surveying - An electromagnetic survey sensing device includes at least two electrodes disposed at spaced apart locations. An electrical to optical converter is electrically coupled to the at least two electrodes. The converter is configured to change a property of light from a source in response to voltage imparted across the at least two electrodes. The device includes an optical fiber optically coupled to an output of the electrical to optical converter, the optical fiber in optical communication with a detector. | 04-14-2011 |
| 20110128003 | SYSTEM AND METHOD FOR MEASUREMENT INCORPORATING A CRYSTAL OSCILLATOR - A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole, a sensor module, including a passive resonating circuit including a crystal oscillator having a resonant frequency that varies with changes in the condition in the downhole environment to reflect the electromagnetic signal and to modulate the electromagnetic signal in response to a condition in the downhole environment in the borehole and a detector positionable to receive the reflected modulated electromagnetic signal. | 06-02-2011 |
| 20110267065 | PACKER FLUID AND SYSTEM AND METHOD FOR REMOTE SENSING - A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy operable to transmit an electromagnetic signal in the borehole, a sensor module, including a passive resonating circuit including a crystal oscillator having a resonant frequency that varies with changes in the condition in the downhole environment in response to a condition in the downhole environment in the borehole and a detector positionable to receive the reflected modulated electromagnetic signal. In an embodiment, a solids-free dielectric medium is provided within an annular volume in the borehole defined by the casing through which the electromagnetic signal is transmitted. | 11-03-2011 |
| 20110291658 | High resolution three dimensional electromagnetic survey method - A method for electromagnetic surveying below the bottom of a body of water includes deploying a plurality of nodal recording devices in a selected pattern on the water bottom. An electromagnetic transmitter is towed in the water. At least one electromagnetic sensor streamer is concurrently towed in the water. The electromagnetic transmitter is actuated at selected times and signals detected by sensors in the nodal recording devices and in the at least one streamer are recorded. | 12-01-2011 |
| 20120038362 | Method and Apparatus for Offshore Hydrocarbon Electromagnetic Prospecting based on Circulation of Magnetic Field Derivative Measurements - A system for offshore hydrocarbon electromagnetic prospecting is described. The system includes a transmitter generating electromagnetic energy and injecting an electrical current into a flooded vertical cable. The circulated induced vertical current time derivative's response generated by this current in the medium is measured by a circular chain of magnetometers. The measured response which is sensitive to the resistivity of targets is proposed to be used to search for and identify hydrocarbons reservoirs. | 02-16-2012 |
| 20120146649 | Electromagnetic Measurements Using a Sensor Cable Having Improved Characteristics - To survey a subterranean structure, for acquiring an electromagnetic (EM) measurement signal across EM receivers having a target axial spacing, a group of more than two EM receivers in an interval defined by the target axial spacing along a sensor cable is provided. The spacing between successive ones of at least some EM receivers in the group is less than the target axial spacing. EM measurements are acquired using the EM receivers in the group. | 06-14-2012 |
| 20120249149 | MODULAR GEOSTEERING TOOL ASSEMBLY - A retrievable tool for steering through an earth formation includes a first tool assembly and a tilted antenna attached to the first tool assembly. The tool also includes a second tool assembly attached to the first tool assembly and a tilted antenna attached to the second tool assembly. The first tool assembly attaches to the second tool assembly so that the antennas are tilted in predetermined directions. The tilted antennas are transmitter antennas or receiver antennas. Each tool assembly is a tubular cylinder with a longitudinal axis running the length of the cylinder, wherein the tubular cylinder has two ends, each end including a rotational attachment mechanism. The tool assemblies attach to each other through their rotational attachment mechanisms. The rotational attachment mechanism may be a screw-on mechanism, press-fit mechanism, or welded mechanism. | 10-04-2012 |
| 20130141101 | RADIO FREQUENCY ASSISTED GEOSTRUCTURE ANALYZER - The invention relates to instruments designated for geophysical survey, in particular for soil mass exploration using electromagnetic waves. Radio frequency assisted geostructure analyzer comprising transmitting antenna and radio transmitter ( | 06-06-2013 |
| 20130221969 | METHODS AND APPARATUS FOR ADAPTIVE SOURCE ELECTROMAGNETIC SURVEYING - Disclosed are methods and apparatus for adaptive source electromagnetic (EM) surveying. In accordance with one embodiment, a source waveform signal is generated, and an outgoing EM signal which is based on the source waveform signal is transmitted using an antenna. A responsive electromagnetic signal is detected using at least one electromagnetic sensor, and a receiver waveform signal based on the responsive electromagnetic signal is obtained. A feedback control signal which depends on at least one input signal is determined. Based on the feedback control signal, the source waveform signal is adapted. Other embodiments, aspects, and features are also disclosed. | 08-29-2013 |
| 20140239958 | METHODS AND APPARATUS FOR ADAPTIVE SOURCE ELECTROMAGNETIC SURVEYING - Disclosed are methods and apparatus for adaptive source electromagnetic (EM) surveying. In accordance with one embodiment, a source waveform signal is generated, and an outgoing EM signal which is based on the source waveform signal is transmitted using an antenna. A responsive electromagnetic signal is detected using at least one electromagnetic sensor, and a receiver waveform signal based on the responsive electromagnetic signal is obtained. A feedback control signal which depends on at least one input signal is determined. Based on the feedback control signal, the source waveform signal is adapted. Other embodiments, aspects, and features are also disclosed. | 08-28-2014 |
| 20140368199 | DOWNHOLE SENSING IN BOREHOLE ENVIRONMENTS - A drill string can include at least one transmit antenna and at least one receive antenna. The transmit antenna transmits at least one electromagnetic signal into a region of an earth formation. The receive antenna receives the signal from the region of the earth formation. The transmit antenna comprises one of a magnetic dipole and an electric dipole, and the receive antenna comprises the other of the magnetic dipole and the electric dipole. At least one characteristic of the region of the earth formation is determined, based at least partially on the signal received by the receive antenna. A homogeneous part of the electromagnetic signal may be reduced, to thereby increase a depth of detection of the characteristic. | 12-18-2014 |
| 20160252641 | METHOD OF SEMI-PERMEABLE TERRAIN GEOPHYSICAL DATA ACQUISITION | 09-01-2016 |
