| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 324344000 | With radiant energy or nonconductive-type receiver | 12 |
| 20080290875 | Seismic activity detector - A system for detecting precursor seismic electromagnetic waveforms. | 11-27-2008 |
| 20090201024 | Ground Conductivity Meter with Automatic Calibration - A ground conductivity meter that includes a transmitter coil and a receiver coil that are horizontally spaced apart from each other, and a conductivity meter controller connected to the transmitter and receiver coils and including an electronic storage element and at least one processor, the conductivity meter controller being operative to: determine a first conductivity reading in dependence on signals from the receiver coil when the transmitter coil and receiver coil are positioned a predetermined distance above a ground surface in one of a vertical dipole orientation or a horizontal dipole orientation; determine a second conductivity reading in dependence on signals from the receiver coil when the transmitter coil and receiver coil are positioned the predetermined distance above the ground surface in the other of the vertical dipole orientation or horizontal dipole orientation; calculate a correction factor in dependence on the first and second conductivity readings and store the correction factor in the storage element; and determine a plurality of further conductivity readings in dependence on signals from the receiver coil during a site survey, and apply the stored correction factor to the further conductivity readings to produce corrected conductivity readings for the site survey. | 08-13-2009 |
| 20100001735 | SURVEYING A SUBTERRANEAN STRUCTURE USING ELECTROMAGNETIC MEASUREMENTS AND MICROORGANISM CONTENT DATA - A survey apparatus for surveying a subterranean structure includes an electromagnetic (EM) sensing element to measure an EM field received from the subterranean structure, and a sample collector activatable to collect a sample of soil. | 01-07-2010 |
| 20110001482 | Electromagnetic Survey Using Naturally Occurring Electromagnetic Fields as a Source - Methods and related systems are described for measuring naturally occurring electromagnetic fields both at the earth's surface as well as downhole. These fields originate from currents in the ionosphere above the earth, and are the same fields as employed by known magnetotelluric geophysical methods based on surface measurements. Some embodiments are especially useful in horizontal wells that are uncased at depth, although some embodiments are also useful in normal vertical wells that are both uncased or cased with a conductive liner. The method includes receiving downhole electromagnetic survey data of the naturally occurring electromagnetic fields obtained using a downhole receiver deployed at a first location in a borehole. A second set of electromagnetic survey data of the naturally occurring electromagnetic fields is also received that has been obtained using a receiver deployed at a second location. A transfer function is estimated between the first and second locations for portions of the electromagnetic fields based on the two sets of electromagnetic survey data. | 01-06-2011 |
| 20110001483 | Subsea Electronic Modules - A module for use as a subsea electronic module of a subsea well, comprises an input ( | 01-06-2011 |
| 20110095763 | GEOLOGIC MAPPING USING LIGHTNING - A method and apparatus includes detecting lightning induced electromagnetic pulses and determining a physical property of an underground structure based on the lightning induced electromagnetic pulses. In some embodiments, an apparatus includes an antenna, a low noise amplifier, a processor, cable, and a transmitter. The antenna includes three substantively perpendicular loops of electrical conductors. The processor is configured to condition the amplified signal. The cable is about 100 meters in length and connects the low noise amplifier to the processor. The transmitter is configured to send conditioned data to a data aggregation system. | 04-28-2011 |
| 20110227579 | SURVEYING A SUBTERRANEAN STRUCTURE USING A VERTICALLY ORIENTED ELECTROMAGNETIC SOURCE - To perform a marine survey of a subterranean structure, a vertically oriented electromagnetic (EM) source is positioned in a body of water, where the EM source is coincident with an EM receiver. The EM source is activated to cause transmission of EM energy into the subterranean structure. After deactivation of the EM source, an EM field affected by the subterranean structure is measured by the EM receiver. In an alternative implementation, a survey system is provided that has a continuous wave EM source, a main EM receiver, and an auxiliary EM receiver. | 09-22-2011 |
| 20130293233 | Method For Guiding A Downhole Tool Assembly Using An Above-Ground Receiver System - A method and receiver system for identifying a location of a magnetic field source using two horizontally displaced tri-axial antennas. In a preferred embodiment two tri-axial antennas are positioned at opposite ends of a receiver frame. Each antenna detects in three dimensions a magnetic field from a source or transmitter. The receiver is maintained in a horizontal plane and the receiver is moved in the horizontal plane until a flux angle measured at each of the two points is zero so that the receiver is in the vertical plane perpendicular to the axis of the source. The depth and location of the source in three dimensions relative to the receiver is determined using the detected field values. The receiver is moved in a direction defined by a line containing the two points of the receiver until a magnitude of the magnetic field detected at each of the two points is substantially the same so that the receiver is positioned above the source. | 11-07-2013 |
| 20140139225 | WELL MONITORING WITH OPTICAL ELECTROMAGNETIC SENSORS - A method of measuring an electromagnetic field in a subterranean earth formation can include installing at least one electromagnetic sensor in a well, the sensor including an optical waveguide and a material, the material changing shape in response to exposure to the electromagnetic field, and strain in the optical waveguide changing in response to the material changing shape. A well system can include an optical electromagnetic sensor installed in a well, and a transmitter which induces an electromagnetic field in an earth formation. Strain is induced in an optical waveguide of the sensor in response to the electromagnetic field. A method of monitoring an earth formation can include installing an optical electromagnetic sensor in a wellbore which penetrates the formation, and a strain being induced in an optical waveguide of the sensor in response to the electromagnetic field. | 05-22-2014 |
| 20140139226 | OPTICAL PUSH-PULL INTERFEROMETRIC SENSORS FOR ELECTROMAGNETIC SENSING - A method of measuring an electromagnetic field in a formation can include installing an electromagnetic sensor with improved sensitivity, the sensor including multiple optical waveguides and respective multiple materials, and in response to exposure to the electromagnetic field, the materials changing shape in opposite directions. A well system can include an optical electromagnetic sensor which measures an electromagnetic field in a formation, and wherein optical path lengths or phases in optical waveguides of the sensor change both positively and negatively in response to exposure to the electromagnetic field. A method of monitoring a formation can include installing an optical electromagnetic sensor in a wellbore which penetrates the formation, and an optical path length/phase in an optical waveguide of the sensor increasing in response to exposure to the electromagnetic field, and an optical path length/phase in another optical waveguide of the sensor decreasing in response to exposure to the electromagnetic field. | 05-22-2014 |
| 20150355367 | SENSORS, TOOLS AND SYSTEMS CONTAINING A METALLIC FOAM AND ELASTOMER COMPOSITE - The present disclosure relates to a logging sensor or tool including a structural component, a non-structural component, and a composite disposed between the structural component and the non-structural component. The composite may contain a metallic foam having pores and an elastomeric material deposited in the pores. The elastomeric material may include an elastomer and a plurality of metallic shield particles. The disclosure further relates to a logging system and to a wireline system containing such a logging sensor or tool. | 12-10-2015 |
| 20160031529 | Towing Methods and Systems for Geophysical Surveys - Disclosed are methods and systems for controlling spread and/or depth in a geophysical survey. An embodiment discloses a submersible deflector, comprising: an upper portion comprising an upper fin section and upper foils disposed below the upper fin section, wherein at least one slot is defined between the upper foils; and a lower portion coupled to the upper portion and disposed below the upper portion, wherein the lower portion comprises a lower fin section and lower foils disposed above the lower fin section, wherein at least one slot is defined between the lower foils. Also disclosed are marine geophysical survey systems and methods of performing geophysical surveys. | 02-04-2016 |
