Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8098070 | 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 instrum... | 01/17/2012 |
| 8085049 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 12/27/2011 |
| 7948238 | Electromagnetic wave resistivity tool having a tilted antenna for determining properties of earth formations This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 05/24/2011 |
| 7924014 | 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 vertic... | 04/12/2011 |
| 7863901 | 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, extractin... | 01/04/2011 |
| 7759941 | 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 a... | 07/20/2010 |
| 7675290 | 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 vertic... | 03/09/2010 |
| 7659721 | 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 vertic... | 02/09/2010 |
| 7659722 | Method 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 a... | 02/09/2010 |
| 7557580 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 07/07/2009 |
| 7557579 | Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 07/07/2009 |
| 7504829 | Methods and apparatus for subsurface geophysical exploration using joint inversion of steady-state and transient data Methods and apparatus are provided for controlled source electromagnetic surveying. In particular, a time-varying electromagnetic signal is transmitted at a first location, and an electromagnetic signal responsive to the transmitted signal is received at a second lo... | 03/17/2009 |
| 7456632 | Method for monitoring low-resistivity formation using polarized waves A method for monitoring a high-resistivity reservoir rock formation (2) below one or more less resistive formations (3). The method includes transmitting an electromagnetic signal (S) propagating from near a seafloor or land surface (1) by means... | 11/25/2008 |
| 7430474 | Removing sea surface-related electromagnetic fields in performing an electromagnetic survey To perform surveying of a subterranean structure, electromagnetic (EM) wavefields traveling in opposite directions are determined. A relationship is defined among the EM wavefields, where the EM wavefields include a first set of EM wavefields in a first state in whi... | 09/30/2008 |
| 7423432 | System and method for electromagnetic wavefield resolution A method processing an electromagnetic wavefield response in a seabed logging operation. The wavefield is resolved into upgoing- and downgoing components. The downgoing component represents reflections from the sea surface while the upgoing component represents refl... | 09/09/2008 |
| 7411399 | Electromagnetic survey system with multiple sources Multiple sources are provided for a transmitter cable for use in electromagnetic surveying. The transmitter cable includes a dipole antenna comprising a pair of spaced apart electrodes mounted on their respective cables. Two antennas may be powered from each source.... | 08/12/2008 |
| 7362260 | Method of using continuous-wave radiation for detecting and locating targets hidden behind a surface Continuous-wave radiation is used to detect a target hidden behind a surface. In an embodiment, a transmitter directs a beam of continuous-wave microwave radiation from a transmitting location, and reflected radiation from the target is received at first and second ... | 04/22/2008 |
| 7336079 | Aerial electronic detection of surface and underground threats An aerial electronic system for detection of surface and underground threats comprises an electromagnetic (EM) gradiometer flown aloft over the possible ground and underground threats to a convoy. The EM gradiometer is disposed in a Styrofoam torpedo shaped pod that... | 02/26/2008 |
| 7330790 | Method of seismo electromagnetic detecting of hydrocarbon deposits A method of seismo electromagnetic detecting of hydrocarbon deposits has the steps of simultaneously initiating an electromagnetic field and a seismic wave in investigated geological region so that an electromagnetic signal originates by vibrating of hydrocarbon dep... | 02/12/2008 |
| 7319330 | System and method for electromagnetic wavefield resolution A method of processing an electromagnetic wavefield response in a seabed logging operation. The wavefield is resolved into upgoing and downgoing components. The downgoing component represents reflections from the sea surface while the upgoing component represents re... | 01/15/2008 |
| 7307424 | Electromagnetic surveying for hydrocarbon reservoirs An electromagnetic survey method for surveying an area that potentially contains a subterranean hydrocarbon reservoir. The method comprises detecting a detector signal in response to a source electromagnetic signal, resolving the detector signal along at least two o... | 12/11/2007 |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7265552 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 09/04/2007 |
| 7262602 | Active geophysical prospecting system An active system and method for determining the physical characteristics and geological composition of subterranean formations is described. Plane polarized electromagnetic waves at specific frequencies are transmitted by a mobile transmitting antenna held stationar... | 08/28/2007 |
| 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 |
| 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 |
| 7243718 | Methods for locating formation fractures and monitoring well completion using streaming potential transients information Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 07/17/2007 |
| 7233150 | While-drilling apparatus for measuring streaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 06/19/2007 |
| 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 |
| 7205769 | Method and apparatus for processing a signal received by an electromagnetic prober An electromagnetic prober comprising a transmission antenna, a reception antenna, a reception signal processing section for generating an analytic signal on the basis of a detection signal of the reception antenna, and an analytic processing section for performing a... | 04/17/2007 |
| 7202669 | Method and apparatus for determining the nature of subterranean reservoirs A system for detecting or determining the nature of a subterranean reservoir. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. The measurements are taken with the antenna both in-line and pa... | 04/10/2007 |
| 7190168 | Method of measuring in-medium dielectric constant for electromagnetic prober, and electromagnetic prober An electromagnetic prober comprising a transmission antenna, a reception antenna, a reception signal processing section for generating an analytic signal on the basis of a detection signal of the reception antenna, and an analytic processing section for performing a... | 03/13/2007 |
| 7157914 | Airborne electromagnetic time domain system, computer product and method An airborne time domain electromagnetic surveying system is provided. The system includes a tow assembly with a flexible support frame. The flexible support frame spaced apart from the aircraft includes a transmitter section with a transmitter loop and a receiver se... | 01/02/2007 |
| 7150188 | Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a... | 12/19/2006 |
| 7149513 | Process for analysing the ambient electromagnetic field and associated portable device The invention relates to a process for analysing the ambient electromagnetic field in which, to determine the field level of one or more cellular telecommunication networks, the field is analysed at the frequencies of the beacon pathways of base stations of the netw... | 12/12/2006 |
| 7145341 | Method and apparatus for recovering hydrocarbons from subterranean reservoirs The present invention relates to a system and apparatus for detecting and recovering hydrocarbons located in a subterranean reservoir In some embodiments, an electromagnetic field is applied by a transmitter positioned on a seabed and detected by antenna also positi... | 12/05/2006 |
| 7138803 | Electromagnetic wave resistivity tool having a tilted antenna for geosteering within a desired payzone This invention is directed to a downhole method and apparatus for simultaneously determining the horizontal resistivity, vertical resistivity, and relative dip angle for anisotropic earth formations. The present invention accomplishes this objective by using an ante... | 11/21/2006 |
| 7123017 | Specific dielectric constant calibration method for an electromagnetic prober An electromagnetic prober comprising a transmission antenna, a reception antenna, a reception signal processing section for generating an analytic signal on the basis of a detection signal of the reception antenna, and an analytic processing section for performing a... | 10/17/2006 |
| 7123016 | Systems and methods useful for detecting presence and / or location of various materials The present invention provides systems and methods which can be employed to locate or detect presence of various materials, including nonferrous metals. These systems include new and useful sensors, circuits, systems and devices which power and/or interoperate with ... | 10/17/2006 |
| 7109717 | System and method for hydrocarbon reservoir monitoring using controlled-source electromagnetic fields The system and method for real-time monitoring of a hydrocarbon reservoir (4) during extraction include an electro-magnetic source assembly (16) for transmitting a first plurality of electromagnetic fields. A plurality of seafloor antennae (30 | 09/19/2006 |
