Patents Assigned to Electromagnetic Geoservices AS
-
Patent number: 9097816Abstract: An EM receiver instrument suitable for making underwater electric field measurements. The EM receiver comprises a dipole antenna; an AM modulator for applying modulation to a signal detected by the antenna; a fiber-optic voltage sensor and an application of AM demodulator for applying demodulation to the signal. The fiber-optic sensor may be an interferometric voltage sensor or a phase sensitive voltage sensor.Type: GrantFiled: July 7, 2011Date of Patent: August 4, 2015Assignee: ELECTROMAGNETIC GEOSERVICES ASAInventors: Svein Ellingsrud, Hans Roger Jensen, Geir Bjarte Havsgard
-
Patent number: 8913463Abstract: A passive listening acoustic system and method of use may include source means for providing continuous, pulsed, or pulse coded acoustic signals at two or more frequencies and at least two acoustic sensors or hydrophones which detect and record a signal for use within a Seabed Logging system to determine the position and/or orientation of instruments in the system.Type: GrantFiled: October 11, 2007Date of Patent: December 16, 2014Assignee: Electromagnetic Geoservices ASAInventor: Audun Sodal
-
Patent number: 8712693Abstract: A method for measuring an enhanced electromagnetic field response, especially in a submarine environment, for the purposes of subsurface data acquisition and processing. An electromagnetic field is applied to subterranean strata at two or more different frequencies, a response at each frequency is detected, and the responses at different frequencies are resolved. The differences in the phase and/or amplitude of the responses are analyzed and the nature of the strata is determined. The same method can be used to determine the hydrocarbon content of a reservoir via the use of a borehole.Type: GrantFiled: September 15, 2009Date of Patent: April 29, 2014Assignee: Electromagnetic Geoservices ASAInventor: Frank Agnar Maao
-
Publication number: 20140035759Abstract: A submersible high current PWM-based source system for marine electromagnetic surveying for hydrocarbon exploration. The system converts a periodic, arbitrary digital signal to a high output current in a HED optimized for maximum dipole moment, using PWM modulation and real-time current regulation for precise output amplitude. The design and choice of components allows a wideband EM signal to be generated with sharp transition characteristics and substantially independent of the AC input power characteristics. This in turn enables for improved tailoring of an EM source signal for a specific subterranean prospect, and thus increased accuracy of the EM data.Type: ApplicationFiled: January 27, 2012Publication date: February 6, 2014Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventors: Havard Ramsfjell, Hans Roger Jensen, Svein Ellingsrud
-
Publication number: 20130207661Abstract: An EM receiver instrument suitable for making underwater electric field measurements. The EM receiver comprises a dipole antenna; an AM modulator for applying modulation to a signal detected by the antenna; a fiber-optic voltage sensor and an application of AM demodulator for applying demodulation to the signal. The fiber-optic sensor may be an interferometric voltage sensor or a phase sensitive voltage sensor.Type: ApplicationFiled: July 7, 2011Publication date: August 15, 2013Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventors: Svein Ellingsrud, Hans Roger Jensen, Geir Bjarte Havsgard
-
Patent number: 8228066Abstract: 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 within the housing and at least two arms extending outwards from the housing. Each arm comprises a flexible elongate sheath attached to the housing, a sensor head, a flexible electrical cable attached to the sheath and connecting the sensor head to the data management system and a rod which is removeably locatable within the sheath. The rod is connectable relative to the housing at one end and connectable relative to the sensor head at the end remote from the housing.Type: GrantFiled: June 8, 2007Date of Patent: July 24, 2012Assignee: Electromagnetic Geoservices ASInventors: Svein Ellingsrud, Audun Sodal, Hans Rechsteiner
-
Patent number: 8188748Abstract: A method of determining the nature of subterranean strata. The transmitter antenna is towed by vessel at a distance h above the sea floor. The antenna omits a wave field whose strength is proportional to the current delivered to the antenna and this is monitored. The input voltage to the antenna is also measured and changes in antenna impedance are calculated. Changes in antenna impedance are used together with seismic information to determine the nature of the subsea strata.Type: GrantFiled: February 9, 2007Date of Patent: May 29, 2012Assignee: Electromagnetic Geoservices ASInventor: Tor Schaug-Pettersen
-
Patent number: 8075685Abstract: A concrete formulation, which undergoes controlled deterioration in water, that can be used for making anchors for releasably tethering submarine devices at the seabed. The anchor may have handles for a device release mechanism or a central hole for a central device release mechanism. The formulation includes additives, which cause the cement to transform into non-binding Thaumasite over a pre-set period of time, leaving only natural material on the seafloor.Type: GrantFiled: October 7, 2005Date of Patent: December 13, 2011Assignee: Electromagnetic Geoservices ASInventors: Svein Ellingsrud, Audun Sodal, Hans Rechsteiner, Harald Justnes, Kare Ingvar Johansen
-
Publication number: 20110301850Abstract: A method for measuring an enhanced electromagnetic field response, especially in a submarine environment, for the purposes of subsurface data acquisition and processing. An electromagnetic field is applied to subterranean strata at two or more different frequencies, a response at each frequency is detected, and the responses at different frequencies are resolved. The differences in the phase and/or amplitude of the responses are analyzed and the nature of the strata is determined. The same method can be used to determine the hydrocarbon content of a reservoir via the use of a borehole.Type: ApplicationFiled: September 15, 2009Publication date: December 8, 2011Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventor: Frank Agnar Maao
-
Patent number: 7919965Abstract: A source arrangement for generating electrogmagnetic (EM) wavefields, comprising an EM signal generator, at least three electrodes (141-144) connected to the generator, and a control system. The electrodes are spaced apart but not all in line. The control system is arranged to apply non-coincident time-varying signals or transmissions from the generator between different pairs of the electrodes. The non-coincidence can be by applying the signals sequentially or by applying the signals out of phase.Type: GrantFiled: December 2, 2005Date of Patent: April 5, 2011Assignee: Electromagnetic Geoservices ASInventors: Tor Schaug-Pettersen, Svein Ellingsrud, Terje Eidesmo, Jan-Aage Langeland
-
Publication number: 20100231223Abstract: 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 within the housing and at least two arms extending outwards from the housing. Each arm comprises a flexible elongate sheath attached to the housing, a sensor head, a flexible electrical cable attached to the sheath and connecting the sensor head to the data management system and a rod which is removeably locatable within the sheath. The rod is connectable relative to the housing at one end and connectable relative to the sensor head at the end remote from the housing.Type: ApplicationFiled: June 8, 2007Publication date: September 16, 2010Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventors: Svein Ellingsrud, Audun Sodal, Hans Rechsteiner
-
Publication number: 20100102985Abstract: A system for determining the position and/or orientation of electromagnetic receivers in a network of receiver instruments at a remote location, a first receiver instrument including one or more electromagnetic sensors, the system comprising transmitting means to send a characteristic signal, detecting means to detect transmitted signals from a plurality of receiver instruments, depth measurement means to measure the depth of the first instrument, recording means to store data from the transmitting means, the detecting means and the depth measurement means, and processing means for processing data from the receiver instruments.Type: ApplicationFiled: September 24, 2007Publication date: April 29, 2010Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventors: David Ridyard, Mark J. Wilkinson
-
Publication number: 20100061187Abstract: A passive listening acoustic system and method of use may include source means for providing continuous, pulsed, or pulse coded acoustic signals at two or more frequencies and at least two acoustic sensors or hydrophones which detect and record a signal for use within a Seabed Logging system to determine the position and/or orientation of instruments in the system.Type: ApplicationFiled: October 11, 2007Publication date: March 11, 2010Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventor: Audun Sodal
-
Publication number: 20100052688Abstract: A method of determining the nature of subterranean strata. The transmitter antenna is towed by vessel at a distance h above the sea floor. The antenna omits a wave field whose strength is proportional to the current delivered to the antenna and this is monitored. The input voltage to the antenna is also measured and changes in antenna impedance are calculated. Changes in antenna impedance are used together with seismic information to determine the nature of the subsea strata.Type: ApplicationFiled: February 9, 2007Publication date: March 4, 2010Applicant: ELECTROMAGNETIC GEOSERVICES ASInventor: Tor Schaug-Pettersen
-
Publication number: 20100045295Abstract: A method of producing a survey report on the presence and nature of a subterranean strata: includes simultaneously towing an EM field transmitter and a seismic source behind a vessel, towing at least one streamer behind the vessel, said streamer or streamers having EM field receivers for measuring an electric field and seismic receivers for measuring a seismic response, applying an EM field to the strata using the EM field transmitter and detecting an EM field response using the EM field receivers, applying a seismic event to the strata using the seismic source and detecting the seismic response using the seismic receivers, analysing the EM field response, analysing the seismic responses and reconciling the EM field response and the seismic response to produce the survey report.Type: ApplicationFiled: September 13, 2007Publication date: February 25, 2010Applicant: ELECTROMAGNETIC GEOSERVICES ASAInventors: Rune Mittet, Hans-Roger Jensen, Frank A. Maao, Svein Ellingsrud
-
Patent number: 7567084Abstract: A system for investigating subterranean strata. An electromagnetic field and a seismic event are applied from the same location and the responses are detected using respective receivers both located at a second location spaced from the first. The responses are combined to identify the presence and/or nature of subterranean reservoir. The refracted wave components are used.Type: GrantFiled: March 17, 2004Date of Patent: July 28, 2009Assignee: Electromagnetic Geoservices ASInventors: Terje Eidesmo, Svein Ellingsrud, Anders Farestveit, Sylvia Sandra Pettersen, legal representative, Stale Johansen, Hans Magne Pedersen
-
Publication number: 20080221795Abstract: A method for processing multi-component, multi-offset electromagnetic data measured at at least one multi-component receiver, the data representative of electric and magnetic fields due to a source, the at least one multi-component receiver being disposed at a depth greater than that of the source. The method includes decomposing the measured multi-offset electric and magnetic fields into upgoing and downgoing components; and formulating a noise removal operator from the downgoing components and the properties of the medium surrounding the at least one receiver.Type: ApplicationFiled: June 16, 2005Publication date: September 11, 2008Applicants: STATOIL ASA, ELECTROMAGNETIC GEOSERVICES ASInventors: Lasse Amundsen, Egil Holvik
-
Patent number: 7423432Abstract: 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 reflections and refractions from subterranean strata. The upgoing component is then subjected to analysis.Type: GrantFiled: October 31, 2007Date of Patent: September 9, 2008Assignee: Electromagnetic GeoServices ASInventor: Lasse Amundsen
-
Patent number: 7319330Abstract: 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 reflections and refractions from subterranean strata. The upgoing component is then subjected to analysis.Type: GrantFiled: May 21, 2003Date of Patent: January 15, 2008Assignee: Electromagnetic Geoservices ASInventor: Lasse Amundsen
-
Patent number: 7202669Abstract: 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 parallel and the difference between the two sets of measurements is exploited. A characteristic difference indicates a high resistive layer, which corresponds to a hydrocarbon reservoir.Type: GrantFiled: December 12, 2005Date of Patent: April 10, 2007Assignee: ElectroMagnetic GeoServices ASInventors: Svein Ellingsrud, Terje Eidesmo, Hans Magne Pedersen, Tor Schaug-Pettersen