Patents by Inventor Julian Edward Kragh
Julian Edward Kragh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10571583Abstract: Methods of acquiring and processing seismic data using derivative sensors, such as strain sensors, that facilitate ground roll noise attenuation with seismic interferometry are disclosed. The methods use both seismic data and their spatial derivatives in computing ground-roll noises which are removed from processed seismic data.Type: GrantFiled: March 30, 2012Date of Patent: February 25, 2020Assignee: WESTERNGECO L.L.C.Inventors: David Fraser Halliday, Julian Edward Kragh, Filippo Broggini
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Patent number: 10274621Abstract: Seismic surveying techniques are described in which seismic receivers in a seismic array are used as seismic sources. These receiver-sources may be used to determine the near-surface structures of the Earth, geometric properties of the survey array, receiver locations and operations of the survey array. The receiver-sources may be driven by drive sequences to produce amplified receiver-source signals, plane waves, surface waves converging towards a point inside the seismic array, surface waves sweeping through the seismic array and/or the like. The receiver-sources may comprise geophones, hydrophones, accelerometers and/or the like. A driver may be used to drive the receiver-sources and the driver may be controlled by a processor. By encoding drive sequences, seismic data generated by the receiver-sources may be separated from seismic data generated by another seismic source in the seismic array.Type: GrantFiled: November 26, 2012Date of Patent: April 30, 2019Assignee: WESTERNGECO L.L.C.Inventors: David Fraser Halliday, Julian Edward Kragh, Pascal Edme, David Neser, Martin Howlid
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Patent number: 9897710Abstract: A tool is described for seismic data collection which may have sensors mounted along its entire length to sample both geophysical signal and noise including at least one of acoustic noise, system noise, and noise resulting from the interaction between the two. Systems and methods for acquiring borehole seismic data are also described. In contrast to conventional systems which attempt to avoid introducing noise into the collected data stream, the present systems include a sufficient type, number, and spacing of sensors to intentionally sample at least one source of noise. The methods include operating a borehole seismic acquisition system to sample both a target signal and at least one source of noise and using a processor with machine-readable instructions for separating the noise from the signal.Type: GrantFiled: May 30, 2013Date of Patent: February 20, 2018Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Julian Edward Kragh, Philip A. F. Christie, Emmanuel Coste, Nicolas Goujon, Clement Kostov
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Patent number: 9651691Abstract: Methods and apparatuses for land seismic survey are provided. The methods and apparatuses utilize spatial derivatives of a seismic wavefield to interpolate, regularize or extrapolate seismic data. The methods and apparatuses may considerably reduce land seismic field efforts and/or compensate data gaps.Type: GrantFiled: April 2, 2013Date of Patent: May 16, 2017Assignee: WESTERNGECO L.L.C.Inventors: Pascal Edme, David Fraser Halliday, Everhard Johan Muijzert, Julian Edward Kragh
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Patent number: 9645265Abstract: A method for selecting parameters of a seismic source array comprising a plurality of source elements each having a notional source spectrum is described, the method comprising calculating a ghost response function of the array; calculating directivity effects of the array; and adjusting the parameters of the array such that the directivity effects of the array are compensated by the ghost response to minimize angular variation of a far field response in a predetermined frequency range. A method for determining a phase center of a seismic source array is also related, the method comprising calculating a far field spectrum of the array at predetermined spherical angles, and minimizing the phase difference between the farfield spectra within a predetermined frequency range by adjusting a vertical reference position from which the spherical angles are defined.Type: GrantFiled: August 1, 2013Date of Patent: May 9, 2017Assignee: WESTERNGECO LLCInventors: Jon-Fredrik Hopperstad, Robert Montgomery Laws, Julian Edward Kragh
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Patent number: 9575196Abstract: Methods and apparatuses for processing seismic data to generate images or determine properties of an interior section of the Earth. The seismic data is processed to filter coherent noise such as ground roll noise from seismic survey data. The noise is attenuated using 3D and/or 2D fan filters, which may have combined low-pass and band-pass filters derived from signal decomposition. The filters are designed with selected operator length, velocity bands of signals and noises and frequency range for a primary trace and adjacent traces within the operator length. The data is decomposed with the filters into signals and noises, and the noises are then filtered from the decomposed data. The process may be repeated for various frequencies and traces within the seismic data. The methods may be used for surveys that have either regular or irregular seismic receiver or seismic source positions.Type: GrantFiled: November 14, 2012Date of Patent: February 21, 2017Assignee: WESTERNGECO L.L.C.Inventors: Ying Ji, Julian Edward Kragh, Ali Özbek
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Patent number: 9575198Abstract: The present disclosure generally relates to the use of a self-propelled underwater vehicle for seismic data acquisition. The self-propelled underwater vehicle is adapted to gather seismic data from the seafloor and transmit such data to a control vessel. The self-propelled underwater vehicle may be redeployed to several seafloor locations during a seismic survey. Methods for real-time modeling of a target zone and redeployment of the self-propelled underwater vehicle based on the modeling are also described.Type: GrantFiled: March 14, 2014Date of Patent: February 21, 2017Assignee: WESTERNGECO L.L.C.Inventors: Kenneth E. Welker, Julian Edward Kragh
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Patent number: 9513391Abstract: To acquire near-zero offset survey data, a survey source and a first streamer attached to the survey source are provided, where the first streamer has at least one survey receiver. A second streamer separate from the survey source and the first streamer includes survey receivers. Near-zero offset data is measured using the at least one survey receiver of the first streamer.Type: GrantFiled: June 17, 2013Date of Patent: December 6, 2016Assignee: WESTERNGECO L. L. C.Inventors: Henk Keers, Aslaug Stroemmen Melboe, Jon-Fredrik Hopperstad, Johan O. A. Robertsson, Julian Edward Kragh, Morten Svendsen, Luren Yang, Svein Arne Frivik
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Patent number: 9417346Abstract: A seismic land vibrator, comprising a baseplate comprising a substantially flat, rigid member; at least one driven member that is connected with the baseplate and extends in a direction that is substantially perpendicular to baseplate; a rotation sensor that is coupled to the baseplate and adapted to provide a signal that is indicative of rotational movement of at least a portion of the baseplate.Type: GrantFiled: August 27, 2014Date of Patent: August 16, 2016Assignee: WESTERNGECO L.L.C.Inventors: Claudio Bagaini, Julian Edward Kragh
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Patent number: 9140814Abstract: A technique facilitates the use of seismic data. The technique utilizes an autonomous underwater vehicle to obtain data on water column characteristics in a seismic survey area. The data can be used to adjust aspects of the seismic survey data and/or the seismic survey technique.Type: GrantFiled: May 28, 2009Date of Patent: September 22, 2015Assignee: WesternGeco L.L.C.Inventors: Kenneth E. Welker, Ottar Kristiansen, Morten Svendsen, Julian Edward Kragh
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Patent number: 9134445Abstract: Embodiments of the invention provide a method of processing marine seismic data, the data having been acquired using a “dense over/sparse under” streamer array having N over streamers disposed at a first depth and M under streamers disposed at a second depth greater than the first depth, where 0<M<N. The method comprises: a) processing seismic data for one of the over streamer target locations and seismic data for one of the under streamer target locations; b) processing seismic data for another of the over streamer target locations; and c) combining the result of (a) and the result of (b). The one of the over streamer target locations and the one of the under streamer target locations may lie in a vertical plane.Type: GrantFiled: January 18, 2010Date of Patent: September 15, 2015Assignee: Schlumberger Technology CorporationInventors: Julian Edward Kragh, Anthony Curtis, Gabriele Busanello
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Patent number: 9103934Abstract: A technique facilitates the acquisition of seismic data at a substantially reduced source volume. The methodology generally comprises conducting a seismic survey with seismic sources that have a reduced source volume to collect seismic data. The low frequency data which is lost due to the reduced source volume is replaced with data acquired from a complementary method, such as a receiver-side acquisition method. The two sets of data are combined to provide a comprehensive seismic survey image without requiring conventional seismic source volume.Type: GrantFiled: January 20, 2010Date of Patent: August 11, 2015Assignee: WESTERNGECO L.L.C.Inventors: Julian Edward Kragh, Robert Laws, Jon-Fredrik Hopperstad
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Patent number: 9091787Abstract: Generating an image of an interior of the Earth from a seismic survey using multiple sources. The multiple sources may be fired simultaneously and the data received by seismic sensors in the seismic survey may be decomposed so that seismic data generated by each of the multiple sources may be determined. Decomposing of the received data may be performed using frequency diverse basis functions and converting the data separation problem into an optimization problem, which can be a one-norm or zero-norm optimization problem in frequency-space domain. The decomposed data may be used to generate the image of the Earth's interior.Type: GrantFiled: November 28, 2011Date of Patent: July 28, 2015Assignee: WesternGeco L.L.C.Inventors: Ying Ji, Julian Edward Kragh, Philip A. F. Christie
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Patent number: 9038765Abstract: Neutrally-buoyant tools for seismic data collection are provided that may range from several hundred meters to several kilometers in length and have integrated sensors which move along with the borehole fluid in response to a passing seismic wave. The disclosure also provides methods of deploying neutrally-buoyant tools, which includes using a tractor, adding a weight or both to the tool in order to overcome the difficulty of lowering a neutrally buoyant tool into a borehole, and optionally occasionally clamping the tool to the borehole to alleviate tension in the tool. This disclosure also provides methods of acquiring seismic data, which involves positioning a neutrally-buoyant tool in a borehole such that the tool is able to move relatively freely along with the borehole fluid in response to a seismic wave passing through the fluid, firing a seismic source, and using the sensors to collect seismic data generated thereby.Type: GrantFiled: June 3, 2013Date of Patent: May 26, 2015Assignee: Schlumberger Technology CorporationInventors: Nicolas Goujon, Julian Edward Kragh, Philip A. F. Christie, Emmanuel Coste, Clement Kostov, Oeyvind Teigen, Toru Ikegami, Marwan Charara
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Publication number: 20150117149Abstract: Methods and apparatuses for land seismic survey are provided. The methods and apparatuses utilize spatial derivatives of a seismic wavefield to interpolate, regularize or extrapolate seismic data. The methods and apparatuses may considerably reduce land seismic field efforts and/or compensate data gaps.Type: ApplicationFiled: April 2, 2013Publication date: April 30, 2015Inventors: Pascal Edme, David Fraser Halliday, Everhard Johan Muijzert, Julian Edward Kragh
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Publication number: 20150066374Abstract: Performing seismic data processing using frequency diverse basis functions and converting a data processing problem into a one-norm or zero-norm optimization problem, which can be solved in frequency-space domain. The data processing problems can be data deghosting, data regularization or interpolation. The data being processed can be aliased or un-aliased, single sensor data or group-formed data, single component or multi-component data single source data or simultaneous sources, or some combinations.Type: ApplicationFiled: April 3, 2013Publication date: March 5, 2015Inventors: Ying Ji, Julian Edward Kragh, Philip A. F. Christie
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Publication number: 20150063065Abstract: A seismic land vibrator, comprising a baseplate comprising a substantially flat, rigid member; at least one driven member that is connected with the baseplate and extends in a direction that is substantially perpendicular to baseplate; a rotation sensor that is coupled to the baseplate and adapted to provide a signal that is indicative of rotational movement of at least a portion of the baseplate.Type: ApplicationFiled: August 27, 2014Publication date: March 5, 2015Inventors: CLAUDIO BAGAINI, JULIAN EDWARD KRAGH
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Patent number: 8958266Abstract: Described are methods for obtaining seismic signals representative of properties of the earth's interior, including the steps of obtaining near-field acoustic signals recorded in the vicinity of a seismic source (13), muting from the near-field acoustic signals at least partly signals representing direct arrivals from the seismic source (13), and using a remaining part of the obtained signals as estimate of a zero-offset data set. The zero-off set data set can then be used to interpolate data from conventional acquisition location, such as streamers (11), to locations closer to the source (13).Type: GrantFiled: August 13, 2007Date of Patent: February 17, 2015Assignee: Schlumberger Technology CorporationInventors: Julian Edward Kragh, Johan Olof Anders Robertsson, Everhard Johan Muyzert, Clement Kostov
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Patent number: 8902700Abstract: A borehole seismic acquisition system is described with a plurality of sensors arranged so as to identify within the data measured by the pressure sensors P- and S-wave related signals converted at the boundary of the borehole into pressure waves, the sensors being best arranged in groups or clusters sensitive to pressure gradients in one or more directions.Type: GrantFiled: June 26, 2006Date of Patent: December 2, 2014Assignee: Schlumberger Technology CorporationInventors: Everhard Johan Muyzert, James Edward Martin, Julian Edward Kragh, Gwénola Claire Marie Michaud
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Publication number: 20140324357Abstract: Methods of acquiring and processing seismic data using derivative sensors, such as strain sensors, that facilitate ground roll noise attenuation with seismic interferometry are disclosed. The methods use both seismic data and their spatial derivatives in computing ground-roll noises which are removed from processed seismic data.Type: ApplicationFiled: March 30, 2012Publication date: October 30, 2014Applicant: WESTERNGECO L.L.C.Inventors: David Fraser Halliday, Julian Edward Kragh, Filippo Broggini