Patents by Inventor Sandip Bose
Sandip Bose 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: 8755249Abstract: Slowness dispersion characteristics of multiple possibly interfering signals in broadband acoustic waves as received by an array of two or more sensors are extracted without using a physical model. The problem of dispersion extraction is mapped to the problem of reconstructing signals having a sparse representation in an appropriately chosen over-complete dictionary of basis elements. A sparsity penalized signal reconstruction algorithm is described where the sparsity constraints are implemented by imposing a l1 norm type penalty. The candidate modes that are extracted are consolidated by means of a clustering algorithm to extract phase and group slowness estimates at a number of frequencies which are then used to reconstruct the desired dispersion curves. These estimates can be further refined by building time domain propagators when signals are known to be time compact, such as by using the continuous wavelet transform.Type: GrantFiled: December 20, 2012Date of Patent: June 17, 2014Assignees: Schlumberger Technology Corporation, Trustees of Boston UniversityInventors: Shuchin Aeron, Sandip Bose, Henri-Pierre Valero, Venkatesh Saligrama
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Publication number: 20140125384Abstract: Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold.Type: ApplicationFiled: January 10, 2014Publication date: May 8, 2014Applicant: Schlumberger Technology CorporationInventors: Abderrhamane Ounadjela, Jacques Jundt, Olivier Moyal, Henri-Pierre Valero, Sandip Bose
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Patent number: 8630148Abstract: Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold.Type: GrantFiled: June 2, 2011Date of Patent: January 14, 2014Assignee: Schlumberger Technology CorporationInventors: Abderrhamane Ounadjela, Jacques Jundt, Olivier Moyal, Henri-Pierre Valero, Sandip Bose
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Publication number: 20130345984Abstract: Methods and apparatus to process measurements associated with drilling operations are described. An example method of modifying processing results during a subterranean formation drilling operation includes identifying a plurality of parameters and processing measurements associated with the subterranean formation obtained while drilling and the plurality of parameters to generate first results. Additionally, the example method includes processing measurements associated with the subterranean formation obtained while drilling is temporarily suspended and the plurality of parameters to generate second results and comparing the first and second results. Further, the example method includes, in response to the comparison of the first and second results, modifying the first results based on the second results to improve a quality of the first results.Type: ApplicationFiled: August 25, 2013Publication date: December 26, 2013Applicant: Schlumberger Technology CorporationInventors: Henri-Pierre Valero, Sandip Bose
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Patent number: 8554483Abstract: Methods and apparatus to process measurements associated with drilling operations are described. An example method of modifying processing results during a subterranean formation drilling operation includes identifying a plurality of parameters and processing measurements associated with the subterranean formation obtained while drilling and the plurality of parameters to generate first results. Additionally, the example method includes processing measurements associated with the subterranean formation obtained while drilling is temporarily suspended and the plurality of parameters to generate second results and comparing the first and second results. Further, the example method includes, in response to the comparison of the first and second results, modifying the first results based on the second results to improve a quality of the first results.Type: GrantFiled: January 11, 2010Date of Patent: October 8, 2013Assignee: Schlumberger Technology CorporationInventors: Henri-Pierre Valero, Sandip Bose
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Publication number: 20130238248Abstract: Methods and apparatus for waveform processing are disclosed. An example method includes determining shrinkage estimators in a Discrete Radon transform domain based on semblance of waveform data and de-noising the waveform data using a processor and the shrinkage estimators to enable the identification of weak signals in the waveform data.Type: ApplicationFiled: December 13, 2012Publication date: September 12, 2013Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Shuchin Aeron, Sandip Bose, Henri-Pierre Valero
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Patent number: 8339897Abstract: Slowness dispersion characteristics of multiple possibly interfering signals in broadband acoustic waves as received by an array of two or more sensors are extracted without using a physical model. The problem of dispersion extraction is mapped to the problem of reconstructing signals having a sparse representation in an appropriately chosen over-complete dictionary of basis elements. A sparsity penalized signal reconstruction algorithm is described where the sparsity constraints are implemented by imposing a l1 norm type penalty. The candidate modes that are extracted are consolidated by means of a clustering algorithm to extract phase and group slowness estimates at a number of frequencies which are then used to reconstruct the desired dispersion curves. These estimates can be further refined by building time domain propagators when signals are known to be time compact, such as by using the continuous wavelet transform.Type: GrantFiled: December 22, 2009Date of Patent: December 25, 2012Assignees: Schlumberger Technology Corporation, Trustees of Boston UniversityInventors: Shuchin Aeron, Sandip Bose, Henri-Pierre Valero, Venkatesh Saligrama
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Publication number: 20120307596Abstract: Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold.Type: ApplicationFiled: June 2, 2011Publication date: December 6, 2012Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Abderrhamane Ounadjela, Jacques Jundt, Olivier Moyal, Henri-Pierre Valero, Sandip Bose
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Publication number: 20120201096Abstract: Methods and apparatus to process time series data for propagating signals in a subterranean formation are disclosed. An example method described herein for processing measured data comprises receiving a time series of measured data obtained by sensing a propagating signal, the propagating signal having passed through a subterranean formation, transforming the time series of measured data to generate a time-frequency representation of the time series, and processing the time-frequency representation to at least one of reduce noise in the time frequency representation, or enhance a component of the propagating signal present in the time-frequency representation.Type: ApplicationFiled: October 27, 2010Publication date: August 9, 2012Inventors: Henri-Pierre Valero, Sandip Bose, Jiaqi Yang, Bikash K. Sinha, Tarek M. Habashy, Andrew Hawthorn
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Patent number: 8199609Abstract: A multimode acoustic source device for disposition in a borehole formed in a subterranean formation is aligned along an axial axis of the borehole and has a plurality of radiating plates circumferentially disposed about the axial axis. A drive mechanism is proposed to independently and reversibly move each radiating plate from a first position to a second position in a direction transverse to the axial axis. This enables the multimode source to generate each of several azimuthal modes for logging a subterranean formation.Type: GrantFiled: February 9, 2009Date of Patent: June 12, 2012Assignee: Schlumberger Technology CorporationInventors: Abderrhamane Ounadjela, Marthe Souquiere, Henri-Pierre Valero, Sandip Bose
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Publication number: 20110172921Abstract: Methods and apparatus to process measurements associated with drilling operations are described. An example method of modifying processing results during a subterranean formation drilling operation includes identifying a plurality of parameters and processing measurements associated with the subterranean formation obtained while drilling and the plurality of parameters to generate first results. Additionally, the example method includes processing measurements associated with the subterranean formation obtained while drilling is temporarily suspended and the plurality of parameters to generate second results and comparing the first and second results. Further, the example method includes, in response to the comparison of the first and second results, modifying the first results based on the second results to improve a quality of the first results.Type: ApplicationFiled: January 11, 2010Publication date: July 14, 2011Applicant: Schlumberger Technology CorporationInventors: HENRI-PIERRE VALERO, SANDIP BOSE
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Publication number: 20100228530Abstract: Automatic detection and accurate time picking of weak events embedded in strong noise such as microseismicity induced by hydraulic fracturing is accomplished by: a noise reduction step to separate out the noise and estimate its spectrum; an events detection and confidence indicator step, in which a new statistical test is applied to detect which time windows contain coherent arrivals across components and sensors in the multicomponent array and to indicate the confidence in this detection; and a time-picking step to accurately estimate the time of onset of the arrivals detected above and measure the time delay across the array using a hybrid beamforming method incorporating the use of higher order statistics. In the context of hydraulic fracturing, this could enhance the coverage and mapping of the fractures while also enabling monitoring from the treatment well itself where there is usually much higher and spatially correlated noise.Type: ApplicationFiled: January 5, 2010Publication date: September 9, 2010Applicant: Schlumberger Technology CorporationInventors: Henri-Pierre Valero, Sandip Bose, Qiuhua Liu, Ramachandra Shenoy, Abderrhamane Ounadjela
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Publication number: 20100202252Abstract: A multimode acoustic source device for disposition in a borehole formed in a subterranean formation is aligned along an axial axis of the borehole and has a plurality of radiating plates circumferentially disposed about the axial axis. A drive mechanism is proposed to independently and reversibly move each radiating plate from a first position to a second position in a direction transverse to the axial axis. This enables the multimode source to generate each of several azimuthal modes for logging a subterranean formation.Type: ApplicationFiled: February 9, 2009Publication date: August 12, 2010Applicant: Schlumberger Technology CorporationInventors: Abderrhamane Ounadjela, Marthe Souquiere, Henri Pierre Valero, Sandip Bose
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Publication number: 20100177594Abstract: Methods and related systems are described for modified semblance criterions based on the approach of thresholding the signal energy. A first criterion is derived by posing the problem as that of detecting a signal with energy (or amplitude) greater than the specified threshold and deriving the generalized likelihood ratio test statistic. A second criterion is derived using the same method by posing the problem as that of rejecting any signal with energy (or amplitude) below a specified threshold and detecting it if its energy is above another threshold greater than or equal to the first. These appropriately modify the original semblance criterion which is shown to be equivalent to the GLRT test statistic in the absence of any threshold on the signal amplitude. In addition simpler modifications are also described. Tests on synthetic data illustrate the effectiveness of all these modifications which perform comparably well at suppressing unwanted arrivals while accurately processing the desired signals.Type: ApplicationFiled: January 13, 2009Publication date: July 15, 2010Applicant: Schlumberger Technology CorporationInventors: Sandip Bose, Alain Dumont, Henri Pierre Valero
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Publication number: 20100157731Abstract: Slowness dispersion characteristics of multiple possibly interfering signals in broadband acoustic waves as received by an array of two or more sensors are extracted without using a physical model. The problem of dispersion extraction is mapped to the problem of reconstructing signals having a sparse representation in an appropriately chosen over-complete dictionary of basis elements. A sparsity penalized signal reconstruction algorithm is described where the sparsity constraints are implemented by imposing a l1 norm type penalty. The candidate modes that are extracted are consolidated by means of a clustering algorithm to extract phase and group slowness estimates at a number of frequencies which are then used to reconstruct the desired dispersion curves. These estimates can be further refined by building time domain propagators when signals are known to be time compact, such as by using the continuous wavelet transform.Type: ApplicationFiled: December 22, 2009Publication date: June 24, 2010Inventors: Shuchin Aeron, Sandip Bose, Henri-Pierre Valero, Venkatesh Saligrama
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Patent number: 7649805Abstract: This invention pertains to the extraction of the slowness dispersion characteristics of acoustic waves received by an array of two or more sensors by the application of a continuous wavelet transform on the received array waveforms (data). This produces a time-frequency map of the data for each sensor that facilitates the separation of the propagating components thereon. Two different methods are described to achieve the dispersion extraction by exploiting the time frequency localization of the propagating mode and the continuity of the dispersion curve as a function of frequency. The first method uses some features on the modulus map such as the peak to determine the time locus of the energy of each mode as a function of frequency. The second method uses a new modified Radon transform applied to the coefficients of the time frequency representation of the waveform traces received by the aforementioned sensors.Type: GrantFiled: September 12, 2007Date of Patent: January 19, 2010Assignee: Schlumberger Technology CorporationInventors: Sandip Bose, Henri-Pierre Valero, Shuchin Aeron
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Publication number: 20090238037Abstract: A method facilitating radial profiling of acoustic slowness of a formation traversed by a borehole is disclosed. According to some aspects of the invention, a 3D image of near, far, and intermediate formation slowness is provided.Type: ApplicationFiled: June 1, 2009Publication date: September 24, 2009Applicant: Schlumberger Technology CorporationInventors: Smaine Zeroug, Henri-Pierre Valero, Sandip Bose
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Patent number: 7558153Abstract: Methods and apparatus facilitating radial profiling of acoustic slowness of a formation traversed by a borehole are disclosed. According to some aspects of the invention, a radial slowness profile is imaged, including an image of altered region slowness.Type: GrantFiled: November 23, 2005Date of Patent: July 7, 2009Assignee: Schlumberger Technology CorporationInventors: Smaine Zeroug, Henri-Pierre Valero, Sandip Bose
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Publication number: 20090067286Abstract: This invention pertains to the extraction of the slowness dispersion characteristics of acoustic waves received by an array of two or more sensors by the application of a continuous wavelet transform on the received array waveforms (data). This produces a time-frequency map of the data for each sensor that facilitates the separation of the propagating components thereon. Two different methods are described to achieve the dispersion extraction by exploiting the time frequency localization of the propagating mode and the continuity of the dispersion curve as a function of frequency. The first method uses some features on the modulus map such as the peak to determine the time locus of the energy of each mode as a function of frequency. The second method uses a new modified Radon transform applied to the coefficients of the time frequency representation of the waveform traces received by the aforementioned sensors.Type: ApplicationFiled: September 12, 2007Publication date: March 12, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Sandip Bose, Henri Pierre Valero, Shuchin Aeron
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Patent number: 7302346Abstract: A device and method for determining a geophysical characteristic of a borehole using at least one logging device is provided, wherein the at least one logging device includes at least one sensing device. The method includes associating the at least one sensing device with the borehole, wherein the at least one sensing device includes a sensing device measurement length. The method also includes operating the at least one sensing device to generate borehole data responsive to a borehole portion disposed essentially adjacent the sensing device measurement length, wherein the borehole data includes start time of scan, location of the at least one sensing device at start time of scan, stop time of scan and location of the at least one sensing device at stop time of scan. Furthermore, the method includes correlating the borehole data to determine the geophysical characteristic.Type: GrantFiled: December 19, 2005Date of Patent: November 27, 2007Assignee: Schlumberger Technology CorporationInventors: Chung Chang, Marwan Moufarrej, Sandip Bose, Tarek Habashy