Patents by Inventor Bikash Kumar Sinha
Bikash Kumar Sinha 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: 11835673Abstract: Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.Type: GrantFiled: September 13, 2021Date of Patent: December 5, 2023Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Pu Wang, Sandip Bose, Bikash Kumar Sinha, Ting Lei
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Patent number: 11624849Abstract: A method for estimating all five transversely-isotropic (TI)-elastic constants using borehole sonic data obtained from at least one subterranean borehole in a transversely isotropic formation. In an embodiment, the method includes: solving for a quasi-compressional qP-wave velocity VqP using inversion algorithms based on exact solutions of the Kelvin-Christoffel equations for plane wave velocities in arbitrarily anisotropic formations, where the five TI-elastic constants may include C11, C13, C33, C55, and C66.Type: GrantFiled: May 14, 2018Date of Patent: April 11, 2023Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Austin Boyd, Vanessa Simoes, Bikash Kumar Sinha, Smaine Zeroug, Anna Paula Lougon Duarte
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Publication number: 20220075087Abstract: Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.Type: ApplicationFiled: September 13, 2021Publication date: March 10, 2022Inventors: Pu Wang, Sandip Bose, Bikash Kumar Sinha, Ting Lei
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Patent number: 11119237Abstract: Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.Type: GrantFiled: April 13, 2017Date of Patent: September 14, 2021Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Pu Wang, Sandip Bose, Bikash Kumar Sinha, Ting Lei
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Patent number: 11015443Abstract: Methods and systems are provided that identify relatively large anisotropic horizontal stresses in a formation based on (i) azimuthal variations in the compressional and shear slownesses or velocities of the formation measured from ultrasonic data acquired by at least one acoustic logging tool as well as (ii) cross-dipole dispersions of the formation measured from sonic data acquired by the at least one acoustic logging tool. In addition, the azimuthal variations in the compressional and shear slownesses or velocities of the formation and dipole flexural dispersions of the formation can be jointly inverted to obtain the elastic properties of the rock of the formation in terms of linear and nonlinear constants and the magnitude of maximum horizontal stress of the formation. A workflow for estimating the magnitude of the maximum horizontal stress can employ estimates of certain formation properties, such as overburden stress, magnitude of minimum horizontal stress, and pore pressure.Type: GrantFiled: May 31, 2017Date of Patent: May 25, 2021Assignee: Schlumberger Technology CorporationInventors: Ting Lei, Smaine Zeroug, Bikash Kumar Sinha
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Patent number: 10995606Abstract: Methods arc provided for using sonic tool data to investigate a multi-string wcllbore. The sonic data is processed to obtain indications of phase slowness dispersions for multiple locations in the wellbore. The dispersions are aggregated. The aggregated dispersions are compared with a plurality of cut-off mode templates to identify the presence of cut-off modes or the lack thereof in the aggregated phase slowness dispersions. Features of the multi-string wellbore are identified based on the presence of the cut-off modes or the lack thereof. In another method, the sonic data is processed to obtain indications as a function of depth of at least one of an energy spectrum, a semblance projection, a slowness dispersion projection, an attenuation dispersion projection, and a wavenumber dispersion projection. The indications are inspected to locate a shift at a particular depth indicat- ing a transition in at least oneannulus of the multi-string wellbore.Type: GrantFiled: March 2, 2017Date of Patent: May 4, 2021Assignee: Schlumberger Technology CorporationInventors: Maja Skataric, Sandip Bose, Smaine Zeroug, Bikash Kumar Sinha, Ram Sunder Kalyanaraman, Erik Wielemaker
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Patent number: 10890681Abstract: Methods and systems are provided for determining cement quality in an outer annulus of a multi-string cased wellbore having an inner annulus of mud. Data from a sonic logging tool is processed to obtain a slowness dispersion. The slowness dispersion is compared to a plurality of model slowness dispersions generated for a plurality of different values for cement quality in the outer annulus. The cement quality in the outer annulus is determined based on the comparison.Type: GrantFiled: May 18, 2016Date of Patent: January 12, 2021Assignee: Schlumberger Technology CorporationInventors: Ting Lei, Bikash Kumar Sinha, Smaine Zeroug
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Patent number: 10858933Abstract: The present disclosure provides methods and systems for analyzing cement integrity in a depth interval of a wellbore having a multiple string casing with an innermost annulus disposed inside at least one outer annulus. The method includes processing ultrasonic data obtained from ultrasonic measurements on the interval of the wellbore to determine properties of the innermost annulus. The method also includes processing sonic data obtained from sonic measurements on the interval of the wellbore to extract features of the sonic data. The features of the sonic data are input to a machine learning processing to determine properties of both the innermost annulus and the least one outer annulus. Additional processing of ultrasonic and sonic data can also be used to determine properties of both the innermost annulus and the least one outer annulus. These properties can be used to analyze cement integrity in the depth interval of the wellbore.Type: GrantFiled: May 18, 2016Date of Patent: December 8, 2020Assignee: Schlumberger Technology CorporationInventors: Sandip Bose, Maja Skataric, Smaine Zeroug, Bikash Kumar Sinha
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Patent number: 10809405Abstract: Methods utilizing ultrasonic acoustic logging tools are provided for detecting thin formation layers that present markedly higher compliance than that of the surrounding rock in, for example, a laminated tight hydrocarbon-bearing formation. These layers may be interpreted as presenting potential interfacial and planes of weakness that may have bearing on the extent of a hydraulic fracture propagating across them.Type: GrantFiled: July 5, 2016Date of Patent: October 20, 2020Assignee: Schlumberger Technology CorporationInventors: Smaine Zeroug, Bikash Kumar Sinha, Peter Tilke, George Alan Waters
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Patent number: 10705056Abstract: Methods are provided for identifying a cementation status of a multi-string cased wellbore utilizing sonic tools with monopole and/or dipole transmitters and with an array of sonic receivers axially displaced from the transmitter(s). The sonic tool is used to record waveforms. The waveforms are then processed to generate slowness and/or attenuation dispersions. The slowness and/or attenuation dispersions are projected onto a slowness and/or attenuation axis, and the results are compared to a data set of projected slowness and/or attenuation dispersions representing a plurality of different multi-string cased wellbore cement status scenarios in order to select the scenario most closely associated with the results. The presence or lack of eccentering of a casing is similarly obtained where the data set includes projected dispersions representing properly centered and ec-centered casings.Type: GrantFiled: May 18, 2016Date of Patent: July 7, 2020Assignee: Schlumberger Technology CorporationInventors: Ting Lei, Bikash Kumar Sinha, Smaine Zeroug
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Publication number: 20190346581Abstract: A method for estimating all five transversely-isotropic (TI)-elastic constants using borehole sonic data obtained from at least one subterranean borehole in a transversely isotropic formation. In an embodiment, the method includes: solving for a quasi-compressional qP-wave velocity VqP using inversion algorithms based on exact solutions of the Kelvin-Christoffel equations for plane wave velocities in arbitrarily anisotropic formations, where the five TI-elastic constants may include C11, C13, C33, C55, and C66.Type: ApplicationFiled: May 14, 2018Publication date: November 14, 2019Inventors: Austin Boyd, Vanessa Simoes, Bikash Kumar Sinha, Smaine Zeroug, Anna Paula Lougon Duarte
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Publication number: 20190330981Abstract: Methods and systems are provided that identify relatively large anisotropic horizontal stresses in a formation based on (i) azimuthal variations in the compressional and shear slownesses or velocities of the formation measured from ultrasonic data acquired by at least one acoustic logging tool as well as (ii) cross-dipole dispersions of the formation measured from sonic data acquired by the at least one acoustic logging tool. In addition, the azimuthal variations in the compressional and shear slownesses or velocities of the formation and dipole flexural dispersions of the formation can be jointly inverted to obtain the elastic properties of the rock of the formation in terms of linear and nonlinear constants and the magnitude of maximum horizontal stress of the formation. A workflow for estimating the magnitude of the maximum horizontal stress can employ estimates of certain formation properties, such as overburden stress, magnitude of minimum horizontal stress, and pore pressure.Type: ApplicationFiled: May 31, 2017Publication date: October 31, 2019Inventors: Ting LEI, Smaine ZEROUG, Bikash Kumar SINHA
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Publication number: 20190129053Abstract: Methods are provided for determining properties of an anisotropic formation (including both fast and slow formations) surrounding a borehole. A logging-while-drilling tool is provided that is moveable through the borehole. The logging-while drilling tool has at least one dipole acoustic source spaced from an array of receivers. During movement of the logging-while-drilling tool, the at least one dipole acoustic source is operated to excite a time-varying pressure field in the anisotropic formation surrounding the borehole. The array of receivers is used to measure waveforms arising from the time-varying pressure field in the anisotropic formation surrounding the borehole. The waveforms are processed to determine a parameter value that represents shear directionality of the anisotropic formation surrounding the borehole.Type: ApplicationFiled: April 13, 2017Publication date: May 2, 2019Inventors: Pu Wang, Sandip Bose, Bikash Kumar Sinha, Ting Lei
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Publication number: 20190055830Abstract: Methods arc provided for using sonic tool data to investigate a multi-string wcllbore. The sonic data is processed to obtain indications of phase slowness dispersions for multiple locations in the wellbore. The dispersions are aggregated. The aggregated dispersions are compared with a plurality of cut-off mode templates to identify the presence of cut-off modes or the lack thereof in the aggregated phase slowness dispersions. Features of the multi-string wellbore are identified based on the presence of the cut-off modes or the lack thereof. In another method, the sonic data is processed to obtain indications as a function of depth of at least one of an energy spectrum, a semblance projection, a slowness dispersion projection, an attenuation dispersion projection, and a wavenumber dispersion projection. The indications are inspected to locate a shift at a particular depth indicat- ing a transition in at least oneannulus of the multi-string wellbore.Type: ApplicationFiled: March 2, 2017Publication date: February 21, 2019Inventors: Maja Skataric, Sandip Bose, Smaine Zeroug, Bikash Kumar Sinha, Ram Sunder Kalyanraman, Erik Wielemaker
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Publication number: 20180196157Abstract: Methods utilizing ultrasonic acoustic logging tools are provided for detecting thin formation layers that present markedly higher compliance than that of the surrounding rock in, for example, a laminated tight hydrocarbon-bearing formation. These layers may be interpreted as presenting potential interfacial and planes of weakness that may have bearing on the extent of a hydraulic fracture propagating across them.Type: ApplicationFiled: July 5, 2016Publication date: July 12, 2018Inventors: Smaine ZEROUG, Bikash Kumar SINHA, Peter TILKE, George Alan WATERS
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Publication number: 20180156759Abstract: Methods are provided for identifying a cementation status of a multi-string cased wellbore utilizing sonic tools with monopole and/or dipole transmitters and with an array of sonic receivers axially displaced from the transmitter(s). The sonic tool is used to record waveforms. The waveforms are then processed to generate slowness and/or attenuation dispersions. The slowness and/or attenuation dispersions are projected onto a slowness and/or attenuation axis, and the results are compared to a data set of projected slowness and/or attenuation dispersions representing a plurality of different multi-string cased wellbore cement status scenarios in order to select the scenario most closely associated with the results. The presence or lack of eccentering of a casing is similarly obtained where the data set includes projected dispersions representing properly centered and ec-centered casings.Type: ApplicationFiled: May 18, 2016Publication date: June 7, 2018Inventors: Ting LEI, Bikash Kumar SINHA, Smaine ZEROUG
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Publication number: 20180142545Abstract: Methods and systems are provided for determining cement quality in an outer annulus of a multi-string cased wellbore having an inner annulus of mud. Data from a sonic logging tool is processed to obtain a slowness dispersion. The slowness dispersion is compared to a plurality of model slowness dispersions generated for a plurality of different values for cement quality in the outer annulus. The cement quality in the outer annulus is determined based on the comparison.Type: ApplicationFiled: May 18, 2016Publication date: May 24, 2018Inventors: Ting LEI, Bikash Kumar SINHA, Smaine ZEROUG
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Patent number: 6904365Abstract: Systems and methods for determining a formation property related to formation strength and stresses are disclosed. A method for determining a formation strength includes obtaining radial formation property measurements at different wellbore pressures; generating a radial stress profile based on a formation model; generating a radial stress function from the radial stress profile; and comparing the radial formation property measurements with the radial stress function to determine the formation strength. A method for determining a formation stress profile includes deriving formation parameters from a formation radial profiling; obtaining formation log data that comprise formation density data; estimating formation stresses from the formation log data; and deriving a radial stress profile based on a formation model, the derived formation parameters, and the estimated formation stresses.Type: GrantFiled: October 6, 2003Date of Patent: June 7, 2005Assignee: Schlumberger Technology CorporationInventors: Tom R. Bratton, Bikash Kumar Sinha, Thomas J. Plona, Benjamin P. Jeffryes
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Publication number: 20040176911Abstract: Systems and methods for determining a formation property related to formation strength and stresses are disclosed. A method for determining a formation strength includes obtaining radial formation property measurements at different wellbore pressures; generating a radial stress profile based on a formation model; generating a radial stress function from the radial stress profile; and comparing the radial formation property measurements with the radial stress function to determine the formation strength. A method for determining a formation stress profile includes deriving formation parameters from a formation radial profiling; obtaining formation log data that comprise formation density data; estimating formation stresses from the formation log data; and deriving a radial stress profile based on a formation model, the derived formation parameters, and the estimated formation stresses.Type: ApplicationFiled: October 6, 2003Publication date: September 9, 2004Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Tom R. Bratton, Bikash Kumar Sinha, Thomas J. Plona, Benjamin P. Jeffryes