Patents by Inventor Bikash Sinha
Bikash 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: 10809400Abstract: A technique includes receiving data acquired by an acoustic measurement tool in a well, where the data represents multiple acoustic modes, including a first order formation flexural acoustic mode and a higher order formation flexural acoustic mode. The technique includes processing the data to identify the higher order formation flexural acoustic mode; and determining a shear slowness based at least in part on slowness values that are associated with the identified higher order formation flexural acoustic mode.Type: GrantFiled: October 24, 2016Date of Patent: October 20, 2020Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Pu Wang, Sandip Bose, Bikash Sinha
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Publication number: 20170115414Abstract: A technique includes receiving data acquired by an acoustic measurement tool in a well, where the data represents multiple acoustic modes, including a first order formation flexural acoustic mode and a higher order formation flexural acoustic mode. The technique includes processing the data to identify the higher order formation flexural acoustic mode; and determining a shear slowness based at least in part on slowness values that are associated with the identified higher order formation flexural acoustic mode.Type: ApplicationFiled: October 24, 2016Publication date: April 27, 2017Inventors: Pu Wang, Sandip Bose, Bikash Sinha
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Patent number: 9097819Abstract: A method for thermoelastic logging in a borehole of a subterranean formation. The method includes generating, by a computer processor, a reference dispersion based on a borehole wave dispersion measurement of the borehole, wherein the reference dispersion represents far-field elastic properties in the subterranean formation, analyzing, by the computer processor, a difference between the reference dispersion and the borehole wave dispersion measurement based on a thermoelastic model of the subterranean formation to generate an analysis result, and determining, by the computer processor and based on the analysis result, a temperature dependent parameter of the subterranean formation.Type: GrantFiled: December 13, 2012Date of Patent: August 4, 2015Assignee: Schlumberger Technology CorporationInventor: Bikash Sinha
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Patent number: 8831923Abstract: Described is method and system of determining horizontal stress from radial profiles of dipole shear together with the far-field estimate of the Stoneley shear modulus. The system and method include selecting an optimal number of regression points on measured radial profiles for obtaining reliable estimation of maximum and minimum horizontal stress magnitudes in the presence of noisy data, where measured radial profiles of dipole shear moduli might exhibit a small amount of random fluctuations.Type: GrantFiled: September 28, 2010Date of Patent: September 9, 2014Assignee: Schlumberger Technology CorporationInventors: Ting Lei, Bikash Sinha
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Publication number: 20110077920Abstract: Described is method and system of determining horizontal stress from radial profiles of dipole shear together with the far-field estimate of the Stoneley shear modulus. The system and method include selecting an optimal number of regression points on measured radial profiles for obtaining reliable estimation of maximum and minimum horizontal stress magnitudes in the presence of noisy data, where measured radial profiles of dipole shear moduli might exhibit a small amount of random fluctuations.Type: ApplicationFiled: September 28, 2010Publication date: March 31, 2011Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Ting Lei, Bikash Sinha
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Publication number: 20090009036Abstract: A pressure transducer for high-pressure measurements comprising a housing and a piezoelectric resonator located in the housing, wherein the resonator comprises double rotation cut piezoelectric material configured or designed for vibrating in the fundamental tone of dual modes of the fast and slow thickness-shear vibrations.Type: ApplicationFiled: July 2, 2007Publication date: January 8, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: NORIYUKI MATSUMOTO, TSUTOMU YAMATE, BIKASH SINHA, SHIGERU SATO, ANTHONY FRANK VENERUSO, JIMMY LAWRENCE, YVES BARRIOL, SHIGEO DAITO
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Publication number: 20070268782Abstract: Methods and apparatus facilitating measurement of anisotropy are disclosed. According to some aspects, anisotropy can be determined while drilling. Monopole/quadrupole interactions, as well as monitoring dipole excitations and other methods, may be used to find the principal shear directions of a formation while drilling or during wireline or other operations.Type: ApplicationFiled: March 7, 2006Publication date: November 22, 2007Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION, Incorporated in the State of TexasInventors: Jahir Pabon, Chaur-Jian Hsu, Bikash Sinha
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Publication number: 20060285437Abstract: Methods and apparatus facilitating radial profiling of formation mobility are disclosed. Radial profiling of formation mobility aids in an optimal completion of a well for enhanced production. Some aspects of the present invention provide a technique for radial profiling of formation mobility based on inverting differences between a Stoneley radial profile of horizontal shear slowness and a dipole radial profile of vertical shear slowness for a reservoir interval.Type: ApplicationFiled: June 3, 2005Publication date: December 21, 2006Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Bikash Sinha, Badarinadh Vissapragada
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Publication number: 20060256656Abstract: Methods and apparatus facilitating radial profiling of shear slowness or shear modulus c66 in the cross-sectional plane of a borehole in an anisotropic formation with the vertical X3-axis are disclosed. According to some aspects of the invention, sonic tool bias is accounted for and removed from radial profiles. According to some aspects, sonic tool bias is accounted for by modeling the sonic tool as a heavy-fluid.Type: ApplicationFiled: May 10, 2005Publication date: November 16, 2006Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Bikash Sinha, Jahir Pabon, Mare Yamamoto
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Publication number: 20060256655Abstract: Methods and apparatus facilitating radial profiling of shear slowness are disclosed. According to some aspects of the invention, acoustic tool bias is accounted for in the calculation of radial profiles. According so some aspects, acoustic tool bias is accounted for by replacing acoustic tool structure with a resonance-impedance model. The resonance-impedance modeling according to principles of the present invention is applicable to vertical, deviated, and horizontal boreholes.Type: ApplicationFiled: May 10, 2005Publication date: November 16, 2006Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION, Incorporated in the State of TexasInventors: Bikash Sinha, Toru Ikegami, David Johnson, Jahir Pabon
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Publication number: 20060235618Abstract: A method for obtaining high-quality well logging data acquired during a drilling operation includes acquiring well logging data during a pump-off period when a mud pump is turned off; and extracting a subset of data from the acquired well logging data, wherein the subset of data corresponds to a quiet period within the pump-off period, wherein the quiet period is substantially free of interference from turning the mud pump on or off.Type: ApplicationFiled: March 7, 2006Publication date: October 19, 2006Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: PETER WU, ANDREW HAWTHORN, TOM BRATTON, BIKASH SINHA
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Publication number: 20060235617Abstract: A method for monitoring a formation property includes determining at least two slowness values from at least two datasets each characterizing an acoustic wave having a different frequency traversing a formation; and deriving an indicator based on the at least two slowness values. A system for monitoring a formation property includes a process and a memory, wherein the memory stores a program having instructions for: determining at least two slowness values from at least two datasets each characterizing an acoustic wave having a different frequency traversing a formation; and deriving an indicator based on the at least two slowness values.Type: ApplicationFiled: March 6, 2006Publication date: October 19, 2006Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: BIKASH SINHA, PETER WU, JAMES THOMPSON
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Publication number: 20050254343Abstract: A method for processing acoustic data comprising applying a dynamic filter band. The method and apparatus may be particularly adapted to processing sonic data to measure formation slowness in a borehole.Type: ApplicationFiled: May 17, 2004Publication date: November 17, 2005Inventors: Yoshiyuki Saiki, Oliver Skelton, Jahir Pabon, Bikash Sinha
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Publication number: 20050065730Abstract: A method for determining the maximum and minimum horizontal stresses of formations surrounding a borehole includes the following steps: suspending a logging device in the borehole; transmitting sonic energy from the logging device to establish flexural waves in the formations; receiving, at the logging device, sonic energy from the flexural waves, and producing, from the received sonic energy, measurement signals at a number of frequencies; determining, at the number of frequencies, the fast and slow flexural wave velocities in the formations, to obtain fast and slow flexural velocity dispersions; establishing a model of formation stresses in which stresses of a loaded state are represented by the sum of an omnidirectional hydrostatically loaded mean reference stress, a vertical stress perturbation, and maximum and minimum horizontal stress perturbations; establishing an inversion model that includes inputs from the fast and slow flexural velocity dispersions and also includes unknown horizontal perturbationsType: ApplicationFiled: September 18, 2003Publication date: March 24, 2005Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventor: Bikash Sinha
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Publication number: 20050000688Abstract: A tool generates signals indicative a shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveform received at a second location. Formation shear wave slowness is calculated using dispersive slowness time coherence processing.Type: ApplicationFiled: September 9, 2002Publication date: January 6, 2005Inventors: Chaur-Jian Hsu, Jahir Pabon, Bikash Sinha, Sergey Asvadurov
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Patent number: 6631327Abstract: A tool generates signals indicative of shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter. A method determines shear wave slowness of the formation. The method includes propagating quadrupole wave energy into the formation and detecting quadrupole dispersive waveforms received at a second location.Type: GrantFiled: September 21, 2001Date of Patent: October 7, 2003Assignee: Schlumberger Technology CorporationInventors: Chaur-Jian Hsu, Jahir A. Pabon, Bikash A. Sinha
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Publication number: 20030058739Abstract: A tool generates signals indicative of shear wave slowness of the formation surrounding a borehole. The tool comprises a collar portion adapted for mounting in a drill string, a quadrupole sonic transmitter mounted to the collar portion, and a quadrupole sonic receiver array mounted to the collar spaced apart from the transmitter.Type: ApplicationFiled: September 21, 2001Publication date: March 27, 2003Inventors: Chaur-Jian Hsu, Jahir A. Pabon, Bikash A. Sinha
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Patent number: 6510389Abstract: A method provides for locating and measuring mechanical damage in rock surrounding a borehole by detecting one or both of reductions in ultrasonic compressional wave velocity in the rock as a function of azimuth, and by detecting focused acoustic energy in the rock from local increases in ultrasonic compressional wave amplitude resulting from velocity gradients. A first preferred embodiment uses a combination of azimuthal ultrasonic compressional wave velocity data and azimuthal ultrasonic compressional wave energy data. A second embodiment uses azimuthal ultrasonic compressional wave velocity data and omni-directional sonic velocity data, with a comparison test or a curve fitting test. A third embodiment uses azimuthal ultrasonic compressional wave energy data.Type: GrantFiled: February 25, 2000Date of Patent: January 21, 2003Assignee: Schlumberger Technology CorporationInventors: Kenneth W. Winkler, Thomas J. Plona, Bikash Sinha, Ralph M. D'Angelo, Lawrence McGowan