Patents by Inventor Pabitra N. Sen
Pabitra N. Sen 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: 10590763Abstract: Hydraulic fracturing of a geological formation is performed by injection of a proppant mixture into the geological formation to form fractures in the geological formation. The proppant mixture includes at least a liquid, proppant, and proppant additive particles. The hydraulic fracturing results in a presence of the proppant additive particles within the formed fractures, wherein the proppant additive particles are configured with a first complex conductivity that is measurably different than a second complex conductivity exhibited by materials comprising the geological formation. The formed fractures can then be imaged and mapped in the geological formation with electromagnetic energy at one or more frequencies in a manner so that the proppant additive particles function as a contrast agent due to the first complex conductivity of the proppant additive particles being measurably different from the second complex conductivity.Type: GrantFiled: December 11, 2017Date of Patent: March 17, 2020Assignees: THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL, BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM, STATOIL GULF SERVICES LLCInventors: Pabitra N. Sen, Alfred Kleinhammes, Yue Wu, Michele O'Callaghan, Mohsen Ahmadian-Tehrani
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Publication number: 20180100389Abstract: Hydraulic fracturing of a geological formation is performed by injection of a proppant mixture into the geological formation to form fractures in the geological formation. The proppant mixture includes at least a liquid, proppant, and proppant additive particles. The hydraulic fracturing results in a presence of the proppant additive particles within the formed fractures, wherein the proppant additive particles are configured with a first complex conductivity that is measurably different than a second complex conductivity exhibited by materials comprising the geological formation. The formed fractures can then be imaged and mapped in the geological formation with electromagnetic energy at one or more frequencies in a manner so that the proppant additive particles function as a contrast agent due to the first complex conductivity of the proppant additive particles being measurably different from the second complex conductivity.Type: ApplicationFiled: December 11, 2017Publication date: April 12, 2018Applicants: THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL, BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM, STATOIL GULF SERVICES LLCInventors: Pabitra N. Sen, Alfred Kleinhammes, Yue Wu, Michele O'Callaghan, Mohsen Ahmadian-Tehrani
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Patent number: 9176081Abstract: Systems and methods for magic angle spinning nuclear magnetic resonance analysis of samples from unconventional reservoirs are described. Fast and inexpensive methods are described that can provide reliable information on TOC content, type, and maturity (via the relative abundances of different hydrocarbons, for example) without the need for more extensive sample preparation or destruction. If care is taken during sample recovery and storage, NMR can also yield an estimate of gas-in-place, including detailed typing (e.g. methane vs. ethane). The described MAS NMR analysis is used to determine various properties of unconventional reservoirs, including gas and oil shales, which are useful in evaluating their worth and producibility.Type: GrantFiled: April 29, 2011Date of Patent: November 3, 2015Assignee: Schlumberger Technology CorporationInventors: Pabitra N. Sen, Gabriela Leu, Nicholas Drenzek, Thomas J. Neville, Yi-Qiao Song, Ravinath Kausik Kadayam Viswanathan
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Patent number: 8884623Abstract: A method for determining the frequency-dependent dielectric permittivity spectrum of a rock sample, comprising:—defining a series of electromagnetic measurement data comprising at least a first measurement at a frequency from which a substantially frequency-independent value of dielectric permittivity ??, can be obtained; and at least second and third measurements at different frequencies from which values for frequency-dependent dielectric permittivity ?rock (f) can be obtained; and—using the first, second and third measurements to determine the frequency-dependent spectrum of the sample.Type: GrantFiled: March 25, 2010Date of Patent: November 11, 2014Assignee: Schlumberger Technology CorporationInventors: Barbara Anderson, Thomas D. Barber, Emmanuel Legendre, Martin G. Luling, Pabitra N. Sen, Reza Taherian
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Publication number: 20120273193Abstract: Systems and methods for magic angle spinning nuclear magnetic resonance analysis of samples from unconventional reservoirs are described. Fast and inexpensive methods are described that can provide reliable information on TOC content, type, and maturity (via the relative abundances of different hydrocarbons, for example) without the need for more extensive sample preparation or destruction. If care is taken during sample recovery and storage, NMR can also yield an estimate of gas-in-place, including detailed typing (e.g. methane vs. ethane). The described MAS NMR analysis is used to determine various properties of unconventional reservoirs, including gas and oil shales, which are useful in evaluating their worth and producibility.Type: ApplicationFiled: April 29, 2011Publication date: November 1, 2012Applicant: Schlumberger Technology CorporationInventors: Pabitra N. Sen, Gabriela Leu, Nicholas Drenzek, Thomas J. Neville, Yi-Qiao Song, Ravinath Kausik Kadayam Viswanathan
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Publication number: 20120153958Abstract: A method for determining the frequency-dependent dielectric permittivity spectrum of a rock sample, comprising:—defining a series of electromagnetic measurement data comprising at least a first measurement at a frequency from which a substantially frequency-independent value of dielectric permittivity ??, can be obtained; and at least second and third measurements at different frequencies from which values for frequency-dependent dielectric permittivity ?rock (f) can be obtained; and—using the first, second and third measurements to determine the frequency-dependent spectrum of the sample.Type: ApplicationFiled: March 25, 2010Publication date: June 21, 2012Inventors: Barbara Anderson, Thomas D. Barber, Emmanuel Legendre, Martin G. Luling, Pabitra N. Sen, Reza Taherian
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Patent number: 8096354Abstract: Methods and related systems for use with a wireline tool system. A wireline cable designed to deploy a wireline tool into a wellbore from a surface. The wireline cable includes one or more conducting members for communication between the wireline tool and the surface. A plurality of sensing elements located on the wireline cable in a spaced apart fashion along a length of the wireline cable, wherein each sensing element is in communication with one or more adjacent sensing element.Type: GrantFiled: May 15, 2008Date of Patent: January 17, 2012Assignee: Schlumberger Technology CorporationInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Patent number: 7942202Abstract: Methods and related systems for use with a continuous fiber based system for use with well bore completions. Wherein a plurality of continuous fibers are deployable into a portion of a well bore completion, such that a fiber management module is adapted and positioned within the borehole to facilitate deployment of and communication with the plurality of continuous fibers. Further, the number of deployable continuous fibers of the continuous fiber based system can provide for sufficient redundancy to make at least a target measurement relating to the completion.Type: GrantFiled: May 15, 2008Date of Patent: May 17, 2011Assignee: Schlumberger Technology CorporationInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Patent number: 7926562Abstract: Methods and related systems are described for use with hydraulic fracturing and other oilfield applications. A tool body is positioned in a wellbore at a location near a subterranean rock formation being fractured. The tool body contains a plurality of deployable continuous fibers. At least some of the deployable continuous fibers are deployed into fractures within a subterranean rock formation. Each deployed fiber is continuous from the tool body to the rock formation. The number of deployable continuous fibers provides sufficient redundancy to make at least a target measurement relating to the fracturing process.Type: GrantFiled: May 15, 2008Date of Patent: April 19, 2011Assignee: Schlumberger Technology CorporationInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Patent number: 7852708Abstract: Methods and related systems are described for use with hydraulic fracturing and other oilfield applications. A tool body is positioned in a wellbore at a location near a subterranean rock formation being fractured. The tool body contains a plurality of deployable continuous fibers. At least some of the deployable continuous fibers are deployed into fractures within a subterranean rock formation. Each deployed fiber is continuous from the tool body to the rock formation. The number of deployable continuous fibers provides sufficient redundancy to make at least a target measurement relating to the fracturing process.Type: GrantFiled: May 15, 2008Date of Patent: December 14, 2010Assignee: Schlumberger Technology CorporationInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Publication number: 20090283259Abstract: Methods and related systems are described for use with a wireline tool system including a wireline cable designed to deploy a wireline tool into a wellbore from the surface, the wireline cable having one or more conducting members for communication between the wireline tool and the surface; and a plurality of sensing elements located on the wireline cable in a spaced apart fashion along substantially the entire length of the wireline cable, each sensing element being in communication with one or more adjacent sensing elements.Type: ApplicationFiled: May 15, 2008Publication date: November 19, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Publication number: 20090283261Abstract: Methods and related systems are described for use with continuous fiber based system for use with well bore completions comprising: a plurality of continuous fibers deployable into a portion of a well bore completion; a fiber management module adapted and positioned within the borehole to facilitate deployment of and communication with the plurality of continuous fibers; wherein the number of deployable continuous fibers provides sufficient redundancy to make at least a target measurement relating to the completion.Type: ApplicationFiled: May 15, 2008Publication date: November 19, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Publication number: 20090285051Abstract: Methods and related systems are described for use with hydraulic fracturing and other oilfield applications. A tool body is positioned in a wellbore at a location near a subterranean rock formation being fractured. The tool body contains a plurality of deployable continuous fibers. At least some of the deployable continuous fibers are deployed into fractures within a subterranean rock formation. Each deployed fiber is continuous from the tool body to the rock formation. The number of deployable continuous fibers provides sufficient redundancy to make at least a target measurement relating to the fracturing process.Type: ApplicationFiled: May 15, 2008Publication date: November 19, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Publication number: 20090283258Abstract: Methods and related systems are described for use with hydraulic fracturing and other oilfield applications. A tool body is positioned in a wellbore at a location near a subterranean rock formation being fractured. The tool body contains a plurality of deployable continuous fibers. At least some of the deployable continuous fibers are deployed into fractures within a subterranean rock formation. Each deployed fiber is continuous from the tool body to the rock formation. The number of deployable continuous fibers provides sufficient redundancy to make at least a target measurement relating to the fracturing process.Type: ApplicationFiled: May 15, 2008Publication date: November 19, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Martin E. Poitzsch, Pabitra N. Sen, Karen Wiemer, Guillemette Picard, Muthusamy Vembusubramanian
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Patent number: 7528600Abstract: A system and method for measuring fluid flow in a wellbore in an earth formation using time-of-flight (TOF) sensing and remote detection nuclear magnetic resonance (NMR) techniques, by applying a magnetic field to the formation to polarize spins present in a portion of the formation, providing an encoding shell in the formation, selecting an encoding volume from the encoding shell, applying an encoding signal to excite the spins in the encoding volume, introducing a time delay to the encoding signal, providing a detection shell in the formation, applying a detection signal to the detection shell, detecting an NMR signal generated by the migration of spins from the encoding shell to the detection shell, and collecting TOF data corresponding to time elapsed from when a spin is encoded to when the spin reaches the detection shell.Type: GrantFiled: December 8, 2006Date of Patent: May 5, 2009Assignee: Schlumberger Technology CorporationInventors: Pabitra N. Sen, Yi-Qiao Song, John P. Horkowitz
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Publication number: 20080136409Abstract: A system and method for measuring fluid flow in a wellbore in an earth formation using time-of-flight (TOF) sensing and remote detection nuclear magnetic resonance (NMR) techniques, by applying a magnetic field to the formation to polarize spins present in a portion of the formation, providing an encoding shell in the formation, selecting an encoding volume from the encoding shell, applying an encoding signal to excite the spins in the encoding volume, introducing a time delay to the encoding signal, providing a detection shell in the formation, applying a detection signal to the detection shell, detecting an NMR signal generated by the migration of spins from the encoding shell to the detection shell, and collecting TOF data corresponding to time elapsed from when a spin is encoded to when the spin reaches the detection shell.Type: ApplicationFiled: December 8, 2006Publication date: June 12, 2008Inventors: Pabitra N. Sen, Yi-Qiao Song, John P. Horkowitz
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Patent number: 6522136Abstract: A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the formations, from the logging device, a magnetic pulse sequence and receiving, during the pulse sequence, magnetic resonance spin echo signals; the magnetic pulse sequence having a portion of a pulse acquisition sequence with relatively long pulse spacing times tE,1 and another portion of the pulse acquisition sequence with relatively short pulse spacing times tE,2; and (d) repeating step (c) with pulse spacing times tE,2 that are different than tE,2;(e) deriving respective T2 distributions from the spin echo signals obtained during the another portion of the pulse acquisition sequence of step (c) and during the another portion of the pulse acquisition sequence of step (d); and (f) determining the characteristic of theType: GrantFiled: March 20, 2000Date of Patent: February 18, 2003Assignee: Schlumberger Technology CorporationInventors: Martin D. Hurlimann, Pabitra N. Sen, William E. Kenyon
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Patent number: 6366086Abstract: A method for the determining a nuclear magnetic resonance characteristic of earth formations surrounding a borehole, includes the following steps: providing a logging device that is movable through the borehole, the logging device having a longitudinal axis; providing a first coil, in the logging device, for generating a magnetic field in the formations; providing a second coil in the logging device; applying a polarizing signal to the first coil; detecting, with the second coil, magnetic resonance of spins in the formations that are precessing around earth's magnetic field; and providing a third coil in the logging device, the third coil being operative to produce a further magnetic field in the borehole that reduces the contribution of spins in the borehole to the magnetic resonance detected by the second coil.Type: GrantFiled: November 24, 1998Date of Patent: April 2, 2002Assignee: Schlumberger Technology CorporationInventor: Pabitra N. Sen
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Patent number: 6166543Abstract: The present invention relates generally to an apparatus and method for measuring nuclear magnetic resonance properties of an earth formation traversed by a borehole by generating gradient-echoes. The measurement can be made while drilling or using a wireline tool. The apparatus applies a static magnetic field, B.sub.a, in a volume of the formation which polarizes the nuclei of hydrogenous connate fluids within the formation. The apparatus applies a second magnetic field, B.sub.b, in a volume of the formation. The magnetic fields B.sub.a and B.sub.b are substantially orthogonal in the volume of the formation. A change in the polarity of the magnetic field, B.sub.b, reverses the direction of precession of the nuclei thereby generating a train of gradient-echoes. Each gradient-echo signal is transformed into the frequency domain and the signal frequency is mapped to a radial position in the volume of the formation in order to generate an image of the formation.Type: GrantFiled: September 25, 1997Date of Patent: December 26, 2000Assignee: Schlumberger Technology CorporationInventors: Abdurrahman Sezginer, Pabitra N. Sen, Mohammad Reza Taherian, Boqin Sun
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Patent number: 6133735Abstract: A technique is provided for determining a nuclear magnetic resonance characteristic of formations surrounding an earth borehole, including the following steps: providing a logging device that is moveable through the borehole; providing, on the logging device, first and second coils having respective axes that are generally orthogonal; producing, at the logging device, a prepolarizing signal; applying pulse sequence signals to the first and second coils, the pulse sequence signals implementing repeated refocusing of spins in the formations by both adiabatic and non-adiabatic reorienting of the spins to form spin echoes; and detecting, at the logging device, the spin echoes from the formations, the spin echoes being indicative of the nuclear magnetic resonance characteristic of the formations.Type: GrantFiled: November 24, 1998Date of Patent: October 17, 2000Assignee: Schlumberger Technology CorporationInventors: Martin D. Hurlimann, Yi-Quao Song, Seungoh Ryu, Pabitra N. Sen