Patents by Inventor David Linton Johnson
David Linton Johnson 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: 10859723Abstract: A downhole tool system may include a Stoneley wave emitter, located in a downhole tool, designed to emit Stoneley waves into a borehole. The downhole tool system may include one or more Stoneley wave sensors, located in the downhole tool, and a processor. The processor may be designed to receive signals from the one or more Stoneley wave sensors based on the detection of the Stoneley waves. The processor may use the signals to obtain a temporal measurement of the Stoneley waves. Based at least in part on the temporal measurement, the processor may calculate a distance from the downhole tool or a bottom-hole assembly to the bottom of the borehole.Type: GrantFiled: November 16, 2017Date of Patent: December 8, 2020Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Bertrand du Castel, Christoph Klieber, David Linton Johnson, Martin G. Lüling
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Publication number: 20190146114Abstract: A downhole tool system may include a Stoneley wave emitter, located in a downhole tool, designed to emit Stoneley waves into a borehole. The downhole tool system may include one or more Stoneley wave sensors, located in the downhole tool, and a processor. The processor may be designed to receive signals from the one or more Stoneley wave sensors based on the detection of the Stoneley waves. The processor may use the signals to obtain a temporal measurement of the Stoneley waves. Based at least in part on the temporal measurement, the processor may calculate a distance from the downhole tool or a bottom-hole assembly to the bottom of the borehole.Type: ApplicationFiled: November 16, 2017Publication date: May 16, 2019Inventors: Bertrand du Castel, Christoph Klieber, David Linton Johnson, Martin G. Lüling
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Patent number: 9086508Abstract: 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: GrantFiled: March 23, 2009Date of Patent: July 21, 2015Assignee: Schlumberger Technology CorporationInventors: Bikash K. Sinha, Toru Ikegami, David Linton Johnson, Jahir Pabon
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Patent number: 8773948Abstract: Methods and apparatus to determine slowness of drilling fluid in an annulus are described. An example method of determining slowness of drilling fluid in an annulus of a borehole in a formation includes obtaining a first slowness of the drilling fluid in the annulus and measuring with a downhole tool slownesses of the formation based on the first slowness. The example method also includes determining a first compressibility of the formation based on the slownesses of the formation and a first density of the formation and calculating a second density and a second compressibility of the drilling fluid in the annulus based on the first density and the first compressibility. The method also includes calculating a second slowness of the drilling fluid in the annulus based on the second density and the second compressibility.Type: GrantFiled: September 27, 2011Date of Patent: July 8, 2014Assignee: Schlumberger Technology CorporationInventor: David Linton Johnson
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Patent number: 8730763Abstract: Methods and apparatus to optimize parameters in a downhole environment are described. An example downhole tool includes a transmitter to transmit a signal into a subterranean formation and one or more receivers to receive at least a portion of the acoustic signal. The downhole tool also includes a processor configured to determine slownesses of different acoustic modes at a frequency of the signal received. Each of the slownesses is associated with a first parameter and a second parameter. The different acoustic modes have substantially different sensitivities to at least one of the first parameter or the second parameter. The processor to invert the determined slownesses of the different acoustic modes to determine an optimized value of the first parameter and an optimized value of the second parameter.Type: GrantFiled: May 9, 2011Date of Patent: May 20, 2014Assignee: Schlumberger Technology CorporationInventor: David Linton Johnson
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Publication number: 20140003190Abstract: A method for determining on a real time logging while drilling (LWD) basis gas within earth formations traversed by a borehole. Continuous LWD acoustic measurements are recorded and processed including coherent energy and attenuation attributes to detect downhole gas zones and kick during drilling operations.Type: ApplicationFiled: September 2, 2013Publication date: January 2, 2014Applicant: Schlumberger Technology CorporationInventors: Peter T. Wu, Alain Dumont, Pierre Henri Campanac, David Linton Johnson
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Patent number: 8553493Abstract: A method for estimating formation permeability from measured sonic wave Stoneley attributes and particularly the Stoneley attributes of slowness (DTst) and attenuation (ATTst), taking into consideration the existence of a heavy walled drill collar at the end of the drill string and the relative lack of borehole mud cake during a drilling operation. In the subject LWD application a real-time qualitative indication for fracture and permeable zones is estimated from Stoneley measurements. This information is useful to a driller to make important timely decisions about drilling and completion programs.Type: GrantFiled: December 27, 2007Date of Patent: October 8, 2013Assignee: Schlumberger Technology CorporationInventors: Peter T. Wu, Alain Dumont, Pierre Campanac, David Linton Johnson
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Patent number: 8547789Abstract: A method for determining on a real time logging while drilling (LWD) basis gas within earth formations traversed by a borehole. Continuous LWD acoustic measurements are recorded and processed including coherent energy and attenuation attributes to detect downhole gas zones and kick during drilling operations.Type: GrantFiled: December 27, 2007Date of Patent: October 1, 2013Assignee: Schlumberger Technology CorporationInventors: Peter T. Wu, Alain Dumont, Pierre Campanac, David Linton Johnson
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Publication number: 20130170318Abstract: Illustrative embodiments of the present disclosure are directed to methods and devices for attenuating acoustic signals traveling within bodies. A device includes a body and at least one acoustic attenuator disposed along the body. The attenuator includes a cavity and granular particles disposed within the cavity. A liquid is also disposed within the cavity. A restrictor applies a stress to the granular particles within the cavity.Type: ApplicationFiled: December 29, 2011Publication date: July 4, 2013Inventors: JOHN J. VALENZA, II, DAVID LINTON JOHNSON
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Publication number: 20130075158Abstract: Methods and apparatus to determine slowness of drilling fluid in an annulus are described. An example method of determining slowness of drilling fluid in an annulus of a borehole in a formation includes obtaining a first slowness of the drilling fluid in the annulus and measuring with a downhole tool slownesses of the formation based on the first slowness. The example method also includes determining a first compressibility of the formation based on the slownesses of the formation and a first density of the formation and calculating a second density and a second compressibility of the drilling fluid in the annulus based on the first density and the first compressibility. The method also includes calculating a second slowness of the drilling fluid in the annulus based on the second density and the second compressibility.Type: ApplicationFiled: September 27, 2011Publication date: March 28, 2013Inventor: David Linton Johnson
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Publication number: 20120287754Abstract: Methods and apparatus to optimize parameters in a downhole environment are described. An example downhole tool includes a transmitter to transmit a signal into a subterranean formation and one or more receivers to receive at least a portion of the acoustic signal. The downhole tool also includes a processor configured to determine slownesses of different acoustic modes at a frequency of the signal received. Each of the slownesses is associated with a first parameter and a second parameter. The different acoustic modes have substantially different sensitivities to at least one of the first parameter or the second parameter. The processor to invert the determined slownesses of the different acoustic modes to determine an optimized value of the first parameter and an optimized value of the second parameter.Type: ApplicationFiled: May 9, 2011Publication date: November 15, 2012Applicant: Schlumberger Technology CorporationInventor: David Linton Johnson
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Patent number: 7894300Abstract: A method and system for fluid characterization in an underground formation surrounding a borehole are provided. Acoustic signals are transmitted and received in the borehole. The received acoustic signals are processed to obtain at least one attribute of formation mobility. Formation fluid is characterized based on a change of the at least one attribute. A decision is made based on the characterization output.Type: GrantFiled: September 3, 2007Date of Patent: February 22, 2011Assignee: Schlumberger Technology CorporationInventors: Andrew Hawthorn, Lucian King Johnston, David Linton Johnson, Takeshi Endo, Henri-Pierre Valero
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Publication number: 20090225627Abstract: 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: March 23, 2009Publication date: September 10, 2009Applicant: Schlumberger Technology CorporationInventors: Bikash K. Sinha, Toru Ikegami, David Linton Johnson, Jahir Pabon
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Publication number: 20090168595Abstract: A method for determining on a real time logging while drilling (LWD) basis gas within earth formations traversed by a borehole. Continuous LWD acoustic measurements are recorded and processed including coherent energy and attenuation attributes to detect downhole gas zones and kick during drilling operations.Type: ApplicationFiled: December 27, 2007Publication date: July 2, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: PETER T. WU, ALAIN DUMONT, PIERRE H. CAMPANAC, DAVID LINTON JOHNSON
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Publication number: 20090168598Abstract: A method for estimating formation permeability from measured sonic wave Stoneley attributes and particularly the Stoneley attributes of slowness (DTst) and attenuation (ATTst), taking into consideration the existence of a heavy walled drill collar at the end of the drill string and the relative lack of borehole mud cake during a drilling operation. In the subject LWD application a real-time qualitative indication for fracture and permeable zones is estimated from Stoneley measurements. This information is useful to a driller to make important timely decisions about drilling and completion programs.Type: ApplicationFiled: December 27, 2007Publication date: July 2, 2009Applicant: Schlumberger Technology CorporationInventors: Peter T. Wu, Alain Dumont, Pierre Campanac, David Linton Johnson
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Patent number: 7529152Abstract: 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: GrantFiled: May 10, 2005Date of Patent: May 5, 2009Assignee: Schlumberger Technology CorporationInventors: Bikash K. Sinha, Toru Ikegami, David Linton Johnson, Jahir Pabon
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Patent number: 7486070Abstract: Certain embodiments are directed to devices, systems and methods for determining a penetration depth of an induced oscillation in a porous medium. In certain examples, the devices, systems and methods are designed to detect a magnetic resonance signal in the presence of an induced oscillatory fluid flow in a porous medium to determine penetration depth of the induced oscillation in the porous medium. In some examples, the mobility of a fluid in the porous medium may be determined from the determined penetration depth.Type: GrantFiled: December 18, 2006Date of Patent: February 3, 2009Assignee: Schlumberger Technology CorporationInventors: David P. Madio, David Linton Johnson
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Publication number: 20080175099Abstract: A method and system for fluid characterization in an underground formation surrounding a borehole are provided. Acoustic signals are transmitted and received in the borehole. The received acoustic signals are processed to obtain at least one attribute of formation mobility. Formation fluid is characterized based on a change of the at least one attribute. A decision is made based on the characterization output.Type: ApplicationFiled: September 3, 2007Publication date: July 24, 2008Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: ANDREW HAWTHORN, LUCIAN KING JOHNSTON, DAVID LINTON JOHNSON, TAKESHI ENDO, HENRI-PIERRE VALERO
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Publication number: 20080143330Abstract: Certain embodiments are directed to devices, systems and methods for determining a penetration depth of an induced oscillation in a porous medium. In certain examples, the devices, systems and methods are designed to detect a magnetic resonance signal in the presence of an induced oscillatory fluid flow in a porous medium to determine penetration depth of the induced oscillation in the porous medium. In some examples, the mobility of a fluid in the porous medium may be determined from the determined penetration depth.Type: ApplicationFiled: December 18, 2006Publication date: June 19, 2008Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: David P. Madio, David Linton Johnson