Patents by Inventor Teruhiko Hagiwara
Teruhiko Hagiwara 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: 10928541Abstract: A logging method and system for imaging a subterranean formation intersected by a borehole. A magnetic dipole generates an electromagnetic field in the formation, and an electric field induced by the magnetic dipole is sensed. The electromagnetic field is sensitive to bed boundaries and other changes of formation characteristics, and becomes induced when encountering the changes. Monitoring the time and magnitude of field inducement yields information about the presence and location of the bed boundaries and target formations. The magnetic dipole is oriented transverse to the borehole axis, and measurements of the electric field take place in directions that include transverse to the orientation of the magnetic dipole and transverse to the borehole axis, parallel with the borehole axis, or both.Type: GrantFiled: August 22, 2017Date of Patent: February 23, 2021Inventor: Teruhiko Hagiwara
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Patent number: 10774636Abstract: Transient responses of a tri-axial resistivity tool corresponding to an electromagnetic (EM) impulse are derived. A transient response of a directional resistivity tool (DRT) corresponding to the EM impulse is derived based on the transient responses of the tri-axial resistivity tool. A theoretical late time transient response of the DRT is derived based on the transient response of the DRT. The late time transient response of the DRT is measured. An anisotropy, a horizontal conductivity, and a dip angle are determined based on the measured late time transient response and the theoretical late time transient response.Type: GrantFiled: December 21, 2018Date of Patent: September 15, 2020Assignee: Saudi Arabian Oil CompanyInventor: Teruhiko Hagiwara
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Patent number: 10557961Abstract: A logging method and system for imaging forward and lateral sections of a subterranean formation. An electric dipole source generates electromagnetic field in the formation that is sensed with magnetic flux sensor that is spaced a distance away from the electric dipole source. The resulting electric dipoles can be axial or transverse, and magnetic flux sensors can sense magnetic fields oriented axially or orthogonally. The axial and transverse electric dipoles can be collocated, and magnetic flux sensors that sense axial or orthogonal magnetic fields can be collocated. Analyzing changes in the magnitude of signals sensed by magnetic flux sensors can indicate the presence and distance of bed boundaries that are ahead and lateral to the electric dipole source.Type: GrantFiled: April 10, 2017Date of Patent: February 11, 2020Assignee: Saudi Arabian Oil CompanyInventor: Teruhiko Hagiwara
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Publication number: 20190112921Abstract: Transient responses of a tri-axial resistivity tool corresponding to an electromagnetic (EM) impulse are derived. A transient response of a directional resistivity tool (DRT) corresponding to the EM impulse is derived based on the transient responses of the tri-axial resistivity tool. A theoretical late time transient response of the DRT is derived based on the transient response of the DRT. The late time transient response of the DRT is measured. An anisotropy, a horizontal conductivity, and a dip angle are determined based on the measured late time transient response and the theoretical late time transient response.Type: ApplicationFiled: December 21, 2018Publication date: April 18, 2019Applicant: Saudi Arabian Oil CompanyInventor: Teruhiko Hagiwara
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Publication number: 20190064382Abstract: A logging method and system for imaging a subterranean formation intersected by a borehole. A magnetic dipole generates an electromagnetic field in the formation, and an electric field induced by the magnetic dipole is sensed. The electromagnetic field is sensitive to bed boundaries and other changes of formation characteristics, and becomes induced when encountering the changes. Monitoring the time and magnitude of field inducement yields information about the presence and location of the bed boundaries and target formations. The magnetic dipole is oriented transverse to the borehole axis, and measurements of the electric field take place in directions that include transverse to the orientation of the magnetic dipole and transverse to the borehole axis, parallel with the borehole axis, or both.Type: ApplicationFiled: August 22, 2017Publication date: February 28, 2019Applicant: Aramco Services CompanyInventor: Teruhiko Hagiwara
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Patent number: 10161245Abstract: Transient responses of a tri-axial resistivity tool corresponding to an electromagnetic (EM) impulse are derived. A transient response of a directional resistivity tool (DRT) corresponding to the EM impulse is derived based on the transient responses of the tri-axial resistivity tool. A theoretical late time transient response of the DRT is derived based on the transient response of the DRT. The late time transient response of the DRT is measured. An anisotropy, a horizontal conductivity, and a dip angle are determined based on the measured late time transient response and the theoretical late time transient response.Type: GrantFiled: May 17, 2016Date of Patent: December 25, 2018Assignee: Saudi Arabian Oil CompanyInventor: Teruhiko Hagiwara
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Publication number: 20180292560Abstract: A logging method and system for imaging forward and lateral sections of a subterranean formation. An electric dipole source generates electromagnetic field in the formation that is sensed with magnetic flux sensor that is spaced a distance away from the electric dipole source. The resulting electric dipoles can be axial or transverse, and magnetic flux sensors can sense magnetic fields oriented axially or orthogonally. The axial and transverse electric dipoles can be collocated, and magnetic flux sensors that sense axial or orthogonal magnetic fields can be collocated. Analyzing changes in the magnitude of signals sensed by magnetic flux sensors can indicate the presence and distance of bed boundaries that are ahead and lateral to the electric dipole source.Type: ApplicationFiled: April 10, 2017Publication date: October 11, 2018Applicant: Aramco Services CompanyInventor: Teruhiko Hagiwara
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Publication number: 20170335684Abstract: Transient responses of a tri-axial resistivity tool corresponding to an electromagnetic (EM) impulse are derived. A transient response of a directional resistivity tool (DRT) corresponding to the EM impulse is derived based on the transient responses of the tri-axial resistivity tool. A theoretical late time transient response of the DRT is derived based on the transient response of the DRT. The late time transient response of the DRT is measured. An anisotropy, a horizontal conductivity, and a dip angle are determined based on the measured late time transient response and the theoretical late time transient response.Type: ApplicationFiled: May 17, 2016Publication date: November 23, 2017Inventor: Teruhiko Hagiwara
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Patent number: 9482776Abstract: A method of identifying a bed boundary in a subterranean formation by processing data measured by an induction logging tool. An interferometric method compares recorded voltages and/or phases recorded at axially spaced apart receivers on the logging tool. A transmitter is on the logging tool and set between the receivers, where the receivers are equally spaced apart from the transmitter. The transmitter emits a signal having frequencies up to around 50 kHz.Type: GrantFiled: February 7, 2013Date of Patent: November 1, 2016Assignee: Aramco Services CompanyInventor: Teruhiko Hagiwara
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Patent number: 9482777Abstract: Systems, devices, and methods for evaluating an earth formation. Apparatus may include a carrier configured for conveyance in a borehole including a conducting tubular comprising a reduced conductivity portion made of reduced conductivity material adjacent at least one of (i) at least one transmitter antenna, and (ii) at least one receiver antenna on the carrier. The material may be a composite and may have a resistivity of between 10?4 and 102 ohm-meters. Methods and apparatus may be configured for producing time-dependent transient electromagnetic (TEM) signals using the transmitter(s) and receiver(s) and estimating a value of a resistivity property using the signals. The apparatus may be used in drilling and may include a bottom hole assembly with a drill bit, and the value may be indicative of a portion of the earth formation ahead of the bit. The value may be used to conduct further operations in a borehole, including geosteering.Type: GrantFiled: February 21, 2014Date of Patent: November 1, 2016Assignee: BAKER HUGHES INCORPORATEDInventors: Gregory B. Itskovich, Steven A. Morris, Teruhiko Hagiwara
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Publication number: 20150241592Abstract: Systems, devices, and methods for evaluating an earth formation. Apparatus may include a carrier configured for conveyance in a borehole including a conducting tubular comprising a reduced conductivity portion made of reduced conductivity material adjacent at least one of (i) at least one transmitter antenna, and (ii) at least one receiver antenna on the carrier. The material may be a composite and may have a resistivity of between 10?4 and 102 ohm-meters. Methods and apparatus may be configured for producing time-dependent transient electromagnetic (TEM) signals using the transmitter(s) and receiver(s) and estimating a value of a resistivity property using the signals. The apparatus may be used in drilling and may include a bottom hole assembly with a drill bit, and the value may be indicative of a portion of the earth formation ahead of the bit. The value may be used to conduct further operations in a borehole, including geosteering.Type: ApplicationFiled: February 21, 2014Publication date: August 27, 2015Applicant: BAKER HUGHES INCORPORATEDInventors: Gregory B. Itskovich, Steven A. Morris, Teruhiko Hagiwara
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Publication number: 20140216818Abstract: A method of identifying a bed boundary in a subterranean formation by processing data measured by an induction logging tool. An interferometric method compares recorded voltages and/or phases recorded at axially spaced apart receivers on the logging tool. A transmitter is on the logging tool and set between the receivers, where the receivers are equally spaced apart from the transmitter. The transmitter emits a signal having frequencies up to around 50 kHz.Type: ApplicationFiled: February 7, 2013Publication date: August 7, 2014Applicant: ARAMCO SERVICES COMPANYInventor: Teruhiko Hagiwara
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Publication number: 20110166842Abstract: A layer stripping method that quickly and robustly determines values of undetermined parameters that model a formation (F). The layer stripping method includes applying inversion methods to subsets (d) of measured data (d) and corresponding modeled responses such that the value of a parameter determined during the application of an inversion method to one subset of the data (d) and the corresponding modeled response can be used to reduce the inversion space of a modeled response that corresponds to another subset of the data (d), to which an inversion method is subsequently applied.Type: ApplicationFiled: May 26, 2009Publication date: July 7, 2011Inventors: Erik Jan Banning-Geertsma, Teruhiko Hagiwara, Richard Martin Ostermeier
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Publication number: 20110071762Abstract: A system and method for determining an electromagnetic response from a region in an earth formation. Receivers where raw response signals (Vraw) are measured are at different offset distances (L1, L2) from a transmitter and are electromagnetically coupled to the transmitter by a support structure. The raw response signals (Vraw) are adjusted according to an exemplary method to provide an adjusted signal (Vadj). The effect of the support structure on the raw response signals (Vraw) is removed or reduced for the adjusted signal (Vadj) and the adjusted signal (vadj) can be interpreted to determine information that is masked in each of the raw response signals (vraw). The adjusted signal (vadj) reflects the electromagnetic response from the region of the earth formation.Type: ApplicationFiled: February 23, 2009Publication date: March 24, 2011Inventor: Teruhiko Hagiwara
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Patent number: 7746076Abstract: A method for using a tool in a wellbore in a formation to predict an anomaly in the formation ahead of the device, the tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. the method comprises a) bringing the tool to a first position inside the wellbore; b) energizing the transmitter to propagate a transient electromagnetic signal into the formation; c) detecting a response signal that has propagated through the formation as a result of the transient signal in step (b); d) calculating a derived quantity for the formation as a function of time based on the detected response signal for the formation; e) plotting the derived quantity for the formation against time; f) moving the tool to at least one other position within the wellbore and repeating steps (b) to (e); g) predicting an anomaly in the formation.Type: GrantFiled: June 2, 2009Date of Patent: June 29, 2010Assignee: Shell Oil CompanyInventors: Richard Martin Ostermeier, Teruhiko Hagiwara, Erik Jan Banning
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Patent number: 7609065Abstract: A method and a system are provided for allowing determination of a direction and distance from a tool to anomaly in a formation. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes transmitting electromagnetic signals from the at least one transmitter through the formation near the wellbore and detecting responses at the at least one receiver induced by the electromagnetic signals. The method may further include determining the direction from the device to the anomaly based on the detected responses. The method may also include calculating at least one of an apparent azimuth angle and an apparent dip angle based on the responses, monitoring the at least one calculated apparent angle over time, and determining the direction to the anomaly after the at least one monitored apparent angle deviates from a zero value.Type: GrantFiled: November 9, 2005Date of Patent: October 27, 2009Assignee: Shell Oil CompanyInventors: Erik Banning, Teruhiko Hagiwara, Rich Ostermeier
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Publication number: 20090237083Abstract: A method for using a tool in a wellbore in a formation to predict an anomaly in the formation ahead of the device, the tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. the method comprises a) bringing the tool to a first position inside the wellbore; b) energizing the transmitter to propagate a transient electromagnetic signal into the formation; c) detecting a response signal that has propagated through the formation as a result of the transient signal in step (b); d) calculating a derived quantity for the formation as a function of time based on the detected response signal for the formation; e) plotting the derived quantity for the formation against time; f) moving the tool to at least one other position within the wellbore and repeating steps (b) to (e); g) predicting an anomaly in the formation.Type: ApplicationFiled: June 2, 2009Publication date: September 24, 2009Inventors: Richard Martin OSTERMEIER, Teruhiko Hagiwara, Erik Jan Banning
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Patent number: 7557581Abstract: A method of imaging a subterranean formation traversed by a wellbore using a tool comprising a transmitter for transmitting electromagnetic signals through the formation and a receiver for detecting response signals. The tool is brought to a first position inside the wellbore, and the transmitter is energized to propagate an electromagnetic signal into the formation. A response signal that has propagated through the formation is detected. A derived quantity for the formation based on the detected response signal for the formation is calculated, and plotted against time. The tool may be moved to at least one other position within the wellbore where the procedure may be repeated to create an image of the formation within the subterranean formation based on the plots.Type: GrantFiled: May 4, 2005Date of Patent: July 7, 2009Assignee: Shell Oil CompanyInventors: Richard Martin Ostermeier, Teruhiko Hagiwara, Erik Jan Banning
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Patent number: 7538555Abstract: A method and a system are provided for allowing determination of a distance from a tool to anomaly ahead of the tool. The apparatus for performing the method includes at least one transmitter and at least one receiver. An embodiment of the method includes transmitting electromagnetic signals from the at least one transmitter through the formation surrounding the wellbore and detecting voltage responses at the at least one receiver induced by the electromagnetic signals. The method includes calculating apparent conductivity or apparent resistivity based on a voltage response. The conductivity or resistivity is monitored over time, and the distance to the anomaly is determined from the apparent conductivity or apparent resistivity values.Type: GrantFiled: July 23, 2004Date of Patent: May 26, 2009Assignee: Shell Oil CompanyInventors: Erik Banning, Teruhiko Hagiwara, Rich Ostermeier
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Patent number: D610974Type: GrantFiled: May 29, 2009Date of Patent: March 2, 2010Assignee: Bridgestone CorporationInventor: Teruhiko Hagiwara