Patents by Inventor Richard A. Rosthal
Richard A. Rosthal 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: 6710601Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: GrantFiled: February 14, 2003Date of Patent: March 23, 2004Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Patent number: 6693430Abstract: Methods and apparatus for making subsurface measurements with reduced or eliminated borehole effects. Antenna and electrode configurations address the undesired axial electric currents that are induced along the borehole when antennas with tilted or transverse axes are used to make electromagnetic measurements. Current and measure electrodes are used in combination with antennas to limit the flow of undesired axial borehole currents. Embodiments use passive, active, or semi-active electrodes to limit the undesired current flow.Type: GrantFiled: August 23, 2002Date of Patent: February 17, 2004Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Jan Wouter Smits
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Patent number: 6690170Abstract: The invention refers to antenna configurations for electromagnetic logging tools. The antennas have one or more electrical conductors disposed on a dielectric substrate wrapped around a core or disposed directly on the core. The conductor or conductors are arranged such that the antenna has a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. The invention also refers to antennas adapted for mutual balancing using interleaved conductive paths or disks to alter the magnetic dipole moments to mutually balance the antenna system.Type: GrantFiled: March 29, 2002Date of Patent: February 10, 2004Assignee: Schlumberger Technology CorporationInventors: Dean M. Homan, Gary A. Hazen, Richard A. Rosthal, David L. Smith, Thomas D. Barber, Paul Michael Ray, Jacques R. Tabanou
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Patent number: 6680613Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: GrantFiled: February 14, 2003Date of Patent: January 20, 2004Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Patent number: 6630830Abstract: A shielding method and apparatus for an antenna disposed on an elongated support adapted for disposal within a borehole. The shield providing predetermined attenuation of one or more electromagnetic energy field components as the field components interact with the shield. The shield composed of a flexible strip or cylindrical body and respectively comprising a transverse conductive element or a transverse slot therein. The shields being adapted to cover an antenna mounted on the support. The shields being compatible for use in conjunction with saddle, tilted coils or multi-layered tri-axial coils to produce a pure transverse magnetic dipole electromagnetic field. The shields are also used in methods for shielding an antenna disposed on a support to provide predetermined attenuation of an electromagnetic field component as the field components interact with the shield.Type: GrantFiled: March 5, 2003Date of Patent: October 7, 2003Assignee: Schlumberger Technology CorporationInventors: Dzevat Omeragic, Jean Seydoux, Richard A. Rosthal
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Publication number: 20030184304Abstract: The invention refers to antenna configurations for electromagnetic logging tools. The antennas have one or more electrical conductors disposed on a dielectric substrate wrapped around a core or disposed directly on the core. The conductor or conductors are arranged such that the antenna has a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. The invention also refers to antennas adapted for mutual balancing using interleaved conductive paths or disks to alter the magnetic dipole moments to mutually balance the antenna system.Type: ApplicationFiled: March 29, 2002Publication date: October 2, 2003Inventors: Dean M. Homan, Gary A. Hazen, Richard A. Rosthal, David L. Smith, Thomas D. Barber, Paul Michael Ray, Jacques R. Tabanou
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Patent number: 6624634Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: GrantFiled: February 14, 2003Date of Patent: September 23, 2003Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Publication number: 20030155924Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: ApplicationFiled: February 14, 2003Publication date: August 21, 2003Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Publication number: 20030155923Abstract: A shielding method and apparatus for an antenna disposed on an elongated support adapted for disposal within a borehole. The shield providing predetermined attenuation of one or more electromagnetic energy field components as the field components interact with the shield. The shield composed of a flexible strip or cylindrical body and respectively comprising a transverse conductive element or a transverse slot therein. The shields being adapted to cover an antenna mounted on the support. The shields being compatible for use in conjunction with saddle, tilted coils or multi-layered tri-axial coils to produce a pure transverse magnetic dipole electromagnetic field. The shields are also used in methods for shielding an antenna disposed on a support to provide predetermined attenuation of an electromagnetic field component as the field components interact with the shield.Type: ApplicationFiled: March 5, 2003Publication date: August 21, 2003Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Dzevat Omeragic, Jean Seydoux, Richard A. Rosthal
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Publication number: 20030146753Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: ApplicationFiled: February 14, 2003Publication date: August 7, 2003Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Publication number: 20030146751Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: ApplicationFiled: February 14, 2003Publication date: August 7, 2003Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Patent number: 6573722Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: GrantFiled: December 15, 2000Date of Patent: June 3, 2003Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Patent number: 6566881Abstract: A shielding method and apparatus for an antenna disposed on an elongated support adapted for disposal within a borehole. The shield providing predetermined attenuation of one or more electromagnetic energy field components as the field components interact with the shield. The shield composed of a flexible strip or cylindrical body and respectively comprising a transverse conductive element or a transverse slot therein. The shields being adapted to cover an antenna mounted on the support. The shields being compatible for use in conjunction with saddle, tilted coils or multi-layered tri-axial coils to produce a pure transverse magnetic dipole electromagnetic field. The shields are also used in methods for shielding an antenna disposed on a support to provide predetermined attenuation of an electromagnetic field component as the field components interact with the shield.Type: GrantFiled: December 22, 2000Date of Patent: May 20, 2003Assignee: Schlumberger Technology CorporationInventors: Dzevat Omeragic, Jean Seydoux, Richard A. Rosthal
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Publication number: 20030085707Abstract: Systems and methods are provided for directional propagation-type logging measurements not sensitive to dip and anisotropy over a wide frequency range. Estimates of the distance of the logging tool to a bed boundary are obtained using “up-down” measurements with antenna configurations having tilted magnetic dipoles. These estimates are insensitive to anistropy and dip, undesirable complications of directional measurements.Type: ApplicationFiled: March 29, 2002Publication date: May 8, 2003Inventors: Gerald N. Minerbo, Dzevat Omeragic, Richard A. Rosthal
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Patent number: 6557794Abstract: A shield apparatus for use in conjunction with a well tool to selectively attenuate one or more electromagnetic energy field components as the components interact with the shield. The shield composed of a flexible strip or conductive body and comprising at least one sloped slot or sloped conductive element therein. The shield being adapted to surround an antenna mounted on a well tool. A method for rotating the axis of the magnetic dipole of a transmitter or receiver coil. A method for winding and shielding an electric coil such that the resultant coil emits or receives selected electromagnetic energy field components.Type: GrantFiled: August 17, 2001Date of Patent: May 6, 2003Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean M. Homan, Dzevat Omeragic, Stephen D. Bonner, Brian Clark, Scott S. Chesser, Thomas D. Barber
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Publication number: 20030011371Abstract: Methods and apparatus for making subsurface measurements with reduced or eliminated borehole effects. Antenna and electrode configurations address the undesired axial electric currents that are induced along the borehole when antennas with tilted or transverse axes are used to make electromagnetic measurements. Current and measure electrodes are used in combination with antennas to limit the flow of undesired axial borehole currents. Embodiments use passive, active, or semi-active electrodes to limit the undesired current flow.Type: ApplicationFiled: August 23, 2002Publication date: January 16, 2003Inventors: Richard A. Rosthal, Jan Wouter Smits
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Publication number: 20020105332Abstract: Methods and apparatus are disclosed for minimizing or eliminating an undesired axial electric current induced along a subsurface borehole in the process of subsurface measurements with transmitter and/or receiver antennas which are substantially time varying magnetic dipoles with their dipole moments aligned at an angle to the axis of the borehole. Some antennas are disposed within the borehole on instruments having a non-conductive support member. One instrument includes a conductive all-metal body with an antenna adapted for induction frequencies. Antenna shields adapted for controlled current flow are also provided with an all-metal instrument. Methods include providing an alternate path for the current along the instrument body. Another method includes emitting a controlled current to counter the undesired current. Another method corrects for the effect of the current using a superposition technique.Type: ApplicationFiled: December 15, 2000Publication date: August 8, 2002Inventors: Richard A. Rosthal, Dean Homan, Thomas D. Barber, Stephen Bonner, Brian Clark, Dzevat Omeragic
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Patent number: 6380744Abstract: A shield apparatus for use in conjunction with a well tool to selectively attenuate one or more electromagnetic energy field components as the components interact with the shield. The shield composed of a flexible strip or conductive body and comprising at least one sloped slot or sloped conductive element therein. The shield being adapted to surround an antenna mounted on a well tool. A method for rotating the axis of the magnetic dipole of a transmitter or receiver coil. A method for winding and shielding an electric coil such that the resultant coil emits or receives selected electromagnetic energy field components.Type: GrantFiled: August 17, 2001Date of Patent: April 30, 2002Assignee: Schlumberger Technology CorporationInventors: Brian Clark, Richard A. Rosthal, Dean M. Homan, Dzevat Omeragic, Stephen D. Bonner, Scott S. Chesser, Thomas D. Barber
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Patent number: 6373254Abstract: The present invention describes a method and apparatus to control the effect of contact impedance on a formation resistivity measurement during a logging-while-drilling operation. The control of contact impedance is accomplished by maintaining a substantially zero difference in potential between two monitor electrodes positioned on the resistivity logging tool near a current electrode. The tool can employ a ring electrode configuration and/or a button electrode, configuration. The ring electrode configuration incorporates two pairs of ring monitor electrodes on each side of a ring current electrode. The button electrode configuration incorporates. a monitor electrode, surrounded by a current electrode, surrounded by a second monitor electrode. Insulation gaps are positioned between each electrode to separate the electrodes. A variable current is supplied to the current electrode in each configuration to maintain the same potential at each monitor electrode.Type: GrantFiled: May 25, 1999Date of Patent: April 16, 2002Assignee: Schlumberger Technology CorporationInventors: Dominique Dion, Mark T. Frey, James Stephen Hall, Qiming Li, Richard A. Rosthal, Mark A. Fredette
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Patent number: 6351127Abstract: A shield apparatus for use in conjunction with a well tool to selectively attenuate one or more electromagnetic energy field components as the components interact with the shield. The shield composed of a flexible strip or conductive body and comprising at least one sloped slot or sloped conductive element therein. The shield being adapted to surround an antenna mounted on a well tool. A method for rotating the axis of the magnetic dipole of a transmitter or receiver coil. A method for winding and shielding an electric coil such that the resultant coil emits or receives selected electromagnetic energy field components.Type: GrantFiled: December 1, 1999Date of Patent: February 26, 2002Assignee: Schlumberger Technology CorporationInventors: Richard A. Rosthal, Dean M. Homan, Dzevat Omeragic, Stephen D. Bonner, Brian Clark, Scott S. Chesser, Thomas D. Barber