Patents by Inventor Martin Folberth

Martin Folberth 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).

  • Publication number: 20240004100
    Abstract: A system herein includes one or more processors to determine asymmetric compensation measurements from at least one receiver antenna pair and at least one transmitter antenna pair on a tool body in an underground formation. The asymmetric compensation measurements are to be used with symmetric compensation measurements from the plurality of antenna pairs. The asymmetric compensation measurements are associated with signals from individual transmitter antennas that are at asymmetric or unequal distances from individual receiver antennas that receive a version of the signals. The individual receiver antennas are part of the at least one receiver antenna pair having symmetrically located receiver antennas with respect to a midpoint of the tool body and the individual transmitter antennas are part of the at least one transmitter antenna pair having symmetrically located transmitter antennas with respect to a midpoint of the tool body.
    Type: Application
    Filed: May 23, 2023
    Publication date: January 4, 2024
    Applicant: Baker Hughes Oilfield Operations LLC
    Inventors: Thomas Kruspe, Martin Folberth, Sushant M. Dutta, Andreas Hartmann, Holger F. Thern
  • Publication number: 20230043389
    Abstract: A downhole antenna tool is disclosed for downhole well-logging or other downhole operations. Antenna bars are provided for winding of coils through associated coil carriers of individual ones of the antenna bars. The antenna bars with the wound coils are coated with a protection layer and are releasably coupled to a substrate of the downhole antenna tool using, for example, a silicone cushion layer.
    Type: Application
    Filed: December 30, 2019
    Publication date: February 9, 2023
    Applicant: Baker Hughes Oilfield Operations LLC
    Inventors: Martin Folberth, Jens Behnsen, Andreas Hartmann, Sven-Hendrik Lampe, Nikolay Nikolaevich Velker, David Sergeevich Vlasov, Alexander S. Vershinin
  • Patent number: 10042076
    Abstract: A system for measuring electric characteristics of an earth formation includes a carrier configured to be disposed in an earth formation, and an inductive measurement assembly including an antenna configured to generate an oscillating magnetic field in the earth formation and measure a resistivity of the formation by detecting a signal in response to currents induced in the formation. The system also includes a capacitive measurement assembly including a capacitive measurement electrode configured to detect a signal in response to a measurement current injected into the formation, the capacitive measurement electrode disposed between the antenna and the formation and in a path of the magnetic field, the capacitive measurement electrode formed from a plurality of constituent electrodes that are electrically isolated from each other so as to prevent induction of eddy currents across the plurality of electrodes.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: August 7, 2018
    Assignee: Baker Hughes, a GE company, LLC
    Inventors: Matthias Gorek, Martin Folberth, Eduard Kirchmeier
  • Publication number: 20170139073
    Abstract: A system for measuring electric characteristics of an earth formation includes a carrier configured to be disposed in an earth formation, and an inductive measurement assembly including an antenna configured to generate an oscillating magnetic field in the earth formation and measure a resistivity of the formation by detecting a signal in response to currents induced in the formation. The system also includes a capacitive measurement assembly including a capacitive measurement electrode configured to detect a signal in response to a measurement current injected into the formation, the capacitive measurement electrode disposed between the antenna and the formation and in a path of the magnetic field, the capacitive measurement electrode formed from a plurality of constituent electrodes that are electrically isolated from each other so as to prevent induction of eddy currents across the plurality of electrodes.
    Type: Application
    Filed: November 11, 2016
    Publication date: May 18, 2017
    Applicant: Baker Hughes Incorporated
    Inventors: Matthias Gorek, Martin Folberth, Eduard Kirchmeier
  • Publication number: 20160032715
    Abstract: A drillstring communications system includes one or more pipe segments, a communication sub coupled to the pipe segment that includes a communication sub antenna, and a leaky feeder antenna in communication with the communication sub antenna.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 4, 2016
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Stephan Mueller, Ingo Roders, Martin Folberth, Kai Schoenborn
  • Patent number: 8390295
    Abstract: A system for measuring a resistivity parameter of an earth formation includes: at least one measurement electrode electrically connected to a first electrical source; at least one guard electrode; a shielding electrode interposed between the at least one guard electrode and the at least one measurement electrode, the shielding electrode being electrically connected to a second electrical source independent from the first electrical source, and the guard electrode being electrically connected to a third electrical source independent of the first and second electrical sources; at least one return electrode; insulators positioned between (i) the measurement electrode and the shielding electrode, (ii) the shielding electrode and the guard electrode and (iii) the measurement electrode, the guard electrode and the return electrode; and a processor configured to adjust at least one of the first electrical source and the second electrical source to minimize a current flow through the shielding electrode.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: March 5, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Matthias Gorek, Martin Folberth, Christian Fulda
  • Patent number: 8258790
    Abstract: An apparatus for evaluating an earth formation, the apparatus including: a logging tool configured to be conveyed through a borehole penetrating the earth formation; a coil inductively coupled to the earth formation, the coil being disposed at the logging instrument; and a circuit coupled to the coil wherein the circuit and the coil form an oscillator circuit, the oscillator circuit being configured to oscillate when a circuit parameter of the oscillator circuit satisfies an oscillation criterion, the circuit parameter being related to a property of the earth formation.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: September 4, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Martin Folberth, Matthias Gorek, Eduard Kirchmeier
  • Publication number: 20110248716
    Abstract: An apparatus and method for estimating a resistivity property of an earth formation involving electric current injected into a wall of a borehole. The apparatus includes a first electrode, a second electrode, and a differential amplifier. The first electrode may be configured to impart an electric current into a borehole wall and be directly connected to a first input of the differential amplifier. The second electrode may be directly connected to a second input of the differential amplifier. The method may also include a summing circuit connected to the output of the differential amplifier. The method includes estimating a resistivity property using the output of the differential amplifier or the summing circuit.
    Type: Application
    Filed: April 5, 2011
    Publication date: October 13, 2011
    Applicant: BAKER HUGHES INCORPORATED
    Inventor: Martin Folberth
  • Publication number: 20100123461
    Abstract: An apparatus for evaluating an earth formation, the apparatus including: a logging tool configured to be conveyed through a borehole penetrating the earth formation; a coil inductively coupled to the earth formation, the coil being disposed at the logging instrument; and a circuit coupled to the coil wherein the circuit and the coil form an oscillator circuit, the oscillator circuit being configured to oscillate when a circuit parameter of the oscillator circuit satisfies an oscillation criterion, the circuit parameter being related to a property of the earth formation.
    Type: Application
    Filed: November 20, 2008
    Publication date: May 20, 2010
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Martin Folberth, Matthias Gorek, Eduard Kirchmeier
  • Patent number: 7679368
    Abstract: A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The impedance seen by the measurement electrode (indicative of the formation resistivity) is determined by using a directional coupler that measures a reflection coefficient of an electrical signal.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: March 16, 2010
    Assignee: Baker Hughes Incorporated
    Inventor: Martin Folberth
  • Publication number: 20100007349
    Abstract: A system for measuring a resistivity parameter of an earth formation includes: at least one measurement electrode electrically connected to a first electrical source; at least one guard electrode; a shielding electrode interposed between the at least one guard electrode and the at least one measurement electrode, the shielding electrode being electrically connected to a second electrical source independent from the first electrical source, and the guard electrode being electrically connected to a third electrical source independent of the first and second electrical sources; at least one return electrode; insulators positioned between (i) the measurement electrode and the shielding electrode, (ii) the shielding electrode and the guard electrode and (iii) the measurement electrode, the guard electrode and the return electrode; and a processor configured to adjust at least one of the first electrical source and the second electrical source to minimize a current flow through the shielding electrode.
    Type: Application
    Filed: July 11, 2008
    Publication date: January 14, 2010
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Matthias Gorek, Martin Folberth, Christian Fulda
  • Patent number: 7256582
    Abstract: A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the measurement electrodes and the shielding electrodes. This provides improved focusing and avoids effects of contact impedance.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: August 14, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: Matthias Gorek, Martin Folberth, Christian Fulda
  • Publication number: 20070029083
    Abstract: A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The impedance seen by the measurement electrode (indicative of the formation resistivity) is determined by using a directional coupler that measures a reflection coefficient of an electrical signal.
    Type: Application
    Filed: July 31, 2006
    Publication date: February 8, 2007
    Applicant: Baker Hughes Incorporated
    Inventor: Martin Folberth
  • Patent number: 7141981
    Abstract: A resistivity logging tool suitable for downhole use includes a transmitter, two spaced apart receivers. The measured resistivities at the two receivers are corrected for differences in receiver characteristics based on measuring the responses of the receivers to a calibration signal passed through calibration circuits. The logging tool may be used in reservoir navigation. A calibration antenna positioned between the two receivers may be used to identify factors other than the distance to a bed boundary that may effect the receiver signals.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: November 28, 2006
    Assignee: Baker Hughes Incorporated
    Inventors: Martin Folberth, Tsili Wang
  • Publication number: 20060238202
    Abstract: A galvanic resistivity tool with one or more measurement electrodes and guard electrodes, and one or more shielding electrodes. The potential difference between the measurement electrodes and the guard electrodes is controlled to minimize current flow between the measurement electrodes and the shielding electrodes. This provides improved focusing and avoids effects of contact impedance.
    Type: Application
    Filed: April 20, 2005
    Publication date: October 26, 2006
    Inventors: Matthias Gorek, Martin Folberth, Christian Fulda
  • Publication number: 20060214664
    Abstract: A method and apparatus for downhole resistivity imaging uses an antenna coupled to a power source through a directional coupler. Measured reflectivity values are indicative of the antenna impedance and the formation resistivity, particularly if some compensation is made for the antenna inductance.
    Type: Application
    Filed: March 24, 2005
    Publication date: September 28, 2006
    Inventors: Martin Folberth, Christian Fulda, Matthias Gorek
  • Publication number: 20060017442
    Abstract: A resistivity logging tool suitable for downhole use includes a transmitter, two spaced apart receivers. The measured resistivities at the two receivers are corrected for differences in receiver characteristics based on measuring the responses of the receivers to a calibration signal passed through calibration circuits. The logging tool may be used in reservoir navigation. A calibration antenna positioned between the two receivers may be used to identify factors other than the distance to a bed boundary that may effect the receiver signals.
    Type: Application
    Filed: July 23, 2004
    Publication date: January 26, 2006
    Inventor: Martin Folberth
  • Publication number: 20060017443
    Abstract: A resistivity logging tool suitable for downhole use includes a transmitter, two spaced apart receivers. The measured signals are inverted to determine the distance to a boundary in the earth formation in the presence of a transition zone in resistivity. The direction of drilling may be controlled based on the determined distance.
    Type: Application
    Filed: July 15, 2005
    Publication date: January 26, 2006
    Inventors: Martin Folberth, Sheng Fang, Tsili Wang
  • Patent number: 6957708
    Abstract: The invention is a method and apparatus for determining an electrical property a formation surrounding a borehole with a measuring-while-drilling device. The apparatus an antenna configuration disposed along the outer face of an extendable stabilizer joined to a rotatable drill collar. Typically, two receivers and two transmitters are spaced along the longitudinal axis of the drill collar, with the two receivers spaced symmetrically in between the two transmitters. Alternatively, receivers and transmitters can be spaced along the circumference, possibly over multiple stabilizers. Multiple assemblies can be used. Data can be obtained with the transmitter-receiver assembly held in a stationary position or rotating circumferentially. Apparatus can be operated in a “broadside” configuration, an “endfire” configuration, or a configuration in which transmitter coils and receiver coils are oriented orthogonally to each other.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: October 25, 2005
    Assignee: Baker Hughes Incorporated
    Inventors: Roland E. Chemali, Martin Folberth, Tsili Wang, Rene Ritter
  • Publication number: 20050006090
    Abstract: The invention is a method and apparatus for determining an electrical property a formation surrounding a borehole with a measuring-while-drilling device. The apparatus an antenna configuration disposed along the outer face of an extendable stabilizer joined to a rotatable drill collar. Typically, two receivers and two transmitters are spaced along the longitudinal axis of the drill collar, with the two receivers spaced symmetrically in between the two transmitters. Alternatively, receivers and transmitters can be spaced along the circumference, possibly over multiple stabilizers. Multiple assemblies can be used. Data can be obtained with the transmitter-receiver assembly held in a stationary position or rotating circumferentially. Apparatus can be operated in a “broadside” configuration, an “endfire” configuration, or a configuration in which transmitter coils and receiver coils are oriented orthogonally to each other.
    Type: Application
    Filed: July 8, 2003
    Publication date: January 13, 2005
    Inventors: Roland Chemali, Martin Folberth, Tsili Wang, Rene Ritter