Patents by Inventor Christian Stoller

Christian Stoller 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).

  • Patent number: 9897718
    Abstract: Methods and downhole tools involving neutron-absorbing gamma ray windows are provided. One such method involves emitting neutrons from a neutron source in a downhole tool in a well into a surrounding geological formation. This may produce formation gamma rays through interactions between the neutrons and elements of the geological formation. The formation gamma rays may be detected by a gamma ray detector when the gamma rays pass via a gamma ray window that includes a neutron-absorbing material disposed in a substrate material of the downhole tool. The gamma ray window may be both more transmissive of gamma rays than the substrate material and less transmissive of neutrons than a window without the neutron-absorbing material. This may decrease a neutron flux that would otherwise reach the gamma ray detector and the tool materials surrounding it and thus would otherwise lead to a background signal contaminating a signal corresponding to the detected formation gamma rays.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 20, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Marie-Laure Mauborgne, Ahmed Amine Mahjoub, Markus Berheide, Christian Stoller
  • Publication number: 20180031725
    Abstract: A method for determining a formation thermal neutron decay rate from measurements of radiation resulting from at least one burst of high energy neutrons into formations surrounding a wellbore includes determining a first apparent neutron decay rate in a time window beginning at a first selected time after an end of the at least one burst, a second apparent decay rate from a time window beginning at a second selected time after the burst and a third apparent decay rate from a third selected time after the burst. The second time is later than the first time. A thermal neutron capture cross section of fluid in the wellbore is determined. A decay rate correction factor is determined based on the first and second apparent decay rates and a parameter indicative of the wellbore capture cross-section. The correction factor is applied to the third apparent decay rate to determine the formation thermal neutron decay rate.
    Type: Application
    Filed: October 5, 2017
    Publication date: February 1, 2018
    Inventors: Tong Zhou, Christian Stoller
  • Patent number: 9880295
    Abstract: A scintillator type radiation detector package is provided including a scintillation crystal directly coupled to the window of a photomultiplier. A scintillator package is also provided having a longer life at wellbore temperature with minimal deterioration of a hygroscopic scintillation crystal(s). Direct optical coupling of the scintillator to the photomultiplier reduces the amount of light lost at coupling interfaces and improved detection resolution over the conventional structures having separate packages for crystal and photomultiplier.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: January 30, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Ken Stephenson, Peter Wraight, Wolfgang Ziegler, Christian Stoller, Irina Molodetsky, John J. Simonetti, Donna Simonetti
  • Publication number: 20180003854
    Abstract: The current disclosure is related to a downhole tool that comprises an electronic photon generator and at least one detector. The electronic photon generator comprises a cathode configured to emit electrons, a first target configured to generate photons when struck by the electrons, a second target configured to generate photons when struck by the electrons, and a beam steering device that directs the electrons to a first or second target. The at least one detector is configured to detect at least some of the photons emitted by the first target and at least some of the photons emitted by the second target.
    Type: Application
    Filed: June 29, 2016
    Publication date: January 4, 2018
    Inventors: Matthieu Simon, Christian Stoller
  • Publication number: 20170363770
    Abstract: The disclosure relates to a method for correcting a downhole natural gamma-ray measurement performed in a wellbore. A gamma-ray measurement including at least a gamma-ray count rate is obtained by a gamma-ray detector disposed in a bottom hole assembly having a mud channel inside of the assembly, such that mud flows downwards in the mud channel and upwards outside of the assembly and a neutron source situated above the gamma-ray detector and activating the mud.
    Type: Application
    Filed: June 15, 2016
    Publication date: December 21, 2017
    Inventors: Marie-Laure Mauborgne, Francoise Allioli, Fabien Haranger, Christian Stoller
  • Patent number: 9835736
    Abstract: Systems, methods, and devices for thermally protecting a scintillator crystal of a scintillation detector are provided. In one example, a thermally-protected scintillator may include a scintillator crystal and a thermal protection element, which may partially surround the scintillator crystal. The thermal protection element may be configured to prevent the scintillator crystal from experiencing a rate of change in temperature sufficient to cause cracking or non-uniform light output, or a combination thereof.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: December 5, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Christian Stoller, Robert A. Adolph, Bradley A. Roscoe
  • Patent number: 9823384
    Abstract: A method for estimating a drilling fluid flow rate in a subterranean wellbore includes processing an acquired gamma ray spectrum in combination with standard elemental spectra and at least one standard oxygen activation spectrum to compute an oxygen activation yield. The oxygen activation yield is further processed to estimate a drilling fluid flow rate and or to infer a borehole diameter change or a lost circulation event. The gamma ray spectrum is acquired using a logging string employing a neutron source and a natural gamma ray sensor.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: November 21, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Jiaxin Wang, Libai Xu, Christian Stoller
  • Publication number: 20170315260
    Abstract: A method for separating and quantifying gamma ray induced and neutron induced responses in a radiation detector includes detecting radiation in a radiation field comprising neutrons and gamma rays. The detected events are converted into a detector pulse amplitude spectrum. The pulse amplitude spectrum is decomposed into contributions from detected gamma rays and detected neutrons using gamma ray standard spectra and neutron standard spectra and a spectral fitting procedure which results in a best fit between a weighted sum of the contributions and the detector pulse amplitude spectrum. The fitting procedure includes determining fitting parameters for each of the standard spectra wherein at least one of the fitting parameters is different for the gamma ray standard spectra and the neutron standard spectra. In one embodiment, the fitting parameter is spectral gain.
    Type: Application
    Filed: May 2, 2016
    Publication date: November 2, 2017
    Inventor: Christian Stoller
  • Patent number: 9805903
    Abstract: A well-logging tool may include a sonde housing and a radiation generator carried by the sonde housing. The radiation generator may include a generator housing, a target carried by the generator housing, a charged particle source carried by the generator housing to direct charged particles at the target, and at least one voltage source coupled to the charged particle source. The at least one voltage source may include a voltage ladder comprising a plurality of voltage multiplication stages coupled in a uni-polar configuration, and at least one loading coil coupled at at least one intermediate position along the voltage ladder. The well-logging tool may further include at least one radiation detector carried by the sonde housing.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: October 31, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Matthieu Simon, Anthony Durkowski, Christian Stoller
  • Patent number: 9805902
    Abstract: A well-logging tool may include a sonde housing, and a radiation generator carried by the sonde housing. The radiation generator may include a generator housing, a target carried by the generator housing, a charged particle source carried by the generator housing to direct charged particles at the target, and at least one voltage source coupled to the charged particle source. The at least one voltage source may include a voltage ladder comprising a plurality of voltage multiplication stages coupled in a bi-polar configuration, and at least one loading coil coupled at at least one intermediate position along the voltage ladder. The well-logging tool may further include at least one radiation detector carried by the sonde housing.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: October 31, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Matthieu Simon, Anthony Durkowski, Christian Stoller
  • Patent number: 9798037
    Abstract: A method for determining a formation thermal neutron decay rate from measurements of radiation resulting from at least one burst of high energy neutrons into formations surrounding a wellbore includes determining a first apparent neutron decay rate in a time window beginning at a first selected time after an end of the at least one burst, a second apparent decay rate from a time window beginning at a second selected time after the burst and a third apparent decay rate from a third selected time after the burst. The second time is later than the first time. A thermal neutron capture cross section of fluid in the wellbore is determined. A decay rate correction factor is determined based on the first and second apparent decay rates and a parameter indicative of the wellbore capture cross-section. The correction factor is applied to the third apparent decay rate to determine the formation thermal neutron decay rate.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: October 24, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Tong Zhou, Christian Stoller
  • Publication number: 20170285219
    Abstract: Methods may include detecting the presence of a component in a wellbore including irradiating an interval of a wellbore containing one or more components of a wellbore tool with a neutron source, wherein the one or more components of the wellbore tool comprise one or more tracer materials; measuring the radiation emitted from the one or more components of a wellbore tool; determining one or more of presence, location, and intensity of the radiation emitted from the one or more components of the wellbore tool. Devices may include a first element comprising one or more tracer materials, wherein the one or more tracer materials emit gamma radiation upon irradiation with a neutron source; wherein the tool is configured to be emplaced in a subterranean formation.
    Type: Application
    Filed: March 31, 2016
    Publication date: October 5, 2017
    Inventors: Dominic Joseph Brady, Ali Bin Al-Sheikh, Christian Stoller
  • Patent number: 9715022
    Abstract: A radiation detector package includes a support apparatus at least part of which is constructed from a naturally occurring radioactive material. A scintillator is associated with the support apparatus. The support may include a detector housing carrying a photodetector and the scintillator, and the detector housing may be constructed from the naturally occurring radioactive material.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: July 25, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Wolfgang Ziegler, Christian Stoller, Kenneth E. Stephenson
  • Publication number: 20170205529
    Abstract: Devices and methods for a rugged semiconductor radiation detector are provided. The semiconductor detector may include a hermetically sealed housing and a semiconductor disposed within the housing that has a first surface and a second surface opposite one another. A first metallization layer may at least partially cover the first surface of the semiconductor and a second metallization layer may at least partially cover the second surface of the semiconductor. The first metallization layer or the second metallization layer, or both, do not extend completely to an edge of the semiconductor, thereby providing a nonconductive buffer zone. This reduces electrical field stresses that occur when a voltage potential is applied between the first metallization layer and the second metallization layer and reduces a likelihood of electrical failure (e.g., due to arcing).
    Type: Application
    Filed: July 21, 2015
    Publication date: July 20, 2017
    Inventors: Frederic Gicquel, Olivier G. Philip, Christian Stoller, Zilu Zhou
  • Patent number: 9696455
    Abstract: The present disclosure describes a downhole tool that includes an electrically operated radiation generator that selectively outputs radiation to a surrounding environment based at least in part on supply of electrical power; a radiation detector that determines a first radiation metric based at least in part on first radiation measured when the electrically operated radiation generator is outputting radiation and that determines a second radiation metric based at least in part on second radiation measured when the electrically operated radiation generator is not outputting radiation; and a control system that determines whether the surrounding environment is properly shielded based at least in part on a relationship between the first radiation metric and the second radiation metric.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: July 4, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Richard J. Radtke, Christian Stoller, Michael D. Hackbart
  • Publication number: 20170176632
    Abstract: This disclosure is related to a downhole tool to be lowered into a wellbore, having a longitudinal axis and an outer surface, the tool including: a particle detection assembly having at least one particle detector for detecting at least a predetermined type of particles, wherein the particle detectors of the assembly are each wrapped around at least one detecting portion forming an angular portion of the tool azimuthal plane perpendicular to the longitudinal axis of the tool so that the detection assembly substantially forms a ring, at least a window transparent to the particle type and extending between the outer surface and the particle detection assembly.
    Type: Application
    Filed: December 12, 2016
    Publication date: June 22, 2017
    Inventors: Mauro Manclossi, Laurent Laval, Christian Stoller
  • Publication number: 20170139074
    Abstract: The present disclosure describes a downhole tool including an electrically operated radiation generator that selectively output radiation to a surrounding environment based at least in part on supply of electrical power; and a control system that determines likelihood of exposing living beings in the surrounding environment to output radiation by determining whether one or more check conditions is met; determine that each of the one or more check conditions is met before instructing the electrically operated radiation generator to output radiation; and instruct the electrically operated radiation generator to cease output of radiation when at least one of the one or more check conditions is no longer met.
    Type: Application
    Filed: November 8, 2016
    Publication date: May 18, 2017
    Inventors: Christian Stoller, Matthieu Simon, David Alan Rose, Libo Yang, Onur Ozen, Sicco Beekman
  • Publication number: 20170139075
    Abstract: The present disclosure describes a downhole tool that includes an electrically operated radiation generator that selectively outputs radiation to a surrounding environment based at least in part on supply of electrical power; a radiation detector that determines a first radiation metric based at least in part on first radiation measured when the electrically operated radiation generator is outputting radiation and that determines a second radiation metric based at least in part on second radiation measured when the electrically operated radiation generator is not outputting radiation; and a control system that determines whether the surrounding environment is properly shielded based at least in part on a relationship between the first radiation metric and the second radiation metric.
    Type: Application
    Filed: November 12, 2015
    Publication date: May 18, 2017
    Inventors: Richard J. Radtke, Christian Stoller, Michael D. Hackbart
  • Patent number: 9541670
    Abstract: The disclosure includes an arrangement of X-ray generator(s) (210), X-ray detector(s) (214), and/or X-ray calibration device(s) for performing X-ray measurements, such as attenuation and/or photo electric factor measurements, on formation core samples (204) in a downhole environment under conditions including limited space and operations at high pressure and temperature.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: January 10, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Joel L. Groves, Christian Stoller
  • Publication number: 20160349398
    Abstract: A method for determining a fractional volume of at least one component of a formation includes entering into a computer a number of detected radiation events resulting from imparting neutrons into the formation at an energy level of at least 1 million electron volts (MeV). The detected radiation events correspond to at least one of an energy level of the imparted neutrons and thermal or epithermal energy neutrons. A measurement of at least one additional petrophysical parameter of the formation is made. The at least one additional petrophysical parameter measurement and at least one of a fast neutron cross-section and a thermal neutron cross-section determined from the detected radiation events are used in the computer to determine the fractional volume of the at least one component of the formation. In another embodiment, the fast neutron cross-section and the thermal neutron cross-section may be used on combination to determine the fractional volume.
    Type: Application
    Filed: May 29, 2015
    Publication date: December 1, 2016
    Inventors: Tong Zhou, Christian Stoller, James Leslie Thornton, David Alan Rose