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: 10317568
    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: Grant
    Filed: June 15, 2016
    Date of Patent: June 11, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Marie-Laure Mauborgne, Francoise Allioli, Fabien Haranger, Christian Stoller
  • Patent number: 10301934
    Abstract: A downhole densitometer is used to determine one or more characteristics of a flowing fluid. The densitometer has one or more downhole x-ray sources and one or more downhole x-ray detectors. A fluid is allowed to flow past the x-ray sources. X-rays emitted by the x-ray sources and that have travelled through the flowing fluid are detected by the x-ray detectors. Characteristics of the flowing fluid are determined based on the detected x-rays. The densitometer may also have reference detectors used to measure a reference signal. The measured reference signal is used to normalize source emissions. The densitometer may be used as a permanent monitor and it may be used in conjunction with other sensors such as a flow-rate sensor or a capacitance sensor. The x-ray source may be, for example, a pyroelectric source, a radioisotopic source, or a traditional x-ray tube source.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: May 28, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Dominic Joseph Brady, Reza Taherian, Gary Oddie, Christian Stoller
  • Patent number: 10295700
    Abstract: A system for a downhole tool includes an X-ray generator that outputs X-ray radiation into a surrounding sub-surface formation using electrical power received from a power supply and a detector device adjacent the X-ray generator. The detector device includes a first detector with a first radiation sensitivity that outputs a first measurement signal based on interaction between a first portion of the X-ray radiation and the first detector. The detector device also includes a second detector with a second radiation sensitivity adjacent the first detector, where the second detector outputs a second measurement signal based on interaction between a second portion of the X-ray radiation and the second detector.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: May 21, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Sicco Beekman, Christian Stoller
  • Patent number: 10261214
    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: Grant
    Filed: May 2, 2016
    Date of Patent: April 16, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: Christian Stoller
  • Publication number: 20190049620
    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: October 18, 2018
    Publication date: February 14, 2019
    Inventors: Frederic Gicquel, Olivier G. Philip, Christian Stoller, Zilu Zhou
  • Publication number: 20190033484
    Abstract: A method for evaluating cement in a cased wellbore in a geological formation includes placing a downhole tool into the cased wellbore, where the cased wellbore has been cased using a cement that contains a particular material. The method includes emitting neutrons using the downhole tool, wherein the neutrons interact with the particular material via inelastic scattering or capture of neutrons and cause the material to emit an energy spectrum of the gamma rays associated with the material or wherein the time-based measurement of gamma rays or neutrons is influenced by the presence of the material. The method includes using the downhole tool to detect radiation radiation, such as the energy spectrum of the gamma rays, or a die-away pattern of the gamma rays or neutrons that indicates a presence of the particular material and enable to estimate a parameter of the cement.
    Type: Application
    Filed: July 25, 2017
    Publication date: January 31, 2019
    Inventors: Christian Stoller, Alice Chougnet - Sirapian, Mauro Manclossi, Marie-Laure Mauborgne
  • Patent number: 10120099
    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: Grant
    Filed: July 21, 2015
    Date of Patent: November 6, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATON
    Inventors: Frederic Gicquel, Olivier G. Philip, Christian Stoller, Zilu Zhou
  • Patent number: 10114143
    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: Grant
    Filed: December 12, 2016
    Date of Patent: October 30, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Mauro Manclossi, Laurent Laval, Christian Stoller, Francoise Allioli
  • Patent number: 10102998
    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: October 24, 2017
    Date of Patent: October 16, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Matthieu Simon, Anthony Durkowski, Christian Stoller
  • Publication number: 20180261349
    Abstract: Disclosed is a radiation logging tool, comprising a tool housing; a compact generator that produces radiation; a power supply coupled to the compact generator; and control circuitry. Embodiments of the compact generator comprise a generator vacuum tube comprising a source generating charged particles, and a target onto which the charged particles are directed; and a high voltage supply comprising a high voltage multiplier ladder located laterally adjacent to the generator vacuum tube. The high voltage supply applies a high voltage between the source and the target to accelerate the charged particles to a predetermined energy level. The compact generator also includes an electrical coupling between an output of the high voltage supply and the target of the generator vacuum tube to accommodate the collocated positions of the generator vacuum tube and the high voltage power supply.
    Type: Application
    Filed: April 13, 2018
    Publication date: September 13, 2018
    Inventors: Luke T. Perkins, Christian Stoller, Peter Wraight
  • Patent number: 10061055
    Abstract: Systems and methods for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy are provided. In one example, a system for estimating an absolute yield of an element in a subterranean formation may include a downhole tool and data processing circuitry. The downhole tool may include a neutron source to emit neutrons into the formation, a neutron monitor to detect a count rate of the emitted neutrons, and a gamma-ray detector to obtain gamma-ray spectra deriving at least in part from inelastic gamma-rays produced by inelastic scattering events and neutron capture gamma-rays produced by neutron capture events. The data processing circuitry may be configured to determine a relative elemental yield from the gamma-ray spectra and to determine an absolute elemental yield based at least in part on a normalization of the relative elemental yield to the count rate of the emitted neutrons.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: August 28, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Jim A. Grau, Markus Berheide, Christian Stoller, Brad Roscoe, James Thornton
  • Publication number: 20180210110
    Abstract: Systems, methods, and devices for inelastic gamma-ray logging are provided. In one embodiment, such a method includes emitting neutrons into a subterranean formation from a downhole tool to produce inelastic gamma-rays, detecting a portion of the inelastic gamma-rays that scatter back to the downhole tool to obtain an inelastic gamma-ray signal, and determining a property of the subterranean formation based at least in part on the inelastic gamma-ray signal. The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background.
    Type: Application
    Filed: February 12, 2018
    Publication date: July 26, 2018
    Inventors: Kenneth E. Stephenson, David Rose, Avtandil Tkabladze, Christian Stoller, John J. Simonetti
  • Publication number: 20180210095
    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: Application
    Filed: January 5, 2018
    Publication date: July 26, 2018
    Inventors: Ken Stephenson, Peter Wraight, Wolfgang Ziegler, John J. Simonetti, Christian Stoller, Irina Molodetsky
  • Publication number: 20180188412
    Abstract: A system for a downhole tool includes an X-ray generator that outputs X-ray radiation into a surrounding sub-surface formation using electrical power received from a power supply and a detector device adjacent the X-ray generator. The detector device includes a first detector with a first radiation sensitivity that outputs a first measurement signal based on interaction between a first portion of the X-ray radiation and the first detector. The detector device also includes a second detector with a second radiation sensitivity adjacent the first detector, where the second detector outputs a second measurement signal based on interaction between a second portion of the X-ray radiation and the second detector.
    Type: Application
    Filed: December 29, 2016
    Publication date: July 5, 2018
    Inventors: Sicco Beekman, Christian Stoller
  • Publication number: 20180188409
    Abstract: A downhole tool includes a radiation generator configured to output radiation using electrical power received from a power supply. A first portion of the radiation is emitted into a surrounding sub-surface formation. The downhole tool also includes a radiation detector coupled proximate the radiation generator. The radiation detector includes a micromesh gaseous detector, and the radiation detector is configured to output a measurement signal based at least in part on interaction between a second portion of the radiation output by the radiation generator and the radiation detector. Additionally, the downhole tool includes a control system communicatively coupled to the radiation generator and the radiation detector. The control system is configured to determine measured characteristics of the radiation output from the radiation generator based at least in part on the measurement signal and to control operation of the radiation generator based at least in part on the measured characteristics.
    Type: Application
    Filed: December 29, 2016
    Publication date: July 5, 2018
    Inventors: Mauro Manclossi, Laurent Laval, Christian Stoller
  • Patent number: 10012756
    Abstract: A method for determining a petrophysical property of a formation includes detecting radiation events resulting from imparting neutrons into the formation at an energy level of at least 1 MeV. The petrophysical property is determined from an elastic scattering cross section of the formation. The elastic scattering cross section is related to a number of detected radiation events.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: July 3, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Tong Zhou, Christian Stoller
  • Patent number: 9952348
    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: October 5, 2017
    Date of Patent: April 24, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Tong Zhou, Christian Stoller
  • Patent number: 9947426
    Abstract: Disclosed is a radiation logging tool, comprising a tool housing; a compact generator that produces radiation; a power supply coupled to the compact generator; and control circuitry. Embodiments of the compact generator comprise a generator vacuum tube comprising a source generating charged particles, and a target onto which the charged particles are directed; and a high voltage supply comprising a high voltage multiplier ladder located laterally adjacent to the generator vacuum tube. The high voltage supply applies a high voltage between the source and the target to accelerate the charged particles to a predetermined energy level. The compact generator also includes an electrical coupling between an output of the high voltage supply and the target of the generator vacuum tube to accommodate the collocated positions of the generator vacuum tube and the high voltage power supply.
    Type: Grant
    Filed: November 15, 2010
    Date of Patent: April 17, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Luke T. Perkins, Christian Stoller, Peter Wraight
  • Publication number: 20180061610
    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: Application
    Filed: October 24, 2017
    Publication date: March 1, 2018
    Inventors: Matthieu Simon, Anthony Durkowski, Christian Stoller
  • Patent number: 9897719
    Abstract: Systems, methods, and devices for inelastic gamma-ray logging are provided. In one embodiment, such a method includes emitting neutrons into a subterranean formation from a downhole tool to produce inelastic gamma-rays, detecting a portion of the inelastic gamma-rays that scatter back to the downhole tool to obtain an inelastic gamma-ray signal, and determining a property of the subterranean formation based at least in part on the inelastic gamma-ray signal. The inelastic gamma-ray signal may be substantially free of epithermal and thermal neutron capture background.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: February 20, 2018
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Kenneth E. Stephenson, David Rose, Avtandil Tkabladze, Christian Stoller, Donna Simonetti