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1509 条记录 (耗时 0.026 秒)

    LONG-LIFETIME, HIGH-YIELD, FAST NEUTRONS SOURCE
    51.
    发明申请
    LONG-LIFETIME, HIGH-YIELD, FAST NEUTRONS SOURCE 审中-公开

    公开(公告)号：US20180246249A1

    公开(公告)日：2018-08-30

    申请号：US15754259

    申请日：2015-11-11

    申请人： Halliburton Energy Services, Inc.

    发明人： Juan NAVARRO-SORROCHE ,  Weijun GUO

    IPC分类号： G01V5/10 ,  E21B49/00

    CPC分类号： G01V5/107 ,  E21B47/00 ,  E21B49/00 ,  G01V5/10

    摘要： A neutron generator includes a gas control interface and a vacuum chamber coupled to the gas control interface. The neutron generator also includes a target rod disposed within the vacuum chamber and having a longitudinal axis aligned with a central axis of the vacuum chamber, and further including a target disposed on a surface of the target rod facing the getter. The neutron generator also includes a planar ion source adjacent to the gas control interface and disposed between the target and the gas control interface. The planar ion source includes an array grid that is offset from the target and generally perpendicular to the longitudinal axis of the target rod.

    Methods for Precise Output Voltage Stability and Temperature Compensation of High Voltage X-ray Generators Within the High-Temperature Environments of a Borehole
    52.
    发明申请
    Methods for Precise Output Voltage Stability and Temperature Compensation of High Voltage X-ray Generators Within the High-Temperature Environments of a Borehole 审中-公开

    公开(公告)号：US20180239052A1

    公开(公告)日：2018-08-23

    申请号：US15955263

    申请日：2018-04-17

    申请人： Philip Teague ,  Long Yu

    发明人： Philip Teague ,  Long Yu

    IPC分类号： G01V5/10 ,  G21G4/02 ,  H05G1/20 ,  G01V5/12

    摘要： A control mechanism for a high-voltage generator for supplying voltage and current to an electronic radiation source in high-temperature environments is provided, the control mechanism including at least one voltage feedback loop for monitoring the output of the generator; at least one environmental temperature monitor; a control bus; and at least one control processor. A method of controlling a high-voltage generator that powers an electronic radiation source in high-temperature environments is also provided, the method including at least: measuring the output voltage of the generator; measuring the temperature within the generator's environment, using a control mechanism to modify a driving frequency, and using a control mechanism to modify a driving pulse-train, such that changes in properties of the electronic components of the generator as a result of changes in environmental temperature are characterized and the generator's driving signals modified to maintain optimally efficient input parameters for a specific environmental temperature.

    Radiation induced conductivity of oil based mud around pads of electrical imaging tools
    57.
    发明授权
    Radiation induced conductivity of oil based mud around pads of electrical imaging tools 有权

    公开(公告)号：US09903977B2

    公开(公告)日：2018-02-27

    申请号：US15177173

    申请日：2016-06-08

    申请人： BAKER HUGHES INCORPORATED

    发明人： Rocco DiFoggio

    IPC分类号： G01V3/20 ,  G01V5/12 ,  G01V5/10

    CPC分类号： G01V3/20 ,  G01V5/10 ,  G01V5/12

    摘要： Methods, systems, devices, and products for making formation resistivity measurements including reducing the resistivity of the fluid proximate the electrode using ionizing radiation to induce a transient increase in electrical conductivity of the fluid for the resistivity measurement. The fluid may include oil-based mud. Methods include making the downhole measurement using the electrode during the transient increase. An electrode may be disposed on a pad having a bremsstrahlung assembly disposed thereon. Methods may include mitigating effects of an electrical resistivity of the fluid on the formation resistivity measurement by using the radiation to induce a transient increase in electrical conductivity of the fluid for the formation resistivity measurement. Methods may include using the ionizing radiation to generate at least one of: i) free ions; and ii) free electrons.

    Downhole cement evalution using pulsed neutron measurements
    58.
    发明授权
    Downhole cement evalution using pulsed neutron measurements 有权

    公开(公告)号：US09885802B2

    公开(公告)日：2018-02-06

    申请号：US14451584

    申请日：2014-08-05

    申请人： David M. Chace

    发明人： David M. Chace

    IPC分类号： G01V5/10 ,  E21B47/00

    CPC分类号： G01V5/101 ,  E21B47/0005

    摘要： Estimating cement voids in between a casing and a borehole wall of a borehole penetrating the earth formation includes forming with a computing device an actual ratio of radiation induced by a neutron source and measured by a first detector and a second detector when the tool is at two or more different locations in the borehole. A relationship between the actual ratio and the porosity at each of the two or more different locations is used and compared to two different cases of estimates of the ratio. Based on the comparison, an estimate of the cement voids at the two or more locations.

    NEUTRON GAMMA DENSITY CORRECTION USING ELEMENTAL SPECTROSCOPY
    59.
    发明申请
    NEUTRON GAMMA DENSITY CORRECTION USING ELEMENTAL SPECTROSCOPY 审中-公开

    公开(公告)号：US20170357027A1

    公开(公告)日：2017-12-14

    申请号：US15177427

    申请日：2016-06-09

    申请人： SCHLUMBERGER TECHNOLOGY CORPORATION

    发明人： Michael Lynn Evans

    IPC分类号： G01V5/10

    CPC分类号： G01V5/105 ,  G01V5/104

    摘要： A method for determining a corrected neutron gamma density of a formation includes emitting neutrons into a formation using a neutron source to generate gamma-rays. Additionally, the method includes detecting a first count rate of gamma-rays and a gamma-ray spectrum using at least a gamma-ray detector of the downhole tool. The method also includes detecting a second count rate of neutrons using a neutron detector. The method includes using a processor to perform a gamma-ray spectroscopy analysis on the formation based on the gamma-ray spectrum and determining a correction based on results of the gamma-ray spectroscopy analysis. The method includes applying the correction to the first count rate or the second count rate and determining a neutron gamma density of the formation based on a first corrected count rate of gamma-rays or a second corrected count rate of neutrons. The method also includes outputting the determined density of the formation.

    Neutron generator
    60.
    发明授权
    Neutron generator 有权

    公开(公告)号：US09839112B2

    公开(公告)日：2017-12-05

    申请号：US14645752

    申请日：2015-03-12

    申请人： Schlumberger Technology Corporation

    发明人： Joel L. Groves

    IPC分类号： H05H3/06 ,  G01V5/10 ,  B82Y99/00

    CPC分类号： H05H3/06 ,  B82Y99/00 ,  G01V5/10 ,  H01J2201/30469 ,  Y10S977/963

    摘要： A neutron generator includes an ion source disposed in a pressurized environment containing an ionizable gas. The ion source includes a substrate with a bundle of carbon nanotubes extending therefrom. The ends of the nanotubes are spaced from a grid. Ion source voltage supply circuitry supplies a positive voltage potential between the substrate and the grid of the ion source to cause ionization of the ionizable gas and emission of ions through the grid. An ion accelerator section is disposed between the ion source and a target. The ion accelerator section accelerates ions that pass through the grid towards the target such that collisions of the ions with the target cause the target to generate and emit neutrons therefrom. The ion source, accelerator section and target are housed in a sealed tube and preferably the carbon nanotubes of the bundle are highly ordered with at least 106 carbon nanotubes per cm2 that extend in a direction substantially parallel to the central axis of the tube. The neutron generator provides gas ionization at much higher atomic to molecular ratio that the prior art, which allows for small compact size designs suitable for logging tools that are used in space-constrained downhole environments.