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    Compensated formation saturation using assisted physics and neural networks
    1.
    发明授权
    Compensated formation saturation using assisted physics and neural networks 有权

    公开(公告)号：US11994647B2

    公开(公告)日：2024-05-28

    申请号：US17550588

    申请日：2021-12-14

    Applicant: HALLIBURTON ENERGY SERVICES, INC.

    Inventor： Mayir Mamtimin ,  Jeffrey James Crawford ,  Weijun Guo

    IPC: G01V5/10

    CPC classification number: G01V5/101

    Abstract: Aspects of the subject technology relate to determining holdup compensated formation saturation while refraining from calculating holdup. Inelastic gamma spectrum data for an inelastic gamma spectrum generated downhole in a wellbore can be accessed. Further, capture gamma spectrum data for one or more capture gamma spectrums generated downhole in the wellbore can be accessed. A model that accounts for holdup measurement can be applied to both the inelastic gamma spectrum data and the capture gamma spectrum data to identify a compensated oil saturation for a formation surrounding at least a portion of the wellbore based on both the inelastic gamma spectrum and the one or more capture gamma spectrums.

    CORRECTING BOREHOLE SIGNAL CONTRIBUTIONS FROM NEUTRON-INDUCED GAMMA RAY SPECTROSCOPY LOGS
    2.
    发明申请
    CORRECTING BOREHOLE SIGNAL CONTRIBUTIONS FROM NEUTRON-INDUCED GAMMA RAY SPECTROSCOPY LOGS 审中-公开

    公开(公告)号：US20190219732A1

    公开(公告)日：2019-07-18

    申请号：US15578205

    申请日：2017-06-07

    Applicant: Halliburton Energy Services, Inc.

    Inventor： James E. Galford

    IPC: G01V5/12 ,  G01V5/04 ,  E21B49/00 ,  E21B21/06 ,  E21B41/00

    CPC classification number: G01V5/12 ,  E21B21/06 ,  E21B41/0092 ,  E21B49/005 ,  G01V5/045 ,  G01V5/101

    Abstract: The subject technology relates to estimating borehole contributions to measured calcium and sulfur elemental yields by using a small number of mud properties available from wellsite mud reports at the time of logging. Neutron-induced gamma ray spectroscopy logs may be measured and, more specifically, estimating the borehole contributions to the measured calcium and sulfur elemental yields. The subject technology provides for predicting relative borehole yields as a function of borehole size and a set of properties that describe the composition of various complex drilling mud mixtures based on the elemental atomic number density for the drilling mud. The subject technology generates borehole bias vectors from analysis of the simulated tool responses, and applies a borehole bias vector to a relative elemental yield vector to correct a calcium yield and/or a sulfur yield. Other methods, systems, and computer-readable media are also disclosed.

    METHOD OF ACQUIRING ROCK COMPONENT CONTENT OF STRATUM
    3.
    发明申请
    METHOD OF ACQUIRING ROCK COMPONENT CONTENT OF STRATUM 审中-公开

    公开(公告)号：US20180246254A1

    公开(公告)日：2018-08-30

    申请号：US15942356

    申请日：2018-03-30

    Applicant: PetroChina Company Limited

    Inventor： Hongliang Wu ,  Zhou Feng ,  Ning Li ,  Kewen Wang ,  Qingfu Feng ,  Gong Zhang

    IPC: G01V99/00 ,  E21B49/00 ,  E21B49/02 ,  E21B49/08

    CPC classification number: G01V99/005 ,  E21B49/00 ,  E21B49/02 ,  E21B49/08 ,  G01V5/101

    Abstract: Disclosed is a method of acquiring the rock component content in a stratum, the method comprising: on the basis of acquired element capture spectroscopy logging data, performing normalization processing on each element yield in the stratum rock components; on the basis of an element yield curve obtained from the normalization processing and a pre-established stratum rock interpretation model, establishing a logging curve response equation set; and utilizing the established logging curve response equation set and an optimization algorithm, calculating the content of a rock component in a stratum. The method and device can directly process element yield data of element capture spectroscopy logging, and can improve the accuracy of calculating the rock component in a stratum.

    Downhole cement evalution using pulsed neutron measurements
    7.
    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

    Applicant: David M. Chace

    Inventor： David M. Chace

    IPC: G01V5/10 ,  E21B47/00

    CPC classification number: G01V5/101 ,  E21B47/0005

    Abstract: 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.

    DIGITAL SPECTROMETER FOR MEASURING IRONIZING RADIATION DOWNHOLE
    8.
    发明申请
    DIGITAL SPECTROMETER FOR MEASURING IRONIZING RADIATION DOWNHOLE 审中-公开

    公开(公告)号：US20170322340A1

    公开(公告)日：2017-11-09

    申请号：US15148651

    申请日：2016-05-06

    Applicant: BAKER HUGHES INCORPORATED

    Inventor： QUMING ZHOU ,  TOYLI ANNIYEV ,  FEYZI INANC ,  STEVEN BLIVEN

    IPC: G01V5/04 ,  G01V5/10 ,  G01V5/06

    CPC classification number: G01V5/045 ,  G01V5/06 ,  G01V5/101 ,  G01V5/102 ,  G01V5/12

    Abstract: Systems, methods, and devices for evaluating an earth formation intersected by a borehole. Apparatus may include at least one radiation detector configured to generate an analog electrical signal responsive to a plurality of radiation events, comprising absorption of incident ionizing radiation at a corresponding energy level, and an ionizing radiation spectrometer configured to convert each analog electrical signal from the at least one radiation detector into a plurality of digital signal pulses corresponding to the radiation events and resolve the plurality of digital signal pulses into radiation count information representative of the radiation events. Spectrometers include an input channel for each detector of the at least one radiation detector comprising an analog-to-digital converter (ADC) and configured to convert the analog electrical signal for each detector into the plurality of digital signal pulses; and at least one processor configured to generate the radiation count information.

    Compensated sigma from measurements made by a pulsed neutron instrument
    10.
    发明授权
    Compensated sigma from measurements made by a pulsed neutron instrument 有权

    公开(公告)号：US09798037B2

    公开(公告)日：2017-10-24

    申请号：US14424396

    申请日：2013-09-05

    Applicant: Schlumberger Technology Corporation

    Inventor： Tong Zhou ,  Christian Stoller

    IPC: G01V5/10

    CPC classification number: G01V5/108 ,  G01V5/101 ,  G01V5/102 ,  G01V5/105

    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.

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