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1. 发明公开

US20230194748A1 Methods and Means for Simultaneous Casing Integrity Evaluation and Cement Inspection in a Multiple-Casing Wellbore Environment 审中-公开
公开(公告)号：US20230194748A1
公开(公告)日：2023-06-22
申请号：US18109940
申请日：2023-02-15
申请人： Visuray Intech Ltd (BVI)
发明人： Philip Teague , Alex Stewart
IPC分类号： G01V5/12 , G01V5/10 , E21B47/005
CPC分类号： G01V5/12 , G01V5/104 , E21B47/005
摘要： An x-ray based cement evaluation tool for measurement of the density of material volumes within single, dual and multiple-casing wellbore environments is provided, wherein the tool uses x-rays to illuminate the formation surrounding a borehole, and a plurality of detectors are used to directly measure the density of the cement annuli and any variations in density within The tool uses x-rays to illuminate the casing surrounding a borehole and a plurality of multi-pixel imaging detectors directly measure the thickness of the casing The tool includes an internal length having a sonde section, wherein the sonde section further includes an x-ray source; a radiation shield for radiation measuring detectors; sonde-dependent electronics; and a plurality of tool logic electronics and PSUs. Other systems and subsystems appropriate for carrying out the foregoing are also disclosed, as are a plurality of example methods of use therefor.

2. 发明申请

US20180113233A1 DETERMINATION OF CONCENTRATION OF CHEMICAL ELEMENTS IN AN EARTH FORMATION FROM NON-COAXIAL DUAL DETECTOR RADIATION MEASUREMENTS 审中-公开
公开(公告)号：US20180113233A1
公开(公告)日：2018-04-26
申请号：US15502578
申请日：2015-12-15
申请人： BAKER HUGHES INCORPORATED
发明人： ALEXANDR ANATOLEVICH VINOKUROV , BAIR VALERYEVICH BANZAROV , NIKOLAY NIKOLAEVICH VELKER , NIKOLAI ALEKSANDROVIC SIMONOV
IPC分类号： G01V5/04
CPC分类号： G01V5/04 , G01V5/06 , G01V5/08 , G01V5/104 , G01V5/107 , G01V5/12
摘要： Methods and devices for evaluating earth formations. Methods include making a plurality of radiation measurements with a GR detector disposed on a carrier in the borehole and a second GR detector disposed on the carrier by positioning the first GR detector and the second GR detector in the borehole at each borehole depth such that the first GR detector is radially offset from the second GR detector with respect to the longitudinal axis of the borehole; making an estimate of a concentration of at least one chemical element in the formation for each borehole depth for each of the first GR detector and the second GR detector from the plurality of measurements; and estimating an actual concentration of the at least one chemical element using the estimates of the concentration for the first GR detector and the estimates of the concentration for the second GR detector for each borehole depth.

3. 发明申请

US20170357027A1 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.

4. 发明申请

US20170146684A1 NEUTRON-GAMMA DENSITY THROUGH NORMALIZED INELASTIC RATIO 审中-公开
公开(公告)号：US20170146684A1
公开(公告)日：2017-05-25
申请号：US15422782
申请日：2017-02-02
申请人： Schlumberger Technology Corporation
发明人： Avtandil Tkabladze , Michael Lynn Evans , Kenneth Edward Stephenson
IPC分类号： G01V5/10
CPC分类号： G01V5/108 , G01V5/104 , G01V5/105 , G01V5/107
摘要： Systems, methods, and devices for determining a neutron-gamma density (NGD) measurement of a subterranean formation that is accurate in both liquid- and gas-filled formations are provided. For example, a downhole tool for obtaining such an NGD measurement may include a neutron generator, a neutron detector, two gamma-ray detectors, and data processing circuitry. The neutron generator may emit neutrons into a formation, causing a fast neutron cloud to form. The neutron detector may detect a count of neutrons representing the extent of the neutron cloud. The gamma-ray detectors may detect counts of inelastic gamma-rays caused by neutrons that inelastically scatter off the formation. Since the extent of the fast neutron cloud may vary depending on whether the formation is liquid- or gas-filled, the data processing circuitry may determine the density of the formation based at least in part on the counts of inelastic gamma-rays normalized to the count of neutrons.

5. 发明授权

US09658361B2 Lithology pair ratio: a ratio-based lithology indicator using pair production 有权
公开(公告)号：US09658361B2
公开(公告)日：2017-05-23
申请号：US13016336
申请日：2011-01-28
申请人： Loren P. Roberts
发明人： Loren P. Roberts
IPC分类号： G01V5/12 , G01V5/10
CPC分类号： G01V5/104
摘要： The present disclosure relates to borehole logging methods and apparatuses for estimating formation properties using nuclear radiation, particularly an apparatus and method for estimating a formation lithology parameter. The method may include using gamma ray count or count rate information to estimate a formation lithology parameter that may be one of, but not limited to: Z2/A, bulk density, Z2*bulk density/A, linear attenuation coefficients, and porosity. The method may include using time-dependent ratios with a pulsed radiation source. The method may also include dividing gamma ray information by time and/or by energy window. The apparatus includes a processor and storage subsystem with a program that, when executed, implements the method.

6. 发明申请

US20160195636A1 ABSOLUTE ELEMENTAL CONCENTRATIONS FROM NUCLEAR SPECTROSCOPY 审中-公开
标题翻译：来自核子光谱的绝对元素浓度
公开(公告)号：US20160195636A1
公开(公告)日：2016-07-07
申请号：US12996533
申请日：2009-06-29
申请人： Jim A. Grau , Markus Berheide , Christian Stoller , Brad Roscoe , James Thornton
发明人： Jim A. Grau , Markus Berheide , Christian Stoller , Brad Roscoe , James Thornton
IPC分类号： G01V5/10
CPC分类号： G01V5/104
摘要： 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.
摘要翻译：提供了用于从中子诱导的γ射线光谱估计地下地层的绝对元素浓度的系统和方法。在一个示例中，用于估计地下地层中的元素的绝对产量的系统可以包括井下工具和数据处理电路。井下工具可以包括将中子发射到地层中的中子源，用于检测发射的中子的计数速率的中子监测器，以及γ射线检测器，以获得至少部分地从非弹性γ射线得到的γ射线谱由非弹性散射事件和中子俘获伽马射线产生的中子捕获事件。数据处理电路可以被配置为确定来自伽马射线光谱的相对元素产量，并且至少部分地基于相对元素产量与发射中子的计数率的归一化来确定绝对元素产量。

7. 发明授权

US09316764B2 Downhole tool for determining formation properties 有权
标题翻译：用于确定地层性质的井下工具
公开(公告)号：US09316764B2
公开(公告)日：2016-04-19
申请号：US12921433
申请日：2009-02-27
申请人： Ollivier Faivre , Geoff Weller
发明人： Ollivier Faivre , Geoff Weller
IPC分类号： G01V11/00 , G01V5/10
CPC分类号： G01V11/00 , G01V5/104
摘要： A downhole tool and method for determining properties of a formation. The method comprising irradiating the formation with a nuclear source; performing both a resistivity and a sigma measurement at each of different radial depths into the formation with a plurality of detectors; and inputting the measurements into a predetermined model for determining the properties of the formation.
摘要翻译：一种用于确定地层性质的井下工具和方法。该方法包括用核源照射地层; 在各个不同的径向深度处进行电阻率和西格玛测量，并用多个检测器进入地层; 并将测量值输入到用于确定地层特性的预定模型中。

8. 发明申请

US20160047941A1 GAMMA RAY MEASUREMENT QUALITY CONTROL 审中-公开
标题翻译： GAMMA RAY测量质量控制
公开(公告)号：US20160047941A1
公开(公告)日：2016-02-18
申请号：US14781351
申请日：2014-03-25
申请人： SCHLUMBERGER TECHNOLOGY CORPORATION
发明人： Marie-Laure Mauborgne , Francoise Allioli
IPC分类号： G01V13/00 , G01V5/04
CPC分类号： G01V13/00 , G01V5/045 , G01V5/104
摘要： Methods and apparatus for obtaining neutron population data of a subterranean formation with a downhole tool proximate the subterranean formation in a wellbore extending from a wellsite surface to the formation, wherein surface equipment is located at the wellsite surface. At least one of the downhole tool and the surface equipment is operated to generate a sigma log, determine moment data from the generated sigma log, determine a real quality control factor based on the determined moment data, and determine a theoretical quality control factor based on the generated sigma log. Comparing the determined real and theoretical quality control factors may then be utilized to assess accuracy of the generated sigma log.
摘要翻译：用于从井场表面延伸到地层的井眼中靠近地下地层的井下工具获得地下地层的中子种群数据的方法和装置，其中地面设备位于井场表面。操作井下工具和表面设备中的至少一个以产生σ对数，从生成的σ对数确定力矩数据，基于确定的力矩数据确定实际质量控制因子，并且基于生成的sigma日志。然后可以比较确定的真实和理论质量控制因子来评估生成的σ日志的准确性。

9. 发明申请

US20160003025A1 Casing Inspection Using Pulsed Neutron Measurements 有权
公开(公告)号：US20160003025A1
公开(公告)日：2016-01-07
申请号：US14325255
申请日：2014-07-07
申请人： Schlumberger Technology Corporation
发明人： Sicco Beekman , Tong Zhou , David Alan Rose , Christian Stoller
IPC分类号： E21B47/00
CPC分类号： G01V5/102 , E21B47/00 , E21B47/1015 , G01V5/045 , G01V5/101 , G01V5/104 , G01V5/125
摘要： A method for evaluating wellbore conduit condition includes using measurements of at least one of (i) inelastic gamma rays made during emission a burst of neutrons into the conduit from within the conduit at at least one spaced apart location from a position of the emission and (ii) epithermal neutrons or capture gamma rays therefrom detected at at least two spaced apart locations from the position of the emission within a selected time after the emission. The at least one of the measurements of inelastic gamma rays and epithermal neutron or capture gamma ray counts are characterized to estimate an amount of loss of iron in the conduit.

10. 发明授权

US09057794B2 Method for measuring subterranean formation density using a neutron generator 有权
标题翻译：使用中子发生器测量地层密度的方法
公开(公告)号：US09057794B2
公开(公告)日：2015-06-16
申请号：US13819264
申请日：2011-08-10
申请人： Libai Xu , Kevin S. McKinny , Cornelis Huiszoon
发明人： Libai Xu , Kevin S. McKinny , Cornelis Huiszoon
IPC分类号： G01V5/10
CPC分类号： G01V5/101 , G01V5/104
摘要： A method for determining a bulk formation density using a neutron generator includes detected secondary gamma rays and evaluating the detected gamma rays according to pre-determined selection criteria. Selected gamma rays are then used to compute the formation density. The selection criteria may include, for example, a time delay between the detection of a neutron and an associated particle and/or a direction of propagation of the neutron.
摘要翻译：使用中子发生器确定体积形成密度的方法包括检测到的二次伽马射线，并根据预先确定的选择标准评估所检测的伽马射线。然后使用选定的γ射线来计算地层密度。选择标准可以包括例如中子的检测和相关的粒子之间的时间延迟和/或中子的传播方向。

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