公开(公告)号：US20170045639A1

公开(公告)日：2017-02-16

申请号：US14823532

申请日：2015-08-11

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou

IPC: G01V5/10

CPC classification number: G01V5/102 ,  G01V5/101

Abstract: A method for evaluating a formation includes determining a number of detected gamma rays resulting from imparting neutrons into a formation. The detected gamma rays are each characterized by an energy level thereof The gamma rays are detected at a first distance from a position of imparting the neutrons into the formation. Those of the detected gamma rays attributable to neutron capture by hydrogen nuclei are removed from the number of detected gamma rays. The number of detected gamma rays having hydrogen neutron capture gamma rays removed therefrom are used to calculate a property of the formation.

Abstract translation: 用于评估地层的方法包括确定通过将中子赋予地层而产生的检测到的伽马射线的数量。 所检测的伽马射线的每个特征都在于能量水平。在从施加中子到地层的位置的第一距离处检测伽马射线。 从被检测到的伽马射线的数量中去除归因于氢核的中子捕获的检测到的伽马射线。 使用从其中去除了氢中子俘获伽马射线的检测到的伽马射线的数量来计算地层的性质。

公开(公告)号：US20160349399A1

公开(公告)日：2016-12-01

申请号：US14726111

申请日：2015-05-29

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou

IPC: G01V5/10

CPC classification number: G01V5/102 ,  G01V5/101

Abstract: A method for determining hydrogen index includes using measurements of gamma rays detected during operation of a pulsed neutron source and numbers of thermal neutron capture gamma rays made at at least two different axial spacings from a pulsed neutron source. Either a first ratio of or a first logarithm of the first ratio of the burst gamma rays is determined for a first and second axial distance from the neutron source. A second logarithm is determined of a second ratio of the thermal neutron capture gamma rays detected at a first axial spacing with respect to the numbers detected at a second axial spacing. A corrected second ratio of the numbers of thermal neutron capture gamma rays is determined using either (i) the first logarithm and (ii) the first ratio, and the second logarithm. The corrected second ratio is used to determine the hydrogen index.

Abstract translation: 用于确定氢指数的方法包括使用在脉冲中子源的操作期间检测到的伽马射线的测量以及在与脉冲中子源的至少两个不同的轴向间隔处制造的热中子俘获伽马射线的数量。 对于与中子源的第一和第二轴向距离，确定突发伽马射线的第一比率的第一比值或第一对数。 确定在第一轴向间隔处检测到的热中子俘获伽马射线相对于在第二轴向间隔处检测到的数量的第二比率的第二对数。 使用（i）第一对数和（ii）第一比例和第二对数来确定热中子俘获伽马射线数量的校正的第二比率。 使用校正的第二比例来确定氢指数。

公开(公告)号：US09477006B2

公开(公告)日：2016-10-25

申请号：US14325234

申请日：2014-07-07

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  David Alan Rose ,  Sicco Beekman

IPC: G01V5/08 ,  G01V5/10 ,  G01V5/12

CPC classification number: G01V5/102 ,  G01V5/10 ,  G01V5/101 ,  G01V5/125

Abstract: A method for well logging includes emitting a plurality of bursts of high energy neutrons into a wellbore and formations surrounding the wellbore. During and for a selected duration after at least one of the plurality of bursts, gamma rays are detected at at least one location spaced apart from the emitting and characterizing an energy of the detected gamma rays. After the last burst, gamma rays are detected and energy spectrum and rates of detection with respect to time thereof are determined. The foregoing is repeated for a selected number of times. After the selected number of times background gamma rays are measured. At least one of the numbers of detected gamma rays during a selected time interval and an energy spectrum of the detected gamma rays during the selected time interval is used to determine selected formation properties.

Abstract translation: 用于测井的方法包括将高能中子的多个脉冲串发射到井眼和围绕井筒的地层。 在多个突发中的至少一个脉冲串之后的期间和期间，在与发射间隔开的至少一个位置检测伽马射线并表征检测到的伽马射线的能量。 在最后一次爆发之后，检测到伽马射线，并且确定了相对于其时间的能量谱和检测速率。 上述内容重复选定次数。 在选定次数后测量背景伽马射线。 在所选择的时间间隔期间检测到的伽马射线的数量中的至少一个以及所选择的时间间隔期间检测到的伽马射线的能谱被用于确定所选择的地层特性。

公开(公告)号：US20160223708A1

公开(公告)日：2016-08-04

申请号：US15096069

申请日：2016-04-11

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  Christian Stoller

IPC: G01V5/10

CPC classification number: G01V5/107 ,  G01N33/24 ,  G01V5/101

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 related to a number of detected radiation events.

Abstract translation: 用于确定地层的岩石物理性质的方法包括检测以至少1MeV的能级施加中子到地层中产生的辐射事件。 岩石物理性质由地层的弹性散射截面确定。 与多个检测到的辐射事件相关的弹性散射截面。

公开(公告)号：US20160077234A1

公开(公告)日：2016-03-17

申请号：US14787352

申请日：2014-04-30

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Tong Zhou ,  Sicco Beekman ,  Scott H. Fricke

IPC: G01V5/10

CPC classification number: G01V5/102 ,  G01V5/101

Abstract: A method for determining thermal neutron decay constant for a formation includes counting radiation events corresponding to numbers of thermal neutrons with respect to time (decay spectrum) after irradiating the formation with neutrons. At least one moment of a first order of the decay spectrum or a single exponential curve to fit the decay spectrum is determined. A first apparent decay constant from the at least one moment or the single exponential curve. A second apparent decay constant is determined either by repeating the calculating a moment or exponential curve for different time segments of the decay spectrum or by using radiation events detected by at least a second radiation detector at a different spacing from a position of the irradiating than the at least a first radiation detector to determine a second apparent decay constant. A wellbore corrected thermal neutron decay constant is determined from the first and second apparent decay constants.

Abstract translation: 用于确定地层的热中子衰变常数的方法包括在用中子照射地层之后相对于时间（衰变谱）计数对应于热中子数的辐射事件。 确定衰减光谱的第一阶的至少一个时刻或适合衰变光谱的单个指数曲线。 从至少一个时刻或单个指数曲线的第一个明显的衰减常数。 第二明显衰减常数是通过重复计算衰减谱的不同时间段的时刻或指数曲线，或者通过使用与至少第二辐射检测器检测到的辐射事件不同于照射位置的距离来确定 至少第一辐射检测器，用于确定第二明显衰减常数。 根据第一和第二表观衰减常数确定井筒校正的热中子衰减常数。

公开(公告)号：US20160003969A1

公开(公告)日：2016-01-07

申请号：US14325234

申请日：2014-07-07

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  David Alan Rose ,  Sicco Beekman

IPC: G01V5/10

CPC classification number: G01V5/102 ,  G01V5/10 ,  G01V5/101 ,  G01V5/125

Abstract: A method for well logging includes emitting a plurality of bursts of high energy neutrons into a wellbore and formations surrounding the wellbore. During and for a selected duration after at least one of the plurality of bursts, gamma rays are detected at at least one location spaced apart from the emitting and characterizing an energy of the detected gamma rays. After the last burst, gamma rays are detected and energy spectrum and rates of detection with respect to time thereof are determined. The foregoing is repeated for a selected number of times. After the selected number of times background gamma rays are measured. At least one of the numbers of detected gamma rays during a selected time interval and an energy spectrum of the detected gamma rays during the selected time interval is used to determine selected formation properties.

Abstract translation: 用于测井的方法包括将高能中子的多个脉冲串发射到井眼和围绕井筒的地层。 在多个突发中的至少一个脉冲串之后的期间和期间，在与发射间隔开的至少一个位置检测伽马射线并表征检测到的伽马射线的能量。 在最后一次爆发之后，检测到伽马射线，并且确定了相对于其时间的能量谱和检测速率。 上述内容重复选定次数。 在选定次数后测量背景伽马射线。 在所选择的时间间隔期间检测到的伽马射线的数量中的至少一个以及所选择的时间间隔期间检测到的伽马射线的能谱被用于确定所选择的地层特性。

公开(公告)号：US20140339410A1

公开(公告)日：2014-11-20

申请号：US13895201

申请日：2013-05-15

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  Sicco Beekman ,  Timothy M. Quinlan

IPC: G01V5/10

CPC classification number: G01V5/108 ,  G01V5/101

Abstract: A method for characterizing wellbore response of a pulsed neutron instrument includes inserting a pulsed neutron instrument into a plurality of simulated wellbores each filled with materials representing gas and liquid and measuring response of the pulsed neutron instrument in the simulated wellbores.

Abstract translation: 用于表征脉冲中子仪器的井筒响应的方法包括将脉冲中子仪器插入到多个模拟井筒中，每个模拟井筒填充有代表气体和液体的材料，并测量脉冲中子仪器在模拟井筒中的响应。

公开(公告)号：US11105952B2

公开(公告)日：2021-08-31

申请号：US16263603

申请日：2019-01-31

Applicant: Schlumberger Technology Corporation

Inventor： Pascal Millot ,  Adil Busaidy ,  Jeffrey Miles ,  Tong Zhou ,  Christian Stoller ,  David Rose ,  Richard Radtke

IPC: G01V11/00 ,  G01V5/10 ,  E21B47/12

Abstract: A presence of cement may be identified based on a downhole tool that may emit neutrons into a wellbore having at least one cement casing. The neutrons may interact with the particular material via inelastic scattering, inelastic neutron reactions, capture of neutrons and/or neutron activation through one of these reactions and cause a material to emit an energy spectrum of gamma rays, and wherein the downhole tool is configured to detect an energy spectrum of the gamma rays that is specific to at least one of a plurality of elements and associated a region within the wellbore. An amount of elements, such as calcium and silicon, may be determined from the gamma ray spectra that may indicate a present of cement within the wellbore.

公开(公告)号：US10746895B2

公开(公告)日：2020-08-18

申请号：US16670002

申请日：2019-10-31

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  Christian Stoller ,  James Leslie Thornton ,  David Alan Rose

IPC: G01V5/10 ,  G01N33/24

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.

公开(公告)号：US20200081149A1

公开(公告)日：2020-03-12

申请号：US16670002

申请日：2019-10-31

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  Christian Stoller ,  James Leslie Thornton ,  David Alan Rose

IPC: G01V5/10

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.