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21.发明申请公开(公告)号：US20190235125A1
公开(公告)日：2019-08-01
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
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.
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22.发明申请公开(公告)号：US20190129061A1
公开(公告)日：2019-05-02
申请号：US15794396
申请日：2017-10-26
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou
Abstract: A system may include a pulsed neutron generator designed to emit neutrons into a borehole of a geological formation using a pulsing scheme. The system may also include a gamma-ray detector designed to take measurements of capture gamma-rays during a time period during the pulsing scheme. The system may also include data processing circuitry designed to calculate one or more sigma values based at least in part on the measurements of the capture gamma-rays taken during the time period during the pulsing scheme. The data processing circuitry may also calculate a factor of yields to weights value based at least in part on the one or more sigma values and convert a plurality of relative yields of corresponding elements in the geological formation to a plurality of elemental relative weights based at least in part on the factor of yields to weights.
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公开(公告)号：US10274637B2
公开(公告)日：2019-04-30
申请号：US14823532
申请日：2015-08-11
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou
IPC: G01V5/10
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.
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公开(公告)号：US20180313973A1
公开(公告)日：2018-11-01
申请号：US16014040
申请日：2018-06-21
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou
IPC: G01V5/10
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.
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公开(公告)号：US09952348B2
公开(公告)日：2018-04-24
申请号：US15725403
申请日：2017-10-05
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou , Christian Stoller
IPC: G01V5/10
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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Patent Agency Ranking
公开(公告)号：US09746582B1
公开(公告)日：2017-08-29
申请号：US15134669
申请日：2016-04-21
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou
IPC: G01V5/10
Abstract: A method for determining a composition of a formation, includes characterizing by energy detected gamma rays resulting from interaction of neutrons that irradiated the formation. Elemental yields are determined by spectrally analyzing the energy characterized gamma rays. A subset of the elemental yields is selected as background yields. The background yields are filtered. An apparent contribution of the filtered background yields to the characterized gamma rays is determined. Foreground elemental yields are determined by spectrally analyzing the characterized gamma rays having the apparent contribution removed.
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公开(公告)号：US20160245948A1
公开(公告)日：2016-08-25
申请号：US15145991
申请日：2016-05-04
Applicant: Schlumberger Technology Corporation
Inventor： Sicco Beekman , Tong Zhou , David Alan Alan , Christian Stoller
CPC classification number: G01V5/102 , E21B47/00 , E21B47/1015 , G01V5/045 , G01V5/10 , G01V5/101 , G01V5/104 , G01V5/125
Abstract: 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.
Abstract translation: 一种用于评估井眼导管状况的方法包括使用以下至少一种的测量：（i）在从发射位置的至少一个间隔开的位置处从导管内将中子爆发期间发射的中子期间产生的非弹性γ射线和（ ii）从发射之后的选定时间内在发射位置的至少两个间隔开的位置处检测到超热中子或捕获其γ射线。 非弹性γ射线和超热中子或捕获伽马射线计数的测量中的至少一个的特征在于估计导管中铁的损失量。
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28.发明申请METHOD FOR USING NEUTRON INTERACTION CROSS SECTION TO INTERPRET NEUTRON MEASUREMENTS 有权使用中子相互作用交叉部分解释中子测量的方法公开(公告)号：US20150268376A1
公开(公告)日：2015-09-24
申请号：US14222397
申请日：2014-03-21
Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
Inventor： Tong Zhou , Christian Stoller
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。
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29.发明申请公开(公告)号：US20150247948A1
公开(公告)日：2015-09-03
申请号：US14424396
申请日：2013-09-05
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou , Christian Stoller
IPC: G01V5/10
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.
Abstract translation: 一种用于通过从高能中子的至少一个爆发产生的辐射测量到围绕井筒的地层的方法来确定地层热中子衰减速率的方法包括确定在结束之后的第一选定时间开始的时间窗中的第一表观中子衰减速率 所述至少一个脉冲串中的第二明显衰减速率来自在所述脉冲串之后的第二选定时间开始的时间窗口和来自所述脉冲串之后的第三选定时间的第三明显衰减速率。 第二次比第一次晚。 确定井筒中流体的热中子捕获截面。 基于第一和第二表观衰减速率以及指示井眼捕获横截面的参数来确定衰减率校正因子。 校正因子应用于第三表观衰减率，以确定地层热中子衰减速率。
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30.发明授权公开(公告)号：US09052405B2
公开(公告)日：2015-06-09
申请号：US13895201
申请日：2013-05-15
Applicant: Schlumberger Technology Corporation
Inventor： Tong Zhou , Sicco Beekman , Timothy M. Quinlan
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。
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