公开(公告)号：US20190049620A1

公开(公告)日：2019-02-14

申请号：US16163888

申请日：2018-10-18

Applicant: Schlumberger Technology Corporation

Inventor： Frederic Gicquel ,  Olivier G. Philip ,  Christian Stoller ,  Zilu Zhou

IPC: G01V5/10 ,  G01T1/24 ,  G01V5/08

CPC classification number: G01V5/107 ,  G01T1/241 ,  G01V5/08

Abstract: Devices and methods for a rugged semiconductor radiation detector are provided. The semiconductor detector may include a hermetically sealed housing and a semiconductor disposed within the housing that has a first surface and a second surface opposite one another. A first metallization layer may at least partially cover the first surface of the semiconductor and a second metallization layer may at least partially cover the second surface of the semiconductor. The first metallization layer or the second metallization layer, or both, do not extend completely to an edge of the semiconductor, thereby providing a nonconductive buffer zone. This reduces electrical field stresses that occur when a voltage potential is applied between the first metallization layer and the second metallization layer and reduces a likelihood of electrical failure (e.g., due to arcing).

公开(公告)号：US10102998B2

公开(公告)日：2018-10-16

申请号：US15791818

申请日：2017-10-24

Applicant: Schlumberger Technology Corporation

Inventor： Matthieu Simon ,  Anthony Durkowski ,  Christian Stoller

IPC: H01J35/02 ,  H01J37/06 ,  E21B47/01 ,  E21B47/08 ,  G01N23/20 ,  G01V5/04 ,  G01V5/12 ,  G01V3/12 ,  G01V3/30 ,  G01N23/20008 ,  G01V5/00 ,  E21B47/10 ,  H02M7/10 ,  H05G1/10 ,  H05H3/06 ,  H05H5/04 ,  H01J3/02 ,  H01J43/04 ,  G01N9/24 ,  G01N35/00 ,  E21B49/00

Abstract: A well-logging tool may include a sonde housing, and a radiation generator carried by the sonde housing. The radiation generator may include a generator housing, a target carried by the generator housing, a charged particle source carried by the generator housing to direct charged particles at the target, and at least one voltage source coupled to the charged particle source. The at least one voltage source may include a voltage ladder comprising a plurality of voltage multiplication stages coupled in a bi-polar configuration, and at least one loading coil coupled at at least one intermediate position along the voltage ladder. The well-logging tool may further include at least one radiation detector carried by the sonde housing.

公开(公告)号：US10012756B2

公开(公告)日：2018-07-03

申请号：US15096069

申请日：2016-04-11

Applicant: Schlumberger Technology Corporation

Inventor： Tong Zhou ,  Christian Stoller

IPC: G01V5/12 ,  G01V5/10 ,  G01N33/24

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 is related to a number of detected radiation events.

公开(公告)号：US09897718B2

公开(公告)日：2018-02-20

申请号：US15104354

申请日：2014-12-17

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Marie-Laure Mauborgne ,  Ahmed Amine Mahjoub ,  Markus Berheide ,  Christian Stoller

IPC: G01V5/10

CPC classification number: G01V5/101

Abstract: Methods and downhole tools involving neutron-absorbing gamma ray windows are provided. One such method involves emitting neutrons from a neutron source in a downhole tool in a well into a surrounding geological formation. This may produce formation gamma rays through interactions between the neutrons and elements of the geological formation. The formation gamma rays may be detected by a gamma ray detector when the gamma rays pass via a gamma ray window that includes a neutron-absorbing material disposed in a substrate material of the downhole tool. The gamma ray window may be both more transmissive of gamma rays than the substrate material and less transmissive of neutrons than a window without the neutron-absorbing material. This may decrease a neutron flux that would otherwise reach the gamma ray detector and the tool materials surrounding it and thus would otherwise lead to a background signal contaminating a signal corresponding to the detected formation gamma rays.

公开(公告)号：US20180031725A1

公开(公告)日：2018-02-01

申请号：US15725403

申请日：2017-10-05

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.

公开(公告)号：US20170363770A1

公开(公告)日：2017-12-21

申请号：US15182686

申请日：2016-06-15

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Marie-Laure Mauborgne ,  Francoise Allioli ,  Fabien Haranger ,  Christian Stoller

IPC: G01V13/00 ,  G01V5/06

CPC classification number: G01V13/00 ,  G01V5/06 ,  G01V5/101

Abstract: The disclosure relates to a method for correcting a downhole natural gamma-ray measurement performed in a wellbore. A gamma-ray measurement including at least a gamma-ray count rate is obtained by a gamma-ray detector disposed in a bottom hole assembly having a mud channel inside of the assembly, such that mud flows downwards in the mud channel and upwards outside of the assembly and a neutron source situated above the gamma-ray detector and activating the mud. The method includes: Determining from the gamma-ray measurement an interval count rate corresponding to a count rate of gamma-rays having an energy within a predetermined correction interval; Computing an outside and an inside calibration ratio (ratio of a gamma ray count rate in the correction interval to a gamma-ray count rate outside of the correction interval) representative of gamma-rays generated by an activation of mud flowing respectively outside of the assembly and inside of the assembly, Based on the outside calibration ratio and the interval count rate, determining a first correction count rate, Based on at least the inside and the outside calibration ratios, determining a second correction count rate, Subtracting from the total count rate the first and second correction count rates in order to get a natural gamma-ray measurement corrected for mud activation.

公开(公告)号：US20160349398A1

公开(公告)日：2016-12-01

申请号：US14726050

申请日：2015-05-29

Applicant: Schlumberger Technology Corporation

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

IPC: G01V5/10 ,  E21B49/00

CPC classification number: G01V5/10 ,  G01N33/24 ,  G01V5/104 ,  G01V5/107 ,  G01V5/108

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.

Abstract translation: 确定地层的至少一个部件的分数体积的方法包括：以至少1百万电子伏特（MeV）的能级将中子递送到地层中来进入计算机中的多个检测到的辐射事件。 检测到的辐射事件对应于所赋予的中子和热或超热能中子的能级中的至少一个。 进行地层至少一个附加岩石物理参数的测量。 在计算机中使用从检测到的辐射事件确定的至少一个额外的岩石物理参数测量以及快中子横截面和热中子截面中的至少一个，以确定所述至少一个部件的分数体积 形成。 在另一个实施例中，快中子横截面和热中子横截面可以组合使用以确定分数体积。

公开(公告)号：US20160320521A1

公开(公告)日：2016-11-03

申请号：US15104354

申请日：2014-12-17

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Marie-Laure Mauborgne ,  Ahmed Amine Mahjoub ,  Markus Berheide ,  Christian Stoller

IPC: G01V5/10

CPC classification number: G01V5/101

Abstract: Methods and downhole tools involving neutron-absorbing gamma ray windows are provided. One such method involves emitting neutrons from a neutron source in a downhole tool in a well into a surrounding geological formation. This may produce formation gamma rays through interactions between the neutrons and elements of the geological formation. The formation gamma rays may be detected by a gamma ray detector when the gamma rays pass via a gamma ray window that includes a neutron-absorbing material disposed in a substrate material of the downhole tool. The gamma ray window may be both more transmissive of gamma rays than the substrate material and less transmissive of neutrons than a window without the neutron-absorbing material. This may decrease a neutron flux that would otherwise reach the gamma ray detector and the tool materials surrounding it and thus would otherwise lead to a background signal contaminating a signal corresponding to the detected formation gamma rays.

Abstract translation: 提供了涉及中子吸收伽马射线窗的方法和井下工具。 一种这样的方法包括从井中的井下工具中的中子源发射中子到周围的地质层。 这可能通过中子和地质构造元素之间的相互作用产生形成γ射线。 伽马射线通过包括设置在井下工具的基底材料中的中子吸收材料的伽马射线窗口时，伽马射线检测器可以检测形成γ射线。 与没有中子吸收材料的窗口相比，伽马射线窗口可以比衬底材料更能够透射伽马射线，并且对中子的透射较少。 这可能会降低否则会到达伽马射线探测器和围绕它的工具材料的中子通量，从而否则会导致背景信号污染对应于检测到的地层伽马射线的信号。

公开(公告)号：US09310515B2

公开(公告)日：2016-04-12

申请号：US14222397

申请日：2014-03-21

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Tong Zhou ,  Christian Stoller

IPC: G01V5/12 ,  G01V5/10 ,  G01N33/24

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：US20150185336A1

公开(公告)日：2015-07-02

申请号：US14643988

申请日：2015-03-10

Applicant: Schlumberger Technology Corporation

Inventor： Christian Stoller ,  Robert A. Adolph ,  Bradley A. Roscoe

IPC: G01T1/202 ,  G01V5/10

CPC classification number: G01T1/202 ,  G01T1/20 ,  G01V5/00 ,  G01V5/10

Abstract: Systems, methods, and devices for thermally protecting a scintillator crystal of a scintillation detector are provided. In one example, a thermally-protected scintillator may include a scintillator crystal and a thermal protection element, which may partially surround the scintillator crystal. The thermal protection element may be configured to prevent the scintillator crystal from experiencing a rate of change in temperature sufficient to cause cracking or non-uniform light output, or a combination thereof.

Abstract translation: 提供了用于热保护闪烁体检测器的闪烁体晶体的系统，方法和装置。 在一个示例中，热保护闪烁器可以包括可以部分地围绕闪烁体晶体的闪烁体晶体和热保护元件。 热保护元件可以被配置为防止闪烁体晶体经历足以引起开裂或不均匀光输出的温度变化率，或其组合。