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    Simultaneous pulsed neutron well logging
    2.
    发明授权
    Simultaneous pulsed neutron well logging 失效
    同时脉冲中子井记录

    公开(公告)号：US3691378A

    公开(公告)日：1972-09-12

    申请号：US3691378D

    申请日：1970-06-26

    Applicant: DRESSER IND

    Inventor： HOPKINSON ERIC C ,  YOUMANS ARTHUR H

    IPC: G01V5/10 ,  G01V5/00

    CPC classification number: G01V5/105 ,  G01V5/102

    Abstract: Methods and apparatus are disclosed for obtaining simultaneously a well log of the macroscopic thermal neutron cross-section (Neutron Lifetime Log) of formations adjacent a well bore and logs of the capture gamma rays, epithermal neutrons and thermal neutrons returning to a well bore as a result of irradiating the formations adjacent the well bore with pulses of neutrons. The thermal and epithermal neutron logs are obtained by separating the signal from a single detector into two time-dependent groups. Methods and means are also disclosed for combining the capture gamma ray log with the thermal neutron log to obtain a log indicating the salinity of the fluids contained within said formations. Methods and means are also disclosed for combining the epithermal neutron log with the thermal neutron log to obtain a log related to the macroscopic thermal neutron cross-section of the formations. Either or both of these derived logs may be obtained simultaneously with the first suite of logs. The preferred embodiment of the apparatus disclosed herein includes a pulsed source of 14-mev neutrons, a gamma ray detector, and a neutron detector sensitive to both thermal and epithermal neutrons in the subsurface instrument. Surface apparatus includes the appropriate gating circuits and ancillary circuits whereby the gamma rays detected while the neutron source is quiescent are used to form three signals corresponding to the gamma rays detected in three time periods. Similarly, the surface apparatus includes gating and ancillary circuits to separate the detected neutrons into two time groups.

    Pulsed power supply system for neutron well logging
    4.
    发明授权
    Pulsed power supply system for neutron well logging 失效
    用于中子测井的脉冲供电系统

    公开(公告)号：US3924138A

    公开(公告)日：1975-12-02

    申请号：US26778072

    申请日：1972-06-30

    Applicant: DRESSER IND

    Inventor： HOPKINSON ERIC C

    IPC: H02M3/315 ,  H02M7/523 ,  H03K3/57 ,  G21G4/02 ,  H05H5/00

    CPC classification number: H03K3/57 ,  H02M3/315 ,  H02M7/523

    Abstract: A variable D. C. power supply and a variable A. C. power supply are coupled onto the upper end of a single conductor cable at the earth''s surface and from the lower end of said cable to a well logging instrument. The A. C. voltage is used to provide filament power for the ion source accelerator tube. The D. C. voltage is used to provide power to fixed D. C. loads maintained constant by regulators once a threshold is reached. The D. C. voltage is raised above the threshold to control the pulsed acceleration voltage and hence neutron output by first feeding into a unijunction relaxation oscillator in combination with an SCR output which output is transformer coupled into a voltage multiplier circuit. An antilatch feature is provided for the SCR by transformer coupling the pulses on the SCR anode back to the base of a transistor in series with the cathode of the SCR. Two outputs of the voltage multiplier circuit are connected to the cathode and anode, respectively, of an ion source accelerator tube, the cathode being connected through a resistor to retard the ripple pulsing of the cathode to allow ionization of the accelerator tube.

    Abstract translation: 变量D.C电源和变量A.C电源耦合到单个导体电缆在地球表面和从所述电缆的下端到测井仪器的上端。 A. C.电压用于为离子源加速管提供灯丝功率。 一旦达到阈值，则使用D.C电压为固定的D.C负载提供电力。由负载维持恒定。 D.C.电压升高到高于阈值以控制脉冲加速电压，从而通过首先馈送到单结张弛振荡器与SCR输出结合，输出变换器耦合到电压倍增器电路中来控制中子输出。 通过变压器将SCR阳极上的脉冲耦合到与SCR的阴极串联的晶体管的基极，为SCR提供了一个防污特征。 电压倍增器电路的两个输出分别连接到离子源加速管的阴极和阳极，阴极通过电阻器连接以延迟阴极的脉动脉冲，以允许加速管的电离。

    Pulsed neutron well logging apparatus having means to vary the neutron generator pulse repetition rate
    5.
    发明授权
    Pulsed neutron well logging apparatus having means to vary the neutron generator pulse repetition rate 失效
    具有改变中性粒子发生器脉冲重复率的手段的脉冲中子井记录装置

    公开(公告)号：US3705304A

    公开(公告)日：1972-12-05

    申请号：US3705304D

    申请日：1967-05-31

    Applicant: DRESSER IND

    Inventor： HOPKINSON ERIC C ,  YOUMANS ARTHUR H

    IPC: G01V5/10 ,  G01V5/00

    CPC classification number: G01V5/102

    Abstract: A bistable multivibrator or scale of two circuit is inserted in the sync pulse line before a pulsed neutron generator to reduce the pulse repetition rate by a factor of two. The radiation detection system within the borehole instrument is gated in the conventional manner without the repetition rate of its detection gates being reduced by the factor of two. A second bistable multivibrator circuit is inserted in the sync pulse line before the sync pulse cable driver, the second multivibrator circuit causing the surface electronics to accept signal information during the first half of an elongated cycle which has not been corrected for activation background, and to accept information during the second half of the cycle which relates only to activation background. The signal information is combined with the background information to provide data relating to the decline of the thermal neutron population which is independent of the activation background counting rate.

    Abstract translation: 在脉冲中子发生器之前的同步脉冲线中插入双稳态多谐振荡器或两个电路的刻度，以将脉冲重复率降低2倍。 钻孔仪器内的辐射检测系统以常规方式门控，其检测门的重复率降低了二分之一。 第二双稳态多谐振荡器电路插入在同步脉冲电缆驱动器之前的同步脉冲线中，第二多谐振荡器电路使得表面电子器件在未被激活背景校正的细长周期的前半段期间接受信号信息，并且 在周期的后半段接受与激活背景有关的信息。 信号信息与背景信息组合以提供与热中子群体的衰减有关的数据，其与激活背景计数率无关。

    Visual display of the decline of the thermal neutron population in a well borehole
    8.
    发明授权
    Visual display of the decline of the thermal neutron population in a well borehole 失效
    可视化显示一个井眼中的热中子人口的衰落

    公开(公告)号：US3612877A

    公开(公告)日：1971-10-12

    申请号：US3612877D

    申请日：1968-01-23

    Applicant: DRESSER IND

    Inventor： HOPKINSON ERIC C

    IPC: G01V5/10 ,  G01V5/00

    CPC classification number: G01V5/108 ,  G01V5/102

    Abstract: A well logging instrument having a pulsed neutron source and a radiation detector is adapted for travel through an earth borehole. The signal pulses from the detector are sent to the surface electronics, along with the neutron source synchronization pulses. In the surface electronics, the signal pulses are separated from the synchronization pulses. The synchronization pulses then drive a sawtooth generator, the duration of the ramp function being equal to the separation between the synchronization pulses. The signal pulses are coupled through a variable gain amplifier to a multichannel pulse height analyzer, the gain of the amplifier being a function of the slope of the ramp function. The multichannel pulse height analyzer drives an oscilloscope, thus providing a visual display of the declining curve representative of the signal pulses from the borehole instrument.

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