公开(公告)号：US3886355A

公开(公告)日：1975-05-27

申请号：US29471572

申请日：1972-10-03

Applicant: DRESSER IND

Inventor： CULVER RICHARD B

IPC: G01V5/10 ,  G01T1/16

CPC classification number: G01V5/102

Abstract: A fast neutron source is periodically switched between a pulsed mode and a continuous mode. A first gamma ray detection interval follows the pulsed mode to provide an indication of the capture gamma rays. A second detection interval occurs during the continuous mode to provide an indication of the capture gamma rays plus the gamma rays resulting from the inelastic scattering of fast neutrons. The first indication is subtracted from the second, resulting in an indication solely of the gamma rays from inelastic scattering. The pulses occurring in such intervals are further subjected to energy discrimination which provides information relating to carbon and oxygen content, such information being used with a ratio circuit to provide a carbon/oxygen ratio. In another embodiment, a pair of neutron sources, one pulsed, one continuous, provide analogous results. In still another embodiment, the borehole is first logged with a pulsed source and then later with a continuous source. In yet another embodiment, a shielding, rotating disk having alternate short and long windows is used between an alpha particle source and a neutron emitter to simulate the pulsed and continuous modes. An electrical signal functionally related to the lithology of the formations, for example, the silicon/calcium ratio of the formations, is used in conjunction with an electrical signal indicative of the carbon/oxygen ratio to generate an electrical signal indicative of the hydrocarbon saturation of the formations.

Abstract translation: 快中子源在脉冲模式和连续模式之间周期性切换。 第一伽马射线检测间隔跟随脉冲模式以提供捕获伽马射线的指示。 在连续模式期间发生第二检测间隔，以提供捕获伽马射线加上由快中子的非弹性散射产生的伽马射线的指示。 从第二个数据中减去第一个指示，从而仅显示来自非弹性散射的伽马射线。 在这种间隔中发生的脉冲进一步受到能量鉴别，其提供了与碳和氧含量相关的信息，该信息与比率电路一起使用以提供碳/氧比。 在另一个实施例中，一对中子源，一个脉冲的，一个连续的，提供类似的结果。 在另一个实施例中，首先用脉冲源记录钻孔，然后用连续的源记录钻孔。 在另一个实施例中，在α粒子源和中子发射器之间使用具有交替的短和长窗口的屏蔽旋转盘，以模拟脉冲和连续模式。 与地层的岩性（例如地层的硅/钙比）功能相关的电信号与指示碳/氧比的电信号结合使用，以产生指示烃饱和度的电信号 地层。

公开(公告)号：US3668426A

公开(公告)日：1972-06-06

申请号：US3668426D

申请日：1969-07-23

Applicant: DRESSER IND

Inventor： CULVER RICHARD B

IPC: H03K5/22 ,  H03K5/20

CPC classification number: H03K5/22

Abstract: A pair of transistors are each normally biased to saturation, one more strongly than the other. A tunnel diode connected between the collectors, respectively, produces an output voltage only when one of the transistors is driven out of saturation, but not when both transistors are non-saturated. Neither transistor is taken out of saturation until the signal pulse input reaches a certain predetermined amplitude. When the input pulse reaches a second predeterminde amplitude, both transistors are taken out of saturation. Thus, only pulses of amplitudes within a given range produce output signals. In an alternative embodiment, a single transistor replaces the tunnel diode. In another embodiment, the tunnel diode is replaced by a second differential pair of transistors.

Abstract translation: 一对晶体管通常被偏置为饱和，比另一个强一个。 连接在集电极之间的隧道二极管分别仅在晶体管中的一个被驱动到饱和状态之后产生输出电压，但是当两个晶体管都不饱和时，不产生输出电压。 在信号脉冲输入达到一定的预定幅度之前，晶体管都不会脱离饱和。 当输入脉冲达到第二预定值幅度时，两个晶体管都被取消饱和。 因此，只有给定范围内的幅度脉冲才产生输出信号。 在替代实施例中，单个晶体管代替隧道二极管。 在另一个实施例中，隧道二极管由第二差分晶体管对代替。

公开(公告)号：US3885154A

公开(公告)日：1975-05-20

申请号：US41007173

申请日：1973-10-26

Applicant: DRESSER IND

Inventor： CULVER RICHARD B

IPC: G01V5/10 ,  G01T1/30

CPC classification number: G01V5/102

Abstract: The amplified pulses from a radioactivity detector are coupled through a delay line to a linear gate. The amplified pulses from the detector are also connected to a discriminator. The output of the discriminator is AND gated in a logical gate with a clock pulse which is synchronized with a high energy neutron source. The AND gate triggers a first single shot multivibrator which in turn triggers the linear gate. The delay line allows for the time required for the detector pulse to rise to the discriminator threshold and for the propagation delay in the logic circuitry. The linear gate opens before the arrival of the detector pulse and closes after it passes through. A J-K flip-flop circuit is triggered by the trailing edge of the output of the first single shot multivibrator to disable the AND gate, thus causing the linear gate to pass only the first detected pulse having the necessary discriminator level. The output of the AND gate is OR gated with the output of a second single shot multivibrator which is triggered off the trailing edge of the clock pulse. The output of the OR gate drives a negative high voltage pulser which is connected to a negative pulsing ring in a neutron generator. The leading edge of the clock pulse drives a positive high voltage pulser which is connected to a positive pulsing ring in the neutron generator. The neutron generator is thus extinguished upon the detection of the first detector pulse occurring within the clock pulse interval having the necessary discriminator threshold. In an alternative embodiment, a second AND gate is used to gate a source control clock pulse and the output from the J-K flip-flop to provide a driving pulse for the ion source pulser.

Abstract translation: 来自放射性检测器的放大脉冲通过延迟线耦合到线性栅极。 来自检测器的放大脉冲也连接到鉴别器。 鉴别器的输出与逻辑门相配合，并具有与高能量中子源同步的时钟脉冲。 与门触发第一个单次多谐振荡器，它又触发线性门。 延迟线允许检测器脉冲上升到鉴别器阈值和逻辑电路中的传播延迟所需的时间。 线性门在检测器脉冲到达之前打开，并在其通过后关闭。 J-K触发器电路由第一单片多谐振荡器的输出的后沿触发以禁止与门，从而使线性栅极仅通过具有必要鉴别器电平的第一检测脉冲。 与门的输出与门脉冲的后沿触发的第二单次多谐振荡器的输出进行或门控。 或门的输出驱动负高压脉冲发生器，其连接到中子发生器中的负脉冲环。 时钟脉冲的前沿驱动一个正高压脉冲发生器，它连接到中子发生器的正脉冲环。 因此，在检测到具有必要鉴别器阈值的时钟脉冲间隔内发生的第一检测器脉冲之后，中子发生器被熄灭。 在另一实施例中，使用第二与门来栅极源极控制时钟脉冲和来自J-K触发器的输出以提供用于离子源脉冲发生器的驱动脉冲。

公开(公告)号：US3486380A

公开(公告)日：1969-12-30

申请号：US3486380D

申请日：1967-12-21

Applicant: DRESSER IND

Inventor： CULVER RICHARD B

IPC: E21B47/06 ,  G01L7/18 ,  G01N9/26 ,  G01L9/00

CPC classification number: G01N9/26 ,  E21B47/06 ,  G01L7/18 ,  G01N2009/263