公开(公告)号：US4327290A

公开(公告)日：1982-04-27

申请号：US90800

申请日：1979-11-02

申请人： Ronald E. Plasek

发明人： Ronald E. Plasek

IPC分类号： G01V5/10 ,  G01V5/00

CPC分类号： G01V5/102

摘要： The invention relates to a novel method and apparatus for the cyclical timing of the neutron bursts, spectral gates, tau determination gates, and background measurement periods in a capture spectroscopy measurement. Each measurement cycle period is divided in time into 62 tau units, where tau is the thermal decay time constant determined from the immediately preceding cycle period. The neutron accelerator bursts eight times, each burst lasting for one tau unit and beginning at 0, 6, 12, . . . 42 taus. The capture spectral gates, two units long, follow each neutron burst after a one tau unit long delay. Spectral background due to activation is measured in a long background window until tau equals 61, following a two tau delay from the eighth spectral gate and, properly normalized, is subtracted on a channel-by-channel basis from the spectrum accumulated from the capture spectral gates. Tau determination gates I and II follow each neutron burst after a two tau delay. Each gate I is one tau long; each gate II immediately follows gate I and is two tau long. After the eighth gate II, a long gate III (49 tau to 61 tau) is provided for correcting background counts in the tau determination gates I and II.

摘要翻译： 本发明涉及一种用于捕获光谱测量中的中子脉冲串，频谱门，tau确定门和背景测量周期的周期性定时的新方法和装置。 每个测量循环周期在时间上分为62个tau单位，其中τt是从紧接在前的循环周期确定的热衰减时间常数。 中子加速器突发八次，每次突发持续一个tau单位，从0,6,12开始。 。 。 42 taus 捕获光谱门，两个单位长，在一个τ单位长延迟之后跟随每个中子脉冲。 在长的背景窗口中测量由于激活而产生的光谱背景，直到τ等于61，在从第8个频谱门开始的两个ττ延迟之后，并且正确归一化地从逐个信道基础上从从捕获光谱累积的频谱中减去 大门 Tau确定门I和II在两个τ延迟之后跟随每个中子脉冲。 每个门我都是一个长长的 每个门II紧随着门I，并且是两个tau长。 在第八栅极II之后，提供长栅极III（49°至61°），用于校正τ确定栅极I和II中的背景计数。

公开(公告)号：US5842158A

公开(公告)日：1998-11-24

申请号：US811992

申请日：1997-03-05

申请人： Ronald E. Plasek

发明人： Ronald E. Plasek

IPC分类号： G01V1/48 ,  H03H17/02 ,  H03H21/00 ,  G06F17/00

CPC分类号： G01V1/48 ,  H03H17/0255 ,  H03H21/0012

摘要： The invention described herein provides for an intelligent or "adaptable" filtering method that could be applied when filtering log data. In the present invention, for a given filter model, the adaptive filtering technique differentiates between true changes in the formation or borehole quantity measured and what can be considered to be just a "statistical fluctuation". So, when in long constant-value intervals (data deviations do not exceed those predicted by statistical theory) the filter will automatically increase the number of filter levels used, thereby providing a large reduction (smoothing) of the statistical variations. However, when approaching a spot where there is a true change in the quantity being measured (data deviations over and above those predicted by statistics) the filter will automatically and smoothly decrease, on both sides of this spot, thereby preserving the sharpness of the bed boundary or borehole fluid contact and also preserving the true shape of a thin geologic bed.

摘要翻译： 本文描述的本发明提供了在过滤日志数据时可以应用的智能或“适应性”过滤方法。 在本发明中，对于给定的滤波器模型，自适应滤波技术区分测量的形成或钻孔量的真实变化以及可以被认为仅仅是“统计波动”。 因此，当长常数值间隔（数据偏差不超过统计学理论预测值）时，滤波器将自动增加所使用的滤波器数量，从而提供统计变化的大幅减小（平滑）。 然而，当接近正在测量的数量真实变化的位置（数据偏差超过统计预测值）时，过滤器将在该位置的两侧自动平稳地减少，从而保持床的清晰度 边界或井眼液体接触，并保留薄地质床的真实形状。

公开(公告)号：US06389367B1

公开(公告)日：2002-05-14

申请号：US09504528

申请日：2000-02-15

申请人： Ronald E. Plasek

发明人： Ronald E. Plasek

IPC分类号： G06F1900

CPC分类号： G01V5/101

摘要： A method and apparatus for calibrating readings of a downhole tool are provided. The method including collecting data representative of gamma ray photon energies detected by a downhole tool during the well-logging, a spectrum of the gamma ray photon energies detected by the downhole tool having a derivative with respect to the gamma ray photon energies. The method and program comprise calibrating the readings of the downhole tool using at least one predetermined correction factor based on the derivative of the spectrum of the gamma ray photon energies detected by the downhole tool. A computer-readable program storage device and a computer programmed to perform a set of instructions are also provided.

摘要翻译： 提供了一种用于校准井下工具的读数的方法和装置。 所述方法包括收集表示在测井期间由井下工具检测的伽马射线光子能量的数据，由井下工具检测的伽马射线光子能量的光谱相对于伽马射线光子能量具有导数。 该方法和程序包括基于由井下工具检测的伽马射线光子能量的谱的导数，使用至少一个预定的校正因子来校准井下工具的读数。 还提供了一种计算机可读程序存储装置和被编程以执行一组指令的计算机。

公开(公告)号：US5699246A

公开(公告)日：1997-12-16

申请号：US532133

申请日：1995-09-22

申请人： Ronald E. Plasek ,  Christian Stoller ,  Robert A. Adolph

发明人： Ronald E. Plasek ,  Christian Stoller ,  Robert A. Adolph

IPC分类号： E21B47/00 ,  G01V5/10 ,  G01V11/00 ,  E21B49/00 ,  G01V1/28 ,  G01V1/30 ,  G01V1/32

CPC分类号： G01V5/101 ,  E21B47/00 ,  G01V11/00

摘要： The present invention provides a new method to determine corrected characteristics of materials using the measured quantities obtained by a measurement and an extensive set of database points representing laboratory and modeled results in well defined environments. In particular the invention relates to the measurement of the characteristics of the formation around a wellbore as well as of the borehole with a well logging tool. Using a dynamic parametrization technique, the environmental corrections and the transformations from the measured to the physical characteristics can be achieved in a more accurate, robust and flexible way. The dynamic local parametrization is based on a weighted multiple linear regression over the entire database to obtain the local coefficients for the transformation which can be expressed as a simple equation.

摘要翻译： 本发明提供了一种用于通过测量获得的测量量和广泛的数据库点来确定材料的校正特性的新方法，所述数据库点表示在明确定义的环境中的实验室和建模结果。 特别地，本发明涉及使用测井工具测量围绕井眼以及井眼的地层的特征。 使用动态参数化技术，可以以更准确，稳健和灵活的方式实现环境校正和从测量到物理特性的转换。 动态局部参数化是基于整个数据库上的加权多元线性回归，以获得可以表示为简单方程的变换的局部系数。

公开(公告)号：US06289283B1

公开(公告)日：2001-09-11

申请号：US09487061

申请日：2000-01-19

申请人： Ronald E. Plasek

发明人： Ronald E. Plasek

IPC分类号： G01V504

CPC分类号： G01V5/101

摘要： A method and apparatus are provided for correcting gamma ray data representative of gamma ray energies for spectral degradation. The method and apparatus include degrading reference gamma ray spectra. At least one correction factor is calculated between the degraded gamma ray spectra and the reference gamma ray spectra. The gamma ray data are then corrected using a calculated correction factor. Another method is provided for determining a correction factor for correcting data representative of gamma ray energies for spectral degradation. The method includes disposing a downhole tool in a simulated environment representative of actual downhole conditions, the tool including a neutron source and at least one gamma ray detector. The temperature of at least one of the gamma ray detectors of the tool is then varied while the simulated environment is irradiated with neutrons emitted from the neutron source. Gamma ray energy signals are then detected at the at least one detector in response to gamma rays produced during nuclear reactions between the neutrons and materials in and of the simulated environment. A characteristic of the simulated environment is then determined along with a characteristic of the at least one detector. The determined characteristics of the simulated environment and of the at least one detector are then correlated to determine at least one correction factor.

摘要翻译： 提供了一种用于校正代表用于光谱降解的伽马射线能量的伽马射线数据的方法和装置。 该方法和装置包括降解参考伽马射线谱。 在降解的伽马射线光谱和参考伽马射线光谱之间计算至少一个校正因子。 然后使用计算的校正因子校正伽马射线数据。 提供另一种方法用于确定用于校正表示用于光谱降解的伽马射线能量的数据的校正因子。 该方法包括在代表实际井下条件的模拟环境中布置井下工具，所述工具包括中子源和至少一个伽马射线检测器。 然后，在从中子源发射的中子照射模拟环境的同时改变工具的伽马射线检测器中的至少一个的温度。 然后在至少一个检测器处响应于在模拟环境中的中子和材料之间的核反应期间产生的伽马射线来检测伽马射线能量信号。 然后随着至少一个检测器的特性确定模拟环境的特性。 然后将确定的模拟环境和至少一个检测器的特性相关联以确定至少一个校正因子。

公开(公告)号：US5459314A

公开(公告)日：1995-10-17

申请号：US105258

申请日：1993-08-12

申请人： Ronald E. Plasek

发明人： Ronald E. Plasek

IPC分类号： G01V5/12

CPC分类号： G01V5/12

摘要： A method for measuring formation density corrected for activated gamma radiation. The formation adjacent the borehole is irradiated with low energy gamma radiation from a density tool source. At least one gamma ray detection means is spaced longitudinally from the source. A gamma ray spectrum containing gamma rays that result from density source radiation and also activated gamma rays is detected by the detection means. The activated gamma rays are identified and subtracted from the total number of detected gamma rays which results in the gamma ray count from the density tool source. This gamma ray count can then be used in conventional density calculation processes to determine formation density that has been corrected for activated gamma rays caused by naturally occurring gamma radiation and from other logging equipment that induces gamma radiation.

摘要翻译： 一种用于测量激活的伽马辐射校正的地层密度的方法。 邻近钻孔的地层用来自密度工具源的低能γ射线照射。 至少一个伽马射线检测装置与源的纵向隔开。 由检测装置检测包含由密度源辐射和激活的伽马射线产生的伽马射线的伽马射线谱。 识别出激活的伽马射线，并从检测到的伽马射线的总数中减去，从而产生来自密度工具源的伽马射线计数。 然后可以在常规密度计算过程中使用该伽马射线计数，以确定由自然发生的伽马辐射引起的激活的伽马射线和从其他引起伽马射线的测井仪器校正的地层密度。