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    • 3. 发明授权
    • System and method having radiation intensity measurements with standoff correction
    • 具有距离校正的辐射强度测量的系统和方法
    • US06918293B2
    • 2005-07-19
    • US10409998
    • 2003-04-09
    • Gordon L. MoakeJerome A. Truax
    • Gordon L. MoakeJerome A. Truax
    • G01N9/24G01V5/12E21B49/00
    • G01V5/125G01N9/24
    • We disclose density measurement methods that are accurate over an extended range of standoff distances. One method embodiment includes: a) obtaining a standoff distance, a near detector count rate, and a far detector count rate; b) determining a formation density measurement using near and far detector count rates when the standoff distance is less than a predetermined value; and c) determining the formation density measurement using just the far detector count rate and the standoff distance measurement when the standoff distance is greater than the predetermined value. The method may further include calculating a calibration parameter when the standoff distance is less than the predetermined value. The calibration parameter serves to calibrate a standoff-based correction to the far detector count rate, enabling accurate formation density measurements at large standoff distances. The measurements are made with a rotating logging tool, causing the standoff distance to cycle between large and small values.
    • 我们公开了在扩展距离范围内准确的密度测量方法。 一个方法实施例包括:a)获得间隔距离,近检测器计数率和远检测器计数率; b)当间隔距离小于预定值时,使用近和远的检测器计数率确定地层密度测量; 以及c)当所述间隔距离大于所述预定值时,仅使用所述远检测器计数率和所述间隔距离测量来确定地层密度测量。 所述方法还可以包括当所述支座距离小于所述预定值时计算校准参数。 校准参数用于校准基于距离的校正到远检测器计数率,使得能够在较大间隔距离处进行精确的地层密度测量。 使用旋转测井工具进行测量,使得间隔距离在大小值之间循环。
    • 4. 发明授权
    • Standoff compensation for nuclear logging while drilling systems
    • 在钻井系统中进行核采伐的对等补偿
    • US5486695A
    • 1996-01-23
    • US219062
    • 1994-03-29
    • Ward E. SchultzGordon L. Moake
    • Ward E. SchultzGordon L. Moake
    • E21B47/08E21B47/12E21B49/00G01V5/08G01V5/04
    • E21B47/082E21B47/124E21B49/00G01V5/08
    • A standoff compensation system is disclosed for use in an LWD system implementing gamma density and/or neutron porosity measurements. An acoustic transducer is provided to measure the standoff distance between the logging tool and the borehole wall. The present invention includes a downhole processor for determining a weighting factor for the density and/or porosity measurements based upon the measured standoff distance. The weighting factor can either be calculated by the downhole processor according to a predetermined weighting function, or can be retrieved from a pre-calculated look-up table in ROM. The processor then multiplies the weighting factor by the count data from the sensor to determine a weighted count value. The weighted count values are accumulated during an averaging period and normalized, so that a single normalized count value can be generated and either stored in downhole memory, used immediately, or transmitted by telemetry to the surface.
    • 公开了一种用于实施γ密度和/或中子孔隙度测量的LWD系统中的对立补偿系统。 提供一个声学换能器来测量测井工具与钻孔壁之间的距离。 本发明包括井下处理器,用于基于所测量的间隔距离确定密度和/或孔隙度测量的加权因子。 加权因子可以由井下处理器根据预定的加权函数计算,或者可以从ROM中的预先计算的查找表中检索。 然后处理器将加权因子乘以来自传感器的计数数据,以确定加权计数值。 加权计数值在平均周期内累积并归一化,从而可以生成单个归一化计数值,并存储在井下存储器中,立即使用或通过遥测传输到表面。
    • 5. 发明授权
    • Method and apparatus for measuring velocity of ferromagnetic tubing
    • 用于测量铁磁管速度的方法和装置
    • US4698590A
    • 1987-10-06
    • US843046
    • 1986-03-24
    • Gordon L. MoakeMarvin Milewits
    • Gordon L. MoakeMarvin Milewits
    • E21B17/00E21B19/20G01P3/48E21B47/00G01N27/82
    • E21B19/20E21B17/006E21B47/082G01N27/72
    • A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well. A noncontact velocity detector comprises detector elements generating a first signal dependent upon an applied magnetic field and the velocity of the tubular elements. The first signal is compared to a signal dependent only upon the magnetic field generated in a second element. A pickup coil and Hall effect probes can be used.
    • 公开了一种用于确定管状元件中的缺陷程度的管道脱扣工具,其包括在将井从井中移除期间在地下油井或气井中使用的连续柱。 测量局部缺陷和轴向延伸的缺陷以及管状元件的平均壁厚。 通过测量管状元件从井中移除的可变速度来确定缺陷的位置。 非接触速度检测器包括检测器元件,其根据所施加的磁场和管状元件的速度产生第一信号。 将第一信号与仅依赖于在第二元件中产生的磁场相关的信号进行比较。 可以使用拾音线圈和霍尔效应探头。
    • 6. 发明授权
    • Method and apparatus for measuring velocity of ferromagnetic tubing
    • 用于测量铁磁管速度的方法和装置
    • US4578642A
    • 1986-03-25
    • US599227
    • 1984-04-11
    • Gordon L. MoakeMarvin Milewits
    • Gordon L. MoakeMarvin Milewits
    • E21B17/00E21B19/20E21B47/00G01N27/72
    • E21B19/20E21B17/006E21B47/082G01N27/72
    • A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well. A noncontact axial velocity detector comprises detector elements generating a first signal dependent upon an applied magnetic field and the axial velocity of the tubular elements. The first signal is compared to a signal dependent only upon the magnetic field generated in a second element. A pickup coil and Hall effect probes can be used.
    • 公开了一种用于确定管状元件中的缺陷程度的管道脱扣工具,其包括在将井从井中移除期间在地下油井或气井中使用的连续柱。 测量局部缺陷和轴向延伸的缺陷以及管状元件的平均壁厚。 通过测量管状元件从井中移除的可变速度来确定缺陷的位置。 非接触轴向速度检测器包括检测器元件,其根据所施加的磁场和管状元件的轴向速度产生第一信号。 将第一信号与仅依赖于在第二元件中产生的磁场相关的信号进行比较。 可以使用拾音线圈和霍尔效应探头。
    • 10. 发明授权
    • Four-detector formation-density tool for use in cased and open holes
    • 用于套管和开孔的四检测器形成密度工具
    • US5627368A
    • 1997-05-06
    • US498069
    • 1995-07-05
    • Gordon L. Moake
    • Gordon L. Moake
    • G01V5/12
    • G01V5/12
    • An improved formation density logging tool is provided that is effective in cased holes. The improved tool utilizes four detectors which generate four signals enabling the operator to calculate the four unknown variables of interest: formation density, cement thickness, cement density and casing thickness. By providing a means for calculating cement thickness, cement density and casing thickness, a more accurate calculation of formation density is provided. Further, by providing a means for calculating cement thickness, cement density and casing thickness, a more accurate neutron-porosity measurement can be made when the density tool is used in combination with a neutron tool. The tool comprises improvement over currently-available two-detector density tools which are normally useful only in open holes. It is anticipated that the tool provided herein will be useful in both open and cased holes; it is also anticipated that the casing thickness and cement thickness calculations of the tool will be used to enhance the porosity calculation of neutron-porosity tools.
    • 提供了一种改进的地层密度测井工具,其在套管孔中是有效的。 改进的工具使用四个检测器,其产生四个信号,使得操作者能够计算四个未知变量:地层密度,水泥厚度,水泥密度和套管厚度。 通过提供计算水泥厚度,水泥密度和套管厚度的方法,提供了更精确的地层密度计算。 此外,通过提供计算水泥厚度,水泥密度和套管厚度的方法,当密度工具与中子工具组合使用时,可以进行更准确的中子孔隙度测量。 该工具包括对目前可用的双检测器密度工具的改进,其通常仅在开孔中有用。 预期本文提供的工具将在开放和套管孔中都是有用的; 还预计该工具的套管厚度和水泥厚度计算将用于增强中子孔隙度工具的孔隙度计算。