公开(公告)号：US6032102A

公开(公告)日：2000-02-29

申请号：US120255

申请日：1998-07-21

Applicant: Nihal I. Wijeyesekera ,  Hugh D. Scott

Inventor： Nihal I. Wijeyesekera ,  Hugh D. Scott

IPC: E21B49/00 ,  G01V5/10 ,  G06F17/00

CPC classification number: G01V5/107

Abstract: The present invention provides for method and an apparatus for determining the porosity of a geological formation surrounding a cased well. The method further comprises of generating neutron pulses that release neutrons into an area adjacent the well, from a neutron source. Neutrons are sensed and a plurality of neutron detector count rates is acquired using at least two neutron source to neutron detector spacings. A timing measurement is acquired at one of the spacings to measure a first depth of investigation. A ratio of the neutron detector count rates is acquired to measure a second depth of investigation. An apparent porosity is calculated using the timing measurements and the ratios of neutron count rates. The effect of a well casing on the calculated apparent porosity is determined in response to at least one of the ratio of neutron detector count rates and the timing measurement. A cement annulus is computed based on the ratios of neutron count rates and the timing measurement. A formation porosity is calculated by performing a correction to the apparent porosity for the casing and the cement annulus.

Abstract translation: 本发明提供了用于确定围绕套管井的地质层的孔隙度的方法和装置。 该方法还包括产生从中子源将中子释放到靠近井的区域的中子脉冲。 感测中子并且使用至少两个中子源到中子探测器间隔获取多个中子检测器计数率。 在测量第一深度调查的间隔之一处获取定时测量。 获取中子检测器计数率的比例以测量第二调查深度。 使用时间测量和中子计数率的比率来计算表观孔隙率。 响应于中子检测器计数率和定时测量中的至少一个来确定井套管对计算的表观孔隙度的影响。 基于中子计数率和时间测量的比例计算水泥环。 通过对壳体和水泥环空隙的表观孔隙度进行校正来计算地层孔隙度。

公开(公告)号：US20130299687A1

公开(公告)日：2013-11-14

申请号：US13885668

申请日：2011-11-15

Applicant: Hugh D. Scott ,  Christian Stoller

Inventor： Hugh D. Scott ,  Christian Stoller

IPC: G01V5/10

CPC classification number: G01V5/107 ,  G01V5/101 ,  G01V5/102 ,  G01V5/104

Abstract: A method and apparatus for obtaining neutron images of a rock formation are provided. The neutron images can be obtained from a tool which need not rotate to obtain neutron data from a plurality of azimuthal orientations.

Abstract translation: 提供了一种获得岩层中子图像的方法和装置。 中子图像可以从不需要旋转的工具获得，以从多个方位方向获得中子数据。

公开(公告)号：US5219518A

公开(公告)日：1993-06-15

申请号：US758257

申请日：1991-08-26

Applicant: Donald C. McKeon ,  Jean-Remy Olesen ,  Hugh D. Scott

Inventor： Donald C. McKeon ,  Jean-Remy Olesen ,  Hugh D. Scott

IPC: E21B47/10 ,  G01F1/704 ,  G01F1/708

CPC classification number: E21B47/1015 ,  G01F1/7042 ,  G01F1/708

Abstract: A nuclear spectroscopy method and apparatus for obtaining qualitative and quantitative information related to water flow, comprising the steps of:(1) irradiating the water flow with a source of neutrons of sufficient energy to interact with oxygen atoms in the water according to the activation reaction O.sup.16 (n,p)N.sup.16 ;(2) detecting and counting, with at least at a detector, the gamma rays emitted during disintegration of N.sup.16 ;(3) making a plot of the counts versus time; and(4) deriving from said plot information related to said water flow.The irradiating is advantageously interrupted after a given period of time, and is preferably immediately followed by the detection. The water flow velocity "V" is calculated from the formula V=d/t, where "d" is the distance between the source and the detector(s), and "t" is the time period between the irradiation and the time corresponding to a characteristic on said plot, representative of the water flow and departing from the N.sup.16 exponential decay curve. The characteristic takes different forms on the plot according to the duration of the irradiation.

Abstract translation: 一种用于获得与水流相关的定性和定量信息的核谱分析方法和装置，包括以下步骤：（1）用足够能量的中子源照射水流，以根据活化反应与水中的氧原子相互作用 O16（n，p）N16; （2）至少在检测器处检测和计数在N16分解期间发射的γ射线; （3）制作计数与时间的图; 和（4）从与所述水流相关的所述绘图信息得出。 在给定的时间段之后，有利地中断照射，并且优选紧接着进行检测。 水流速度“V”由公式V = d / t计算，其中“d”是源和检测器之间的距离，“t”是照射时间与对应的时间 到所述图上的特征，代表水流并且离开N16指数衰减曲线。 该特征根据照射的持续时间在图上具有不同的形式。

公开(公告)号：US5038033A

公开(公告)日：1991-08-06

申请号：US481134

申请日：1990-02-16

Applicant: James F. Carroll ,  Hugh D. Scott

Inventor： James F. Carroll ,  Hugh D. Scott

IPC: E21B47/10 ,  G01V5/06

CPC classification number: G01V5/06 ,  E21B47/1015

Abstract: In order to properly treat the tubing of an oil producing borehole, and prevent hazard to personnel at the oil production site, the contamination of tubing by the formation of scale or radioactive deposits on the inner wall thereof is determined by measurement of the low-level radiation emitted by the scale and calculation of the radiation level which would be detected in the vicinity of the outer wall of the tubing in the absence of contributions by the radioactivity of surrounding earth formations. This is accomplished by a logging tool and method which includes a sonde which includes a detector and is lowered in the tubing to detect and count the gamma rays emitted by the scale or radioactive deposits at different depths in the borehole tubing. Data processing determines the radioactivity level within the tubing from the measured gamma rays, and calculates from that level the level of radioactivity which would have been detected outside and in the vicinity of the tubing by applying a first tubing thickness attenuation factor. In a preferred embodiment, data processing corrects for the natural background radioactivity level by subtracting a reference natural radio activity level, itself corrected for tubing thickness by applying a second tubing thickness attenuation factor.