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1. 发明授权

US5128541A Thermal decay time logging method 失效
标题翻译：热衰减时间测井方法
公开(公告)号：US5128541A
公开(公告)日：1992-07-07
申请号：US104750
申请日：1987-10-05
申请人： Mehrzad Mahdavi , Jean-Remy Olesen , Donald K. Steinman , George C. Summerfield
发明人： Mehrzad Mahdavi , Jean-Remy Olesen , Donald K. Steinman , George C. Summerfield
IPC分类号： G01V5/10
CPC分类号： G01V5/104 , G01V5/107
摘要： A borehole logging method for determining thermal neutron decay characteristics of a formation surrounding the borehole, comprises the following steps. The formation surrounding the borehole is irradiated from a location within the borehole with a burst of neutrons and indications of the concentration of the diffusing thermal neutrons are detected in at least three time gates following the burst of neutrons. Corresponding count rate signals in response to the detected neutrons are produced. Thereafter, the count rate signals are combined in a predetermined manner to separate a characteristic of the thermal neutron decay rate of the formation from associated neutron diffusion characteristics which are monotonically decreasing with time. The steps of irradiating, detecting and combining are then repeated at different depth locations within the borehole and a recording of the rate of decay of thermal neutrons as a function of borehole depth is produced.
摘要翻译：用于确定围绕钻孔的地层的热中子衰变特性的井眼测井方法包括以下步骤。围绕钻孔的地层由钻孔爆发的中子从钻孔内的位置被照射，并且在中子爆发之后的至少三个时间门中检测到扩散热中子的浓度的指示。产生响应于检测到的中子的相应的计数率信号。此后，以预定的方式组合计数速率信号，以将由形成的热中子衰减速率的特性与随时间单调递减的相关联的中子扩散特性相分离。然后在钻孔内的不同深度位置重复照射，检测和组合的步骤，并且记录热中子衰减速率作为钻孔深度的函数。

2. 发明授权

US5219518A Nuclear oxygen activation method and apparatus for detecting and quantifying water flow 失效
标题翻译：用于检测和定量水流的核氧活化方法和装置
公开(公告)号：US5219518A
公开(公告)日：1993-06-15
申请号：US758257
申请日：1991-08-26
申请人： Donald C. McKeon , Jean-Remy Olesen , Hugh D. Scott
发明人： Donald C. McKeon , Jean-Remy Olesen , Hugh D. Scott
IPC分类号： E21B47/10 , G01F1/704 , G01F1/708
CPC分类号： E21B47/1015 , G01F1/7042 , G01F1/708
摘要： 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.
摘要翻译：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。

3. 发明授权

US4950892A Method and tool for gravel pack evaluation 失效
标题翻译：砾石包评估方法和工具
公开(公告)号：US4950892A
公开(公告)日：1990-08-21
申请号：US322795
申请日：1989-03-13
申请人： Jean-Remy Olesen
发明人： Jean-Remy Olesen
IPC分类号： E21B43/04 , E21B47/00
CPC分类号： E21B43/04 , E21B47/00
摘要： A method for investigating a gravel pack located in the annulus between the tubing/screen and the casing of a borehole, comprising the steps of:moving a logging tool through the tubing/screen over the depth region of the gravel pack, said logging tool including a neutron source able to emit neutrons at such an energy that their interaction with a first set of atoms indicative of the gravel pack quality causes the production of gamma rays, and at least one gamma ray detector; andderiving a measurement of the number of gamma rays resulting from the interaction of said neutrons and said first set of atoms of the gravel pack material, and which are detected by said detector over a predetermined counting time interval.

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