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公开(公告)号：US3385969A
公开(公告)日：1968-05-28
申请号：US22280762
申请日：1962-09-11
发明人： NELLIGAN WILLIAM B
IPC分类号： G01V5/10
CPC分类号： G01V5/108
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公开(公告)号：US3603923A
公开(公告)日：1971-09-07
申请号：US3603923D
申请日：1968-09-10
发明人： NELLIGAN WILLIAM B
CPC分类号： E21B47/12
摘要： In one illustrative embodiment of the invention, an armored multiconductor cable connects an array of transformers and gate circuits in a borehole logging tool with a similar array at the earth''s surface. The downhole gates are enabled in a predetermined order to transmit sequential portions of a logging signal to the surface. A downhole logic circuit applies the successive signal portions to the cable conductors in a series of conductors potential combinations, or modes. The mode signals enable respective gates at the earth''s surface to produce a sequence of pulses that corresponds to the original signal.
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公开(公告)号：US3654467A
公开(公告)日：1972-04-04
申请号：US3654467D
申请日：1969-05-12
发明人： TITTMAN JAY , NELLIGAN WILLIAM B , WAHL JOHN S , SHERMAN HAROLD
CPC分类号： G01V5/101
摘要： A typical embodiment of the invention enables neutrons of low average energy that characteristically are emitted from californium 252 (Cf252) to react with, or fail to react with, nuclei within an earth formation, depending on the energy threshold for the reaction in question. The neutron activation induced by means of the Cf252 source is compared with the response induced in the formation through neutrons of higher average energies from other sources, The activation comparison permits the identification of elements and minerals in the formation to be determined accurately.
摘要翻译： 根据本发明的反应的能量阈值，本发明的典型实施例使得能够从ium 252（Cf252）发射的低平均能量的中子与地球内的核反应或不与其反应。 通过Cf252源引起的中子活化与通过来自其他来源的较高平均能量的中子在地层中诱导的响应进行比较。活化比较可以准确地确定地层中的元素和矿物质的鉴定。
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4.发明授权Method and apparatus for automatic correction of measured thermal neutron decay time 失效用于自动校正测量的热中性衰减时间的方法和装置
公开(公告)号：US3859524A
公开(公告)日：1975-01-07
申请号：US25746272
申请日：1972-05-26
发明人： NELLIGAN WILLIAM B
CPC分类号： G01V5/102
摘要： An illustrative embodiment of the invention discloses a technique for converting pulse neutron measurements of certain parameters relating to properties of strata adjacent to a well bore into more accurate indications of those properties. More particularly, thermal neutron decay time measurements, which are usually indicative of the chemical compositon of formation fluids, have been subject to hitherto unrecognized sources of error. These measurement conversions are accomplished through the application of predetermined factors derived from parameters that introduced the errors into the measurements. Typically, a compensation is made for the borehold or casing pipe diameter and the salinity of the fluid in the borehole to establish a more accurate indication of the neutron properties of adjacent formations.
摘要翻译： 本发明的说明性实施例公开了一种用于将与井眼相邻的层的属性相关的某些参数的脉冲中子测量转换成更精确的这些特性的指示的技术。 更具体地，通常表示地层流体的化学组成的热中子衰变时间测量已经经历迄今未被认识的误差源。 这些测量转换通过应用从将误差引入到测量中的参数导出的预定因子来实现。 通常，对钻孔或套管直径和钻孔中流体的盐度进行补偿，以建立相邻地层的中子特性的更准确的指示。
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5.发明授权Method and apparatus for measuring neutron characteristics of a material surrounding a well bore 失效用于测量环境的材料的中子特性的方法和装置
公开(公告)号：US3566116A
公开(公告)日：1971-02-23
申请号：US3566116D
申请日：1966-11-08
发明人： NELLIGAN WILLIAM B
CPC分类号： G01V5/102
摘要： In the particular embodiments of the invention described herein, the formation surrounding a well bore is irradiated with a burst of neutrons and the neutron concentration is observed during selected time intervals after irradiation to determine the thermal neutron decay time characterizing the formation. In one embodiment, the neutron concentration is observed during a first interval one decay time long and during a second and subsequent interval two decay times long which starts immediately after the first interval. In another embodiment the two intervals are spaced by one decay time.
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