System for measuring earth formation thermal neutron lifetime utilizing a harmonically intensity modulated fast neutron source
阅读：698发布：2021-05-20
专利汇可以提供System for measuring earth formation thermal neutron lifetime utilizing a harmonically intensity modulated fast neutron source专利检索，专利查询，专利分析的服务。并且A system is disclosed for measuring indications of the thermal neutron lifetime of earth materials in the vicinity of a well borehole. A harmonically intensity modulated source of fast neutrons is used to irradiate the earth formations in the vicinity of a borehole with fast neutrons at three different intensity modulation frequencies. Intensity modulated clouds of thermal neutrons at each of the three modulation frequencies are detected by a single spaced detector. The tangent of phase shift of the thermal neutron intensity with respect to the fast neutron population intensity is measured at each of the three frequencies. These measurements may be appropriately combined to derive the thermal neutron lifetime of earth materials in the vicinity of the borehole.，下面是System for measuring earth formation thermal neutron lifetime utilizing a harmonically intensity modulated fast neutron source专利的具体信息内容。
1. Apparatus for logging earth formations traversed by a fluid filled well borehole to develop a measurement of thermal neutron interaction characteristics of such formations, comprising: a well logging sonde sized and adapted for passage through a well borehole and having therein; means for continuously generating a population of fast neutrons for bombarding the media surrounding a well borehole to develop a thermal neutron population in the borehole and surrounding media; means for harmonically modulating the intensity of fast neutrons at, at least three different modulation frequencies; means for detecting the thermal neutron population in the vicinity of said sonde as a function of time and for developing signals representative thereof; and means for combining said representative signals according to predetermined relationships to derive an indication of the thermal neutron decay time of the earth formations in the vicinity of the borehole.
2. The apparatus for claim 1 and further including means for combining said representative signals according to predetermined relationships to simultaneously derive an indication of the thermal neutron decay time of the borehole fluid.
3. The apparatus of claim 2 and further including means for recording said indications of the thermal neutron decay time characteristics of the earth formations and the borehole fluid as a function of the borehole depth of said sonde.
4. The apparatus of claim 1 wherein said means for detecting the thermal neutron population as a function of time includes means for detecting said thermal neutron population during quadrant intervals of a cycle of modulation at each of said at least three different intensity modulation frequencies and means for generating signals representative thereof.
5. The apparatus of claim 4 and further including means for combining said representative quadrant signals in a predetermined manner to derive indications of the relative phase shift between the intensity of the fast neutrons And the thermal neutron population at each of said different frequencies of intensity modulation.
6. The apparatus of claim 5 and wherein said combining means includes means for combining said representative quadrant signals to derive an indication of the tangent values of said relative phase shift angles at each of said different frequencies of intensity modulation.
7. The apparatus of claim 1 wherein said means for harmonically modulating the intensity of said fast neutrons includes means for harmonically modulating the intensity of said fast neutrons at a first frequency for a first time interval, means for harmonically modulating the intensity of said fast neutrons at a second frequency for a second time interval immediately succeeding said first time interval, means for harmonically modulating the intensity of said fast neutrons at a third frequency for a third time interval immediately succeeding said second time interval and means for repetitively repeating this time sequence of modulation at said three frequencies as said sonde is moved through a well borehole.
8. The apparatus of claim 7 wherein said first, second, and third time intervals are of equal duration.
9. The apparatus of claim 7 and further including means for detecting the thermal neutron population for quadrant cycle intervals of said first modulation frequency during said first time interval, means for detecting the thermal neutron population for quadrant cycle intervals of said second modulation frequency during said second time interval and means for detecting the thermal neutron population for quadrant cycle intervals of said third frequency during said third time interval.
10. The apparatus of claim 9 wherein said first, second and third time intervals are of equal duration.
11. The apparatus of claim 10 wherein said modulation frequencies are chosen to be 400 Hertz, 2000 Hertz and 4000 Hertz respectively.
12. The apparatus of claim 9 and further including means for delaying, for a predetermined time duration, at the beginning of each of said first, second and third time intervals, the detection of the thermal neutron population to allow any phase shift effects present in such population from the prior modulation frequency interval to substantially die away and for then resuming said detection for the remainder of said time interval.
13. The apparatus of claim 12 wherein said delaying means comprises means for delaying said thermal neutron population detection for an integral number of modulation cycles at each of said different modulation frequencies.
14. The apparatus of claim 9 and further including means for generating clock synchronization signals for establishing a time reference with respect to which said modulation intervals and said detection intervals are defined.
15. The apparatus of claim 14 and further including means for amplifying said representative detection signals during each of said first, second and third time intervals by different amounts to assist in distinguishing said signals from each other.
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