Method and apparatus for radioactive well logging employing partially overlapping time windows for detection of radiation
阅读：820发布：2021-03-21
专利汇可以提供Method and apparatus for radioactive well logging employing partially overlapping time windows for detection of radiation专利检索，专利查询，专利分析的服务。并且Methods and apparatus for radioactive well logging in which the formation is irradiated with bursts of primary radiation and the resulting secondary radiation is measured by employing partially overlapping detection windows. The invention may be employed in thermal neutron decay logging with the measurements obtained during the partially overlapping time windows employed to derive a decay parameter of the thermal neutron population developed in a formation as a result of bursts of fast neutrons. In addition radiation attendant to the thermal neutron population may be detected over a third time interval and employed to derive a background correction factor, and also to provide an indication of the porosity of the formation.，下面是Method and apparatus for radioactive well logging employing partially overlapping time windows for detection of radiation专利的具体信息内容。
1. In the logging of a well traversing a subterranean formation, the method comprising: a. irradiating the formation with a burst of fast neutrons whereby said fast neutrons enter said formation and are moderated therein to form a lower energy neutron population, and b. during each of first and second time intervals occurring subsequent to the initiation of said fast neutron burst selectively measuring radiation attendant to said lower energy neutron population, said second time interval beginning during said first time interval and subsequent to the start of said first time interval and terminating subsequent to termination of said first time interval whereby each of said first and second time intervals partially overlap the other.
2. The method of claim 1 wherein the durations of said first and second time intervals are substantially equal.
3. The method of claim 1 wherein the radiation detected comprises neutrons from said lower energy neutron population.
4. The meThod of claim 1 wherein said first and second intervals begin subsequent to the termination of said fast neutron burst.
5. In the logging of a well traversing a subterranean formation, the method comprising: a. irradiating the formation with a burst of fast neutrons whereby said fast neutrons enter said formation and are moderated therein to form a population of thermal neutrons, b. selectively measuring radiation attendant to said thermal neutron population during a first time interval which occurs subsequent to said fast neutron burst, c. selectively measuring radiation attendant to said thermal neutron population during a second time interval which begins during said first time interval and subsequent to the start of said first time interval and extends beyond the termination of said first time interval whereby each of said first and second time intervals partially overlap the other, and d. correlating a function representative of the measurements obtained during said first and second time intervals with depth.
6. The method of claim 5 wherein the durations of said first and second time windows are substantially equal.
7. The method of claim 5 wherein said second time interval begins at least one hundred microseconds after the beginning of said first time interval and extends beyond the termination of said first time interval by a period of at least one hundred microseconds.
8. The method of claim 5 further comprising: selectively measuring radiation attendant to said thermal neutron population during a third time interval, deriving a background correction factor from the measurement obtained during said third time interval, applying said factor to the measurements obtained during said first and second time intervals to provide a background correction in said measurements, and separately correlating a function representative of the measurement obtained during said third time interval with depth to provide an indication of the porosity of said formation.
9. The method of claim 5 wherein said radiation of said formation is accomplished by locating an emitter material characterized by the emission of alpha particles adjacent said formation and a target material characterized by the emission of fast neutrons in response to irradiation with alpha particles, and intermittently exposing said target material to alpha particles from said emitter material to produce bursts of fast neutrons.
10. In a well logging system, the combination comprising: a. a logging tool adapted for insertion into a borehole, b. a primary radiation source in said tool for emitting repetitive time-spaced bursts of primary radiation, c. a detection unit in said tool for detecting secondary radiation resulting from said primary radiation and producing output signals in response to said detected radiation, d. first and second measuring channels for producing first and second count rate functions representative of signals received from said detection unit, e. first and second gate means for applying during actuation thereof the output signals from said detection unit to said first and second measuring channels respectively, f. control means synchronized with said source for actuating said first gate means for repetitive first time intervals to apply the output from said detection unit to said first channel, and g. control means synchronized with said source for actuating said second gate means for repetitive second time intervals which begin during said first time intervals and subsequent to the start of said first time intervals and terminate subsequent to termination of said first time intervals whereby each of said first and second time intervals partially overlaps the other.
11. The system of claim 10 wherein said radiation source emits bursts of fast neutrons.
12. The system of claim 11 wherein said detection unit is responsive to radiation attendant to thermal neutrons.
13. The system of cLaim 12 further comprising: a third measuring channel responsive to the output from said detection unit for producing a third count rate function representative of signals received from said detection unit, means for deriving a background correction factor from said third count rate function, means for applying said factor to said first and second count rate functions to provide a background in said functions, and means for separately correlating said third count rate function with depth to provide a porosity log.
14. The system of claim 13 wherein said radiation source comprises emitter material characterized by the emission of alpha particles, target material characterized by the emission of fast neutrons in response to irradiation with alpha particles, and means for intermittently exposing said target material to alpha particles from said emitter material to produce bursts of fast neutrons.
15. The system of claim 14 wherein the output from said detection unit is applied continuously to said third measuring channel.
16. The system of claim 10 wherein said first and second gate means are actuated for substantially equal time intervals.
17. The method of claim 1 wherein said radiation of said formation is accomplished by locating an emitter material characterized by the emission of alpha particles adjacent said formation and a target material characterized by the emission of fast neutrons in response to irradiation with alpha particles, and intermittently exposing said target material to alpha particles from said emitter material to produce bursts of fast neutrons.
18. The system of claim 10 wherein said radiation source comprises emitter material characterized by the emission of alpha particles, target material characterized by the emission of fast neutrons in response to irradiation with alpha particles, and means for intermittently exposing said target material to alpha particles from said emitter material to produce bursts of fast neutrons.
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