CN101737032A - Gamma ray detector in carbon/oxygen spectral logging system with alpha particles - Google Patents
Gamma ray detector in carbon/oxygen spectral logging system with alpha particles Download PDFInfo
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- CN101737032A CN101737032A CN 201010000018 CN201010000018A CN101737032A CN 101737032 A CN101737032 A CN 101737032A CN 201010000018 CN201010000018 CN 201010000018 CN 201010000018 A CN201010000018 A CN 201010000018A CN 101737032 A CN101737032 A CN 101737032A
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Abstract
The invention relates to a gamma ray detector in a carbon/oxygen spectral logging system with alpha particles, which mainly solves the problem that larger signal interference exists between spectral signals and fast signals acquired by the traditional gamma ray detector in a carbon/oxygen instrument with alpha particles and causes the reduction of the logging accuracy. The gamma ray detector is characterized in that two photomultipliers are arranged in a main shell of a probe; after planes at the top and the bottom of a cylindrical scintillator are polished to form windows, the planes at the top and the bottom of the cylindrical scintillator are respectively connected with the photocathodes of the two photomultipliers; the photoanodes of the two photomultipliers respectively output spectral signals and fast signals independently; optical silicone oil is smeared at the corresponding joint of the scintillator with the scintillator to be used as an optical coupling agent; and after a fast gamma signal photomultiplier and a spectral gamma signal photomultiplier are closely connected with the cylindrical scintillator, corresponding signal wires and high-voltage power supply wires respectively pass through signal outlet holes at two ends. After the gamma ray detector is used, the interference factors generated in the signal multiplication process can be basically eliminated, thereby ensuring the logging accuracy.
Description
Technical field:
A kind of probe that is applied to when the present invention relates to follow α particle carbon-to-oxygen ratio spectrum logging on the oil field relates to a kind of gamma ray detector that is applied in the carbon/oxygen spectral logging system with alpha particles specifically.
Background technology:
Fast neutron and the atomic nucleus of 14MeV are done the time spent, and neutron is absorbed by atomic nucleus and forms complex nucleus, and neutron emits with lower energy then, and atomic nucleus is still stayed on the excitation state.Excited nucleus generally returns ground state by the emission gamma-rays again, and this mechanism is called inelastic scattering.Follow the carbon/oxygen log of α particle to be based on a kind of improved carbon/oxygen log system of fast neutron inelastic scattering theory.It comprises the neutron tube that has α particle signal deriving means, measure the gamma-ray gamma detector of direct inelastic scattering that neutron brought out, the linear electronics parts that link to each other with gamma ray detector, Fast Electronics timing part with α particle signal deriving means and the fast signal output coupling of gamma ray detector, be in the neutron shield body between neutron tube and the gamma detector, be the high pressure and the low-tension supply of neutron tube and electronics component power supply, and high pressure resistant sealing outer steel shell obtains with the ground data that links to each other with electronics component by cable, handle and control computer etc.Owing to contain a large amount of C, O, Si, Ca in the well cement sheath of cover back, the carbon-to-oxygen ratio value influence that these elements record common carbon-to-oxygen ratio spectrum logging is very big, uses and follows α particulate carbon oxygen just can well separate by no means formation factor to the influence of carbon-to-oxygen ratio value than power spectrum logging method.The reaction that accelerator for neutron production produces fast neutron is:
1H
3+
1d
2=
2He
4+
0n
1+ 17.6Mev, when alpha particle detector detects an alpha signal, illustrated that a fast neutron produces, this fast neutron produces inelastic scattering feature gamma-rays when bombarding stratum or well cement sheath through the flight of certain hour, and this feature gamma-rays has certain probability to be received by gamma ray detector.By with the Fast Electronics timing part of the fast signal output coupling of α particle signal deriving means and gamma ray detector, set certain time delay, make non-resilient gamma-rays that fast neutron and stratum element produce and be consistent, so just can remove the interference that various interfering materials cause measurement result in the well with its corresponding α particle signal.But when using above method, find, exist bigger signal between spectrum signal that the existing gamma ray detector of employing is obtained and the fast signal and disturb, cause logging accuracy to be lowered.Shown in Figure 2 being adopted the capture spectrum that obtains when having gamma ray detector now, i.e. energy and counting rate graph of a relation in example.Wherein abscissa is an energy, and ordinate is a counting rate, and by can obviously finding out among the figure, the hydrogen peak position is not obvious, shows the influence of energy calibration accuracy very big.
Summary of the invention:
Exist bigger signal interference in order to solve to adopt between spectrum signal that existing gamma ray detector obtained and the fast signal, the problem that causes logging accuracy to be lowered, the invention provides the gamma ray detector in a kind of new carbon/oxygen spectral logging system with alpha particles, after using this kind gamma ray detector, the disturbing factor that produces of erasure signal multiplicative process fundamentally, solve the problem of two kinds of signal phases mutual interference effectively, guaranteed logging accuracy.
Technical scheme of the present invention is: the gamma ray detector in this kind carbon/oxygen spectral logging system with alpha particles, have probe main shell and a cylindrical scintillator that has the scintillator sheath that is arranged in the probe main shell of spectrum signal and high-voltage signal access hole bottom being included in, most importantly, two photomultipliers are arranged in described probe main shell, be fast gamma signal photomultiplier and spectrum gamma signal photomultiplier, the photocathode that connects described two photomultipliers after the top and bottom plane polishing of described cylindrical scintillator is windowed is respectively smeared optics silicone oil as the optocoupler mixture in corresponding junction; The anode output spectra signal of described spectrum gamma signal photomultiplier connects linear electronics component, and the anode of described fast gamma signal photomultiplier is exported fast signal, connects the Fast Electronics timing part with α particle signal deriving means coupling.In addition, described gamma ray detector also comprises a fast gamma signal photomultiplier sealing-plug and a fast gamma signal photomultiplier can, have fast gamma signal and high-voltage signal access hole on the described fast gamma signal photomultiplier sealing-plug, and be threaded with fast gamma signal photomultiplier can employing, described fast gamma signal photomultiplier can also adopts with the probe main shell and is threaded, above-mentioned fast gamma signal photomultiplier and spectrum gamma signal photomultiplier be with after cylindrical scintillator closely is connected, and respective signal line and high-voltage power-line are then respectively by the signal fairlead discrepancy at two ends.
The present invention has following beneficial effect: after taking such scheme, because cylindrical scintillator both sides plane polishing is wherein windowed, connect two photomultipliers respectively, independently of one another received signal, output spectra signal and signal respectively soon then.Such two kinds of signals just were separated before amplifying, and had just fundamentally eliminated the disturbing factor that the signal multiplication process produces thus, had solved the problem of two kinds of signal phases mutual interference effectively, had guaranteed logging accuracy.The experiment proved that, utilize the present invention, record hydrogen in the capture spectrum, iron peak is obvious, this two peak of original system is not obvious by contrast, is unfavorable for scale.When score and non-bullet γ spectrum was captured in actual measurement, vertical resolution significantly strengthened, and carbon, oxygen peak are fairly obvious.
Description of drawings:
Fig. 1 is the structural representation of the novel gamma ray detector described in the present invention.
Fig. 2 is energy and the counting rate graph of a relation that obtains behind the existing gamma ray detector of mentioning among the present invention of application.
Fig. 3 uses energy and the counting rate graph of a relation that obtains behind the novel gamma ray detector described in the present invention.
Fast gamma signal of 1-and high-voltage signal access hole among the figure, the fast gamma signal of 2-photomultiplier base, the fast gamma signal of 3-photomultiplier sealing-plug, the fast gamma signal of 4-photomultiplier can, the fast gamma signal of 5-photomultiplier, the cylindrical scintillator of 6-, the 7-main shell of popping one's head in, 8-scintillator sheath, 9-spectrum gamma signal photomultiplier, the 10-analog to digital conversion circuit, 11-data upload circuit, 12-spectrum signal and high-voltage signal access hole.
The specific embodiment:
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, gamma ray detector in this kind of carbon/oxygen spectral logging system with alpha particles, have probe main shell 7 and a cylindrical scintillator 6 that has scintillator sheath 8 that is arranged in probe main shell 7 of spectrum signal and high-voltage signal access hole 12 bottom being included in, of paramount importancely be, two photomultipliers are arranged, promptly fast gamma signal photomultiplier 5 and spectrum gamma signal photomultiplier 9 in the described probe main shell 7.The photocathode that connects described two photomultipliers after the top and bottom plane polishing of described cylindrical scintillator 6 is windowed is respectively smeared optics silicone oil as the optocoupler mixture in corresponding junction; The anode output spectra signal of described spectrum gamma signal photomultiplier 9 connects linear electronics component, and the anode of described fast gamma signal photomultiplier 5 is exported fast signal, connects the Fast Electronics timing part with α particle signal deriving means coupling.In addition, described inelastic scattering gamma ray detector also comprises a fast gamma signal photomultiplier sealing-plug 3 and a fast gamma signal photomultiplier can 4, have fast gamma signal and high-voltage signal access hole 1 on the described fast gamma signal photomultiplier sealing-plug 3, and be threaded with fast gamma signal photomultiplier can 4 employings, described fast gamma signal photomultiplier can 4 also adopts with probe main shell 7 and is threaded, above-mentioned fast gamma signal photomultiplier 5 and spectrum gamma signal photomultiplier 9 be with after cylindrical scintillator 6 closely is connected, and respective signal line and high-voltage power-line are then respectively by the signal fairlead discrepancy at two ends.
The preferred embodiment of such scheme is, described cylindrical scintillator 6 is the cylindrical scintillator of bismuth germanium oxide, and described scintillator sheath 8 is an aluminium material, and fill with magnesium oxide powder in gap between the two.
In addition, for guaranteeing the tight contact between each parts, can be in probe main shell 7, compress a spring 11 between the base of spectrum gamma signal photomultiplier 9 and the inwall of probe main shell 7.
During concrete enforcement, fast gamma signal photomultiplier adopts the product of the loose company in Japanese shore, and model is the photomultiplier of R1288-01.The product that spectrum gamma signal photomultiplier can adopt the Beijing Nuclear Instrument Factory to produce, model is the photomultiplier of GDB51.The cylindrical scintillator of bismuth germanium oxide that adopts is called for short the cylindrical scintillator of BGO, is of a size of φ 50mm * 70mm, the polishing of bottom surface, cylinder both sides.Fast gamma signal photomultiplier sealing-plug, fast gamma photomultiplier can and probe main shell are the metal steel shell, and a side of fast gamma signal photomultiplier base, fast gamma signal photomultiplier and scintillator has constituted fast signal probe portion; The opposite side of spectrum gamma signal photomultiplier, spectrum gamma signal photomultiplier base and scintillator has then constituted the probe portion of spectrum signal.It is inner that the high pressure of two photomultipliers and ground wire are introduced probe from the access hole at two ends respectively, and fast gamma signal and spectrum signal are drawn from the access hole at two ends with coaxial line respectively.
Summing up design of the present invention basis is: only need get a signal mostly and get final product aspect radioactivity prospecting in the past, so all adopt from the mode of the anode number of winning the confidence basically.In large-scale Physical Experiment usefulness and radioactive logging instrument, sometimes a signal that needs to gather is used for two kinds of purposes, at this moment Chang Yong way is only with a photomultiplier, directly draws the logic analysis signal from some dynodes of photomultiplier, draws the analysis of spectrum signal from anode.And the associated particle instrument that the present invention describes adopted fast signal to take out from the fourth from the last dynode originally, and spectrum signal takes out from anode.But the experiment proved that owing to the high-precision requirement to the spectrum signal amplitude, the interference that two kinds of signals that make a traditional photomultiplier draw exist can not be ignored.The hydrogen peak that is used for scale when the inelastic scattering strength ratio is higher in the capture spectrum signal that obtains is fuzzy fully, and the hydrogen peak is generally as the standard that is used for energy calibration before the well logging.The associated particle instrument has just lost the advantage of high measurement accuracy like this.Adopt both sides to window after two photomultiplier measurements,, do not have interference, aspect electricity so high accuracy is with the obvious advantage because two kinds of signals are independent of each other.
Fig. 2 and Fig. 3 are respectively that window in both sides and the one-sided example of windowing obtains capture spectrum, i.e. energy and counting rate graph of a relation, and wherein abscissa is energy, and ordinate is a counting rate.By obviously finding out among the figure, the hydrogen peak position was not obvious when a side was windowed, and is very big to the influence of energy calibration accuracy.And after both sides window, hydrogen peak only not, in the well silicon to capture the peak also very clear.When obviously window respectively and to get spectrum signal and fast signal and be better than a side window aspect spectral resolution from two photomultiplier transit tube anodes in both sides from the dynode of photomultiplier and the resolution ratio of the anode number of winning the confidence simultaneously.
Claims (3)
1. the gamma ray detector in the carbon/oxygen spectral logging system with alpha particles, have probe main shell (7) and a cylindrical scintillator (6) that has scintillator sheath (8) that is arranged in probe main shell (7) of spectrum signal and high-voltage signal access hole (12) bottom being included in, it is characterized in that: two photomultipliers are arranged in the described probe main shell (7), be fast gamma signal photomultiplier (5) and spectrum gamma signal photomultiplier (9), the photocathode that connects described two photomultipliers after the top and bottom plane polishing of described cylindrical scintillator (6) is windowed is respectively smeared optics silicone oil as the optocoupler mixture in corresponding junction; The anode output spectra signal of described spectrum gamma signal photomultiplier (9) connects linear electronics component, and the anode of described fast gamma signal photomultiplier (5) is exported fast signal, connects the Fast Electronics timing part with α particle signal deriving means coupling; In addition, described gamma ray detector also comprises a fast gamma signal photomultiplier sealing-plug (3) and a fast gamma signal photomultiplier can (4), have fast gamma signal and high-voltage signal access hole (1) on the described fast gamma signal photomultiplier sealing-plug (3), and be threaded with fast gamma signal photomultiplier can (4) employing, described fast gamma signal photomultiplier can (4) also adopts with probe main shell (7) and is threaded, above-mentioned fast gamma signal photomultiplier (5) and spectrum gamma signal photomultiplier (9) be with after cylindrical scintillator (6) closely is connected, and respective signal line and high-voltage power-line are then respectively by the signal fairlead discrepancy at two ends.
2. the gamma ray detector in the carbon/oxygen spectral logging system with alpha particles according to claim 1, it is characterized in that: described cylindrical scintillator (6) is the cylindrical scintillator of bismuth germanium oxide, described scintillator sheath (8) is an aluminium material, and fill with magnesium oxide powder in gap between the two.
3. the gamma ray detector in the carbon/oxygen spectral logging system with alpha particles according to claim 1 and 2, it is characterized in that: in probe main shell (7), compress a spring (11) between the inwall of the base of spectrum gamma signal photomultiplier (9) and probe main shell (7).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360369A (en) * | 2014-11-13 | 2015-02-18 | 中国海洋石油总公司 | Method and device for measuring response function of detector |
| CN105628715A (en) * | 2015-12-31 | 2016-06-01 | 中国科学院青海盐湖研究所 | Potassium measuring instrument of sodium iodide crystals of raw material potassium ores |
| CN107315189A (en) * | 2017-07-21 | 2017-11-03 | 厦门中烁光电科技有限公司 | A kind of gamma ray probe and preparation method |
| CN109630091A (en) * | 2018-11-02 | 2019-04-16 | 中国石油天然气股份有限公司 | A kind of method of Optimized Numerical Simulation power spectrum in carbon/oxygen log |
| CN111119845A (en) * | 2019-12-31 | 2020-05-08 | 北京环鼎科技有限责任公司 | Three-probe logging instrument for 63 gamma energy spectrum and logging method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103558626B (en) * | 2013-11-14 | 2017-01-04 | 北京华脉世纪石油科技有限公司 | Gamma ray detector and gamma ray processing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021652A (en) * | 1990-01-11 | 1991-06-04 | Halliburton Logging Services, Inc. | Directional gamma ray spectrometer |
| CN1047237C (en) * | 1993-08-09 | 1999-12-08 | 清华大学 | Carbon/oxygen energy spectrum logging system |
| CN1297158A (en) * | 2000-12-22 | 2001-05-30 | 中国科学院高能物理研究所 | Combined gamma-ray detector |
| CN2591626Y (en) * | 2002-09-28 | 2003-12-10 | 大庆石油管理局 | Oxygen activation up-down water flow combined logging instrument |
| CN2737945Y (en) * | 2004-10-12 | 2005-11-02 | 郭清生 | Pulse neutron well logging instrument capable of synchronous making carbon-oxygen ratio and PNN well logging |
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2010
- 2010-01-04 CN CN 201010000018 patent/CN101737032B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360369A (en) * | 2014-11-13 | 2015-02-18 | 中国海洋石油总公司 | Method and device for measuring response function of detector |
| CN104360369B (en) * | 2014-11-13 | 2017-06-30 | 中国海洋石油总公司 | A kind of method and apparatus for measuring detector response function |
| CN105628715A (en) * | 2015-12-31 | 2016-06-01 | 中国科学院青海盐湖研究所 | Potassium measuring instrument of sodium iodide crystals of raw material potassium ores |
| CN107315189A (en) * | 2017-07-21 | 2017-11-03 | 厦门中烁光电科技有限公司 | A kind of gamma ray probe and preparation method |
| CN109630091A (en) * | 2018-11-02 | 2019-04-16 | 中国石油天然气股份有限公司 | A kind of method of Optimized Numerical Simulation power spectrum in carbon/oxygen log |
| CN109630091B (en) * | 2018-11-02 | 2021-12-03 | 中国石油天然气股份有限公司 | Method for optimizing numerical simulation energy spectrum in carbon-oxygen ratio logging |
| CN111119845A (en) * | 2019-12-31 | 2020-05-08 | 北京环鼎科技有限责任公司 | Three-probe logging instrument for 63 gamma energy spectrum and logging method thereof |
| CN111119845B (en) * | 2019-12-31 | 2023-10-27 | 北京环鼎科技有限责任公司 | 63 gamma-ray spectroscopy three-probe logging instrument and logging method thereof |
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Address after: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 263 South Central Avenue Patentee after: DAQING PETROLEUM ADMINISTRATION Co.,Ltd. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 263 South Central Avenue Patentee before: DA QING PETROLEUM ADMINISTRATION BUREAU |
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Effective date of registration: 20200803 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Co-patentee after: CHINA PETROLEUM LOGGING Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: 163453 Heilongjiang Province, Daqing City Ranghulu District No. 263 South Central Avenue Patentee before: DAQING PETROLEUM ADMINISTRATION Co.,Ltd. |
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