CN2337315Y - Neutron tube with integral ring-shape alpha-detector for detecting well - Google Patents
Neutron tube with integral ring-shape alpha-detector for detecting well Download PDFInfo
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- CN2337315Y CN2337315Y CN98219005U CN98219005U CN2337315Y CN 2337315 Y CN2337315 Y CN 2337315Y CN 98219005 U CN98219005 U CN 98219005U CN 98219005 U CN98219005 U CN 98219005U CN 2337315 Y CN2337315 Y CN 2337315Y
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Abstract
The utility model belongs to the structural design field of a neutron generating device for detecting a well. The utility model comprises a sealing casing, an ion source, an assembled component for the extraction and focus of an ion beam, a gas storing device, an accelerating electrode and a target. The utility model is characterized in that the utility model also comprises an alpha particle collimator, a target chamber and an integral ring-shaped alpha detector; besides, the utility model is provided with a gas adsorbing device. The utility model can be matched with a carbon/oxygen specific energy spectrum instrument which is used for detecting a well and adopts the technology of the flight time of accompanying particles, and therefore, the adverse influence of gamma rays from the subjects of a sleeve pipe well and gamma rays captured by thermal neutrons is removed, and the precision of the detected carbon/oxidation is significantly improved.
Description
The utility model belongs to well logging and uses neutron generating means structure design field, particularly a kind of improvement that can be used in combination with " carbon/oxygen is than power spectrum logging instrument " that adopt the associated particle TOF technology with the sealing neutron tube structure that satisfies the well logging specific (special) requirements.
Nuclear carbon/oxygen than (C/O) logging instrument in, sealing neutron tube (following abbreviation neutron tube) is used to provide by nuclear reaction d+t → α+n the fast neutron of 14MeV.Existing common neutron tube generally is to be made of high-field electrode, capsul, Penning ion source, gas reservoir, accelerating electrode and target (tritium target or have target of one's own).With the neutron bombardment down-hole ore bed of 14MeV, the non-bullet that produces carbon and the oxygen gamma-rays (be respectively 4.43 and 6.13MeV) of inducting, by measuring this γ spectrum, under ideal conditions, the atomic carbon/oxygen that can obtain ore bed is oil saturation when.But, adopt the measured C/O of logging instrument (the common logging instrument of following abbreviation) of common neutron tube to have very big error, it mainly is to be caused by the cased well material that contains a large amount of C, O, Sl and Ca, and the gamma-rays that sends from the cased well material constitutes very big background to the non-bullet γ spectrum of survey.Thermal capture γ also constitutes background to non-bullet γ spectrum in addition.These backgrounds produce harmful effect to survey C/O value.Though common logging instrument is being updated, fail to address this problem always.
Announced a kind of " carbon/oxygen is than power spectrum logging instrument " (following abbreviation " novel logging instrument ") that adopts the associated particle TOF technology by the Chinese patent (application number 93109244.2) that the applicant proposes.This novel logging instrument is the neutron tube (following abbreviation " α-neutron tube ") by band alpha signal deriving means, fast timing electronics component, BaF
2γ-probe and other equipment commonly used in common logging instrument is formed.This novel logging instrument can finely overcome above-mentioned background on overall plan, can significantly improve the accuracy of the C/O ratio of surveying.
But above-mentioned patent does not have write up to the concrete structure of the critical component α-neutron tube of this novel logging instrument, does not relate to saidly following the specific design of alpha signal deriving means and associated little α-probe and making principle yet.
Another one Chinese patent (publication number CN2264332Y) discloses a kind of well logging neutron tube with α-scintillator, its structure is a α-scintillator to be welded on target head and one do not have between the common neutron tube of target head, α-scintillator is with one section glass tube, phosphorus ZnS spread upon make on its inner surface.But this patent does not mention that how assembling photomultiplier on disclosed α-scintillator removes to constitute a α-probe that reality is available.In fact, there is not needed space to remove to assemble suitable photomultiplier around this kind α-scintillator matrix.
Another Chinese patent (application number 98100264.1) that the applicant proposes discloses a kind of α-neutron tube structure, and it can be used the specific (special) requirements of satisfying well logging with above-mentioned novel logging instrument.Wherein the alpha signal deriving means is made up of around ion beam current a plurality of little α-detector rings, and little α-probe is made of glass light guides and the welding of Invar compo pipe.The weak point of this device is, structure is complicated, and manufacture craft is difficulty, and the neutron tube internal material is a lot, deposits and discharges a lot of foreign gases between the operating period at neutron tube easily, and shortened the application life of neutron tube.
In addition, all there is such problem in existing α-neutron tube, is depositing and between the operating period exactly, and inner high vacuum will be subjected to leaking gas and the harm of internal components venting inevitably, has therefore shortened its application life.
The purpose of this utility model is for overcoming the weak point of prior art, a kind of novel well logging neutron tube is provided, and wherein the alpha signal deriving means is a whole ring-like α-probe.It not only can be used the specific (special) requirements of satisfying well logging with above-mentioned novel logging instrument, can remove from the gamma-rays of cased well material and the adverse effect of thermal capture γ, significantly improves the accuracy of the C/O value of surveying; And have simple in structurely, and internal material is few, and manufacture craft is easier to, and particularly assembling photomultiplier has advantages such as flexibility.Further, it can also absorb from depositing and gas leakage between the operating period and inner venting, prolongs the application life of neutron tube.
The utility model proposes a kind of well logging neutron tube with whole ring-like α-probe, include the can of longitudinal center's axis, Penning ion source, ion beam current is drawn and the focus groups component, gas reservoir, accelerating electrode and target, wherein said Penning ion source, ion beam current is drawn and focus groups component and accelerating electrode are connected on the said can along said axis coaxle, and the memory that said memory is fixed in the said capsul is indoor; It is characterized in that also comprising the circular target chamber that said target is fixed on its bottom inner surface center, with the vertical coaxial ion beam current drift tube that is connected of said can and said target chamber, be between said ion beam current drift tube and the target by several photomultipliers and one and follow α particle scintillation detector with what integral ring-shaped α scintillator was formed, saidly be arranged on the rigidity transparent base that serves as the target chamber loam cake simultaneously, and be contained in α particle collimater in the target chamber with integral ring-shaped α scintillator.
Said rigidity transparent base can be the funnel-form cloche that an inner surface and external surface are similar to round platform lateral surface or terrace with edge lateral surface, the thin end of said funnel-form cloche and butt end vertically are soldered to respectively on a thin Invar compo pipe and the thick Invar compo pipe coaxially, the said thick compo pipe other end and said target chamber bottom are welded together and form target chamber, ion beam current drift tube external port is vertically welded together coaxially on the other end of said thin Invar compo pipe and the said capsul, and said photomultiplier fits together around said ion beam current drift tube and said rigidity transparent base.Wherein said photomultiplier can be realized optically-coupled by the external surface of special-shaped photoconduction and said rigidity transparent base; Also can realize optically-coupled by the external surface of skim transparent medium and said rigidity transparent base.Said photomultiplier can have the photocathode end face of a squint.
The utility model also can comprise the gas absorber that is fixed in the said capsul.Wherein said α particle collimater can be formed by the pore size sequential combination by the different thin round metal ring plate in several apertures.
The utility model is followed following principle design:
Promptly a complete α-probe comprises scintillator, photoconduction (if necessary), photomultiplier composite member.The performance that qualified α-probe should have in α-neutron tube comprises:
1. Man Yi geometrical property promptly has enough wide acceptance to follow the solid angle of α particle; Can exclude the cased well material from measuring the mining area; Determined optimum measurement mining area is in around the vicinity of γ-probe; Overall structure is applicable to the space that the down-hole is special.
2. Man Yi characteristics of signals, that is, output signal has sufficiently high amplitude and removes noise and other interference with anti-; Arranged to reduce uncertainty regularly the enough fast rise time; Satisfied neutron time of flight contour surface can be provided.
3. reliable manufacture craft feasibility, the α scintillator in α-neutron tube is a coating substances, it needs the rigidity transparent substance as matrix.Its manufacture craft is: the inorganic phosphor that about 9 μ of deposit are thick (such as, ZnS is ZnO) on selected matrix surface; Cover organic film Al film as thin as a wafer more successively, add the organic film of heat abstraction then, steam the thick Al film of about 1 μ of last layer is avoided scattering d in order to the protection phosphor bombardment at last.Scintillation phosphor and protection Al film are called for short α-scintillator.
This manufacture craft needs matrix that opening surface is arranged, such as the plane, and the inner surface of the annular solid of the sky that subtended angle is very big.If the matrix adopting glass tube then is difficult to produce qualified α scintillator.α-scintillator must have the solid angle of the reception α of enough big area and satisfaction.The photocathode area of photomultiplier should be as far as possible near the area of α-scintillator.In α-neutron tube, the counting rate that each photomultiplier bears can reach 2 * 10
5Cps to 3 * 10
5Cps.High like this counting rate requires photocathode to want enough big, and diameter is greater than 20mm approximately.Want to make the sufficiently high signal of photomultiplier output amplitude, photomultiplier will have abundant dynode, and this requires photomultiplier that suitable length will be arranged, such as greater than 50mm.According to the technology of above-mentioned requirements and existing making high temperatured photomultiplier, suitable available photomultiplier combination is greater than φ 24 * 60mm.
Referring to Fig. 1, the size and the position in optimum measurement mining area are depended on: target to γ scintillator center apart from S (usually S greater than 350mm), the external diameter W of cased well (about usually 200mm), the mining area thickness F that can detect.The geometrical property of α-probe depends on: outer diameter D, inner diameter d, scintillator height H, target diameter t
1, and α flicker dignity is to the average distance L of target center.
If the α scintillator has three how much degree of freedom (as D, d and H), by adjusting them and L obtains satisfied geometrical property easily.Resemble the lateral surface of a round platform such as its shape.If the α scintillator has only 2 or degree of freedom still less, then be difficult to obtain satisfied geometrical property.Such as it is a Circular glass pipe, in this case, when d and H all hour, can obtain the bigger α solid angle of accepting, but selected mining area is away from γ-probe.Square S gets 350mm when the source, when the cased well diameter is 200mm, expect satisfied geometrical property, then diameter d must be greater than 50mm, the high pressure resistant shell internal diameter of logging instrument is generally less than 90mm, does not therefore have enough big space assembling photomultiplier outside the tubular scintillator.
Owing to will assemble target chamber and the photomultiplier that holds α-probe, cause the similar value of α-neutron tube intermediate ion line delivered length in the common neutron tube, its structure and common neutron tube will have very big difference.
The utility model not only can be used the specific (special) requirements of satisfying well logging with above-mentioned novel logging instrument, can remove from the gamma-rays of cased well material and the adverse effect of thermal capture γ, significantly improves the accuracy of the C/O value of surveying; And have simple in structurely, and internal material is few, and manufacture craft is easier to, and particularly assembling photomultiplier has advantages such as flexibility.Further, it can also absorb from depositing and gas leakage between the operating period and inner venting, prolongs the application life of neutron tube.The scale of surveying can reach than difference with the C/O of oil well and well that (the carbon window is got 3.17～4.65MeV, and the oxygen window gets 4.68～6.43MeV) more than 0.35.
Brief Description Of Drawings
Fig. 1 is the schematic diagram of the utility model α scintillator and cased well geometric parameter.
Fig. 2 is the longitudinal sectional view of the α neutron tube structure of the utility model embodiment 1.
Fig. 3 is the α-neutron tube F-F place transverse sectional view among Fig. 2, shows that the α scintillator follow the alpha detection device is the schematic diagram of complete annular.
Fig. 4 is α-neutron tube target chamber part longitudinal sectional view of the utility model embodiment 2.
Two kinds of the utility model design with the well loggings of whole ring-like α-probe with neutron tube embodiment such as Fig. 2～shown in Figure 4.Be described in detail as follows respectively in conjunction with the accompanying drawings:
Embodiment 1, its structure as shown in Figure 2, seal gas extraction duct 1A, sealing insulator 1B, Invar compo pipe 1C seals horizontal lid 1D, glass or earthenware 1E, sealing insulator 1F, Invar compo pipe 1G seals horizontal lid 1H, ion beam current drift tube 6A, sealed being bonded together forms capsul 1, and its longitudinal center's axis will be longitudinal center's axis of whole neutron tube (being called for short axis later on).Magnet road composite member 3A, permanent-magnet steel ring 3B, 3F negative electrode 3C, 3E and anode 3D are combined together to form Penning ion source 3.Penning ion source 3 is assembled on the capsul 1 by connector 2 coaxial rigid, and anode 3D receives on the sealing insulator 1B center conductor by stub, and this stub passes and is fixed among the insulator 3G.
Between Penning ion source 3 and accelerating electrode 5 with sealed tube 1 coaxial device an ion draw and the focus groups component, this composite member is to be provided with in proper order along the axis of sealed tube by several planar lens to form.Present embodiment adopts three planar lens.The first planar lens 4A is served as by ion gun bottom with holes; The 3rd planar lens 4C is a magnetism-free stainless steel cap with holes, and it is fixed on the Penning ion source; The second planar lens 4B is a circular stainless steel substrates with holes, and it is clipped in the middle by two ceramic rings, and ceramic ring is coaxial fixing by the first and the 3rd planar lens.The second planar lens 4B links on another high-tension insulator center conductor by lead, and this lead passes and is fixed among the insulator 4H of location.The energy of ions of ion gun outgoing and direction are difficult to provide with analytical expression, can simulate them with the monte-carlo method.Target 12 and accelerating electrode 5 are in earth potential, the positive potential of 120KV is added on ion gun negative electrode and the 3rd planar lens 4C over the ground, the positive ionization potential of phase target 2000V is added on the anode 3D, the negative potential of the about 4000V of phase target is added on the second planar lens 4B, the about 10mm of the diameter of target 12, distance from the 3rd planar lens 4C to target 12 is about 200mm, use the beam optics program to adjust the aperture of each planar lens 4A, 4B, 4C and accelerating electrode 5 and mutual distance, can obtain the satisfied beam intensity and the rate that hits.
Stainless steel cover 7A, Invar metal-back 1C, the horizontal lid of lower seal 1G and ion beam current drift tube 6A have constituted the cavity of a ground connection, and gas reservoir 7B and gas absorber 8 are installed in it, with avoid charged particle bombardment they.The structure and the gas reservoir of gas absorber 8 are similar, and just fill deuterium tritium gaseous mixture to memory after, it thoroughly degass by high temperature.
Annular α-probe 9 shows 9A by a complete α scintillator 9B and matrix and several photomultipliers 9D forms.Scintillator matrix 9A is funnel shaped cloche, and its external surface and inner surface are similar to the lateral surface of a complete round platform lateral surface or a positive terrace with edge, and α scintillator 9B is produced on its inner surface, referring to Fig. 3.The thin end of glass basis 9A and thin Invar compo pipe 9C welding, its thick openend and thick Invar compo pipe 10A welding, the another port of 10A and bottom 10D welding form target chamber 10.With the external port coaxial welding of the ion beam current drift tube 6A on the thin Invar compo pipe 9C other end and the capsul 1, then form a α neutron tube before degassing.Abnormity photoconduction 9E is used to obtain the good optical coupling.The end of 9E and the photomultiplier of selecting for use coupling, the end face of the other end is the part of glass basis 9A external surface.The assembling photomultiplier is all having flexibility aspect quantity and the type, as long as it is just passable to change photoconduction 9E as required.
α collimater 11 in the target chamber is between target 12 and the α-combinations of detectors 9, it is formed by the pore size sequential combination by the different thin stainless steel circular ring plate in several apertures, endoporus forms the α particle passage of an approximate cone shape, give and decide solid angle, interior follows the α particle from target directive α-probe 9, but the α particle directive α-probe 9 that stops other to be scattered.
Adopt common process to carry out the component cleaning, degas, overall package, whole exhaust, memory is inflated and is sealed at last.The yield of this α-neutron tube is 10
7Magnitude satisfies the needs that use.Be used with " carbon/oxygen is than power spectrum logging instrument " that adopt the associated particle TOF technology, the scale of surveying can reach than difference with the C/O of oil well and well that (the carbon window is got 3.17～4.65MeV, and the oxygen window gets 4.68～6.43MeV) more than 0.35.
Embodiment 2
Its structure as shown in Figure 4, present embodiment is identical with embodiment 1 except a place.This place is that photomultiplier 9D directly is assembled on the external surface of glass basis 9A.Photomultiplier 9D has an oblique end face, can be by the direct optical match of external surface of several different methods and glass basis 9A, such as passing through transparent similar substances such as silicon rubber.
Claims (7)
1. well logging neutron tube with whole ring-like α-probe, include the can of longitudinal center's axis, Penning ion source, ion beam current is drawn and the focus groups component, gas reservoir, accelerating electrode and target, wherein said Penning ion source, ion beam current is drawn and focus groups component and accelerating electrode are connected on the said can along said axis coaxle, and the memory that said memory is fixed in the said capsul is indoor; It is characterized in that also comprising the circular target chamber that said target is fixed on its bottom inner surface center, with the vertical coaxial ion beam current drift tube that is connected of said can and said target chamber, be between said ion beam current drift tube and the target by several photomultipliers and one and follow α particle scintillation detector with what integral ring-shaped α scintillator was formed, saidly do on the rigidity transparent base that serves as the target chamber loam cake at the same time, and be contained in α particle collimater in the target chamber with integral ring-shaped α scintillator.
2. well logging neutron tube according to claim 1, wherein said rigidity transparent base is the funnel-form cloche that an inner surface and external surface are similar to round platform lateral surface or terrace with edge lateral surface, the thin end of said funnel-form cloche and butt end vertically are soldered to respectively on a thin Invar compo pipe and the thick Invar compo pipe coaxially, the said thick compo pipe other end and said target chamber bottom are welded together and form target chamber, ion beam current drift tube external port is vertically welded together coaxially on the other end of said thin Invar compo pipe and the said capsul 1, and said photomultiplier fits together around said ion beam current drift tube and said rigidity transparent base.
3. well logging neutron tube according to claim 2, wherein said photomultiplier is realized optically-coupled by the external surface of special-shaped photoconduction and said rigidity transparent base.
4. well logging neutron tube according to claim 2, wherein said photomultiplier is realized optically-coupled by the external surface of skim transparent medium and said rigidity transparent base.
5. neutron tube according to claim 4, wherein said photomultiplier has the photocathode end face of a squint.
6. well logging neutron tube according to claim 1 is characterized in that also comprising the gas absorber that is fixed in the said capsul 1.
7. according to claim 1 or the described well logging neutron tube of claim 6, wherein said α particle collimater is to be formed by the pore size sequential combination by the different thin round metal ring plate in several apertures.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98219005U CN2337315Y (en) | 1998-09-18 | 1998-09-18 | Neutron tube with integral ring-shape alpha-detector for detecting well |
| RU99100723/28A RU2199136C2 (en) | 1998-01-23 | 1999-01-14 | Neutron generator in sealed tube containing built-in detector of bound alpha particles for hole logging |
| US09/235,190 US6297507B1 (en) | 1998-01-23 | 1999-01-22 | Sealed tube neutron generator incorporating an internal associated-ALP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98219005U CN2337315Y (en) | 1998-09-18 | 1998-09-18 | Neutron tube with integral ring-shape alpha-detector for detecting well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2337315Y true CN2337315Y (en) | 1999-09-08 |
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ID=33971212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98219005U Expired - Fee Related CN2337315Y (en) | 1998-01-23 | 1998-09-18 | Neutron tube with integral ring-shape alpha-detector for detecting well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2337315Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033148A (en) * | 2013-12-09 | 2014-09-10 | 哈尔滨市源盛达电子技术有限公司 | Manufacture method of ceramic ring with insulated isolation groove for small-diameter neutron tubes |
| CN106098517A (en) * | 2016-07-29 | 2016-11-09 | 中国原子能科学研究院 | Miniature Penning ion source under a kind of highfield |
| CN108831582A (en) * | 2018-04-17 | 2018-11-16 | 东莞理工学院 | It is a kind of for improving the collimator of neutron purity |
-
1998
- 1998-09-18 CN CN98219005U patent/CN2337315Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033148A (en) * | 2013-12-09 | 2014-09-10 | 哈尔滨市源盛达电子技术有限公司 | Manufacture method of ceramic ring with insulated isolation groove for small-diameter neutron tubes |
| CN104033148B (en) * | 2013-12-09 | 2017-02-22 | 哈尔滨市源盛达电子技术有限公司 | Manufacture method of ceramic ring with insulated isolation groove for small-diameter neutron tubes |
| CN106098517A (en) * | 2016-07-29 | 2016-11-09 | 中国原子能科学研究院 | Miniature Penning ion source under a kind of highfield |
| CN108831582A (en) * | 2018-04-17 | 2018-11-16 | 东莞理工学院 | It is a kind of for improving the collimator of neutron purity |
| CN108831582B (en) * | 2018-04-17 | 2019-11-29 | 东莞理工学院 | It is a kind of for improving the collimator of neutron purity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |