CN86104825A - The well logger of band accelerator neutron generator - Google Patents
The well logger of band accelerator neutron generator Download PDFInfo
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- CN86104825A CN86104825A CN86104825.3A CN86104825A CN86104825A CN 86104825 A CN86104825 A CN 86104825A CN 86104825 A CN86104825 A CN 86104825A CN 86104825 A CN86104825 A CN 86104825A
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Abstract
In illustrative embodiment disclosed in this invention, a factor of porosity neutron logging instrument comprises: a D-T neutron accelerator; A fast-neutron monitor that is used for monitoring accelerator output; Nearly epithermal neutron detector and distance hyper-thermal neutron detector are born the measurement of main factor of porosity; Also have a little a long way off thermal neutron detectors, the wellhole thermal neutron absorption characteristic of stratal configuration on every side is provided.With respect to accelerator neutron generator, epithermal neutron is shielded and is separated, so that instrument obtains optimal response to formation porosity.Like this, this instrument provides accurate sensitivity in whole significant factor of porosity scope.
Description
The present invention relates to a kind of well logger, be used to study drilling well stratal configuration on every side, measure the feature of stratal configuration.Specifically, the present invention utilizes accelerator neutron generator, can accurately determine formation porosity and other characteristics, such as the macroscopic capture cross section.
To the drilling well understanding of the factor of porosity of stratal configuration on every side, very important in petroleum industry, be used to differentiate oily gentle Production Regional, calculate maximum oil-producing capacity index and other important parameters on stratum.The general known well logger that is used for measuring factor of porosity uses chemical neutron source, for example Cf
252, A
m-B
eOr P
u-B
eNeutron source, and putting plural neutron detector from source different distance place.Such well logger all has a detailed description in the United States Patent (USP) 3,566,117 of the M.Tixier that the United States Patent (USP) of the S.Locke that announces on Dec 9th, 1969 was announced on February 23rd, 3,483,376 and 1971.
Yet chemical neutron source exists serious problems such as processing, transportation and storage, and this has seriously hindered their use.Really, consider radiation safety and the reason that control is used to chemical source, just restriction more, and then may stop their use fully.In addition, chemical source has the limit of output intensity, is typically per second 4 * 10
7The magnitude of individual neutron or lower.Both made and to have designed the inside that is strapped in well logger, and used bigger chemical source more can increase the weight of radiation safety problem noted earlier.
Use is in well logger, various types of accelerator neutron generators all are suitable for, such as the accelerator neutron generator based on deuterium-tritium (D-T) reaction, it can produce the neutron of 14Mev, based on the accelerator neutron generator of (D-D) reaction, can produce the spectrum of a 1-10Mev, the neutron average energy is near 5Mev, the United States Patent (USP) 3,775 of the A.Frentrop that announces on November 27th, 1973, in 216, the example of a D-T accelerator neutron generator has been described.(this part application has transferred the assignee)
Because accelerator neutron generator can switch, by desirable logical and disconnected, the radiation problem that occurs when using chemical source in accelerator neutron generator, has just no longer existed.Another advantage of accelerator neutron generator is to improve neutron source strength.The sort of per second 5 * 10
8Individual neutron output or higher output obtain easily, and this is than the big order of magnitude of chemical source.Because the neutron output intensity is bigger, statistical accuracy can also be improved in the accelerator source, can also make that test operation carries out more hurry up.
In addition, higher neutron source strength has increased about shielding between the different detectors and configuration, and the dirigibility of configuration design between special detector and the neutron source.Therefore, can improve the performance of sniffer.For example, the spacing of big detector just can cause less boring influence.
Yet, have been found that in a known factor of porosity sniffer, directly replace chemical neutron source with accelerator neutron generator.A feasible well logger can not be provided.Its reason is the response of known factor of porosity proving installation, mainly by be transported near the detector high-energy neutron and by the degradation of energy collision, local slowing down is to more low-yield, the neutron that has taken place to survey at that time decides.By near detector, the total cross-section that detects neutron is different with energy, the source neutron energy can influence the response of factor of porosity, to a D-T source that can produce the 14Mev neutron, the ground layer cross section that neutron suffered from is very different with the situation of typical chemical source (is 4Mev as Am-Be source neutron average energy).Therefore, factor of porosity changes the influence to neutron detector, and the output signal of detector, all is different for D-T accelerator source and chemical source.Such as, directly replacing the distinct disadvantage of a chemical source with a D-T accelerator source is the insufficient sensitivity of factor of porosity, almost surpasses 25% factor of porosity.
Therefore, to using the porosimeter of accelerator neutron generator, the essential elimination and the relevant radiation problem of the chemical neutron source of use meanwhile, also will provide accurate factor of porosity sensitivity, reaches whole significant scopes in logging Application.Also will use a high-intensity accelerator neutron generator for the factor of porosity tester, this source can provide reasonable statistical accuracy, and test faster improves the dirigibility in the design, and can make preferably, is subjected to drilling well to influence the mensuration of less factor of porosity.
According to the present invention, above-mentioned and other requirements to prior art, can realize by a kind of well logger, this well logger comprises an accelerator neutron generator, a neutron monitor, a nearly epithermal neutron detector and a distance hyper-thermal neutron detector, for the special neutron shield of nearly epithermal neutron detector and distance hyper-thermal neutron detector, may also have a thermal neutron detector.
The purpose that the neutron source monitor is set is, its mainly neutron without slowing down to sending from the source, also is those neutron sensitivities of not having an effect with stratum or drilling well.Then, the neutron source monitor produces a signal that is proportional to the neutron source output intensity.
Nearly epithermal neutron detector is placed on and closes on the neutron source place.To the shielding of nearly epithermal neutron detector, preferably its low energy neutron is surveyed threshold values, bring up near 10ev, keep the sensitivity of higher neutron simultaneously.Best, around nearly epithermal neutron detector, form a ring with degraded neutron-intercept neutrons material.Such arrangement, in whole significant scopes (0%-40%), the sensitivity that has improved factor of porosity.Best, between neutron source and nearly epithermal neutron detector, do not place the high density shielding, can make nearly epithermal neutron detector, the source there is very close spacing.Close like this source-detector pitch helps to improve the sensitivity than factor of porosity.
Owing to improved the average detection energy of nearly epithermal neutron detector, just reduced sensitivity sharp to formation porosity.But be still sensitive for the effect of drilling well surrounding environment and instrument " far " effect.Therefore, when using when determining sensitivity than technology or crossplot technique, this tester can be used to proofread and correct the influence and instrument " far " effect of drilling well surrounding environment.Their each technology has detailed discussion in the back.
The position of distance hyper-thermal neutron detector will face toward neutron source, in order that this detector keeps enough sensitivities to formation porosity, and preferably more partially, adopt shielding, so that further improve its sensitivity, reduce sensitivity to the drilling well neutron to the stratum.
Thermal neutron detector is more farther from neutron source than distance hyper-thermal neutron detector from neutron source, but very near measures statistical accuracy so that improve.Thermal neutron detector preferably inclined to one side put and in one side conductively-closed towards drilling well so that reduce the influence of drilling well surrounding environment.Mensuration that thermal neutron detector just makes stratum characteristic is set in this well logger can depend on the absorption of thermal neutron, such as the capture cross-section ∑ on stratum, and still has good factor of porosity sensitivity and statistical degree of accuracy.
Although the accelerator neutron generator of other types also can be used, preferably use the D-T source.Suitable neutron detector is helium-3(
3He) proportional counter tube, rely on recently with two such detectors and neutron source, just near epithermal neutron detector and distance hyper-thermal neutron detector, they each wrap up with a thin cadmium layer that energy is lower than the neutron of about 0.5ev is insensitive so that they become.
The factor of porosity on stratum can be by the signal from nearly epithermal neutron detector, to ratio from the signal of distance hyper-thermal neutron detector, promptly use and determine than technology, or pass through by the normalized signal of neutron source supervisory signal from nearly epithermal neutron detector, with by the signal from distance hyper-thermal neutron detector of the signal normalization of neutron source monitor, the curve of comparing, promptly crossplot technique is determined.With any technology in the two, the mensuration of factor of porosity can be equivalent to, or is better than the mensuration that existing chemical source well logger is provided.Meanwhile, the safety that interrelates with the prior art well logger and the restriction of intensity have but been avoided.
Objects and advantages of the present invention from following detailed description to embodiment, follow accompanying drawing better to understand, wherein:
Fig. 1 is a well logger sectional view of the present invention;
Fig. 2 is the sectional drawing of well logger shown in Figure 1 along the 2-2 line, and illustrates thermal neutron detector and its shielding;
Fig. 3 is the sectional drawing of well logger shown in Figure 1 along the 3-3 line, illustrates distance hyper-thermal neutron detector and shielding thereof;
Fig. 4 is this well logger detector signal treatment circuit synoptic diagram;
Fig. 5 is the function curve of the comparison factor of porosity of closely superthermal-distance hyper-thermal neutron detector counting rate.
Fig. 6 is for various stratum parent rock distance hyper-thermal neutron detector counting rate, as the function X plot of nearly epithermal neutron Detector count rate.
One be based upon on the principle of the invention basis specific embodiment as shown in the figure, wherein, the identical same parts of reference numerals representation.Fig. 1 represents that one is used for studying the well logger of the factor of porosity of stratal configuration around the drilling well or pops one's head in 10.This device comprises 12, one neutron source monitors of an accelerator neutron generator, 16, one distance hyper-thermal neutron detectors 18 of 14, one nearly epithermal neutron detectors and a thermal neutron detector 20. Shielding 22,24 and 26 is used for respectively shielding surveys device 16,18 and 20, and shielding 28 places between nearly epithermal neutron detector 16 and the distance hyper-thermal neutron detector 18.
In a most preferred embodiment, neutron source monitor 14 comprises a scintillator 30, preferably plastics, certainly other types also can be used, it is used for the fast neutron that detection source is sent, and also has a photomultiplier 32 in addition, and it is used for amplifying the signal that scintillator 30 produces.This neutron source monitor is that application serial is the monitor of United States Patent (USP) disclosed that and structure and the size of No508623, and this United States Patent (USP) is be entitled as " the neutron source strength monitor of being applied for by P.Albats ".Suitable part is merged among the application in the Albats application.
Press the announcement of Albats, this monitor 14 can be made up of the long plastic scintillant (NE102A) of 0.5 inch, and its diameter is 0.5 inch.Neutron source monitor 14 should be placed to such an extent that it is preponderated to the response without the high-energy neutron of slowing down that comes from the source, and scattered neutron and gamma-ray influence then are reduced to minimum.Preferably this monitor 14 nestles up or just on the radius distance of accelerator neutron generator 12, makes scintillator 30 face toward target 34 positions of accelerator 12.But owing to the constraint (space constraint) of device, monitor may have to coaxially be settled with neutron source, such as in some collar aperture tube proving installation.Do not have between source 12 and the monitor 14 when heavily shielding, scintillator 30 may be placed in from source 30cm at a distance, just as in the Albats application more fully as described in.
Through suitably selected size and placement, neutron monitor is mainly in response to the neutron without slowing down, be those neutrons above neutron source is directly incident on it, thereby can measure the variation of source 12 output intensities reliably, and the influence that not changed by drilling well or formation characteristics.So as will be explained hereinafter, the output signal of neutron source monitor 14 can be used for the output signal of epithermal neutron detector 16,18 and thermal neutron detector 18 is carried out normalizing to the intensity fluctuation in source.Monitor 14 has good intrinsic gain stability, but just like in the Al-bats application and described in Fig. 4, if it is used in the high-voltage power supply FEEDBACK CONTROL circuit of monitor photomultiplier, the stability of gain is also bigger.
Represented nearly epithermal neutron detector 16 and distance hyper-thermal neutron detector 18 helium-3(preferably among Fig. 1
3He) proportional counter, it has the thin cadmium layer shielding of 0.02 inch (0.51cm) to be wrapped in, and this can make detector for having below the superheated region, and the neutron that also promptly is lower than about 0.5ev is insensitive.These detectors provide main porosity measurement.
The sensitive volume of nearly epithermal neutron detector or active zone are positioned at extremely close 12 places, source, and best (though this not necessarily) do not insert the high density screen layer.Such as, for a diameter is 1 inch (2.5cm), the so typical detector size of garden cylindricality detector of long 3 inch (7.6cm), the suitable interval between the target of the center of sensitive volume and a D-T accelerator should be 8 to 10 inch (20.3 to 25.4cm) magnitude.Approaching like this source-detector pitch is compared with the detector than long spacing that the shielding of inserting is arranged, and has improved than factor of porosity sensitivity.Therefore, be appreciated that best source-detector pitch can be along with some factors vary, i.e. detector size, pressure, source strength, accelerator type and similarly factor.
The shielding 22 that is used for nearly epithermal neutron detector 16 preferably annular and around the sensitive volume of nearly epithermal neutron detector.As described, shielding 22 is intended to the low energy neutron detection threshold is brought up near 10ev.Along with shielding 22 has such consideration, nearly epithermal neutron detector places the local of very close source again and does not insert the high density shielding therebetween, nearly epithermal neutron detector changes relatively say it is insensitive for the factor of porosity on stratum, because neutron energy that those and stratum react generally is the low energy neutron detection threshold that is lower than this detector.But, this nearly epithermal neutron detector still keeps sensitive for the influence of drilling well surrounding environment and instrument away from effect, because those neutron energies of having an effect with the thing in the drilling well generally surpass 10ev.Therefore, can compensate the signal of other detectors at the drilling well surrounding environment influence by the signal of nearly epithermal neutron detector output.The device and the art applications sequence number that are used for this purpose are No300, record to some extent in 418 the United States Patent (USP), and this part patent is to be applied for by people such as Ellis on September 9th, 1981, the existing patent No. is No4,423,323; In application serial is No405, also on the books in 391 the United States Patent (USP), and this part patent is to be applied for by Scott August 5 nineteen eighty-two, existing patent No. No4, and 524,274, their suitable parts in the inside are merged among the application.About profile, spacing and the effect of nearly detector 16 and shield 22 the further details of structure to be described in application serial be NO508, in 622 the United States Patent (USP) announcement is arranged, this application is that S.Antkiw applies for that to be entitled as " the neutron porosity pen recorder that uses the accelerator source " relevant portion of this application also is merged among the application.
For bigger stratum sensitivity, far detector 18 preferably is placed on a side of this probe 10, makes it towards the stratum by shielding, and as shown in Figure 3, the shielding 24 that is used for far detector is the garden cylindricality, and its inside has groove 36, and far detector 18 is placed in the groove.Shielding 24 makes the sensitive volume of far detector obtain shielding, prevents that just the neutron there on stratum incides above it dorsad from this probe towards drilling well over there.Erect image will recognize like that, this biasing of far detector and dorsad the result of screen layer reduce the sensitivity of far detector to the drilling well surrounding environment influence, improve its response to the variation of stratum porosity degree.
Spacing between source 12 and the far detector 18 is longer, just causes 18 pairs of source neutrons of detector relatively to say it is insensitive.Also can between nearly detector 16 and far detector 18, add an additional mask layer 28, so that further reduce the sensitivity of far detector to source neutron.
The sensitive volume of thermal neutron detector 20 is set at the source of leaving than the 18 farther places of leaving far detector, and it is so near in fact preferably putting from far detector, can make counting rate reach maximal value.As the epithermal neutron detector, the position of thermal neutron detector can be along with some factors vary, such as the size of workspace and the pressure of detector etc.The size of sensitive volume can adapt with the counting rate statistics that will reach, and is that 2.25 inch (5.7cm) length is 4 inch (10.2cm) such as diameter.Best, thermal neutron detector is offset in the groove as far detector 18, towards the stratum here.
As described in Fig. 2, shielding 26 makes the sensitive volume of thermal neutron detector obtain shielding, and the drilling well neutron of avoiding facing toward from probe over there incides above it, and this is the same situations with above-described shielding 24 shielding far detectors 18.Because the cause of this biasing and screen layer 26, thermal neutron detector is less to the remolding sensitivity of drilling well surrounding environment influence, to formation characteristics, as the variation of formation macro capture cross-section ∑ bigger sensitivity is arranged.Shielding 26 preferably one thin, as the cadmium layer shielding of 0.020 inch (0.51cm), it has the curved arch shape that is close to 180 ° of arcs, if but select for use other neutron absorbing material and other shape also to be fine.
Shielding 22,24 and 26 can be made with any suitable material or combined material, and they should have the performance of degraded neutron and intercept neutrons two aspects.For the slowing down fast neutron, just those seldom with the interactional neutron in stratum, need neutron moderator.In order to absorb thermal neutron, just those by slowing material or by thing in the drilling well or stratum thermalization neutron, need neutron-absorbing material.(application serial No508622) contrasts and comprehensively discusses in the Antkin application that the acting on of shielding material quoted from the front.Though not necessarily necessary, best three screen layers 22,24 and 28 use same shielding material.
A kind of suitable shielding material is exactly boron carbide (B
4C), its disperse is in epoxy resin or in other hydrogeneous constraint media, such as the B that 65% weight is arranged in epoxy resin
4C.For meeting the demands, as selected shielding material, screen layer 22,24 and 28 each all should be enough.Such as shielding 22, if use above-mentioned 65%B
4The C-epoxide resin material is made, and then its rough thickness should be 1 inch (2.5cm), finds that this is gratifying for the low energy neutron detection threshold is brought up near 10ev from 0.5ev.
Along with neutron source monitor 14 and neutron detector 16,18 and 20 have suitable spacing and shielding, just can improve determining to formation porosity.Just as previously described, because nearly detector 16 is relatively said smaller for the sensitivity that factor of porosity changes, bigger to drilling well surrounding environment influence and instrument away from effect sensitivity, the sensitivity that 18 pairs of factor of porosity of far detector change is relatively said also greatly, so can utilize draws to make with the friendship of far detector 18 counting rates than technology or nearly detector 16 factor of porosity is determined to improve, handing over draws is that the counting rate of each detector is come normalization with the ionization meter of neutron source monitor.With the exception of this, because the response to factor of porosity comes compared with the epithermal neutron detector, thermal neutron detector is relatively said not too sensitivity for drilling well size and instrument away from effect to the response of factor of porosity, so its output can be in order to derive the measurement of an additional factor of porosity.It can be the measurement of particular value that a kind of like this thermal neutron proosity is measured, and in the middle of this, the response of thermal neutron detector is not subjected to stratum and drilling environment that neutron is absorbed this material impact.Have, the output of thermal neutron detector makes that macroscopic capture cross section ∑ and other stratum entrapment properties can obtain with the measurement of epithermal neutron factor of porosity measuring together in same instrument again.
For this purpose, from
3He detector 16 and 18 output signal can be amplified and counting with any proper method, thereby derive for the counting rate (N) of nearly detector 16 with for the counting rate (F) of far detector 18.For example, picture as shown in Figure 4, can deliver to charge- sensitive preamplifier 35 and 37 from the detector signal of detector 16 and 18, give pulse amplifier 38 and 40 more therefrom, from each detector, the spectrum of the pulse that process is amplified is delivered to a forward position discriminator 42 and 44 again, and their output drives scaler 46 and 48.Scaler output is added on the signal processing circuit 50, this circuit can suitably digital machine, microprocessor or other data processing devices of programming be formed by one, can obtain the ratio N/F of nearly detector calibration device counting (N) from this circuit, as an indication of factor of porosity to far detector scaler counting (F).Find that this indication is subjected to the influence and the instrument of surrounding environment (mud, drilling well size etc.) but relatively smaller away from effect, it can provide a kind of accurate, reliable porosity measurement.Can be added on conventional record/drawing apparatus 52 than signal N/F, with its record as the function of the probe degree of depth and in addition.
Fig. 5 represent to get the long one section drilling well of 8 inch lime rock stratum is recorded factor of porosity be 0,13.2%, 29.3% and 40.6% o'clock near/more than the response of (N/F).Just as will be understood, in whole 0 to 41% factor of porosity scope, good sensitivity is arranged all than N/F.
If desired, can also utilize the X plot of nearly detector and far detector counting rate to determine factor of porosity.As understandable, crossplot technique can be used to revise surrounding environment influence.
Fig. 6 is near-(N-F) X plot far away of 0 to 41% factor of porosity in sandstone, ls and rauhkalk stratum, and it demonstrates the influence that geology changes.The data of painting are one 8 long not cased bore-boles of inch.
When crossplot technique being used for determine factor of porosity, N counting rate and F counting rate at first will be used the output normalization of neutron flux monitor 14.For this reason, each all removes counting rate (intensity) output signal (window A) of monitor 14 detector calibration device 46 and 48 output signal, as represented for provide output A/N and A/F from signal processing circuit 50 among Fig. 4.In this method, intensity output signal of sending from monitor 14 and involved circuit apply for that at aforesaid Albats the relevant portion of (application serial No508623) all has sufficient description, need not repetition here.The application of Albats has also been described and has been made monitor circuit obtain stable parts (unit 54 to 61 among Fig. 4), for this reason, has produced window B counting rate signal.
By normalized far detector counting rate F the factor of porosity sensitivity of height is arranged also, and can be used to derive the information of factor of porosity.But, it and N/F compare surrounding environment influence sensitive a little, but this sensitivity can be lowered by the accelerator of use higher-strength and bigger source-detector pitch.
The output signal of thermal neutron detector can be exaggerated, differentiates and calibrate (unit 62 to 68 among Fig. 4) equally, and a calibration output counting rate T about thermal neutron detector 20 is provided.This signal is preferably also used monitor output signal A normalization, and is used to derive the measurement of formation macro capture cross-section ∑.It can also be individually or with one or more normalization epithermal neutron Detector count rate signal A/N and A/F be used to derive factor of porosity information or differentiate the influence that neutron absorbs in porosity determination.Any part of these functions or all can in signal processing circuit 50, be achieved in any suitable manner and easily.
Although be to describe of the present inventionly with specific embodiment, be appreciated that it all is feasible improving and changing, and need not to change the inventive concept that is disclosed here.For example use helium-3 detector, boron fluoride (BF
5) detector or other type neutron detector replaces all can using.Also have, the source-detector pitch, the detector size that are different from here to be disclosed also can be used.All these improvements and changes can comprise in the claims.
Claims (15)
1, a kind of well logger that is used to study stratal configuration around the boring, its composition is:
--an accelerator neutron generator that constitutes by the D-T source of monoenergetic 14Mev neutron in fact,
--the neutron source monitoring arrangement, mainly to from said neutron source, be directly incident on its and go up neutron sensitivity without slowing down, be used for the output of surveillance source, the sensitive volume of said monitoring arrangement places the outside near neutron source,
--the first neutron detection device, be used for surveying epithermal neutron, this sniffer has one with the sensitive volume of some distance of neutron source and in fact it is insensitive for the neutron that energy is lower than about 0.5ev, the sensitive volume of said this sniffer nestles up neutron source, but there is not highdensity screen layer between them
--first shield assembly of energy degraded neutron and intercept neutrons, it is used for shielding the sensitive volume of the first neutron detection device, surveys threshold values with the low energy neutron that improves this device, makes to reach at least near 10ev
--be used for surveying the second neutron detection device of epithermal neutron, this device has a sensitive volume, this district is far away than the sensitive volume from the said first neutron detection device from accelerator neutron generator, and one side of deflection well, that the neutron that the said second neutron detection device is lower than about 0.5ev to energy is actually is insensitive,--have the secondary shielding device of degraded neutron and intercept neutrons performance, be used to shield the sensitive volume of the said second neutron detection device, shielding projects the neutron above it from away from well logger on one side.
2, as the said well logger of claim 1, wherein said first shield assembly, basically ringwise, be placed on the first neutron detection device around, constitute by a kind of hydrogenous material that can degraded neutron, the inside disperse has the material of intercept neutrons.
3, as the said well logger of claim 2, wherein the material of intercept neutrons is a boron carbide.
4, as the said well logger of claim 1, wherein said secondary shielding device can the degraded neutron hydrogenous material be made of a kind of, and disperse has the boron carbide of intercept neutrons in this material.
5, as the said well logger of claim 1, said first and the said second neutron detection device between the 3rd additional shield assembly is housed, it is made of a kind of hydrogenous material that can degraded neutron, disperse has the material of intercept neutrons in this material.
6, as the said well logger of claim 5, wherein the material of intercept neutrons is a boron carbide.
7, as the said well logger of claim 1, wherein said neutron source monitoring arrangement comprises an organic scintillator, constitutes said sensitive volume and a photomultiplier, said scintillator and said photomultiplier be optical coupled together.
8, as the said well logger of claim 7, wherein said scintillator is a plastic scintillant.
9, as the said well logger of claim 1, the wherein said first and second neutron detection devices, each is all by a thin cadmium cover of band
3The He proportional counter tube is formed.
10, as the said well logger of claim 1, it is subsidiary the signal display apparatus of the output signal ratio that is used for drawing said first pair second neutron detection device, as the indication of formation porosity.
11, as the said well logger of claim 1, it attaches and is used for drawing said neutron source monitoring arrangement, the first ratio signal display device to the ratio of the output signal of the said first neutron detection device, and be used for drawing said neutron source monitoring arrangement, to the said second neutron detection device, the second ratio signal display device of the ratio of output signal.
12, as the said well logger of claim 11, it attaches and is used for uniting said first and second than signal, shows with the signal that draws formation porosity.
13, a kind of well logger that is used to study stratal configuration around the boring, its composition is:
-one accelerator neutron generator that constitutes by the D-T source of monoenergetic 14Mev neutron in fact,
-neutron source monitoring arrangement, it mainly to directly from neutron source, project above it without the neutron sensitivity of slowing down, be used for the output of surveillance source, the sensitive volume of said neutron source monitoring device places the outside near neutron source.
-first
3The He proportional counter tube, it is placed on close neutron source but a distance is arranged, and does not insert highdensity screen layer therebetween, and it is insensitive that this pipe is lower than about 0.5ev neutron actual to energy.
-have first shield assembly of moderation of neutrons and absorptive character, be used for shielding said first
3The He proportional counter tube so that improve the threshold value that this pipe is surveyed low energy neutron, reaches near 10ev at least.
-the second
3The He proportional counter tube, it be placed on leave said neutron source ratio leave said first
3The He proportional counter tube is the place of some far, said second
3The He proportional counter tube, one side of deflection well logger, the neutron that energy is lower than 0.5ev is actually insensitive.
-have the secondary shielding device of moderation of neutrons and absorptive character, be used for shielding said second
3The He proportional counter tube is on one side shielding is from the neutron that scatters to away from well logger on the pipe
Three of-Di
3The He proportional counter tube, it is placed on leaves said neutron source ratio and leaves said second
3The He proportional counter tube is wanted place far away, and is partial to said well logger on one side, and uses the intercept neutrons material, in one side shielding away from well logger.
14, as the said well logger of claim 13, it attaches and is used for drawing said neutron source monitoring arrangement to said the 3rd
3First of the ratio of He proportional counter tube output signal than signal display apparatus and said neutron source monitoring arrangement to said second
3Second of the ratio of the output signal of He proportional counter tube is compared signal display apparatus.
15, as the said well logger of claim 14, it is subsidiary to be used for uniting said first and second than signal, shows with the signal of the macroscopic capture cross section that draws stratigraphic structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86104825 CN1015674B (en) | 1986-06-07 | 1986-06-07 | Well lagging tool with accelerator neutron source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86104825 CN1015674B (en) | 1986-06-07 | 1986-06-07 | Well lagging tool with accelerator neutron source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86104825A true CN86104825A (en) | 1987-12-16 |
| CN1015674B CN1015674B (en) | 1992-02-26 |
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ID=4802612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86104825 Expired CN1015674B (en) | 1986-06-07 | 1986-06-07 | Well lagging tool with accelerator neutron source |
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| CN101451433A (en) * | 2007-12-04 | 2009-06-10 | 普拉德研究及开发股份有限公司 | Hermetically sealed packaging and neutron shielding for scintillation-type radiation detectors |
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| JP4387927B2 (en) * | 2004-11-12 | 2009-12-24 | キヤノン株式会社 | Image forming apparatus |
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1986
- 1986-06-07 CN CN 86104825 patent/CN1015674B/en not_active Expired
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| CN100497885C (en) * | 2006-05-24 | 2009-06-10 | 中国石化集团胜利石油管理局钻井工艺研究院 | Deuterium-deuterium controllable compensating neutron well logging instrument during drilling |
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