CN118068435A - Pulse neutron tube for logging and logging while drilling instrument - Google Patents
Pulse neutron tube for logging and logging while drilling instrument Download PDFInfo
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- CN118068435A CN118068435A CN202410194029.1A CN202410194029A CN118068435A CN 118068435 A CN118068435 A CN 118068435A CN 202410194029 A CN202410194029 A CN 202410194029A CN 118068435 A CN118068435 A CN 118068435A
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- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 150000002500 ions Chemical class 0.000 claims abstract description 135
- 229910052722 tritium Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 40
- 239000004020 conductor Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims 2
- 238000010884 ion-beam technique Methods 0.000 abstract description 16
- 238000000605 extraction Methods 0.000 abstract description 4
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910052805 deuterium Inorganic materials 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000271510 Agkistrodon contortrix Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a pulse neutron tube for well logging and a logging while drilling instrument, wherein the pulse neutron tube for well logging comprises an ion source, a nonmetallic shell, an accelerating electrode, a target body and a grid, the grid is arranged between the ion source and the accelerating electrode, and the control mode of the grid is as follows: applying a pulse negative voltage to the grid electrode to lead out deuterium-tritium mixed ions generated by gas discharge at the ion source, and switching the pulse negative voltage applied to the grid electrode to a positive voltage after the neutron beam is excited so as to realize the cut-off of the neutron beam; the grid electrode and the ion source and the accelerating electrode are all arranged in an insulating way. According to the invention, the grid electrode is arranged between the ion source shielding cover and the accelerating electrode, and the pulse extraction voltage is added to the grid electrode and used for extracting the pulse ion beam of the ion source; and the resulting neutron pulse has sharp edges and a high repetition frequency.
Description
Technical Field
The invention belongs to the technical field of logging while drilling, and particularly relates to a pulse neutron tube for logging and a logging while drilling instrument.
Background
The prior commercially applied controllable neutron source logging neutron tube mostly adopts a cold cathode technology, and the prior cold cathode neutron Guan Duowei penning ion source for nuclear logging is adopted; the neutron tube can be divided into a prefabricated target body and a self-forming target body neutron tube according to different target bodies, and the self-forming target body neutron tube has the characteristics of long service life, stable yield and the like, and becomes a hot spot for developing technical research at the current stage at home and abroad. The thermal cathode self-targeting neutron tube has a steep pulse edge compared with a cold cathode neutron tube, can generate neutron pulses with high repetition frequency, and can better separate inelastic scattering from capture gamma energy spectrum in nuclear logging application based on the characteristics, so that stratum information can be reflected more truly, and more effective logging data can be provided.
Because the thermal cathode neutron tube has poorer yield stability and service life than the cold cathode neutron tube, the cold cathode neutron tube is still commonly used in the logging process at present. However, the inherent ignition mechanism of penning ion sources for cold cathode neutron tubes causes the resulting pulse fronts to have fluctuations.
Disclosure of Invention
In order to solve all or part of the problems described above, an object of the present invention is to provide a pulse neutron tube for logging and a logging while drilling tool, in which the edge of a neutron pulse obtained by the pulse neutron tube of the present invention is steep and the repetition frequency is high.
According to one aspect of the invention, there is provided a pulse neutron tube for logging, comprising an ion source, a nonmetallic housing, an accelerating electrode, a target body, and a grid electrode, wherein the grid electrode is arranged between the ion source and the accelerating electrode, and the control mode of the grid electrode is as follows: applying a pulse negative voltage to the grid electrode to lead out deuterium-tritium mixed ions generated by gas discharge at the ion source, and switching the pulse negative voltage applied to the grid electrode to a positive voltage after the neutron beam is excited so as to realize the cut-off of the neutron beam; the grid electrode and the ion source are arranged in an insulating mode, and the grid electrode and the accelerating electrode are arranged in an insulating mode.
Further, the ion source comprises an ion source shielding cover, the upper end of the ion source shielding cover is fixedly connected with a metal head, the metal head is located in the ion source shielding cover, an ion source anode cylinder is arranged in an annular space between the metal head and the ion source shielding cover, the ion source anode cylinder is connected with a wire, the wire stretches out of the ion source, a first permanent magnet is fixedly connected to the metal head, and the ion source anode cylinder is fixed to the metal head or the ion source shielding cover through a first insulating ring.
Further, the ion source device further comprises a gas pressure adjusting element, one end of the gas pressure adjusting element extends out of the ion source, and the other end of the gas pressure adjusting element is connected with the ion source shielding cover or the metal head.
Further, the ion source shielding cover further comprises a second insulating ring, wherein the second insulating ring is fixedly connected to the lower end of the ion source shielding cover, and the grid is fixed between the second insulating ring and the nonmetallic shell.
Further, the second insulating ring is fixedly connected with an inner insulating ring, the inner insulating ring extends to be blocked between the ion source anode cylinder and the grid, and the lower end of the ion source anode cylinder is lapped on the inner insulating ring.
Further, the first insulating ring and the second insulating ring are ceramic insulating rings, and the nonmetallic shell is a ceramic shell.
Further, the target body is plated with a getter material for adsorbing deuterium-tritium mixed gas, the target body is fixed at one end of the nonmetallic housing far away from the ion source, and the accelerating electrode is fixed on the target body.
Further, a first mounting groove is formed in the target body, a metal conductor is fixedly arranged in the first mounting groove, and the accelerating electrode is fixed on the metal conductor.
Further, a second mounting groove is formed in the target body, and a second permanent magnet is fixedly arranged in the second mounting groove.
According to another aspect of the present invention, there is provided a logging while drilling tool having provided thereon a pulsed neutron tube for logging as defined in any one of the preceding claims.
According to the technical scheme, the pulse neutron tube for logging and the logging while drilling instrument provided by the invention have the following beneficial effects:
according to the invention, the grid electrode is arranged between the ion source shielding cover and the accelerating electrode, the pulse extraction voltage is added to the grid electrode, so that a pulse ion beam is generated, and the pulse ion beam is accelerated by the accelerating electrode to finally generate a pulse neutron beam, so that the fast pulse characteristic of the neutron tube can be realized; the edges of the obtained neutron pulse are steep, and the repetition frequency is high; meanwhile, the embodiment has the characteristics of good yield stability, long service life and the like;
the voltage on the grid electrode is rapidly switched from negative voltage to positive voltage, so that the neutron beam is rapidly cut off;
The ion source anode cylinder is fixed on the ion source copper head through the first insulating ring in a welding way, so that the vibration resistance and the shock resistance of the neutron tube are improved.
Drawings
FIG. 1 is a cross-sectional view of a pulsed neutron tube for well logging according to an embodiment of the present invention;
The reference numerals in the drawings are: the ion source comprises an ion source 1, a metal head 11, an ion source shielding cover 12, a first insulating ring 13, an ion source anode cylinder 14, a second insulating ring 2, an inner insulating ring 21, an accelerating electrode 3, a grid electrode 4, a first permanent magnet 5, a gas pressure regulating element 6, a nonmetallic shell 7, a target body 8, a second permanent magnet 9 and a metal conductor 10.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the pulse neutron tube for logging and logging while drilling instrument of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the pulse neutron tube for logging according to the embodiment of the invention includes an ion source 1, a nonmetallic housing 7, an accelerating electrode 3, a target 8, and a grid 4, wherein the grid 4 is disposed between the ion source 1 and the accelerating electrode 3, and the control mode of the grid 4 is as follows: applying a pulse negative voltage to the grid electrode 4 to lead out deuterium-tritium mixed ions generated by gas discharge at the ion source 1, and switching the pulse negative voltage applied to the grid electrode 4 to a positive voltage after the neutron beam is excited so as to realize the cut-off of the neutron beam; the grid electrode 4 and the ion source 1 and the grid electrode 4 and the accelerating electrode 3 are all arranged in an insulating way.
The present examples are directed to a self-targeted cold cathode penning ion source. The present embodiment provides a grid 4 between the ion source 1 and the accelerating electrode 3, the grid 4 of the present embodiment may also be referred to as an extraction electrode. Specifically, the ion source 1 is discharged to generate deuterium-tritium mixed ions, the deuterium-tritium mixed ions are led out through the grid electrode 4 added with negative pulse voltage to form pulse deuterium-tritium mixed ion beams, the pulse deuterium-tritium mixed ion beams are accelerated by the accelerating voltage and then hit on the target body 8, nuclear reaction is carried out on the pulse deuterium-tritium mixed ion beams and the deuterium-tritium mixed gas absorbed in the target body 8, and 14Mev single-energy pulse neutron beams are emitted.
In this embodiment, the ion source 1 working in the dc state generates a pulsed ion beam by the negative pulse voltage of the grid electrode 4, and finally obtains a pulsed neutron beam, which avoids the fluctuation of the pulse front edge caused by the inherent ignition mechanism of the cold cathode penning ion source, and achieves the purpose of optimizing the pulse characteristics of the neutron tube. The embodiment can realize the fast pulse characteristic of the neutron tube and high repetition frequency.
In this embodiment, the control mode after the gate electrode 4 is set is different from the original control mode of the cold cathode penning ion source, and the original cold cathode penning ion source realizes neutron pulse excitation by applying positive high-voltage pulse. The control manner after the gate 4 is set in this embodiment is: firstly, anode ignition voltage with a certain value is applied to an ion source 1, usually about 2000V, and the ion source 1 generates deuterium-tritium mixed ions through gas discharge; then, according to actual needs, pulse negative voltage with proper pulse width, frequency and amplitude is added on the grid electrode 4, and the pulse ion beam is led out from the ion source 1; thirdly, adding 60-120 kilovolts of negative high voltage on the accelerating electrode 3, and bombarding the target body 8 after the pulse ion beam is accelerated by the negative high voltage, so as to generate nuclear reaction with deuterium-tritium mixed gas adsorbed in the target body 8, thereby generating 14Mev single-energy pulse neutron beam; and finally, after the neutron beam is excited, the voltage on the grid electrode 4 is rapidly switched from negative voltage to positive voltage, so that the neutron beam is rapidly cut off.
The embodiment of the invention can realize the rapid pulse characteristic on the basis of the technology of the cold cathode penning ion source, the edge of the obtained neutron pulse is steep and the repetition frequency is high, and meanwhile, the embodiment has the characteristics of good yield stability, long service life and the like; the embodiment can realize the purpose of replacing foreign hot cathode neutron tube technology.
In an embodiment, the ion source 1 comprises an ion source shielding cover 12, a metal head 11 is fixedly connected to the upper end of the ion source shielding cover 12, the metal head 11 is located in the ion source shielding cover 12, an ion source anode cylinder 14 is arranged in an annular space between the metal head 11 and the ion source shielding cover 12, the ion source anode cylinder 14 is connected with a wire, the wire stretches out of the ion source 1, a first permanent magnet 5 is fixedly connected to the metal head 11, and the ion source anode cylinder 14 is fixed to the metal head 11 or the ion source shielding cover 12 through a first insulating ring 13.
Specifically, the ion source 1 of the present embodiment includes an ion source shield 12, a metal head 11, and an ion source anode cylinder 14; the upper end of the ion source shielding cover 12 is fixedly connected with the metal head 11, and an annulus is formed between the ion source shielding cover 12 and the metal head 11 after the ion source shielding cover 12 is fixedly connected with the metal head 11, and extends downwards to penetrate through the lower end of the metal head 11.
The ion source anode cartridge 14 is disposed in an annulus between the metal head 11 and the ion source shield 12, and a wire connected to the ion source anode cartridge 14 for applying an anode ignition voltage to the ion source 1 is extended to the outside of the ion source 1, and no contact is made between the ion source anode cartridge 14 and the metal head 11, and between the ion source anode cartridge 14 and the ion source shield 12.
In the embodiment, the ion source anode cylinder 14 is fixed on the metal head 11 or the ion source shielding cover 12 through the first insulating ring 13, so that the vibration resistance and impact resistance of the neutron tube are improved, and the requirement of high impact vibration when the neutron tube is used for logging while drilling can be met.
Finally, the metal head 11 is fixedly connected with the first permanent magnet 5, for example, the first permanent magnet 5 is fixedly connected with the metal head 11 through magnetic attraction; or as shown in fig. 1, the metal head 11 is provided with a mounting hole for mounting the first permanent magnet 5, and the first permanent magnet 5 is arranged in the mounting hole; the first permanent magnet 5 of this embodiment is arranged to provide an axial magnetic field for the discharge chamber of the ion source 1.
In one embodiment, the ion source further comprises a gas pressure adjusting element 6, one end of the gas pressure adjusting element 6 extends out of the ion source 1, and the other end of the gas pressure adjusting element 6 is connected with an ion source shielding cover 12 or a metal head 11.
The air pressure adjusting element 6 of the present embodiment is used for adjusting the air pressure of the discharge chamber of the ion source 1 to realize self-sustaining discharge. One end of the air pressure adjusting element 6 extends out of the ion source 1, so that voltage can be conveniently applied to the air pressure adjusting element 6 through the end, and the other end of the air pressure adjusting element 6 is connected with the ion source shielding cover 12 or the metal head 11.
Thirdly, the specific process of obtaining the neutron beam by utilizing the neutron tube is as follows: after the neutron tube is qualified in experiment, deuterium-tritium mixed gas is discharged into the neutron tube by adjusting the power supply voltage and current of the air pressure adjusting element 6, so that the air pressure in the neutron tube reaches a required level, and then a certain value of anode ignition voltage is added to the ion source 1.
In one embodiment, the ion source shielding device further comprises a second insulating ring 2, wherein the second insulating ring 2 is fixedly connected to the lower end of the ion source shielding cover 12, and the grid electrode 4 is fixed between the second insulating ring 2 and the nonmetallic housing 7.
Specifically, the second insulating ring 2 is disposed at the lower end of the ion source shielding cover 12, the grid electrode 4 is fixed between the second insulating ring 2 and the nonmetallic housing 7, and the second insulating ring 2 is disposed to realize electrical insulation between the grid electrode 4 and the ion source shielding cover 12, and facilitate fixing of the grid electrode 4.
In one embodiment, the second insulating ring 2 is fixedly connected with an inner insulating ring 21, the inner insulating ring 21 extends to be blocked between the ion source anode cylinder 14 and the grid 4, and the lower end of the ion source anode cylinder 14 is lapped on the inner insulating ring 21.
Specifically, an inner insulating ring 21 is fixedly connected in the second insulating ring 2, and the inner insulating ring 21 extends to be blocked between the ion source anode cylinder 14 and the grid electrode 4; again, the lower end of the ion source anode cartridge 14 rides on the inner insulator ring 21, thereby further improving the stability of the ion source anode cartridge 14.
Specifically, the first insulating ring 13 and the second insulating ring 2 are ceramic insulating rings, and the nonmetallic housing 7 is a ceramic housing.
In one embodiment, the target body 8 is fixed at one end of the nonmetallic housing 7 far away from the ion source 1, the target body 8 is plated with a getter material for adsorbing deuterium-tritium mixed gas, and the accelerating electrode 3 is fixed on the target body 8.
Specifically, the target body 8 of the embodiment is plated with a getter material for adsorbing the deuterium-tritium mixed gas, so that the pulse deuterium-tritium mixed ion beam and the deuterium-tritium mixed gas adsorbed in the target body 8 are subjected to nuclear reaction, and a 14Mev single-energy pulse neutron beam is emitted.
In one embodiment, the target 8 is provided with a first mounting groove, a metal conductor 10 is fixedly arranged in the first mounting groove, and the accelerating electrode 3 is fixed on the metal conductor 10.
In this embodiment, a metal conductor 10 is disposed between the accelerating electrode 3 and the target 8, and the metal conductor 10 is disposed to provide a voltage drop between the accelerating electrode 3 and the target 8.
In one embodiment, the target 8 is provided with a second mounting groove, and a second permanent magnet 9 is fixedly arranged in the second mounting groove. The second permanent magnet 9 is provided for suppressing secondary electrons in this embodiment.
In the specific packaging process, the ion source 1, the grid electrode 4, the accelerating electrode 3 and the target body 8 are sealed together through a ceramic shell to form a sealing device; the first permanent magnet 5 and the second permanent magnet 9 are inserted after the neutron tube is sealed, and the first permanent magnet 5 and the second permanent magnet 9 can be made of permanent magnet steel in practical implementation.
After the neutron tube is sealed, firstly, exhausting under the high-temperature environment of 450 ℃ to remove the impurity gas adsorbed by each component in the neutron tube; cooling to room temperature after 48 hours of high-temperature exhaust, sucking deuterium gas into the air pressure regulating element 6, adding the first permanent magnet 5 and the second permanent magnet 9, then performing an aging experiment, and checking whether each index of the neutron tube reaches the expected index by using deuterium deuteration reaction, wherein the neutron tube reaching the expected index is regarded as qualified; the qualified neutron tube is subjected to second high-temperature exhaust after the first permanent magnet 5 and the second permanent magnet 9 are taken down; and (3) sucking deuterium-tritium mixed gas into the air pressure regulating element 6 after the second exhaust, adding the first permanent magnet 5 and the second permanent magnet 9, performing targeting aging again, and finally producing the qualified 14Mev single-energy neutron tube.
When the qualified neutron tube is used specifically, the deuterium-tritium mixed gas is discharged in the neutron tube by adjusting the power supply voltage and current of the air pressure adjusting element, so that the air pressure in the neutron tube reaches the required level; then, a certain anode ignition voltage is applied to the ion source 1, usually about 2000V, and the ion source 1 generates deuterium-tritium mixed ions through gas discharge; according to actual needs, pulse negative voltage with proper pulse width, frequency and amplitude is added on the grid electrode 4, and the pulse ion beam is led out from the ion source 1; then, 60-120 kilovolts of negative high voltage is added on the accelerating electrode 3, the pulse ion beam bombards the target body 8 after being accelerated by the negative high voltage, and nuclear reaction is carried out on the pulse ion beam and the deuterium-tritium mixed gas adsorbed in the target body 8, so that 14Mev single-energy pulse neutron beam is generated; and finally, after the neutron beam is excited, the voltage on the grid electrode 4 is rapidly switched from negative voltage to positive voltage, so that the neutron beam is rapidly cut off.
According to the embodiment of the invention, the grid electrode 4 is arranged between the ion source shielding cover 12 and the accelerating electrode 3, the grid electrode 4 is provided with pulse extraction voltage to generate pulse ion beams, and the pulse ion beams are accelerated by the accelerating electrode 3 to finally generate pulse neutron beams; compared with the prior art of cold cathode penning ion source, the method avoids the fluctuation of the pulse front edge caused by the inherent ignition mechanism of the cold cathode penning ion source, thereby realizing the fast pulse characteristic and high repetition frequency of the neutron tube.
In this embodiment, the control mode after the gate electrode 4 is set is different from the original control mode of the cold cathode penning ion source, and the original cold cathode penning ion source realizes neutron pulse excitation by applying positive high-voltage pulse. The present embodiment directs a pulsed ion beam from the ion source 1 by applying a pulsed negative voltage of appropriate pulse width, frequency and amplitude to the gate 4; and by rapidly switching the voltage on the grid electrode 4 from a negative voltage to a positive voltage, a rapid cut-off of the neutron beam is achieved.
According to the embodiment of the invention, the ion source anode cylinder 14 is welded and fixed on the metal head 11 through the first insulating ring 13, so that the vibration resistance and shock resistance of the neutron tube are improved, and the requirement of high shock vibration when the neutron tube is used for logging while drilling can be met.
The embodiment of the invention further provides a logging while drilling instrument, wherein the pulse neutron tube for logging according to any one of the above embodiments is arranged on the logging while drilling instrument.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. The utility model provides a pulse neutron tube for logging, includes ion source, nonmetallic shell, acceleration electrode and target body, its characterized in that still includes the grid, the grid sets up the ion source with between the acceleration electrode, the control mode of grid is: applying a pulse negative voltage to the grid electrode to lead out deuterium-tritium mixed ions generated by gas discharge at the ion source, and switching the pulse negative voltage applied to the grid electrode to a positive voltage after the neutron beam is excited so as to realize the cut-off of the neutron beam; the grid electrode and the ion source are arranged in an insulating mode, and the grid electrode and the accelerating electrode are arranged in an insulating mode.
2. The pulse neutron tube for well logging according to claim 1, wherein the ion source comprises an ion source shielding cover, a metal head is fixedly connected to the upper end of the ion source shielding cover and located in the ion source shielding cover, an ion source anode cylinder is arranged in an annulus between the metal head and the ion source shielding cover, the ion source anode cylinder is connected with a wire, the wire stretches out of the ion source, a first permanent magnet is fixedly connected to the metal head, and the ion source anode cylinder is fixed to the metal head or the ion source shielding cover through a first insulating ring.
3. The pulse neutron tube for well logging of claim 2, further comprising a gas pressure regulating element, one end of the gas pressure regulating element protruding outside the ion source, the other end of the gas pressure regulating element being connected to the ion source shield or the metal head.
4. The pulsed neutron tube for well logging of claim 2, further comprising a second insulating ring fixedly connected to the lower end of the ion source shield, the grid being fixed between the second insulating ring and the nonmetallic housing.
5. The pulse neutron tube for well logging of claim 4, wherein the second insulating ring is fixedly connected with an inner insulating ring, the inner insulating ring extends to be blocked between the ion source anode cylinder and the grid, and the lower end of the ion source anode cylinder is lapped on the inner insulating ring.
6. The pulse neutron tube for well logging of claim 4, wherein the first insulating ring and the second insulating ring are ceramic insulating rings, and the nonmetallic housing is a ceramic housing.
7. The pulse neutron tube for well logging according to claim 1, wherein the target body is plated with a getter material for adsorbing deuterium-tritium mixed gas, the target body is fixed at one end of the nonmetallic housing far away from the ion source, and the accelerating electrode is fixed on the target body.
8. The pulse neutron tube for well logging according to claim 7, wherein the target body is provided with a first mounting groove, a metal conductor is fixedly arranged in the first mounting groove, and the accelerating electrode is fixedly arranged on the metal conductor.
9. The pulse neutron tube for well logging according to claim 7, wherein the target body is provided with a second mounting groove, and a second permanent magnet is fixedly arranged in the second mounting groove.
10. A logging while drilling tool having provided thereon a pulsed neutron tube for well logging according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410194029.1A CN118068435A (en) | 2024-02-21 | 2024-02-21 | Pulse neutron tube for logging and logging while drilling instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410194029.1A CN118068435A (en) | 2024-02-21 | 2024-02-21 | Pulse neutron tube for logging and logging while drilling instrument |
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| Publication Number | Publication Date |
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| CN118068435A true CN118068435A (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410194029.1A Pending CN118068435A (en) | 2024-02-21 | 2024-02-21 | Pulse neutron tube for logging and logging while drilling instrument |
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| CN (1) | CN118068435A (en) |
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