阅读说明：本技术 模拟中子发生器及制备方法、可控中子源故障检测方法 (Analog neutron generator, preparation method thereof and controllable neutron source fault detection method ) 是由 陆杰 魏军学 惠晗 付国华 于 2020-11-17 设计创作，主要内容包括：本发明涉及中子发生器,具体涉及一种模拟中子发生器及制备方法、可控中子源故障检测方法。本发明的目的是解决现有可控中子源仪器用中子发生器存在中子管在无屏蔽的环境下试验时靶压不能超过20KV,远低于实际工况下的靶压,导致部分电参数不能全面检测,可控中子源仪器一旦出现故障,在没有相关中子屏蔽防护的状态下可能会误出中子射线,导致不能立刻全面检测仪器,只能返厂维修,致使维修周期过长的技术问题,提供一种模拟中子发生器及制备方法、可控中子源故障检测方法。该模拟中子发生器能加高压,能电离但不会出射中子射线,使用该装置后,可以测试高压电路及电离电路,对全面分析仪器参数起到了促进作用,确保了试验的安全性。(The invention relates to a neutron generator, in particular to a simulated neutron generator, a preparation method thereof and a fault detection method of a controllable neutron source. The invention aims to solve the technical problems that when a neutron tube is tested in an unshielded environment, the target pressure of the conventional neutron source for a controllable neutron source instrument cannot exceed 20KV and is far lower than the target pressure under an actual working condition, so that partial electric parameters cannot be detected comprehensively, once the controllable neutron source instrument fails, neutron rays can be mistakenly emitted under the condition without related neutron shielding protection, so that the instrument cannot be detected comprehensively at once, and the instrument can only be returned to a factory for maintenance, so that the maintenance period is too long, and provides a simulated neutron generator, a preparation method and a controllable neutron source failure detection method. The simulation neutron generator can be used for applying high voltage and ionizing neutron rays but cannot emit neutron rays, and after the simulation neutron generator is used, a high-voltage circuit and an ionization circuit can be tested, so that the parameter of a comprehensive analysis instrument is promoted, and the safety of the test is ensured.)

1. An analog neutron generator comprises a reactor filled with SF₆Gaseous casing to and transformer and the voltage doubling circuit of setting in the casing, two outputs of transformer are connected its characterized in that with two inputs of voltage doubling circuit: also included are a dummy load and an ion source; the resistance of the dummy load is the same as the resistance of the neutron tube of the actual neutron generator; the output end of the voltage doubling circuit is connected with the input end of the dummy load; the power supply end of the ion source is connected with the anode voltage, and the input end of the ion source is connected with the hot wire voltage.

2. The analog neutron generator of claim 1, wherein: the dummy load is a resistance of 2G 50W.

3. The analog neutron generator of claim 1 or 2, wherein: the anode voltage is 2000V-2500V.

4. The analog neutron generator of claim 3, wherein: the voltage of the hot wire is 0V-5V.

5. A method of making an analog neutron generator, comprising the steps of:

1) taking out the neutron tube of the failed neutron generator, and replacing the original neutron tube with an ion source with the same parameters and a dummy load with the same resistance value on the premise of determining that the transformer and the voltage doubling circuit have normal performance; connecting the output end of the voltage doubling circuit with the input end of the dummy load, connecting the power supply end of the ion source with an anode voltage interface, and respectively connecting the two input ends of the ion source with two hot wire voltage interfaces;

2) enclosure shellFilling with SF₆A gas.

6. A method for detecting a fault of a controllable neutron source based on the analog neutron generator of any one of claims 1 to 4, characterized by comprising the following steps:

1) taking out a neutron generator in the controllable neutron source;

2) installing the simulated neutron generator;

3) and electrifying the controllable neutron source, and carrying out fault detection on the parts except the simulated neutron generator in the controllable neutron source.

Technical Field

The invention relates to a neutron generator, in particular to a simulated neutron generator, a preparation method thereof and a fault detection method of a controllable neutron source.

Background

The neutron generator in the controllable neutron source instrument used in the oil exploration has a structure shown in figure 1, and comprises a shell filled with SF₆And a transformer, a voltage doubling circuit and a neutron tube. The neutron generator controls an ion source circuit of the neutron tube through the voltage doubling circuit to realize ionization of deuterium molecules, and high voltage provided by the voltage doubling circuit can enable deuterium ions generated by ionization to bombard a tritium target of the neutron tube under the accelerating voltage of a high-voltage electric field so as to generate neutrons. During oil exploration, neutrons generated by the controllable neutron source instrument interact with stratum elements to generate inelastic scattering gamma rays and capture gamma rays, and important logging information is provided for detecting the residual oil saturation of the stratum through measurement of the gamma rays.

When the neutron generator is tested in an environment without neutron shielding protection, the target pressure of the neutron tube cannot exceed 20KV and is far lower than the target pressure (about 100KV) under an actual working condition, so that partial electrical parameters cannot be comprehensively detected. Because the neutron generator may generate neutron rays by mistake during maintenance, after a controllable neutron source instrument with the neutron generator fails, a manufacturer and a user cannot detect the instrument comprehensively under the condition of no related neutron shielding protection, most of the failed instruments (possibly having the failure of the neutron generator) are returned to the manufacturer, and the manufacturer performs related maintenance under the protection condition. Therefore, the fault position is not convenient to judge at the first time, the maintenance period of the instrument is prolonged, and the use of a client is influenced.

Disclosure of Invention

The invention aims to solve the technical problems that the target pressure of a neutron tube cannot exceed 20KV and is far lower than the target pressure under the actual working condition when the neutron tube is tested in an unshielded environment in the conventional neutron source instrument for the controllable neutron source instrument, so that the electrical parameters cannot be comprehensively detected, and once the controllable neutron source instrument fails, neutron rays can be mistakenly emitted under the state without related neutron shielding protection, so that the instrument cannot be comprehensively detected immediately and can only be returned to a factory for maintenance, and the maintenance period is overlong, and provides a simulated neutron generator, a preparation method and a controllable neutron source failure detection method.

In order to solve the technical problems, the technical solution provided by the invention is as follows:

the invention provides an analog neutron generator, which comprises a reactor filled with SF₆Gaseous casing to and transformer and the voltage doubling circuit of setting in the casing, two outputs of transformer are connected its characterized in that with two inputs of voltage doubling circuit: also included are a dummy load and an ion source; the resistance of the dummy load is the same as the resistance of the neutron tube of the actual neutron generator; the output end of the voltage doubling circuit is connected with the input end of the dummy load; the power supply end of the ion source is connected with the anode voltage, and the input end of the ion source is connected with the hot wire voltage.

Further, the dummy load is a resistance of 2G 50W.

Furthermore, the anode voltage is 2000V-2500V.

Furthermore, the voltage of the hot wire is 0V-5V.

The invention also provides a preparation method of the simulated neutron generator, which is characterized by comprising the following steps:

1) taking out the neutron tube of the failed neutron generator, and replacing the original neutron tube with an ion source with the same parameters and a dummy load with the same resistance value on the premise of determining that the transformer and the voltage doubling circuit have normal performance; connecting the output end of the voltage doubling circuit with the input end of the dummy load, connecting the power supply end of the ion source with an anode voltage interface, and respectively connecting the two input ends of the ion source with two hot wire voltage interfaces;

2) enclosing the housing, filling with SF₆A gas.

The invention also provides a method for detecting the fault of the controllable neutron source, which is based on the simulated neutron generator and is characterized by comprising the following steps of:

1) taking out a neutron generator in the controllable neutron source;

2) installing the simulated neutron generator;

3) and electrifying the controllable neutron source, and carrying out fault detection on the parts except the simulated neutron generator in the controllable neutron source.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the simulated neutron generator, the preparation method and the controllable neutron source fault detection method, the simulated neutron generator can be subjected to high voltage application and can be ionized but cannot emit neutron rays, and after the simulated neutron generator is used, a high-voltage circuit and an ionization circuit can be tested, so that the promotion effect on the comprehensive analysis of the parameters of the controllable neutron source instrument is achieved, and the safety of the test is ensured. The neutron ray detector can be used in instrument maintenance and instrument manufacturing tests, not only is convenience for manufacturers to carry out partial tests, but also is convenient for users to carry out fault judgment, and the phenomenon that neutron rays are mistakenly emitted can be avoided. The problem that partial electric parameters can not be detected comprehensively due to the fact that target pressure cannot exceed 20KV and is far lower than the target pressure under actual working conditions when a neutron tube is tested in an unshielded environment in the conventional neutron generator for the controllable neutron source instrument is solved.

2. The simulation neutron generator can be widely applied to the maintenance, debugging and other work of controllable neutron source instruments of oil companies and nuclear logging enterprises, can improve the work quality, is convenient for maintenance departments to improve the work efficiency, and has the advantages of safety, environmental protection, convenience and the like.

Drawings

FIG. 1 is a schematic view of a conventional neutron generator;

FIG. 2 is a schematic diagram of the structure of the simulated neutron generator of the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

An analog neutron generator comprises a SF filled with insulation₆The ion source comprises a gas shell, a transformer and a voltage doubling circuit, wherein the transformer and the voltage doubling circuit are arranged in the shell, two output ends of the transformer are connected with two input ends of the voltage doubling circuit, and the ion source also comprises a dummy load (used for simulating the working state of the existing neutron tube) and an ion source (used for emitting ions); the resistance of the dummy load is 2G 50W, which is the same as the resistance of a neutron tube of an actual neutron generator; the timesThe output end of the voltage circuit is connected with the input end of the dummy load; the power supply end of the ion source is connected with the anode voltage, and the input end of the ion source is connected with the hot wire voltage. The anode voltage is 2000V-2500V. The voltage of the hot wire is 0V-5V.

A method of making an analog neutron generator, comprising the steps of:

1) taking out the neutron tube of the failed neutron generator, and replacing the original neutron tube with an ion source with the same parameters and a dummy load with the same resistance value on the premise of determining that the transformer and the voltage doubling circuit have normal performance; connecting the output end of the voltage doubling circuit with the input end of the dummy load, connecting the power supply end of the ion source with an anode voltage interface, and respectively connecting the two input ends of the ion source with two hot wire voltage interfaces;

2) sealing the housing and filling with SF₆A gas.

A method for detecting faults of a controllable neutron source is based on the simulated neutron generator and comprises the following steps:

1) taking out a neutron generator in the controllable neutron source;

2) installing the simulated neutron generator;

3) and electrifying the controllable neutron source, and carrying out fault detection on the parts except the simulated neutron generator in the controllable neutron source.

When a circuit of the controllable neutron source instrument breaks down, if a target pressure sampling circuit is damaged, although the target pressure actually exists, the target pressure cannot be detected due to circuit failure, neutrons may be generated at this time, and neutron rays are emitted by mistake. Under the condition of no related neutron shielding protection, most of the failed controllable neutron source instruments can only be returned to manufacturers. The simulated neutron generator of the invention has the advantages that the neutron tube is replaced by the dummy load and the ion source, so that the phenomenon of mistakenly emitting neutron rays is avoided, when the controllable neutron source instrument breaks down, the instrument can be comprehensively detected at any time and any place, the operation is safe and convenient, and the maintenance period is greatly shortened.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.