Neutron tube shell cleaning detection device and detection method

Abstract

The application discloses a kind of neutron tube shell clean detection device and detection method, detection device includes workbench;Support and sealing device are respectively arranged in the top of workbench both ends, support and sealing device are respectively equipped with discharge unit and observation piece on, discharge unit is electrically connected with control system, and magnetic steel column is equipped on control system;Vacuum system and inflation system are electrically connected with control system, and vacuum system and inflation system are connected with neutron tube and sealing device;Wherein, when detecting neutron tube, observation piece is used to observe whether the flash occurs in the inner wall of neutron tube, to judge whether the inner wall clean of neutron tube shell meets the requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum well logging, and in particular relates to a neutron tube shell cleanliness detection device and a detection method. Background Art

[0002] During oil well logging, all types of neutron logging instruments require sealed neutron tubes. The working principle of a sealed neutron tube is that an ion source ionizes deuterium (tritium) into ions. A negative high voltage of 100 kV is applied to the accelerating electrode. The ions gain energy from the accelerating electrode and bombard a target adsorbed with tritium, causing a nuclear reaction to produce neutrons (D+T→He+n+Q). Currently, the most commonly used sealed neutron tube in China is the domestically produced Penning ion source neutron tube. This neutron tube structure consists of four main components: a housing, an ion source, an accelerating electrode, and a target. The housing provides insulation, support, and sealing; the ion source ionizes deuterium (tritium) into deuterium (tritium) ions for the accelerating electrode and ion acceleration; the accelerating electrode guides and accelerates the deuterium (tritium) ions to bombard the target surface; and the target adsorbs the tritium (deuterium) gas required for the nuclear reaction.

[0003] At the current stage of development, the manufacturing process of neutron tubes is as follows: parts processing and treatment → neutron tube assembly → welding → exhaust → neutron tube aging test → inspection. However, there is a critical link in this manufacturing process that affects the quality of neutron tubes: the treatment step. If the surface treatment of the neutron tube shell is not clean or the shell has defects before assembly, the neutron tube will cause the following problems after it is manufactured: First, the tube wall will cause serious sparks during operation, which may damage the inner tube wall of the neutron tube and make it unusable, or even penetrate the tube wall and the neutron tube testing equipment; second, the acceleration high pressure cannot be applied, resulting in low neutron tube output that cannot meet well logging requirements; third, the neutron tube will operate unstably, fail to meet the specifications of the well logging instrument, and cannot be used. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to provide a neutron tube shell cleanliness detection device and detection method.

[0005] According to a first aspect of the present invention, a neutron tube housing cleanliness detection device is provided, comprising:

[0006] Workbench;

[0007] The support member and the sealing device are respectively arranged at both ends of the top of the workbench. The support member and the sealing device are respectively provided with a discharge unit and an observation member. The discharge unit is electrically connected to the control system, and the control system is provided with a magnetic steel column.

[0008] The vacuum system and the gas filling system are both electrically connected to the control system, and are both connected to the neutron tube and the sealing device;

[0009] When inspecting the neutron tube, the observation piece is used to observe whether flash occurs on the inner wall of the neutron tube.

[0010] Furthermore, sealing members are provided at both ends of the sealing device, a mounting groove is provided on one side of the supporting member close to the sealing device, an elastic member is provided in the mounting groove, and the discharge unit extends into the interior of the sealing device through the elastic member.

[0011] Furthermore, the sealing device is a sealing cavity, which is composed of an upper shell and a lower shell, and the upper shell and the lower shell are movably connected.

[0012] Furthermore, the upper shell and the lower shell are both made of stainless steel, wherein a heating element and a heat insulating layer are provided in the lower shell.

[0013] Furthermore, both the upper shell and the lower shell are semi-cylinders.

[0014] Furthermore, the heating element is a heating rod.

[0015] Furthermore, the shell of the heating rod is made of ceramic material.

[0016] Furthermore, the vacuum system includes a vacuum unit, which is connected to the sealing device through a pipeline, and a first vacuum valve is provided on the pipeline;

[0017] The vacuum unit is also connected to the sealing device and the neutron tube respectively through a regulating pipe, wherein a second vacuum valve is provided on the regulating pipe connected to the neutron tube.

[0018] Furthermore, the gas filling system includes a hydrogen cylinder and an insulating gas cylinder, the hydrogen cylinder is connected to the neutron tube, and a hydrogen volume film pressure gauge is provided between the hydrogen cylinder and the neutron tube;

[0019] The insulating gas cylinder is connected to the sealing device, and a pressure gauge is provided between the insulating gas cylinder and the sealing device.

[0020] According to a second aspect of the present invention, a detection method is provided, wherein the method uses the detection device as described above to perform detection, comprising:

[0021] Assemble the neutron tube and install it in the sealing device;

[0022] Evacuate the neutron tube and seal;

[0023] The sealing device is filled with insulating gas.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The detection device first installs the assembled neutron tube in a sealed cavity, then evacuates the neutron tube and then the sealed cavity and fills it with insulating gas. During the process of spark detection on the inner wall of the neutron tube through the discharge unit, the observation unit can observe whether the inner wall of the neutron tube has a flash phenomenon. Based on whether the flash phenomenon occurs, it can be determined whether the inner wall of the neutron tube is clean, ensuring the reliability of the neutron tube quality and improving the safety of the neutron tube during use.

[0026] 2. After testing, the high-pressure addition of the neutron tube is smooth and can meet the production requirements.

[0027] 3. This detection device can prevent the neutron tube from sparking during logging operations, ensuring that the neutron tube works stably and meets the logging instrument indicators.

[0028] 4. The detection device detects the neutron tube shell under oil-free conditions, avoiding the problem of shell contamination.

[0029] 5. When using this detection device to detect the outer shell of a neutron tube, it is only necessary to replace the ion source and target to detect the outer shells of neutron tubes of different models, and it has a wide range of applications.

[0030] 6. The detection device can also detect the stability of the ion source. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A cross-sectional view of the overall structure of a neutron tube shell cleanliness detection device provided by the present invention;

[0033] Figure 2 A schematic cross-sectional view of a sealed cavity in a neutron tube housing cleanliness detection device provided by the present invention;

[0034] Figure 3 This is a schematic diagram of neutron tube assembly;

[0035] Figure 4 Installation diagram of the anti-leakage unit:

[0036] Wherein: 1, workbench; 2, high-voltage line fixing frame; 3, sealed cavity; 301, heating rod; 302, heat insulation layer; 303, A95 ceramic; 304, observation window; 4, neutron tube; 401, ion source; 402, O-shaped sealing ring; 403, shell; 405, target; 406, accelerating pole; 407, ion source cover; 408, magnetic steel column; 5, vacuum system; 501, first vacuum valve; 502, second vacuum valve; 503, first gauge; 504, second gauge; 505, first air release valve; 506, second air release valve; 6, inflation system; 601, hydrogen bottle; 6011, first switch valve; 602, hydrogen volume diaphragm pressure gauge; 603, insulating gas bottle; 6031, second switch valve; 6032, pressure gauge; 7, control system; 701, power supply. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0039] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the embodiments of the present application, it should be noted that if the orientation or position relationship indicated by the terms "upper", "lower", "horizontal", "inner" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the present application is usually placed, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] The present invention is described in further detail below with reference to the accompanying drawings:

[0044] See also Figure 1, the first aspect of the embodiment of the present invention discloses a neutron tube shell cleanliness detection device, comprising: a workbench 1; a support member and a sealing device are provided on the top of the workbench 1, the support member and the sealing device are respectively arranged at the two ends of the top of the workbench 1, a discharge unit and an observation member are respectively provided on the support member and the sealing device, the discharge unit is electrically connected to the control system 7, the control system 7 is provided with a magnetic steel column 408, a vacuum system 5 and an inflation system 6, both of which are electrically connected to the control system 7; the neutron tube 4 to be detected is assembled, and an accelerating electrode 406 and an ion source cover 407 are respectively plugged and installed in the two ends of the neutron tube 4, and the ends of the accelerating electrode 406 and the ion source cover 407 are sealed and connected to the two ends of the neutron tube 4 through O-type sealing gaskets to ensure the reliability of the detection operation; a target 405 is welded to the end of the accelerating electrode 406, and an ion source 401 is provided in the ion source cover 407, and the assembled neutron tube 4 is placed in the sealing device, wherein the middle part of the neutron tube 4 is located In the sealing device, the two ends of the neutron tube 4 are respectively located on opposite sides of the sealing device, and one end is matched with the support member, and the other end is installed with a magnetic steel column 408. Finally, the vacuum system 5 and the inflation system 6 are connected to the neutron tube 4 and the sealing device. During the inspection process, the neutron tube 4 and the sealing device are first evacuated by the vacuum system 5. When the vacuum degree in the neutron tube 4 and the sealing device reaches a certain standard, the ion source 401 is filled with hydrogen, and then the vacuum is again evacuated. Finally, the sealing device is filled with insulating gas to complete the vacuum and inflation operations. Subsequently, the sealing device is heated on one side by the control system 7, and the other end is conductive to perform an ignition test. Among them, when inspecting the neutron tube 4, the inner wall of the neutron tube 4 is observed through the observation piece on the sealing device to observe whether there is flash. If the observation piece observes the inner wall of the neutron tube 4 with ignition flash, it indicates that the cleanliness of the inner wall of the neutron tube 4 does not meet the standard. If there is no ignition flash, it indicates that the cleanliness of the inner wall of the neutron tube 4 meets the standard.

[0045] Furthermore, sealing members are provided at both ends of the sealing device. After the neutron tube 4 is installed on the sealing device, the sealing member can seal the sealing device. The support member has a mounting groove on the side close to the sealing device. One end of the neutron tube 4 outside the sealing device extends into the mounting groove. An elastic member is provided in the mounting groove. The elastic member can tighten the neutron tube 4. The discharge unit extends into the interior of the sealing device through the elastic member. Specifically, the sealing device is a sealing cavity 3, which consists of an upper shell and a lower shell. The upper shell and the lower shell are movably connected. When inspecting the inner wall of the outer shell 403 of the neutron tube 4, the upper shell is opened and the neutron tube 4 is installed between the upper shell and the lower shell. The outer shell 403 of the neutron tube 4 is located in the cavity of the upper shell and the lower shell, while the two ends of the outer shell 403 of the neutron tube 4 are located outside the sealing device; further, the upper shell and the lower shell are both made of stainless steel, wherein a heating element and an insulating layer 302 are provided in the lower shell. The heating element is used to heat the inside of the sealed cavity 3 after installation, and the insulating layer 302 is used to prevent the heat in the sealed cavity 3 from leaking out.

[0046] In this embodiment, both the upper shell and the lower shell are semi-cylinders, which can better cooperate with the outer shell 403 of the neutron tube 4. A95 ceramic is provided on the lower shell, and the A95 ceramic is welded to the lower shell after metallization; the heating element is a heating rod 301, and the shell of the heating rod 301 is made of ceramic material, which can make the heating power reach 2000w, and the insulating layer 302 is a thermal insulation material; the observation element is an observation window 304, which is made of quartz glass and installed on the upper shell.

[0047] In this embodiment, the support member is a high-voltage wire fixing frame 2, which is vertically installed on the top of the workbench 1. A mounting groove is provided on the side of the high-voltage wire fixing frame 2 close to the sealed cavity 3. The elastic member is installed in the middle of the mounting groove, one end is fixedly connected to the mounting groove, and the other end is against the target 405; the control system 7 includes a power supply 701 and a controller. The power supply 701 is electrically connected to the heating rod 301 to control the opening or closing of the heating rod 301. The controller is electrically connected to the discharge unit and the magnetic steel column 408. The discharge unit is a high-voltage cable.

[0048] In this embodiment, the vacuum system 5 includes a vacuum unit connected to a sealing device via a pipeline, wherein a first vacuum valve 501 is provided on the pipeline. The vacuum unit is also connected to the sealing device and the neutron tube 4 via a gauge pipe, wherein the gauge pipe connected to the neutron tube 4 is provided with a second vacuum valve 502. Furthermore, the vacuum unit evacuates the sealing device via the first vacuum valve 501 and evacuates the outer shell 403 of the neutron tube 4 via the second vacuum valve 502. Specifically, two gauge pipes are provided, namely a first gauge pipe 503 and a second gauge pipe 504. The first gauge pipe 503 is used to measure the vacuum level within the outer shell 403 of the neutron tube 4, and the second gauge pipe 504 is used to measure the vacuum level within the sealing device. The vacuum system 5 also includes a first vent valve 505 and a second vent valve 506, which are used to deflate the sealing device and the outer shell 403 of the neutron tube 4, respectively.

[0049] In this embodiment, the gas filling system 6 includes a hydrogen cylinder 601 and an insulating gas cylinder 603. The hydrogen cylinder 601 is connected to the neutron tube 4. After the outer shell 403 of the neutron tube 4 is evacuated, the second vacuum valve 502 is closed and the first switch valve 6011 is opened. The hydrogen in the hydrogen cylinder 601 is filled into the outer shell 403 of the neutron tube 4. A hydrogen volume film pressure gauge 602 is provided between the hydrogen cylinder 601 and the neutron tube 4. The amount of hydrogen filled is measured by the hydrogen volume film pressure gauge 602. During the inspection operation of the inner wall of the outer shell 403 of the neutron tube 4, the target 405 needs to be Because a high voltage of 120 kV is applied, the housing 403 of the neutron tube 4 must operate in an insulating environment. Therefore, the second vacuum valve 502 is first closed, the first vacuum valve 501 is opened, and the sealing device is evacuated using the vacuum unit. Then, the first vacuum valve 501 is closed, the insulating gas bottle 603 is connected to the sealing device, and the second switch valve 6031 is opened to fill the sealing device with insulating gas to a sufficient pressure through the insulating gas bottle 603. A pressure gauge 6032 is provided between the insulating gas bottle 603 and the sealing device to measure the amount of insulating gas filled.

[0050] According to a second aspect of the present invention, a detection method is provided, wherein the detection method uses the above-mentioned detection device for detection, comprising:

[0051] Step 1: Assemble the neutron tube 4 and install it in the sealing device; install O-rings 402 on the outside of the accelerating electrode 406 and the ion source cover 407 respectively, then plug and unplug the accelerating electrode 406 and the ion source cover 407 into the two ends of the shell 403 of the neutron tube 4, and let the shell 403 into the sealing device.

[0052] Step 2: Evacuate the neutron tube 4 and the sealing device; open the first vacuum valve 501 and the second vacuum valve 502, and evacuate the outer shell 403 of the neutron tube 4 and the sealing device respectively. The vacuum degree in the outer shell 403 of the neutron tube 4 needs to reach 5×10-6Pa, and the vacuum degree in the sealing device needs to reach 5×10-4Pa. Then, open the first switch valve 6011 to fill the ion source 401 with hydrogen. After the filling is completed, close the first switch valve 6011, and finally open the second vacuum valve 502 to evacuate to 5×10-6Pa.

[0053] Step 3: Fill the sealing device with insulating gas; open the second switch valve 6031 to allow the insulating gas cylinder 603 to fill the sealing device with insulating gas. After the insulating gas content reaches 00.5 MPa, close the second switch valve 6031 to end the filling. Finally, perform an ignition test to detect the cleanliness of the inner wall of the shell 403 of the neutron tube 4.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A neutron tube shell cleanliness detection device, characterized in that: include: Workbench (1); A support member and a sealing device are respectively arranged at two ends of the top of the workbench (1); a discharge unit and an observation member are respectively provided on the support member and the sealing device; the discharge unit is electrically connected to a control system (7); and a magnetic steel column (408) is provided on the control system (7); The vacuum system (5) and the inflation system (6) are both electrically connected to the control system (7), and the vacuum system (5) and the inflation system (6) are both connected to the neutron tube (4) and the sealing device; The vacuum system (5) comprises a vacuum unit, the vacuum unit is connected to a sealing device via a pipeline, and a first vacuum valve (501) is provided on the pipeline; The vacuum unit is also connected to the sealing device and the neutron tube (4) respectively through a regulating tube, wherein the regulating tube connected to the neutron tube (4) is provided with a second vacuum valve (502); The inflation system (6) comprises a hydrogen cylinder (601) and an insulating gas cylinder (603), the hydrogen cylinder (601) being connected to the neutron tube (4), and a hydrogen volume film pressure gauge (602) being provided between the hydrogen cylinder (601) and the neutron tube (4); The insulating gas cylinder (603) is connected to the sealing device, and a pressure gauge (6032) is provided between the insulating gas cylinder (603) and the sealing device; When the neutron tube (4) is inspected, the observation piece is used to observe whether flash occurs on the inner wall of the neutron tube (4).

2. The detection device according to claim 1, characterized in that Both ends of the sealing device are provided with sealing members, a side of the supporting member close to the sealing device has a mounting groove, an elastic member is provided in the mounting groove, and the discharge unit extends into the interior of the sealing device through the elastic member.

3. The detection device according to claim 1 or 2, characterized in that: The sealing device is a sealing cavity (3), and the sealing cavity (3) is composed of an upper shell and a lower shell, and the upper shell and the lower shell are movably connected.

4. The detection device according to claim 3, characterized in that The upper shell and the lower shell are both made of stainless steel, wherein a heating element and a heat insulating layer (302) are provided in the lower shell.

5. The detection device according to claim 3, characterized in that The upper shell and the lower shell are both semi-cylinders.

6. The detection device according to claim 4, characterized in that The heating element is a heating rod (301).

7. The detection device according to claim 6, characterized in that The shell of the heating rod (301) is made of ceramic material.

8. A neutron tube shell cleanliness detection method, characterized in that: The detection method is performed using the detection device according to any one of claims 1 to 7, comprising: Assemble the neutron tube and install it in the sealing device; evacuating the neutron tube and the sealing device; The sealing device is filled with insulating gas.

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