Compensating neutron radioactive section and compensating neutron logging instrument

Abstract

This invention relates to the field of oil and gas exploration and development, and discloses a compensated neutron emission sub and a compensated neutron logging tool. The compensated neutron emission sub includes a shield, a source chamber shell, a source chamber, a neutron emission source, a first conduit, a first conduit connector, a second conduit connector, and a plug-in component. The source chamber shell has a first end and a second end, with the first end facing the detector sub. The shield is disposed at the first end of the source chamber shell, and the plug-in component is disposed at the second end of the source chamber shell. The source chamber is disposed inside the source chamber shell, and the neutron emission source is disposed inside the source chamber. The first conduit is fixed to the outer wall of the source chamber shell through the first and second conduit connectors. By setting the conduit on the outer wall of the source chamber shell, the source chamber shell can be integrally machined, avoiding welding processes. This not only simplifies the manufacturing process but also improves the safety of the compensated neutron logging tool.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration and development technology, specifically to a compensated neutron radiation sub and a compensated neutron logging instrument. Background Technology

[0002] Compensated neutron logging is a logging method applicable to both open-hole and cased wells, primarily used to determine formation porosity and identify gas-bearing zones. Compensated neutron logging utilizes an isotopic neutron source to emit fast neutrons into the formation. Different elements have varying abilities to slow down neutrons; heavy elements have the weakest slowing effect, while hydrogen has the strongest. In porous formations, the hydrogen content in the framework material is negligible, while water and oil within the pores do contain hydrogen. Compensated neutron logging tools can detect the hydrogen content in the formation based on the interaction between neutrons and hydrogen, thereby inferring formation porosity. Furthermore, the slowing effect of gas-bearing zones on neutrons is much lower than that on neutrons in oil and water layers. Therefore, during compensated neutron logging, anomalies will appear in the count rate readings of gas-bearing formations, which can be used to identify gas-bearing zones.

[0003] In compensated neutron logging tools, the radioactive sub is a key component responsible for emitting fast neutrons; it is the mechanical structure housing the neutron source for emitting fast neutrons. The radioactive sub typically includes a neutron source, source chamber, source chamber shell, shielding, and a through-wire channel; currently, the through-wire channel is generally located within the source chamber shell wall. Due to the constraints of the through-wire channel's location, the source chamber shell can generally only be obtained through segmented machining and welding.

[0004] However, this method of segmented processing and welding to produce the source chamber shell is complex. At the same time, the welding process not only makes the factory inspection cumbersome, but also results in insufficient safety of the compensated neutron logging tool based on the source chamber shell. It requires multiple periodic inspections throughout the entire life cycle of the compensated neutron logging tool, which is time-consuming and labor-intensive. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of complex production processes and insufficient safety of compensated neutron logging tools caused by the segmented processing and welding of the source chamber shell in the prior art. This invention provides a compensated neutron radiation sub and a compensated neutron logging tool.

[0006] To achieve the above objectives, the first aspect of the present invention provides a compensating neutron emission short section, comprising: a shield, a source chamber shell, a source chamber, a neutron emission source, a first conduit, a first conduit connector, a second conduit connector, and a plug-in component;

[0007] The source chamber shell has a first end and a second end opposite to each other. The first end of the source chamber shell is the first end facing the detector subsection. The shield is disposed at the first end of the source chamber shell. The plug-in component is disposed at the second end of the source chamber shell. The source chamber is disposed inside the source chamber shell. The neutron radiation source is disposed inside the source chamber.

[0008] The first conduit is fixed to the outer wall of the source chamber shell through the first conduit connector and the second conduit connector.

[0009] In this embodiment of the application, the outer wall of the source chamber shell is provided with a first groove, and the first conduit is arranged in the first groove.

[0010] In this embodiment of the application, the compensated neutron emission short section further includes a second conduit, a third conduit connector and a fourth conduit connector, and the outer wall of the source chamber shell is also provided with a second groove;

[0011] The second conduit is fixed to the outer wall of the source chamber shell through the third conduit connector and the fourth conduit connector, and the second conduit is arranged in the second groove.

[0012] In this embodiment of the application, the first conduit connector and the third conduit connector are located at the first end of the source chamber housing, and the second conduit connector and the fourth conduit connector are located at the second end of the source chamber housing.

[0013] In this embodiment of the application, the first conduit connector has an inlet end and an outlet end. The inlet end of the first conduit connector is located outside the source chamber housing, and the outlet end of the first conduit connector extends into the source chamber housing.

[0014] The second conduit connector has an inlet end and an outlet end. The inlet end of the second conduit connector is located outside the source chamber housing, and the outlet end of the second conduit connector extends into the source chamber housing.

[0015] The first conduit has a first end and a second end, the first end of the first conduit extends into the inlet end of the first conduit connector, and the second end of the first conduit extends into the inlet end of the second conduit connector.

[0016] In this embodiment of the application, a sealing ring is provided between the inlet end of the first conduit connector and the first end of the first conduit, and a sealing ring is provided between the inlet end of the second conduit connector and the second end of the first conduit.

[0017] A sealing ring is provided between the outlet end of the first conduit connector and the outer shell of the source chamber, and a sealing ring is provided between the outlet end of the second conduit connector and the outer shell of the source chamber.

[0018] In this embodiment of the application, the third conduit connector has an inlet end and an outlet end. The inlet end of the third conduit connector is located outside the source chamber housing, and the outlet end of the third conduit connector extends into the source chamber housing.

[0019] The fourth conduit connector has an inlet end and an outlet end. The inlet end of the fourth conduit connector is located outside the source chamber housing, and the outlet end of the fourth conduit connector extends into the source chamber housing.

[0020] The second conduit has a first end and a second end opposite to each other. The first end of the second conduit extends into the inlet end of the third conduit connector, and the second end of the second conduit extends into the inlet end of the fourth conduit connector.

[0021] In this embodiment of the application, a sealing ring is provided between the inlet end of the third conduit connector and the first end of the second conduit, and a sealing ring is provided between the inlet end of the fourth conduit connector and the second end of the second conduit.

[0022] A sealing ring is provided between the outlet end of the third conduit connector and the outer shell of the source compartment, and a sealing ring is provided between the outlet end of the fourth conduit connector and the outer shell of the source compartment.

[0023] In this embodiment, the first conduit connector, the second conduit connector, the third conduit connector, and the fourth conduit connector are all elbow connectors.

[0024] In this embodiment of the application, the first conduit connector, the second conduit connector, the third conduit connector, and the fourth conduit connector are fixed to the outer shell of the source compartment by screws.

[0025] In this embodiment of the application, both the first conduit and the second conduit are made of Inconel 718 alloy.

[0026] The second aspect of the present invention provides a compensated neutron logging tool, characterized in that it includes an electronic circuit sub, a detector sub, and a compensated neutron emission sub of the first aspect;

[0027] The electronic circuit section, the detector section, and the compensated neutron emission section are connected in sequence.

[0028] The compensated neutron emission sub-junction, as described above, includes a shield, a source chamber shell, a source chamber, a neutron emission source, a first conduit, a first conduit connector, a second conduit connector, and a plug-in component. The source chamber shell has a first end and a second end, with the first end facing the detector sub-junction. The shield is disposed at the first end of the source chamber shell, and the plug-in component is disposed at the second end of the source chamber shell. The source chamber is located inside the source chamber shell, and the neutron emission source is located inside the source chamber. The first conduit is fixed to the outer wall of the source chamber shell via the first and second conduit connectors. Based on the structure of the compensated neutron emission sub-junction provided in this application, by providing a conduit on the outer wall of the source chamber shell, the source chamber shell can be integrally machined, avoiding welding processes. That is, the source chamber shell can be directly machined from bar stock, rather than being machined in sections and then welded. This not only simplifies the production process but also improves the safety of the compensated neutron logging tool.

[0029] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0031] Figure 1 The schematic diagram illustrates a structural schematic of a compensated neutron emission sub-section according to an embodiment of this application;

[0032] Figure 2 The schematic diagram illustrates a structural schematic of a compensated neutron emission sub-section according to an embodiment of this application;

[0033] Figure 3 The schematic diagram illustrates a structural schematic of a compensated neutron emission sub-section according to an embodiment of this application;

[0034] Figure 4 The schematic diagram illustrates a structural schematic of a compensated neutron emission sub-section according to an embodiment of this application;

[0035] Figure 5 The schematic diagram illustrates a structural schematic of a conduit connector according to an embodiment of this application;

[0036] Figure 6 The schematic diagram illustrates a structural schematic of a compensated neutron emission sub-section according to an embodiment of this application;

[0037] Figure 7The schematic diagram illustrates the structure of a compensated neutron logging tool according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached figures

[0039] 100 - Compensated neutron emission section; 101 - Shielding body; 102 - Source chamber outer shell; 103 - Source chamber; 104 - Neutron emission source; 105 - First conduit; 106 - First conduit connector; 107 - Second conduit connector; 108 - Connecting component; 109 - Second conduit; 110 - Third conduit connector; 111 - Fourth conduit connector; 200 - Electronic circuit section; 300 - Detector section. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are protected by this application.

[0041] The scope of protection.

[0042] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0044] As described in the background section, compensated neutron logging is a logging method applicable to both open-hole and cased wells, primarily used to determine formation porosity and identify gas-bearing zones. Compensated neutron logging utilizes an isotopic neutron source to emit fast neutrons into the formation. Different elements have varying deceleration capabilities for neutrons; heavy elements have poor deceleration capabilities, while hydrogen has the strongest. In porous formations, the hydrogen content in the framework material is negligible, while water and oil within the pores do contain hydrogen. The compensated neutron logging tool can detect the hydrogen content in the formation based on the interaction between neutrons and hydrogen, thereby inferring formation porosity. Simultaneously, the deceleration capability of gas-bearing zones for neutrons is far lower than that of oil and water zones. Therefore, during compensated neutron logging, anomalies will appear in the count rate readings of gas-bearing formations, thus identifying these zones. In the compensated neutron logging tool, the radioactive sub is a key component responsible for emitting fast neutrons; it is the mechanical structure housing the neutron source for emitting fast neutrons. A radioactive sub typically includes a neutron source, a source chamber, a source chamber shell, a shield, and a through-hole (i.e., a wiring channel). Currently, the through-hole is generally located within the source chamber shell wall. Due to the constraints of the through-hole's location, the source chamber shell is usually manufactured by segmenting and then welding. That is, the shield, radioactive source, and connector sections are manufactured separately and then welded together to form the radioactive sub. However, this segmented manufacturing and welding method for producing the source chamber shell is complex. Furthermore, the welding process not only makes factory inspection cumbersome but also leads to insufficient safety of compensated neutron logging tools based on this source chamber shell (e.g., breakage due to welding). Multiple periodic inspections are required throughout the compensated neutron logging tool's lifespan, which is time-consuming and labor-intensive.

[0045] To address this, one embodiment of this application provides a compensated neutron emission subsection 100, such as... Figures 1-4 As shown, the compensated neutron emission sub-section 100 may include a shield 101, a source chamber shell 102, a source chamber 103, a neutron emission source 104, a first conduit 105, a first conduit connector 106, a second conduit connector 107, and a plug-in component 108. The source chamber shell 102 has a first end and a second end facing each other. The first end of the source chamber shell 102 faces the detector sub-section. The shield 101 is disposed at the first end of the source chamber shell 102. The plug-in component 108 is disposed at the second end of the source chamber shell 102. The source chamber 103 is disposed inside the source chamber shell 102, and the neutron emission source 104 is disposed inside the source chamber 103. The first conduit 105 is fixed to the outer wall of the source chamber shell 102 through the first conduit connector 106 and the second conduit connector 107.

[0046] That is, the compensated neutron emission section 100 may include a shield 101, a source chamber shell 102, a source chamber 103, a neutron emission source 104, a plug-in component 108, and a wiring assembly, the wiring assembly including a first wiring tube 105, a first wiring tube connector 106, and a second wiring tube connector 107.

[0047] in, Figure 1 This can be viewed as a cross-sectional view of the side of the compensated neutron emission short section 100 without the wiring assembly, which is helpful to illustrate the positional relationship of the shield 101, the source chamber shell 102, the source chamber 103, the neutron emission source 104, and the plug-in component 108. Figure 2 This can be viewed as a front view of the compensated neutron emission subsection 100;

[0048] Figure 3 It can be regarded as Figure 2 The bottom view of the compensated neutron emission subsection 100 shown is shown. Figure 4 It can be regarded as Figure 2 The cross-sectional view of the compensated neutron emission subsection 100 shown in the front view direction.

[0049] The fast neutrons emitted by the neutron source 104 need to pass through different substances in the formation, be slowed down by the atomic nuclei of different elements, and then be received by the detector. Only after counting and analysis can the logging results be obtained. The shield 101 serves to shield the fast neutrons emitted by the neutron source 104 from passing directly through the formation.

[0050] The compensated neutron logging tool body is received by the detector, thereby ensuring that the neutrons received by the detector are all neutrons from the formation.

[0051] The neutron source 104, typically an Am-Be source (americium-beryllium source), can be used to emit fast neutrons into the ground. The source chamber 103 serves as a carrier for the neutron source 104, containing and housing it. The connector 108 can be used to connect external devices, such as other data acquisition, data transmission, or data processing equipment. The source chamber housing 102 serves as a carrier for the shield 101, source chamber 103, connector 108, and wiring assembly, used to fix and connect these components. An opening can be made in the source chamber housing 102 during manufacturing for later installation of the source chamber 103.

[0052] In this embodiment of the application, the first conduit 105 can be used as a channel for the through wire harness.

[0053] In specific implementation, to further fix the first conduit 105 and reduce the outer diameter of the compensating neutron emission sub-nodule 100, a first groove is provided on the outer wall of the source chamber housing 102, and the first conduit 105 can be arranged in the first groove. More preferably, the depth of the first groove is adapted to the outer diameter of the first conduit 105, thereby minimizing the protrusion of the first conduit 105 from the outer wall of the source chamber housing 102, and thus minimizing the outer diameter of the compensating neutron emission sub-nodule 100.

[0054] Considering that the compensated neutron logging tool may need to set up a large number of through-wires, if these through-wires are all arranged in the first through-wire tube 105, then the first through-wire tube 105 will need to be set up with more accommodating space. This will make the first through-wire tube 105 thicker, and the wall thickness of the source chamber shell 102 will be difficult to meet the requirements. This will cause the first through-wire tube 105 to protrude from the outer wall of the source chamber shell 102, resulting in a larger outer diameter of the compensated neutron radiation sub 100. Therefore, in one embodiment, the compensated neutron emission sub-section 100 provided in this application may further include a second conduit 109, a third conduit connector 110, and a fourth conduit connector 111 (i.e., the conduit assembly may further include a second conduit 109, a third conduit connector 110, and a fourth conduit connector 111), and the outer wall of the source chamber housing 102 is further provided with a second groove; the second conduit 109 is fixed to the outer wall of the source chamber housing 102 through the third conduit connector 110 and the fourth conduit connector 111, and the second conduit 109 is arranged in the second groove.

[0055] The second conduit 109 is also used to pass through the wire harness. The depth of the second groove is adapted to the outer diameter of the second conduit 109, thereby minimizing the possibility of the second conduit 109 protruding from the outer wall of the source compartment housing 102.

[0056] It is understood that the use of two conduits is merely a specific example and does not imply an undue limitation on the proposed solution. In practical applications, more conduits can be used as needed. The arrangement of each conduit can be referenced to the first conduit 105 and the second conduit 109, and will not be elaborated further here. By distributing the through-wire bundle among multiple conduits, each conduit can be thinner, ensuring that the wall thickness meets the requirements. This minimizes the possibility of conduits protruding from the outer wall of the source chamber shell 102, allowing for a smaller outer diameter of the compensating neutron emission sub-section 100.

[0057] Taking a configuration with a first conduit 105 and a second conduit 109 as an example, the materials of the first conduit 105 and the second conduit 109 can be Inconel 718 alloy, which can improve the temperature and pressure performance of the neutron emission compensation sub-nodule. Testing has shown that when the first conduit 105 and the second conduit 109 are made of Inconel 718 alloy, have an outer diameter of 1 / 4 inch, and a wall thickness of 0.065 inches, they can withstand a high pressure of 140 MPa and a high temperature of 175°C.

[0058] In this embodiment, the first conduit connector 106 and the third conduit connector 110 may be located at the first end of the source chamber housing 102, and the second conduit connector 107 and the fourth conduit connector 111 may be located at the second end of the source chamber housing 102.

[0059] The first conduit connector 106 has an inlet end and an outlet end. The inlet end of the first conduit connector 106 is located outside the source chamber housing 102, and the outlet end of the first conduit connector 106 extends into the source chamber housing 102. Similarly, the second conduit connector 107 has an inlet end and an outlet end. The inlet end of the second conduit connector 107 is located outside the source chamber housing 102, and the outlet end of the second conduit connector 107 extends into the source chamber housing 102.

[0060] Accordingly, the first conduit 105 has a first end and a second end, the first end of the first conduit 105 extending into the inlet end of the first conduit connector 106, and the second end of the first conduit 105 extending into the inlet end of the second conduit connector 107. Thus, the first conduit 105 is installed outside the source compartment housing 102. One end of the through-wire bundle in the first conduit 105 is connected to the detector via the first conduit connector 106 and the shield 101, and the other end is connected to the plug-in component 108 via the second conduit connector 107.

[0061] To further improve the sealing effect and the stability of the first conduit 105, in practical applications, a sealing ring M is provided between the inlet end of the first conduit connector 106 and the first end of the first conduit 105, and a sealing ring M is provided between the inlet end of the second conduit connector 107 and the second end of the first conduit 105. A sealing ring M is provided between the outlet end of the first conduit connector 106 and the source chamber housing 102, and a sealing ring M is provided between the outlet end of the second conduit connector 107 and the source chamber housing 102. Figure 5 As shown. Figure 5 This is a partially enlarged view of the second conduit connector 107. The first conduit connector 106 and the second conduit connector 107 are symmetrical and have similar structures, which can be used as a reference. Figure 5 A magnified view of a portion of the image.

[0062] More preferably, the number of sealing rings M between the inlet end of the first conduit connector 106 and the first end of the first conduit 105 can be two, the number of sealing rings M between the inlet end of the second conduit connector 107 and the second end of the first conduit 105 can be two, the number of sealing rings M between the outlet end of the first conduit connector 106 and the source chamber housing 102 can be two, and the number of sealing rings M between the outlet end of the second conduit connector 107 and the source chamber housing 102 can be two. In practical applications, the sealing rings M can specifically be AS568-010 O-rings.

[0063] Similarly, the third conduit connector 110 has an inlet end and an outlet end, with the inlet end of the third conduit connector 110 located outside the source chamber housing 102 and the outlet end of the third conduit connector 110 extending into the source chamber housing 102; the fourth conduit connector 111 has an inlet end and an outlet end, with the inlet end of the fourth conduit connector 111 located outside the source chamber housing 102 and the outlet end of the fourth conduit connector 111 extending into the source chamber housing 102.

[0064] Accordingly, the second conduit 109 has a first end and a second end, the first end of which extends into the inlet end of the third conduit connector 110, and the second end of which extends into the inlet end of the fourth conduit connector 111. Thus, the second conduit 109 is installed outside the source compartment housing 102. One end of the through-wire bundle in the second conduit 109 is connected to the detector via the third conduit connector 110 and the shield 101, and the other end is connected to the plug-in component 108 via the fourth conduit connector 111.

[0065] To further improve the sealing effect and the stability of the second conduit 109, in practical applications, a sealing ring M is provided between the inlet end of the third conduit connector 110 and the first end of the second conduit 109, and a sealing ring M is provided between the inlet end of the fourth conduit connector 111 and the second end of the second conduit 109. A sealing ring M is provided between the outlet end of the third conduit connector 110 and the source chamber housing 102, and a sealing ring M is provided between the outlet end of the fourth conduit connector 111 and the source chamber housing 102. Figure 5 This is a partially enlarged view of the second conduit connector 107. The fourth conduit connector 111 is the same as the second conduit connector 107. The third conduit connector 110 is symmetrical to the second conduit connector 107 and has a similar structure, which can be referenced. Figure 5 A magnified view of a portion of the image.

[0066] More preferably, the number of sealing rings M provided between the inlet end of the third conduit connector 110 and the first end of the second conduit 109 can be two, the number of sealing rings M provided between the inlet end of the fourth conduit connector 111 and the second end of the second conduit 109 can be two, the number of sealing rings M provided between the outlet end of the third conduit connector 110 and the source chamber housing 102 can be two, and the number of sealing rings M provided between the outlet end of the fourth conduit connector 111 and the source chamber housing 102 can be two.

[0067] In this embodiment, the first conduit connector 106, the second conduit connector 107, the third conduit connector 110, and the fourth conduit 111 can be elbow connectors, specifically, 90-degree elbow connectors, such as... Figure 4 and Figure 5 As shown.

[0068] In practical applications, the first conduit connector 106, the second conduit connector 107, the third conduit connector 110, and the fourth conduit connector 111 can be fixed to the source chamber housing 102 by screws D. For example... Figure 5 As shown, taking the second conduit connector 107 as an example, the second conduit connector 107 may have a fixing part for inserting screw D to fix the second conduit connector 107 to the source compartment housing 102. The method by which the first conduit connector 106, the second conduit connector 107, and the third conduit connector 110 are fixed by screw D can be referenced to the second conduit connector 107, and will not be repeated here. In specific implementation, screw D can be an M4×8 socket head cap screw.

[0069] Because the wall thickness of the source housing 102 is thinner on the side with the opening for mounting the source housing 103 and thicker on the side away from the opening, in order to ensure that the wall thickness meets the requirements for conduit arrangement as much as possible and to avoid the conduit affecting the opening, the first conduit 105 and the second conduit 109 are preferably located on the side of the source housing 102 away from the opening. Furthermore, considering the existing wall thickness distribution characteristics of the source housing 102, with the central axis of the source housing 102 as the center, the included angle between the first conduit 105 and the second conduit 109 is preferably no more than 80°, and they are symmetrically designed, such as... Figure 6 As shown.

[0070] It is understood that the compensated neutron emission section 100 provided in this application embodiment includes: a shield 101, a source chamber shell 102, a source chamber 103, a neutron emission source 104, a first conduit 105, a first conduit connector 106, a second conduit connector 107, and a plug-in component 108; the source chamber shell 102 has a first end and a second end opposite to each other, the first end of the source chamber shell 102 is the first end facing the detector section, the shield 101 is disposed at the first end of the source chamber shell 102, the plug-in component 108 is disposed at the second end of the source chamber shell 102, the source chamber 103 is disposed inside the source chamber shell 102, and the neutron emission source 104 is disposed inside the source chamber 103; the first conduit 105 is fixed to the outer wall of the source chamber shell 102 through the first conduit connector 106 and the second conduit connector 107. Based on the structure of the compensated neutron emission sub 100 provided in this application embodiment, by providing a conduit on the outer wall of the source chamber shell 102, the source chamber shell 102 can be integrally machined, avoiding the need for welding. That is, the source chamber shell 102 can be directly machined from bar stock, rather than being machined in sections and then welded together. This not only simplifies the manufacturing process but also improves the safety of the compensated neutron logging tool.

[0071] Based on the compensated neutron emission subsection provided in the above embodiments of this application, one embodiment of this application also provides a compensated neutron logging tool, such as... Figure 7 As shown, where, Figure 7 The upper figure is a cross-sectional view, and the lower figure is a bottom view. The compensated neutron logging tool may include an electronic circuit sub 200, a detector sub 300, and the compensated neutron emission sub 100 provided in the above embodiments of this application.

[0072] The outer wall of the first end of the source chamber housing 102 can be configured as a threaded ring for connection with the detector subsection 300.

[0073] The electronic circuit section 200 may include a high-voltage power supply, a low-voltage power supply board, and a TCC. Its main functions are counting pulses, receiving commands, uploading logging data, and storing logging data. The detector section 300 may include a preamplifier board and two helium-3 tube detectors (near and far range). Neutrons emitted from the neutron source 104 are decelerated and captured, then converted into thermal neutrons. After entering the helium-3 tube detector, they are converted into negative pulse voltage signals under high voltage. After amplification and discrimination, a 12V pulse signal with variable pulse width is formed. This signal is shaped and level-converted to form a 3.3V pulse signal (OUT) with a certain pulse width, which is directly sent to the TCC's I / O port for counting.

[0074] It is understood that the compensated neutron logging tool provided in the above embodiments of this application has high safety because the source chamber shell 102 in the compensated neutron emission sub 100 can be integrally processed, avoiding welding processes.

[0075] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0076] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A neutron emitting compensator segment, characterized in that, The compensated neutron emission short section includes a shield, a source chamber shell, a source chamber, a neutron emission source, a first conduit, a first conduit connector, a second conduit connector, and a plug-in component; The source chamber shell has a first end and a second end opposite to each other. The first end of the source chamber shell is the first end facing the detector subsection. The shield is disposed at the first end of the source chamber shell. The plug-in component is disposed at the second end of the source chamber shell. The source chamber is disposed inside the source chamber shell. The neutron radiation source is disposed inside the source chamber. The first conduit is fixed to the outer wall of the source chamber shell through the first conduit connector and the second conduit connector.

2. The compensated neutron emitting section of claim 1, wherein, The outer wall of the source chamber shell is provided with a first groove, and the first conduit is arranged in the first groove.

3. The compensated neutron emitting section of claim 2, wherein, The compensated neutron emission short section also includes a second conduit, a third conduit connector and a fourth conduit connector, and the outer wall of the source chamber shell is also provided with a second groove. The second conduit is fixed to the outer wall of the source chamber shell through the third conduit connector and the fourth conduit connector, and the second conduit is arranged in the second groove.

4. The compensated neutron emitting section of claim 3, wherein, The first conduit connector and the third conduit connector are located at the first end of the source chamber housing, and the second conduit connector and the fourth conduit connector are located at the second end of the source chamber housing.

5. The compensated neutron emission subsection according to claim 4, characterized in that, The first conduit connector has an inlet end and an outlet end. The inlet end of the first conduit connector is located outside the source chamber housing, and the outlet end of the first conduit connector extends into the source chamber housing. The second conduit connector has an inlet end and an outlet end. The inlet end of the second conduit connector is located outside the source chamber housing, and the outlet end of the second conduit connector extends into the source chamber housing. The first conduit has a first end and a second end, the first end of the first conduit extends into the inlet end of the first conduit connector, and the second end of the first conduit extends into the inlet end of the second conduit connector.

6. The compensated neutron emission subsection according to claim 5, characterized in that, A sealing ring is provided between the inlet end of the first conduit connector and the first end of the first conduit, and a sealing ring is provided between the inlet end of the second conduit connector and the second end of the first conduit. A sealing ring is provided between the outlet end of the first conduit connector and the outer shell of the source chamber, and a sealing ring is provided between the outlet end of the second conduit connector and the outer shell of the source chamber.

7. The compensated neutron emission subsection according to claim 4, characterized in that, The third conduit connector has an inlet end and an outlet end. The inlet end of the third conduit connector is located outside the source chamber housing, and the outlet end of the third conduit connector extends into the source chamber housing. The fourth conduit connector has an inlet end and an outlet end. The inlet end of the fourth conduit connector is located outside the source chamber housing, and the outlet end of the fourth conduit connector extends into the source chamber housing. The second conduit has a first end and a second end opposite to each other. The first end of the second conduit extends into the inlet end of the third conduit connector, and the second end of the second conduit extends into the inlet end of the fourth conduit connector.

8. The compensated neutron emission subsection according to claim 7, characterized in that, A sealing ring is provided between the inlet end of the third conduit connector and the first end of the second conduit, and a sealing ring is provided between the inlet end of the fourth conduit connector and the second end of the second conduit. A sealing ring is provided between the outlet end of the third conduit connector and the outer shell of the source compartment, and a sealing ring is provided between the outlet end of the fourth conduit connector and the outer shell of the source compartment.

9. The compensated neutron emitting sub-assembly of claim 3, wherein, The first conduit connector, the second conduit connector, the third conduit connector, and the fourth conduit connector are all elbow connectors.

10. The compensated neutron emitting sub-assembly of claim 3, wherein, The first conduit connector, the second conduit connector, the third conduit connector, and the fourth conduit connector are fixed to the outer shell of the source compartment by screws.

11. The compensated neutron emitting sub-assembly of claim 3, wherein, Both the first conduit and the second conduit are made of Inconel 718 alloy.

12. A compensated neutron logging tool, characterized by, Includes electronic circuit short sections, detector short sections, and compensated neutron emission short sections as described in any one of claims 1-11; The electronic circuit section, the detector section, and the compensated neutron emission section are connected in sequence.

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