A gamma ray logging tool

Abstract

The utility model relates to logging instrument technical field, the utility model provides a gamma logging instrument, spacer, spacer sets up inside the outer protective tube, the spacer right -hand member is installed with the inner protective tube, the inner protective tube right -hand member is connected with the shielding pipe left end through screw thread, the shielding pipe inside fixedly connected with the sensor, the sensor surface fixedly connected with the damping cover, the spacer inside left -hand member fixedly connected with the electric connector male, the electric connector male right -hand member is installed with bearing no.

Description

Technical Field

[0001] This utility model relates to the field of logging instrument technology, and in particular to a gamma logging instrument. Background Technology

[0002] Gamma-ray logging is a commonly used geophysical logging method, primarily used to measure the intensity of natural gamma rays in formations. Natural gamma rays are produced by the decay of radioactive elements (such as uranium, thorium, and potassium) in the formation, and their intensity is closely related to factors such as lithology and sedimentary environment. By measuring the intensity of natural gamma rays, information such as lithology, sedimentary environment, and the location of stratigraphic interfaces can be inferred, providing important information for geological exploration and oil and gas extraction.

[0003] Existing multi-directional natural gamma logging instruments with rotating structures are often obstructed during rotation, have poor orientation, are severely affected by external interference, require a non-magnetic environment, and have inaccurate measurement data. They are only suitable for slow longitudinal movement environments during logging while drilling. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this utility model provide a gamma logging tool, which solves the technical problems of existing multi-directional natural gamma logging tools with rotating structures that are often obstructed during rotation, have poor orientation, are severely affected by external interference, require a non-magnetic environment, have inaccurate measurement data, and are only suitable for slow longitudinal movement environments during logging while drilling.

[0005] This utility model is achieved using the following technical solution: a gamma logging tool, including a spacer, which is disposed inside an outer protective tube. An inner protective tube is installed at the right end of the spacer. The right end of the inner protective tube is connected to the left end of a shielding tube by a screw thread. A sensor is fixedly connected inside the shielding tube. A shock-absorbing sleeve is fixedly connected to the surface of the sensor. An electrical connector male is fixedly connected to the left end inside the spacer. A bearing is installed at the right end of the electrical connector male. A rotating shaft tube is installed on the surface of the bearing.

[0006] Through the above technical solution, the spacer sleeve is set inside the outer protective tube, serving to support and fix the internal components, providing a stable structural foundation for the entire instrument, ensuring that each component maintains the correct position in complex downhole environments, and improving the stability and reliability of the instrument. The inner protective tube, in conjunction with the spacer sleeve, further enhances the stability of the instrument's internal structure, protecting internal components from external impacts and wear, and extending the instrument's service life. The sensor is fixedly connected inside the shielding tube, shielding it from external interference, ensuring the sensor can accurately detect gamma rays, and improving the accuracy of measurement data. Simultaneously, the shielding tube and the inner protective tube are connected by screw threads, facilitating installation and disassembly, and simplifying maintenance and replacement. A shock-absorbing sleeve is fixedly connected to the sensor surface, effectively reducing the impact of vibration on the sensor in complex downhole environments, improving sensor stability and measurement accuracy, and ensuring the reliability of data acquisition. The male electrical connector connects to external equipment, enabling signal transmission and power supply, ensuring stable communication between the instrument and the surface control system, and providing power support and data transmission channels for the normal operation of the instrument. Bearing 1 is mounted on the right end of the male connector and works in conjunction with shaft tube 2 to enable relative rotation of the instrument's internal components, improving the instrument's flexibility and adaptability, and facilitating measurements in different downhole orientations. Shaft tube 2, in conjunction with bearing 1, provides support and guidance for the rotation of the instrument's internal components, ensuring the smoothness and accuracy of the rotation process, further enhancing the instrument's measurement performance.

[0007] As a further improvement to the above solution, a counterweight is installed on the right end of the bearing, a circuit board base is installed on the surface of the counterweight, a gamma ray detection component is fixedly connected to the right end of the circuit board base, a gamma ray detection component is fixedly connected to the right end of the gamma ray detection component, a bearing is driven to the right end of the gamma ray detection component, a connecting shaft is driven to the right end of the bearing, a gamma ray detection component is fixedly connected to the right end of the connecting shaft, and a gamma ray detection component is fixedly connected to the right end of the gamma ray detection component.

[0008] Through the above technical solution, counterweight one, installed on the right end of bearing one, balances the instrument's center of gravity, ensuring the instrument maintains the correct posture downhole and improving the stability and reliability of measurement data. Simultaneously, the counterweight one helps reduce instrument swaying during downhole movement, lowering measurement errors. Circuit board holder one is fixedly connected to the surface of counterweight one, providing a mounting position for the circuit board, ensuring its stability and reliability, facilitating connection and signal transmission between the circuit board and gamma-ray detection component one, and improving the overall electrical performance of the system. Gamma-ray detection component one, as one of the instrument's main detection components, can detect gamma rays in the formation from a specific direction, providing fundamental data for generating natural gamma images. Its fixed connection to the right end of circuit board holder one ensures the stability of the detection component and guarantees the accuracy of data acquisition. Gamma-ray detection component two is fixedly connected to gamma-ray detection component one and achieves transmission connection through bearing two, further expanding the instrument's detection direction and range, improving the comprehensiveness and accuracy of data acquisition. This multi-directional detection design helps to more accurately understand the formation structure, providing richer data support for geological analysis. Bearing 2 is installed at the right end of gamma ray detection component 2 and is connected to the connecting shaft for transmission, enabling relative rotation between the detection components. This improves the instrument's flexibility and adaptability, ensuring that the instrument can perform multi-directional gamma ray detection in different downhole environments. The connecting shaft is connected to gamma ray detection component 2 via bearing 2 and is fixedly connected to gamma ray detection component 3, serving both connection and transmission functions. This ensures coordinated operation between the detection components and improves the overall measurement performance of the instrument.

[0009] As a further improvement to the above solution, a counterweight two is fixedly connected to the right end of the gamma ray detection component four, and a circuit board base two is mounted on the surface of the counterweight two.

[0010] Through the above technical solution, counterweight two is installed at the right end of gamma ray detection component four. Working together with counterweight one, it further balances the instrument's center of gravity, ensuring the instrument maintains a stable posture downhole, reducing swaying and offset, and improving the stability and reliability of measurement data. The placement of counterweight two helps improve the instrument's adaptability and measurement accuracy in complex downhole environments. Circuit board holder two is fixedly connected to the surface of counterweight two, providing a mounting position for the circuit board, ensuring its stability and reliability, facilitating the connection and signal transmission between the circuit board and gamma ray detection component four, and improving the overall electrical performance of the system. The placement of circuit board holder two also helps improve the instrument's signal processing capabilities and data transmission stability.

[0011] As a further improvement to the above solution, the right end of the circuit board base two is connected to the bearing three, the surface of the bearing three is mounted with the rotating shaft tube one, and the right end of the rotating shaft tube one is fixedly connected to the female electrical connector.

[0012] Through the above technical solution, bearing three is installed on the right end of circuit board base two and is connected to the rotating shaft tube one for transmission, realizing the relative rotation of the internal components of the instrument and improving the flexibility and adaptability of the instrument. The setting of bearing three ensures that the instrument can operate smoothly in different postures downhole, further improving the accuracy and reliability of measurement data. The rotating shaft tube one cooperates with bearing three to provide support and guidance for the rotation of the internal components of the instrument, ensuring the smoothness and accuracy of the rotation process. The setting of rotating shaft tube one helps to improve the mechanical performance and operational stability of the instrument, and extend the service life of the instrument. The female electrical connector is fixedly connected to the right end of rotating shaft tube one and is used in conjunction with the male electrical connector to realize signal transmission and power supply between the instrument and external equipment. The setting of the female electrical connector ensures stable communication between the instrument and the ground control system, provides power support and data transmission channels for the normal operation of the instrument, and guarantees the reliability and practicality of the instrument.

[0013] The beneficial effects of this utility model are as follows: This utility model features a compact structure and stable connections between components through the rational layout of parts such as spacers, inner protective tubes, and shielding tubes, as well as the orderly installation of components such as bearings, counterweights, and circuit board bases. It can maintain stable operation in complex downhole environments. The sensor surface is fixedly connected with a shock-absorbing sleeve, which can effectively reduce the impact of downhole vibration on the sensor and improve the accuracy and reliability of measurement data. The gamma ray detection components one to four are set up so that the instrument can perform gamma ray detection from multiple directions. Combined with the balancing effect of the counterweight, it ensures that the instrument always maintains the correct posture downhole, thereby obtaining more comprehensive and accurate measurement data. This invention features a counterweight that is always oriented towards the center of gravity. The gamma-ray sensor is shielded by a tube, allowing only four mutually perpendicular windows to detect data. By continuously measuring the natural gamma values ​​in these four directions, and using computer analysis, eight sectors of azimuth gamma are acquired. This generates a natural gamma image along the well axis, revealing the location and trend of the target formation interface, and thus determining the instrument's position and trajectory within the formation. This precise imaging and positioning capability helps to more accurately understand the formation structure, providing crucial information for geological exploration and oil and gas extraction. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0015] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the outer protective tube structure of this utility model; Figure 3 This is a schematic diagram of the structure of the gamma ray detection component of this utility model; Figure 4 This is an enlarged structural diagram of point A in this utility model.

[0016] Explanation of key symbols in the diagram: 1. Spacer sleeve, 2. Inner protective tube, 3. Shielding tube, 4. Shock-absorbing sleeve, 5. Sensor, 6. Male electrical connector, 7. Bearing 1, 8. Counterweight 1, 9. Circuit board base 1, 10. Gamma ray detection component 1, 11. Gamma ray detection component 2, 12. Bearing 2, 13. Connecting shaft, 14. Gamma ray detection component 3, 15. Gamma ray detection component 4, 16. Counterweight 2, 17. Circuit board base 2, 18. Bearing 3, 19. Rotating shaft tube 1, 20. Female electrical connector, 21. Rotating shaft tube 2, 22. Outer protective tube. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0018] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. 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 the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-4 As shown, a gamma logging tool according to an embodiment of the present invention is illustrated, including a spacer 1, which is disposed inside an outer protective tube 22. An inner protective tube 2 is installed at the right end of the spacer 1. The right end of the inner protective tube 2 is connected to the left end of a shielding tube 3 by a screw thread. A sensor 5 is fixedly connected inside the shielding tube 3. A shock-absorbing sleeve 4 is fixedly connected to the surface of the sensor 5. An electrical connector male 6 is fixedly connected to the left end of the spacer 1. A bearing 7 is installed at the right end of the electrical connector male 6. A rotating shaft tube 21 is installed on the surface of the bearing 7.

[0024] A counterweight 8 is installed on the right end of bearing 7. A circuit board base 9 is installed on the surface of the counterweight 8. A gamma ray detection component 10 is fixedly connected to the right end of the circuit board base 9.

[0025] Gamma ray detection component 10 is fixedly connected to gamma ray detection component 2 11 at its right end. Gamma ray detection component 2 11 is connected to bearing 2 12 at its right end via a transmission connection. Bearing 2 12 is connected to connecting shaft 13 at its right end via a transmission connection.

[0026] Gamma ray detection component 3 14 is fixedly connected to the right end of connecting shaft 13, and gamma ray detection component 4 15 is fixedly connected to the right end of gamma ray detection component 3 14.

[0027] The right end of the gamma ray detection component 4 15 is fixedly connected to the counterweight 2 16, and the surface of the counterweight 2 16 is mounted with the circuit board base 2 17.

[0028] The right end of the circuit board base 2 17 is connected to the bearing 3 18, and the bearing 3 18 is mounted on the surface of the rotating shaft tube 1 19.

[0029] The right end of the rotating shaft tube 19 is fixedly connected to the female electrical connector 20.

[0030] After the electrical connector male head 6, bearing 1, counterweight 1, circuit board base 1, gamma ray detection component 1, gamma ray detection component 2, bearing 2, connecting shaft 13, gamma ray detection component 3, gamma ray detection component 4, counterweight 2, circuit board base 2, bearing 3, rotating shaft tube 19, electrical connector female head 20 and rotating shaft tube 21 are installed, they are all inserted into the outer protective tube 22.

[0031] Spacer 1 is installed inside the outer protective tube 22, serving to support and fix the internal components, providing a stable structural foundation for the entire instrument, ensuring that each component maintains the correct position in complex downhole environments, and improving the stability and reliability of the instrument. The inner protective tube 2 works in conjunction with spacer 1 to further enhance the stability of the instrument's internal structure, protecting internal components from external impacts and wear, and extending the instrument's service life. The shielding tube 3 is internally fixedly connected to the sensor 5, shielding it from external interference, ensuring that the sensor 5 can accurately detect gamma rays, and improving the accuracy of measurement data. Simultaneously, the shielding tube 3 and the inner protective tube 2 are connected by screw threads, facilitating installation and disassembly, and simplifying maintenance and replacement. A shock-absorbing sleeve 4 is fixedly connected to the surface of the sensor 5, effectively reducing the impact of vibration on the sensor 5 in complex downhole environments, improving the stability and measurement accuracy of the sensor 5, and ensuring the reliability of data acquisition. The male electrical connector 6 connects to external equipment, enabling signal transmission and power supply, ensuring stable communication between the instrument and the surface control system, and providing power support and data transmission channels for the normal operation of the instrument. Bearing 7 is mounted on the right end of the male connector 6 and works in conjunction with the rotating shaft tube 21 to enable relative rotation of the internal components of the instrument, improving the instrument's flexibility and adaptability, and facilitating measurements in different downhole positions. The rotating shaft tube 21, in conjunction with bearing 7, provides support and guidance for the rotation of the internal components, ensuring the smoothness and accuracy of the rotation process, and further improving the instrument's measurement performance.

[0032] Counterweight 8, mounted on the right end of bearing 7, balances the instrument's center of gravity, ensuring it maintains the correct posture downhole and improving the stability and reliability of measurement data. Simultaneously, counterweight 8 helps reduce instrument swaying during downhole movement, lowering measurement errors. Circuit board holder 9 is fixedly connected to the surface of counterweight 8, providing a mounting position for the circuit board, ensuring its stability and reliability, facilitating connection and signal transmission between the circuit board and gamma-ray detection component 10, and improving the overall system's electrical performance. Gamma-ray detection component 10, as one of the instrument's main detection components, can detect gamma rays in the formation from a specific direction, providing fundamental data for generating natural gamma images. Its fixed connection to the right end of circuit board holder 9 ensures the stability of the detection component and guarantees the accuracy of data acquisition. Gamma-ray detection component 11 is fixedly connected to gamma-ray detection component 10 and connected via bearing 12, further expanding the instrument's detection direction and range, improving the comprehensiveness and accuracy of data acquisition. This multi-directional detection design helps to more accurately understand the formation structure, providing richer data support for geological analysis. Bearing 12 is mounted on the right end of gamma ray detection assembly 11 and is connected to connecting shaft 13 for transmission, enabling relative rotation between the detection assemblies. This improves the instrument's flexibility and adaptability, ensuring it can perform multi-directional gamma ray detection in various downhole environments. Connecting shaft 13 is connected to gamma ray detection assembly 11 via bearing 12 and is fixedly connected to gamma ray detection assembly 14, serving both connection and transmission functions. This ensures coordinated operation between the detection assemblies and improves the overall measurement performance of the instrument.

[0033] Counterweight 2 (16) is installed on the right end of gamma ray detection component 4 (15). Working together with counterweight 1 (8), it further balances the instrument's center of gravity, ensuring a stable posture downhole, reducing swaying and offset, and improving the stability and reliability of measurement data. The placement of counterweight 2 (16) helps improve the instrument's adaptability and measurement accuracy in complex downhole environments. Circuit board holder 2 (17) is fixedly connected to the surface of counterweight 2 (16), providing a mounting position for the circuit board, ensuring its stability and reliability, facilitating connection and signal transmission between the circuit board and gamma ray detection component 4 (15), and improving the overall electrical performance of the system. The placement of circuit board holder 2 (17) helps improve the instrument's signal processing capabilities and data transmission stability.

[0034] Bearing 3 (18) is mounted on the right end of circuit board base 2 (17) and is connected to the rotating shaft tube 1 (19) for transmission, enabling relative rotation of the internal components of the instrument and improving the instrument's flexibility and adaptability. The bearing 3 (18) ensures stable operation of the instrument in different downhole postures, further improving the accuracy and reliability of measurement data. The rotating shaft tube 1 (19), in conjunction with bearing 3 (18), provides support and guidance for the rotation of the internal components, ensuring the smoothness and accuracy of the rotation process. The rotating shaft tube 1 (19) helps improve the instrument's mechanical performance and operational stability, extending its service life. The female electrical connector 20 is fixedly connected to the right end of the rotating shaft tube 1 (19) and is used in conjunction with the male electrical connector 6 to achieve signal transmission and power supply between the instrument and external devices. The female electrical connector 20 ensures stable communication between the instrument and the ground control system, providing power support and data transmission channels for the normal operation of the instrument, guaranteeing its reliability and practicality.

[0035] The implementation principle of a gamma logging tool in this application embodiment is as follows: First, the following components are sequentially installed: male connector 6, bearing 1 7, counterweight 1 8, circuit board base 1 9, gamma ray detection assembly 1 10, gamma ray detection assembly 2 11, bearing 2 12, connecting shaft 13, gamma ray detection assembly 3 14, gamma ray detection assembly 4 15, counterweight 2 16, circuit board base 2 17, bearing 3 18, rotating shaft tube 1 19, female connector 20, and rotating shaft tube 2 21. These components are then inserted into the outer protective tube 22. Next, the assembled gamma logging instrument is lowered to the designated location in the well. After the instrument is lowered, gamma ray detection assemblies 10 to 4 detect natural gamma rays in the formation from different directions. Due to the counterweight, the instrument remains balanced, ensuring the accuracy of the detection direction.

[0036] The gamma-ray data collected by the detection component is transmitted to the ground control system via a circuit board mount and electrical connectors. The design of shielding tube 3 effectively reduces external interference and ensures the stability of data transmission.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A gamma logging tool, characterized in that, Includes a spacer (1), which is set inside the outer protective tube (22). An inner protective tube (2) is installed on the right end of the spacer (1). The right end of the inner protective tube (2) is connected to the left end of the shielding tube (3) by a screw thread. A sensor (5) is fixedly connected inside the shielding tube (3). A shock-absorbing sleeve (4) is fixedly connected to the surface of the sensor (5). An electrical connector male head (6) is fixedly connected to the left end of the spacer (1). A bearing (7) is installed on the right end of the electrical connector male head (6). A rotating shaft tube (21) is installed on the surface of the bearing (7).

2. The gamma logging tool as described in claim 1, characterized in that: A counterweight (8) is installed on the right end of the bearing (7), a circuit board base (9) is installed on the surface of the counterweight (8), and a gamma ray detection component (10) is fixedly connected to the right end of the circuit board base (9).

3. The gamma logging tool as described in claim 2, characterized in that: The right end of the gamma ray detection component one (10) is fixedly connected to the gamma ray detection component two (11), the right end of the gamma ray detection component two (11) is connected to the bearing two (12), and the right end of the bearing two (12) is connected to the connecting shaft (13).

4. A gamma logging tool as described in claim 3, characterized in that: The right end of the connecting shaft (13) is fixedly connected to a gamma ray detection component three (14), and the right end of the gamma ray detection component three (14) is fixedly connected to a gamma ray detection component four (15).

5. A gamma logging tool as described in claim 4, characterized in that: The right end of the gamma ray detection component four (15) is fixedly connected to a counterweight two (16), and a circuit board base two (17) is mounted on the surface of the counterweight two (16).

6. A gamma logging tool as described in claim 5, characterized in that: The right end of the circuit board base 2 (17) is connected to the bearing 3 (18), and the bearing 3 (18) is mounted on the surface of the rotating shaft tube 1 (19).

7. A gamma logging tool as described in claim 6, characterized in that: The right end of the rotating shaft tube (19) is fixedly connected to an electrical connector female head (20).

8. A gamma logging tool as described in claim 1, characterized in that: After the electrical connector male head (6), bearing one (7), counterweight one (8), circuit board base one (9), gamma ray detection component one (10), gamma ray detection component two (11), bearing two (12), connecting shaft (13), gamma ray detection component three (14), gamma ray detection component four (15), counterweight two (16), circuit board base two (17), bearing three (18), rotating shaft tube one (19), electrical connector female head (20) and rotating shaft tube two (21) are installed, they are all installed inside the outer protective tube (22).

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