A type of independent six-arm logging tool suitable for direct-drive wells

Abstract

This invention provides a direct-push independent six-arm caliper logging tool, belonging to the field of oil well logging equipment technology. It includes a housing, six measuring and pushing systems, magnetic elements, an electronic circuit core frame, and a circuit processing system. The housing is cylindrical; all measuring and pushing systems are evenly arranged on the outer circumference of the housing, and all measuring and pushing systems are arranged along the axial direction of the housing; the magnetic elements are fixedly mounted on the rotating ends of the pushing arms; the electronic circuit core frame is fixedly mounted inside the housing; the circuit processing system is located at the vertical position corresponding to the magnetic elements and is fixedly mounted on the electronic circuit core frame. By evenly distributing the six measuring and pushing systems along the circumference of the housing, and staggering each one by a certain distance along the axial direction of the housing, six cross-sectional caliper values ​​can be measured simultaneously to obtain richer and more comprehensive caliper data, improving the accuracy and precision of the measurement.

Description

Technical Field

[0001] This invention relates to the field of oil well logging equipment technology, and more specifically, to a direct-drive independent six-arm caliper logging tool. Background Technology

[0002] Oil well logging is a crucial process in oil exploration and production, and caliper logging is an important component for assessing the characteristics of subsurface reservoirs. Current oil well logging technologies typically employ push-arm combined logging tools. These tools can only open or close their two push arms simultaneously, thus measuring caliper values ​​in only one direction. Because this type of logging tool cannot capture subtle caliper changes in multiple directions, it results in significant measurement errors, making the accuracy and efficiency of push-arm combined logging tools insufficient to meet the demands of modern oil exploration and production.

[0003] Due to the shortcomings of existing technologies, there is an urgent need for a direct-drive independent six-arm logging tool. Summary of the Invention

[0004] The purpose of this invention is to provide a direct-drive independent six-arm logging tool to improve the aforementioned problems. To achieve this purpose, the technical solution adopted by this invention is as follows:

[0005] This application provides a direct-push independent six-arm logging tool, characterized by comprising: a housing, six measurement and pushing systems, a magnetic element, an electronic circuit core frame, and a circuit processing system. The housing is cylindrical; all the measurement and pushing systems are evenly arranged on the outer circumference of the housing, and all the measurement and pushing systems are arranged along the axial direction of the housing. Each pushing system includes a pushing arm and an elastic component. One end of the pushing arm is rotatably connected to the housing, and the other end is slidably connected to the housing. The two ends of the elastic component are respectively fixedly connected to the two ends of the pushing arm. The magnetic element is fixedly disposed at the rotating end of the pushing arm. The electronic circuit core frame is fixedly disposed inside the housing. The circuit processing system is disposed at a vertical position corresponding to the magnetic element and is fixedly disposed on the electronic circuit core frame.

[0006] Furthermore, the outer circumference of the housing may be uniformly provided with six grooves that cooperate with the measuring and pushing system, and the measuring and pushing system is disposed in the grooves.

[0007] Furthermore, the housing includes a hollow tube, two protective caps and two protective plugs. The two protective caps are disposed at both ends of the housing, the two protective plugs are disposed inside the hollow tube, and the electronic circuit core frame is fixedly disposed between the two protective plugs.

[0008] Furthermore, the point on the housing axis that is vertically projected onto the rotating end of the push arm is designated as the positioning point, and the positioning points formed by the projections of any two push arms do not coincide.

[0009] Furthermore, the electronic circuit core frame includes a cylindrical support and six mounting plates. The cylindrical support is fixedly installed inside the hollow tube and is coaxially arranged with the hollow tube. The six mounting plates are fixedly installed on the circumference of the cylindrical support, and the position of each mounting plate corresponds to the position of the rotating end of the measuring push system.

[0010] Furthermore, the circuit processing system includes a rotation angle measuring circuit board, a power supply module, a data processing module, and at least two sensor chips. The rotation angle measuring circuit board is arranged parallel to the plane of rotation of the magnetic element and is fixedly mounted on the electronic circuit core frame. All the sensor chips are fixedly mounted on the surface of the rotation angle measuring circuit board, and the rotation angle measuring circuit board, the power supply module, the data processing module, and the sensor chips are electrically connected.

[0011] Furthermore, the number of sensor chips is four, and all the sensor chips are arranged in an arc shape. The center of the arc formed by all the sensor chips is the rotation center point of the measurement and pushing system.

[0012] Furthermore, the distance between adjacent sensor chips is equal.

[0013] Furthermore, the angle formed by the lines connecting any two adjacent centers of the sensor chips and the rotation center point of the measurement push system is 20°.

[0014] Furthermore, the rotation angle of the measuring push system is 50°.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention improves the accuracy and precision of measurements by uniformly distributing six measuring push systems along the circumference of the housing and staggering each one by a certain distance along the axial direction of the housing, thereby simultaneously measuring the well diameter values ​​of six sections. This allows for richer and more comprehensive well diameter data. Furthermore, by integrating the measuring elements with the measuring rod and installing the measuring circuit board at the corresponding position of the measuring elements, the structure of the instrument is simplified, the complex connections between components are reduced, making it more suitable for confined spaces and improving the reliability of the instrument.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the direct-drive independent six-arm logging tool.

[0020] Figure 2 This is a top view of the tool applicable to the direct-drive independent six-arm logging tool;

[0021] Figure 3 for Figure 1 Enlarged view at point I in the image;

[0022] Figure 4 This is a schematic diagram of the circuit processing system.

[0023] The diagram shows the following components: 1. Housing; 11. Hollow tube; 12. Protective cap; 13. Protective plug; 2. Measuring push system; 21. Elastic component; 22. Push arm; 3. Magnetic element; 4. Electronic circuit core frame; 41. Cylindrical bracket; 42. Mounting plate; 5. Circuit processing system; 51. Rotation angle measuring circuit board; 52. Power module; 53. Data processing module; 54. Sensor chip. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a direct-push independent six-arm caliper logging tool, characterized by comprising: a housing 1, six measuring push systems 2, magnetic components 3, an electronic circuit core frame 4, and a circuit processing system 5. The housing 1 is cylindrical. This shape facilitates instrument insertion and operation while providing sufficient space to accommodate other key components. All measuring push systems 2 are evenly arranged on the outer circumference of the housing 1, and all measuring push systems 2 are arranged along the axial direction of the housing 1. Traditional logging tools often can only measure the caliper value in one direction, while the six measuring push systems 2 of this invention allow simultaneous measurement of the caliper value of six different cross-sections. This layout provides more comprehensive data, enabling engineers to better understand the well conditions, including possible anisotropy. This multi-directional measurement capability significantly improves measurement accuracy and data reliability. The push system includes push arms 22 and elastic components 21. One end of the push arm 22 is rotatably connected to the housing 1, and the other end is slidably connected to the housing 1. The two ends of the elastic component 21 are respectively fixedly connected to the two ends of the push arm 22. This design allows the push arm 22 to adhere tightly to the wellbore wall as the logging tool descends or ascends, ensuring measurement stability. Simultaneously, the elastic component 21 provides retraction power, enabling the push arm 22 to adapt to wells of different diameters. A magnetic element 3 is fixedly mounted at the rotating end of the push arm 22. By integrating the measuring element with the measuring rod, the device mechanism is simplified. The magnetic element 3 cooperates with the electronic circuit core frame 4 to provide the basic data for angle measurement. The electronic circuit core frame 4 is fixedly mounted inside the housing 1. The circuit processing system 5 is located at the vertical position corresponding to the magnetic element 3 and is fixedly mounted on the electronic circuit core frame 4. The function of the circuit processing system 5 is to acquire, process, and calculate the data obtained from the sensor, and then transmit the results to the surface system.

[0027] Preferably, such as Figure 1 As shown, the outer circumference of the housing 1 is uniformly provided with six grooves that mate with the measuring push system 2, and the measuring push system 2 is disposed within the grooves. Grooves are introduced in this embodiment to better accommodate and accommodate the measuring push system 2. The introduction of grooves also facilitates the positioning and fixation of the measuring push system 2, thereby reducing errors that may be caused by external environment or instrument vibration.

[0028] Preferably, such as Figure 2 As shown, the housing 1 includes a hollow tube 11, two protective caps 12, and two protective plugs 13. The two protective caps 12 are located at both ends of the housing 1, providing external protection for the entire instrument while allowing other components to be installed and operated inside. The two protective plugs 13 are located inside the hollow tube 11, and the electronic circuit core frame 4 is fixedly positioned between the two protective plugs 13. The caps provide additional protection during instrument transportation and operation, preventing objects from entering the housing 1 and damaging internal components. The electronic circuit core frame 4 is installed between the two protective plugs 13, a position that ensures the secure fixation of the electronic circuit board and components inside the instrument.

[0029] Preferably, the point on the axis of the housing 1 where the rotating end of the push arm 22 is vertically projected is taken as the positioning point, and the positioning points formed by the projections of any two push arms 22 do not coincide. The purpose of this design is to make each measuring push system 2 axially offset from each other by a certain distance. Since the magnetic core chip in each push arm 22 corresponds to a circuit processing system 5, the offset arrangement of these components can reduce the internal diameter of the housing 1, achieving a more optimized mounting structure. The offset installation can also help avoid interference between the magnetic core chip and the circuit processing system 5. In the instrument, electronic components may affect each other, so offsetting them can reduce electromagnetic interference, thereby ensuring the accuracy and stability of the measurement. This offset mounting structure also helps to optimize the circuit layout. Furthermore, each magnetic core chip is more tightly integrated with its corresponding circuit processing system 5, making it easier to design circuit connections and wiring, thereby improving the efficiency and reliability of the circuit.

[0030] Preferably, such as Figure 3 As shown, the electronic circuit core frame 4 includes a cylindrical bracket 41 and six mounting plates 42. The cylindrical bracket 41 is fixedly mounted inside the hollow tube 11 and is coaxially arranged with the hollow tube 11. The introduction of the cylindrical bracket 41 allows the electronic circuit core frame 4 to be tightly fixed inside the hollow tube 11, achieving better space utilization. By fixing the six mounting plates 42 to the circumference of the cylindrical bracket 41 and ensuring that they correspond to the rotating end positions of the measuring push system 2, the installation process of the entire system can be simplified. This design also helps to improve the maintainability of the system. Due to the clearer and more uniform layout of the various components, operators can more easily access and maintain the electronic circuit core frame 4, including replacing or repairing electronic components, which helps to reduce maintenance costs.

[0031] Preferably, such as Figure 3 and Figure 4As shown, the circuit processing system 5 includes a rotation angle measuring circuit board 51, a power supply module 52, a data processing module 53, and at least two sensor chips 54. The rotation angle measuring circuit board 51 is arranged parallel to the plane of rotation of the magnetic element 3 and is fixedly mounted on the electronic circuit core frame 4. All sensor chips 54 are fixedly mounted on the surface of the rotation angle measuring circuit board. The rotation angle measuring circuit board 51, power supply module 52, data processing module 53, and sensor chips 54 are electrically connected. The combined use of multiple sensor chips 54 can provide more data points, which helps to improve the stability and accuracy of the measurement. The data processing module 53 can process and calculate these data to obtain the wellbore measurement value. The introduction of the power supply module 52 helps to ensure that the system can obtain a stable power supply during downhole operation.

[0032] Furthermore, this application discloses a method for processing the output signals of sensor chip 54, including: measuring and recording the amplitude of the output signal of each sensor chip 54; analyzing the logical relationship of the output signals of multiple sensor chips 54 to determine which two sensor chips 54 the magnetic field direction of the magnetic element 3 points to; after determining the range of sensor chips 54 the magnetic field direction of the magnetic element 3 points to, calculating the rotation angle of the magnetic element 3 within that range based on the amplitude of the output signals of the two sensor chips 54; calculating the total rotation angle of the magnetic element 3 based on the rotation angle and offset of each range; and finally, calculating the well diameter measurement value based on the total rotation angle of the magnetic element 3 using trigonometric functions.

[0033] Preferably, there are four sensor chips 54, all arranged in an arc shape, with the center of the arc formed by all the sensor chips 54 serving as the rotation center point of the measuring push system 2. The arc arrangement of the sensor chips 54 allows multiple sensors to simultaneously measure the position of the magnetic element 3, thereby improving measurement accuracy. Using four sensor chips 54 arranged in an arc shape enables omnidirectional measurement coverage; regardless of the rotation position of the measuring push system 2, at least one sensor is in the optimal measurement position. This ensures comprehensive measurement without blind spots, thus improving measurement accuracy.

[0034] Preferably, the distance between adjacent sensor chips 54 is equal. Equal sensor spacing simplifies data processing and makes it easier to calibrate and integrate measurement data. This design reduces the complexity of data processing and helps improve measurement accuracy.

[0035] Preferably, the angle formed by the lines connecting any two adjacent sensor chip 54 centers to the rotation center of the measurement push system 2 is 20°. This 20° angle provides sufficiently high resolution to detect minute wellbore changes, ensuring the logging tool provides high-precision, uniformly covered measurement results during oil well logging.

[0036] Preferably, the rotation angle of the measuring push system 2 is 50°. The 50° rotation angle ensures that the system can measure the wellbore diameter at different depths and in different directions, thereby improving the comprehensiveness of the data.

[0037] Furthermore, this application also discloses a wellbore detection method applicable to a direct-drive independent six-arm wellbore logging tool, comprising:

[0038] The invention's direct-push independent six-arm caliper logging tool is installed at the wellhead and inserted into the well. When the instrument is in the well, the outer edge of the measuring push system 2 is pressed against the well wall by the elastic component 21. This ensures close contact between the instrument and the well wall for accurate caliper measurement. During logging, the instrument is lifted or pushed down to cover the desired logging area. During this process, the measuring push system 2 is subjected to radial force, causing rotation and sliding at both ends of the push arm 22. This action allows the instrument to cover well sections of different depths, thus achieving comprehensive caliper measurement. The magnetic element 3 mounted on the push arm 22 also rotates with the movement of the push arm 22. At the vertical position of the magnetic element 3, the electronic circuit core frame 4 contains sensor chips 54 for detecting the rotation signal of the magnetic element 3. These sensor chips 54 can accurately measure the rotation angle of the magnetic element 3. Next, the data detected by the sensors is processed by a data processing circuit board. This data includes information such as the position of the measuring push system 2 and the diameter of the well wall. The processed data is transmitted to the surface system for further analysis and recording. Using the processed data, the surface system can perform wellbore calibration and measurements.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A logging tool suitable for direct-drive independent six-arm caliper logging, characterized in that, include: The shell (1) is cylindrical; Six measuring push systems (2) are evenly arranged on the outer circle of the housing (1). All the measuring push systems (2) are arranged along the axial direction of the housing (1). The push system includes a push arm (22) and an elastic component (21). One end of the push arm (22) is rotatably connected to the housing (1), and the other end is slidably connected to the housing (1). The two ends of the elastic component (21) are fixedly connected to the two ends of the push arm (22). Magnetic element (3), the magnetic element (3) is fixedly disposed at the rotating end of the push arm (22); Electronic circuit core frame (4), the electronic circuit core frame (4) is fixedly installed inside the housing (1); as well as The circuit processing system (5) is disposed at the vertical position corresponding to the magnetic element (3) and is fixedly disposed on the electronic circuit core frame (4). The outer circumference of the housing (1) is uniformly provided with six grooves that cooperate with the measuring push system (2), and the measuring push system (2) is disposed in the grooves; The point on the axis of the housing (1) where the rotating end of the push arm (22) is vertically projected is the positioning point, and the positioning points formed by the projections of any two push arms (22) do not coincide.

2. The logging tool for direct-drive independent six-arm boreholes according to claim 1, characterized in that: The housing (1) includes a hollow tube (11), two protective caps (12) and two protective plugs (13). The two protective caps (12) are disposed at both ends of the housing (1), and the two protective plugs (13) are disposed inside the hollow tube (11). The electronic circuit core frame (4) is fixedly disposed between the two protective plugs (13).

3. The logging tool for direct-drive independent six-arm boreholes according to claim 1, characterized in that: The electronic circuit core frame (4) includes a cylindrical support (41) and six mounting plates (42). The cylindrical support (41) is fixedly installed inside the hollow tube (11) and is coaxially arranged with the hollow tube (11). The six mounting plates (42) are fixedly installed on the circumference of the cylindrical support (41), and the position of each mounting plate (42) corresponds to the position of the rotating end of the measuring push system (2).

4. The logging tool for direct-drive independent six-arm boreholes according to claim 3, characterized in that: The circuit processing system (5) includes a rotation angle measuring circuit board (51), a power supply module (52), a data processing module (53), and at least two sensor chips (54). The rotation angle measuring circuit board (51) is arranged parallel to the plane of the rotational movement of the magnetic element (3). The rotation angle measuring circuit board (51) is fixedly mounted on the electronic circuit core frame (4). All the sensor chips (54) are fixedly mounted on the surface of the rotation angle measuring circuit board (51). The rotation angle measuring circuit board (51), the power supply module (52), the data processing module (53), and the sensor chips (54) are electrically connected.

5. The logging tool for direct-drive independent six-arm boreholes according to claim 4, characterized in that: The number of sensor chips (54) is 4. All the sensor chips (54) are arranged in an arc shape. The center of the arc formed by all the sensor chips (54) is the rotation center point of the measurement push system (2).

6. The logging tool for direct-drive independent six-arm boreholes according to claim 5, characterized in that: The distance between adjacent sensor chips (54) is equal.

7. The logging tool for direct-drive independent six-arm boreholes according to claim 6, characterized in that: The angle formed by the lines connecting any two adjacent centers of the sensor chips (54) and the rotation center of the measurement push system (2) is 20°.

8. The logging tool for direct-drive independent six-arm boreholes according to claim 7, characterized in that: The rotation angle of the measuring push system (2) is 50°.

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