Portable wellhead automatic detection tool for fatigue state of outer thread of large drill string in deep well

Abstract

The application discloses a portable wellhead automatic detection tool for fatigue state of outer thread of large drill pipe in deep well, and relates to the technical field of detection of outer thread of oil drill pipe. The portable wellhead automatic detection tool for fatigue state of outer thread of large drill pipe in deep well comprises a conical disc, a linear driving part, a transmission part, a plurality of sensing assemblies and a positioning part. The conical disc comprises a conical cylinder and at least one variable-diameter rotating ring, the at least one variable-diameter rotating ring is arranged in a concentric manner and is attached to the bottom surface and / or the top surface of the conical cylinder and can rotate relative to the conical cylinder. The transmission part comprises a plurality of guide rods and a push disc. The plurality of sensing assemblies are respectively connected to the first ends of the plurality of guide rods. The first end of the positioning part is connected to the conical cylinder, and the second end of the positioning part has an elastic telescopic structure, which is used for extending into a water eye of a drill pipe and being positioned by being tightly expanded against the inner wall of the water eye of the drill pipe, so that the positioning part is coaxial with the water eye of the drill pipe. The problem that the outer thread detection device in the prior art can only detect the outer thread of a single size specification of a drill pipe, lacks flexibility and universality and reduces detection efficiency is solved.

Description

Technical Field

[0001] This application relates to the field of oil drill pipe external thread inspection technology, and in particular to a portable automatic wellhead inspection tool for the fatigue condition of external threads on large deep well drilling tools. Background Technology

[0002] Oilfield drilling tools play a crucial role in exploration and development, especially during deep or ultra-deep well drilling operations. Environmental factors such as high temperature, high pressure, and complex formations exacerbate fatigue damage to the external threads of drilling tools, making them prone to fatigue cracks, wear, and corrosion. In severe cases, this can lead to drill string breakage, resulting in significant economic losses and safety hazards. Therefore, it is essential to monitor the fatigue condition of the external threads of drilling tools to enable timely detection and preventative measures, thereby reducing the occurrence of accidents.

[0003] Existing technology provides external thread inspection devices that can only inspect the external threads of drill bits of a single size, which lacks flexibility and versatility, increases the cost of inspecting external threads of drill bits of different sizes, and reduces inspection efficiency.

[0004] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools, in order to solve the problem that the external thread inspection devices provided by the prior art can only inspect the external threads of drilling tools of a single size specification, which lacks flexibility and versatility, increases the cost of inspecting the external threads of drilling tools of different sizes, and reduces the inspection efficiency.

[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0007] This application provides a portable automatic wellhead inspection tool for fatigue condition of external threads on large deep well drilling tools, including:

[0008] A conical disc includes a conical cylinder and at least one variable diameter rotating ring. The at least one variable diameter rotating ring is concentrically arranged to fit against the bottom surface and / or top surface of the conical cylinder and can rotate relative to the conical cylinder. A portion of the edge of the variable diameter rotating ring protrudes from the side surface of the conical cylinder, and a plurality of through displacement grooves are provided along the circumferential direction on the portion of the edge. The displacement grooves are arc-shaped, and the first end of the displacement groove is closer to the center of the variable diameter rotating ring than the second end.

[0009] A linear drive unit is installed inside the cone, with the drive end extending from the center of the top surface of the cone and extending along the axis of the cone;

[0010] The transmission part includes multiple guide rods and a push plate. The center of the push plate is connected to the drive end. Multiple first mounting grooves are opened around the edge of the push plate. The multiple first mounting grooves are respectively opposite to multiple displacement grooves. The first ends of the multiple guide rods pass through the multiple displacement grooves respectively. The second ends of the guide rods are slidably connected to the first mounting grooves opposite to the displacement grooves, and the sliding direction is the radial direction of the push plate. The guide rods are parallel to the generatrix of the side of the cone.

[0011] Multiple sensing components are connected to the first end of multiple guide rods, respectively;

[0012] The positioning part is coaxially arranged with the cone and located on one side of the bottom surface of the cone. The first end of the positioning part is connected to the cone, and the second end of the positioning part has an elastic telescopic structure. The elastic telescopic structure can extend and retract along the axial direction of the positioning part. The elastic telescopic structure is used to extend into the water hole of the drill bit and tighten and position itself with the inner wall of the water hole of the drill bit, so that the positioning part is coaxial with the water hole of the drill bit.

[0013] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition includes a variable diameter swivel ring comprising a first variable diameter swivel ring and a second variable diameter swivel ring. The first variable diameter swivel ring is located on one side of the bottom surface of the cone, and the second variable diameter swivel ring is located on one side of the top surface of the cone. The outer diameter of the first variable diameter swivel ring is larger than the outer diameter of the second variable diameter swivel ring. The first displacement groove of the first variable diameter swivel ring is opposite to the second displacement groove of the second variable diameter swivel ring. The line connecting the relative positions of the first displacement groove and the second displacement groove is parallel to the generatrix on the side of the cone. The first end of the guide rod passes through the first displacement groove and the second displacement groove, respectively.

[0014] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition further includes: a plurality of first connectors, each of which is cylindrical in shape and has grooves on its sides, one end of each of the plurality of first connectors being connected to the second end of a plurality of guide rods, and the grooves of the plurality of first connectors being slidably connected to a plurality of first mounting slots, with the sliding direction being radial to the push plate.

[0015] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition includes a sensing component comprising a connecting seat, a mounting seat, and a sensor. The connecting seat is fitted with the first end of a connecting guide rod, the mounting seat is connected to the side of the connecting seat facing the axis of the cone, and the side of the mounting seat facing away from the connecting seat has a first accommodating space, in which the sensor is accommodated.

[0016] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition includes a positioning part comprising a positioning cylinder. The first end of the positioning cylinder is connected to a cone cylinder, and the second end of the positioning cylinder is provided with a through groove corresponding to the elastic telescopic structure. The through groove is used to extend the positioning cylinder when the elastic telescopic structure is tightened so as to tighten and position it against the inner wall of the drill string's water hole. The positioning cylinder has a step protruding from its first end near itself. The step is spaced apart from the bottom surface of the cone cylinder and forms a second accommodating space. The second accommodating space is used to accommodate a variable diameter rotating ring located on one side of the bottom surface of the cone cylinder.

[0017] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition includes a positioning end cap and a locking assembly in the positioning part. The elastic telescopic structure includes a connecting rod assembly, a pressure plate, and a compression spring. The positioning end cap covers the second end of the positioning cylinder, and a through hole is provided in the center of the positioning end cap. The first end of the locking assembly is engaged with the through hole, and the second end of the locking assembly has a limiting plate disposed inside the positioning cylinder. The pressure plate is disposed on the side of the limiting plate away from the cone cylinder. The two ends of the compression spring are respectively connected to the pressure plate and the limiting plate, and the two ends of the connecting rod assembly are respectively... The second end connects the pressure plate and the positioning cylinder; wherein, the compression spring has a preload force to cause the pressure plate to push the connecting rod assembly to retract along the axial direction of the positioning cylinder to extend at least partially out of the through groove. When the positioning part extends into the drill bit water hole, the connecting rod assembly is pushed against the inner wall of the drill bit water hole and extends along the axial direction of the positioning cylinder and retracts into the positioning cylinder along the through groove, causing the pressure plate to move toward the limiting plate. The compression spring generates a rebound force, which pushes the pressure plate away from the limiting plate under the action of the rebound force, so that the connecting rod assembly extends at least partially out of the positioning cylinder along the through groove and is tightened and positioned with the inner wall of the drill bit water hole.

[0018] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead detection of external thread fatigue state includes a cone cylinder with multiple second mounting slots corresponding to the first mounting slots around its side, and multiple guide rods with their first ends passing through multiple displacement slots and multiple first mounting slots.

[0019] The portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition also includes a second connector that is slidably connected to the first end of the guide rod. The second connector is slidably connected to the second mounting groove, and the second connector can reciprocate the first end of the guide rod in the second mounting groove along the radial direction of the cone.

[0020] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition further includes: a control unit, which is spaced apart on the side of the pusher plate away from the cone plate; two tubes are provided between the control unit and the linear drive unit; a first signal line is provided inside the tubes; and the two ends of the first signal line are respectively connected to the control unit and the linear drive unit.

[0021] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition includes a hollow guide rod with a second signal line. The two ends of the second signal line are connected to a sensing component and a control unit, respectively, so that the control unit can acquire the data collected by the sensing component.

[0022] In some embodiments, the aforementioned portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition further includes: at least one rotating handle, wherein the at least one rotating handle is respectively connected to the edges of the first variable diameter swivel and the second variable diameter swivel.

[0023] Through the above technical solution, the portable deep well drilling tool for automatic wellhead inspection of external thread fatigue condition has at least the following advantages:

[0024] This application provides a portable automatic wellhead inspection tool for fatigue condition of external threads on large deep well drilling tools. By setting a variable-diameter rotating ring in a cone disc, and through a through-hole arc-shaped displacement groove on the rotating ring, the first end of a guide rod passes through the displacement groove, and the second end of the guide rod slides radially along the pusher disc with a first mounting groove on the pusher disc. This allows the guide rod to maintain parallelism with the cone cylinder axis while adjusting the distance between the cone cylinder axis at the first and second ends of the displacement groove. Consequently, the sensing component connected to the first end of the guide rod can be adapted to inspect external threads of different sizes of drilling tools involved in deep or ultra-deep well drilling operations, improving the flexibility and versatility of the inspection tool. Furthermore, it eliminates the need for multiple inspection tools to inspect different sizes of external threads, reducing costs. Operators can easily adjust the inspection tool to meet the inspection needs of different sizes of external threads, improving inspection efficiency. Before testing, the guide rod is positioned in different locations in the displacement groove by rotating the variable diameter swivel relative to the cone cylinder. This adjusts the guide rod to match the external thread size on the inner side of the cone cylinder axis. The positioning part, with its elastic telescopic structure, extends into the drill string's water eye and tightens against the inner wall of the water eye, ensuring coaxiality between the positioning part and the water eye and guaranteeing the accuracy of the test results. During testing, the guide rod slides relative to the first mounting groove and the displacement groove under the action of the push plate. This causes the sensing component at the first end of the guide rod to be actuated, forming a test trajectory parallel to the side of the cone cylinder. This ensures that the sensor maintains the same distance from the measured external thread surface for data acquisition. This application solves the problem that existing external thread testing devices can only test drill string external threads of a single size, lacking flexibility and versatility, increasing the cost of testing external threads of different sizes, and reducing testing efficiency.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 The prior art method related to the embodiments of this application - drill string external thread stress detection device (CN106290555A) is illustrated schematically.

[0028] Figure 2 The diagram illustrates an isometric view of a portable automatic wellhead detection tool for external thread fatigue state of a large deep well drilling tool provided in an embodiment of this application.

[0029] Figure 3 The illustration shows a partial cross-sectional view of a portable automatic wellhead detection tool for external thread fatigue state of a large deep well drilling tool provided in an embodiment of this application.

[0030] Figure 4 This illustration schematically shows a partial isometric structural diagram of a portable deep well drilling tool external thread fatigue state automatic wellhead detection tool provided in an embodiment of this application;

[0031] Figure 5 This illustration schematically shows another partial isometric structural diagram of a portable deep well drilling tool external thread fatigue state automatic wellhead detection tool provided in an embodiment of this application;

[0032] Figure 6 The diagram schematically illustrates a partial isometric view of the first connector of a portable deep well drilling tool external thread fatigue state automatic wellhead detection tool provided in an embodiment of this application;

[0033] Figure 7 The diagram illustrates the isometric structure of the sensing component of a portable deep well drilling tool external thread fatigue state automatic wellhead detection tool provided in an embodiment of this application.

[0034] Figure 8 The diagram illustrates the isometric structure of the positioning part of a portable deep well drilling tool external thread fatigue state automatic wellhead detection tool provided in an embodiment of this application.

[0035] Figure 9 The diagram illustrates, schematically, the explosive isometric view of the positioning part of a portable deep well drilling tool for automatic wellhead detection of external thread fatigue state, according to an embodiment of this application.

[0036] Figure 10 The diagram illustrates the isometric structure of the cone cylinder of a portable deep well drilling tool's external thread fatigue state automatic wellhead detection tool provided in this application embodiment.

[0037] Explanation of icon numbers

[0038] 1. Conical disc; 11. Conical cylinder; 12. Variable diameter swivel; 111. Bottom surface; 112. Top surface; 113. Second mounting groove; 121. First variable diameter swivel; 122. Second variable diameter swivel; 123. Displacement groove; 1211. First displacement groove; 1221. Second displacement groove;

[0039] 2. Linear drive unit;

[0040] 3. Transmission unit; 31. Guide rod; 32. Push plate; 321. First mounting slot;

[0041] 4. Sensing component; 41. Connector; 42. Mounting base; 421. First receiving space;

[0042] 5. Positioning part; 51. Elastic telescopic structure; 52. Positioning cylinder; 53. Positioning end cover; 54. Locking assembly; 511. Linkage assembly; 512. Pressure plate; 513. Compression spring; 521. Through groove; 522. Step; 541. Limiting plate; 5221. Second accommodating space;

[0043] 6. First connector; 61. Groove; 7. Second connector; 8. Control unit; 9. Tube body; 10. Rotating handle. Detailed Implementation

[0044] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0045] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0046] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0048] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0049] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0050] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0051] like Figure 1The image shows a prior art device for detecting external threads of drill bits - a stress detection device for external threads of drill bits (publication number CN106290555A, publication date January 4, 2017). The main advantages of this device compared to the prior art are that it adds an elastic telescopic mechanism and a diameter-changing mechanism. The elastic telescopic structure is used to extend into the water hole of the drill bit and tighten and position it with the inner wall of the water hole, so that the positioning part is coaxial with the water hole of the drill bit. The diameter-changing mechanism can meet the detection requirements of the device for external threads of drill bits of different sizes.

[0052] like Figures 2 to 5 As shown, this application provides a portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools, including a cone disc 1, a linear drive unit 2, a transmission unit 3, multiple sensing components 4, and a positioning unit 5; the cone disc 1 includes a cone cylinder 11 and at least one variable diameter rotating ring 12, the at least one variable diameter rotating ring 12 is concentrically arranged to fit against the bottom surface 111 and / or the top surface 112 of the cone cylinder 11 and can rotate relative to the cone cylinder 11, a portion of the edge of the variable diameter rotating ring 12 protrudes from the side of the cone cylinder 11, and multiple through displacement grooves 123 are provided along the circumferential direction on the portion of the edge, the displacement grooves 123 are arc-shaped, and the first end of the displacement groove 123 is closer to the center of the variable diameter rotating ring 12 than the second end; the linear drive unit 2 is disposed inside the cone cylinder 11, the drive end extends out from the center of the top surface 112 of the cone cylinder 11 and extends along the axis of the cone cylinder 11; the transmission unit 3 includes multiple guide rods 31 and a pusher 32, the center of the pusher 32 being closer to the drive end The push plate 32 has multiple first mounting grooves 321 around its edge, which are respectively opposite to multiple displacement grooves 123. The first ends of multiple guide rods 31 pass through the multiple displacement grooves 123, and the second ends of the guide rods 31 are slidably connected to the first mounting grooves 321 opposite to the displacement grooves 123, with the sliding direction being radial to the push plate 32. The guide rods 31 are parallel to the generatrix of the side of the cone 11. Multiple sensing components 4 are respectively connected to the first ends of the multiple guide rods 31. The positioning part 5 is coaxially arranged with the cone 11 and located on one side of the bottom surface 111 of the cone 11. The first end of the positioning part 5 is connected to the cone 11, and the second end of the positioning part 5 has an elastic telescopic structure 51. The elastic telescopic structure 51 can extend and retract along the axial direction of the positioning part 5. The elastic telescopic structure 51 is used to extend into the water hole of the drill bit and tighten and position itself with the inner wall of the water hole of the drill bit, so that the positioning part 5 is coaxial with the water hole of the drill bit.

[0053] Specifically, the portable automatic wellhead inspection tool for the fatigue state of external threads of deep well drilling tools provided in this application can inspect the fatigue state of external threads of drilling tools during drilling operations in deep or ultra-deep wells. It is equipped with a conical disc 1, which has a preset taper. The preset taper matches the taper of the external conical surface of the external thread of the drilling tool to be measured. The conical disc 1 includes a conical cylinder 11 and at least one variable-diameter rotating ring 12. The sides of the conical cylinder 11 and the at least one variable-diameter rotating ring 12 also have preset tapers. The conical cylinder 11 with the preset taper has a bottom surface 111 and a top surface 112. The bottom surface 111 is the end of the conical cylinder 11 with the larger outer diameter, and the top surface 112 is the end of the conical cylinder 11 with the smaller outer diameter.

[0054] This application includes at least one variable-diameter rotating ring 12. There can be one, two, or more variable-diameter rotating rings 12; the specific number is not limited. When there are two or more variable-diameter rotating rings 12, the line connecting the relative positions of the displacement grooves 123 of the two or more variable-diameter rotating rings 12 must be parallel to the generatrix of the side of the cone 11. This allows the guide rod 31 to be simultaneously limited and guided by the two or more displacement grooves 123, ensuring the stability of the guide rod 31's position change. Furthermore, when there are two or more variable-diameter rotating rings 12, they must be driven simultaneously to achieve synchronous rotation, ensuring that the relative positions of the two or more displacement grooves 123 remain unchanged and that the line connecting their relative positions is always parallel to the generatrix of the side of the cone 11. Simultaneous driving of the two or more variable-diameter rotating rings 12 can be achieved by using handles, pull rings, etc., which are not specifically limited.

[0055] A portion of the edge of the variable diameter swivel 12 protrudes from the side of the cone 11, and multiple through-grooves 123 are provided along the circumferential direction of this portion of the edge to provide space for the first end of the guide rod 31 to pass through. The first end of the through-grooves 123 is closer to the center of the variable diameter swivel 12 than the second end. That is, when the first end of the guide rod 31 is at the second end of the variable diameter swivel 12, its distance relative to the axis of the cone 11 is greater than the distance relative to the axis of the cone 11 when the first end of the guide rod 31 is at the first end of the variable diameter swivel 12. The second end of the guide rod 31 slides along the radial direction of the push plate 32 with the first mounting groove 321 on the push plate 32. The guide rod 31 can maintain parallelism with the generatrix on the side of the cone 11 while adjusting the distance between the axes of the cone 11 at the first and second ends of the displacement groove 123. This allows the sensing component 4 connected to the first end of the guide rod 31 to be adapted to perform inspection operations on external threads of drill bits of different sizes involved in deep or ultra-deep well drilling operations, improving the flexibility and versatility of the inspection tool. At the same time, it eliminates the need to configure multiple inspection tools for different sizes of external threads of drill bits, reducing costs. Operators can easily adjust the inspection tools to meet the inspection needs of external threads of drill bits of different sizes, improving inspection efficiency. The operation of driving the variable diameter swivel ring 12 to rotate relative to the cone cylinder 11 can be achieved by manually driving the handle, pull ring and other components set on the variable diameter swivel ring 12. This operation is performed before the linear drive unit 2 drives the push plate 32 to move linearly, so that the detection tool matches the outer conical surface of the drill bit's external thread. Then, the push plate 32 pushes the guide rod 31 to move, thereby driving the sensing component 4 at the first end of the guide rod 31 to form a detection trajectory parallel to the side of the cone cylinder 11, so as to always maintain the same distance from the measured external thread surface for the acquisition of detection data.

[0056] To enable the linear drive unit 2 to drive the push plate 32 to perform linear motion, in one embodiment, the linear drive unit 2 may include a linear motor and a drive rod. The linear motor is disposed inside the cone 11, and the top surface 112 of the cone 11 has a central opening to allow the drive rod to extend along the axis of the cone 11 and connect with the push plate 32, so that the drive rod can transmit the driving force of the linear motor to drive the push plate 32 to perform linear motion. In another embodiment, the linear drive unit 2 may include a stepper motor, a lead screw, and a nut. The stepper motor is disposed inside the cone 11, and the top surface 112 of the cone 11 has a central opening to allow the lead screw to extend along the axis of the cone 11. The center of the push plate 32 is connected to the nut and sleeved on the lead screw, which can also drive the linear motion of the push plate 32. The specific form of the linear drive unit 2 can be adapted to actual needs and is not limited.

[0057] In order to detect cracks and fatigue conditions in external threads, this application provides a sensing component 4, which is equipped with a sensor to collect signal data from the surface of the external thread. In this application, the sensor can be a GMR (Giant Magnetoresistance) or a TMR (Tunnel Magnetoresistance) sensor, etc., so as to display changes in magnetic field distribution by detecting the acquired magnetic characteristic data, thereby determining the location of cracks or stress concentration points in the external thread.

[0058] In order to achieve coaxial alignment between the testing tool and the drill string water eye, improve the data acquisition accuracy of the sensing component 4, and reduce errors caused by eccentricity, the testing tool of this application is provided with a positioning part 5. The positioning part 5 is coaxially arranged with the cone 11 and located on one side of the bottom surface 111 of the cone 11. When the testing tool needs to be inserted, the second end of the positioning part 5 is inserted into the drill string water eye. Since the second end of the positioning part 5 is provided with an elastic telescopic structure 51, the elastic telescopic structure 51 can adaptively fit tightly against the inner wall of the drill string water eye, thereby achieving coaxial alignment between the positioning part 5 and the drill string water eye.

[0059] This application provides a portable automatic wellhead inspection tool for fatigue condition of external threads on large deep well drilling tools. A variable-diameter rotating ring 12 is installed in the cone disc 1. A through-hole arc-shaped displacement groove 123 is opened on the variable-diameter rotating ring 12, allowing the first end of a guide rod 31 to pass through the displacement groove 123. The second end of the guide rod 31 slides along the radial direction of the pusher disc 32 with a first mounting groove 321 on the pusher disc 32. This allows the guide rod 31 to maintain parallelism with the axis of the cone disc 11 while adjusting the distance between the axes of the cone disc 11 at the first and second ends of the displacement groove 123. This enables the sensing component 4 connected to the first end of the guide rod 31 to adapt to the inspection of external threads on drilling tools of different sizes, improving the flexibility and versatility of the inspection tool. Furthermore, it eliminates the need for multiple inspection tools to be configured for different sizes of external threads, reducing costs. Operators can easily adjust the inspection tool to meet the inspection needs of external threads on drilling tools of different sizes, improving inspection efficiency. Before testing, the guide rod 31 is positioned in different positions in the displacement groove 123 by rotating the variable diameter swivel ring 12 relative to the cone cylinder 11. This adjusts the guide rod 31 to fit the external thread size on the inner side of the cone cylinder 11 axis. The elastic telescopic structure 51 of the positioning part 5 is used to extend into the drill string water hole and tighten and position it against the inner wall of the drill string water hole, ensuring that the positioning part 5 is coaxial with the drill string water hole and guaranteeing the accuracy of the test results. During testing, the guide rod 31 slides relative to the first mounting groove 321 and the displacement groove 123 under the drive of the push plate 32. This causes the sensing component 4 located at the first end of the guide rod 31 to be driven to form a test trajectory parallel to the side of the cone cylinder 11, thus maintaining the same distance from the measured external thread surface for data acquisition. Through the application of this application, the problem of existing external thread testing devices being limited to testing only single-size drill string external threads, lacking flexibility and versatility, increasing the cost of testing external threads of different sizes of drill strings, and reducing testing efficiency is solved.

[0060] like Figures 3 to 5 As shown, in some embodiments, the variable diameter swivel 12 includes a first variable diameter swivel 121 and a second variable diameter swivel 122. The first variable diameter swivel 121 is located on one side of the bottom surface 111 of the cone 11, and the second variable diameter swivel 122 is located on one side of the top surface 112 of the cone 11. The outer diameter of the first variable diameter swivel 121 is larger than the outer diameter of the second variable diameter swivel 122. The first displacement groove 1211 of the first variable diameter swivel 121 is opposite to the second displacement groove 1221 of the second variable diameter swivel 122. The line connecting the relative positions of the first displacement groove 1211 and the second displacement groove 1221 is parallel to the generatrix of the side of the cone 11. The first end of the guide rod 31 passes through the first displacement groove 1211 and the second displacement groove 1221 respectively.

[0061] Specifically, in order to improve the stability of the testing tool in testing external threads of drill bits of different sizes and specifications, this application provides two variable diameter swivel rings 12, namely a first variable diameter swivel ring 121 and a second variable diameter swivel ring 122. The first variable diameter swivel ring 121 is located on one side of the bottom surface 111 of the cone 11, and the second variable diameter swivel ring 122 is located on one side of the top surface 112 of the cone 11. The outer diameter of the first variable diameter swivel ring 121 is larger than the outer diameter of the second variable diameter swivel ring 122. This makes the first displacement groove 1211 of the first variable diameter swivel ring 121 and the second displacement groove 1221 of the second variable diameter swivel ring 122 opposite to each other, and the line connecting their relative positions is parallel to the generatrix on the side of the cone 11. The first displacement groove 1211 and the second displacement groove 1221 simultaneously limit and guide the guide rod 31, ensuring the stability of the position change of the guide rod 31. In this application, the first variable diameter rotating ring 121 and the second variable diameter rotating ring 122 need to be driven simultaneously to ensure their synchronous rotation, thereby ensuring that the relative positions of the first variable displacement groove 1211 and the second variable displacement groove 1221 remain unchanged and the line connecting their relative positions is always parallel to the generatrix on the side of the cone 11. The simultaneous driving of the first variable diameter rotating ring 121 and the second variable diameter rotating ring 122 can be achieved by setting handles, pull rings, etc.

[0062] like Figure 2 and Figure 6 As shown, in some embodiments, the portable deep well drilling tool external thread fatigue state wellhead automatic detection tool further includes: a plurality of first connecting members 6, the first connecting members 6 are generally cylindrical and have grooves 61 provided on their sides, one end of the plurality of first connecting members 6 is respectively connected to the second end of a plurality of guide rods 31, and the grooves 61 of the plurality of first connecting members 6 are respectively slidably connected to a plurality of first mounting grooves 321.

[0063] Specifically, to improve the relative sliding accuracy of the second end of the guide rod 31 in the first mounting groove 321, the testing tool of this application is also provided with multiple first connecting members 6. The first connecting members 6 are generally cylindrical, so that when connecting the second end of the guide rod 31, the contact area can be increased by means of plugging, embedding, etc., to evenly bear the external load and improve the stability of the connection. The first connecting members 6 have grooves 61 on their sides, so that they can slide and connect with the side wall of the first mounting groove 321 through the grooves 61, so as to ensure that the second end of the guide rod 31 can stably slide back and forth along the radial direction of the push plate 32.

[0064] like Figure 2 and Figure 7 As shown, in some embodiments, the sensing component 4 includes a connecting seat 41, a mounting seat 42 and a sensor. The connecting seat 41 is fitted with the first end of the connecting guide rod 31. The mounting seat 42 is connected to the side of the connecting seat 41 facing the axis of the cone 11. The side of the mounting seat 42 away from the connecting seat 41 has a first accommodating space 421, and the sensor is accommodated in the first accommodating space 421.

[0065] Specifically, the sensing component 4 in this application includes a connecting seat 41, a mounting seat 42, and a sensor (not shown in the figure). The connecting seat 41 is fitted with the first end of the connecting guide rod 31 so that the sensing component 4 can be driven by the guide rod 31 to detect along the conical path of the external thread. The mounting seat 42 is connected to the side of the connecting seat 41 facing the axis of the conical cylinder 11. The connection between the mounting seat 42 and the connecting seat 41 can be achieved by screwing, pinning, snapping, etc. The mounting seat 42 and the connecting seat 41 can also be integrally formed, which is not limited. The mounting seat 42 provides a first receiving space 421 on the side away from the connecting seat 41 to accommodate the sensor. The first receiving space 421 can be provided by setting a limiting groove, or by setting at least two protrusions to clamp the first receiving space 421, which is not limited. The first receiving space 421 is away from the connecting seat 41 so that the sensor can directly face the external thread for detection, avoiding obstruction and interference.

[0066] For a single sensing component 4, the mounting base 42, on the side opposite to the connecting base 41, can have multiple first accommodating spaces 421 to increase the number of sensors that can be configured, enabling multi-channel data acquisition. For example, when there are 8 sensing components 4, each mounting base 42 has 2 first accommodating spaces 421 to accommodate 2 sensors, thus achieving 16-channel signal acquisition. When there are 12 sensing components 4, each mounting base 42 has 3 first accommodating spaces 421 to accommodate 3 sensors, thus achieving 36-channel signal acquisition. Other embodiments with different numbers are not listed here, but the principle is the same. By increasing the number of sensing components 4 and the number of sensors in each sensing component 4, the detection tool can acquire data from more angles and positions. Furthermore, multi-channel data acquisition can provide more dimensional information, facilitating more detailed data analysis and problem diagnosis, and improving the accuracy and reliability of the detection results.

[0067] like Figure 2 and Figure 8 As shown, in some embodiments, the positioning part 5 includes a positioning cylinder 52. The first end of the positioning cylinder 52 is connected to the cone cylinder 11. The second end of the positioning cylinder 52 is provided with a through groove 521 corresponding to the elastic telescopic structure 51. The through groove 521 is used to extend the positioning cylinder 52 when the elastic telescopic structure 51 is tightened so as to tighten and position it with the inner wall of the drill water hole. The positioning cylinder 52 has a step 522 protruding from its first end near itself. The step 522 is spaced apart from the bottom surface 111 of the cone cylinder 11 and forms a second accommodating space 5221. The second accommodating space 5221 is used to accommodate the variable diameter rotating ring 12 located on one side of the bottom surface 111 of the cone cylinder 11.

[0068] Specifically, the positioning part 5 of this application includes a positioning cylinder 52 to realize the installation of the positioning part 5 in the inspection tool. The first end of the positioning cylinder 52 is connected to the cone cylinder 11, and the first end of the positioning cylinder 52 can be inserted into the cone cylinder 11 by interference fit. The second end of the positioning cylinder 52 has a through groove 521 corresponding to the elastic telescopic structure 51. The through groove 521 is used to extend the positioning cylinder 52 when the elastic telescopic structure 51 is tightened so as to tighten and position it with the inner wall of the drill water hole. It can also provide space when the elastic telescopic structure 51 is retracted into the positioning cylinder 52 by the inner wall of the drill water hole. Since the elastic telescopic structure 51 can adaptively adapt to the diameter change of the drill water hole, the operator can quickly insert the second end of the positioning cylinder 52 into the drill water hole and achieve stable positioning, improving the convenience and efficiency of inspection and reducing the difficulty of operation.

[0069] In this application, a step 522 is provided protruding from the positioning cylinder 52 near the first end. The step 522 is spaced apart from the bottom surface 111 of the cone cylinder 11 and forms a second accommodating space 5221 for accommodating the variable diameter rotating ring 12 located on one side of the bottom surface 111 of the cone cylinder 11. The step 522 can limit the position of the variable diameter rotating ring 12 and ensure its position stability in the testing tool. On the other hand, it also provides space for the variable diameter rotating ring 12 to rotate relative to the cone cylinder 11. This allows the guide rod 31 to increase its distance relative to the axis of the cone cylinder 11 while keeping the angle unchanged, thereby adapting to the testing of external threads of different sizes and specifications.

[0070] like Figure 9 As shown, in some embodiments, the positioning part 5 further includes a positioning end cap 53 and a locking assembly 54. The elastic telescopic structure 51 includes a connecting rod assembly 511, a pressure plate 512, and a compression spring 513. The positioning end cap 53 covers the second end of the positioning cylinder 52, and a through hole is provided in the center of the positioning end cap 53. The first end of the locking assembly 54 is engaged with the through hole, and the second end of the locking assembly 54 has a limiting plate 541 disposed inside the positioning cylinder 52. The pressure plate 512 is disposed on the side of the limiting plate 541 away from the cone cylinder 11. The two ends of the compression spring 513 are respectively connected to the pressure plate 512 and the limiting plate 541. The two ends of the connecting rod assembly 511 are respectively connected to the pressure plate 512 and the first end of the positioning cylinder 52. Two ends; wherein, the compression spring 513 has a preload force to cause the pressure plate 512 to push the connecting rod assembly 511 to retract along the axial direction of the positioning cylinder 52 to at least partially extend out of the through groove 521. When the positioning part 5 extends into the drill water hole, the connecting rod assembly 511 is pushed against the inner wall of the drill water hole and then extends along the axial direction of the positioning cylinder 52 and retracts into the positioning cylinder 52 along the through groove 521, causing the pressure plate 512 to move toward the limiting plate 541. The compression spring 513 generates a rebound force, which pushes the pressure plate 512 away from the limiting plate 541 under the action of the rebound force, so that the connecting rod assembly 511 at least partially extends out of the positioning cylinder 52 along the through groove 521 and is tightened and positioned with the inner wall of the drill water hole.

[0071] Specifically, the positioning part 5 in this application also includes a positioning end cap 53 and a locking assembly 54. The positioning end cap 53 covers the second end of the positioning cylinder 52 to achieve the connection and positioning of the locking assembly 54 through a through hole. The second end of the locking assembly 54 is provided with a limit plate 541 to provide a support point for the movement of the elastic telescopic structure 51 within the positioning cylinder 52. The elastic telescopic structure 51 includes a connecting rod assembly 511, a pressure plate 512, and a compression spring 513. The two ends of the connecting rod assembly 511 are respectively connected to the pressure plate 512 and the second end of the positioning cylinder 52. In one embodiment, the connecting rod assembly 511 can be connected to the inner side of the positioning end cap 53 facing the conical plate 1, or a slot can be opened at the second end of the positioning cylinder 52 near itself, with a hole in the slot to achieve the hinge connection between the connecting rod assembly 511 and the positioning cylinder 52. This application can be provided with multiple connecting rod assemblies 511 evenly spaced around the circumference of the positioning cylinder 52, so as to stably extend out of the positioning cylinder 52 and abut against the inner wall of the drill bit water hole. The through groove 521 on the positioning cylinder 52 can be opened to correspond to the connecting rod assembly 511.

[0072] The specific working principle of the positioning part 5 in this application is as follows: Before the positioning part 5 extends into the drill water hole, the pressure spring 513 with preload force causes the pressure plate 512 to push the connecting rod assembly 511 to retract along the axial direction of the positioning cylinder 52 so as to at least partially extend out of the through groove 521. When the positioning part 5 extends into the drill water hole, the connecting rod assembly 511 is pushed against the inner wall of the drill water hole and then extends along the axial direction of the positioning cylinder 52 and retracts into the positioning cylinder 52 along the through groove 521, causing the pressure plate 512 to move toward the limiting plate 541. The pressure spring 513 generates a rebound force, which pushes the pressure plate 512 away from the limiting plate 541, so that the connecting rod assembly 511 at least partially extends out of the positioning cylinder 52 along the through groove 521 and is tightened and positioned with the inner wall of the drill water hole.

[0073] like Figure 10 As shown, in some embodiments, a plurality of second mounting slots 113 corresponding one-to-one with the first mounting slots 321 are formed around the side of the cone cylinder 11, and the first ends of the plurality of guide rods 31 pass through the plurality of displacement slots 123 and the plurality of first mounting slots 321. The portable deep well drilling tool for automatic wellhead inspection of external thread fatigue state also includes a second connector 7 slidably connected to the first end of the guide rod 31. The second connector 7 is slidably connected to the second mounting slots 113, and the second connector 7 can drive the guide rods 31 to slide back and forth in the radial direction of the cone cylinder 11 within the second mounting slots 113.

[0074] Specifically, in order to ensure that the guide rod 31 in the testing tool can always maintain a constant angle relative to the cone 1 during the rotation of the variable diameter swivel ring 12 relative to the cone 11 and the change of position of the guide rod 31 relative to the displacement groove 123, so as to drive the sensing component 4 connected to its first end to perform detection along the external thread, this application provides a plurality of second mounting grooves 113 corresponding one-to-one with the first mounting groove 321 on the side of the cone 11. By setting a second connecting piece 7 in the second mounting groove 113 and slidingly connected to the first end of the guide rod 31, the first end of the guide rod 31 slides synchronously with the second mounting groove 113 along the radial direction of the cone 11 under the drive of the second connecting piece 7 while the position of the guide rod 31 relative to the displacement groove 123 changes. Thus, the angle of the guide rod 31 remains constant and is always parallel to the generatrix of the side of the cone 11, only the distance between it and the axis of the cone 11 increases, thereby enabling the testing tool to adapt to the detection of external threads of different sizes and specifications. Simultaneously, when the variable diameter swivel ring 12 does not rotate relative to the cone cylinder 11, and when the push plate 32 moves linearly under the drive of the linear drive unit 2, the second connecting member 7 can also support the guide rod 31. Furthermore, this application can embed a bearing within the second connecting member 7 to reduce friction between the guide rod 31 and the second connecting member 7, thereby reducing energy loss during relative sliding, improving motion stability, and ultimately enhancing the accuracy of the detection results. Additionally, this application can create holes in the second connecting member 7 and corresponding holes on the side of the cone cylinder 11. After adjusting the distance between the guide rod 31 and the axis of the cone cylinder 11, fastening and limiting can be achieved by inserting pins into the corresponding holes on the second connecting member 7 and the side of the cone cylinder 11.

[0075] like Figure 2 As shown, in some embodiments, the portable deep well drilling tool for automatic wellhead detection of external thread fatigue state further includes: a control unit 8, which is spaced apart on the side of the pusher 32 away from the cone disk 1. Two tubes 9 are provided between the control unit 8 and the linear drive unit 2. A first signal line is provided inside the tubes 9, and the two ends of the first signal line are respectively connected to the control unit 8 and the linear drive unit 2.

[0076] Specifically, to achieve automated control of the testing tool of this application, a control unit 8 is provided. The control unit 8 is spaced apart on the side of the push plate 32 away from the cone plate 1 to avoid occupying the space for testing the external thread of the drill bit. The control unit 8 is wiredly connected to the linear drive unit 2 through a first signal line, so that the forward or reverse rotation control of the linear drive unit 2 can be realized through the control unit 8 to meet the needs of acquiring multiple sets of external thread testing data. The control unit 8 can be a switch box structure with an integrated control module. This application can set different control buttons on the switch box structure to correspond to different driving directions of the linear drive unit 2, and can also set different control buttons to correspond to the preheating mode, standby mode, start mode or shutdown mode of the testing tool, etc., which is not limited to this.

[0077] This application provides two tubes 9 between the control unit 8 and the linear drive unit 2, with a first signal line connecting the control unit 8 and the linear drive unit 2 installed inside the tubes 9. This simplifies the wiring between the linear drive unit 2 and the control unit 8, allowing the first signal line to be centrally managed within the tubes 9, thus improving maintenance convenience. Furthermore, the control of the linear drive unit 2 is achieved through wired signal transmission, reducing delays and interference during signal transmission and ensuring stable and reliable operation of the detection work.

[0078] In some embodiments, the guide rod 31 is hollow inside and is provided with a second signal line. The two ends of the second signal line are respectively connected to the sensing component 4 and the control unit 8, so that the control unit 8 can acquire the data collected by the sensing component 4.

[0079] Specifically, this application simplifies wiring by hollowing out the guide rod 31 and connecting the sensing component 4 and the control unit 8 through a second signal line inside. This reduces the number of external wires and interfaces of the detection tool, lowers the risk of failure, and improves system stability. Furthermore, the second signal line enables efficient transmission of data collected by the sensing component 4 via wired signal transmission, reducing delays and interference during signal transmission and improving the accuracy and integrity of the detection structure.

[0080] like Figure 2 As shown, in some embodiments, it further includes at least one rotating handle 10, which is connected to the edges of the first variable diameter swivel 121 and the second variable diameter swivel 122 respectively.

[0081] Specifically, to facilitate the testing operation by the testing personnel, the testing tool of this application also includes at least one rotating handle 10. By connecting at least one rotating handle 10 to the edges of the first diameter-changing rotating ring 121 and the second diameter-changing rotating ring 122 respectively, the testing personnel can manually drive the rotating handle 10 to simultaneously drive the first diameter-changing rotating ring 121 and the second diameter-changing rotating ring 122 to rotate relative to the cone cylinder 11. Thus, while the relative positions of the first displacement groove 1211 and the second displacement groove 1221 remain unchanged, the guide rod 31 relative to the first displacement groove 1211 and the second displacement groove 1221 is adjusted. When the guide rod 31 is located at the first end of the first displacement groove 1211, it is also located at the second end of the second displacement groove 1221. When the guide rod 31 is located at the second end of the second displacement groove 1221 after the position is changed, the distance between the guide rod 31 and the center of the first diameter changing ring 121 increases, and the distance between the guide rod 31 and the center of the second diameter changing ring 122 also increases. Thus, without changing the angle of the guide rod 31 relative to the axis of the cone cylinder 11, the distance between the guide rod 31 and the axis of the cone cylinder 11 increases, thereby enabling the testing tool to adapt to the testing of external threads of different sizes and specifications.

[0082] Rotating handle 10 connects the edges of the first variable diameter swivel 121 and the second variable diameter swivel 122 respectively, so as to enable simultaneous driving of the first variable diameter swivel 121 and the second variable diameter swivel 122. This ensures that the angle of the guide rod 31 relative to the cone 11 does not change, only the distance between it and the axis of the cone 11 increases, thus improving the synchronicity of the position change of the guide rod 31. At the same time, rotating handle 10 can also limit the first variable diameter swivel 121 and the second variable diameter swivel 122 in the testing tool, preventing the first variable diameter swivel 121 and the second variable diameter swivel 122 from shifting or loosening relative to the cone 11, thereby improving the overall stability of the testing tool.

[0083] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0084] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A portable automatic wellhead inspection tool for fatigue condition of external threads on large deep well drilling tools, characterized in that, include: A conical disc (1) includes a conical cylinder (11) and at least one variable diameter swivel ring (12). The at least one variable diameter swivel ring (12) is concentrically arranged to fit against the bottom surface (111) and / or top surface (112) of the conical cylinder (11) and can rotate relative to the conical cylinder (11). A portion of the edge of the variable diameter swivel ring (12) protrudes from the side of the conical cylinder (11), and a plurality of through displacement grooves (123) are provided along the circumferential direction on the portion of the edge. The displacement grooves (123) are arc-shaped, and the first end of the displacement groove (123) is close to the center of the variable diameter swivel ring (12) relative to the second end. A linear drive unit (2) is disposed inside the cone (11), with the drive end extending out from the center of the top surface (112) of the cone (11) and extending along the axis of the cone (11); The transmission part (3) includes multiple guide rods (31) and a push plate (32). The center of the push plate (32) is connected to the drive end. Multiple first mounting grooves (321) are opened around the edge of the push plate (32). The multiple first mounting grooves (321) are respectively opposite to the multiple displacement grooves (123). The first ends of the multiple guide rods (31) pass through the multiple displacement grooves (123). The second ends of the guide rods (31) are slidably connected to the first mounting grooves (321) opposite to the displacement grooves (123), and the sliding direction is the radial direction of the push plate (32). The guide rods (31) are parallel to the generatrix of the side of the cone (11). Multiple sensing components (4) are respectively connected to the first end of multiple guide rods (31); The positioning part (5) is coaxially arranged with the cone (11) and located on one side of the bottom surface (111) of the cone (11). The first end of the positioning part (5) is connected to the cone (11), and the second end of the positioning part (5) has an elastic telescopic structure (51). The elastic telescopic structure (51) can extend and retract along the axial direction of the positioning part (5). The elastic telescopic structure (51) is used to extend into the water eye of the drill bit and tighten and position itself with the inner wall of the water eye of the drill bit, so that the positioning part (5) is coaxial with the water eye of the drill bit.

2. The portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, The variable diameter swivel (12) includes a first variable diameter swivel (121) and a second variable diameter swivel (122). The first variable diameter swivel (121) is located on one side of the bottom surface (111) of the cone (11), and the second variable diameter swivel (122) is located on one side of the top surface (112) of the cone (11). The outer diameter of the first variable diameter swivel (121) is larger than the outer diameter of the second variable diameter swivel (122). The first displacement groove (1211) of the first variable diameter swivel (121) is opposite to the second displacement groove (1221) of the second variable diameter swivel (122). The line connecting the relative positions of the first displacement groove (1211) and the second displacement groove (1221) is parallel to the generatrix on the side of the cone (11). The first end of the guide rod (31) passes through the first displacement groove (1211) and the second displacement groove (1221), respectively.

3. The portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, Also includes: Multiple first connectors (6) are cylindrical in shape and have grooves (61) on their sides. One end of each of the multiple first connectors (6) is connected to the second end of each of the multiple guide rods (31). The grooves (61) of the multiple first connectors (6) are slidably connected to each of the multiple first mounting slots (321), and the sliding direction is radial to the push plate (32).

4. The portable automatic wellhead detection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, The sensing component (4) includes a connecting seat (41), a mounting seat (42) and a sensor. The connecting seat (41) is sleeved on the first end of the guide rod (31). The mounting seat (42) is connected to the side of the connecting seat (41) facing the axis of the cone (11). The side of the mounting seat (42) away from the connecting seat (41) has a first accommodating space (421). The sensor is accommodated in the first accommodating space (421).

5. The portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, The positioning part (5) includes a positioning cylinder (52). The first end of the positioning cylinder (52) is connected to the cone cylinder (11). The second end of the positioning cylinder (52) is provided with a through groove (521) corresponding to the elastic telescopic structure (51). The through groove (521) is used to extend the positioning cylinder (52) when the elastic telescopic structure (51) is contracted so as to tighten and position with the inner wall of the drill water hole. The positioning cylinder (52) has a step (522) protruding from its first end near itself. The step (522) is spaced apart from the bottom surface (111) of the cone cylinder (11) and forms a second accommodating space (5221). The second accommodating space (5221) is used to accommodate the variable diameter swivel ring (12) located on one side of the bottom surface (111) of the cone cylinder (11).

6. The portable automatic wellhead detection tool for fatigue condition of external threads in deep well drilling tools according to claim 5, characterized in that, The positioning part (5) further includes a positioning end cap (53) and a locking assembly (54). The elastic telescopic structure (51) includes a connecting rod assembly (511), a pressure plate (512), and a compression spring (513). The positioning end cap (53) covers the second end of the positioning cylinder (52). A through hole is provided in the center of the positioning end cap (53). The first end of the locking assembly (54) is engaged with the through hole. The second end of the locking assembly (54) has a limiting plate (541) disposed inside the positioning cylinder (52). The pressure plate (512) is disposed on the side of the limiting plate (541) away from the cone cylinder (11). The two ends of the compression spring (513) are respectively connected to the pressure plate (512) and the limiting plate (541). The two ends of the connecting rod assembly (511) are respectively connected to the pressure plate (512) and the second end of the positioning cylinder (52). The compression spring (513) has a preload force to cause the pressure plate (512) to push the connecting rod assembly (511) to retract along the axial direction of the positioning cylinder (52) to at least partially extend out of the through groove (521). When the positioning part (5) extends into the drill water hole, the connecting rod assembly (511) is pushed against the inner wall of the drill water hole and extends along the axial direction of the positioning cylinder (52) and retracts into the positioning cylinder (52) along the through groove (521), causing the pressure plate (512) to move toward the limiting plate (541). The compression spring (513) generates a rebound force, which pushes the pressure plate (512) away from the limiting plate (541) to move, so that the connecting rod assembly (511) at least partially extends out of the positioning cylinder (52) along the through groove (521) and is tightened and positioned with the inner wall of the drill water hole.

7. The portable automatic wellhead inspection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, The cone (11) has multiple second mounting slots (113) that correspond one-to-one with the first mounting slot (321) on its side. The first ends of the multiple guide rods (31) pass through the multiple displacement slots (123) and the multiple first mounting slots (321). The portable deep well drilling tool external thread fatigue state wellhead automatic detection tool also includes a second connector (7) slidably connected to the first end of the guide rod (31). The second connector (7) is slidably connected to the second mounting groove (113). The second connector (7) is able to reciprocate the first end of the guide rod (31) in the second mounting groove (113) along the radial direction of the cone (11).

8. The portable automatic wellhead detection tool for fatigue condition of external threads of large deep well drilling tools according to claim 1, characterized in that, Also includes: The control unit (8) is spaced apart on the side of the push plate (32) away from the cone plate (1). Two tubes (9) are provided between the control unit (8) and the linear drive unit (2). A first signal line is provided inside the tube (9). The two ends of the first signal line are respectively connected to the control unit (8) and the linear drive unit (2).

9. The portable automatic wellhead detection tool for fatigue condition of external threads in deep well drilling tools according to claim 8, characterized in that, The guide rod (31) is hollow inside and is provided with a second signal line. The two ends of the second signal line are respectively connected to the sensing component (4) and the control unit (8) so that the control unit (8) can acquire the data collected by the sensing component (4).

10. The portable automatic wellhead detection tool for fatigue state of external threads of large deep well drilling tools according to claim 2, characterized in that, Also includes: At least one rotating handle (10) is connected to the edges of the first variable diameter swivel (121) and the second variable diameter swivel (122), respectively.

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