Portable wellhead automatic detection tool for fatigue state of inner thread of large drilling tool in deep well

Abstract

The application discloses a portable deep well large drill pipe inner thread fatigue state well mouth automatic detection tool and relates to the field of oil drill pipe detection. The portable deep well large drill pipe inner thread fatigue state well mouth automatic detection tool comprises a conical cylinder, a detection part, a transmission assembly and a driving part. The detection part comprises a plurality of sensing assemblies and a plurality of guide rods, the sensing assemblies are slidably sleeved on the guide rods, the plurality of guide rods are connected with the bottom surface of the conical cylinder in a uniform and spaced manner along the circumference of the conical cylinder, and the guide rods are parallel to the generatrix of the side surface of the conical cylinder. The transmission assembly comprises a push disc and a plurality of connecting pieces, a plurality of second installation grooves are formed in the edge of the push disc, the connecting pieces are slidably connected with the second installation grooves respectively, and the connecting pieces can slide along the radial direction of the push disc with the sensing assemblies in the second installation grooves. The problem that the existing drill pipe inner thread stress detection device occupies space due to the existence of the bow spring seat and the bow spring sheet, so that the inner side of the thread cone surface has an area that cannot be detected, and the comprehensiveness of the detection result is affected is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of oil drill rod detection, and particularly relates to a portable wellhead automatic detection tool for fatigue state of inner thread of large drill rod in deep well. BACKGROUND

[0002] Oil field drill rods play an important role in exploration and development, especially in deep well or ultra-deep well drilling operations. Due to high temperature, high pressure, and complex formation, the fatigue damage of the inner thread of the drill rod is aggravated, which makes the inner thread of the drill rod prone to fatigue cracks, wear and corrosion, and even causes the drill rod to break, resulting in significant economic losses and safety hazards. Therefore, it is necessary to detect the fatigue state of the inner thread of the drill rod to find and prevent the accidents in time.

[0003] In the Chinese patent CN106289587A, a drill rod inner thread stress detection device is disclosed, which is provided with a bow spring seat and a bow spring piece at one end of the device. When the device is in operation, the screw rod motor rotates, and the screw rod nut moves along the length direction of the screw rod, and then the bow spring seat moves along the length direction of the screw rod, and the bow spring piece is pushed by the bow spring seat, and then the detector moves along the thread taper under the guidance of the guide rod. Figure 1

[0004] However, the inventors find that the prior art has some problems. The existing drill rod inner thread stress detection device is provided with a bow spring seat and a bow spring piece at one end, so that when the device is inserted into the inner wall of the drill rod thread, the bow spring seat and the bow spring piece occupy space, and there is a part of the inner side of the thread taper that cannot be detected, which affects the comprehensiveness of the detection results. SUMMARY

[0005] The application aims to provide a portable wellhead automatic detection tool for fatigue state of inner thread of large drill rod in deep well, so as to solve the problem that the existing drill rod inner thread stress detection device is provided with a bow spring seat and a bow spring piece at one end, so that when the device is inserted into the inner wall of the drill rod thread, the bow spring seat and the bow spring piece occupy space, and there is a part of the inner side of the thread taper that cannot be detected, which affects the comprehensiveness of the detection results.

[0006] To solve the above technical problems, the application provides the following technical solutions:

[0007] The application provides a portable wellhead automatic detection tool for fatigue state of inner thread of large drill rod in deep well, which comprises:

[0008] The tapered cylinder has a preset taper, and a plurality of first installation grooves are uniformly arranged on the side surface of the tapered cylinder in the circumferential direction. ​

[0009] The detection part comprises a plurality of sensing assemblies and a plurality of guide rods, the sensing assemblies are slidingly sleeved on the guide rods, the plurality of guide rods are connected with the bottom surface of the tapered cylinder and correspond to the plurality of first installation grooves in a one-to-one manner, and the guide rods are parallel to the generatrix of the side surface of the tapered cylinder;

[0010] The transmission assembly comprises a push disc and a plurality of connecting pieces, the push disc is coaxially arranged with the tapered cylinder, a plurality of second installation grooves corresponding to the first installation grooves are arranged on the edge of the push disc, the plurality of connecting pieces are slidingly connected with the plurality of second installation grooves respectively, and each connecting piece is connected with one sensing assembly, the whole transmission assembly is composed of the push disc, the connecting pieces and the sensing assemblies, and in the movement process of the push disc, power is transmitted to the sensing assemblies through the connecting pieces, and then the sensing assemblies are driven to reciprocate in the axial direction.

[0011] The driving part is connected with the bottom surface of the tapered cylinder and connected with the push disc.

[0012] In the first relative position relationship, the transmission assembly is located on the side of the top surface of the tapered cylinder, the driving part drives the push disc to move the connecting pieces towards the tapered cylinder, the connecting pieces drive the sensing assemblies to reciprocate in the axial direction, so that the transmission assembly is switched from the first relative position relationship to the second relative position relationship relative to the tapered cylinder.

[0013] In some embodiments, the foregoing portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread of deep well, wherein the connecting piece has a third installation groove, the third installation groove is slidingly connected with the second installation groove, and the connecting piece is connected with the sensing assembly on the side of the push disc away from the bottom surface of the tapered cylinder.

[0014] In some embodiments, the foregoing portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread of deep well, the cross section of the sensing assembly is in the shape of a circular arc, wherein the outer diameter of the side of the sensing assembly facing the push disc is smaller than the outer diameter of the top surface of the tapered cylinder.

[0015] In some embodiments, the foregoing portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread of deep well, wherein the driving part comprises a linear motor and a driving rod, the linear motor is arranged on the bottom surface of the tapered cylinder, a first through hole is arranged in the center of the bottom surface of the tapered cylinder, the driving rod extends in the direction of the top surface of the tapered cylinder and protrudes from the position of the top surface, one end of the driving rod is connected with the linear motor, and the push disc is sleeved on the end of the driving rod protruding from the top surface.

[0016] In some embodiments, the foregoing portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread of deep well, wherein a plurality of second through holes are arranged on the bottom surface and spaced apart around the first through hole, the axis of the second through hole is parallel to the generatrix of the side surface of the tapered cylinder, a bearing is arranged in the second through hole, and the guide rod is arranged in the bearing.

[0017] In some embodiments, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well, wherein the side of the sensing assembly away from the connecting piece has a target surface, and the target surface is parallel to the side surface of the cone cylinder.

[0018] In some embodiments, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well, wherein the sensing assembly comprises a sensor box and a sensor, the sensor box has at least one first accommodating space inside, and the first accommodating space accommodates the sensor; the first surface of one side of the sensor box is fixedly connected to the connecting piece; the second surface of the sensor box opposite to the first surface is provided with a limiting groove, and the limiting groove forms the first accommodating space; or, the second surface of the sensor box opposite to the first surface is provided with at least two protrusions, and the at least two protrusions enclose the first accommodating space.

[0019] In some embodiments, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well, wherein the transmission assembly further comprises a limiting block, the limiting block is connected to one side of the second installation groove close to the edge of the push plate, and the limiting block is closer to the edge of the push plate than the guide rod.

[0020] In some embodiments, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well, further comprising: a protective cover, the protective cover is arranged on the side of the bottom surface away from the transmission assembly and encloses the second accommodating space with the bottom surface, and the second accommodating space is used for placing the linear motor in the driving part.

[0021] In some embodiments, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well, further comprising: a holding part, the holding part is connected to the cone cylinder, the holding part is provided with a control module, and the control module is electrically connected to the driving part; the guide rod is hollow inside and is provided with a signal line, and the two ends of the signal line are connected to the sensing assembly and the control module respectively, so that the control module obtains the data collected by the sensing assembly.

[0022] Through the above technical solutions, the portable wellhead automatic detection tool for fatigue state of large drill pipe internal thread in deep well has at least the following advantages:

[0023] The application provides a portable wellhead automatic detection tool for fatigue state of inner thread of large drill tool in deep well, which comprises a conical cylinder, a detection part, a transmission assembly and a driving part; the conical cylinder has a preset taper, and a plurality of first installation grooves are uniformly arranged on the side surface of the conical cylinder in the circumferential direction; the detection part comprises a plurality of sensing assemblies and a plurality of guide rods, the sensing assembly is slidably sleeved on the guide rod, the plurality of guide rods are uniformly and spaced apart in the circumferential direction of the conical cylinder and connected with the bottom surface of the conical cylinder, and correspond to the plurality of first installation grooves one by one, and the guide rod is parallel to the generatrix of the side surface of the conical cylinder; the transmission assembly comprises a push disc and a plurality of connecting pieces, the push disc is coaxially arranged with the conical cylinder, a plurality of second installation grooves corresponding to the first installation grooves are arranged on the edge of the push disc, the plurality of connecting pieces are slidably connected with the plurality of second installation grooves respectively, and each connecting piece is connected with one sensing assembly; the connecting piece can slide with the sensing assembly in the second installation groove in the radial direction of the push disc; the driving part is connected with the bottom surface of the conical cylinder, and the driving part is connected with the push disc; wherein the transmission assembly has a switchable first relative position relationship and a second relative position relationship with the conical cylinder, in the first relative position relationship, the transmission assembly is located on the side of the top surface of the conical cylinder, the driving part drives the push disc to move towards the conical cylinder, the connecting piece drives the sensing assembly to slide relative to the guide rod, so that the transmission assembly is switched from the first relative position relationship to the second relative position relationship with the conical cylinder. By arranging the push disc and the sensing assembly on the side of the top surface of the conical cylinder, when the detection tool is inserted into the drill tool, the sensing assembly can take the innermost end of the inner thread as the starting position to carry out detection work, thereby avoiding the detection blind area caused by occupying space in the existing structure, increasing the detection stroke, and ensuring the comprehensiveness of the detection result. Moreover, the sensing assembly can slide relative to the guide rod under the driving of the push disc to form a track parallel to the side surface of the conical cylinder with the preset taper, thereby keeping the same distance with the inner thread surface to be measured at all times to collect detection data, and ensuring the accuracy of the detection result. Through the application of the application, the existing drill tool inner thread stress detection device is provided with a bow spring seat and a bow spring piece at one end, so that when the device is inserted into the inner wall of the drill tool thread, the bow spring seat and the bow spring piece will occupy space, so that there is a part of the inner side of the thread taper that cannot be detected, which affects the comprehensiveness of the detection result.

[0024] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and can be implemented according to the content of the description, the following will be described in detail with the preferred embodiments of the application and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creating any inventive effort.

[0026] Figure 1 The structure schematic diagram of the existing inspection technology-drill pipe internal thread stress detection device (CN106289587A) is schematically shown;

[0027] Figure 2 The shaft structure schematic diagram of the portable deep well large drill pipe internal thread fatigue state wellhead automatic detection tool provided by the embodiment of the application is schematically shown;

[0028] Figure 3 The first kind of sectional structure schematic diagram of the portable deep well large drill pipe internal thread fatigue state wellhead automatic detection tool provided by the embodiment of the application is schematically shown;

[0029] Figure 4 The second kind of sectional structure schematic diagram of the portable deep well large drill pipe internal thread fatigue state wellhead automatic detection tool provided by the embodiment of the application is schematically shown;

[0030] Figure 5 The local structure schematic diagram of the portable deep well large drill pipe internal thread fatigue state wellhead automatic detection tool provided by the embodiment of the application is schematically shown;

[0031] Figure 6 The structure schematic diagram of the connecting piece of the portable deep well large drill pipe internal thread fatigue state wellhead automatic detection tool provided by the embodiment of the application is schematically shown.

[0032] Explanation of reference numerals

[0033] 1, cone cylinder; 11, first mounting groove; 12, bottom surface; 13, top surface; 14, first through hole; 121, second through hole; 122, bearing;

[0034] 2, detection part; 21, sensing assembly; 22, guide rod; 211, target surface;

[0035] 3, transmission assembly; 31, push disc; 32, connecting piece; 311, second mounting groove; 321, third mounting groove;

[0036] 4, driving part; 41, linear motor; 42, driving rod;

[0037] 5, protective cover;

[0038] 6, holding part. DETAILED DESCRIPTION

[0039] The embodiments of the present disclosure will be described in further detail below with reference to the drawings and examples. The following detailed description of the examples and the accompanying drawings are provided to illustrate the principles of the present disclosure, and should not be taken in a limiting sense. The present disclosure can be implemented in numerous ways, including, but not limited to, the specific embodiments described in this document. Rather, any number of variations and modifications of the described embodiments can be used to implement the present disclosure, and each such variation and modification is intended to fall within the scope of the present disclosure.

[0040] The present disclosure provides these examples in order to more completely illustrate the principles of the present disclosure and to enable one skilled in the art to make and use the disclosure. It is expressly noted, however, that the examples set forth in these examples are intended to be exemplary only and should not be used to limit the scope of the present disclosure in any way.

[0041] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the relative position or orientation relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In addition, the "first", "second", and similar words used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0043] It should also be noted that, in the description of the present disclosure, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between a first device and a second device, there can be an intermediate device between the specific device and the first device or the second device, or there can be no intermediate device.

[0044] All terms used herein have the same meaning as those understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and not in an idealized or overly formal sense, unless expressly so defined herein.

[0045] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification.

[0046] As shown in Figure 1 The prior art of the drilling tool internal thread detection device is a drilling tool internal thread stress detection device (CN106289587A). The main advantage of this device over the prior art is the transmission mechanism of the device. As shown in Figure 1 The transmission mechanism of the prior art device is located at the top end of the device. This disadvantage is that the redundant structure at the top will interfere with the drilling tool water hole during actual use, resulting in the inability to meet the detection needs of various size specifications of drilling tool internal threads. The drilling tool internal thread detection tool provided by the present application, as shown in Figure 2 The transmission mechanism is located inside the detection device by optimizing the structure, removing the redundant mechanism, reducing the size of the device, and making the device adaptable to the detection needs of various drilling tool internal threads.

[0047] As shown in Figures 2 to 5As shown, the application provides a portable wellhead automatic detection tool for fatigue state of inner thread of large drill tool in deep well, which comprises a conical cylinder 1, a detection part 2, a transmission assembly 3 and a driving part 4. The conical cylinder 1 has a preset taper, and a plurality of first installation grooves 11 are uniformly arranged on the side surface of the conical cylinder 1 in the circumferential direction. The detection part 2 comprises a plurality of sensing assemblies 21 and a plurality of guide rods 22, the sensing assembly 21 is slidingly sleeved on the guide rod 22, the plurality of guide rods 22 are uniformly and spaced apart in the circumferential direction of the conical cylinder 1 and connected with the bottom surface 12 of the conical cylinder 1, and correspond to the plurality of first installation grooves 11 one by one, and the guide rod 22 is parallel to the generatrix of the side surface of the conical cylinder 1. The transmission assembly 3 comprises a push disc 31 and a plurality of connecting pieces 32, the push disc 31 is coaxially arranged with the conical cylinder 1, a plurality of second installation grooves 311 corresponding to the first installation grooves 11 are arranged on the edge of the push disc 31, the plurality of connecting pieces 32 are respectively slidingly connected with the plurality of second installation grooves 311, and each connecting piece 32 is connected with one sensing assembly 21, and the connecting piece 32 can slide with the sensing assembly 21 in the radial direction of the push disc 31 in the second installation groove 311. The driving part 4 is connected with the bottom surface 12 of the conical cylinder 1, and the driving part 4 is connected with the push disc 31. The transmission assembly 3 has a switchable first relative position relationship and a second relative position relationship with respect to the conical cylinder 1. In the first relative position relationship, the transmission assembly 3 is located on one side of the top surface 13 of the conical cylinder 1, the driving part 4 drives the push disc 31 to drive the connecting piece 32 to move towards the conical cylinder 1, the connecting piece 32 drives the sensing assembly 21 to slide relative to the guide rod 22, so that the transmission assembly 3 is switched from the first relative position relationship to the second relative position relationship with respect to the conical cylinder 1.

[0048] Specifically, the portable wellhead automatic detection tool for fatigue state of inner thread of large drill tool in deep well provided by the application can detect the fatigue state of the inner thread of the drill tool in the drilling operation of the deep well or the ultra-deep well. The conical cylinder 1 is provided, the conical cylinder 1 has a preset taper, the preset taper matches the taper of the inner taper surface of the large drill tool to be measured, and then the side surface of the conical cylinder 1 can be clamped in the drill tool under the preset taper. The conical cylinder 1 with the preset taper has a bottom surface 12 and a top surface 13, the bottom surface 12 is one end of the cylinder body of the conical cylinder 1 with a larger outer diameter, and the top surface 13 is one end of the cylinder body of the conical cylinder 1 with a smaller outer diameter.

[0049] In order to realize the detection of the fatigue state of the inner thread, the application is provided with the detection part 2, the detection part 2 comprises a plurality of sensing assemblies 21 and a plurality of guide rods 22, the sensing assembly 21 can be provided with a sensor to be able to collect signal data of the surface of the inner thread, and the sensor can be selected from GMR (Giant Magnetoresistance, giant magnetoresistance sensor), TMR (Tunnel Magnetoresistance, tunnel magnetoresistance sensor) and the like in the application, so as to be able to display the change of the magnetic field distribution by detecting the obtained magnetic characteristic data, so as to judge the position of the crack or the stress concentration point of the inner thread.

[0050] The guide rod 22 is parallel to the generatrix of the conical cylinder 1 with a preset taper to provide limiting and guiding for the movement of the sensing assembly 21, the sensing assembly 21 is sleeved on the guide rod 22, so that the sensing assembly 21 slides relative to the guide rod 22 to form a trajectory parallel to the generatrix of the conical cylinder 1 with a preset taper. The conical cylinder 1 is uniformly provided with a plurality of first installation grooves 11 in the circumferential direction, and the guide rod 22 corresponds to the plurality of first installation grooves 11 one by one, so that the first installation grooves 11 provide space for the arrangement of the guide rod 22, and also play a guiding and limiting role for the movement of the sensing assembly 21 relative to the guide rod 22.

[0051] In another embodiment, one end of the guide rod 22 is fixedly connected with the sensing assembly 21, and the other end is slidably connected to the bottom surface 12 of the conical cylinder 1. The connecting piece 32 can slide the sensing assembly 21 in the radial direction of the push plate 31 along the second installation groove 311. The other end of the guide rod 22 can extend out of the bottom surface 12 of the conical cylinder 1 away from the side of the push plate 31. Both of the above-mentioned ways can realize the measurement of the sensing assembly 21 along the trajectory parallel to the side surface of the conical cylinder 1, which can be adaptively set according to requirements.

[0052] In order to realize the driving movement of the sensing assembly 21, the application is provided with a transmission assembly 3, which includes a push plate 31 coaxially arranged with the conical cylinder 1. A plurality of second installation grooves 311 corresponding to the first installation grooves 11 are arranged around the edge of the push plate 31. A connecting piece 32 for connecting the sensing assembly 21 is connected to the second installation groove 311. The connecting piece 32 is limited by the second installation groove 311 and cannot be separated from the push plate 31 in the axial direction, but has the freedom of movement in the radial direction, so that the connecting piece 32 can slide the sensing assembly 21 in the radial direction of the push plate 31 along the second installation groove 311, and then the sensing assembly 21 can always slide relative to the guide rod 22 to form a trajectory parallel to the side surface of the conical cylinder 1 with a preset taper. In order to realize the driving of the push plate 31, the application further provides a driving part 4, which can be a combination of a stepping motor and a screw, or a driving end of a linear motor connected to a connecting rod to drive the push plate 31 to move linearly, which is not limited.

[0053] The transmission assembly 3 has switchable first and second relative position relationships with respect to the cone 1. The push disc 31 in the transmission assembly 3 can be driven by the driving part 4 to move towards or away from the cone 1 to switch between the first and second relative position relationships. In the first relative position relationship, the transmission assembly 3 is located on the side of the top surface 13 of the cone 1, so that the sensing assembly 21 can start the detection operation from the innermost end of the internal thread, thereby avoiding the detection blind area caused by the occupation of space in the prior structure, increasing the detection stroke, and ensuring the comprehensiveness of the detection result. The second relative position relationship is obtained by driving the push disc 31 to move the connecting piece 32 towards the cone 1 by the driving part 4, and sliding the sensing assembly 21 relative to the guide rod 22 by the connecting piece 32. The second relative position relationship determines the maximum movement stroke of the sensing assembly 21. The extension length of the cone 1, the first mounting groove 11 and the size of the guide rod 22 can be adjusted according to the axial length of the internal thread of the drill string to be detected, and the specific adjustment is not limited.

[0054] The application provides a portable wellhead automatic detection tool for fatigue state of inner thread of large drilling tool in deep well, which comprises a conical cylinder 1, a detection part 2, a transmission assembly 3 and a driving part 4. The conical cylinder 1 has a preset taper, and a plurality of first installation grooves 11 are uniformly arranged on the side surface of the conical cylinder 1 in the circumferential direction. The detection part 2 comprises a plurality of sensing assemblies 21 and a plurality of guide rods 22, the sensing assembly 21 is slidingly sleeved on the guide rod 22, the plurality of guide rods 22 are connected with the bottom surface 12 of the conical cylinder 1 in the circumferential direction and correspond to the plurality of first installation grooves 11 one by one, and the guide rod 22 is parallel to the generatrix of the side surface of the conical cylinder 1. The transmission assembly 3 comprises a push disc 31 and a plurality of connecting pieces 32, the push disc 31 is coaxially arranged with the conical cylinder 1, a plurality of second installation grooves 311 corresponding to the first installation grooves 11 are arranged on the edge of the push disc 31 in a circle, the plurality of connecting pieces 32 are slidingly connected with the plurality of second installation grooves 311 respectively, and each connecting piece 32 is connected with one sensing assembly 21, and the connecting piece 32 can drive the sensing assembly 21 to reciprocate in the radial direction of the push disc 31 in the second installation groove 311. The driving part 4 is connected with the bottom surface 12 of the conical cylinder 1, and the driving part 4 is connected with the push disc 31. The transmission assembly 3 has switchable first relative position relationship and second relative position relationship with the conical cylinder 1, in the first relative position relationship, the transmission assembly 3 is located on one side of the top surface 13 of the conical cylinder 1, the driving part 4 drives the push disc 31 to drive the connecting piece 32 to move towards the conical cylinder 1, the connecting piece 32 drives the sensing assembly 21 to slide relative to the guide rod 22, so that the transmission assembly 3 is switched from the first relative position relationship to the second relative position relationship relative to the conical cylinder 1. According to the application, the push disc 31 and the sensing assembly 21 are arranged on one side of the top surface 13 of the conical cylinder 1, so that when the detection tool is inserted into the drilling tool, the sensing assembly 21 can take the innermost end of the inner thread as the starting position to carry out detection work, thereby avoiding the detection blind area caused by occupying space in the existing structure, improving the detection stroke and ensuring the comprehensiveness of the detection result. Moreover, the sensing assembly 21 can slide relative to the guide rod 22 under the driving of the push disc 31 to form a track parallel to the side surface of the conical cylinder 1 with the preset taper, thereby keeping the same distance with the inner thread surface to be measured to collect detection data and ensure the accuracy of the detection result. Through the application of the application, the problem that the existing drilling tool inner thread stress detection device has one end provided with a bow spring seat and a bow spring piece, so that when the device is inserted into the inner wall of the drilling tool thread, the bow spring seat and the bow spring piece occupy space to make the inner side of the thread taper have an area that cannot be detected, thereby affecting the comprehensiveness of the detection result.

[0055] As shown in Figures 2 to 6 some embodiments, the connecting piece 32 has a third installation groove 321, the third installation groove 321 is slidingly connected with the second installation groove 311, and the connecting piece 32 is connected with the sensing assembly 21 on the side of the push disc 31 away from the bottom surface 12 of the conical cylinder 1.

[0056] Specifically, in order to improve the position accuracy of the sensing assembly 21 during the movement process, and to ensure the stable sliding of the connecting piece 32 and the sensing assembly 21 in the radial direction of the push disc 31, the connecting piece 32 of the present application has a third mounting groove 321, which is connected with the second mounting groove 311 through the third mounting groove 321 and the second mounting groove 311. That is, the displacement of the connecting piece 32 in the axial direction of the cone cylinder 1 is limited, and the connecting piece 32 can also slide along the radial direction of the push disc 31 with the sensing assembly 21 in the second mounting groove 311. The second mounting groove 311 is opened around the edge of the push disc 31, and the second mounting groove 311 extends in the radial direction of the push disc 31. In order to meet the placement of the sensing assembly 21, the connecting piece 32 can be placed parallel to the side surface of the cone cylinder 1, so as to facilitate the connection between the connecting piece 32 and the sensing assembly 21. The third mounting groove 321 can be two third mounting grooves opened on both sides of the connecting piece 32, which are respectively connected with the groove wall of the second mounting groove 311.

[0057] The connecting piece 32 of the present application is connected with the sensing assembly 21 on the side of the push disc 31 away from the bottom surface 12 of the cone cylinder 1, so that the structure of the sensing assembly 21 is located at one end of the detection tool as a whole. When the detection tool is placed in the inner wall of the drilling thread, the sensing assembly 21 can have the maximum test stroke relative to the cone cylinder 1, thereby avoiding the detection blind area caused by occupying space in the existing structure, improving the space utilization, and improving the comprehensiveness of the detection result.

[0058] As shown in Figure 3 and Figure 4 In some embodiments, the outer diameter of the side of the sensing assembly 21 facing the push disc 31 is smaller than the outer diameter of the top surface 13 of the cone cylinder 1.

[0059] Specifically, since the sensing assembly 21 is provided with the push disc 31 on the top surface 13 of the cone barrel 1, the push disc 31 can directly abut against the top surface 13 of the cone barrel 1 or have a certain distance from the top surface 13 of the cone barrel 1. In order to ensure the smoothness of the detection tool in the running-in process, in the present application, the sensing assembly is in the shape of a circular arc, and when the sensing assembly 21 is gathered on one side of the top surface 13 of the cone barrel 1, the sensing assembly 21 forms a cone structure, the maximum outer diameter of the cone structure is smaller than the outer diameter of the top surface 13 of the cone barrel 1 (it can also be understood that the maximum outer diameter of the cone structure is slightly smaller than the outer diameter of the top surface 13 of the cone barrel 1), so that in an embodiment, the outer side of the sensing assembly 21 can be in the same straight line as the side of the cone barrel 1, so as to decrease along the preset taper, so that the end of the sensing assembly 21 as the detection tool can smoothly enter the deep part of the inner wall of the drill tool thread, and after the positioning of the cone barrel 1, the measurement operation under the sliding of the sensing assembly 21 relative to the guide rod 22 is started. In an embodiment, the straight line where the outer side of the sensing assembly 21 is located can also be close to the axis of the cone barrel 1 relative to the straight line where the side of the cone barrel 1 is located, which is specifically not limited, so that the sensing assembly 21 and the measured inner thread surface always maintain the same distance for detection data collection, and the blockage and interference in the movement process can be avoided.

[0060] As shown in Figure 3 and Figure 4 In some embodiments, the driving part 4 includes a linear motor 41 and a driving rod 42. The linear motor 41 is arranged on the bottom surface 12 of the cone barrel 1. A first through hole 14 is formed in the center of the bottom surface 12 of the cone barrel 1. The driving rod 42 extends through the first through hole 14 to the top surface 13 of the cone barrel 1 and extends out of the position of the top surface 13. One end of the driving rod 42 is connected with the linear motor 41. The push disc 31 is sleeved on the end of the driving rod 42 extending out of the top surface 13.

[0061] Specifically, in order to realize the linear motion of the push disc 31 to drive the sensing assembly 21 connected with the connecting piece 32 to slide relative to the guide rod 22 to complete the detection of the inner thread, in an embodiment, the present application is realized by the linear motor 41 and the driving rod 42. The linear motor 41 is arranged on the bottom surface 12 of the cone barrel 1. In order to meet the placement requirement of the driving rod 42, the first through hole 14 is formed in the center of the bottom surface 12 of the cone barrel 1. The driving rod 42 extends through the first through hole 14 to the top surface 13 of the cone barrel 1 and extends out of the position of the top surface 13. The end of the driving rod 42 is connected with the linear motor 41 to transmit the driving force of the linear motor 41 for linear motion, thereby driving the linear motion of the push disc 31.

[0062] In another embodiment, the driving part 4 of the present application can also include a stepper motor, a lead screw and a nut, the linear motor 41 is arranged on the bottom surface 12 of the cone cylinder 1, the first through hole 14 is arranged in the center of the bottom surface 12 of the cone cylinder 1, the lead screw is arranged in the first through hole 14 and extends to the top surface 13 of the cone cylinder 1 and protrudes from the position of the top surface 13, one end of the lead screw is connected with the linear motor 41, the nut is connected with the lead screw, and the push plate 31 is connected with the nut and is sleeved on the lead screw. The specific form of the driving part 4 can be selected adaptively according to actual needs, and the specific form is not limited.

[0063] As shown in Figures 2 to 4 some embodiments, a plurality of second through holes 121 are arranged on the bottom surface 12 around the first through hole 14, the axis of the second through hole 121 is parallel to the generatrix of the side surface of the cone cylinder 1, a bearing 122 is arranged in the second through hole 121, and the guide rod 22 is arranged in the bearing 122.

[0064] Specifically, in order to realize the guiding of the guide rod 22 and improve the stability of the structure, a plurality of second through holes 121 are arranged on the bottom surface 12 around the first through hole 14, the axis of the second through hole 121 is parallel to the generatrix of the side surface of the cone cylinder 1, so as to meet the placement condition that the guide rod 22 is parallel to the side surface of the cone cylinder 1, and to meet the requirement that the sensing assembly 21 detects the internal thread of the matching cone cylinder 1 along the guide rod 22. By arranging the bearing 122 in the second through hole 121, the guide rod 22 can smoothly slide under the support of the bearing 122, the guiding accuracy of the guide rod 22 is improved, and the arrangement of the bearing 122 also reduces the friction between the guide rod 22 and the second through hole 121, reduces the energy loss in the relative sliding process, improves the stability of the driving, and further improves the accuracy of the detection result.

[0065] In one embodiment, one end of the guide rod 22 close to the push plate 31 is fixedly connected with the sensing assembly 21, so that when the push plate 31 is driven by the driving part 4, the connecting piece 32 drives the sensing assembly 21 to move, the guide rod 22 is also driven to move relative to the cone cylinder 1, so that the guide rod 22 can slide relative to the bearing 122 arranged on the second through hole 121 opened on the bottom surface 12 of the cone cylinder 1, and the other end of the guide rod 22 can protrude from the side of the bottom surface 12 away from the push plate 31 without changing the angle, and the length of the protrusion is related to the movement stroke of the push plate 31.

[0066] As shown in Figure 3 some embodiments, the side of the sensing assembly 21 away from the connecting piece 32 has a target surface 211, and the target surface 211 is parallel to the side surface of the cone cylinder 1.

[0067] Specifically, the target surface 211 of the sensing assembly 21 away from the connecting piece 32 is parallel to the side surface of the cone 1, so as to ensure that the outer surface of the sensing assembly 21 keeps a fixed distance with the internal thread during sliding relative to the guide rod 22, so that the data measured when the sensing assembly 21 slides relative to the guide rod 22 to measure in the direction parallel to the internal thread path has comparability and repeatability, and when the internal thread has defects such as cracks, fatigue damage and stress concentration, the data collected by the sensing assembly 21 can accurately show fluctuations or abnormalities, thereby improving the accuracy and efficiency of the detection result. In the present application, the target surface 211 is parallel to the side surface of the cone 1, which means that the cross-sectional line of the target surface 211 is parallel to the cross-sectional line of the side surface of the cone 1 in a certain circumferential angle. It can be understood that, since the cross-sectional shape of the cone 1 in the radial direction is arc-shaped, the target surface 211 in the present application is also arc-shaped, so that the target surface 211 keeps the same distance with the internal thread in each circumferential angle.

[0068] In some embodiments, the sensing assembly 21 comprises a sensor box and a sensor, the sensor box has at least one first accommodating space therein, the first accommodating space accommodating the sensor; the first surface of one side of the sensor box is fixedly connected to the connecting piece 32; the second surface of the sensor box opposite to the first surface is provided with a limiting groove, and the limiting groove forms the first accommodating space; or, the second surface of the sensor box opposite to the first surface is provided with at least two protrusions, and the at least two protrusions enclose the first accommodating space.

[0069] Specifically, the sensing assembly 21 of the present application comprises a sensor box and a sensor, and the first surface of one side of the sensor box is fixedly connected to the connecting piece 32, which can be in the form of screwing, pinning, clamping, etc., and the specific form is not limited. In order to realize the placement of the sensor, the present application can be provided with a limiting groove on the second surface opposite to the first surface of the sensor box, so as to form a first accommodating space through the limiting groove to meet the placement requirements of the sensor, or at least two protrusions can be provided on the second surface, and the sensor can be stably placed through the clamping or enclosing effect of the protrusions.

[0070] For one sensor box, the present application can be provided with one or more sensors to realize multi-channel data acquisition. For example, when the number of sensor boxes is 8 and each sensor box accommodates 2 sensors, 16 channels of signal acquisition can be realized; when the number of sensor boxes is 12 and each sensor box accommodates 3 sensors, 36 channels of signal acquisition can be realized; other number of embodiments are not exemplified one by one, and the principle is the same. Through the increase of the number of sensor boxes and the number of sensors in each box, the detection tool can obtain data from more angles and positions, and multi-channel data acquisition can provide more dimensional information, which is helpful for more detailed data analysis and problem diagnosis, and is helpful for improving the accuracy and reliability of the detection result.

[0071] In some embodiments, the transmission assembly 3 further comprises a limiting block, which is clamped to one side of the second installation groove 311 close to the edge of the push disc 31, and is closer to the guide rod 22 close to the edge of the push disc 31.

[0072] Specifically, in order to improve the stability of the detection tool, the connecting piece 32 avoids the sensing assembly 21 or the guide rod 22 from being separated from the second installation groove 311 in the radial direction due to the vibration of the tool as a whole or external uncontrollable factors during the process of driving the sensing assembly 21 to reciprocate in the radial direction of the push disc 31 in the second installation groove 311, which leads to the absence of detection results and causes detection failure. The application sets a limiting block (not shown in the figure) in the transmission assembly 3, which is clamped to one side of the second installation groove 311 close to the edge of the push disc 31, and is closer to the guide rod 22 close to the edge of the push disc 31. The limiting block limits the guide rod 22 and the sensing assembly 21 on the side of the center of the push disc 31, so that the sensing assembly 21 can stably slide relative to the guide rod 22, thereby ensuring the accuracy of the detection results.

[0073] As shown in Figure 2 and Figure 4 In some embodiments, it further comprises a protective cover 5, which is arranged on the side of the bottom surface 12 away from the transmission assembly 3 and enclosed with the bottom surface 12 to form a second containing space, and the second containing space is used to place the linear motor 41.

[0074] Specifically, in order to protect the linear motor 41 from being polluted by dust, water vapor, oil stains and other pollutants, the application sets a protective cover 5 to protect the linear motor 41 on the side of the bottom surface 12 of the cone cylinder 1 away from the transmission assembly 3, thereby improving the reliability of the linear motor 41 and ensuring stable operation, so as to ensure that the push disc 31 can stably drive the sensing assembly 21 to perform detection work under the driving of the linear motor 41.

[0075] As shown in Figure 2 and Figure 4 In some embodiments, it further comprises a holding part 6, which is connected to the circumferential edge of the cone cylinder 1, and a control module is arranged in the holding part 6, and the control module is electrically connected to the driving part 4. The guide rod 22 is hollow inside and is provided with a signal line, and the two ends of the signal line are respectively connected to the sensing assembly 21 and the control module, so that the control module can obtain the data collected by the sensing assembly 21.

[0076] Specifically, in order to facilitate the detection personnel to detect the operation, carrying, placing and the like of the detection tool, the application is provided with a holding part 6 for the detection tool to provide physical support so that the detection personnel can hold the detection tool by hand, improving the convenience of the tool. And in order to realize the integration of the detection tool, the application is provided with a control module in the holding part 6 to realize the control of the driving part 4 through the control module to make the linear motor 41 forward or reverse rotation to meet the requirement of obtaining multiple sets of internal thread detection data. The application can be provided with multiple control buttons in the holding part 6, which can correspond to different motor driving directions respectively, and can also correspond to the preheating mode, standby mode, start and shutdown and the like of the detection tool, which is not limited in particular.

[0077] And the application also hollowly sets the guide rod 22, which on the one hand simplifies the wiring, reduces the number of external connections and interfaces of the detection tool, reduces the risk of failure and improves the stability of the system; on the other hand, the signal line is arranged inside the guide rod 22 to realize efficient transmission of the data collected by the sensing assembly 21 through wired signal transmission, reduce the delay and interference in the signal transmission process, and improve the accuracy and integrity of the detection result.

[0078] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0079] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be replaced equivalently without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A convenient automatic wellhead detection tool for fatigue condition of internal threads in deep well drilling tools, characterized in that, include: A cone (1) has a preset taper and a plurality of first mounting grooves (11) are evenly provided on the side of the cone (1) along the circumferential direction. The detection unit (2) includes multiple sensing components (21) and multiple guide rods (22). The sensing components (21) are slidably sleeved on the guide rods (22). The multiple guide rods (22) are evenly spaced along the circumference of the cone (1) and connected to the bottom surface (12) of the cone (1), and correspond one-to-one with the multiple first mounting slots (11). The guide rods (22) are parallel to the generatrix of the side of the cone (1). The transmission assembly (3) includes a push plate (31) and multiple connectors (32). The push plate (31) is coaxially arranged with the cone (1). Multiple second mounting slots (311) corresponding to the first mounting slot (11) are opened around the edge of the push plate (31). Multiple connectors (32) are slidably connected to multiple second mounting slots (311), and each connector (32) is connected to a sensing component (21). The connector (32) can carry the sensing component (21) and slide back and forth in the second mounting slot (311) along the radial direction of the push plate (31). The driving part (4) is connected to the bottom surface (12) of the cone (1) and the driving part (4) is connected to the push plate (31); The transmission assembly (3) has a switchable first relative position relationship and a second relative position relationship relative to the cone (1). In the first relative position relationship, the transmission assembly (3) is located on the top surface (13) side of the cone (1). The driving part (4) drives the push plate (31) to move the connecting piece (32) toward the cone (1). The connecting piece (32) drives the sensing assembly (21) to slide relative to the guide rod (22) so that the transmission assembly (3) relative to the cone (1) switches from the first relative position relationship to the second relative position relationship.

2. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, The connector (32) has a third mounting groove (321) which is slidably connected to the second mounting groove (311). The connector (32) is connected to the sensing component (21) on the side of the push plate (31) away from the bottom surface (12) of the cone (1).

3. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 2, characterized in that, The sensing component (21) has an arc-shaped cross section, wherein the outer diameter of the side of the sensing component (21) facing the push plate (31) is smaller than the outer diameter of the top surface (13) of the cone (1).

4. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, The drive unit (4) includes a linear motor (41) and a drive rod (42). The linear motor (41) is disposed on the bottom surface (12) of the cone (1). A first through hole (14) is provided at the center of the bottom surface (12) of the cone (1). The drive rod (42) passes through the first through hole (14) and extends towards the top surface (13) of the cone (1), and extends beyond the position of the top surface (13). One end of the drive rod (42) is connected to the linear motor (41). The push plate (31) is sleeved on the end of the drive rod (42) that extends beyond the top surface (13).

5. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 4, characterized in that, The bottom surface (12) is provided with a plurality of second through holes (121) spaced apart around the first through hole (14). The axis of the second through hole (121) is parallel to the generatrix of the side of the cone (1). A bearing (122) is provided in the second through hole (121), and the guide rod (22) passes through the bearing (122).

6. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, The sensing component (21) has a target surface (211) on the side opposite to the connector (32), and the target surface (211) is parallel to the side of the cone (1).

7. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, The sensing component (21) includes a sensor housing and a sensor, wherein the sensor housing has at least one first accommodating space for accommodating the sensor. The first side of one side of the sensor housing is fixedly connected to the connector (32); A limiting groove is provided on the second side of the sensor housing opposite to the first side, and the limiting groove forms the first accommodating space; Alternatively, at least two protrusions may be provided on the second side of the sensor housing opposite to the first side, and the at least two protrusions may form the first accommodating space.

8. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, The transmission assembly (3) further includes a limiting block, which is engaged with the second mounting groove (311) on the side near the edge of the push plate (31) and closer to the edge of the push plate (31) than the guide rod (22).

9. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, Also includes: The protective cover (5) is located on the side of the bottom surface (12) away from the transmission assembly (3) and forms a second accommodating space with the bottom surface (12). The second accommodating space is used to place the linear motor (41) in the drive unit (4).

10. The convenient automatic wellhead detection tool for fatigue state of internal threads in deep well drilling tools according to claim 1, characterized in that, Also includes: A gripping part (6) is connected to the cone (1). A control module is provided inside the gripping part (6), and the control module is electrically connected to the drive part (4). The guide rod (22) is hollow inside and has a signal line. The two ends of the signal line are connected to the sensing component (21) and the control module, respectively.

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