Device and method for detecting residual stress of petroleum drilling tool

Abstract

The invention relates to a device and method for detecting residual stress of a petroleum drilling tool, and the device is matched with an external ultrasonic generation device for use, and comprises a body. The body is suitable for being placed on the surface of a thread area of a petroleum drilling tool. The body can transmit ultrasonic waves to the bottom of a thread of the petroleum drilling tool; the body is suitable for transmitting ultrasonic waves when the thread residual stress of a petroleum drilling tool is detected through an ultrasonic critical refraction longitudinal wave method, and therefore residual stress distribution is recognized. And aiming at the special shape of the drilling tool thread, a point-by-point calibration mode is adopted to ensure the accuracy of each detection point.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling tool regulation, and particularly relates to a residual stress detection device and detection method for oil drilling tools. Background Art

[0002] During the production and use of oil drilling tools, due to factors such as processing, welding, or inevitable internal stresses in materials, residual stresses will be generated inside the drilling tools. If these residual stresses cannot be controlled in time, they may have a serious impact on the service performance and safety of the drilling tools. Especially in the tapered thread part of the drilling tool, these residual stresses are prone to cause stress concentration, which may further lead to faults such as cracking and fracture of the thread part. Especially in high-pressure, high-temperature, and complex geological environments, the drilling tool will be affected by unpredictable pulsating alternating loads during operation, which exacerbates the risk of damage to the thread part.

[0003] Particularity of the thread part of the drilling tool: The tapered thread of the drilling tool is the most stressed and worn part. Due to the special shape of the thread, during the use of the tapered thread, especially at the root of the tooth, large stress concentration is likely to occur. During the processing of the thread part, affected by metal deformation, cutting force, and internal defects of the material, there are often certain residual stresses. The existence of these residual stresses, if not regulated in time, will directly affect the mechanical properties of the drilling tool, resulting in cracking or even fracture at the root of the tooth, thus affecting the efficiency and safety of the drilling operation.

[0004] Currently, traditional residual stress detection methods are difficult to accurately identify and quantify the residual stresses at each detection point. Summary of the Invention

[0005] In view of this, the present application provides a residual stress detection device and detection method for oil drilling tools, which solves the problem that traditional residual stress detection methods are difficult to accurately identify and quantify the residual stresses at each detection point.

[0006] A residual stress detection device for an oil drilling tool, which is used in cooperation with an external ultrasonic generating device, includes a body; the body is suitable for being placed on the surface of the thread area of the oil drilling tool; the body can transmit ultrasonic waves to the bottom of the thread of the oil drilling tool; the body is suitable for transmitting ultrasonic waves when detecting the residual stress of the thread of the oil drilling tool by the ultrasonic critical refraction longitudinal wave method.

[0007] In a possible implementation manner, the body is in a long strip shape, and the length matches the length in the direction perpendicular to the thread in the thread area of the oil drilling tool; and the body has a preset thickness, and both sides in the length direction of the top are wedge-shaped.

[0008] In a possible implementation, a groove matching the thread of the threaded area of the oil drilling tool is provided at the bottom of the body.

[0009] In a possible implementation, a plurality of through holes are provided on the body, and the through holes are evenly arranged along the length direction of the body.

[0010] In a possible implementation, one through hole penetrates the top and the bottom of the body; two through holes are provided on the wedge-shaped surfaces on both sides in the length direction of the top of the body and penetrate the wedge-shaped surface and the bottom of the body.

[0011] In a possible implementation, using the above-mentioned residual stress detection device for the oil drilling tool to detect the threaded area of the oil drilling tool to be detected includes the following steps: dividing the threaded area of the oil drilling tool to be detected to obtain a plurality of detection areas; placing the matching detection device in the detection area; using an ultrasonic emission device to output ultrasonic waves to the detection device; analyzing the returned ultrasonic data, and judging whether there is residual stress in the threaded area of the oil drilling tool to be detected according to the analysis result.

[0012] In a possible implementation, the threaded area of the oil drilling tool to be detected is divided, and each divided area is numbered.

[0013] In a possible implementation, a groove matching the thread of the threaded area of the oil drilling tool is provided at the bottom of the body of the detection device. Placing the matching detection device in the detection area for detection includes: judging the thread of the threaded area of the oil drilling tool to be detected, placing the groove at the bottom of the detection device parallel to the thread of the threaded area of the oil drilling tool to be detected, and using the same-direction detection method for detection; or, placing the groove at the bottom of the detection device perpendicular to the thread of the threaded area of the oil drilling tool to be detected, and using the cross-thread detection method for detection.

[0014] In a possible implementation, it further includes: comparing the returned ultrasonic data with the preset zero-stress ultrasonic data, and judging whether there is residual stress in the threaded area of the oil drilling tool to be detected according to the analysis result.

[0015] In a possible implementation, it further includes detecting the inner hole of the oil drilling tool to be detected; wherein, it includes circumferential direction detection: performing ultrasonic detection along the circumferential direction of the inner hole; and generatrix direction detection: performing ultrasonic detection along the generatrix direction of the inner hole.

[0016] Advantages of the present invention: By providing a main body which is arranged on the thread area of the petroleum drill to be detected and is completely fitted with the threads in the thread area of the petroleum drill to be detected, the residual stress of the threads of the petroleum drill is detected by the ultrasonic critically refracted longitudinal wave method. Description of the Drawings

[0017] Figure 1 A comprehensive schematic diagram showing the co-directional detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0018] Figure 2 A top view showing the co-directional detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0019] Figure 3 A side view showing the co-directional detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0020] Figure 4 A front view showing the co-directional detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0021] Figure 5 A comprehensive schematic diagram showing the cross-thread detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0022] Figure 6 A top view showing the cross-thread detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0023] Figure 7 A front view showing the cross-thread detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0024] Figure 8 A side view showing the cross-thread detection method of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0025] Figure 9 A cross-sectional view showing the detection in the direction of the inner hole bus of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0026] Figure 10 A front view showing the detection in the direction of the inner hole bus of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0027] Figure 11 A side view showing the detection in the direction of the inner hole bus of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0028] Figure 12 A top view showing the detection in the direction of the inner hole bus of the residual stress detection method for petroleum drills in the embodiments of the present application;

[0029] Figure 13 A cross-sectional view showing the circumferential detection of the inner hole of the residual stress detection method for oil drilling tools according to an embodiment of the present application;

[0030] Figure 14 A front view showing the circumferential detection of the inner hole of the residual stress detection method for oil drilling tools according to an embodiment of the present application;

[0031] Figure 15 A side view showing the circumferential detection of the inner hole of the residual stress detection method for oil drilling tools according to an embodiment of the present application;

[0032] Figure 16 A top view showing the circumferential detection of the inner hole of the residual stress detection method for oil drilling tools according to an embodiment of the present application. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Examples of the embodiments are shown in the accompanying drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0037] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "joined", "fixed", "engaged", "hinged", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] As Figures 1 to 16 shown, the residual stress detection device for the oil drilling tool is used in cooperation with an external ultrasonic generating device and includes a body 100; the body 100 is adapted to be placed on the surface of the threaded area 200 of the oil drilling tool; the body 100 can transmit ultrasonic waves to the bottom of the thread of the oil drilling tool; the body 100 is adapted to transmit ultrasonic waves when detecting the residual stress of the thread of the oil drilling tool by the ultrasonic critical refraction longitudinal wave method. The body 100 is in a long strip structure, and its length matches the length of the threaded area 200 of the oil drilling tool in the direction perpendicular to the thread; and the body 100 has a preset thickness, and both sides in the length direction of the top are wedge-shaped. A groove matching the thread of the threaded area 200 of the oil drilling tool is provided at the bottom of the body 100. A plurality of through holes are provided on the body 100, and the through holes are uniformly arranged along the length direction of the body 100. One through hole penetrates through the top and the bottom of the body 100; two through holes are provided on the wedge-shaped surfaces on both sides in the length direction of the top of the body 100, penetrating through the wedge surface and the bottom of the body 100.

[0039] Specifically, traditional residual stress detection methods, especially for threaded parts, face the following challenges: Complex geometry of the thread: Tapered threads usually have complex geometric features such as variable curvature, variable diameter, and variable angle, which makes it difficult for standard detection techniques to accurately identify and quantify the residual stress at each detection point, especially in the stress concentration area at the root of the tooth. Detection requirements for multiple points and multiple directions: The root of the tooth of the thread requires refined and multi-point detection, while traditional detection methods can often only scan in a limited single direction and cannot comprehensively reflect the complex stress distribution on the thread surface. In order to accurately identify and quantify the residual stress at each detection point and perform refined and multi-point detection at the root of the tooth of the thread, a body 100 is provided. The body 100 is suitable for being placed on the surface of the threaded area 200 of the oil drilling tool; the body 100 can transmit ultrasonic waves to the bottom of the thread of the oil drilling tool; the body 100 is suitable for transmitting ultrasonic waves when detecting the residual stress of the thread of the oil drilling tool by the ultrasonic critically refracted longitudinal wave method. In order to better detect the residual stress at the root of the tooth, a groove matching the thread of the threaded area 200 of the oil drilling tool is provided at the bottom of the body 100, and there are multiple grooves, and the multiple grooves match the thread of the threaded area 200 of the oil drilling tool, so that the body 100 is completely attached to the thread of the threaded area 200 of the oil drilling tool. The setting direction of the groove at the bottom of the body 100 is parallel to the thread of the threaded area 200 of the oil drilling tool. This detection method is the same-direction detection method to ensure full contact between the body 100 and the root of the tooth and detect the residual stress at the root of the tooth between adjacent two threads. The setting direction of the groove at the bottom of the body 100 is perpendicular to the thread of the threaded area 200 of the oil drilling tool. This detection method is the cross-thread detection method for detecting the residual stress between the roots of multiple threads. Such a setting method can more comprehensively detect the residual stress at the root of the tooth.

[0040] A method for detecting the residual stress of an oil drilling tool, which uses the above-mentioned residual stress detection device for the oil drilling tool to detect the threaded area 200 of the oil drilling tool to be detected, including the following steps: dividing the threaded area 200 of the oil drilling tool to be detected to obtain multiple detection areas; placing a matching detection device (body 100) in the detection area; using an ultrasonic emission device to output ultrasonic waves to the detection device; analyzing the returned ultrasonic data, and judging whether there is residual stress in the threaded area of the oil drilling tool to be detected according to the analysis result.

[0041] Specifically, due to the complexity of the shape of the thread area 200 of the oil drilling tool to be detected, it is necessary to divide the thread area 200 of the oil drilling tool to be detected before detection, and make corresponding detection bodies 100 according to the shape characteristics of each area. Then, ultrasonic waves are emitted by the ultrasonic emission device, and the detection device receives the ultrasonic waves and starts to detect the corresponding detection area. After the detection, the detection device returns the obtained data, and then the returned data is analyzed to judge whether there is residual stress in the thread area of the oil drilling tool to be detected.

[0042] In a possible implementation, the thread area 200 of the oil drilling tool to be detected is divided, and each divided area is numbered. The threads in each area should be numbered to facilitate later detection and positioning.

[0043] In a possible implementation, a groove matching the thread of the thread area 200 of the oil drilling tool is provided at the bottom of the body 100 of the detection device. When detecting in the detection area, a matching detection device (body 100) is placed for detection, including: judging the thread of the thread area 200 of the oil drilling tool to be detected, placing the groove at the bottom of the detection device parallel to the thread of the thread area of the oil drilling tool to be detected, and detecting by the same-direction detection method; or, placing the groove at the bottom of the detection device perpendicular to the thread of the thread area of the oil drilling tool to be detected, and detecting by the cross-thread detection method.

[0044] Specifically, the bottom part of the tooth root of the thread area 200 of the oil drilling tool to be detected is the part most likely to crack, so this area is the key point for residual stress detection. According to the different shapes of the threads, the following two detection methods are adopted: The same-direction detection method: Place the body 100 parallel to the thread to ensure that the groove at the bottom of the body 100 is in full contact with the tooth root, and detect the residual stress of the tooth root between two adjacent threads. The cross-thread detection method: Place the groove at the bottom of the body 100 perpendicular to the thread to detect the residual stress between the tooth roots of multiple threads.

[0045] In a possible implementation, it further includes: comparing the returned ultrasonic data with the preset zero-stress ultrasonic data, and judging whether there is residual stress in the thread area of the oil drilling tool to be detected according to the analysis result.

[0046] Specifically, compare the returned ultrasonic data with the preset zero-stress ultrasonic data. By the time difference method of sound velocity, the sound velocity slows down under tensile stress and speeds up under compressive stress. When detecting, a zero-stress test block is used as a reference, and according to the national standard of GBT32073, judge whether there is residual stress in the thread area of the oil drilling tool to be detected.

[0047] In a possible implementation, it further includes the detection of the inner hole of the oil drill to be detected; wherein, it includes circumferential direction detection: performing ultrasonic detection along the circumferential direction of the inner hole; and generatrix direction detection: performing ultrasonic detection along the generatrix direction of the inner hole.

[0048] Specifically, as shown in the figure, since the oil drill to be detected needs to be detected in all aspects, it is also necessary to detect the residual stress of the inner hole of the oil drill to be detected. There are also two methods for detecting the residual stress of the inner hole of the oil drill to be detected. One is circumferential direction detection: performing ultrasonic detection along the circumferential direction of the inner hole; the other is generatrix direction detection: performing ultrasonic detection along the generatrix direction of the inner hole. Through these two methods, the residual stress of the inner hole of the oil drill to be detected can be comprehensively detected.

[0049] In a possible implementation, high-energy sound waves are generated by the ultrasonic transducer of the residual stress regulation device of the external oil drill to precisely regulate the detection area. When the residual stress value exceeds the set value of the yield strength, the residual stress is regulated by adjusting the frequency and power of the high-energy sound beam.

[0050] Specifically, first divide the threaded area 200 of the oil drill to be detected into multiple small areas and write the corresponding numbers. Clamp the body 100 on the area to be detected and record the numbers. Send ultrasonic waves through the external ultrasonic generating device, conduct the ultrasonic waves to the root of the thread teeth through the body 100, and use the ultrasonic critically refracted longitudinal wave method to detect the residual stress of the corresponding area. Then, high-energy sound waves are generated by the ultrasonic transducer of the residual stress regulation device of the external oil drill to precisely regulate the detection area. When the residual stress value exceeds the set value of the yield strength, the residual stress is regulated by adjusting the frequency and power of the high-energy sound beam.

[0051] This application uses the ultrasonic critically refracted longitudinal wave method for residual stress detection. This method detects the ultrasonic waves at the threaded part of the drill, and uses the difference in the propagation speed of ultrasonic waves in different stress areas to identify the residual stress distribution. For the special shape (variable curvature, variable diameter, variable angle) of the drill thread, the point-by-point calibration method is adopted to ensure the accuracy of each detection point.

[0052] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and its concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A residual stress detection device for oil drilling tools, which is used in cooperation with an external ultrasonic generating device, is characterized in that Comprising a body; The body is adapted to be placed on the surface of the threaded area of an oil drilling tool; the body is capable of transmitting ultrasonic waves to the bottom of the threads of the oil drilling tool; the body is adapted to transmit ultrasonic waves when detecting the residual stress of the threads of the oil drilling tool by the ultrasonic critical refraction longitudinal wave method.

2. The residual stress detection device for oil drilling tools according to claim 1, wherein The body is of a long strip structure, and the length matches the length in the direction perpendicular to the threads in the threaded area of the oil drilling tool; and the body has a preset thickness, and both sides in the length direction of the top are wedge-shaped.

3. The residual stress detection device for oil drilling tools according to claim 2, wherein, A groove matching the threads in the threaded area of the oil drilling tool is provided at the bottom of the body.

4. The residual stress detection device for oil drilling tools according to any one of claims 1-3, characterized in that, A plurality of through holes are provided on the body, and the through holes are evenly arranged along the length direction of the body.

5. The residual stress detection device for oil drilling tools according to claim 4, wherein, One of the through holes penetrates through the top and the bottom of the body. Two of the through holes are provided on the wedge-shaped surfaces on both sides in the length direction of the top of the body and penetrate through the wedge-shaped surfaces and the bottom of the body.

6. A method for detecting the residual stress of an oil drilling tool, characterized in that, Using the residual stress detection device for an oil drilling tool according to any one of claims 1-5 to detect the threaded area of the oil drilling tool to be detected, comprising the following steps: Dividing the threaded area of the oil drilling tool to be detected to obtain a plurality of detection areas; Placing the matching detection device in the detection area; Using an ultrasonic emission device to output ultrasonic waves to the detection device; Analyzing the returned ultrasonic data, and judging whether there is residual stress in the threaded area of the oil drilling tool to be detected according to the analysis result.

7. The method for detecting the residual stress of an oil drilling tool according to claim 6, characterized in that, Dividing the threaded area of the oil drilling tool to be detected and numbering each divided area.

8. The method for detecting the residual stress of an oil drilling tool according to claim 7, characterized in that, A groove matching the threads in the threaded area of the oil drilling tool is provided at the bottom of the body of the detection device, and placing the matching detection device in the detection area for detection includes: Judging the threads in the threaded area of the oil drilling tool to be detected, placing the groove at the bottom of the detection device parallel to the threads in the threaded area of the oil drilling tool to be detected, and detecting by the same-direction detection method; Or, placing the groove at the bottom of the detection device perpendicular to the threads in the threaded area of the oil drilling tool to be detected, and detecting by a cross-thread detection method.

9. The method for detecting the residual stress of an oil drilling tool according to claim 8, wherein, Further comprising: Comparing the returned ultrasonic data with preset zero-stress ultrasonic data, and judging whether there is residual stress in the threaded area of the oil drilling tool to be detected according to the analysis result.

10. The method for detecting the residual stress of an oil drilling tool according to claim 9, wherein Further comprising detecting the inner hole of the oil drilling tool to be detected; Wherein, it includes circumferential direction detection: performing ultrasonic detection along the circumferential direction of the inner hole; And generatrix direction detection: performing ultrasonic detection along the generatrix direction of the inner hole.

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