Fatigue crack detection device for oil casing

Abstract

The utility model relates to the technical field of oil casing detection, and discloses an oil casing fatigue crack detection device which comprises a base and a sliding rail frame, a servo motor is fixedly installed at the top of the base, and a worm is fixedly installed at one end of an output shaft of the servo motor. A clamping and fastening assembly used for clamping and positioning the oil casing is arranged in the middle of the sliding rail frame, and sealing detection assemblies used for blocking the two ends of the oil casing are arranged in the sliding rail frame and located on the two sides of the clamping and fastening assembly. The servo motor is started to drive the worm to rotate, then the worm gear connected with the worm in a meshed mode drives the two-way screw to rotate, the cross-shaped sliding blocks on the two sides can be driven to move relatively to be close, and then the plugs on the two sides can be close to each other and can be plugged into the two end openings of the oil casing pipe for sealing. And air is inflated into the oil sleeve through the air inlet pipe, so that whether cracks exist in the oil sleeve or not can be detected according to the change of air pressure, and accidents caused by the fact that defective goods are put into use are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil casing detection, in particular to an oil casing fatigue crack detection device. Background Art

[0002] The oil casing is the last layer of casing in the casing program of an oil and gas well, extending from the wellhead all the way down through the oil and gas layer. The depth at which the oil casing is lowered is basically the depth of the well drilling. Its function is to serve as a passage for oil and gas to reach the ground, isolate the oil and gas from all strata, and ensure that the oil and gas pressure does not leak.

[0003] As a pipeline for transporting oil and gas, it is necessary to ensure that the oil casing has good sealing performance. However, cracks may appear locally on the surface of the processed oil casing, which may lead to leakage accidents during the transportation of oil and gas. Therefore, it is necessary to detect the oil casing to avoid defective products being put into use and causing dangerous accidents. Therefore, further improvements can be made. Content of the Utility Model

[0004] To solve the above-mentioned problems, the utility model provides the following technical solution: an oil casing fatigue crack detection device, including a base and a slide rail frame. One end of the back of the base is fixedly installed with a support. The top of the base is fixedly installed with a servo motor. One end of the output shaft of the servo motor is fixedly installed with a worm, and the end of the worm away from the servo motor is rotatably connected to the top of the support. The middle part of the slide rail frame is provided with a clamping and fastening component for clamping and positioning the oil casing, and on both sides of the clamping and fastening component inside the slide rail frame, there are provided sealing and detection components for sealing both ends of the oil casing.

[0005] As an optimization, the clamping and fastening component includes a bracket fixedly installed on the top side of the middle part of the slide rail frame. Both ends of the bracket are fixedly installed with hollow blocks. Inside the hollow blocks, there is a fastening screw rotatably connected. Inside the hollow blocks, there is a limit slider slidably connected, and the limit slider is threadedly sleeved on the outside of the fastening screw. The top side of the limit slider is fixedly installed with a clamping plate. Both ends of the fastening screw are fixedly installed with turning handles. By turning the turning handles, the fastening screw can be driven to rotate inside the limit slider, and then the clamping plates on both sides can be driven to move relatively.

[0006] As an optimization, the clamping plate is made of spring steel and is arc-shaped, which is convenient for clamping the outside of oil casings with different diameters through the arc-shaped clamping plate.

[0007] As an optimization, a rubber pad is provided on the inner side of the clamping plate to avoid direct contact between the clamping plate and the oil casing and play a protective role.

[0008] As an optimization, the seal detection assembly includes a bidirectional screw rotatably connected inside the slide rail frame. Cross sliders are slidably connected to both sides inside the seal detection assembly, and the bidirectional screw is threadedly connected inside the cross sliders. A support plate is fixedly installed on the top side of the cross slider, a plug is fixedly installed on the top of the support plate, an air inlet pipe is fixedly inserted into the center of the plug, and a worm gear is fixedly installed in the middle of the bidirectional screw.

[0009] As an optimization, the plug is frustum-shaped, and a rubber pad is arranged on the outer side of the plug. The worm gear and the worm are meshed and connected. By starting the servo motor, the worm will be driven to rotate, and then the bidirectional screw will be driven to rotate through the worm gear meshed with the worm. Therefore, the cross sliders on both sides will be driven to slide relatively along the inner wall of the slide rail frame, and then the plugs on both sides will be driven to approach each other through the support plates and be inserted into the two ports of the oil casing, playing a sealing role for the oil casing.

[0010] As an optimization, two bearings are arranged on both sides of the worm gear in the middle of the bidirectional screw, and the bearings are installed inside the slide rail frame. The bearings can reduce the friction force during the rotation of the bidirectional screw and reduce wear and tear.

[0011] The beneficial effects of the present utility model are:

[0012] 1. For this oil casing fatigue crack detection device, by starting the servo motor to drive the worm to rotate, then the bidirectional screw will be driven to rotate through the worm gear meshed with the worm. Therefore, the cross sliders on both sides will be driven to move relatively closer, and then the plugs on both sides will approach each other, so they will be inserted into the two ports of the oil casing for sealing. Then, air is inflated into the oil casing through the air inlet pipe, and thus it can be detected whether there are crack gaps in the oil casing according to the change of air pressure, avoiding accidents caused by defective products being put into use.

[0013] 2. For this oil casing fatigue crack detection device, by turning the turning handle, the fastening screw will be driven to rotate inside the limit slider. Therefore, the limit sliders on both sides will be driven to move relatively closer, and then the clamping plates on both sides will be driven to clamp on the outer side of the oil casing, so as to clamp and fix the oil casing, thus facilitating the clamping and fixing of oil casings with different diameters and improving applicability. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model;

[0015] Figure 2 It is a schematic structural diagram of another perspective of the present utility model;

[0016] Figure 3 It is a schematic structural diagram of the clamping and fastening structure of the present utility model;

[0017] Figure 4This is a schematic diagram of the sealing detection structure of the utility model.

[0018] In the figure: 1, base; 2, slide rail frame; 3, support; 4, servo motor; 5, worm; 6, clamping and fastening assembly; 7, sealing detection assembly; 8, bracket; 9, hollow block; 10, fastening screw; 11, limit slider; 12, clamping plate; 13, turning handle; 14, bidirectional screw; 15, cross slider; 16, support plate; 17, plug; 18, intake pipe; 19, worm gear. Specific embodiments

[0019] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and 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 therefore should not be construed as a limitation to this application.

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figure 1-2 , the oil casing fatigue crack detection device, including a base 1 and a slide rail frame 2. One end of the back of the base 1 is fixedly installed with a support 3, the top of the base 1 is fixedly installed with a servo motor 4, one end of the output shaft of the servo motor 4 is fixedly installed with a worm 5, and the end of the worm 5 away from the servo motor 4 is rotatably connected to the top of the support 3. A clamping and fastening assembly 6 for clamping and positioning the oil casing is arranged in the middle of the slide rail frame 2, and sealing detection assemblies 7 for blocking both ends of the oil casing are arranged on both sides of the clamping and fastening assembly 6 inside the slide rail frame 2;

[0022] Please refer to Figure 3 , the clamping and fastening assembly 6 includes a bracket 8 fixedly installed on the top side of the middle of the slide rail frame 2. Hollow blocks 9 are fixedly installed at both ends of the bracket 8. A fastening screw 10 is rotatably connected inside the hollow block 9. A limit slider 11 is slidably connected inside the hollow block 9, and the limit slider 11 is threadedly sleeved on the outside of the fastening screw 10. A clamping plate 12 is fixedly installed on the top side of the limit slider 11. The clamping plate 12 is made of spring steel and is arc-shaped, and it is convenient to clamp the outside of oil casings with different diameters through the arc-shaped clamping plate 12;

[0023] Please refer to Figure 3 , rotating handles 13 are fixedly installed at both ends of the fastening screw rod 10. By rotating the rotating handle 13, the fastening screw rod 10 can be driven to rotate inside the limit slider 11, and then the clamping plates 12 on both sides can be driven to move relatively, so as to facilitate the clamping and fixing of oil casing pipes with different diameters, improving applicability. A rubber pad is provided on the inner side of the clamping plate 12 to prevent the clamping plate 12 from directly contacting the oil casing pipe through the rubber pad, playing a protective role;

[0024] Please refer to Figure 2 and Figure 4 , the seal detection assembly 7 includes a bidirectional screw rod 14 rotatably connected inside the slide rail frame 2. Cross sliders 15 are slidably connected to both sides inside the seal detection assembly 7, and the bidirectional screw rod 14 is threadedly connected inside the cross sliders 15. A support plate 16 is fixedly installed on the top side of the cross slider 15, and a plug 17 is fixedly installed on the top of the support plate 16. The plug 17 is frustum-shaped, and a rubber pad is provided on the outside of the plug 17. An air inlet pipe 18 is fixedly inserted into the center of the plug 17. A worm gear 19 is fixedly installed in the middle of the bidirectional screw rod 14, and the worm gear 19 is meshed with the worm 5. By starting the servo motor 4, the worm 5 can be driven to rotate, and then the bidirectional screw rod 14 can be driven to rotate through the worm gear 19 meshed with the worm 5. Therefore, the cross sliders 15 on both sides can be driven to slide relatively along the inner wall of the slide rail frame 2, and then the plugs 17 on both sides can be driven to approach each other through the support plate 16 and be inserted into the two end ports of the oil casing pipe, playing a sealing role for the oil casing pipe. Then, by inflating the oil casing pipe through the air inlet pipe 18, it is possible to detect whether there are crack gaps in the oil casing pipe according to the air pressure change;

[0025] Please refer to Figure 4 , two bearings are provided in the middle of the bidirectional screw rod 14 and on both sides of the worm gear 19, and the bearings are installed inside the slide rail frame 2. The bearings can reduce the friction force when the bidirectional screw rod 14 rotates and reduce wear and tear.

[0026] During use, first place the oil casing pipe between the clamping plates 12 on both sides, and then rotate the rotating handle 13 to drive the fastening screw rod 10 to rotate inside the limit slider 11. Then, the limit sliders 11 on both sides will be driven to approach relatively, so that the clamping plates 12 on both sides will clamp on the outside of the oil casing pipe, thus clamping and fixing the oil casing pipe;

[0027] After that, by starting the servo motor 4, the worm 5 will be driven to rotate. Therefore, the bidirectional screw rod 14 will be driven to rotate through the worm gear 19 meshed with the worm 5. Then, the cross sliders 15 on both sides will be driven to approach relatively. So, the plugs 17 will be driven to approach each other through the support plate 16 and be inserted into the two end ports of the oil casing pipe, and then the oil casing pipe will be sealed and blocked. After that, the oil casing pipe can be inflated through the air inlet pipe 18, and then it is possible to detect whether there are crack gaps in the oil casing pipe according to the change in air pressure.

[0028] In summary, for the fatigue crack detection device of the casing pipe, starting the servo motor 4 drives the worm 5 to rotate. Subsequently, the worm gear 19 meshed with the worm 5 drives the bidirectional screw 14 to rotate. As a result, the cross sliders 15 on both sides move relatively closer to each other, causing the plugs 17 on both sides to approach each other and then be inserted into the two ends of the casing pipe for sealing. Then, air is inflated into the casing pipe through the air inlet pipe 18. Thus, it is possible to detect whether there are crack gaps in the casing pipe based on the change in air pressure, avoiding accidents caused by defective products being put into use.

[0029] By turning the turning handle 13, the fastening screw 10 rotates inside the limit slider 11. Therefore, the limit sliders 11 on both sides move relatively closer to each other, and then drive the clamping plates 12 on both sides to clamp on the outer side of the casing pipe, thereby clamping and fixing the casing pipe. This facilitates the clamping and fixing of casing pipes with different diameters and improves the applicability.

[0030] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "set", "install", "connect", "join", "fix" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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 utility model can be understood according to specific circumstances.

[0031] The standard parts used in the present utility model can all be purchased from the market, and the special-shaped parts can be customized according to the records in the specification and the drawings.

[0032] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent replacements or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. An oil casing fatigue crack detection device, comprising a base (1) and a slide rail frame (2), characterized in that: A support (3) is fixedly mounted on one end of the back side of the base (1), a servo motor (4) is fixedly mounted on the top of the base (1), a worm (5) is fixedly mounted on one end of the output shaft of the servo motor (4), and the end of the worm (5) away from the servo motor (4) is rotatably connected to the top of the support (3), a clamping and fastening assembly (6) for clamping and positioning the oil casing is arranged in the middle of the slide rail frame (2), and a sealing detection assembly (7) for sealing both ends of the oil casing is arranged inside the slide rail frame (2) and on both sides of the clamping and fastening assembly (6).

2. The oil casing fatigue crack detection device according to claim 1, characterized in that: The clamping and fastening assembly (6) comprises a bracket (8) fixedly mounted on the top side of the middle part of the slide rail frame (2), hollow blocks (9) are fixedly mounted on both ends of the bracket (8), a fastening screw (10) is rotatably connected inside the hollow block (9), a limiting slider (11) is slidably connected inside the hollow block (9), and the limiting slider (11) is threadedly sleeved on the outside of the fastening screw (10), a clamping plate (12) is fixedly mounted on the top side of the limiting slider (11), and a rotating handle (13) is fixedly mounted on both ends of the fastening screw (10).

3. The oil casing fatigue crack detection device according to claim 2 is characterized in that: The clamping plate (12) is made of spring steel, and the clamping plate (12) is arc-shaped.

4. The oil casing fatigue crack detection device according to claim 3 is characterized in that: A rubber pad is provided on the inner side of the clamping plate (12).

5. The oil casing fatigue crack detection device according to claim 1, characterized in that: The sealing detection component (7) comprises a bidirectional screw (14) rotatably connected to the inside of the slide rail frame (2), a cross slider (15) is slidably connected to both sides of the inside of the sealing detection component (7), and the bidirectional screw (14) is threadedly screwed inside the cross slider (15), a support plate (16) is fixedly installed on the top side of the cross slider (15), a plug (17) is fixedly installed on the top of the support plate (16), an air intake pipe (18) is fixedly inserted in the center of the plug (17), and a worm gear (19) is fixedly installed in the middle of the bidirectional screw (14).

6. The oil casing fatigue crack detection device according to claim 5, characterized in that: The plug (17) is in a truncated cone shape, and a rubber pad is provided on the outside of the plug (17). The worm wheel (19) and the worm (5) are meshingly connected.

7. The oil casing fatigue crack detection device according to claim 5, characterized in that: Two bearings are provided in the middle of the bidirectional screw (14) and on both sides of the worm wheel (19), and the bearings are installed inside the slide rail frame (2).

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