A leak-off tool for a pipe

Abstract

The utility model relates to a kind of leak stoppage tools for pipeline, it includes fixed subassembly and leak stoppage subassembly;Fixed subassembly includes fixed main body, and the arc portion connected in the one side of fixed main body;Arc portion is curved and arches relative to the axial direction of leakage pipeline;Part of structure of leak stoppage subassembly is worn on arc portion;The first end of leak stoppage subassembly is located in the inside of arc portion, for plugging the leakage point of leakage pipeline, its second end is located in the outside of arc portion, to provide basis for adjusting the position of first end;Leak stoppage subassembly further has pressure holding block;The side surface of pressure holding block is used for with the inside surface of arc portion is fitted;Arc portion is configured to press pressure holding block on leakage pipeline, to fix leak stoppage subassembly.This leak stoppage tool can reliably plug the leakage point of leakage pipeline in non straight pipe section.

Description

Technical Field

[0001] This utility model relates to the field of pipeline maintenance, and in particular to a leak-sealing tool for pipelines. Background Technology

[0002] In oil and gas extraction, pipelines often develop pinhole leaks due to aging and corrosion. For leaks in straight pipe sections, conventional plugging tools can usually be used for online repair.

[0003] However, when the leak point is located in a non-straight pipe section, such as at the flange-to-pipe weld, conventional online leak sealing tools are difficult to use effectively due to the high-pressure environment inside the pipe and the curved structure of the pipe body, or they are prone to causing secondary leaks. Currently, the main approach is to replace or repair the pipeline after production shutdown, which is time-consuming, labor-intensive, and the direct economic losses caused by production shutdown seriously affect the efficiency of oil and gas extraction. Utility Model Content

[0004] This invention aims to solve the problem that current leak-sealing tools are not suitable for non-straight pipe sections, and provides an improved leak-sealing tool for pipelines.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a leak-sealing tool for pipelines, including a fixing component and a leak-sealing component; The fixing assembly includes a fixing body for fixing to the leaking pipe, and an arc-shaped portion connected to one side of the fixing body; the arc-shaped portion is configured to be curved and arched relative to the axial direction of the leaking pipe. A portion of the structure of the leak-sealing component passes through the arc-shaped portion; the leak-sealing component has a first end and a second end opposite to each other, the first end being located inside the arc-shaped portion for sealing the leak point of the leaking pipe, and the second end being located outside the arc-shaped portion for providing a basis for adjusting the position of the first end; The leak-sealing assembly also has a holding block disposed inside the arc-shaped portion; one side surface of the holding block is used to fit against the inner surface of the arc-shaped portion; the arc-shaped portion is configured to press the holding block onto the leaking pipe to fix the leak-sealing assembly.

[0006] In some embodiments, the arcuate portion has a fixed side and a free side, the fixed side being fixedly connected to the fixed body, and the free side being located circumferentially outside the fixed body.

[0007] In some embodiments, the arc-shaped portion is provided with a through-hole; the pressing block is an arc-shaped structure, with its two ends located on both sides of the through-hole along the length direction of the arc-shaped portion.

[0008] In some embodiments, the width of the holding block is smaller than the width of the arcuate portion.

[0009] In some embodiments, a slider is provided on one side surface of the holding block facing the arcuate portion; The arc-shaped portion is provided with a groove for serving as the through-hole, and its extension direction is configured to be parallel to the axial direction of the leaking pipe; the slider is disposed in the groove and can move in the groove to support the movement of the pressure block within a defined range.

[0010] In some embodiments, the groove extends through the wall thickness of the arcuate portion to be formed on the arcuate portion; Alternatively, the arcuate portion may include two small arcuate elements arranged at intervals, with the interval between the two small arcuate elements forming the groove.

[0011] In some embodiments, the fixing body includes a clamp, which includes at least two arc-shaped clamps and an adjusting bolt connecting adjacent arc-shaped clamps; the at least two arc-shaped clamps are connected end to end to form a ring structure for surrounding the leaking pipe, and the adjusting bolt shortens the distance between adjacent arc-shaped clamps.

[0012] In some embodiments, the leak-sealing assembly includes a mounting base and a leak-sealing rod for sealing the leak point; The main body of the mounting base is located inside the arc-shaped portion, forming the pressure block; the mounting base also has an installation channel, and the plugging rod is inserted into and screwed into the installation channel.

[0013] In some embodiments, one end of the plugging rod is located on the side of the pressing block opposite to the arc-shaped portion, and is provided with a plugging surface; a sealing ring is provided on the outer circumferential direction of the plugging surface.

[0014] In some embodiments, the plugging rod further has another end located on the opposite side of the plugging surface, the other end of the plugging rod being disposed on the outside of the arcuate portion and configured to be connected to an external tool.

[0015] The following are the beneficial effects of implementing this utility model: This leak-sealing tool can be fixedly installed at the straight section of the leaking pipeline by the fixed body, and by using the arc-shaped part, the sealing end of the leak-sealing component can be extended to the leak point of non-straight pipe sections such as elbows, diameter changes or flange roots, and can be consistent with the normal direction of the leak point, so that the leak-sealing component can be vertically pressed against the leak point, avoiding the problem that the leak-sealing tool cannot exert force or is easy to slip off due to changes in the curvature of the pipeline. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a leak-sealing tool according to an embodiment of the present invention applied to a leaking pipeline; Figure 2 yes Figure 1 The cross-sectional view of the structure shown is obtained by cutting along the axial direction of the leaking pipe. Figure 3 yes Figure 2 A magnified view of a portion of the image; Figure 4 This is a structural schematic diagram of a single arc-shaped hoop in one embodiment of the present invention; wherein, the arc-shaped part is fixedly connected to one side of the arc-shaped hoop; Figure 5 This is a schematic diagram of the mounting base in one embodiment of the present invention; Figure 6 This is a schematic diagram of the plugging rod in one embodiment of the present invention; Figure 7 yes Figure 5 The cross-sectional view of the plugging rod is shown by cutting it along its axial direction.

[0017] Reference numerals: Fixing component 1; Fixing body 11; Arc-shaped part 12; Slide groove 121; Leak-stopping component 2; Leak-stopping rod 21; Leak-stopping surface 211; Sealing ring mounting groove 212; Assembly hole 213; Mounting seat 22; Pressing block 221; Slider 222; Installation channel 223; Leakage pipe 3; Leakage point 31. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0019] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0021] For reference Figures 1-3 This utility model constructs a leak-sealing tool for pipelines, which mainly includes a fixing component 1 and a leak-sealing component 2.

[0022] See Figure 2 The fixing assembly 1 includes a fixing body 11 for mounting on the leaking pipe 3, and an arcuate portion 12 connected to one side of the fixing body 11. The arcuate portion 12 is configured to be curved and arched relative to the axial direction of the leaking pipe 3.

[0023] Part of the leak-sealing component 2 is inserted into the arc-shaped portion 12. (See reference...) Figure 3 The leak-sealing component 2 has a first end and a second end. The first end of the leak-sealing component 2 is located inside the arc-shaped portion 12 and is used to seal the leak point 31 of the leaking pipe 3; the second end of the leak-sealing component 2 is located outside the arc-shaped portion 12 and provides a basis for adjusting the position of the leak-sealing component 2. The leak-sealing component 2 also has a pressure block 221 located inside the arc-shaped portion 12 (please refer to...). Figure 5(See reference), the holding block 221 has a surface facing the arcuate portion 12, which is used to fit against the inner surface of the arcuate portion 12; the arcuate portion 12 presses the holding block 221 onto the leaking pipe 3 to fix the leak-sealing assembly 2 relative to each other.

[0024] It can be noted that this leak-sealing tool is designed for areas where the main body 11 cannot be directly installed, such as elbows, reducers, or flange roots. It uses the arc-shaped part 12 to overcome obstacles and extend the point of force (leak-sealing component 2) to these dead-end areas.

[0025] Secondly, due to the axial bending of the arc-shaped portion 12 relative to the leaking pipe 3, it can better adapt to the non-straight sections of the leaking pipe 3. When the fixing body 11 is installed on the leaking pipe 3, the arc-shaped portion 12 and the pipe wall of the leaking pipe 3 can together form a receiving cavity, in which the pressure block 221 of the sealing component 2 is located. The receiving cavity can provide sufficient space to support the adjustment of the first end of the sealing component 2 to be aligned with the normal direction of the leak point 31, and the arc-shaped portion 12 can provide sufficient pressure to press the first end of the sealing component 2 tightly against the leak point 31 of the leaking pipe 3, avoiding the problem of the sealing tool being unable to exert force or easily slipping due to changes in pipe curvature, thereby ensuring that the sealing component 2 can vertically and stably press against the leak point 31.

[0026] The following is an illustrative description of the specific structure of this leak-sealing tool.

[0027] The fixing body 11 may include a clamp. For example, see reference. Figure 4 The clamp can be a split-type clamp, which includes at least two arc-shaped clamps and adjusting bolts connecting adjacent arc-shaped clamps. The ends of the arc-shaped clamps are connected to form a ring structure around the leaking pipe 3. By tightening the adjusting bolts, the distance between adjacent arc-shaped clamps is shortened, thereby generating radial clamping force to fix the fixing body 11 to the leaking pipe 3. Each arc-shaped clamp adopts a non-semi-circular arc design, with an arc degree selectable between 110-130 degrees, preferably 120 degrees. By matching with the adjusting bolts, it can be adapted to multi-size pipes of φ50-φ200mm, especially for curved surfaces of non-straight pipe sections, with a fitting error ≤2mm, solving the sealing failure problem caused by the mismatch of arc degree of conventional tools.

[0028] For example, the clamp can also be a steel strip clamp (not shown), which includes a flexible steel strip and a fastening mechanism at one end of the flexible steel strip. The flexible steel strip is configured to surround the leaking pipe 3, with its free side passing through the fastening mechanism to form a ring structure; the fastening mechanism includes an adjusting bolt, which, by rotating the adjusting bolt, causes the flexible steel strip to contract, thereby adapting to and locking the leaking pipe 3 of different diameters.

[0029] The fixing body 11 can be made of Q235 carbon steel, which is suitable for normal pressure (≤10MPa) environments. However, for highly corrosive oil and gas environments (such as media containing hydrogen sulfide), the fixing body 11 can be made of corrosion-resistant alloy materials, such as 316L stainless steel or Hastelloy, to improve corrosion resistance and extend tool life.

[0030] See Figure 4 The arc-shaped portion 12 is connected to one side of the clamp along its axial direction, and the inner arc surface of the arc-shaped portion 12 constitutes the pressure surface of the leak-sealing component 2. One or more arc-shaped portions 12 can be provided on the clamp; this is not limited here. Viewed axially from the clamp, the arc-shaped portion 12 has a fixed side and a free side. The fixed side is used to connect to the clamp, and the free side is configured to extend outward from the fixed side along the outside of the clamp, i.e., the free side is located circumferentially relative to the outside of the fixed body 11. This configuration allows for better adaptation to non-straight pipe sections of the leaking pipe 3; as shown in the attached figure, leak points 31 appearing on outwardly expanding non-straight pipe sections can also be sealed. From the arc length direction of the arc-shaped portion 12, the arc-shaped portion 12 can be a minor arc structure, and its curvature can be adapted to the curvature of the pipe wall of the leaking pipe 3.

[0031] The arc-shaped portion 12 is also provided with a groove 121 (i.e., a through-hole) for the sealing component 2 to pass through, allowing the sealing component 2 to move along the groove 121 to adjust its position relative to the leak point 31. The groove 121 allows the sealing component 2 to move within a certain range in the axial direction of the leaking pipe 3, so that the fixing body 11 can be installed on a non-damaged pipe section at a certain distance from the leak point 31. The sealing component 2 is precisely delivered to the leak point 31 through the groove 121, which is particularly suitable for complex working conditions where the leak point 31 is located at a bend or bulge (non-straight pipe section).

[0032] The groove 121 can penetrate the wall thickness of the arc-shaped portion 12 and be formed on the arc-shaped portion 12; the groove 121 can also be formed by dividing the arc-shaped portion 12 into two small arc-shaped parts arranged at intervals, using the interval between the two small arc-shaped parts as the groove 121. The groove 121 is configured to extend in a direction parallel to the axial direction of the leakage pipe 3. Generally, the groove 121 is formed in the middle of the arc-shaped portion 12.

[0033] See below Figure 5 and Figure 6 The leak-sealing assembly 2 may include a leak-sealing rod 21 and a mounting base 22. The mounting base 22 has a mounting channel 223 with threads, into which the leak-sealing rod 21 is inserted and screwed. After insertion, both ends of the leak-sealing rod 21 are located outside the mounting channel 223.

[0034] The main body of the mounting base 22 is located inside the arc-shaped portion 12, forming a pressure block 221. (See reference...) Figure 5The pressure block 221 has a first surface facing the arcuate portion 12 and a second surface opposite to the first surface. The first surface is arcuate, and its curvature matches the curvature of the arcuate portion 12, allowing the first surface to fit against the inner surface of the arcuate portion 12. This ensures smooth guidance during sliding and, during the sealing pressure application process, guides the transmission of pressure applied by the arcuate portion 12, keeping its direction highly consistent with the axial direction of the plugging rod 21. This minimizes lateral force components and prevents the plugging assembly 2 from tilting or jamming due to uneven force. The second surface is configured to be arcuate facing the leaking pipe 3 to better adapt to the spatial environment accommodating the cavity.

[0035] The width of the holding block 221 is smaller than the width of the arc-shaped portion 12, supporting the movement of the holding block 221 in the receiving cavity and the movement of the slider 222 in the slide groove 121, so as to facilitate the position adjustment of the plugging rod 21 and ensure that the axis of the plugging rod 21 is as perpendicular as possible to the arc tangent at the leakage point 31.

[0036] A slider 222 is provided on the surface of the pressure block 221 facing the arcuate portion 12. Generally, the slider 222 is connected to the middle of the pressure block 221. The slider 222 is configured to extend into the groove 121, and the cooperation between the slider 222 and the groove 121 restricts the mounting base 22 from circumferential rotation or tilting, allowing it to only translate axially along the leaking pipe 3. The size of the slider 222 can be adapted to the width of the groove 121, that is, after the leak-sealing assembly 2 is assembled, the groove walls on both sides of the groove 121 in the width direction contact the corresponding two side surfaces of the slider 222.

[0037] It is understandable that the design of the slider 222 and the groove 121 is not the only option. In other embodiments, the slider 222 and the arc-shaped part 12 can be connected through a universal ball joint structure. By controlling the slider 222, the plugging rod 21 can be adjusted at more angles to adapt to more complex pipe surfaces (such as tees and elbows).

[0038] See below Figure 6 and Figure 7The plugging rod 21 has a plugging surface 211 at one end for sealing the leak point 31 of the leaking pipe 3. The plugging assembly 2 may also include a sealing ring, which can be embedded in the plugging surface 211 to enhance the sealing effect on the leak point 31. Correspondingly, a sealing ring mounting groove 212 is also provided on the plugging surface 211, which surrounds the circumference of the plugging surface 211. The sealing ring mounting groove 212 can be used to install and fix the sealing ring, and can also limit the displacement of the sealing ring. The other end of the plugging rod 21 is used to connect external tools to adjust the fit between the plugging surface 211 and the leak point 31. For example, the other end of the plugging rod 21 has a mounting hole 213 for inserting tools such as an Allen wrench into the mounting hole 213 to manually rotate and pressurize, with a maximum pressure of 50kN. For another example, a micro hydraulic pump can be connected to apply constant pressure, and a pressure sensor can also be added to monitor the pressure change at the leak point 31 in real time.

[0039] Understandably, in the illustrated embodiment, one end of the plugging rod 21 is configured to extend beyond the arcuate portion 12 to facilitate position adjustment of the plugging rod 21. However, this is not the only design; in other embodiments, the same effect can be achieved by configuring one end of the slider 222 to extend beyond the arcuate portion 12.

[0040] The following details how to use this leak-sealing tool.

[0041] When the leak point 31 is a non-straight pipe section leak point 31, firstly, install the sealing ring in the sealing ring mounting groove 212, and rotate the plugging pipe to screw it into the mounting channel 223 of the mounting base 22; then, install the mounting base 22 on the arc-shaped part 12 of the fixing component 1, wherein the limiting part is located inside the arc-shaped part 12, and the slider 222 is located in the slide groove 121. At this time, the corresponding two side surfaces of the slider 222 are respectively in contact with the groove wall of the slide groove 121 to limit the axial position of the slider 222; then, move the clamp to a position directly below the leak point 31. At the section or arc segment, adjust the position so that the sealing ring completely covers the leak point 31, and keep the plugging rod 21 as perpendicular as possible to the arc sectional surface of the non-straight pipe section; then, tighten the adjusting bolt of the clamp to fix it on the leaking pipe 3. At this time, the arc-shaped part 12 of the fixing component 1 will press the limiting part against the closure of the leaking pipe 3; finally, rotate the plugging rod 21 again so that the plugging surface 211 of the plugging rod 21 fits tightly against the leak point 31, ensuring that the plugging surface 211 seals and pressurizes the leak point, thereby realizing the online plugging of the leak point 31 in the non-straight pipe section.

[0042] Secondly, this leak-sealing tool can also be applied to scenarios where the leak point 31 is a straight pipe section. When the leak point 31 is a straight pipe section, firstly, install the sealing ring in the sealing ring mounting groove 212, and rotate the leak-sealing pipe to screw it into the mounting channel 223 of the mounting base 22; then, install the mounting base 22 on the arc-shaped part 12 of the fixing component 1, wherein the limiting part is located inside the arc-shaped part 12, and the slider 222 is located in the groove 121. At this time, the corresponding two side surfaces of the slider 222 are respectively in contact with the groove wall of the groove 121 to limit the axial position of the slider 222; then, move the clamp to the leak point 3. At the straight section below 1, adjust the position so that the sealing ring completely covers the leak point 31, and keep the plugging rod 21 perpendicular to the pipe wall of the leaking pipe 3; then, tighten the adjusting bolt of the clamp to fix it on the leaking pipe 3. At this time, the arc-shaped part 12 of the fixing component 1 presses the limiting part against the closed leaking pipe 3; finally, rotate the plugging rod 21 again so that the plugging surface 211 of the plugging rod 21 fits tightly with the leak point 31, ensuring that the plugging surface 211 seals and pressurizes the leak point, thereby realizing the online plugging of the leak point 31 in the straight pipe section.

[0043] In summary, the unique advantage of this leak-sealing tool lies in its adaptability to non-straight pipe sections. For areas where clamps cannot be directly installed, such as elbows, reducers, or flange roots, this tool utilizes a cantilevered arc-shaped section 12 to overcome obstacles, extending the application point (leak-sealing component 2) to these dead-end areas. Specifically, thanks to the curved surface cooperation between the pressure block 221 and the arc-shaped section 12, the leak-sealing rod 21 can always remain perpendicular to the pipe's cross-section. This avoids the problems of uneven force or slippage caused by angular deviations at bends, which are common with conventional tools, significantly improving the sealing success rate.

[0044] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A leak-sealing tool for pipelines, characterized in that, Includes a fixing component (1) and a leak-sealing component (2); The fixing assembly (1) includes a fixing body (11) for fixing to the leaking pipe (3) and an arcuate portion (12) connected to one side of the fixing body (11); the arcuate portion (12) is configured to be curved and arched relative to the axial direction of the leaking pipe (3); Part of the structure of the plugging component (2) passes through the arc-shaped part (12); the plugging component (2) has a first end and a second end opposite to each other. The first end is located inside the arc-shaped part (12) and is used to seal the leakage point (31) of the leaking pipe (3). The second end is located outside the arc-shaped part (12) and provides a basis for adjusting the position of the first end. The leak-sealing assembly (2) also has a pressing block (221) disposed inside the arc-shaped portion (12); one side surface of the pressing block (221) is used to fit against the inner surface of the arc-shaped portion (12); the arc-shaped portion (12) is configured to press the pressing block (221) onto the leaking pipe (3) to fix the leak-sealing assembly (2).

2. The leak-sealing tool for pipelines according to claim 1, characterized in that, The arc-shaped portion (12) has a fixed side and a free side. The fixed side is fixedly connected to the fixed body (11), and the free side is located in the circumferential direction outside the fixed body (11).

3. The leak-sealing tool for pipelines according to claim 1, characterized in that, The arc-shaped part (12) is provided with a through-hole; the pressing block (221) is an arc-shaped structure, with its two ends located on both sides of the through-hole along the length direction of the arc-shaped part (12).

4. The leak-sealing tool for pipelines according to claim 3, characterized in that, The width of the pressing block (221) is smaller than the width of the arc-shaped portion (12).

5. The leak-sealing tool for pipelines according to claim 4, characterized in that, The pressing block (221) has a slider (222) on the side surface facing the arc-shaped part (12); The arc-shaped portion (12) is provided with a groove (121) for serving as the through-hole, and its extension direction is configured to be parallel to the axial direction of the leakage pipe (3); the slider (222) is disposed in the groove (121) and can move in the groove (121) to support the pressure block (221) to move within a defined range.

6. The leak-sealing tool for pipelines according to claim 5, characterized in that, The groove (121) extends through the wall thickness of the arcuate portion (12) to be formed on the arcuate portion (12); Alternatively, the arcuate portion (12) may include two small arcuate elements arranged at intervals, the interval between the two small arcuate elements forming the groove (121).

7. The leak-sealing tool for pipelines according to claim 1, characterized in that, The fixing body (11) includes a clamp, which includes at least two arc-shaped clamps and an adjusting bolt connecting adjacent arc-shaped clamps; the ends of the at least two arc-shaped clamps are connected to form a ring structure for surrounding the leaking pipe (3), and the distance between adjacent arc-shaped clamps is shortened by the adjusting bolt.

8. The leak-sealing tool for pipelines according to claim 1, characterized in that, The leak-sealing assembly (2) includes a mounting base (22) and a leak-sealing rod (21) for sealing the leak point (31). The main body of the mounting base (22) is located inside the arc-shaped part (12) to form the pressure block (221); the mounting base (22) also has an installation channel (223), and the plugging rod (21) is inserted into and screwed into the installation channel (223).

9. The leak-sealing tool for pipelines according to claim 8, characterized in that, One end of the plugging rod (21) is located on the side of the pressure block (221) facing away from the arc-shaped part (12), and is provided with a plugging surface (211); a sealing ring is provided on the outer circumferential side of the plugging surface (211).

10. The leak-sealing tool for pipelines according to claim 9, characterized in that, The plugging rod (21) also has another end located on the opposite side of the plugging surface (211), the other end of the plugging rod (21) is located on the outside of the arc-shaped portion (12) and is configured to be connected to an external tool.

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