Quick pipeline under-pressure plugging device

Abstract

The utility model discloses a rapid pipeline under-pressure plugging device which is applied to an oil and gas pipeline with banded fracture leakage or dotted leakage. The hollow cylindrical cover body covers a leakage part of the oil-gas pipeline, and a leakage cavity is formed between the hollow cylindrical cover body and the oil-gas pipeline; the hollow cylindrical cover body is formed by splicing two arc-shaped cover plates, the two arc-shaped cover plates are provided with connecting edges, and the connecting edges form a long-strip-shaped structure; the end face covers are fixed to the two ends of the hollow cylindrical cover body, limiting parts are arranged on the end face covers, and the long-strip-shaped structures are arranged in the limiting parts. The sealing flow channel is arranged at the joint surface of the end face shield and the hollow cylindrical shield body, and the end face shield, the hollow cylindrical shield body and the oil-gas pipeline jointly form the sealing flow channel; the oil-resistant sealant is injected from the sealing runner; the pressure relief structure is connected to one arc-shaped cover plate of the hollow cylindrical cover body and communicates with the leakage cavity. The pipeline plugging device is suitable for plugging operation of pipelines with different flatness, and plugging operation of pipelines with banded crack leakage is rapidly achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas pipeline plugging technology, specifically to a rapid pipeline pressurized plugging device. Background Technology

[0002] After oil and gas extraction, pipelines need to be laid for transportation. However, after a long period of time, the external environment and the internal corrosion of the oil and gas pipelines can become severe, causing pipeline damage. This not only affects the environment but also wastes resources. Therefore, timely repair is crucial after a pipeline leak occurs. However, most existing sealing devices are external compression sealing methods. This sealing method relies entirely on the sealing plate to adhere tightly to the pipe wall, which not only has poor stability but also affects the overall aesthetics of the pipeline. Improvements are needed.

[0003] Existing technology discloses a live sealing device for oil and gas gathering and transportation pipelines. This application utilizes an upper clamp, a lower clamp, a sealing ring, and a flexible seal to seal pipeline leaks. Then, a compression rod is used to screw the sealing element into the leak. The sealing element is designed with an anti-detachment sealing structure, enabling rapid sealing. Simultaneously, the cooperation between the compression rod and the sealing ring achieves a secondary seal, ensuring the reliability of live sealing. However, this technology uses a localized tightening method to achieve a seal, which is unsuitable for pipeline leaks with band-like fissures. Furthermore, due to pipeline manufacturing processes, the pipeline surface may be uneven; therefore, using a pre-fabricated sealing structure may result in insufficient sealing between the hollow cylindrical cover and the oil and gas pipeline. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, a rapid pipeline pressurized plugging device is provided, which is suitable for pipeline plugging operations with varying degrees of flatness and can quickly achieve the plugging of pipelines that have experienced banded crack leaks.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] Firstly, a rapid pipeline pressurized sealing device is applied to oil and gas pipelines experiencing ribbon-like or point-like leaks; including...

[0007] A hollow cylindrical cover is installed over the leaking part of the oil and gas pipeline. The middle part of the hollow cylindrical cover and the oil and gas pipeline form a sealed leaking cavity. The hollow cylindrical cover is composed of two arc-shaped cover plates spliced ​​together. The two arc-shaped cover plates have a connecting edge at the joint, and the joint surface of the two connecting edges is a sealing plane. The two joint connecting edges form a long strip structure.

[0008] End face shield, the end face shield is fixed at both ends of the hollow cylindrical cover body, and a limiting square is provided on the end face shield, the elongated structure is placed in the limiting square;

[0009] The sealing channel is located at the joint surface of the end face mask and the hollow cylindrical cover. The sealing channel is formed by the end face mask, the hollow cylindrical cover, and the oil and gas pipeline. Oil-resistant sealant is injected into the sealing channel to form a sealing structure.

[0010] The pressure relief structure is connected to one of the arc-shaped cover plates of the hollow cylindrical cover and communicates with the leakage cavity.

[0011] According to the above technical solution, the sealed flow channel includes a first partition plate, a second partition plate, an injection pipe, and an overflow pipe. A first annular groove and a second annular groove are respectively provided at the contact surface of the end cover and the hollow cylindrical cover, and near the oil and gas pipeline. The first and second annular grooves form an annular flow channel. The first partition plate and the second partition plate are respectively located at the same position as the first annular groove and the second annular groove, and divide the annular flow channel into a unidirectional flow channel. The injection pipe and the overflow pipe are respectively located at the beginning and end of the unidirectional flow channel.

[0012] According to the above technical solution, slits are provided in the first and second partitions near the oil and gas pipeline, and the resistance of the oil-resistant sealant flowing in the channel is less than the resistance of passing through the slits.

[0013] According to the above technical solution, a locking key is provided on the limiting side of the end cover, and keyways matching the locking key are provided on the two connecting edges of the elongated structure.

[0014] According to the above technical solution, the cross-section of the arc-shaped cover plate of the hollow cylindrical cover is semi-circular, and arc-shaped partitions are provided at both ends of the semi-cylindrical structure. When the semi-circular structures are spliced, the arc-shaped partitions form annular partitions; the end cover is composed of two semi-circular rings, which are connected by locking bolts.

[0015] According to the above technical solution, the connecting edge adopts magnetic connection.

[0016] According to the above technical solution, the pressure relief structure is not limited to the self-sealing pressure relief structure provided in this embodiment; the pressure relief structure includes a connecting pipe fixed on the arc-shaped cover plate, a flange fixed on the end of the connecting pipe, a mounting rod fixed on the inner end of the inner wall of the connecting pipe, a limiting ring and a sealing ring fixed on the outer end of the inner wall of the connecting pipe, an inner pressure cover slidably connected between the sealing ring and the mounting rod, and a spring located between the inner pressure cover and the sealing ring.

[0017] The externally detachable pressure relief pipe section is equipped with a push rod, which pushes the inner pressure cover when connected to the flange.

[0018] According to the above technical solution, an existing sealing structure is provided between the two sealing planes of the hollow cylindrical cover.

[0019] This utility model has the following beneficial effects:

[0020] 1. A hollow cylindrical cover consisting of two arc-shaped plates is installed outside the leaking part of the oil and gas pipeline. The hollow cylindrical cover fits against the outer wall of the oil and gas pipeline, collecting the leaked oil and gas into the leak cavity. The end caps at both ends of the hollow cylindrical cover secure this structure. During this process, a pressure relief device guides the oil and gas in the leak cavity to an external atmospheric pressure container for storage, reducing the pressure in the pressure relief cavity and preventing oil and gas from flowing out from the gap between the hollow cylindrical cover and the outer wall of the oil and gas pipeline. Simultaneously, after sealant injection, automatic sealing is achieved through spring action, increasing the safety and reliability of the system.

[0021] Subsequently, oil-resistant sealant is injected into the sealing channel. After the oil-resistant sealant has fully cured, a sealing structure is formed that adapts to the flatness of the oil and gas pipeline surface, ensuring the stability and reliability of the sealing structure between the hollow cylindrical cover and the oil and gas pipeline.

[0022] Based on the above structure

[0023] First, it can adapt to different types of leakage, especially strip crack leakage, which is difficult to handle with traditional squeeze-type sealing.

[0024] Secondly, compared with existing technologies, it reduces the number of required components, making the overall structure simpler, reducing construction difficulty, and improving ease of operation.

[0025] Third, by injecting oil-resistant sealant to form a sealing ring structure, this sealing method can not only effectively seal the leak point, but also adapt to the processing defects on the pipe surface, ensuring a good sealing effect.

[0026] Fourth, compared to external compression sealing, this device achieves effective sealing while maintaining the overall aesthetics of the pipeline and does not affect the appearance quality of the pipeline.

[0027] Fifth, rapid and effective containment measures can reduce environmental pollution and resource waste caused by oil and gas leaks.

[0028] 2. The connection edge of the arc-shaped cover is designed to be magnetic, which can achieve the initial fixation of the hollow cylindrical cover on the oil and gas pipeline; combined with the secondary compression locking of the limiting side, the stability of the cover under high pressure environment is enhanced, and the expansion caused by internal pressure is prevented.

[0029] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0031] Figure 1 This is a diagram of the device provided in an embodiment of the present invention;

[0032] Figure 2 This is an exploded view of an embodiment provided by this utility model;

[0033] Figure 3 This is a side view of an embodiment provided by this utility model;

[0034] Figure 4 It is AA in 3 types;

[0035] Figure 5 It is 3 types of BB;

[0036] Figure 6 This is a diagram of the upward viewing angle device provided in an embodiment of this utility model;

[0037] In the diagram, 1. Oil and gas pipeline; 1-1. Leakage location; 2. Hollow cylindrical cover; 2-1. Arc-shaped cover plate; 2-2. Connecting edge; 2-3. Long strip structure; 2-4. Arc-shaped baffle; 3. Leakage cavity; 4. End face cover; 5. Limiting side; 6. Sealing flow channel; 6-1. First middle baffle; 6-2. Second middle baffle; 6-3. Injection pipe; 6-4. Overflow pipe; 6-5. Slit; 6-6. First annular groove; 6-7. Second annular groove; 7. Pressure relief structure; 7-1. Connecting pipe; 7-2. Flange; 7-3. Mounting rod; 7-4. Limiting ring; 7-5. Sealing ring; 7-6. Inner pressure cover; 7-7. Spring; 8. Locking key; 9. Keyway; 10. Locking bolt; 11. External detachable pressure relief pipe section; 11-1. Top rod. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0039] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] Reference Figures 1-6 As shown, the rapid pipeline pressurized sealing device provided by this utility model is applied to an oil and gas pipeline 1 where a banded fracture leak or a point leak has occurred; it includes...

[0042] Hollow cylindrical cover 2, the hollow cylindrical cover is installed on the leakage part 1-1 of the oil and gas pipeline, and the middle part of the hollow cylindrical cover and the oil and gas pipeline form a closed leakage cavity 3; the hollow cylindrical cover is spliced ​​from two arc-shaped cover plates 2-1, and the two arc-shaped cover plates have a connecting edge 2-2 at the joint, and the joint surface of the two connecting edges is a sealing plane, and the two joint connecting edges form a strip-shaped structure 2-3;

[0043] End face cover 4, the end face cover is fixed at both ends of the hollow cylindrical cover body, and a limiting square 5 is provided on the end face cover, and the long strip structure is placed in the limiting square;

[0044] The sealing channel 6 is located at the joint surface of the end face cover and the hollow cylindrical cover. The sealing channel is formed by the end face cover, the hollow cylindrical cover and the oil and gas pipeline. Oil-resistant sealant is injected into the sealing channel to form a sealing structure.

[0045] The pressure relief structure 7 is connected to one of the arc-shaped cover plates of the hollow cylindrical cover and communicates with the leakage cavity.

[0046] In Embodiment 1, the sealed flow channel includes a first partition plate 6-1, a second partition plate 6-2, an injection pipe 6-3, and an overflow pipe 6-4. A first annular groove 6-6 (on the end face cover) and a second annular groove 6-7 (on the hollow cylindrical cover) are respectively provided at the contact surface between the end face cover and the hollow cylindrical cover, and adjacent to the oil and gas pipeline. The first and second annular grooves form an annular flow channel. The first and second partition plates are respectively located at the same positions as the first and second annular grooves, dividing the annular flow channel into a unidirectional flow channel. The injection pipe and the overflow pipe are respectively located at the beginning and end of the unidirectional flow channel. In the embodiment shown in the figure, the positions of the injection pipe and the overflow pipe can be interchanged.

[0047] In Embodiment 1, a preferred pressure relief structure is provided. The pressure relief structure is not limited to the self-sealing pressure relief structure provided in this embodiment. The pressure relief structure includes a connecting pipe 7-1 fixed to the arc-shaped cover plate, a flange 7-2 fixed to the end of the connecting pipe, a mounting rod 7-3 fixed to the inner end of the inner wall of the connecting pipe, a limiting ring 7-4 and a sealing ring 7-5 fixed to the outer end of the inner wall of the connecting pipe, an inner pressure cover 7-6 slidably connected between the sealing ring and the mounting rod, and a spring 7-7 located between the inner pressure cover and the sealing ring.

[0048] The externally detachable pressure relief pipe section 11 is equipped with a push rod 11-1. When connected to the flange, the push rod pushes the inner pressure cover.

[0049] In Example 1, in order to ensure the sealing performance of the two sealing planes of the hollow cylindrical cover, an existing sealing structure, such as a sealing strip and a matching sealing groove, is provided between the two sealing planes of the hollow cylindrical cover.

[0050] Example 2

[0051] The structure and principle of Example 2 are similar to those of Example 1, except that: in order to form a complete sealing structure between the end cover and the hollow cylindrical cover and the oil and gas pipeline, a slit 6-5 is provided near the oil and gas pipeline on the first and second partition plates, and the resistance of the oil-resistant sealant flowing in the channel is less than the resistance of passing through the slit.

[0052] In embodiments 1-2, a preferred method for fixing the end cap to the hollow cylindrical shell is provided. A locking key 8 is provided on the limiting side of the end cap, and keyways 9 matching the locking key are provided on the two connecting edges of the elongated structure. Other fixing methods can also be used, such as bolt connection; or the positions of the locking key and keyway can be changed, for example, between the outer wall of the hollow cylindrical cover and the inner wall of the end cap.

[0053] In embodiments 1-2, as shown in the figures, a preferred structural form of the hollow cylindrical cover and end cap is given. In the embodiments shown in the figures, the cross-section of the arc-shaped cover plate of the hollow cylindrical cover is semi-circular, and arc-shaped partitions 2-4 are provided at both ends of the semi-cylindrical structure. When the semi-circular structures are spliced, the arc-shaped partitions form annular partitions. The end cap is composed of two semi-circular rings, which are connected by locking bolts 10. However, in this application, the cross-section of the two arc-shaped cover plates of the hollow cylindrical cover can be such that one is an arc shape larger than a semi-circle and the other is an arc shape smaller than a semi-circle.

[0054] Example 3

[0055] The structure and principle of Example 3 are similar to those of Example 1, with the following differences: To quickly complete the initial sealing of cracks in oil and gas pipelines, facilitate the connection of the end face cover to the hollow cylindrical cover, and facilitate the connection between the pressure relief structure and the external detachable pressure relief pipe section, a magnetic connection is used along the connection edges. The magnetic connection edges at both ends of the two arc-shaped cover plates attract each other, achieving a locking of the cover.

[0056] The working process of this utility model:

[0057] First, locate the leak in the oil and gas pipeline. Then, place the two arc-shaped covers of the hollow cylindrical enclosure of this device over the leak. If the connecting edges use magnetic closure, the connecting edges of the upper and lower arc-shaped covers of the oil and gas pipeline will attract each other, providing temporary fixation. During this process, connect a detachable pressure relief pipe section to the pressure relief structure. This detachable pressure relief pipe section is then connected to an external atmospheric pressure vessel for temporary collection of the leaked material. If the connecting edges do not use magnetic closure, the hollow cylindrical enclosure is fixed using end caps, and then the detachable pressure relief pipe section is connected to the pressure relief structure; however, this method is less convenient than using magnetic closure.

[0058] The push rod of the detachable pressure relief pipe section presses against the inner pressure cover, causing the inner pressure cover to move downwards against the spring pressure, thereby connecting the pressure relief pipe and the detachable pressure relief pipe section. At this time, under the action of the pressure relief pipe, the pressure of the medium inside the enclosure is discharged through the pressure relief pipe, preventing the medium from overflowing through the contact points between the enclosure and the oil and gas pipeline due to excessive pressure (due to pipeline processing reasons, the pipeline surface may not be smooth, so the sealing degree between the sealing ring of the enclosure and the oil and gas pipeline may be insufficient).

[0059] Then, the two end caps are inserted into the keyways of the two connecting edges of the elongated structure. The position of the end caps is fixed by the cooperation of the keyways, locking keys, and limiting blocks. At the same time, the limiting blocks play a secondary compression and locking role in the two connecting edges of the elongated structure. Since the limiting blocks are rigid structures, this fixing method prevents the caps from expanding at the upper and lower magnetic edges.

[0060] After the end cap is installed, it is locked using locking bolts. Oil-resistant sealant is applied to the injection or overflow pipe. The sealant enters the flow channel through the injection pipe; under the action of the baffle, the resistance to the sealant passing through the slit below the baffle is greater than that to the other side, causing the sealant to flow to one side within the flow channel, gradually filling the entire channel, and then overflowing from the overflow pipe. When the sealant overflows from the overflow pipe, the injection is stopped. After a period of time, the sealant solidifies at both ends of the cap, forming a sealing ring structure limited by the end cap. This sealing ring structure can adapt to machining defects on the pipe surface, thus achieving a complete seal.

[0061] After complete sealing, the removable pressure relief pipe section is removed. The spring compresses the inner pressure cap and sealing ring into tight contact, thus sealing the pressure relief pipe. Under the pressure of the medium inside the enclosure, the compression between the inner pressure cap and sealing ring becomes even tighter, further increasing the sealing performance. After disassembling the removable pressure relief pipe section, a permanent cover plate structure is fixed to the upper end of the pressure relief pipe with bolts to further achieve a seal.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A rapid pipeline pressurized sealing device, applied to oil and gas pipelines experiencing banded or point leaks; characterized in that: include A hollow cylindrical cover is installed over the leaking part of the oil and gas pipeline. The middle part of the hollow cylindrical cover and the oil and gas pipeline form a sealed leaking cavity. The hollow cylindrical cover is composed of two arc-shaped cover plates spliced ​​together. The two arc-shaped cover plates have a connecting edge at the joint, and the joint surface of the two connecting edges is a sealing plane. The two joint connecting edges form a long strip structure. End face shield, the end face shield is fixed at both ends of the hollow cylindrical cover body, and a limiting square is provided on the end face shield, the elongated structure is placed in the limiting square; The sealing channel is located at the joint surface of the end face mask and the hollow cylindrical cover. The sealing channel is formed by the end face mask, the hollow cylindrical cover, and the oil and gas pipeline. Oil-resistant sealant is injected into the sealing channel to form a sealing structure. The pressure relief structure is connected to one of the arc-shaped cover plates of the hollow cylindrical cover and communicates with the leakage cavity.

2. The rapid pipeline pressurized sealing device according to claim 1, characterized in that: The sealed flow channel includes a first partition plate, a second partition plate, an injection pipe, and an overflow pipe. A first annular groove and a second annular groove are respectively provided at the contact surface of the end cover and the hollow cylindrical cover, and near the oil and gas pipeline. The first and second annular grooves form an annular flow channel. The first partition plate and the second partition plate are respectively located at the same position as the first and second annular grooves, dividing the annular flow channel into a unidirectional flow channel. The injection pipe and the overflow pipe are respectively located at the beginning and end of the unidirectional flow channel.

3. The rapid pipeline pressurized sealing device according to claim 2, characterized in that: A slit is provided in the first and second partitions near the oil and gas pipeline, and the resistance of the oil-resistant sealant flowing in the channel is less than the resistance of passing through the slit.

4. The rapid pipeline pressurized plugging device according to claim 1, characterized in that: A locking key is provided on the limiting side of the end cover, and keyways matching the locking key are provided on the two connecting edges of the elongated structure.

5. The rapid pipeline pressurized plugging device according to claim 4, characterized in that: The hollow cylindrical cover has a semi-circular cross-section for its arc-shaped cover plate. Arc-shaped partitions are provided at both ends of the semi-cylindrical structure. When the semi-circular structures are spliced ​​together, the arc-shaped partitions form annular partitions. The end cover is composed of two semi-circular rings, which are connected by locking bolts.

6. The rapid pipeline pressurized sealing device according to claim 1, characterized in that: The connection edge uses magnetic attraction.

7. The rapid pipeline pressurized sealing device according to claim 1, characterized in that: The pressure relief structure includes a connecting pipe fixed to the arc-shaped cover plate, a flange fixed to the end of the connecting pipe, a mounting rod fixed to the inner end of the inner wall of the connecting pipe, a limiting ring and a sealing ring fixed to the outer end of the inner wall of the connecting pipe, an inner pressure cover slidably connected between the sealing ring and the mounting rod, and a spring located between the inner pressure cover and the sealing ring. It also includes an externally detachable pressure relief pipe section, which is equipped with a push rod. When connected to the flange, the push rod pushes the inner pressure cover.

8. The rapid pipeline pressurized sealing device according to claim 1, characterized in that: An existing sealing structure is provided between the two sealing planes of the hollow cylindrical cover.

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