Large-diameter high-pressure petroleum pipeline defect plugging device and plugging method

Abstract

The application discloses a large-diameter high-pressure petroleum pipeline defect plugging device, which comprises two combined ring arms, two fixed ring arms and a stuffing box, the two combined ring arms are connected, the two fixed ring arms are connected, one end of the stuffing box is connected with one combined ring arm, the other end of the stuffing box is connected with one fixed ring arm, one combined ring arm is connected with one fixed ring arm, the combined ring arms, the fixed ring arms and the stuffing box are installed on a pipeline, and the bottom of the stuffing box is provided with a ring-shaped pointed part, the structure of the combined ring arms and the fixed ring arms is improved, the mass of the plugging device is greatly reduced, the plugging device is very convenient to carry, the light, mobile and rapid maintenance capacity is realized, and the local plugging of the oil pipeline can be realized in the shortest time when the local leakage of the oil pipeline occurs.

Description

Technical Field

[0001] This invention relates to the field of sealing device technology, specifically a defect sealing device and method for large-diameter high-pressure oil pipelines. Background Technology

[0002] Currently, with the increasing service life of domestic oil pipelines such as the Western Crude Oil Pipeline and the analysis of pipeline inspection results, corrosion perforation or weld cracks will become risk points for oil leakage in the future. In sections of the Western Crude Oil Pipeline laid along elevation changes, many sections are located in valleys and depressions, where the static pressure at the lowest points can reach up to 3 MPa. Leaks at these low points cannot be repaired by returning oil. Once crude oil leaks, firstly, it will cause environmental pollution to rivers, water bodies, and soil; secondly, it may cause personal and property losses such as fires and explosions; and thirdly, upstream oil fields and downstream refineries will be affected to varying degrees, causing a chain reaction on crude oil development and the oil supply market. Online sealing technology, enabling rapid resumption of production and ensuring uninterrupted oil supply to upstream and downstream pipelines, has become the core solution to this challenge. Currently, there are no publicly available cases of pressurized sealing of large-diameter crude oil pipelines with corrosion-resistant layers, such as those with weld cracks, such as those with Φ813mm. Existing sealing clamps are bulky, rely on cranes and other lifting equipment, and are difficult to operate. Sealing requires multiple people and is difficult to operate. For example, since the outer surface of the pipeline has a corrosion-resistant layer, the traditional method is to first peel off the corrosion-resistant layer and then install the clamp, which weighs up to 900KG. First, the soil around the pipeline to be sealed must be dug out, and then the clamp is hoisted to the sealing point using lifting equipment. For the area below the pipeline, it is necessary to manually drill to the bottom of the pipeline to tighten the clamp. The above steps result in a long sealing time and cannot achieve rapid sealing. Since digging the working area next to the pipeline and manually peeling off the corrosion-resistant layer both take time, crude oil will accumulate in the excavated pit. It is very dangerous for manual people to reach the bottom of the pipeline to install the clamp, because the crude oil may submerge the lower end of the pipeline. It is very dangerous for manual people to operate in the crude oil environment for a long time. Summary of the Invention

[0003] This invention provides a defect sealing device and method for large-diameter, high-pressure oil pipelines, enabling convenient, mobile, and rapid maintenance. It allows for localized sealing of leaks in oil pipelines in the shortest possible time. The modular design of the clamps facilitates transportation and handling.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] This invention discloses a defect sealing device for large-diameter high-pressure oil pipelines, comprising two combined ring arms, two fixed ring arms, and a stuffing box. The two combined ring arms are connected, and the two fixed ring arms are connected. One end of the stuffing box is connected to one combined ring arm, and the other end of the stuffing box is connected to one fixed ring arm. One combined ring arm and one fixed ring arm are connected. The combined ring arms, fixed ring arms, and stuffing box are installed on the pipeline, and the bottom of the stuffing box is provided with an annular tip.

[0006] Furthermore, the combined ring arm includes two parallel ring arms and a connecting bolt. The two ring arms are connected by multiple connecting bolts. One end of the two ring arms is connected to the stuffing box by the connecting bolt. The other end of the two ring arms is connected to one end of the two ring arms of another combined ring arm by the connecting bolt. One end of the ring arm of the other combined ring arm is connected to the fixed ring arm by the connecting bolt.

[0007] Furthermore, the two fixed ring arms are connected by connecting bolt two, and one of the fixed ring arms is connected to one end of the stuffing box by connecting bolt one.

[0008] Furthermore, the fixed ring arm is provided with weight reduction holes.

[0009] Furthermore, the stuffing box includes a stuffing box body, which is connected to a combined ring arm and a fixed ring arm. A telescopic sealing head is installed at the center of the stuffing box body, and a positioning pressure plate is installed on the top of the telescopic sealing head. The positioning pressure plate and the stuffing box body are connected by several connecting bolts.

[0010] Furthermore, the telescopic sealing head is provided with sealing channels, which include channel one located at the bottom of the telescopic sealing head, channel two located inside the telescopic sealing head, and channel three located at the top of the telescopic sealing head. Channel two connects channel one and channel three, and channel three communicates with the outside. The bottom two sides of channel one are pointed.

[0011] Furthermore, there is another positioning plate at the upper end of the positioning plate, and an expansion joint is provided between the two positioning plates. The connecting bolts pass through the top positioning plate.

[0012] This invention also discloses a method for sealing defects in large-diameter, high-pressure oil pipelines, comprising the following steps:

[0013] Excavate working space around the pipeline defect;

[0014] Pre-install a combined ring arm, a fixed ring arm, and a stuffing box on the pipeline, and then move the pre-installed structure as a whole to the leak point, with the stuffing box covering the leak point;

[0015] Use a hydraulic jack to push the stuffing box body, embed the tip of the stuffing box into the anti-corrosion layer, then embed it into the pipe, fix the stuffing box with bolts, and use connecting bolts to tighten the combined ring arm and the fixed ring arm.

[0016] Using a sealing filler injection tool, inject the sealing filler into the sealing channel until the injection pressure reaches the predetermined value.

[0017] When using a hydraulic jack, assuming that applying 150 kg can cut the pipe and applying 100 kg can cut the anti-corrosion layer, first apply 100 kg. When the telescopic sealing head does not move, gradually increase the pressure to 150 kg, and then immediately stop applying pressure.

[0018] The beneficial effects of this invention are:

[0019] This invention significantly reduces the weight of the sealing device by improving the structure of the combined ring arm and the fixed ring arm. It is also very easy to carry, enabling lightweight, mobile, and rapid maintenance capabilities, and allowing for local sealing of oil pipeline leaks in the shortest possible time. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the present invention.

[0022] Figure 2 This is a schematic diagram illustrating the use of the present invention.

[0023] Figure 3 This is the front view of the present invention.

[0024] Figure 4 This is a top view of the present invention.

[0025] Figure 5 This is a partial cross-sectional view of the present invention.

[0026] Figure 6 for Figure 2 Enlarged view of section B in the middle. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] As shown in the figure, this invention discloses a defect sealing device for large-diameter high-pressure oil pipelines, comprising two combined ring arms 1, two fixed ring arms 2, and a stuffing box 3. The two combined ring arms 1 are connected, the two fixed ring arms 2 are connected, one end of the stuffing box 3 is connected to one combined ring arm 1, and the other end of the stuffing box 3 is connected to one fixed ring arm 2. One combined ring arm 1 and one fixed ring arm 2 are connected. The combined ring arms 1, fixed ring arms 2, and stuffing box 3 are installed on the pipeline 4. The bottom of the stuffing box is provided with an annular tip 81. The fixed ring arms 2 and combined ring arms 1 of this invention are detachable, reducing the overall weight and facilitating carrying. The tip 81 directly cuts into the anti-corrosion layer and then into the pipeline surface by 0.1mm-0.2mm to achieve a seal.

[0029] In one embodiment of the present invention, the combined ring arm 1 includes two parallel ring arms 11 and connecting bolts 5. The two ring arms 11 are connected by multiple connecting bolts 5. One end of each ring arm 11 is connected to the stuffing box 3 by connecting bolts 5. The other end of each ring arm 11 is connected to one end of each of the two ring arms 11 of another combined ring arm by connecting bolts 6. One end of the ring arm 1 of the other combined ring arm is connected to the fixed ring arm by connecting bolts 5. The ring arms 11 and the combined ring arm 1 of the present invention are connected to the stuffing box 3 by connecting bolts 5, respectively, and can be quickly connected to the pipe 4.

[0030] In one embodiment of the present invention, two fixed ring arms 2 are connected by connecting bolt 2 6, and one of the fixed ring arms 2 is connected to one end of the stuffing box 3 by connecting bolt 1 5.

[0031] In one embodiment of the present invention, the fixing ring arm 2 is provided with a weight-reducing hole 21. The weight-reducing hole 21 reduces the weight of the product, making it easier to carry.

[0032] In one embodiment of the present invention, the stuffing box 3 includes a stuffing box body 7, which is connected to the combined ring arm 1 and the fixed ring arm 2. A telescopic sealing head 8 is installed at the center of the stuffing box body 7, and a positioning pressure plate 9 is installed on the top of the telescopic sealing head 8. The positioning pressure plate 9 and the stuffing box body 7 are connected by several connecting bolts 10. In use, the stuffing box body 7 is first assembled on the pipe 4 with bolts, but not directly at the leak point. Then, the whole assembly is moved to the leak point, with the telescopic sealing head 8 facing the leak point A. At this time, the combined ring arm 1 and the fixed ring arm 2 are not tightened. Then, a hydraulic jack is used to push the stuffing box body 7, pressing the stuffing box body 7 against the surface of the pipe 4. Then, the stuffing box body 7 is fixed with bolts. The combined ring arm 1 and the fixed ring arm 2 are tightened using connecting bolts 6.

[0033] In one embodiment of the present invention, the telescopic sealing head 8 is provided with a sealing channel 12. The sealing channel 12 includes a channel 121 located at the bottom of the telescopic sealing head, a channel 122 located inside the telescopic sealing head, and a channel 123 located at the upper end of the telescopic sealing head. Channel 122 connects channel 121 and channel 123, and channel 123 communicates with the outside. The bottom two sides of channel 1 are pointed portions 81. Using a sealing filler injection tool, sealing filler is injected into the sealing channel 12 until the injection pressure reaches a predetermined value. At this point, the leakage point is sealed.

[0034] In one embodiment of the present invention, a second positioning plate 9 is provided at the upper end of the positioning plate 9, and a telescopic adjuster 13 is provided between the two positioning plates 9. A connecting bolt 10 passes through the top positioning plate 9. A hydraulic jack is installed on the lower positioning plate 9.

[0035] This invention also discloses a method for sealing defects in large-diameter, high-pressure oil pipelines, comprising the following steps:

[0036] Excavate working space around the pipeline defect;

[0037] Pre-install a combined ring arm, a fixed ring arm, and a stuffing box on the pipeline, and then move the pre-installed structure as a whole to the leak point, with the stuffing box covering the leak point;

[0038] Use a hydraulic jack to push the stuffing box body, embed the tip of the stuffing box into the anti-corrosion layer, then embed it into the pipe, fix the stuffing box with bolts, and use connecting bolts to tighten the combined ring arm and the fixed ring arm.

[0039] Using a sealing filler injection tool, inject the sealing filler into the sealing channel until the injection pressure reaches the predetermined value.

[0040] When using a hydraulic jack, assuming that applying 150 kg can cut the pipe and applying 100 kg can cut the anti-corrosion layer, first apply 100 kg. When the telescopic sealing head does not move, gradually increase the pressure to 150 kg, and then immediately stop applying pressure.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A defect sealing device for large-diameter high-pressure oil pipelines, characterized in that, It includes two combined ring arms, two fixed ring arms, and a stuffing box. The two combined ring arms are connected, and the two fixed ring arms are connected. One end of the stuffing box is connected to one combined ring arm, and the other end of the stuffing box is connected to one fixed ring arm. One combined ring arm and one fixed ring arm are connected. The combined ring arms, fixed ring arms, and stuffing box are installed on the pipeline. The bottom of the stuffing box has an annular tip. The stuffing box includes a stuffing box body, which is connected to the combined ring arms and fixed ring arms. A telescopic sealing head is installed at the center of the stuffing box body. A positioning pressure plate is installed on the top of the telescopic sealing head. The positioning pressure plate and the stuffing box body are connected by several connecting bolts. The telescopic sealing head has a sealing channel, which includes channel one at the bottom of the telescopic sealing head, channel two inside the telescopic sealing head, and channel three at the top of the telescopic sealing head. Channel two connects channel one and channel three, and channel three communicates with the outside. The bottom two sides of channel one are pointed. There is also a positioning pressure plate at the top of the positioning pressure plate. A telescopic adjuster is provided between the two positioning pressure plates. The connecting bolts pass through the top positioning pressure plate.

2. The defect sealing device for large-diameter high-pressure oil pipelines according to claim 1, characterized in that, The combined ring arm includes two parallel ring arms and a connecting bolt. The two ring arms are connected by multiple connecting bolts. One end of the two ring arms is connected to the stuffing box by the connecting bolt. The other end of the two ring arms is connected to one end of the two ring arms of another combined ring arm by the connecting bolt. One end of the ring arm of the other combined ring arm is connected to the fixed ring arm by the connecting bolt.

3. The defect sealing device for large-diameter high-pressure oil pipelines according to claim 2, characterized in that, The two fixed ring arms are connected by connecting bolt two, and one of the fixed ring arms is connected to one end of the stuffing box by connecting bolt one.

4. The defect sealing device for large-diameter high-pressure oil pipelines according to claim 3, characterized in that, The fixed ring arm is equipped with weight reduction holes.

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