Online plugging method and plugging device for oil leakage point of oil pipeline of hydropower station

Abstract

The invention discloses an online plugging method and device for an oil leakage point of an oil pipeline of a hydropower station. The plugging method comprises the steps that the oil leakage point is marked, and an oil leakage area of the oil pipeline is polished; the plugging plate is cut, a hole is formed in the middle of the plugging plate, and a pipe joint is welded to the hole position; fixing the plugging plate on the oil pipeline to enable the pipe joint to correspond to the oil leakage point; the plugging glue is filled on the plugging plate and the periphery of the plugging plate; and the cap is plugged on the pipe joint and leakage detection is carried out. According to the online plugging method, oil leakage of the oil conveying pipeline can be plugged online under the condition that the oil conveying pipeline is not stopped, the equipment reliability is improved, and safe and long-period operation of a power station is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pipelines in hydropower stations, and particularly to an on-line plugging method and plugging device for oil leakage points of oil pipelines in hydropower stations. Background Art

[0002] Under the action of factors such as corrosion, external force and material defects, oil pipelines in hydropower stations will have potential oil leakage hazards during operation, reducing the safe transportation performance of the oil pipelines, increasing operation risks and causing environmental pollution. Due to the strong permeability of oil and the great difficulty of plugging under pressure, for oil pipeline leakage, existing plugging techniques such as welding leak stoppage, sleeve device leak stoppage, and carbon fiber composite material sleeve repair need to be carried out when the equipment is out of service, reducing the equipment reliability and causing huge economic losses. When using the plugging glue method, since the plugging glue needs a certain time to cure and reaches complete cure in 24 hours, and the oil cannot be contacted during the plugging process, it can only be used for plugging of minor leaks and cannot perform on-line leak stoppage for defects with large oil leakage. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0004] To this end, an embodiment of the present invention provides an on-line plugging method and plugging device for oil leakage points of oil pipelines in hydropower stations.

[0005] In a first aspect, the present invention provides an on-line plugging method for oil leakage points of oil pipelines in hydropower stations, including the following steps:

[0006] (1) Mark the oil leakage point and polish the oil leakage area of the oil pipeline;

[0007] (2) Cut the plugging plate and open a hole at the middle position of the plugging plate, and weld a pipe joint at the opening position;

[0008] (3) Fix the plugging plate on the oil pipeline so that the pipe joint corresponds to the oil leakage point;

[0009] (4) Fill the plugging glue on and around the plugging plate;

[0010] (5) Seal the pipe joint with a cap and check for leaks.

[0011] Further, before step (4), it further includes cleaning the plugging plate and its surrounding positions.

[0012] Further, after step (5), it further includes painting the plugging plate and its surrounding positions.

[0013] Further, the material of the plugging plate is the same as that of the oil pipeline, and the plugging plate is arc-shaped so that the plugging plate fits the oil pipeline.

[0014] Further, a sealing ring is arranged between the plugging plate and the oil pipeline, and the sealing ring is made of oil-resistant rubber.

[0015] Further, the plugging plate is fixed on the oil pipeline by a hoop.

[0016] Further, an O-ring is arranged on the pipe joint.

[0017] Further, in step (5), the leak detection is to observe whether there is liquid leakage at the plugging part within 72 hours.

[0018] In a second aspect, the present invention provides a plugging device obtained by using the method provided in the first aspect, including:

[0019] An arc-shaped plugging plate, which is fixed on the oil pipeline by a hoop, and an opening is arranged at the middle position of the plugging plate;

[0020] A pipe joint, which is welded at the opening position;

[0021] A filling rubber layer, which is arranged on the plugging plate and around it.

[0022] Further, sealing rings are arranged between the plugging plate and the oil pipeline and on the pipe joint.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The present invention proposes an on-line plugging method for the leakage problem of the oil pipeline of the hydropower station, overcomes the deficiencies of the common plugging methods, and provides a solid foundation for the long-term operation of the hydropower oil pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, where:

[0026] Figure 1 is a schematic diagram of the oil leakage point marking method of the present invention;

[0027] Figure 2 is a schematic plan view of the arc-shaped plugging plate of the present invention;

[0028] Figure 3 is a schematic diagram of the setting position of the opening of the present invention;

[0029] Figure 4 is a schematic diagram of the pipe joint and its setting position of the present invention;

[0030] Figure 5 Schematic diagram of the setting method of the sealing ring of the present invention on the plugging plate;

[0031] Figure 6 Schematic diagram of the fixing method of the plugging plate of the present invention;

[0032] Figure 7 Schematic diagram of the filling method of the plugging adhesive of the present invention;

[0033] Figure 8 Schematic diagram of the plugging of the cap of the present invention;

[0034] Figure 9 Schematic diagram of the overall painting of the present invention;

[0035] Figure 10 Schematic diagram of the structure of the plugging device of the present invention;

[0036] Explanation of reference numerals:

[0037] 1, oil pipeline; 2, plugging plate; 3, pipe joint; 4, cap; 5, O-ring seal; 6, joint weld; 7, filling adhesive layer; 8, hoop; 9, oil leakage point; 10, rectangular sealing ring; 11, opening; 12, filling area. Detailed implementation manners

[0038] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0039] The following describes the on-line plugging method and plugging device for the oil leakage point of the oil pipeline of a hydropower station proposed by the present invention in conjunction with the drawings.

[0040] As Figure 1 shown, the on-line plugging method for the oil leakage point of the oil pipeline of a hydropower station of the present invention includes the following steps:

[0041] (1) Mark the oil leakage point and polish the oil leakage area of the oil pipeline;

[0042] (2) Cut the plugging plate and make an opening in the middle position of the plugging plate, and weld a pipe joint at the opening position;

[0043] (3) Fix the plugging plate on the oil pipeline so that the pipe joint corresponds to the oil leakage point;

[0044] (4) Fill the plugging agent on the plugging plate and its surrounding positions;

[0045] (5) Seal the cap on the pipe joint and check for leaks.

[0046] Step (1) specifically includes first grinding the paint film of the oil pipeline leaking part clean, accurately finding the oil leaking point, and marking the oil leaking point with a marker pen. The marking method of marking the oil leaking point with a marker pen is as follows: Figure 1 shown.

[0047] Step (2) specifically includes first cutting out a plugging plate of suitable size, wherein the plugging plate is arc-shaped. The arc-shaped plugging plate can better fit the oil pipeline and increase the sealing performance. In addition, the material of the plugging plate is consistent with that of the oil pipeline to facilitate the subsequent bonding between the plugging plate and the oil pipeline.

[0048] Cut out the plugging plate and clean the rust on its surface by grinding it clean. Then, open a hole in the middle of the plugging plate, which is used as a temporary oil drain hole, and weld a pipe joint at the hole. It is understandable that the hole 11 is set in the middle of the plugging plate so that the hole 11 is located in the center of the plugging plate, which is convenient for the subsequent filling of the plugging glue and is conducive to enhancing the sealing effect. Figure 2 As shown, the opening 11 and its setting position are as shown in Figure 3 As shown, the pipe joints and their locations are as follows Figure 4 shown.

[0049] In some embodiments, in order to enhance the sealing effect between the cap and the pipe joint, an O-ring is provided on the pipe joint.

[0050] In some embodiments, a circular hole is drilled in the middle of the arc-shaped sealing plate with a φ10mm high-speed steel drill bit, which is polished smooth for use as a temporary oil drainage hole during the sealing process. The pipe fitting is welded to the arc opening on the outside of the sealing plate to ensure that the entire circumference is fully welded. Before welding, the O-ring is removed and stored to prevent damage from high temperature.

[0051] In some embodiments, a sealing ring is provided between the plugging plate and the oil pipeline, and the sealing ring is made of oil-resistant rubber. Figure 5 As shown, it can be understood that the size of the sealing ring is adjusted accordingly according to the size of the blocking plate.

[0052] In some embodiments, the sealing ring is a rectangular sealing ring 10 with a thickness of 3 mm.

[0053] Step (3) is the fixing process of the plugging plate. Specifically, the plugging plate is fixed on the oil pipeline by using a hoop. The position of the pipe joint corresponds to the oil leakage point, that is, the pipe joint is aligned with the oil leakage point and then the plugging plate is fixed. After the fixing is completed, check whether the sealing ring is closely attached to the oil pipeline. If the sealing ring is closely attached to the oil pipeline, the fixing process of the plugging plate is completed; if the sealing ring is not closely attached to the oil pipeline, adjust the position of the hoop until the fixing process of the plugging plate is completed. The fixing method of the plugging plate is as Figure 6 shown, where the number of hoops is at least two, and the material of the hoop can be metal or other suitable materials.

[0054] Step (4) is the filling process of the plugging glue. Before filling the plugging glue, clean the plugging plate and the areas around it that need to be filled with the plugging glue, remove floating rust, dust, oil stains and other floating substances, and then fill the plugging glue on the plugging plate and its surrounding positions to ensure that the plugging glue completely plugs the entire plugging plate, and use the plugging glue to bond the plugging plate to the oil pipeline. The filling area 12 of the plugging glue is as Figure 7 shown. It can be understood that the position of the pipe joint is avoided during the filling process of the plugging glue.

[0055] In some embodiments, clean the plugging part with alcohol, dry the surface with a clean white cloth, and keep the surface dry and clean to facilitate the adhesion of the leak plugging glue.

[0056] In some embodiments, a pressure - resistant leak plugging rod (Kaisixin pressure - resistant leak plugging rod, Beijing TianShan New Materials Technology Co., Ltd.) is used as the plugging glue. When using it, take out the colloid, cut off the required amount, knead the two different - colored materials of the inner core and the outer skin of the colloid into one color (about 1 - 2 minutes) until uniform, and firmly press it onto the plugging plate and its surrounding positions. After 3 - 5 minutes, the colloid begins to slightly heat up and cure, and after 10 - 20 minutes, it becomes very hard.

[0057] In step (5), it is the plugging process of the cap. As Figure 8 shown, install the cap 4 onto the pipe joint for plugging. Install the cap onto the pipe joint and check for oil leakage. When there is no oil leakage in the plugged part within 72 hours, it is considered that the plugging is intact. If there is an oil leakage situation within 72 hours, check the oil leakage position and refill the plugging glue.

[0058] After confirming that the plugging is intact and there is no oil leakage, polish the surface of the plugging glue smoothly and clean its surface, and then spray paint for anti - corrosion at the plugged parts on the plugging plate and its surrounding positions. As Figure 9 shown, after the overall spray painting is completed, the plugged part and the oil pipeline are of the same color.

[0059] The plugging method for the oil leakage point of the oil pipeline of the present invention can plug the oil leakage online without stopping the operation of the oil pipeline when the pressure of the hydropower station is ≤ 1 MPa, improving the equipment reliability and ensuring the safe and long-term operation of the power station.

[0060] The plugging device of the present invention is obtained by using the method of the present invention. As Figure 10 shown, it includes a plugging plate 2, a pipe joint 3 and a filling rubber layer 7. Among them, the plugging plate 2 is arc-shaped, the outer diameter of the arc-shaped plugging plate is close to the oil pipeline 1, and the material of the plugging plate 2 is the same as that of the oil pipeline 1. The plugging plate 2 is fixed on the oil pipeline 1 through a hoop 8. An opening is provided at the middle position of the plugging plate 2, and the opening corresponds to the position of the oil leakage point 9. The pipe joint 3 is welded at the opening position to form a joint weld 6, and the pipe joint 3 is sealed by a cap 4. The filling rubber layer 7 is arranged on the plugging plate 2 and its surrounding positions, and the filling rubber layer 7 seals the gap between the plugging plate and the oil pipeline 1.

[0061] In some embodiments, a rectangular sealing ring 10 is arranged between the plugging plate 2 and the oil pipeline 1 to increase the sealing performance between the plugging plate 2 and the oil pipeline 1.

[0062] In some embodiments, an O-ring 5 is arranged on the pipe joint 3 to increase the sealing performance between the pipe joint 3 and the cap 4.

[0063] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms may be directed to different embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0065] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for online plugging of oil leakage points in an oil pipeline of a hydropower station, characterized in that: The following steps are involved: (1) Mark the oil leak point and polish the oil leak area of ​​the oil pipeline; (2) cutting the plugging plate and opening a hole in the middle of the plugging plate, and welding a pipe joint at the hole position; (3) fixing the blocking plate on the oil pipeline so that the pipe joint corresponds to the oil leakage point; (4) Fill the sealing glue on the sealing plate and its surrounding areas; (5) Seal the cap on the pipe joint and check for leaks.

2. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: Before step (4), the sealing plate and its surrounding areas are cleaned.

3. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: After step (5), the method further includes spraying paint on the sealing plate and the surrounding areas thereof.

4. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: The material of the blocking plate is consistent with that of the oil pipeline, and the blocking plate is arc-shaped so that the blocking plate fits the oil pipeline.

5. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: A sealing ring is arranged between the blocking plate and the oil pipeline, and the sealing ring is made of oil-resistant rubber material.

6. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: The blocking plate is fixed on the oil pipeline by using a clamp.

7. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: An O-type sealing ring is arranged on the pipe joint.

8. The method for online plugging of oil leakage points in the oil pipeline of a hydropower station as claimed in claim 1, characterized in that: The leak detection in step (5) is to observe whether the plugged part leaks within 72 hours.

9. A blocking device, characterized in that: Obtained by the method described in any one of claims 1 to 8, comprising: An arc-shaped plugging plate, the plugging plate is fixed to the oil pipeline by a clamp, and an opening is provided in the middle of the plugging plate; A pipe joint, the pipe joint being welded at the opening position; A filling rubber layer is arranged on the sealing plate and around it.

10. The blocking device according to claim 9, characterized in that: Sealing rings are arranged between the blocking plate and the oil pipeline and on the pipe joint.

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