Lining pipe for pipeline leakage repair in anti-explosion environment and manufacturing method thereof

Abstract

The invention discloses a lining pipe for pipeline leakage repair in an anti-explosion environment and a manufacturing method of the lining pipe. The lining pipe comprises a fluorinated silicone rubber inner pipe (4) and a lining pipe body (5), the aramid fiber woven mesh (2) is nested and adhered to the outer side of the fluorinated silicone rubber inner pipe (4); the fluororubber layer (3) is arranged on the outer side of the aramid fiber woven mesh (2) in a fusion manner; and the task of sticking, sealing and repairing leakage points in the pipeline from the outside of the device can be successfully completed without disassembling the production device and using conventional electro-gas welding equipment in an anti-explosion environment.

Description

Technical Field

[0001] The present disclosure relates to supporting materials and operation methods for the operation and maintenance of production devices in oil and gas explosion-proof areas in the oil and petrochemical industries. Background Art

[0002] The statements in this section only provide background information related to the present disclosure and do not constitute prior art.

[0003] In the oil and petrochemical industries, there are a large number of oil and gas explosion-proof areas where production devices with explosion-proof requirements are installed. Once a leak occurs in the internal pipeline of the production device during operation, involving safety risks, it is impossible to repair the leak through conventional electric welding equipment. If the leaking pipeline is in an area inside the device that cannot be disassembled, relevant repairs cannot be completed on-site.

[0004] For example, the oil and gas metering separator commonly used in metering rooms during oilfield production has an integrated separator with an independent circulating heating pipeline inside, which provides heating for the produced fluid in the separator to avoid the condensation of crude oil in the produced fluid. However, after a long service life, this part of the pipeline often leaks due to corrosion, causing the hot water in the heating pipe to enter the separator, resulting in inaccurate metering of the separator and making it unusable. The internal structure of the separator is complex and compact, making it difficult to thoroughly clean the residual oil inside, and operators cannot enter to repair it. There are also huge safety risks in disassembling the separator on-site.

[0005] The common practice in the industry for this problem is to stop production, disassemble the connecting pipelines of the separator and the roof of the metering room, lift the separator out of the metering room and return it to the factory for open-air cleaning, and then cut the outer wall of the separator to repair the leakage point of the internal heating pipe. The entire operation process is complicated and costly, seriously affecting oilfield production. There are also some pipelines in a hidden state, such as buried pipelines that cannot be dug up across the road and single pipelines inside a group of pipelines in a bridge that cannot be separated from the inside. There are problems with leakage repair that cannot be carried out from the outside. Similar situations also widely exist in the production of various oil and petrochemical industries, becoming a chronic problem in the industry.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] In view of this, the present disclosure provides a lining pipe for repairing pipeline leakage in an explosion-proof environment, successfully realizing the task of pasting and sealing leakage points inside the pipeline from outside the device without disassembling the production device and without using conventional electric welding equipment in an explosion-proof environment.

[0008] In addition, the present disclosure also provides a manufacturing method of the lining pipe for repairing pipeline leakage in the explosion-proof environment.

[0009] In a first aspect, the inner liner for repairing pipeline leakage in an explosion-proof environment includes: A fluorosilicone rubber inner tube; An aramid braided net is nested and adhered to the outside of the fluorosilicone rubber inner tube; A fluororubber layer is disposed on the outside of the aramid braided net in a fused manner.

[0010] In the present disclosure and possible embodiments, the fluorosilicone rubber inner tube is formed by mixing and extruding fluorosilicone rubber raw rubber. By weight, the components of the fluorosilicone rubber raw rubber are configured as follows: 100 - 150 parts of fluorosilicone rubber; 40 - 80 parts of silica; 50 - 150 parts of iron oxide; 5 - 10 parts of fluorosilicone oil; 2 - 2.5 parts of pine tar; 3 - 5 parts of ferric oxide; 0.5 - 1.5 parts of tert-butyl peroxybenzoate.

[0011] In the present disclosure and possible embodiments, the aramid braided net is a twill cross net. The aramid braided net is treated by soaking in a sizing agent. By weight, the composition of the sizing agent is configured as follows: 100 parts of 15% butylpyridine glue solution; 15 - 17 parts of phenolic resin mother liquor; 10 - 12 parts of 28% ammonia water.

[0012] In the present disclosure and possible embodiments, the fluororubber layer is formed by mixing and extruding fluororubber. By weight, the components of the fluororubber are configured as follows: 160 - 200 parts of fluororubber, 10 - 20 parts of MgO, 10 - 15 parts of carbon black, 15 - 30 parts of silica, 20 - 40 parts of barium sulfate, 0.5 - 1 part of zinc stearate.

[0013] In the present disclosure and possible embodiments, the wall thickness of the inner liner is configured to be 0.2 mm - 3 mm.

[0014] In a second aspect, a manufacturing method of the inner liner for repairing pipeline leakage in an explosion-proof environment according to any one of the first aspects includes: After a first mixer finishes refining fluorosilicone rubber raw rubber, it injects the rubber into a first extruder. While the first extruder extrudes the fluorosilicone rubber inner tube, it nests and adheres the aramid braided net. Before the fluorosilicone rubber inner tube undergoes permanent deformation, it enters a second extruder; After a second mixer finishes refining fluororubber raw rubber, it injects the rubber into the second extruder. While the second extruder extrudes the fluorosilicone rubber inner tube, it fuses a fluororubber layer outside the aramid braided net to obtain the inner liner.

[0015] In the present disclosure and possible embodiments, the aramid braided net is pre-treated by impregnation before the nesting and adhesion.

[0016] In the present disclosure and possible embodiments, a composite tube in which an aramid braided mesh is nested and adhered outside a fluorosilicone rubber inner tube and a fluororubber layer is fused is cooled and vulcanized and shaped to obtain the inner liner tube.

[0017] In the present disclosure and possible embodiments, the method for vulcanization and shaping includes: Add a 6-ethylenediamine solution with a temperature above 60°C and a mass concentration of not less than 1% into a container, and place the composite tube in the container to vulcanize and shape the fluororubber layer of the composite tube; at the same time, circulate a tert-butyl peroxybenzoate solution with a mass concentration of 4%-5% through the composite tube to vulcanize and shape the fluorosilicone rubber layer of the composite tube, and complete the vulcanization and shaping after reaching the set time.

[0018] In the present disclosure and possible embodiments, the set time is not less than 30 min.

[0019] The inner liner tube of the present disclosure has the following beneficial effects: (1) The overall inner liner tube has a small thickness and flexibility. Due to the addition of the aramid braided mesh, the inner liner tube has a high tear resistance and pressure-bearing capacity per unit area. When there are pressures both inside and outside the pipeline being repaired, the inner liner tube only needs to bear the pressure difference between the two, so there is no need for a large material thickness. The thickness of the inner liner tube of the present disclosure is only 0.2 mm - 3 mm. (2) When the inner liner tube is used for repairing inside the pipeline, it is unfolded by pneumatic purging and flipping and pasting. The original outer fluororubber layer becomes the inner layer of the inner liner tube, while the inner fluorosilicone rubber layer becomes the outer layer. The fluorosilicone rubber layer has good flexibility and is easily pasted on the inner wall of the pipeline, while the inner fluororubber layer has strong oil resistance, corrosion resistance and high temperature resistance, which can avoid the influence of the pipeline circulating medium on it. A small interference fit of its size can offset the shrinkage of the material, and the material hardness increases with time, which well supports the inner fluorosilicone rubber layer without peeling. (3) The combination of fluorosilicone rubber and fluororubber has both flexibility and a combination of anti-corrosion, oil resistance, high temperature resistance and anti-aging properties, and has a long service life. (4) For the production devices in oil and gas explosion-proof sites, use the nitrogen purging means that meets the safety and environmental protection requirements on the periphery to degrease and clean the leaking pipeline, introduce an adhesive into the pipeline to seal the corroded environment of the inner wall of the pipeline, then use nitrogen to purge the relevant pipeline interior to reach surface dryness, then fix the inner liner tube on one flange position by flipping, continue to use nitrogen to drive the inner liner tube 1 to flip and move until the outlet end of the pipeline, continuously purge and pressurize the inner liner tube to keep it in an expanded state, maintain it for 2 - 4 h and then relieve the pressure, check the leakage condition, and restore the installation of the pipeline components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Through the description of the embodiments of the present disclosure with reference to the following attached drawings, the above and other objects, features and advantages of the present disclosure will become clearer. In the drawings: Figure 1 is a schematic structural diagram of a lining tube for repairing pipeline leakage in an explosion-proof environment according to an embodiment of the present disclosure; Figure 2 is a processing flow chart of a lining tube for repairing pipeline leakage in an explosion-proof environment according to an embodiment of the present disclosure. Embodiment

[0021] The following is a description of the present disclosure based on embodiments. However, it should be noted that the present disclosure is not limited to these embodiments. In the following detailed description of the present disclosure, some specific details are described in detail. However, those skilled in the art can also fully understand the present disclosure for the parts not described in detail.

[0022] At the same time, unless the context clearly requires otherwise, words such as "including" and "comprising" in the entire specification and claims should be interpreted as having an inclusive meaning rather than an exclusive or exhaustive meaning; that is, it is the meaning of "including but not limited to".

[0023] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to the drawings and by way of examples.

[0024] Figure 1 is a schematic structural diagram of a lining tube for repairing pipeline leakage in an explosion-proof environment according to an embodiment of the present disclosure; Figure 2 is a processing flow chart of a lining tube for repairing pipeline leakage in an explosion-proof environment according to an embodiment of the present disclosure. As Figure 1 and Figure 2 shown, the specific process of preparing a lining tube for repairing pipeline leakage in an explosion-proof environment according to an embodiment of the present disclosure is as follows: (1) The first mixer 5 is used for the mixing process of the fluorosilicone rubber inner tube 4. 100 - 150 parts of fluorosilicone rubber (SF-1), 40 - 80 parts of white carbon black, 50 - 150 parts of iron oxide, 5 - 10 parts of fluorosilicone oil, 2 - 2.5 parts of pine tar, and 3 - 5 parts of ferric oxide are stirred and then put into the mixer according to parts by mass. The temperature of the rubber mixing is slowly raised to 110°C. According to the conventional techniques in the art, check the effect of the rubber compounding and pay attention to avoiding coking. After the mixing is completed, inject the rubber compound into the first extruder 7.

[0025] (2) Aramid filaments of suitable specifications are introduced into the knitting machine 9. After knitting the aramid mesh 12 by the cross method, it is nested into the outer edge of the outlet of the first extruder 7. Before the knitting is completed, the aramid mesh 12 is saturatedly impregnated with the sizing agent 16, which is completed by mixing 100 parts of 15% butylpyridine solution, 15 - 17 parts of phenolic masterbatch, and 10 - 12 parts of 28% ammonia water. The sizing agent 16 is impregnated by spraying between the knitting machine 9 and the first extruder 7, or the sizing agent 16 is filled in a storage container, and then the impregnation treatment is completed in such a way that the aramid mesh 12 passes through the storage container.

[0026] (3) The fluorosilicone rubber compound from the first mixer 5 enters the first extruder 7 and is extruded from the outlet to form a formed rubber tube 11 according to the shape and specifications of the outlet die. When the rubber tube 11 leaves the outlet, it combines with the aramid mesh 12 and moves forward. Then, under the action of the coolant or cold air 13, it is quickly cooled and formed into the fluorosilicone rubber inner tube 4 and the aramid braided mesh 2 of the inner liner tube 1 of the present disclosure, and enters the second extruder 8 before permanent deformation occurs; (4) The second mixer 6 is used for refining the fluororubber layer 3. According to the parts by mass, 160 - 200 parts of fluororubber, 10 - 20 parts of acid absorbent MgO, 10 - 15 parts of carbon black (MT), 15 - 30 parts of silica, 20 - 40 parts of barium sulfate, and 0.5 - 1 part of zinc stearate are stirred and then put into the second mixer 6. The temperature of the rubber during mixing is slowly raised to 120 °C. After the rubber is refined, the fluororubber compound 14 is injected into the second extruder 8; (5) The formed rubber tube material 11 complex with the aramid mesh 12 enters the second extruder 8, where the outer aramid mesh 12 comes into contact and fuses with the fluororubber compound 14 in the second extruder 8, and is extruded through the outlet of the second extruder 8 for shaping to form the final composite tube 15.

[0027] (6) After the final composite tube 15 is quickly cooled, it enters the water bath vulcanization tank for vulcanization and shaping to obtain the inner liner tube 1 for repairing pipeline leakage in the explosion-proof environment of the present disclosure.

[0028] Among them, the vulcanization and shaping process is divided into internal and external vulcanization: the hot water stored in the water bath tank maintains a temperature above 60 °C, and 3# vulcanizing agent (6 - ethylenediamine) is added to the hot water with a concentration not less than 1%. The composite tube 15 is placed in the vulcanization tank, and the outside of the composite tube 15 is vulcanized by the vulcanizing agent in the vulcanization tank. The two sides of the composite tube 15 are connected to a circulation pump, and the inside of the composite tube 1 is vulcanized with hot water containing 4 - 5% tert - butyl peroxybenzoate (TBPB) without contacting the 3# vulcanizing agent. The entire vulcanization process is carried out for not less than 30 minutes.

[0029] The inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment is a composite flexible ultra-thin repair material with fixed size specifications and continuous length. However, it should be noted that the ultra-thin feature of the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment is determined by factors such as the pressure and temperature of the repaired pipeline. If the pressure is too high, the thickness of the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment or the strength grade of the aramid braided mesh 2 will be increased as appropriate. The finished product of the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment will form a series of product configuration plans according to the diameter, pressure strength (thickness change), applicable temperature, etc.

[0030] On-site use method of the liner pipe 1 for repairing pipeline leakage in an explosion-proof environment disclosed in the present invention: (1) After the device to be repaired is shut down, the flange connection of the valve on the outside of the leaking pipeline is removed, an external circulation treatment device is connected, and cleaning fluid is introduced to clean the inside of the pipeline; (2) Inject polyurethane adhesive into the pipe and evenly apply the adhesive to the inner wall of the pipe. Then introduce nitrogen into the pipe to purge it so that the adhesive is dry on the surface. (3) Place the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment at the flange connection position outside the leaking pipeline, pre-set the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment according to the inner diameter and length of the pipeline to be repaired, turn the end of the inner liner pipe 1 for repairing pipeline leakage under explosion-proof environment close to the edge of the pipeline and stretch and compact it, and seal the other end; (4) Nitrogen is used to pressurize the inner liner tube 1 for repairing leaks in an explosion-proof environment in the pipeline, so that the inner liner tube 1 for repairing leaks in an explosion-proof environment is continuously turned over and lifted forward until the other side of the inner liner tube 1 for repairing leaks in an explosion-proof environment is pushed out of the pipeline. At this time, the inner liner tube 1 for repairing leaks in an explosion-proof environment is continuously pressurized to maintain the inflation state, so that the inner liner tube 1 for repairing leaks in an explosion-proof environment is kept in an everted and expanded state; (5) After maintaining the expansion state for 2-4 hours, release the pressure, check the molding condition of the inner liner pipe 1 for repairing pipeline leakage in an explosion-proof environment, repair the redundant inner liner pipe 1 for repairing pipeline leakage in an explosion-proof environment on both sides of the pipeline, and press in the flange gasket to finally complete the sealing of the entire section.

[0031] The inner liner pipe 1 disclosed in the present invention can realize the safe repair of the entire section of the leakage in the pipeline without using electric welding in the oil and gas explosion-proof site, especially solves the problem that the large-area corroded pipeline cannot be repaired in the explosion-proof environment, and complies with the HSE operation principles, and has broad application prospects in the petroleum and petrochemical industries.

[0032] The above-described embodiments are only for expressing the implementation manners of the present disclosure. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications, equivalent substitutions, improvements, etc. can be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the appended claims.

Claims

1. An inner lining pipe for repairing pipeline leakage in an explosion-proof environment, characterized in that, Comprising: A fluorosilicone rubber inner tube (4); An aramid braided mesh (2) is nested and adhered to the outer side of the fluorosilicone rubber inner tube (4); A fluororubber layer (3) is disposed on the outer side of the aramid braided mesh (2) in a fused manner.

2. The inner liner for repairing pipeline leakage in an explosion-proof environment according to claim 1, characterized in that: The fluorosilicone rubber inner tube (4) is formed by mixing and extruding fluorosilicone rubber raw rubber. The components of the fluorosilicone rubber raw rubber are configured by weight as follows: 100 - 150 parts of fluorosilicone rubber; 40 - 80 parts of silica; 50 - 150 parts of iron oxide; 5 - 10 parts of fluorosilicone oil; 2 - 2.5 parts of pine tar; 3 - 5 parts of ferric oxide; 0.5 - 1.5 parts of tert-butyl peroxybenzoate.

3. The inner liner for repairing pipeline leakage in an explosion-proof environment according to claim 2, characterized in that: The aramid braided mesh (2) is a twill cross mesh. The aramid braided mesh (2) is treated by soaking in a sizing agent. The composition of the sizing agent is configured by weight as follows: 100 parts of 15% butylpyridine glue solution; 15 - 17 parts of phenolic mother liquor; 10 - 12 parts of 28% ammonia water.

4. The inner liner for repairing pipeline leakage in an explosion-proof environment according to claim 3, characterized in that: The fluororubber layer (3) is formed by mixing and extruding fluororubber. The components of the fluororubber are configured by weight as follows: 160 - 200 parts of fluororubber, 10 - 20 parts of MgO, 10 - 15 parts of carbon black, 15 - 30 parts of silica, 20 - 40 parts of barium sulfate, 0.5 - 1 part of zinc stearate.

5. The inner liner for repairing pipeline leakage in an explosion-proof environment according to any one of claims 1 - 4, characterized in that: The wall thickness of the inner liner is configured to be 0.2 mm - 3 mm.

6. The manufacturing method of the inner lining pipe for repairing pipeline leakage in an explosion-proof environment according to any one of claims 1-5, characterized in that, Comprising: After the first mixer (5) finishes refining the fluorosilicone rubber raw rubber, it injects the glue into the first extruder (7). While the first extruder (7) extrudes the fluorosilicone rubber inner tube (4), it nests and adheres the aramid braided mesh (2). Before the fluorosilicone rubber inner tube (4) undergoes permanent deformation, it enters the second extruder (8); The second mixer (6) injects the fluororubber raw rubber into the second extruder (8) after refining. While the second extruder (8) extrudes the fluorosilicone rubber inner tube (4), it fuses the fluororubber layer (3) outside the aramid braided mesh (2) to obtain the inner liner (1).

7. The manufacturing method of the inner liner according to claim 6, characterized in that: The aramid braided mesh (2) is pre-impregnated and then subjected to the above-mentioned nesting and adhesion.

8. The manufacturing method of the inner liner according to claim 6 or 7, characterized in that: The composite tube (15) with the aramid braided mesh (2) nested and adhered to the outside of the fluorosilicone rubber inner tube (4) and the fluororubber layer (3) fused is cooled and vulcanized and shaped to obtain the inner liner (1).

9. The manufacturing method of the inner liner tube according to claim 8, characterized in that, The method of vulcanization and shaping includes: Add a 6-ethylenediamine solution with a temperature above 60 °C and a mass concentration of not less than 1% into the container, and place the composite pipe (15) in the container to vulcanize and shape the fluororubber layer (3) of the composite pipe (15); meanwhile, circulate a tert-butyl perbenzoate solution with a mass concentration of 4%-5% through the composite pipe (15) to vulcanize and shape the fluorosilicone rubber layer (4) of the composite pipe (15), and complete the vulcanization and shaping after reaching the set time.

10. The manufacturing method of the inner lining pipe according to claim 9, characterized in that: The set time is not less than 30 min.

Images