Lining structure for repairing oil and gas conveying pipeline

Abstract

The utility model discloses a lining structure for repairing an oil and gas transmission pipeline, which relates to the technical field of metal pipeline protection and repair and comprises an oil pipe body, a base layer is adhered to the inner side of the oil pipe body, an adhesive layer is arranged on the outer side of the base layer, and an anti-corrosion layer is sprayed on the inner side of the base layer. An auxiliary bonding mechanism used for reinforcing the oil pipe body and the base layer is arranged on the outer side of the base layer. According to the lining structure for repairing the oil and gas conveying pipeline, through the multi-layer structural design, the multiple functions of high strength, corrosion resistance, abrasion resistance, high bonding and the like are integrated, the metal conveying pipeline is protected in an all-around mode, the service life of the pipeline is effectively prolonged, carbon fibers should be selected as the material of the base layer, and the carbon fibers have extremely high specific strength; the overall weight is obviously reduced while the bearing capacity is ensured; due to the 0-degree / 90-degree orthogonal laying layer design, the material has high rigidity and tensile strength in the transverse direction and the longitudinal direction, multi-direction loads are resisted, and anisotropy is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal pipeline protection and repair technical field, concretely is a kind of inner lining structure for repairing oil and gas transmission pipeline. BACKGROUND

[0002] Pipeline is indispensable supporting facilities for oilfield development, and is closely connected with the whole development and construction process of oilfield.In the harsh operating environment of petroleum and petrochemical industry, corrosion has become a key factor threatening the safety of pipeline and causing pipeline failure;During use, CO2 and H2S acidic gases can easily cause corrosion of oil and gas transmission pipeline, and the corrosion mode is mainly local pitting damage, which can cause pipeline perforation and disrupt the oil and gas transmission process, causing potential problems.

[0003] In order to overcome the above-mentioned defects, the prior art (Chinese patent with publication number CN219367150U and publication date of 2023-07-18) is an oil pipe with heat preservation and corrosion prevention lining.The overall structure of the oil pipe is more stable, which greatly avoids the risk of loosening between the oil pipe and the lining, increases the safety factor of the oil pipe, and provides help for the normal production operation of oil and gas field exploitation construction.A kind of oil pipe with heat preservation and corrosion prevention lining, comprising: an oil pipe; a first heat preservation and corrosion prevention lining arranged inside the oil pipe, and a second heat preservation and corrosion prevention lining arranged inside the first heat preservation and corrosion prevention lining; wherein a plurality of anti-loosening grooves are formed on the inner wall of the oil pipe, and anti-slip lines are arranged in the anti-loosening grooves; the anti-loosening grooves and the anti-slip lines are used to enhance the tightness between the first heat preservation and corrosion prevention lining and the inner wall of the oil pipe, to prevent the first heat preservation and corrosion prevention lining from being separated from the oil pipe; a heat reflecting layer and an adhesive layer are sequentially arranged between the first heat preservation and corrosion prevention lining and the second heat preservation and corrosion prevention lining.

[0004] The above-mentioned mechanism realizes the anti-corrosion protection of the relevant interior by using the corrosion prevention lining and the adhesive layer, but in actual use, the combination of the adhesive layer and the interior of the pipeline cannot achieve the ideal strength, which leads to the fact that the entire lining protection system cannot adapt to complex corrosion environment and cannot effectively guarantee the safe and stable operation of the pipeline. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an inner lining structure for repairing oil and gas transmission pipeline to solve the problems in the above background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an inner lining structure for repairing oil and gas pipelines, comprising an oil pipe body, a base layer bonded to the inner side of the oil pipe body, an adhesive layer provided on the outer side of the base layer, and an anti-corrosion layer sprayed on the inner side of the base layer; an auxiliary bonding mechanism for reinforcing the oil pipe body and the base layer is provided on the outer side of the base layer, the auxiliary bonding mechanism including a fixing protrusion, the fixing protrusion being fixedly connected to the outer side of the adhesive layer, and a fixing groove matching the fixing protrusion being opened on the inner side of the oil pipe body; a limiting frame is bonded inside the anti-corrosion layer, and a splicing mechanism for quick replacement is provided on the inner side of the limiting frame.

[0007] Furthermore, the height of the fixing protrusion is 0.1 mm, and the length of the fixing protrusion is equal to the length of the adhesive layer.

[0008] Furthermore, the anti-corrosion layer includes an inorganic wear-resistant anti-corrosion layer and an organic wear-resistant anti-corrosion layer, and the thickness of the anti-corrosion layer is 2mm.

[0009] Furthermore, the splicing mechanism includes a splicing layer, and the splicing layer is engaged with both sides of the limiting frame, and both sides of the limiting frame are provided with limiting grooves that match the splicing layer.

[0010] Furthermore, the cross-section of the limiting frame is "I" shaped, and the length of the limiting frame is equal to the length of the splicing layer.

[0011] Furthermore, the limiting frame has mounting slots at both the front and rear ends, and mounting plates are engaged inside the mounting slots. The front end of the mounting plate is attached to both ends of the splicing layer.

[0012] Furthermore, the cross-section of the splicing layer is arc-shaped, and the splicing layer is distributed at equal angles within the anti-corrosion layer.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Through a multi-layered structural design, this system integrates high strength, corrosion resistance, wear resistance, and strong adhesion, providing comprehensive protection for metal pipelines and effectively extending their service life. The base layer should be made of carbon fiber, which possesses extremely high specific strength (strength-to-weight ratio), significantly reducing overall weight while ensuring load-bearing capacity. The transverse-longitudinal orthogonal layup design gives the material high stiffness and tensile strength in both the transverse and longitudinal directions, resisting multi-directional loads and reducing anisotropy. The epoxy resin matrix provides excellent chemical corrosion resistance, and the carbon fiber-epoxy resin composite material exhibits excellent fatigue resistance, making it suitable for long-term dynamic load environments. The low coefficient of thermal expansion of carbon fiber combined with epoxy resin ensures minimal structural deformation under temperature changes.

[0015] Furthermore, the wear-resistant and corrosion-resistant layer includes both inorganic and organic wear-resistant and corrosion-resistant layers, effectively combining organic and inorganic wear-resistant corrosion resistance to prevent harmful external ions from penetrating the interior of the metal pipe, thus providing better wear resistance and corrosion resistance.

[0016] Furthermore, the fixing protrusions on the surface of the adhesive layer and the fixing grooves opened on the inner side of the tubing body can significantly improve the bonding stability between the material and the tubing body, adapt to complex field environments, and ensure the durability of the protective and repair effect. While ensuring the protective and repair performance, it also takes into account cost control and construction convenience, and has good market promotion prospects.

[0017] 2. By bonding the limiting frame to the inside of the wear-resistant and corrosion-resistant layer, and then snapping the splicing layer into the inside of the limiting frame, the limiting grooves on both sides of the limiting frame allow the splicing layer to maintain a stable snap-fit ​​connection with the limiting frame through the limiting grooves. Then, through the snap-fit ​​connection between the mounting groove and the mounting plate, the position of the splicing layer can be fixed in a secondary limiting manner. This allows the inner lining protection mechanism to quickly disassemble and replace the pitted part when pitting occurs, increasing the overall flexibility during use.

[0018] Furthermore, the cross-section of the limiting frame is "I" shaped, which allows the splicing layer and the limiting frame to fit more tightly. The limiting frame and the two ends of the splicing layer can be fixed by bolts through the mounting plate, increasing the stability during use. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the present utility model.

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 3 This is a partial structural diagram of the splicing structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the exploded structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the limiting frame of this utility model.

[0024] Figure 6 This is a partially enlarged structural diagram of the splicing structure of this utility model.

[0025] In the diagram: 1. Tubing body; 2. Adhesive layer; 3. Base layer; 4. Wear-resistant and corrosion-resistant layer; 5. Fixing protrusion; 6. Fixing groove; 7. Splicing layer; 8. Limiting bracket; 9. Limiting groove; 10. Mounting groove; 11. Mounting plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: As Figure 1 , Figure 2 and Figure 4 The technical solution shown addresses the problem of insufficient adhesion between the oil pipe body 1 and the adhesive layer 2, which easily leads to detachment. This lining structure for repairing oil and gas pipelines discloses an auxiliary bonding mechanism, including an oil pipe body 1. A base layer 3 is bonded to the inner side of the oil pipe body 1, and an adhesive layer 2 is provided on the outer side of the base layer 3. A wear-resistant and corrosion-resistant layer 4 is sprayed onto the inner side of the base layer 3. An auxiliary bonding mechanism for reinforcing the connection between the oil pipe body 1 and the base layer 3 is provided on the outer side of the base layer 3. The auxiliary bonding mechanism includes a fixing protrusion 5, which is fixedly connected to the outer side of the adhesive layer 2. A fixing groove 6 matching the fixing protrusion 5 is provided on the inner side of the oil pipe body 1. The height of the fixing protrusion 5 is 0.1 mm, and its length is equal to the length of the adhesive layer 2. The wear-resistant and corrosion-resistant layer 4 includes an inorganic wear-resistant and corrosion-resistant layer and an organic wear-resistant and corrosion-resistant layer, and its thickness is 2 mm.

[0028] In this case, the oil pipe body 1 is adhered tightly with the adhesive layer 2 through the auxiliary adhesive mechanism inside the oil pipe body 1, and then the mutual cooperation between the base layer 3 and the wear-resistant corrosion-resistant layer 4 arranged inside the adhesive layer 2 plays a role in protecting the inside of the oil pipe body 1. By arranging the fixed protrusions 5 with a height of 0.1 mm on the outside of the adhesive layer 2, and by arranging the fixed grooves 6 matching the fixed protrusions 5 on the inside of the oil pipe body 1, the contact area of the adhesive layer 2 and the oil pipe body 1 can be increased when they are adhered through the mutual cooperation of the fixed protrusions 5 and the fixed grooves 6, so that the adhesive layer 2 and the oil pipe body 1 can be adhered more firmly when they are adhered, and the stability during use is increased. The base layer 3 is a carbon fiber reinforced epoxy resin layer with a thickness of 2-3 mm, and the carbon fiber prepreg is arranged in a transverse-longitudinal orthogonal manner, and the number of layers of the carbon fiber prepreg depends on the preset thickness of the structural reinforcement layer. The wear-resistant corrosion-resistant layer 4 should include inorganic wear-resistant corrosion-resistant layer and organic wear-resistant corrosion-resistant layer. The inorganic wear-resistant corrosion-resistant layer is a nano-aluminum oxide ceramic coating with a thickness of 2 mm, and the organic wear-resistant corrosion-resistant layer is an epoxy resin coating with a thickness of 2 mm. The adhesive layer 2 should use modified acrylic adhesive with a thickness of 1 mm. First, the transverse-longitudinal orthogonal carbon fiber prepreg is cut according to the inner diameter of the pipeline (+3% allowance), preheated at 40-50℃ for 15 minutes to improve the fluidity of the resin. The prepreg is wound on a cylindrical mold (diameter slightly smaller than the inner diameter of the pipeline), each layer overlaps 5-8 mm, and the transverse-longitudinal orthogonal direction is aligned. Vacuumize to-0.09MPa to remove bubbles. Stepwise heating to 120℃ (2h)+150℃ (1h), pressure 0.5-0.7MPa, demoulding after curing, and then spraying the inorganic wear-resistant corrosion-resistant layer and the organic wear-resistant corrosion-resistant layer on the inner wall of the adhesive layer 2 in turn to ensure the thickness of the sprayed layer. Then, the prepared inner lining structure is put into a hot press tank for overall curing, the temperature is controlled at 150-180℃, the pressure is 0.7-1.0MPa, and the time is 3-4 hours. After curing, the edges are trimmed to ensure the flatness of the overall structure. Non-destructive testing (such as ultrasonic testing) is performed to ensure that each layer is firmly combined, free of bubbles, cracks and other defects. The size, sealing performance, high temperature resistance and other properties are tested to ensure that they meet the design requirements. Finally, the prepared inner lining structure is installed, and the modified acrylic adhesive is sprayed with a thickness of about 1 mm. The inner lining structure forms a strong adhesive inner lining on the inner wall of the oil and gas pipeline after installation. The modified acrylic adhesive has strong adhesion to the surface of the oil and gas pipeline, and can form a stable and firm bond with the pipeline surface.

[0029] Example two: Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6The technical solution shown addresses the problem that the inner lining of the oil pipe body 1 may experience localized corrosion after prolonged use, making replacement difficult. This lining structure for repairing oil and gas pipelines discloses a splicing mechanism. A limiting frame 8 is bonded inside the wear-resistant and corrosion-resistant layer 4, and the sides of the limiting frame 8 are equipped with a splicing mechanism for quick replacement. The splicing mechanism includes a splicing layer 7, which is engaged with both sides of the limiting frame 8. Limiting grooves 9 matching the splicing layer 7 are provided on both sides of the limiting frame 8. The limiting frame 8 has an "I"-shaped cross-section, and its length is equal to the length of the splicing layer 7. Mounting grooves 10 are provided at both ends of the limiting frame 8, and mounting plates 11 are engaged inside each mounting groove 10. The front end of the mounting plate 11 is fitted to both ends of the splicing layer 7. The splicing layer 7 has an arc-shaped cross-section and is distributed at equal angles within the wear-resistant and corrosion-resistant layer 4.

[0030] In this example, the limiting frame 8 is bonded to the inside of the wear-resistant and corrosion-resistant layer 4, and then the splicing layer 7 is snapped into the inside of the limiting frame 8. Due to the limiting grooves 9 on both sides of the limiting frame 8, the splicing layer 7 can be stably snapped into the limiting frame 8 through the limiting grooves 9. Then, through the snapping connection between the mounting groove 10 and the mounting plate 11, the position of the splicing layer 7 can be fixed for a second time. This allows the inner lining protection mechanism to be quickly disassembled and replaced when pitting occurs, increasing the overall flexibility during use. The cross-section of the limiting frame 8 is "I" shaped, which allows the snapping between the splicing layer 7 and the limiting frame 8 to be more tightly fitted. Furthermore, the two ends of the limiting frame 8 and the splicing layer 7 can be fixed by bolts through the mounting plate 11, increasing the stability during use.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lining structure for repairing oil and gas pipelines, comprising an oil pipe body (1), wherein a base layer (3) is bonded to the inner side of the oil pipe body (1), and an adhesive layer (2) is provided on the outer side of the base layer (3), and a wear-resistant and corrosion-resistant layer (4) is sprayed on the inner side of the base layer (3). Its features are: An auxiliary bonding mechanism for reinforcing the oil pipe body (1) and the base layer (3) is provided on the outer side of the base layer (3). The auxiliary bonding mechanism includes a fixing protrusion (5), and the fixing protrusion (5) is fixedly connected to the outer side of the bonding layer (2). A fixing groove (6) matching the fixing protrusion (5) is opened on the inner side of the oil pipe body (1). The wear-resistant and corrosion-resistant layer (4) has a limiting frame (8) bonded inside, and the side of the limiting frame (8) is provided with a splicing mechanism for quick replacement.

2. The lining structure for repairing oil and gas pipelines according to claim 1, characterized in that: The height of the fixing protrusion (5) is 0.1 mm, and the length of the fixing protrusion (5) is equal to the length of the adhesive layer (2).

3. The lining structure for repairing oil and gas transmission pipelines according to claim 2, characterized in that: The wear-resistant and corrosion-resistant layer (4) includes an inorganic wear-resistant and corrosion-resistant layer and an organic wear-resistant and corrosion-resistant layer, and the thickness of the wear-resistant and corrosion-resistant layer (4) is 2 mm.

4. The lining structure for repairing oil and gas transmission pipelines according to claim 1, characterized in that: The splicing mechanism includes a splicing layer (7), and the splicing layer (7) is engaged with both sides of the limiting frame (8). Both sides of the limiting frame (8) are provided with limiting grooves (9) that match the splicing layer (7).

5. The lining structure for repairing oil and gas transmission pipelines according to claim 4, characterized in that: The cross-section of the limiting frame (8) is "I" shaped, and the length of the limiting frame (8) is equal to the length of the splicing layer (7).

6. The lining structure for repairing oil and gas transmission pipelines according to claim 5, characterized in that: The limiting frame (8) has mounting slots (10) at both the front and rear ends, and mounting plates (11) are engaged inside the mounting slots (10). The front end of the mounting plate (11) is attached to both ends of the splicing layer (7).

7. The lining structure for repairing oil and gas transmission pipelines according to claim 6, characterized in that: The cross-section of the splicing layer (7) is arc-shaped, and the splicing layer (7) is distributed at equal angles inside the wear-resistant and corrosion-resistant layer (4).

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