External repairing structure for oil and gas conveying pipeline

Abstract

The utility model discloses an external repair structure for an oil and gas transmission pipeline, which relates to the technical field of oil and gas transmission pipeline repair and comprises a transmission pipeline body, a bonding layer is bonded on the outer side of the transmission pipeline body, two base layers are sleeved on the outer side of the bonding layer, and a heat insulation layer is fixedly connected on the outer side of each base layer. A reinforcing mechanism for increasing the bonding strength is arranged at one end between the two base layers. According to the external repairing structure for the oil and gas conveying pipeline, the polymer cement mortar is used as the reinforcing layer, and a high-molecular polymer is introduced into the cement mortar, so that the bonding strength is greatly improved, the bonding strength is improved to 0.24 MPa from 0.16 MPa of original pure mortar, the reinforcing layer is tightly connected with the pipe wall, and the sealing performance reaches 12 MPa after a design material is reinforced; the structural strength of the mortar can resist external erosion; when the pipeline deforms due to factors such as temperature change and geological stress, the reinforcing layer is kept in a tight fit state, and the hidden danger of corrosion caused by gaps generated by deformation is effectively prevented.

Description

TECHNICAL FIELD

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

[0002] Oil and gas transmission pipeline is the core component of energy infrastructure, long-term exposure to complex operating conditions in the environment.Under the influence of soil stress, medium corrosion, third party construction damage and material aging, pipe body is prone to mechanical damage, corrosion perforation, ring weld defects and other structural hidden dangers;When structural hidden danger occurs during use, the pipeline needs to be repaired immediately, but the traditional repair method has different defects, welding repair can cause subsequent explosion risk, mechanical clamp plugging can cause sealing failure due to size deviation, and epoxy composite material repair can cause brittle fracture in low temperature environment.

[0003] In order to overcome the above defects, the prior art (Chinese patent with publication number CN215928836U and publication date of 2022-03-01) oil and gas transmission pipeline with anticorrosion coating relates to transmission pipeline field, including main pipeline, the main pipeline is symmetrically provided with mounting groove, the outer side of the main pipeline is symmetrically provided with protective plate, the outer side of the protective plate is coated with anticorrosion coating, two fixing ladder grooves are formed in the two protective plates, two locking connectors for fixing the protective plates are installed in the two mounting grooves, the two locking connectors are installed in the two fixing ladder grooves through the protective plates, two protective cover plates are installed in the two fixing ladder grooves, and arc-shaped connecting grooves are formed in one end of the two protective plates.When local damage occurs in the anticorrosion coating on the pipeline, the main pipeline does not need to be maintained, so that the maintenance work becomes simple, and spraying work does not need to be carried out in the field, so that complex spraying equipment does not need to be carried, so that the repair work is more convenient and easy.The above mechanism cooperates with the anticorrosion coating and protective cover plate to maintain the damaged coating, but in actual use, the existing repair technology mainly relies on welding reinforcement and clamp mechanical plugging to repair the pipeline, and due to the deviation of pipeline ovality and the difference of external anticorrosion layer, the clamp sealing is easy to fail, and the composite material winding repair needs long time curing, which causes poor timeliness in rush repair. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of external repair structure for oil and gas transmission pipeline, to solve the problem of low repair efficiency of pipeline and poor adaptability after repair in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: An external repair structure for oil and gas conveying pipeline, including conveying pipeline body, the outside bonding of conveying pipeline body has bonding layer, and the outside of bonding layer is equipped with two base layers, the outside fixed connection of base layer has heat insulating layer, one end between two base layers is provided with the strengthening mechanism for increasing bonding strength, the strengthening mechanism includes three reinforcing layers, and three reinforcing layers are bonded to the inner wall and the outer wall of two base layers respectively, and the reinforcing layer is connected with the reinforcing layer in bonding, the outside of heat insulating layer is provided with the protection layer, and the both ends of protection layer are provided with the compression resistance mechanism for increasing structural strength.

[0006] Further, the reinforcing layer and the reinforcing layer are misaligned and bonded, and the length of the reinforcing layer is equal to the length of the reinforcing layer.

[0007] Further, the inner side of the bonding layer is fixedly connected with the fixed lug, and the outer side of the conveying pipeline body is provided with the fixed groove matched with the fixed lug.

[0008] Further, the height of the fixed lug is 0.1mm-0.15mm, and the fixed lug is distributed at equal angles on the inner side of the bonding layer.

[0009] Further, the compression resistance mechanism includes the reinforcing rib, and the reinforcing rib is wound on the outside of the heat insulating layer, the protection layer is sleeved on the outside of the reinforcing rib, and the front and rear ends of the protection layer outside are provided with the sealing ring.

[0010] Further, the reinforcing rib is arranged in a spiral shape, and the inner wall of the protection layer is fitted with the outer side of the reinforcing rib.

[0011] Further, the sealing ring is symmetrically distributed about the vertical axis of the protection layer, and the inner side of the sealing ring is tightly fitted with the outer side of the protection layer.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. Through the design of multilayer structure, heat insulation, corrosion resistance, strong bonding and other functions are integrated, the oil and gas conveying pipeline is protected in all directions, and the service life of the pipeline is effectively prolonged.

[0014] Further, the material of the reinforcing layer can be polymer cement mortar, which can protect the steel pipe from corrosion medium, block the corrosion material by its good barrier property, and improve the rough state of the inner surface of the steel pipe to make it smoother and reduce the flow resistance of the medium, and enhance the pressure resistance of the pipe to provide stable guarantee for smooth oil and gas transportation.

[0015] Further, the material of the heat insulation layer should be nano aerogel felt, which has very low thermal conductivity (0.015-0.025 W / (m·K)) and can significantly reduce the heat loss of the pipeline or the influence of external high temperature on the pipe material (such as ice blocking protection of gas pipeline or heat insulation in high temperature area), and can withstand-200℃-650℃ extreme temperature.

[0016] 2. The bonding layer uses modified acrylate adhesive, which has strong adhesion to the surface of the oil and gas pipeline, so that it can still form a stable and reliable bond with the surface of the pipeline even if it encounters oil stains, moisture or even trace amounts of corrosion products on the surface of the pipeline, reduces the falling situation, and lays a solid foundation for long-term protection and repair. Further, through testing, the repaired position can withstand-40-150℃ temperature for a long time, has strong heat resistance, thermal stability: thermal expansion coefficient≤3×10 -5 / ℃, strength retention rate>85% after 2000 hours of thermal aging; construction convenience: single pipe segment length 1.5m, bending radius≥1.5D. Sealing reliability: no leakage under 12MPa pressure test; service life: expected to be 5 years of maintenance-free period. The prefabricated lining structure can also be cut to meet the actual demand. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a front view structural schematic diagram of the utility model.

[0018] Figure 2 It is a front view sectional structural schematic diagram of the utility model.

[0019] Figure 3 It is an explosion structural schematic diagram of the utility model.

[0020] Figure 4 It is an explosion structural schematic diagram of the bonding structure of the utility model.

[0021] Figure 5 It is an explosion structural schematic diagram of the compression resistance structure of the utility model.

[0022] Figure 6The utility model discloses a structure diagram of reinforcing structure. In the drawing: 1, conveying pipeline body, 2, adhesive layer, 3, base layer, 4, heat insulation layer, 5, reinforcing rib, 6, protective layer, 7, sealing ring, 8, fixed groove, 9, fixed lug, 10, reinforcing layer, 11, reinforcing layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] Embodiment one: the technical scheme shown in the utility model discloses a kind of external repair structures for oil and gas conveying pipeline, which is used to solve the problem that conveying pipeline body 1 and adhesive layer 2 are not firm enough and prone to falling off when splicing. Figure 1 、 Figure 2 、 Figure 3 And Figure 4 The height of fixed lug 9 is 0.1-0.15mm, and fixed lug 9 is distributed at the inside of adhesive layer 2 at equal angle.

[0025] In this example, conveying pipeline body 1 surface is provided with fixed lug 9 with height of 0.1-0.15mm, fixed lug 9 is embedded in the reinforcing layer 10 opened in the inside of adhesive layer 2, to enhance the firmness when contact of contact surface of bonding and contact, thereby providing long-term, efficient protection and repair for pipeline.

[0026] Embodiment two: as shown in the utility model discloses a kind of external repair structures for oil and gas conveying pipeline, which is used to solve the problem that conveying pipeline body 1 and adhesive layer 2 are not firm enough and prone to falling off when splicing. Figure 1 、 Figure 2 And Figure 6The technical scheme shown, in order to solve the problem of the structure strength of the repaired outer lining structure in use is prone to deformation at high temperature: the outer repair structure for oil and gas pipeline discloses a compression-resistant mechanism, the outer side of the heat insulation layer 4 is provided with a protective layer 6, and both ends of the protective layer 6 are provided with a compression-resistant mechanism for increasing the structural strength; the compression-resistant mechanism comprises a reinforcing rib 5, and the reinforcing rib 5 is wound outside the heat insulation layer 4, the protective layer 6 is sleeved outside the reinforcing rib 5, and both ends of the protective layer 6 outside are provided with a sealing ring 7; the reinforcing rib 5 is arranged in a spiral shape, and the inner wall of the protective layer 6 is attached to the outer side of the reinforcing rib 5; the sealing ring 7 is symmetrically distributed about the vertical central axis of the protective layer 6, and the inner side of the sealing ring 7 is tightly attached to the outer side of the protective layer 6.

[0027] In this case, the high-temperature-resistant sealing ring 7 is sleeved at both ends of the protective layer 6, the sealing ring 7 has good elasticity and high-temperature resistance, can maintain good sealing effect in a high-temperature environment, and effectively prevents leakage of the thermal medium; the outer wall of the heat insulation layer 4 is provided with a plurality of spiral reinforcing ribs 5, the reinforcing rib 5 is made of a metal alloy material, preferably a nickel-based alloy, the reinforcing ribs can further enhance the structural strength of the outer lining pipe body, prevent deformation under high temperature and high pressure, and assist the advancement and positioning of the outer lining pipe body during pipeline installation by frictional contact with the inner wall of the original oil and gas pipeline, thereby ensuring the accuracy and stability of installation.

[0028] Embodiment three: as shown in Figure 1 , Figure 2 and Figure 5 The technical scheme shown, in order to solve the problem of the structure strength of the repaired outer lining structure in use is prone to deformation at high temperature: the outer repair structure for oil and gas pipeline discloses a compression-resistant mechanism, the outer side of the heat insulation layer 4 is provided with a protective layer 6, and both ends of the protective layer 6 are provided with a compression-resistant mechanism for increasing the structural strength; the compression-resistant mechanism comprises a reinforcing rib 5, and the reinforcing rib 5 is wound outside the heat insulation layer 4, the protective layer 6 is sleeved outside the reinforcing rib 5, and both ends of the protective layer 6 outside are provided with a sealing ring 7; the reinforcing rib 5 is arranged in a spiral shape, and the inner wall of the protective layer 6 is attached to the outer side of the reinforcing rib 5; the sealing ring 7 is symmetrically distributed about the vertical central axis of the protective layer 6, and the inner side of the sealing ring 7 is tightly attached to the outer side of the protective layer 6.

[0029] In the example, the polymer cement mortar is used as the reinforcing layer 11, the polymer is introduced into the cement mortar, the bonding strength is greatly improved, the bonding strength of the original pure mortar is 0.16 MPa, the bonding strength is improved to 0.24 MPa, the sealing performance of the design material after reinforcement reaches 12 MPa, the reinforcing layer 11 is closely connected with the pipe wall; secondly, the structural strength of the mortar itself can resist external erosion; thirdly, in the face of the deformation of the pipeline caused by temperature change, geological stress and other factors, the reinforcing layer 11 keeps a closely adhered state, effectively prevents corrosion hidden dangers caused by the gap generated by the deformation; the glass fiber axial woven fabric is selected as the reinforcing layer 10, one or more layers of glass fiber axial woven fabric are immersed in the polymer cement mortar, the number of layers is flexible and changeable, and the number of layers depends on the thickness requirement of the external repair structure. The glass fiber axial woven fabric has excellent tensile strength and flexibility, effectively disperses stress, prevents the structure from being damaged due to excessive local stress, and further strengthens the overall protection performance. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An external repair structure for an oil and gas pipeline, comprising a pipeline body (1), wherein an adhesive layer (2) is bonded to the outside of the pipeline body (1), and two base layers (3) are sleeved on the outside of the adhesive layer (2), and a heat insulation layer (4) is fixedly connected to the outside of the base layer (3). Its features are: A reinforcing mechanism for increasing bonding strength is provided at one end between the two base layers (3). The reinforcing mechanism includes three reinforcing layers (10), and the three reinforcing layers (10) are respectively bonded to the inner wall and outer wall of the two base layers (3). A reinforcing layer (11) is bonded between the reinforcing layers (10). The outer side of the heat insulation layer (4) is provided with a protective layer (6), and both ends of the protective layer (6) are provided with a compression-resistant mechanism to increase the structural strength.

2. The external repair structure for oil and gas pipelines according to claim 1, characterized in that: The reinforcing layer (10) and the strengthening layer (11) are bonded together in a staggered manner, and the length of the reinforcing layer (10) is equal to the length of the strengthening layer (11).

3. The external repair structure for oil and gas pipelines according to claim 2, characterized in that: The inner side of the adhesive layer (2) is fixedly connected to a fixing protrusion (9), and the outer side of the conveying pipe body (1) is provided with a fixing groove (8) that matches the fixing protrusion (9).

4. An external repair structure for oil and gas pipelines according to claim 3, characterized in that: The height of the fixing protrusion (9) is 0.1mm-0.15mm, and the fixing protrusion (9) is distributed at equal angles on the inner side of the adhesive layer (2).

5. An external repair structure for oil and gas pipelines according to claim 4, characterized in that: The pressure-resistant mechanism includes a reinforcing rib (5), which is wrapped around the outside of the heat insulation layer (4). The protective layer (6) is fitted over the outside of the reinforcing rib (5), and sealing rings (7) are provided at both the front and rear ends of the protective layer (6).

6. An external repair structure for oil and gas pipelines according to claim 5, characterized in that: The reinforcing rib (5) is arranged in a spiral shape, and the inner wall of the protective layer (6) is attached to the outer side of the reinforcing rib (5).

7. An external repair structure for oil and gas pipelines according to claim 6, characterized in that: The sealing ring (7) is symmetrically distributed about the vertical central axis of the protective layer (6), and the inner side of the sealing ring (7) is tightly fitted with the outer side of the protective layer (6).

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