Flexible pipe framework layer structure

Abstract

The utility model provides a flexible pipe skeleton layer structure, which is formed by staggering a plurality of special-shaped belts end to end, each special-shaped belt comprises a first special-shaped part and a second special-shaped part, and the first special-shaped part and the second special-shaped part are connected end to end to form the special-shaped belt. Comprising a rectangular groove, a V-shaped groove and a unilateral V-shaped groove so as to simulate microstructures of organisms such as desert lizards, scorpions and tamarisk willows in nature, so that the motion trail of solid particles in fluid is effectively changed, the frequency of directly impacting the pipe wall by the particles is reduced, and the erosive wear of a pipeline is reduced; under the same working condition, the maximum erosion rate of the two-dimensional original skeleton layer obtained through simulation calculation by adopting a DNV model is 4.99 * 10 <-12 > kg / m < 2 >. S, the maximum erosion rate of the V-shaped skeleton layer is 4.34 * 10 <-12 > kg / m < 2 >. S, and the improved erosion rate is smaller than that of the original skeleton layer.

Description

Technical Field

[0001] The utility model relates to a flexible pipe skeleton layer structure, belonging to the field of flexible pipeline skeleton layer structures. Background Art

[0002] Flexible pipelines are critical equipment for offshore oil and gas extraction, boasting strong corrosion resistance, low bending stiffness, and the ability to withstand significant deformation. Their complex structure comprises multiple layers of metallic and non-metallic piping. The skeleton layer, the innermost layer of the flexible pipeline, absorbs external fluid pressure and prevents the pipeline from collapsing under excessive pressure. Its structure significantly impacts oil and gas transportation efficiency and the service life of the flexible pipeline.

[0003] For example, the existing application number is CN201821471298.4, and the patent application name is a skeleton layer and a composite flexible pipe for marine flexible pipes, which discloses that the skeleton layer includes a first special-shaped belt and a second special-shaped belt; the first special-shaped belt is spirally wound to form a tubular skeleton layer body, and the inner surface of the skeleton layer body is formed with a spiral groove; the first special-shaped belt and the second special-shaped belt are staggered and spirally wound to close the opening of the spiral groove. The skeleton layer structure of the utility model is simple and the design is reasonable. It effectively solves the flow-induced vibration and humming problems generated by the flow in the existing flexible composite pipe containing a skeleton layer, can make the internal oil and gas fluid flow smoother, avoid the generation of vortices and flow-induced vibration, greatly improve the safety of oil and gas transportation in marine flexible pipes, and can be widely used in marine oil and gas composite flexible pipe structures.

[0004] For example, the flexible pipe skeleton layer commonly used in current commercial applications is shown in the attached figure of the specification. Figure 1 As shown in the figure, the innermost structure in direct contact with the fluid has a rough surface with a groove-like geometry, not a smooth surface. During oil and gas production and transportation, the fluid may carry solid particles such as sand and scale. When these particles strike the pipe wall at high velocities, the surface material deforms or even breaks off, causing erosion damage to the pipe surface. This thins the pipe wall and reduces its ability to withstand external pressure, leading to pipeline failure and accidents such as oil and gas leaks. This increases manufacturing and maintenance costs, and poses a significant threat to the structure and performance of flexible pipes.

[0005] Therefore, the utility model provides a novel flexible pipe skeleton layer structure that takes both strength and erosion resistance into consideration. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide a new flexible pipe skeleton layer structure that takes into account both strength and erosion resistance.

[0007] The utility model is achieved in this way:

[0008] A flexible pipe skeleton layer structure is composed of a plurality of shaped belts staggered end to end, wherein the shaped belts include a first shaped portion and a second shaped portion, the first shaped portion and the second shaped portion are connected end to end to form the shaped belt, the first shaped portion directly contacts the fluid, and the second shaped portion is staggered and fixed with the first shaped portion of the adjacent shaped belt;

[0009] And the first special-shaped portion is a bionic groove with strength and erosion resistance.

[0010] As a further improvement, the first special-shaped portion is a rectangular groove.

[0011] As a further improvement, the first special-shaped portion includes a first arc-shaped portion, a first vertical portion, a first horizontal portion, a second vertical portion, and a second arc-shaped portion;

[0012] The first horizontal portion has a first vertical portion and a second vertical portion vertically disposed at both ends thereof. The top of the first vertical portion has a first arc portion horizontally disposed thereon, and the first arc portion faces the second special-shaped portion. The top of the second vertical portion is connected by the second arc portion and the second special-shaped portion.

[0013] As a further improvement, the first special-shaped portion is a V-shaped groove.

[0014] As a further improvement, the first special-shaped portion includes a first arc-shaped portion, a first vertical portion, a first horizontal portion, a second vertical portion, a second arc-shaped portion, and a second horizontal portion;

[0015] The first horizontal portion has a first vertical portion and a second vertical portion at both ends thereof at a preset angle A; the top of the first vertical portion is provided with a second arc-shaped portion horizontally through the second horizontal portion; the top of the second vertical portion is connected to the second arc-shaped portion and the second special-shaped portion;

[0016] The preset angle A is 0°-90°.

[0017] As a further improvement, the first special-shaped portion is a single-sided V-shaped groove.

[0018] As a further improvement, the first special-shaped portion includes a first arc-shaped portion, a first vertical portion, a first horizontal portion, a second vertical portion, a second arc-shaped portion, and a second horizontal portion;

[0019] A first vertical portion is provided at one horizontal end of the first horizontal portion at a preset angle A, and a second vertical portion is provided vertically at the other end of the first horizontal portion; a second curved portion is provided at the top end of the first vertical portion through the second horizontal portion; and the top end of the second vertical portion is connected to the second curved portion and the second special-shaped portion.

[0020] The preset angle A is 0°-90°.

[0021] As a further improvement, the second special-shaped portion includes a third horizontal portion, a third arc-shaped portion, and a fourth horizontal portion, and the third horizontal portion, the third arc-shaped portion, and the fourth horizontal portion are sequentially connected to form a hook-shaped structure.

[0022] As a further improvement, the special-shaped belt is a pipe with a diameter of 2-12 inches.

[0023] As a further improvement, the special-shaped belt is closed at both ends.

[0024] The beneficial effects of the utility model are:

[0025] ① This utility model introduces biomimetic groove structures—including rectangular, V-shaped, and single-sided V-shaped grooves—on the surface of the flexible pipe skeleton layer, mimicking the microstructures of natural organisms such as desert lizards, scorpions, and strange willows. This effectively alters the trajectory of solid particles in the fluid, reducing the frequency of direct particle impact on the pipe wall and minimizing erosion and wear. Under the same operating conditions, the maximum erosion rate of the original two-dimensional skeleton layer calculated using the DNV model was 4.99×10-12kg / m2·s, while the maximum erosion rate of the V-shaped skeleton layer was 4.34×10-12kg / m2·s. The improved erosion rate is lower than that of the original skeleton layer.

[0026] ② The utility model improves the flow field shape by having a skeleton layer with bionic grooves of different shapes, and the guiding effect on the particles in the fluid is enhanced. The rectangular grooves help to evenly guide the particles to move along a certain trajectory to avoid large-area erosion; the V-shaped grooves further divert the particles through their tip structure to reduce local impact force; the unilateral V-shaped grooves produce flow guidance on one side, so that the particles avoid the most vulnerable areas, thereby effectively extending the service life of the pipeline.

[0027] ③ The bionic groove design of this utility model significantly reduces the turbulence on the pipe surface and optimizes the fluid dynamics performance. This effect of reducing turbulence not only reduces energy consumption, but also improves the overall flow efficiency of the pipe, while reducing long-term erosion of the pipe wall, making the pipe perform better in high flow rate environments.

[0028] ④ The utility model utilizes the natural optimized structure of the bionic groove, so that its manufacturing cost does not increase significantly, but by reducing erosion and extending the life of the pipeline, it significantly reduces the long-term maintenance and replacement costs and improves the durability of the pipeline in harsh environments.

[0029] In summary, the improved groove configuration slows down pipeline erosion, takes into account the critical crush value of the skeleton layer, ensures the crush resistance of the flexible pipeline, and improves the buckling performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the original flexible pipe skeleton layer structure provided by the background technology of the present utility model.

[0032] Figure 2 This is a schematic diagram of the flexible pipe skeleton layer structure provided in Example 1 of the present utility model.

[0033] Figure 3 This is a schematic diagram of the practical application of the flexible pipe skeleton layer structure provided in Example 1 of the present utility model.

[0034] Figure 4 This is a schematic diagram of the flexible tube skeleton layer structure provided in Example 2 of the present utility model.

[0035] Figure 5 This is a schematic diagram of the practical application of the flexible pipe skeleton layer structure provided in Example 2 of the present utility model.

[0036] Figure 6 This is a schematic diagram of the flexible tube skeleton layer structure provided in Example 3 of the present utility model.

[0037] Figure 7 This is a schematic diagram of the practical application of the flexible pipe skeleton layer structure provided in Example 3 of the present utility model.

[0038] Figure 8 This is a schematic diagram of the dimension markings of the flexible tube skeleton layer structure provided in Examples 1-3 of the present invention.

[0039] Figure 9 This is an erosion distribution diagram of the flexible pipe skeleton layer structure provided by Examples 1-3 of the present invention and the background technology. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically specified.

[0042] Example 1

[0043] Reference Figure 2 and 3 As shown, combined with Figure 8 ; This embodiment provides a specific implementation method for a flexible pipe skeleton layer structure, which is composed of several special-shaped belts staggered end to end, and the special-shaped belt includes a first special-shaped portion 10 and a second special-shaped portion 20. The first special-shaped portion 10 and the second special-shaped portion 20 are connected at both ends to form a special-shaped belt. The first special-shaped portion 10 is in direct contact with the fluid, and the second special-shaped portion 20 is staggered and fixed with the first special-shaped portion 10 of the adjacent special-shaped belt; and the first special-shaped portion 10 is a bionic groove with strength and erosion resistance.

[0044] The utility model extracts different groove shapes and arrangements from the surfaces of creatures such as desert lizards, shark skin, strange willows, and scorpions to form bionic grooves, which can effectively reduce turbulence and guide particles in the fluid to move along specific paths, thereby reducing the frequency of particles directly hitting the pipe wall, and then optimizing the particle movement trajectory, reducing the erosion rate of the flexible pipe skeleton layer in high flow rate environments, and is particularly suitable for conveying fluids with high sand content.

[0045] The second special-shaped portion 20 includes a third horizontal portion 201, a third arc-shaped portion 202, and a fourth horizontal portion 203. The third horizontal portion 201, the third arc-shaped portion 202, and the fourth horizontal portion 203 are sequentially connected to form a hook-shaped structure to ensure that adjacent skeleton layers are locked with each other.

[0046] In one specific embodiment, the special-shaped belt is a pipe with a diameter of 2-12 inches.

[0047] Furthermore, the ends of the special-shaped belt are sealed, so as to prevent the fluid from entering from both ends of the special-shaped belt and eroding the pipe wall of the special-shaped belt, thereby causing double erosion.

[0048] The first special-shaped portion 10 is a rectangular groove.

[0049] Furthermore, the first special-shaped portion 10 comprises a first arc-shaped portion 101 , a first vertical portion 102 , a first horizontal portion 103 , a second vertical portion 104 and a second arc-shaped portion 105 ;

[0050] The first horizontal portion 103 has a first vertical portion 102 and a second vertical portion 104 vertically disposed at both ends thereof. A first arc-shaped portion 101 is horizontally disposed at the top of the first vertical portion 102, and the first arc-shaped portion 101 faces the second special-shaped portion 20. The top of the second vertical portion 104 is connected to the second special-shaped portion 20 via a second arc-shaped portion 105.

[0051] Combine Figure 8 The first special-shaped portion 10 is a rectangular groove, that is, the flow field boundary is rectangular, and the first vertical portion 102 and the second vertical portion 104 are both perpendicular to the first horizontal portion 103; the erosion damage at the corner of the rectangular groove entrance is high, so that the erosion damage at the bottom of the groove is almost zero, and the stress is relatively high in the area with the highest erosion rate; due to the microstructure of the rectangular groove, the flow field changes, which directly affects the incident particles, and the energy dissipation inside the groove is enhanced. As the particles enter the groove, the particle velocity decreases significantly, resulting in reduced erosion damage on the material surface.

[0052] Example 2

[0053] Reference Figure 4 and 5 As shown, this embodiment differs from the first embodiment in that the structure and shape of the first special-shaped portion are different, and the first special-shaped portion 10 is a V-shaped groove.

[0054] Furthermore, the first special-shaped portion 10 includes a first arc-shaped portion 101, a first vertical portion 102, a first horizontal portion 103, a second vertical portion 104, a second arc-shaped portion 105, and a second horizontal portion;

[0055] The first horizontal portion 103 has a first vertical portion 102 and a second vertical portion 104 at both ends thereof at a preset angle A. The top of the first vertical portion 102 is provided with a second curved portion 105 horizontally through the second horizontal portion. The top of the second vertical portion 104 is connected to the second special-shaped portion 20 through the second curved portion 105.

[0056] The preset angle A is 0°-90°.

[0057] Combine Figure 8 The first profiled portion 10 is a V-shaped groove, meaning the flow field boundary is V-shaped. The first vertical portion 102 and the second vertical portion 104 both form an angle A with the first horizontal portion 103. The flow field, particle impact velocity, and impact angle are all affected by the V-shaped microstructure. Stress is concentrated at the bottom of the V-shaped groove, while stress on the groove surface is lower. At low incident angles, the lower region of the V-shaped groove narrows, allowing fewer particles to enter the groove bottom, thereby reducing buffer erosion damage.

[0058] It should be noted that the implementation principle and technical effects of this embodiment are the same as those of the first embodiment. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment.

[0059] Example 3

[0060] Reference Figure 6 and 7 As shown, this embodiment differs from the first embodiment in that the structure and shape of the first special-shaped portion are different, and the first special-shaped portion 10 is a single-sided V-shaped groove.

[0061] As a further improvement, the first deformed portion 10 includes a first curved portion 101, a first vertical portion 102, a first horizontal portion 103, a second vertical portion 104, a second curved portion 105, and a second horizontal portion; the first horizontal portion 103 has the first vertical portion 102 at one horizontal end at a preset angle A, and the second vertical portion 104 is vertically provided at the other end of the first horizontal portion 103; the top end of the first vertical portion 102 is horizontally provided with the second curved portion 105 through the second horizontal portion; the top end of the second vertical portion 104 is connected to the second deformed portion 20 via the second curved portion 105;

[0062] The preset angle A is 0°-90°.

[0063] Combine Figure 8The first special-shaped portion 10 is a unilateral V-shaped groove, and the first vertical portion 102 and the second vertical portion 104 both form an angle A with the first horizontal portion 103. The first horizontal portion 103 forms an angle with the first vertical portion 102, and the first horizontal portion 103 and the second vertical portion 104 are perpendicular. The unilateral V-shaped groove structure has a slope with a certain angle on one side and a vertical side on the other side. When particles enter. At the slope side, the entrance corner of the groove changes the particle incident angle, resulting in fewer particles entering the interior of the groove. At the same time, the erosion damage at the corner of the slope side is more serious, protecting the materials of the vertical side and the bottom surface, and slowing down internal erosion.

[0064] It should be noted that the implementation principle and technical effects of this embodiment are the same as those of the first embodiment. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment.

[0065] Experimental testing:

[0066] according to Figure 8 As shown, the horizontal length, arc length, and radius of each component are marked, and the parameters are selected to obtain the structural parameters of the new flexible pipeline skeleton layer in Table 1. According to the parameters of the flexible pipeline skeleton layer structure in Table 1, the maximum erosion rate of the two-dimensional original skeleton layer is calculated by DNV model simulation under the same working conditions, and the erosion calculation results of the new flexible pipeline skeleton layer in Table 2 are obtained. Figure 9 Erosion distribution diagram shown.

[0067] Table 1 Structural parameters of the new flexible pipe skeleton layer

[0068]

[0069]

[0070] Table 2 Calculation results of erosion of the skeleton layer of the new flexible pipeline

[0071]

[0072] In summary, compared with the original flexible tube skeleton layer, the unilateral V-shaped and rectangular flexible tube skeleton layers can maintain their original functions after changing their shapes, while the erosion resistance of the V-shaped flexible tube skeleton layer is reduced by about 13%. Figure 9 The area with the most severe erosion damage to the pipe wall is distributed inside the groove, indicating that the introduction of bionic groove structures on the surface of the flexible pipe skeleton layer, including rectangular, V-shaped and single-sided V-shaped grooves, to imitate the microstructure of organisms such as desert lizards, scorpions and strange willows in nature, changes the movement trajectory of solid particles in the fluid, thereby affecting the position where the particles hit the pipe wall, reducing the frequency of direct particle impact on the pipe wall, and reducing erosion wear of the pipeline.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A flexible tube skeleton layer structure, characterized in that: The special-shaped belt is composed of a plurality of special-shaped belts staggered end to end, and the special-shaped belt comprises a first special-shaped portion (10) and a second special-shaped portion (20), the first special-shaped portion (10) and the second special-shaped portion (20) are connected end to end to form the special-shaped belt, the first special-shaped portion (10) directly contacts the fluid, and the second special-shaped portion (20) is staggered and fixed with the first special-shaped portion (10) of the adjacent special-shaped belt; Furthermore, the first special-shaped portion (10) is a bionic groove having strength and erosion resistance.

2. The flexible pipe skeleton layer structure according to claim 1, characterized in that: The first special-shaped portion (10) is a rectangular groove.

3. The flexible pipe skeleton layer structure according to claim 2, characterized in that: The first special-shaped portion (10) comprises a first arc-shaped portion (101), a first vertical portion (102), a first horizontal portion (103), a second vertical portion (104) and a second arc-shaped portion (105); The first horizontal portion (103) has a first vertical portion (102) and a second vertical portion (104) vertically arranged at both ends thereof, a first arc-shaped portion (101) being horizontally arranged at the top end of the first vertical portion (102), and the first arc-shaped portion (101) facing the second special-shaped portion (20), and a top end of the second vertical portion (104) being connected to the second special-shaped portion (20) via a second arc-shaped portion (105).

4. The flexible pipe skeleton layer structure according to claim 1, characterized in that: The first special-shaped portion (10) is a V-shaped groove.

5. The flexible pipe skeleton layer structure according to claim 4, characterized in that: The first special-shaped portion (10) comprises a first arc-shaped portion (101), a first vertical portion (102), a first horizontal portion (103), a second vertical portion (104), a second arc-shaped portion (105), and a second horizontal portion; The first horizontal portion (103) is provided with a first vertical portion (102) and a second vertical portion (104) at two horizontal ends at a preset angle A. A second arc-shaped portion (105) is provided at the top of the first vertical portion (102) through a second horizontal portion; The top end of the second vertical portion (104) is connected to the second special-shaped portion (20) via the second arc-shaped portion (105); The preset angle A is 0°-90°.

6. The flexible pipe skeleton layer structure according to claim 1, characterized in that: The first special-shaped portion (10) is a single-sided V-shaped groove.

7. The flexible pipe skeleton layer structure according to claim 6, characterized in that: The first special-shaped portion (10) comprises a first arc-shaped portion (101), a first vertical portion (102), a first horizontal portion (103), a second vertical portion (104), a second arc-shaped portion (105), and a second horizontal portion; A first vertical portion (102) is provided at one horizontal end of the first horizontal portion (103) at a preset angle A, and a second vertical portion (104) is vertically provided at the other end of the first horizontal portion (103); A second arc-shaped portion (105) is provided at the top of the first vertical portion (102) through a second horizontal portion; The top end of the second vertical portion (104) is connected to the second special-shaped portion (20) via the second arc-shaped portion (105); The preset angle A is 0°-90°.

8. The flexible pipe skeleton layer structure according to claim 1, characterized in that: The second special-shaped portion (20) comprises a third horizontal portion (201), a third arc-shaped portion (202), and a fourth horizontal portion (203), wherein the third horizontal portion (201), the third arc-shaped portion (202), and the fourth horizontal portion (203) are sequentially connected to form a hook-shaped structure.

9. The flexible pipe skeleton layer structure according to claim 1, characterized in that: The special-shaped belt is a pipe with a diameter of 2-12 inches.

10. The flexible pipe skeleton layer structure according to claim 9, characterized in that: The special-shaped belt is closed at both ends.

Images