Design method and apparatus for multi-scale composite material tubing

Abstract

This invention provides a design method for multi-scale composite material tubing, comprising: selecting a composite matrix, composite particle reinforcement, and composite fiber reinforcement through learning and screening from a material database; based on the basic idea of ​​macroscopic finite element simulation, calculating the optimal content of composite particle reinforcement with different contents using a two-dimensional finite element model; adding composite fiber reinforcement to the two-dimensional finite element model to obtain a three-dimensional equivalent matrix model, and calculating the strength of the three-dimensional equivalent matrix model; and laying long fibers at different angles on the three-dimensional equivalent matrix model and performing finite element simulation calculations to obtain the optimal long fiber laying angle. This invention utilizes extruded particles and short fibers to form an equivalent matrix, and lays long fibers in a multi-scale reinforced composite material tubing, which, while meeting design requirements, is lightweight and suitable for long-term use in environments with room temperature and 200°C.

Description

Technical Field

[0001] This invention relates to the field of pipeline design technology, and more specifically, to a design method and apparatus for multi-scale composite material oil pipes. Background Technology

[0002] Metal pipelines in my country are widely and maturely used in oilfield exploration and development, oil and gas transportation, and refining and chemical industries, with over 95% domestically produced. However, with the increasing prevalence of deep wells and harsh geological environments, as well as the increasing high pressure and high corrosion in oil and gas pipelines and refining and chemical pipelines, corrosion is intensifying year by year, seriously affecting the environment and personal safety. Traditional metals can no longer meet application requirements. Non-metallic and composite material oil pipes, due to their corrosion resistance, light weight, and low overall cost, are increasingly widely used in oil and gas transportation. The promotion and application of non-metallic and composite material oil pipes in oil and gas fields can not only solve the corrosion problem of oilfield pipeline networks but also help alleviate the operational difficulties of upstream sectors of oilfield companies. Composite material oil pipes do not experience corrosion, rust, or scaling like steel pipes during long-term service, thus ensuring their normal operation. Resin-based composite materials, also known as fiber-reinforced plastics, are fiber-reinforced materials with organic polymers as the matrix.

[0003] China's resin-based composite materials industry began in 1958, initially for military products, and then gradually expanded to civilian applications. Through the large-scale introduction of advanced foreign technologies, its development has been quite rapid. Currently, a complete industrial system has been formed, encompassing research, design, production, and raw material supply. Products are mainly used in construction, corrosion protection, light industry, transportation, petrochemicals, water supply and drainage engineering, shipbuilding, and other industrial fields. However, there are few reports on its application in the design of high-temperature, high-pressure oil pipelines.

[0004] Patent CN201710590329.1 discloses a method for preparing non-metallic oil pipes for use in oil and gas fields. The polyethylene non-metallic oil pipes prepared by this method have excellent mechanical properties, corrosion resistance, wear resistance, and thermal properties, and can be widely used in oil and gas fields to reduce production and maintenance costs and improve oil and gas field production efficiency. However, this method has not been professionally designed and optimized, which inevitably leads to a lot of waste and pollution problems in the early stage of trial production. Moreover, the non-metallic oil pipes manufactured cannot meet the requirements of high temperature and high pressure.

[0005] The 2013 master's thesis from Harbin Institute of Technology, "Preparation and Performance Study of Nanoparticle and Carbon Fiber Reinforced Polyimide Composites," proposed adding a certain amount of nanoparticles to carbon fiber / polymer matrix composites to prepare nanoparticle / carbon fiber / polymer matrix composites. This method can have a positive impact on the interface, thereby improving the mechanical properties of the composites. However, the two-dimensional reinforcement of particles and carbon fibers alone is insufficient to meet the stringent service conditions, and the lack of optimization through finite element simulation in the early stages of the experiment resulted in significant time and cost expenditure.

[0006] Therefore, the present invention provides a design method and apparatus for multi-scale composite material tubing. Summary of the Invention

[0007] To extend the service life of tubing and meet lightweight requirements, enabling vertical well tubing to operate efficiently for longer periods under complex service conditions, and to address the problems of existing technologies, this invention provides a design method for multi-scale composite material tubing, comprising the following steps:

[0008] Through learning and screening of the materials database, composite matrix, composite particle reinforcement and composite fiber reinforcement are selected, wherein the composite fiber reinforcement includes short fiber and long fiber;

[0009] Based on the basic idea of ​​macroscopic finite element simulation, the optimal content of composite particle reinforcement is determined by calculating the composite particle reinforcement with different contents through a two-dimensional finite element model.

[0010] Based on the two-dimensional finite element model, composite fiber reinforcement is added to obtain a three-dimensional equivalent matrix model, and the strength of the three-dimensional equivalent matrix model is calculated.

[0011] Based on the three-dimensional equivalent matrix model, after laying long fibers at different angles and performing finite element simulation calculations, the optimal long fiber laying angle was obtained.

[0012] According to one embodiment of the present invention, considering the adhesion and coefficient of thermal expansion between the composite matrix, the composite particle reinforcement, and the composite fiber reinforcement, it is ensured that the composite matrix, the composite particle reinforcement, and the composite fiber reinforcement have good adhesion and similar coefficients of thermal expansion, so that they can expand synchronously when heated, reducing the possibility of stress cracking.

[0013] According to one embodiment of the present invention, through learning and screening of a material database, bismaleimide resin is determined as the composite material matrix, silicon carbide particles are determined as the composite material particle reinforcement, and carbon fiber is determined as the composite material fiber reinforcement.

[0014] According to one embodiment of the present invention, an optimal particle content and long fiber layup angle were determined through high-throughput calculations.

[0015] According to one embodiment of the present invention, the method comprises:

[0016] Using the concept of materials genome, the content of composite material particle reinforcement was optimized, and two-dimensional finite element models with different particle contents were drawn.

[0017] Based on finite element simulation calculations, stress-strain curves with different particle contents were compared, and the optimal content of particle reinforcement in the composite material was determined by comparing the changing trends.

[0018] According to one embodiment of the present invention, the method comprises:

[0019] Based on the two-dimensional finite element model, a three-dimensional equivalent matrix model containing the optimal content of composite particle reinforcement and the optimal content of composite fiber reinforcement is drawn.

[0020] Based on finite element simulation calculations, the tensile strength, tensile modulus, and shear modulus of the equivalent tubing matrix combining composite particle reinforcement and composite fiber reinforcement were obtained.

[0021] According to one embodiment of the present invention, the method comprises:

[0022] Based on the aforementioned three-dimensional equivalent matrix model, a corresponding equivalent matrix tubing model is drawn.

[0023] A preset layer of long fibers at different angles is laid on the surface of the equivalent matrix tubing model;

[0024] Based on finite element simulation calculations, stress-strain curves for laying long fibers at different angles were calculated, and the optimal solution was obtained by comparing the results.

[0025] According to one embodiment of the present invention, when the content of composite particle reinforcement is 8%, 20% composite fiber reinforcement is added to form an equivalent matrix, and 10 layers of long fibers at different angles [±85 / ±15 / 60 / ±85 / ±15 / -60] are laid, a composite oil pipe that meets the service requirements is obtained.

[0026] According to another aspect of the invention, a storage medium is also provided, which includes a series of instructions for performing the steps of the method described in any of the preceding claims.

[0027] According to another aspect of the present invention, a design apparatus for multi-scale composite tubing is also provided, wherein the multi-scale composite tubing is designed by the method described in any of the preceding claims, the apparatus comprising:

[0028] The selection module is used to select composite matrix, composite particle reinforcement and composite fiber reinforcement through learning and screening of the material database. The composite fiber reinforcement includes short fibers and long fibers.

[0029] The two-dimensional module is used to calculate the optimal content of composite particle reinforcements based on the basic idea of ​​macroscopic finite element simulation.

[0030] A three-dimensional module is used to add composite fiber reinforcement to the two-dimensional finite element model to obtain a three-dimensional equivalent matrix model, and to calculate the strength of the three-dimensional equivalent matrix model.

[0031] The laying module is used to lay long fibers at different angles on the basis of the three-dimensional equivalent matrix model, and then perform finite element simulation calculations to obtain the optimal long fiber laying angle.

[0032] The design method and apparatus for multi-scale composite oil pipes provided by this invention involve extruding particles and short fibers to form an equivalent matrix, upon which long fibers are laid to create a multi-scale reinforced composite oil pipe, achieving lightweight performance while meeting design requirements. It also meets the requirements for long-term use in operating environments at room temperature and 200°C. Furthermore, through finite element simulation calculations and optimization, the optimal particle content and optimal long fiber laying angle were designed.

[0033] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 A flowchart illustrating a design method for multi-scale composite tubing according to an embodiment of the present invention is shown;

[0036] Figure 2 The diagram shows the equivalent stress contour plot of a two-dimensional finite element model with an 8% particle content according to an embodiment of the present invention.

[0037] Figure 3 The equivalent strain cloud diagram of a two-dimensional finite element model with 8% particle content according to an embodiment of the present invention is shown.

[0038] Figure 4 The diagram shows line graphs illustrating the changes in elastic modulus and shear modulus obtained by finite element simulation and subsequent formula calculation when the particles contain 2%, 8%, 18%, 28%, 38%, and 48% of the material, respectively, according to an embodiment of the present invention.

[0039] Figure 5 Line graphs showing the changes in elastic modulus and shear modulus obtained by finite element simulation and subsequent formula calculation after containing 4.5%, 7.5%, 12.5%, 20%, and 25% short fibers respectively, according to an embodiment of the present invention;

[0040] Figure 6 The stress cloud diagram of an equivalent matrix containing 8% particles and about 20% short fibers according to an embodiment of the present invention is shown.

[0041] Figure 7 The strain contour plot of an equivalent matrix containing 8% particles and about 20% short fibers according to an embodiment of the present invention is shown.

[0042] Figure 8 The diagram shows the stress-strain profile of an equivalent matrix according to an embodiment of the present invention.

[0043] Figure 9 An equivalent stress contour plot of a composite material tubing according to an embodiment of the present invention is shown;

[0044] Figure 10 The equivalent elastic strain contour plot of a composite material tubing according to an embodiment of the present invention is shown.

[0045] Figure 11 The equivalent plastic strain contour plot of a composite material tubing according to an embodiment of the present invention is shown;

[0046] Figure 12 The diagram shows the laying angle contour of a composite material tubing according to an embodiment of the present invention;

[0047] Figure 13 Stress-strain curves for different long fiber layup angles according to an embodiment of the present invention are shown;

[0048] Figure 14 Stress-strain curves at room temperature and 200°C for different long fiber layup angles according to an embodiment of the present invention are shown; and

[0049] Figure 15 A structural block diagram of a design device for multi-scale composite tubing according to an embodiment of the present invention is shown. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] Figure 1 A flowchart illustrating a design method for multi-scale composite tubing according to an embodiment of the present invention is shown.

[0052] like Figure 1 In step S101, through learning and screening of the material database, composite matrix, composite particle reinforcement and composite fiber reinforcement are selected. Composite fiber reinforcement includes short fiber and long fiber.

[0053] Specifically, considering the adhesion and coefficient of thermal expansion between the composite matrix, composite particle reinforcement, and composite fiber reinforcement, it is necessary to ensure that the composite matrix, composite particle reinforcement, and composite fiber reinforcement have good adhesion and similar coefficients of thermal expansion, so that they can expand synchronously when heated, reducing the possibility of stress cracking.

[0054] Furthermore, the material database and high-throughput computing from the materials genome concept were used. Through learning and screening of the material database, bismaleimide resin was determined as the composite matrix, silicon carbide particles as the composite particle reinforcement, and carbon fiber as the composite fiber reinforcement. Through high-throughput computing, the optimal particle content and long fiber layup angle were determined.

[0055] like Figure 1 In step S102, based on the basic idea of ​​macroscopic finite element simulation, the composite material particle reinforcement with different contents is calculated by a two-dimensional finite element model to determine the optimal content of the composite material particle reinforcement.

[0056] Specifically, the concept of materials genome is adopted to optimize the content of composite material particle reinforcement and draw two-dimensional finite element models with different particle contents.

[0057] Furthermore, based on finite element simulation calculations, a comparison chart of stress-strain curves with different particle contents was obtained, and the optimal content of particle reinforcement in the composite material was determined by comparing the changing trends.

[0058] like Figure 1 In step S103, a composite fiber reinforcement is added to the two-dimensional finite element model to obtain a three-dimensional equivalent matrix model, and the strength of the three-dimensional equivalent matrix model is calculated.

[0059] Specifically, based on the two-dimensional finite element model, a three-dimensional equivalent matrix model containing composite particle reinforcement with optimal content and composite fiber reinforcement with optimal content is drawn.

[0060] Furthermore, based on finite element simulation calculations, the tensile strength, tensile modulus, and shear modulus of the equivalent tubing matrix combining composite particle reinforcement and composite fiber reinforcement were obtained.

[0061] like Figure 1 In step S104, based on the three-dimensional equivalent matrix model, long fibers at different angles are laid out and finite element simulation calculations are performed to obtain the optimal long fiber laying angle.

[0062] Specifically, based on the three-dimensional equivalent matrix model, the corresponding equivalent matrix tubing model is drawn.

[0063] Furthermore, a preset layer of long fibers at different angles is laid on the surface of the equivalent matrix tubing model. In one embodiment, the preset layer consists of 10 layers.

[0064] Furthermore, based on finite element simulation calculations, stress-strain curves for laying long fibers at different angles were calculated, and the optimal solution was obtained by comparing the results.

[0065] In one embodiment, when the content of composite particle reinforcement is 8%, 20% composite fiber reinforcement is added to form an equivalent matrix, and 10 layers of long fibers at different angles [±85 / ±15 / 60 / ±85 / ±15 / -60] are laid with a total thickness of 4 mm to obtain a composite oil pipe that meets the service requirements and has the best internal pressure resistance.

[0066] In summary, a multi-scale composite tubing laying scheme incorporating nanoparticles, short fibers, and long fibers with a multi-layered structure was designed and optimized using finite element simulation. Using bismaleimide resin as the matrix, a 2mm thick tubing substrate was formed by extrusion molding with 8% SiC nanoparticles and short carbon fibers as reinforcement. Subsequently, 10 layers of long carbon fibers as the matrix were laid on this substrate, totaling 4mm in thickness. The optimal internal pressure resistance was achieved when the laying angle was [±85 / ±15 / 60 / ±85 / ±15 / -60], and the system still met the requirements under a service environment of 210℃.

[0067] In one embodiment, based on the concept of materials genome, bismaleimide resin is identified as the composite matrix, SiC as the composite particle reinforcement, and carbon fiber as the composite fiber reinforcement.

[0068] First, two-dimensional finite element models with different particle contents are drawn. Without changing any variables other than the particle reinforcement content of the composite material, the stress-strain curves corresponding to different particle contents in the two-dimensional model are calculated using finite element simulation (e.g., ...). Figure 4By comparing the trends of various changes, the particle content corresponding to the optimal performance was determined. Based on this calculation result, it was found that the optimal strength performance trend was achieved when the particle content was 8% (e.g., ...). Figure 2 as well as Figure 3 ).

[0069] Secondly, calculations were performed on composite materials with short fiber additions of 4.5%, 7.5%, 12.5%, 20%, and 25%. The results showed that the composite material with the highest addition amount (20%) exhibited the best shear modulus and also had a relatively high elastic modulus. Therefore, in the three-dimensional equivalent matrix model, adding 20% ​​short fibers (e.g., ...) was chosen. Figure 5 ).

[0070] Based on the optimized particle content ratio described above, an additional 8% particle content and 20% short fiber content were added to create a three-dimensional equivalent matrix model (e.g., Figures 6-7 Based on finite element simulation calculations, parameters such as tensile strength, tensile modulus, and shear modulus of the equivalent matrix are obtained through finite element simulation calculations (e.g., ...). Figure 8 ).

[0071] Based on the constitutive relations described above, a 2mm thick circular tube was drawn as an equivalent matrix model, and 10 layers of long fibers at different angles were laid on its outer surface. Based on the finite element simulation calculation, by changing different laying schemes, the stress-strain curves corresponding to the long fibers at different laying angles were calculated. From the curves, the tensile strength corresponding to different schemes can be derived, and the optimal tensile strength corresponding to the laying scheme is found to be [±85 / ±15 / 60 / ±85 / ±15 / -60].

[0072] Figures 9-12 The diagram shows the equivalent stress cloud map, equivalent elastic strain cloud map, equivalent plastic strain cloud map, and lay-up angle cloud map of the composite tubing corresponding to the equivalent matrix made of particles and short fibers and 10 layers of long fibers laid on it, with lay-up angles of [±85 / ±15 / 60 / ±85 / ±15 / -60]. Figure 13 The display shows the stress-strain curves plotted after finite element simulation calculations, which include an equivalent matrix made of particles and short fibers and 10 layers of long fibers laid on it, with different long fiber layup angles.

[0073] Finally, to determine whether the present invention can still meet the design requirements at 200°C, the above optimal solution was further subjected to finite element simulation calculations at 200°C, and it was found that its performance still meets the service requirements. Figure 14 The display shows the stress-strain curves at room temperature and 200°C for different long fiber layup angles, calculated by finite element simulation after only changing the temperature parameter.

[0074] The present invention also provides a storage medium comprising a series of instructions for performing design method steps for multi-scale composite tubing.

[0075] Figure 15 A structural block diagram of a design device for multi-scale composite tubing according to an embodiment of the present invention is shown.

[0076] like Figure 15 As shown, the design device 1500 includes a selection module 1501, a two-dimensional module 1502, a three-dimensional module 1503, and a laying module 1504.

[0077] The selection module 1501 is used to select composite matrix, composite particle reinforcement and composite fiber reinforcement through learning and screening of the material database. Composite fiber reinforcement includes short fiber and long fiber.

[0078] The two-dimensional module 1502 is used to calculate the optimal content of composite particle reinforcement based on the basic idea of ​​macroscopic finite element simulation. It uses a two-dimensional finite element model to calculate the composite particle reinforcement with different contents.

[0079] The 3D module 1503 is used to add composite fiber reinforcement to a 2D finite element model to obtain a 3D equivalent matrix model, and to calculate the strength of the 3D equivalent matrix model.

[0080] The laying module 1504 is used to lay long fibers at different angles on the basis of a three-dimensional equivalent matrix model, and then perform finite element simulation calculations to obtain the optimal long fiber laying angle.

[0081] In summary, the design method and apparatus for multi-scale composite material tubing provided by this invention involves extruding particles and short fibers to form an equivalent matrix, upon which long fibers are laid to create a multi-scale reinforced composite material tubing. This achieves lightweight performance while meeting design requirements. It also meets the requirements for long-term use in operating environments at room temperature and 200°C. Furthermore, through finite element simulation calculations and optimization, the optimal particle content and optimal long fiber laying angle were designed.

[0082] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0083] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0084] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A design method for multi-scale composite material tubing, characterized in that, The multi-scale composite tubing is designed for use in service environments at room temperature and 200°C. The method includes the following steps: Through learning and screening of the materials database, composite matrix, composite particle reinforcement and composite fiber reinforcement are selected, wherein the composite fiber reinforcement includes short fiber and long fiber; Based on the basic idea of ​​macroscopic finite element simulation, the optimal content of composite particle reinforcement is determined by calculating the composite particle reinforcement with different contents through a two-dimensional finite element model. Based on the two-dimensional finite element model, composite fiber reinforcement is added to obtain a three-dimensional equivalent matrix model, and the strength of the three-dimensional equivalent matrix model is calculated. Based on the three-dimensional equivalent matrix model, after laying long fibers at different angles and performing finite element simulation calculations, the optimal long fiber laying angle was obtained. The method includes: drawing a three-dimensional equivalent matrix model containing the optimal content of composite particle reinforcement and the optimal content of composite fiber reinforcement based on the two-dimensional finite element model; and obtaining the tensile strength, tensile modulus, and shear modulus of the equivalent tubing matrix combining composite particle reinforcement and composite fiber reinforcement based on finite element simulation calculations. The method includes: drawing a corresponding equivalent matrix tubing model based on the three-dimensional equivalent matrix model; laying a preset layer of long fibers at different angles on the surface of the equivalent matrix tubing model; calculating the stress-strain curves of the long fibers laid at different angles based on finite element simulation calculations, and obtaining the optimal solution by comparing the results.

2. The design method for multi-scale composite material tubing as described in claim 1, characterized in that, Considering the adhesion and coefficient of thermal expansion between the composite matrix, composite particle reinforcement, and composite fiber reinforcement, it is necessary to ensure that the composite matrix, composite particle reinforcement, and composite fiber reinforcement have good adhesion and similar coefficients of thermal expansion, so that they can expand synchronously when heated, reducing the possibility of stress cracking.

3. The design method for multi-scale composite material tubing as described in claim 1, characterized in that, Through learning and screening of material databases, bismaleimide resin was selected as the matrix of the composite material, silicon carbide particles as the particle reinforcement, and carbon fiber as the fiber reinforcement.

4. The design method for multi-scale composite material tubing as described in claim 1, characterized in that, Optimal particle content and long fiber layup angle were determined through high-throughput calculations.

5. The design method for multi-scale composite material tubing as described in claim 1, characterized in that, The method includes: Using the concept of materials genome, the content of composite material particle reinforcement was optimized, and two-dimensional finite element models with different particle contents were drawn. Based on finite element simulation calculations, stress-strain curves with different particle contents were compared, and the optimal content of particle reinforcement in the composite material was determined by comparing the changing trends.

6. The design method for multi-scale composite material tubing as described in claim 1, characterized in that, When the content of composite particle reinforcement is 8%, 20% composite fiber reinforcement is added to form an equivalent matrix, and 10 layers of long fibers at different angles [±85 / ±15 / 60 / ±85 / ±15 / -60] are laid, a composite oil pipe that meets the service requirements is obtained.

7. A storage medium, characterized in that, It includes a series of instructions for performing the method steps as described in any one of claims 1-6.

8. A design device for multi-scale composite material tubing, characterized in that, The apparatus for designing multi-scale composite tubing using the method described in any one of claims 1-6 comprises: The selection module is used to select composite matrix, composite particle reinforcement and composite fiber reinforcement through learning and screening of the material database. The composite fiber reinforcement includes short fibers and long fibers. The two-dimensional module is used to calculate the optimal content of composite particle reinforcements based on the basic idea of ​​macroscopic finite element simulation. A three-dimensional module is used to add composite fiber reinforcement to the two-dimensional finite element model to obtain a three-dimensional equivalent matrix model, and to calculate the strength of the three-dimensional equivalent matrix model. The laying module is used to lay long fibers at different angles on the basis of the three-dimensional equivalent matrix model, and then perform finite element simulation calculations to obtain the optimal long fiber laying angle.

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