Standardized center platform jacket structure design method and device, medium and equipment

Abstract

The invention relates to a standardized center platform jacket structure design method and device, a medium and equipment. The method comprises the steps that ultra-high-strength steel with the yield strength not lower than a certain value is selected as steel of a jacket structure; in the design of the offshore platform jacket structure, steel with proper pipe diameter and wall thickness is selected; structural analysis: simulating stress distribution and deformation conditions of the jacket structure under the action of various environmental factors including waves, wind loads and ocean currents by using finite element analysis software, and ensuring that the design meets the expected service life and safety performance; carrying out towing, hoisting and docking analysis on the jacket structure to ensure that the mounting scheme of the jacket structure is reasonable and reliable; and layout optimization: optimizing the layout of the jacket structure based on the results of the unified design, the structure analysis and the installation analysis to realize the optimization of material distribution, and gradually improving the structural layout through an iterative design process to achieve a predetermined performance optimal target.

Description

Technical Field

[0001] The invention relates to a standardized central platform jacket structure design method, device, medium and equipment, belonging to the technical field of offshore oil engineering. Background Art

[0002] As offshore oil and gas exploration and development activities continue to expand, the functions and scale of the platform have increased accordingly. However, the installation of the jacket is limited by the choice of offshore construction resources, especially for the Bohai Sea area, which is the first choice for jacket installation. The 3,000-ton lifting capacity of the commonly used floating crane has become a key bottleneck restricting the design and installation of the Bohai jacket. After in-depth research, it was found that the eight-leg jacket with two-wing wellheads built according to traditional steel materials and design methods weighs 3,500 tons, which exceeds the lifting capacity of the commonly used floating crane. The use of a 7,000-ton floating crane for construction is expected to increase economic investment by 20 million. Therefore, exploring how to reduce the weight of the jacket through material innovation and design optimization to adapt to the lifting capacity of the floating crane has become a key technical problem in promoting the development of Bohai oil and gas fields to a deeper level. Summary of the invention

[0003] In view of the above technical problems, the present invention provides a standardized central platform jacket structure design method, which uses high-strength steel round tubes with excellent bending resistance and lighter weight, so as to realize lightweight design of the jacket and reduce the overall investment of the offshore platform.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A standardized central platform jacket structure design method, comprising: Material selection: Select ultra-high strength steel with a yield strength not less than a certain value as the steel for the jacket structure; Unified design: In the design of the offshore platform jacket structure, the pipe diameter and wall thickness are diversified, so choose the steel with the appropriate pipe diameter and wall thickness; Structural analysis: Finite element analysis software is used to simulate the stress distribution and deformation of the jacket structure under various environmental factors including waves, wind loads, and ocean currents, and to conduct structural analysis to ensure that the design meets the expected service life and safety performance; Installation analysis: Towing, hoisting and docking analysis of the jacket structure to ensure that the installation plan of the jacket structure is reasonable and reliable; Optimize layout: Based on the results of unified design, structural analysis and installation analysis, optimize the layout of the jacket structure to achieve the optimal material distribution. Through the iterative design process, gradually improve the structural layout to achieve the predetermined optimal performance goal.

[0005] In the standardized central platform jacket structure design method, preferably, the yield strength of the ultra-high strength steel is not less than 420 MPa.

[0006] In the standardized central platform jacket structure design method, preferably, the chemical composition of the ultra-high strength steel is calculated by weight percentage as follows: C 0.10-0.20%, Si 0.20-0.40%, Mn 1.20-1.60%, V 0.03-0.10%, N 0.005-0.05%, P≤0.01%, S≤0.01%, V / N>4; the remainder is Fe and unavoidable impurities.

[0007] In the standardized central platform jacket structure design method, preferably, the diameter of the ultra-high strength steel is 406mm-2674mm, and the wall thickness is 13mm-80mm.

[0008] The standardized central platform jacket structure design method preferably utilizes topology optimization and morphology optimization techniques during the layout optimization process to achieve optimization of material distribution.

[0009] A second aspect of the present invention provides a standardized central platform jacket structure design device, comprising: The first processing unit is used to select ultra-high strength steel with a yield strength not less than a certain value as the steel for the jacket structure; The second processing unit is used to select steel materials with appropriate pipe diameter and wall thickness in the design of the offshore platform jacket structure with diversified specifications of pipe diameter and wall thickness; The third processing unit is used to simulate the stress distribution and deformation of the jacket structure under various environmental factors including waves, wind loads, and ocean currents using finite element analysis software, and to conduct structural analysis to ensure that the design meets the expected service life and safety performance; The fourth processing unit is used to analyze the towing, hoisting and docking of the jacket structure to ensure that the installation plan of the jacket structure is reasonable and reliable; The fifth processing unit is used to optimize the layout of the conductor frame structure based on the results of the unified design, structural analysis and installation analysis to achieve the optimization of material distribution. Through the iterative design process, the structural layout is gradually improved to achieve the predetermined optimal performance target.

[0010] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned standardized central platform jacket structure design methods.

[0011] A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the steps of the standardized central platform jacket structure design method described above when executing the computer program.

[0012] The present invention adopts the above technical solution, which has the following advantages: The standardized ultra-high-strength steel jacket structure and its design method proposed in the present invention successfully realize the lightweight design of the jacket structure through careful material selection, standardized design, precise structural analysis and meticulous layout optimization. The weight of the Bohai jacket structure can be saved by 500 tons, and the comprehensive investment can be saved by more than 30 million. This innovative solution provides a new solution path for the development of the Bohai oilfield. The implementation of this solution brings more economical and efficient technical support for the development of the Bohai oil and gas field. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional view of a schematic diagram of the main legs and horizontal layers of a conductor frame provided in an embodiment of the present invention, wherein the main legs include 4 legs, the auxiliary legs include 4 legs, there are X-shaped supports in the vertical facades of the auxiliary legs, and horizontal rod supports are distributed along the height direction. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work are within the scope of protection of the present invention.

[0015] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0016] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0017] As offshore oil and gas exploration and development activities continue to expand, the functions and scale of the platform have increased accordingly. However, the installation of the jacket is limited by the choice of offshore construction resources, especially for the Bohai Sea area, which is the first choice for jacket installation. The 3,000-ton lifting capacity of the commonly used floating crane has become a key bottleneck restricting the design and installation of the Bohai jacket. After in-depth research, it was found that the eight-leg jacket with two-wing wellheads built according to traditional steel materials and design methods weighs 3,500 tons, which exceeds the lifting capacity of the commonly used floating crane. The use of a 7,000-ton floating crane for construction is expected to increase economic investment by 20 million. Therefore, exploring how to reduce the weight of the jacket through material innovation and design optimization to adapt to the lifting capacity of the floating crane has become a key technical problem in promoting the development of Bohai oil and gas fields to a deeper level.

[0018] Based on the above technical problems, the present invention provides a standardized central platform jacket structure design method, which successfully realizes the lightweight design of the jacket structure through careful material selection, standardized design, precise structural analysis and meticulous layout optimization.

[0019] like Figure 1 As shown, the standardized central platform jacket structure design method provided by the present invention includes the following specific steps: 1. Material selection: In the ultra-high-strength steel pipe frame of the present invention, part of the steel is ultra-high-strength steel with a yield strength of 420Mpa; 2. Unified design principle: Ultra-high strength steel weight reduction design method and principle: Taking a 22m water depth conductor frame in Bohai as an example, the bending strength of round tube steel can be calculated by the formula M=Wx*Fy / ym, where Wx is the bending modulus of the steel, Fy is the yield strength of the steel, ym is the safety factor, and ym is generally a constant. It can be obtained that the comprehensive bending capacity of round tube steel is directly related to the product of the yield strength Fy and the bending modulus Wx of its material. The bending modulus Wx of round tube steel is related to the moment of inertia Ix of the x-axis, and its calculation formula is Ix , D is the diameter of the round tube, and d is the wall thickness of the round tube. When planning the general type of ultra-high strength steel round tubes, the following principles are followed: for DH36 material (yield strength of 355MPa) round tubes with a wall thickness of 60mm or more, the present invention recommends replacing them with DH420 material (yield strength of 420MPa) with a higher yield strength.

[0020] During the optimization process, the initial step is to reduce the wall thickness: for round tubes with a diameter greater than 508mm, the optimized wall thickness is reduced by 1 / 6 to 1 / 7 of the original wall thickness. Through this design method, the steel can achieve material economy and structural lightweight while maintaining the structural bending resistance. The method of the present invention takes the commonly used circular tubular steel in the main leg of the Bohai conductor frame as an example. The general planning effect is as follows: the wall thickness is optimized from 80mm to 68mm. While achieving the same bending strength effect, the ultra-high strength circular steel with a general design provided by the method of the present invention can reduce the weight by 15% compared to the traditional circular steel. For the Bohai conductor frame, the present invention selects the main legs, horizontal layers and X-braces for high-strength steel weight reduction and other strong replacements.

[0021] Table 1 Comparison of parameters between Q355 high-strength tubular legs and Q420 ultra-high-strength tubular legs

[0022] 3. Structural analysis: Use finite element analysis (FEA) software to simulate the stress distribution and deformation of the jacket structure under the influence of environmental factors such as waves, wind loads, and ocean currents, and conduct structural analysis to ensure that the design meets the expected service life and safety performance. If there are rods that do not meet the requirements, they will be strengthened and adjusted.

[0023] 4. Installation analysis: Towing, hoisting and docking analysis of the jacket to ensure that the jacket installation plan is reasonable and reliable.

[0024] 5. Optimize layout: Based on the results of unified design, structural analysis and installation analysis, the layout of the jacket structure is optimized. Topology optimization and morphology optimization techniques are used to optimize material distribution. Through an iterative design process, the structural layout is gradually improved to achieve the predetermined optimal performance goal.

[0025] A second aspect of the present invention provides a standardized central platform jacket structure design device, comprising: The first processing unit is used to select ultra-high strength steel with a yield strength not less than a certain value as the steel for the jacket structure; The second processing unit is used to select steel materials with appropriate pipe diameter and wall thickness in the design of the offshore platform jacket structure with diversified specifications of pipe diameter and wall thickness; The third processing unit is used to simulate the stress distribution and deformation of the jacket structure under various environmental factors including waves, wind loads, and ocean currents using finite element analysis software, and to conduct structural analysis to ensure that the design meets the expected service life and safety performance; The fourth processing unit is used to analyze the towing, hoisting and docking of the jacket structure to ensure that the installation plan of the jacket structure is reasonable and reliable; The fifth processing unit is used to optimize the layout of the conductor frame structure based on the results of the unified design, structural analysis and installation analysis to achieve the optimization of material distribution. Through the iterative design process, the structural layout is gradually improved to achieve the predetermined optimal performance target.

[0026] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any one of the above-mentioned standardized central platform jacket structure design methods.

[0027] A fourth aspect of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the steps of the standardized central platform jacket structure design method described above when executing the computer program.

[0028] The present invention is described by flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to specific embodiments. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0029] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0030] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A standardized central platform jacket structure design method, characterized in that: include: Select ultra-high strength steel with a yield strength not less than a certain value as the steel for the jacket structure; In the design of offshore platform jacket structures, the pipe diameter and wall thickness are diversified, and steel with appropriate pipe diameter and wall thickness is selected; Finite element analysis software is used to simulate the stress distribution and deformation of the jacket structure under various environmental factors including waves, wind loads, and ocean currents, and to conduct structural analysis to ensure that the design meets the expected service life and safety performance; Conduct towing, hoisting and docking analysis on the jacket structure to ensure that the installation plan of the jacket structure is reasonable and reliable; Based on the results of unified design, structural analysis and installation analysis, the layout of the jacket structure is optimized to achieve the optimal material distribution. Through the iterative design process, the structural layout is gradually improved to achieve the predetermined optimal performance goal.

2. The standardized central platform jacket structure design method according to claim 1 is characterized in that: The yield strength of ultra-high strength steel is not less than 420MPa.

3. The standardized central platform jacket structure design method according to claim 1 is characterized in that: The chemical composition of the ultra-high strength steel is calculated by weight percentage as follows: C 0.10-0.20%, Si 0.20-0.40%, Mn 1.20-1.60%, V 0.03-0.10%, N 0.005-0.05%, P≤0.01%, S≤0.01%, V / N>4; the balance is Fe and unavoidable impurities.

4. The standardized central platform jacket structure design method according to claim 1 is characterized in that: The pipe diameter of ultra-high strength steel is 406mm-2674mm, and the wall thickness is 13mm-80mm.

5. The standardized central platform jacket structure design method according to claim 1 is characterized in that: During the layout optimization process, topology optimization and morphology optimization techniques are used to achieve optimal material distribution.

6. A standardized central platform jacket structure design device, characterized in that: include: The first processing unit is used to select ultra-high strength steel with a yield strength not less than a certain value as the steel for the jacket structure; The second processing unit is used to select steel materials with appropriate pipe diameter and wall thickness in the design of the offshore platform jacket structure with diversified specifications of pipe diameter and wall thickness; The third processing unit is used to simulate the stress distribution and deformation of the jacket structure under various environmental factors including waves, wind loads, and ocean currents using finite element analysis software, and to conduct structural analysis to ensure that the design meets the expected service life and safety performance; The fourth processing unit is used to analyze the towing, hoisting and docking of the jacket structure to ensure that the installation plan of the jacket structure is reasonable and reliable; The fifth processing unit is used to optimize the layout of the conductor frame structure based on the results of the unified design, structural analysis and installation analysis to achieve the optimization of material distribution. Through the iterative design process, the structural layout is gradually improved to achieve the predetermined optimal performance target.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the standardized central platform jacket structure design method according to any one of claims 1 to 5 are implemented.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the standardized central platform jacket structure design method according to any one of claims 1 to 5 are implemented.

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