Modeling simulation method for oil field carbon dioxide flooding injection technological process and related device

Abstract

The invention discloses an oil field carbon dioxide flooding injection technological process modeling simulation method and a related device, and belongs to the technical field of carbon dioxide flooding. Establishing a digital twinborn model according to the related data of the carbon dioxide oil displacement process flow; and injecting a process simulation module into the digital twin model. By establishing a three-dimensional digital model, key links such as a transmission pipeline, a carbon dioxide storage device, a pressurizing device and an injection device are covered, and sensor data fusion is combined, so that the full life cycle process of the carbon dioxide oil displacement injection process can be reproduced in a virtual space. The system can perform offline simulation analysis, and also has the capabilities of online monitoring and prediction implementation, so that powerful support is provided for optimizing the injection process flow of an oil field and realizing real-time monitoring, safety early warning, equipment maintenance and personnel training.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon dioxide oil recovery and relates to a modeling and simulation method for an oilfield carbon dioxide oil recovery injection process and a related device. Background Art

[0002] Carbon capture, utilization and storage, or CCUS (Carbon Capture, Utilization and Storage), refers to a technology that captures, compresses, transports and stores carbon dioxide emitted by large carbon dioxide emission sources, or applies it to industry to prevent it from being emitted into the atmosphere.

[0003] Carbon dioxide flooding is an important means of tertiary oil recovery technology in oil fields. This technology is suitable for conventional oil reservoirs, especially low-permeability and ultra-low-permeability oil reservoirs. It can significantly improve the recovery rate of crude oil and meet the needs of oil field development. In order to effectively reduce the emission of carbon dioxide into the atmosphere, carbon dioxide is injected into the ground as a gas drive and used as a displacement fluid to increase the recovery rate of crude oil. The best injection process is designed to better complete the task of carbon dioxide storage and oil recovery. Optimize the storage process technology, give full play to the advantages of efficient injection equipment, improve the quality of injection, ensure the smooth implementation of the process, and achieve the best storage and oil recovery purpose.

[0004] However, in the existing technology, most oil fields currently use the traditional two-dimensional coordinate method to display the data of various oil production equipment. However, this data display method is not intuitive enough. It is difficult to accurately present the equipment layout and production process operation of the oil field site by only presenting the location and status of the equipment through two-dimensional coordinates. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem in the prior art that it is difficult to accurately present the equipment layout and the operation status of the production process of the oil field station through two-dimensional coordinates, and to provide an oil field carbon dioxide injection process modeling simulation method and related devices.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention discloses a method for modeling and simulating a process flow of carbon dioxide injection for oil field flooding, comprising the following steps:

[0008] Establish a digital twin model based on data related to the CO2 flooding process;

[0009] Inject process simulation modules into the digital twin model.

[0010] In a second aspect, the present invention discloses a modeling and simulation system for an oilfield carbon dioxide flooding injection process, comprising:

[0011] Model building module, used to build a digital twin model based on data related to the CO2 flooding process;

[0012] Process simulation module, used to inject process simulation module into the digital twin model.

[0013] In a third aspect, the present invention discloses 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 the steps of the oil field carbon dioxide injection process modeling and simulation method when executing the computer program.

[0014] In a fourth aspect, the present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the steps of the oilfield carbon dioxide injection process modeling and simulation method are implemented.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention discloses a method for modeling and simulating the process flow of carbon dioxide flooding injection in oil fields and related devices; by establishing a three-dimensional digital model, covering key links such as transmission pipelines, carbon dioxide storage equipment, pressurizing equipment, and injection equipment, combined with sensor data fusion, the present invention can reproduce the entire life cycle of the carbon dioxide flooding injection process in a virtual space. It can not only perform offline simulation analysis, but also have the ability to monitor online and implement predictions, thereby providing strong support for optimizing injection processes in oil fields, achieving real-time monitoring, safety warnings, equipment maintenance, and personnel training. The present invention combines digital twin technology with oil field carbon dioxide flooding technology, and is committed to breaking the limitations of traditional two-dimensional displays, and showing the operating status of oil field station equipment layout and process flow in a more intuitive and comprehensive way. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. 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 related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a flow chart of the method of the present invention;

[0019] Figure 2 is a schematic diagram of the system of the present invention;

[0020] Figure 3 is an overall flow chart of an embodiment of the present invention;

[0021] Figure 4 is a system functional architecture diagram of an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the computer device structure of the present invention. DETAILED DESCRIPTION

[0023] 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0030] See also Figure 1 The embodiment of the present invention discloses a method for modeling and simulating a process flow of carbon dioxide injection into an oil field, comprising the following steps:

[0031] S1, establish a digital twin model based on the relevant data of the CO2 flooding process;

[0032] S2, inject the process simulation module into the digital twin model.

[0033] The relevant data include equipment parameters, process parameters, environmental conditions, etc. These data can come from sensors, historical records, process drawings, etc. Then, based on the collected data, a digital twin model is established, including a three-dimensional model, a physical model, and a mathematical model of each key link. Then a digital twin platform is established to integrate various models and data. This platform will allow users to simulate and monitor the oil field CO2 injection process in real time. The platform can also include a visual interface to enable users to better understand the changes and effects of the process.

[0034] The twin model can be divided into four levels, namely the physical level, the perception level, the twin level and the application level. Figure 4 As shown, the physical layer records data through all measurable carriers and transmits it to the perception layer. The perception layer receives the data for data processing and then outputs the information to the twin layer. The twin layer is driven by data to simulate the operating status of the physical layer, and then visualizes the various simulated and processed data processing situations to the application layer. The application layer explores the data patterns and feeds back to the physical layer, thereby controlling the subsequent operating status.

[0035] Physical layer:

[0036] The physical layer mainly includes production equipment, production environment and personnel in the physical world. Production equipment includes absorption devices, membrane separation equipment, pipelines, valves, compressors, generators, various water tanks, pumps, etc. The production environment includes the injection station and injection wells of the production operation site; personnel refers to all staff related to the injection system.

[0037] Perception layer:

[0038] The perception layer is responsible for collecting and transmitting multi-source, heterogeneous real-time data from the physical layer. Such as various devices such as data acquisition, data storage, and processing. Data acquisition includes various sensors, pressure gauges, and cameras; data storage mostly refers to the system's cloud database; data processing is the process of the system clarifying data for various data streams.

[0039] Twin layer:

[0040] The twin layer is a model construction of various devices in the perception layer and physical layer, and a simulation of all physical entities.

[0041] Application layer:

[0042] The application layer is the control platform of the digital twin CO2 flooding injection system, which is the core research object of this invention, including the statistical visualization icon of CO2 injection volume and the three-dimensional digital twin visualization scene of real-time simulation on site.

[0043] CCUS (Carbon Capture, Utilization and Storage) is a multidisciplinary, multi-dimensional scientific and technological system. Achieving net zero emissions through carbon utilization and storage is a new theory and technology system, especially efficient utilization requires disruptive technology. CCUS specifically refers to the technical means of capturing and separating carbon dioxide from emission sources such as energy utilization and industrial production, storing carbon dioxide through carbon storage methods, and recycling it after purification, ultimately achieving carbon reduction and emission reduction. CCUS technology is mainly divided into three links: carbon dioxide capture, transportation, and storage and utilization, which is a complete technical process flow.

[0044] 1) Carbon capture:

[0045] Carbon capture technologies mainly include pre-combustion capture, post-combustion capture, and oxygen-enriched combustion capture (which can also be regarded as capture during combustion).

[0046] 2) Carbon transport

[0047] Carbon transportation is the middle link of CCUS technology system. The transportation modes include pipeline transportation and vehicle transportation, which are suitable for different scenarios. Pipeline transportation is to lay special pipelines for gas transportation, which has the advantages of large transportation volume and low cost. Road and rail transportation are more flexible and have the advantages of long-distance transportation.

[0048] 3) Carbon storage and utilization

[0049] Carbon sequestration and utilization Carbon dioxide sequestration includes marine sequestration and geological sequestration. The most discussed one at present is geological sequestration, which is to inject the captured gas from the emission source into a suitable geological structure. The main methods are deep saline layer sequestration and abandoned oil and gas field sequestration. Carbon dioxide utilization engineering technology can be divided into geological utilization, chemical utilization and biological utilization. The purpose is to utilize the captured carbon dioxide as a resource and achieve multiple synergistic benefits across industries.

[0050] The original premise of a digital twin is to create a virtual representation of a physical product, where the virtual representation can reflect the entire life cycle of the physical product.

[0051] Digital twins are actually a comprehensive system that integrates multiple disciplines. Its core is to bridge the physical entity with the virtual model. Its characteristics are strong operational interactivity, wide technical scalability, high accuracy, and low interference. It includes many technical elements: 3R technology, data visualization, artificial intelligence, big data, the Internet of Things, cloud computing, holographic imaging, and collaborative computing. In recent years, digital twins have been widely used in power, shipping, smart cities, medical health and other fields.

[0052] At present, oil fields mostly use two-dimensional coordinates to display various oil production equipment on a large visualization screen, but this data display is not intuitive enough. Each device is visualized using two-dimensional coordinate points, which cannot fully describe the operating conditions of each oil field station equipment and production process.

[0053] At present, most oil fields use the traditional two-dimensional coordinate method to display the data of various oil production equipment. However, this data display method is not intuitive enough. It is difficult to accurately present the equipment layout and production process operation of the oil field station by only presenting the location and status of the equipment through two-dimensional coordinates. Therefore, there is an urgent need for a more intuitive method that can display the simulation of the oil field CO2 injection process in a more realistic and comprehensive way.

[0054] The inventors found that in the process of oilfield development, CO2 flooding, as a key technology, is playing a key role in improving oil recovery and reducing greenhouse gas emissions. However, the data display method of oilfield process flow faces some limitations. The traditional two-dimensional coordinate method is difficult to fully present the complexity and overall picture of the CO2 flooding injection process.

[0055] It is in this context that the inventors proposed a digital twin-based oilfield carbon dioxide flooding injection process modeling simulation system and method to solve the above problems. This innovative method combines digital twin technology with oilfield carbon dioxide flooding technology, and is committed to breaking the limitations of traditional two-dimensional display, and presenting the layout of oilfield station equipment and the operation status of the process in a more intuitive and comprehensive way.

[0056] By building a three-dimensional digital model, covering key links such as transmission pipelines, carbon dioxide storage equipment, pressurization equipment, and injection equipment, and combining sensor data fusion, the simulation system can reproduce the entire life cycle of the carbon dioxide flooding injection process in virtual space. This system can not only perform offline simulation analysis, but also has the ability to monitor online and implement predictions, thereby providing strong support for oilfield optimization of injection processes, real-time monitoring, safety warning, equipment maintenance, and personnel training.

[0057] See also Figure 3 In a feasible embodiment of the present invention, the injection process simulation module in the digital twin model includes: the injection process simulation module in the digital twin model performs oil field gas simulation, carbon dioxide gas pressurization simulation, carbon dioxide gas liquefaction simulation, liquid carbon dioxide storage, injection pump injection simulation and injection wellhead simulation respectively.

[0058] In a feasible implementation of the present invention, the carbon dioxide in the oilfield CCUS project mainly comes from industrial emissions and natural gas production. Therefore, it is necessary to establish models of these two carbon capture processes based on the digital twin platform. The oilfield gas simulation specifically includes:

[0059] Carbon capture process modeling:

[0060] Simulates CO2 emissions from industrial processes, including combustion processes, industrial production processes, etc. This model can predict CO2 emissions based on actual data and physical principles.

[0061] Carbon capture technology simulation:

[0062] By building a model to simulate different carbon capture technologies, such as absorption, membrane separation, etc., to determine which technology is most suitable for capturing industrial carbon dioxide emissions. This model can take into account factors such as efficiency and cost under different conditions.

[0063] By simulating the gas production process in the digital twin model, we can simulate the complete process of gas from source to separation and compression. Based on the actual operating parameters, the model can calculate the gas flow, composition and properties produced. Through this step, we can monitor the status of the gas production process in real time and compare it with the expected results in the model, so as to better understand the consistency between actual operation and simulation.

[0064] In a feasible implementation manner of the present invention, the carbon dioxide gas pressurization simulation specifically includes:

[0065] A mathematical model is established based on gas-related data to simulate the entire boosting process. First, real data is collected, including gas properties, pressure, temperature, flow, etc. These data will be used as inputs to the digital twin model. Based on these mathematical models, the operation process of the booster compressor is simulated.

[0066] Verify the model and set different operation scenarios based on actual operation to simulate through the model; use the collected data and physical principles to develop a mathematical model to simulate the entire boosting process. The model should include aspects such as booster compressor, pipeline transportation, and changes in gas pressure and temperature. After the model is developed, it needs to be verified to ensure that it can accurately reflect the actual situation. Based on actual operation, set different operation scenarios, which can include different initial pressure, temperature, flow rate and other conditions, and let the model simulate according to these operation scenarios.

[0067] The working state of the booster compressor and gas-related parameters are obtained through simulation prediction. Use a digital model to simulate, input initial conditions and run the model to simulate the boosting process. The model will predict the working state of the booster compressor, gas pressure, temperature, etc. based on the set parameters and physical laws. The simulation results will include the changes in pressure and temperature at different time points.

[0068] In a feasible embodiment of the present invention, the carbon dioxide gas liquefaction simulation specifically includes:

[0069] Based on the actual device parameters and engineering drawings, a three-dimensional digital model of the carbon dioxide gas liquefaction device is constructed; the model should cover various components of the liquefaction device, such as evaporator, compressor, condenser, throttle valve, etc.

[0070] Data fusion and initial condition setting: Obtain parameters and operating conditions from the actual device and import them into the digital twin model as initial conditions. At the same time, use the data acquisition system to obtain sensor data of the liquefaction device in real time, such as pressure, temperature, flow, etc.

[0071] Simulate the air-cooled liquefaction process: The carbon dioxide gas liquefaction process is simulated in detail in the model. First, the liquid ammonia is simulated to absorb the heat of the carbon dioxide gas in the evaporator and evaporate into ammonia vapor. The heat capacity, heat transfer characteristics of liquid ammonia and the heat exchange process with carbon dioxide gas are considered.

[0072] Simulate the compression process of ammonia: simulate the process of ammonia vapor being pumped from the compressor to the condenser. During the compression process, the model needs to consider the changes in temperature, pressure and volume of ammonia vapor. The model should also consider the effect of the thermal equivalent of the motor on the ammonia vapor to simulate the actual heat exchange situation.

[0073] Condensation process simulation: In the model, the process of ammonia vapor losing heat in the condenser and condensing into liquid ammonia is simulated. The model needs to consider the temperature and flow rate of cooling water as well as the heat transfer and phase change of ammonia vapor during the condensation process.

[0074] Throttle valve simulation and circulation: Simulate the process of the throttle valve replenishing the condensed liquid ammonia to the evaporator in a controlled manner. This ensures the continuous operation of the evaporator. The model should consider the flow characteristics of liquid ammonia, the throttling effect, and the stability of the circulation process.

[0075] Temperature and efficiency analysis: During the simulation, the temperature, pressure and flow rate changes of liquid ammonia and carbon dioxide gas are recorded in each key step. By analyzing the simulation results, the performance, energy efficiency and effects of the liquid device under different operations are evaluated.

[0076] Fault simulation and response: Fault simulation is introduced to simulate possible equipment failures or abnormal conditions to evaluate their impact on the liquefaction process.

[0077] Through these steps, the entire process of carbon dioxide gas liquefaction can be gradually simulated in the digital twin model. Such simulation helps to better understand the operating mechanism of the liquefaction unit, optimize operating parameters, and provide smarter decision support for actual operation.

[0078] In a feasible embodiment of the present invention, the liquid carbon dioxide storage simulation specifically includes:

[0079] Based on the actual parameters of the tank and engineering drawings, a 3D digital model of the tank is created; the model includes components such as inner and outer containers, insulation layers, and interlayer filling materials.

[0080] Design materials and structures: In the model, the inner and outer container materials, insulation materials, etc. of the storage tank are set according to the actual situation. The thermal conductivity, strength and other parameters of the outer container material of 16MnDR are considered. Pearlescent sand is selected for the interlayer insulation material, and vacuum extraction is set to ensure the insulation performance.

[0081] Simulate the storage process of liquid carbon dioxide: simulate the process of receiving and storing liquid carbon dioxide in a storage tank. Consider factors such as tank capacity, pressure change, and temperature change. The model involves the liquid phase characteristics and behaviors of liquid carbon dioxide, such as density and volume change.

[0082] Insulation performance analysis: During the simulation process, the performance of the insulation material is recorded, including the thermal conductivity, heat capacity, thickness and other parameters of the insulation layer. The effect of the insulation material in the operation of the tank is simulated to ensure the heat retention performance of the storage process.

[0083] Installation and configuration simulation: In the model, simulate the installation configuration of two liquid carbon dioxide storage tanks. Consider the distance, relative position and safety spacing between the tanks. Simulate the configuration of two tanks with one in operation and one in standby to ensure the reliability of the system.

[0084] Temperature and pressure change analysis: During the simulation, record the temperature and pressure changes during the storage of liquid carbon dioxide. Simulate the pressure and temperature distribution of liquid carbon dioxide under different working conditions.

[0085] Safety and environmental impact analysis: During the simulation, the safety performance of the storage tank is evaluated to ensure its stability under different conditions. At the same time, the impact of liquid carbon dioxide storage on the environment, such as liquid carbon dioxide emissions, greenhouse gases, etc., is simulated.

[0086] Through these steps, the entire process of liquid CO2 storage can be simulated in the digital twin model to better understand the performance, operation and safety characteristics of the tank. This simulation helps optimize the storage process, reduce risks, and provide smarter decision support for actual operation.

[0087] In a feasible implementation of the present invention, a digital twin is used to simulate the carbon dioxide injection process, covering the working principle, pressure regulation, flow control and other aspects of the injection pump. The injection pump injection simulation specifically includes:

[0088] Create a three-dimensional digital model of the injection pump based on the parameters of the actual injection pump; the model should include components such as the injection pump, hydraulic system, and pipelines.

[0089] Plunger pump working principle simulation: In the model, the working principle of the three-piston pump is simulated in detail. The reciprocating motion of the plunger in the cylinder is simulated, and the volume change of the sealed working chamber is simulated. Factors such as the plunger's geometry, hydraulic pressure, and friction are considered.

[0090] Injection parameter setting: Set the inlet pressure and discharge pressure range of the injection pump. According to the actual operating conditions, set the inlet pressure between 1.5MPa-2.0MPa and the discharge pressure between 18MPa-20MPa.

[0091] Simulate the injection process: Simulate the CO2 injection process in the model. Simulate the entire process of the injection pump sucking in liquid, compressing the liquid and injecting it into the wellhead. The model needs to consider the fluidity, pressure changes and flow control of the liquid.

[0092] Pressure regulation and flow control: Simulate the functions of pressure regulators and flow control devices. Consider how to adjust the flow and pressure by controlling the operating frequency and volume change of the plunger pump.

[0093] Installation and configuration simulation: In the model, simulate the installation positions of the three plunger pumps. Set the relative positions of the plunger pumps, pipeline connections, and control system layout according to actual conditions.

[0094] Injection efficiency and quality analysis: During the simulation, the flow rate, pressure and temperature changes of the liquid during the injection process are recorded. By analyzing the simulation results, the efficiency of the injection process and the quality of the injected liquid are evaluated.

[0095] Through these steps, the entire process of injection pump injection can be simulated in the digital twin model, thereby better understanding the working characteristics, process control and system performance of the injection pump.

[0096] In a feasible implementation of the present invention, a digital twin is used to simulate the injection wellhead process, covering the considerations of wellhead equipment, pipeline configuration, switching of different injection methods, etc. The injection wellhead simulation specifically includes:

[0097] Create a three-dimensional digital model of the injection wellhead based on the actual wellhead parameters; the model should include components such as wellhead equipment, injection pipelines, and handover devices.

[0098] Wellhead equipment simulation: In the model, the interface and working principle of the 250-type high-pressure wellhead are simulated in detail, and the composition of the wellhead equipment is simulated, including the water injection pipeline, carbon dioxide injection pipeline, etc.

[0099] Injection pipeline configuration: simulate the configuration of two injection pipelines at the wellhead, one water injection pipeline, and one carbon dioxide pipeline, taking into account the layout, connection method, valve configuration, etc. of the pipelines.

[0100] Injection mode switching simulation: simulate the switching of different injection modes in the model, realize the alternating injection of water and gas, and simulate the opening and closing of injection valves, pipeline switching and other processes.

[0101] Injection efficiency and quality analysis: During the simulation, the flow rate, pressure and temperature changes of the liquid during the injection process are recorded. By analyzing the simulation results, the efficiency of the injection process and the quality of the injected liquid are evaluated.

[0102] Switching efficiency and safety analysis: Analyze the switching efficiency and safety of different injection methods. Consider factors such as pressure fluctuations and pipeline impact during the switching process to evaluate the switching stability.

[0103] Fault simulation and response: During the simulation process, the safety performance of the wellhead equipment is evaluated. At the same time, the impact of the injection process on the underground reservoir and environment, such as the distribution and temperature of the injected liquid, is simulated.

[0104] Through these steps, the entire process of injection into the wellhead can be simulated in the digital twin model to understand the operating characteristics, pipeline configuration, and switching methods of the wellhead equipment.

[0105] See also Figure 2 The embodiment of the present invention discloses a modeling and simulation system for an oilfield carbon dioxide flooding injection process, comprising:

[0106] Model building module, used to build a digital twin model based on data related to the CO2 flooding process;

[0107] Process simulation module, used to inject process simulation module into the digital twin model.

[0108] An embodiment of the present invention discloses 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 the steps of the oilfield carbon dioxide flooding injection process modeling and simulation method when executing the computer program.

[0109] See also Figure 5 An embodiment of the present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and is characterized in that when the computer program is executed by a processor, the steps of the oil field carbon dioxide injection process modeling and simulation method are implemented.

[0110] The modeling method provided by the implementation example of the present invention includes data acquisition and modeling, building a digital twin platform, and simulating the gas supply to the oil production plant, carbon dioxide gas pressurization, gas liquefaction, liquid carbon dioxide storage, injection pump injection and injection wellhead. Based on the digital twin, real-time data is integrated with the precise model to achieve offline simulation, online monitoring and real-time prediction, improve production efficiency, safety and environmental friendliness, and provide powerful tools and support for the carbon dioxide flooding process.

[0111] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. 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 produce 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.

[0113] 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 including 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.

[0114] 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 A step that specifies a function in one or more boxes.

[0115] 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for modeling and simulating a process flow of carbon dioxide injection for oil field flooding, characterized in that: The following steps are involved: Establish a digital twin model based on data related to the CO2 flooding process; Inject process simulation modules into the digital twin model.

2. The method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 1, characterized in that: The injection process simulation module in the digital twin model includes: the injection process simulation module in the digital twin model respectively performs oil production plant gas simulation, carbon dioxide gas pressurization simulation, carbon dioxide gas liquefaction simulation, liquid carbon dioxide storage, injection pump injection simulation and injection wellhead simulation.

3. A method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 2, characterized in that: The oil production plant gas simulation specifically includes: simulating the emission of carbon dioxide in industrial processes, including combustion processes and industrial production processes; and simulating different carbon capture technologies by establishing models.

4. The method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 2, characterized in that: The carbon dioxide gas pressurization simulation specifically includes: A mathematical model is established based on gas-related data to simulate the entire pressurization process; Verify the model and set different operation scenarios based on actual operations to simulate them through the model; The working status of the booster compressor and gas-related parameters are obtained through simulation and prediction.

5. The method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 2, characterized in that: The carbon dioxide gas liquefaction simulation specifically includes: Construct a 3D digital model of the CO2 gas liquefaction plant based on actual plant parameters and engineering drawings; In the three-dimensional digital model of the carbon dioxide gas liquefaction device, the process of absorbing heat from carbon dioxide gas in the evaporator and evaporating into ammonia vapor is simulated. The ammonia vapor is pumped to the condenser by the compressor. The ammonia vapor loses heat in the condenser and condenses into liquid ammonia. The throttle valve then supplies the condensed liquid ammonia to the evaporator in a controlled manner. During the simulation process, the temperature, pressure and flow rate changes of liquid ammonia and carbon dioxide gas in each step are recorded; by analyzing the simulation results, the performance of the liquid device and the effects under different operations are evaluated; Simulate equipment failures or abnormal conditions to assess the impact on the liquefaction process.

6. The method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 2, characterized in that: The liquid carbon dioxide storage simulation specifically includes: Create a 3D digital model of the tank based on the tank's actual parameters and engineering drawings; In the three-dimensional digital model of the storage tank, the inner and outer container materials and insulation materials of the storage tank are set according to the actual situation, and vacuum extraction is set to ensure the insulation performance; Simulate the process of receiving and storing liquid carbon dioxide in a tank and record the performance of the insulation material; Simulate the installation configuration of two liquid carbon dioxide storage tanks, taking into account the distance, relative position and safety spacing between the tanks; record the temperature and pressure changes during the storage of liquid carbon dioxide; simulate the pressure and temperature distribution of liquid carbon dioxide under different working conditions; During the simulation, the safety performance of the storage tank is evaluated to ensure its stability under different conditions; at the same time, the impact of the storage of liquid carbon dioxide on the environment is simulated.

7. The method for modeling and simulating an oilfield carbon dioxide flooding injection process according to claim 2, characterized in that: The injection pump injection simulation specifically includes: Creating a three-dimensional digital model of the injection pump based on the parameters of the actual injection pump; The working principle of the three-piston pump is simulated in the three-dimensional digital model of the pump, and the inlet pressure and discharge pressure range of the injection pump are set; Simulate the CO2 injection process, the role of the pressure regulator and flow control device, and the installation positions of the three plunger pumps; During the simulation, the flow rate, pressure and temperature changes of the liquid during the injection process are recorded; by analyzing the simulation results, the efficiency of the injection process and the quality of the injected liquid are evaluated; The injection wellhead simulation specifically includes: Create a 3D digital model of the injection wellhead based on actual wellhead parameters; The interface and working principle of the 250-type high-pressure wellhead, injection pipeline configuration, and injection mode switching are simulated in the 3D digital model of the injection wellhead; During the simulation, the flow rate, pressure and temperature changes of the liquid during the injection process are recorded; by analyzing the simulation results, the efficiency of the injection process and the quality of the injected liquid are evaluated; Analyze the switching efficiency and safety of different injection methods; consider the pressure fluctuation and pipeline impact during the switching process, and evaluate the switching stability; During the simulation, the safety performance of the wellhead equipment is evaluated; and the impact of the injection process on the underground reservoir and environment is simulated.

8. A modeling and simulation system for oilfield carbon dioxide flooding injection process, characterized in that: include: Model building module, used to build a digital twin model based on data related to the CO2 flooding process; Process simulation module, used to inject process simulation module into the digital twin model.

9. 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 method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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