Downhole gas-liquid multistage separation result prediction method and system based on numerical simulation

Abstract

The invention provides an underground gas-liquid multistage separation result prediction method and system based on numerical simulation, and the method comprises the steps: building a Venturi tube model according to the preset size of each part of a Venturi tube; constructing a rotary separator model according to preset internal parameters of the rotary separator; combining the Venturi tube model and the rotary separator model to build a three-dimensional geometric model for gas-liquid multi-stage separation; setting general parameters, materials, a multiphase flow model and boundary conditions of the three-dimensional geometric model, and performing numerical simulation to obtain a simulation result; and extracting and analyzing the simulation result to obtain a separation prediction result. By means of the method, high-precision simulation of the underground gas-liquid multi-stage separation process is achieved, and the underground gas-liquid separation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and in particular to a method and system for predicting downhole gas-liquid multi-stage separation results based on numerical simulation. Background Art

[0002] Separating gas-liquid mixtures is a critical step in oil and gas production. Downhole multi-stage separation technology offers significant advantages, enabling initial gas-liquid separation within the wellbore, reducing the burden on surface processing equipment and improving production efficiency. However, due to the complex downhole environment, gas-liquid separation results vary significantly under different geological conditions and production conditions.

[0003] At present, there is a lack of an effective simulation method and system to accurately predict and optimize the downhole gas-liquid multi-stage separation process, which makes it difficult to achieve precise design and efficient operation of downhole multi-stage separation equipment, limiting the widespread application and further development of downhole multi-stage separation technology. Summary of the Invention

[0004] In view of this, the present invention provides a method and system for predicting downhole gas-liquid multi-stage separation results based on numerical simulation to solve the above problems.

[0005] The present invention provides a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation, comprising: constructing a Venturi tube model according to preset dimensions of various parts of the Venturi tube; constructing a rotary separator model according to preset internal parameters of the rotary separator; building a three-dimensional geometric model for gas-liquid multi-stage separation by combining the Venturi tube model and the rotary separator model; setting universal parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, performing numerical simulation and obtaining simulation results; and extracting and analyzing the simulation results to obtain separation prediction results.

[0006] In another implementation of the present invention, the preset dimensions of various parts of the venturi tube include the throat diameter, the angles of the contraction section and the diffusion section.

[0007] In another implementation of the present invention, the left side of the Venturi tube model is a gas-liquid two-phase flow inlet, and the right side is divided into a waste liquid outlet and an enrichment outlet.

[0008] In another implementation of the present invention, the preset internal parameters of the rotary separator include the shape, number and pitch of the spiral blades.

[0009] In another implementation of the present invention, it also includes: generating a surface mesh according to the preset dimensions of each part of the venturi tube and the preset internal parameters of the rotating separator; generating a volume mesh of the venturi tube model and the rotating separator model by updating the boundary conditions of the surface mesh, creating a regional description geometry, setting the updated region type and adding a boundary layer.

[0010] In another implementation of the present invention, the separation prediction result includes a dynamic gas volume fraction change curve and a volume fraction distribution cloud diagram of the multi-stage separation structure.

[0011] Another aspect of the present invention provides a downhole gas-liquid multi-stage separation result prediction system based on numerical simulation, including: a geometric modeling module: used to construct a Venturi tube model according to the preset dimensions of each part of the Venturi tube; construct a rotary separator model according to the preset internal parameters of the rotary separator; combine the Venturi tube model and the rotary separator model to build a three-dimensional geometric model for gas-liquid multi-stage separation; a numerical simulation module: used to set the general parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, perform numerical simulation, and obtain simulation results; a result output module: used to extract and analyze the simulation results to obtain separation prediction results.

[0012] In another implementation of the present invention, it also includes: a grid generation module: used to generate a surface grid according to the preset dimensions of each part of the venturi tube and the preset internal parameters of the rotating separator; by updating the boundary conditions of the surface grid, creating a regional description geometry, setting the updated region type and adding a boundary layer, the volume grid of the venturi tube model and the rotating separator model is generated.

[0013] Another aspect of the present invention provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the processor implements the steps of a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation as described in any one of the above items.

[0014] Another aspect of the present invention provides a computer storage medium, characterized in that a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, the steps in the method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation as described in any one of the above items are implemented.

[0015] The numerical simulation-based downhole gas-liquid multi-stage separation result prediction method of the present invention realizes high-precision simulation of the downhole gas-liquid multi-stage separation process by innovatively combining the Venturi tube and rotary separator models, solving the problems of low downhole gas-liquid separation efficiency and imperfect simulation technology in the existing technology, providing strong support for in-depth research on the gas-liquid separation mechanism, optimizing the design of separation equipment and improving mining efficiency, thereby promoting technological progress in the oil and natural gas mining industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. By reading the detailed description of the embodiments below, the advantages and benefits of the solutions will become clear to those skilled in the art. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. In the drawings:

[0017] Figure 1 The figure is a flow chart of a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation according to an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the geometric model of a Venturi tube according to an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the geometric model of a rotating separator according to an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of a complete multi-stage separation model according to an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the Venturi tube surface grid according to an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the venturi tube body grid according to an embodiment of the present invention.

[0023] Figure 7 This is a venturi gas volume distribution cloud diagram of an embodiment of the present invention.

[0024] Figure 8 This is a graph showing the change of CH4 volume fraction at the enrichment outlet over time according to an embodiment of the present invention.

[0025] Figure 9 This is a graph showing the change of CH4 volume fraction over time at the waste liquid outlet according to one embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the surface grid of a rotating separator according to an embodiment of the present invention.

[0027] Figure 11 Schematic diagram of the grid of a rotating separator body according to an embodiment of the present invention.

[0028] Figure 12 This is a gas volume distribution cloud diagram of a rotary separator according to an embodiment of the present invention.

[0029] Figure 13 This is a diagram showing the gas ratios at the enrichment outlet and waste liquid outlet of a rotary separator according to an embodiment of the present invention.

[0030] Figure 14 Schematic diagram of the iterative process of a rotary separator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and detailedly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in the embodiments of the present invention should fall within the scope of protection of the embodiments of the present invention.

[0032] Figure 1 A flow chart of a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation is provided in an embodiment of the present invention, as shown in FIG. Figure 1 As shown, this embodiment mainly includes:

[0033] S101. Construct a Venturi tube model according to preset dimensions of each part of the Venturi tube.

[0034] S102: Construct a rotating separator model according to preset internal parameters of the rotating separator.

[0035] S103. Combining the Venturi tube model and the rotary separator model, a three-dimensional geometric model for gas-liquid multi-stage separation is constructed.

[0036] S104: setting general parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, performing numerical simulation and obtaining simulation results.

[0037] S105: Extract and analyze the simulation results to obtain separation prediction results.

[0038] The numerical simulation-based downhole gas-liquid multi-stage separation result prediction method of the present invention realizes high-precision simulation of the downhole gas-liquid multi-stage separation process by innovatively combining the Venturi tube and rotary separator models, solving the problems of low downhole gas-liquid separation efficiency and imperfect simulation technology in the existing technology, providing strong support for in-depth research on the gas-liquid separation mechanism, optimizing the design of separation equipment and improving mining efficiency, thereby promoting technological progress in the oil and natural gas mining industry.

[0039] In another implementation of the present invention, the preset dimensions of various parts of the venturi tube include the throat diameter, the angles of the contraction section and the diffusion section.

[0040] For example, Figure 2 As shown in the figure, during the model design process, the dimensions of each part of the Venturi tube, such as the throat diameter, the angles of the contraction section and the diffusion section, are optimized to improve the gas-liquid separation effect.

[0041] In another implementation of the present invention, the left side of the Venturi tube model is a gas-liquid two-phase flow inlet, and the right side is divided into a waste liquid outlet and an enrichment outlet.

[0042] For example, the Venturi tube is positioned vertically, with the gas-liquid two-phase flow inlet at the bottom. The left side of the Venturi tube model houses the gas-liquid two-phase flow inlet, while the right side houses the waste liquid outlet and the enrichment outlet. The outlet pressures for both are set at 3 MPa. The gas phase is methane, the liquid phase is water, and the gas phase volume fraction is initially set to 10%.

[0043] In another implementation of the present invention, the preset internal parameters of the rotary separator include the shape, number and pitch of the spiral blades.

[0044] For example, Figure 3 As shown in the figure, the rotary separator uses centrifugal force to further separate the gas and liquid. The separation effect can be enhanced by precisely designing the internal structure of the separator, such as the shape, number and pitch of the spiral blades. Figure 4 As shown, the rotating separator model is reasonably connected with the Venturi tube model to construct a complete multi-stage separation model.

[0045] In another implementation of the present invention, it also includes: generating a surface mesh according to the preset dimensions of each part of the venturi tube and the preset internal parameters of the rotating separator; generating a volume mesh of the venturi tube model and the rotating separator model by updating the boundary conditions of the surface mesh, creating a regional description geometry, setting the updated region type and adding a boundary layer.

[0046] For example, consider using SpaceClaim software to build a 3D geometric model of a multi-stage gas-liquid separation structure, including a Venturi tube model and a rotary separator model. The model's inlet, outlet, wall, and separation structure entrance interior are appropriately configured. Ensure that the model's flow path characteristics are consistent with the actual downhole separation device. Ensure that the geometric model is free of overlap and gaps to ensure model accuracy and integrity.

[0047] Specifically, if Figure 5 As shown, after importing the Venturi tube model, add local dimensions to the throat area, select Face Size as the size function, and set the target mesh size to 0.1mm. Then, when generating the surface mesh, change the minimum size of other meshes to 1mm, and keep the default options for the rest. Select the geometry type to be composed of both fluid and solid regions and / or voids, and change the interface type of all fluid-fluid regions from "wall" to "inside". Update the boundary conditions, set the inlet (inlet) to the velocity inlet, the outlet (outlet_1 / 2) to the pressure outlet, and the wall (wall_1 / 2 / 3) to the wall type. After creating the region, update the region type setting by specifying the regional Venturi tube and the gas-liquid separation device as fluid (fluid). When adding the boundary layer, the parameters are set to 3 layers, a transition ratio of 0.272, a growth rate of 1.2, adding fluid regions (fluid-regions), and only growing on the walls (only-walls). As shown Figure 6 As shown in the figure, when generating the volume mesh, the solver is selected as Fluent, the filling type is polyhedra, the global size is controlled, the growth rate is 1.2, and the final mesh is generated.

[0048] like Figure 10 As shown, after importing the rotating separator model, when generating the surface mesh, the minimum size of other meshes is changed to 1mm, and the rest keep the default options. The geometry type selection geometry consists of both fluid and solid regions and / or voids. Update the boundary conditions, set the inlet (inlet) to velocity inlet, the outlet (outlet_1 / 2) to pressure outlet, and the wall (wall_1 / 2 / 3) to wall type. After creating the region, update the region type setting by specifying the regional rotating separator as fluid (fluid), and the regional rotating body and separation device as dead zone (dead). When adding boundary layers, the parameters are set to 3 layers, transition ratio 0.272, growth rate 1.2, adding fluid regions (fluid-regions), and only growing on the walls (only-walls). As shown Figure 11 As shown in the figure, when generating the volume mesh, the solver is selected as Fluent, the filling type is polyhedra, the global size is controlled, the growth rate is 1.2, and the final mesh is generated.

[0049] It should be understood that the multi-stage combination of a Venturi tube and a rotary separator, combined with the synergistic effect of centrifugal force and the Venturi effect, effectively enhances the separation of gas-liquid two-phase flow and improves the purity of the enriched gas. This enables high-precision simulation of the multi-stage gas-liquid separation process downhole, more accurately predicting the gas-liquid separation effect than existing simulation technologies.

[0050] In another implementation of the present invention, general, material, multiphase flow models and boundary conditions are set separately, and then numerical simulation is performed.

[0051] Venturi tube:

[0052] General: Set Solver Type to Pressure Basis, Velocity Format to Absolute, Time to Transient, and Gravity Acceleration to Right to Left.

[0053] Materials: Add methane (CH4) and water-liquid (H2O) to the Fluent database.

[0054] Multiphase flow model: Select the Euler model for the model and the multi-fluid VOF model for the mixture model. Set the discretization format to implicit. For the interphase interaction, set the surface tension model to continuous surface force with a constant of 0.01 N / m.

[0055] Boundary conditions: The water and CH4 velocities at the velocity inlet (inlet) are defined using Magnitude, Normal to Boundary, Absolute reference, a magnitude of 1.415 m / s (inlet flow rate of 1 L / s), and a CH4 volume fraction of 0.1. The gauge pressure at the pressure inlet (outlet_1 / 2) is 3 MPa, the pressure profile is set to 1, the return flow direction is set to Normal to Boundary, the turbulence settings are Intensity and Viscosity Ratio, the return flow turbulence intensity is 5%, and the return end flow viscosity ratio is 10.

[0056] Solving method: Default method.

[0057] After all settings are completed, run the calculation to perform numerical simulation.

[0058] Rotary separator:

[0059] Set the general, material, multiphase flow model and boundary conditions respectively, and then perform numerical simulation.

[0060] General: Set Solver Type to Pressure Basis, Velocity Format to Absolute, Time to Transient, and Gravity Acceleration to Right to Left.

[0061] Materials: Add methane (CH4) and water-liquid (H2O) to the Fluent database.

[0062] Multiphase flow model: Select the Euler model for the model and the multi-fluid VOF model for the mixture model. Set the discretization format to implicit. For the interphase interaction, set the surface tension model to continuous surface force with a constant of 0.01 N / m.

[0063] Boundary conditions: The velocity inlet (inlet) water and CH4 velocities are defined using Magnitude, Normal to Bountiful, Absolute reference, a magnitude of 1.592 m / s (inlet flow rate 1 L / s), and a CH4 volume fraction of 0.1. The pressure inlet (outlet_1 / 2) has a gauge pressure of 3 MPa, a pressure profile of 1, a return flow direction of Normal to Boundary, and turbulence settings of Intensity and Viscosity Ratio, with a return flow turbulence intensity of 5% and a return flow viscosity ratio of 10. Change the boundary conditions for the rotating body to a moving wall, with the rotation axis origin at (0,0,0), the rotation axis direction at x = 1, the velocity at 500 rpm, and the standard roughness model.

[0064] Solution: Change the sub-relaxation factor of pressure to 0.15 in the control.

[0065] After all settings are completed, run the calculation to perform numerical simulation.

[0066] In another implementation of the present invention, the separation prediction result includes a dynamic gas volume fraction change curve and a volume fraction distribution cloud diagram of the multi-stage separation structure.

[0067] For example, through simulation calculation, the curve of the average gas volume fraction at the four outlets of the two-stage diversion and enrichment over time can be obtained, including the following: Figure 7 、 Figure 8 、 Figure 9 The curves of the average gas volume fraction at the enrichment outlet and the waste liquid outlet of the venturi tube as a function of time are shown in FIG. Figure 12 、 13 The curves showing the average gas volume fraction at the enrichment outlet and waste outlet of the rotary separator over time, as well as the gas volume fraction distribution diagram of the multi-stage separation structure, are shown. For example, the simulation results can be extracted and analyzed using the post-processing function of Fluent software.

[0068] The gas volume fraction data at the four outlets was recorded and organized over time, and a curve was plotted to visually demonstrate the dynamic changes in the outlet gas volume fraction. At the same time, a visualization tool was used to generate a gas volume fraction distribution diagram for the multi-stage separation structure, clearly showing the distribution of gas within the entire separation structure and providing detailed data support for studying the gas-liquid separation process.

[0069] It should be understood that by outputting the dynamic gas volume fraction change curve and distribution cloud map of the multi-stage separation structure, researchers can intuitively and deeply understand the flow characteristics and separation process of gas and liquid in the separation equipment. For example, based on the gas volume fraction distribution cloud map, it is possible to accurately locate areas with poor separation effects, such as Figure 14 As shown in the figure, the dimensions of each part of the Venturi tube (such as the throat diameter, the angle of the contraction section and the diffusion section, etc.) and the internal structure of the rotary separator (such as the shape, number and pitch of the spiral blades) are optimized in a targeted manner to improve the separation efficiency and performance of the separation equipment and achieve precise design.

[0070] Another aspect of the present invention provides a downhole gas-liquid multi-stage separation result prediction system based on numerical simulation, comprising:

[0071] Geometric modeling module: used to construct a Venturi tube model based on the preset dimensions of each part of the Venturi tube; construct a rotary separator model based on the preset internal parameters of the rotary separator; and combine the Venturi tube model and the rotary separator model to build a three-dimensional geometric model for multi-stage gas-liquid separation.

[0072] Numerical simulation module: used to set the general parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, perform numerical simulation, and obtain simulation results.

[0073] Result output module: used to extract and analyze the simulation results to obtain separation prediction results.

[0074] The numerical simulation-based downhole gas-liquid multi-stage separation result prediction system of the present invention realizes high-precision simulation of the downhole gas-liquid multi-stage separation process by innovatively combining the Venturi tube and rotary separator models, solving the problems of low downhole gas-liquid separation efficiency and imperfect simulation technology in the existing technology, providing strong support for in-depth research on the gas-liquid separation mechanism, optimizing the design of separation equipment and improving mining efficiency, thereby promoting technological progress in the oil and natural gas mining industry.

[0075] In another implementation of the present invention, it also includes: a grid generation module: used to generate a surface grid according to the preset dimensions of each part of the venturi tube and the preset internal parameters of the rotating separator; by updating the boundary conditions of the surface grid, creating a regional description geometry, setting the updated region type and adding a boundary layer, the volume grid of the venturi tube model and the rotating separator model is generated.

[0076] The simulation method and system of this invention are suitable for gas-liquid separation under complex geological conditions and variable mining conditions, and can be extended to the efficient development of unconventional oil and gas resources such as shale gas and tight gas. They address the shortcomings of existing technologies in downhole multi-stage gas-liquid separation simulation, providing new technical means and research ideas for the oil and gas extraction industry. They will help promote technological innovation and development in related fields, promote the widespread application of downhole multi-stage separation technology, and drive technological progress across the industry.

[0077] In another aspect of the present invention, an electronic device includes a processor, a memory, a communication bus, and a communication interface.

[0078] in:

[0079] The processor, memory and communication interface communicate with each other through a communication bus.

[0080] Communication interface, used to communicate with other electronic devices or servers.

[0081] The processor is used to execute the program, and specifically can execute the steps of any one of the methods for predicting downhole gas-liquid multi-stage separation results based on numerical simulation in the above embodiments.

[0082] Specifically, the program may include program codes including computer operation instructions.

[0083] The processor may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application. The one or more processors included in the smart device may be processors of the same type, such as one or more CPUs; or different types of processors, such as one or more CPUs and one or more ASICs.

[0084] Memory is used to store programs. The memory may include high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk storage.

[0085] The program can be specifically configured to cause a processor to execute the steps of any of the numerical simulation-based downhole gas-liquid multi-stage separation result prediction methods described in the embodiments. The specific implementation of each step in the program can be found in the corresponding descriptions of the steps and units executed in any of the numerical simulation-based downhole gas-liquid multi-stage separation result prediction methods described above, and will not be repeated here. Those skilled in the art will clearly understand that, for ease and brevity of description, the specific operating processes of the devices and modules described above can refer to the corresponding process descriptions in the aforementioned method embodiments.

[0086] The exemplary embodiments of the present application further provide a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to execute the methods of the various embodiments of the present application.

[0087] The method according to the embodiment of the present invention described above can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as a CD ROM, RAM, floppy disk, hard disk or magneto-optical disk), or as computer code that is originally stored in a remote recording medium or a non-temporary machine-readable medium downloaded via a network and will be stored in a local recording medium, so that the method described herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor or programmable or dedicated hardware (such as an ASIC or FPGA). It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code, and when the software or computer code is accessed and executed by a computer, a processor or hardware, the method described herein is implemented. In addition, when a general-purpose computer accesses the code for implementing the method shown here, the execution of the code converts the general-purpose computer into a dedicated computer for executing the method shown here.

[0088] Thus far, specific embodiments of the present invention have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Additionally, the processes depicted in the accompanying drawings do not necessarily require the specific order shown, or sequential order, to achieve the desired results.

[0089] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, back, etc.) are only used to explain the relative position relationship between the components in a certain specific order (as shown in the accompanying drawings). If the specific order changes, the directional indication will also change accordingly.

[0090] In the description of the present invention, the terms "first" and "second" are used solely to facilitate description of different components or names and should not be construed as indicating or implying a sequential relationship, relative importance, or implicitly specifying the quantity of the technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0091] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0092] It should be noted that although the specific embodiments of the present invention are described in detail in conjunction with the accompanying drawings, this should not be construed as limiting the scope of protection of the present invention. Within the scope described by the claims, various modifications and variations that can be made by those skilled in the art without creative effort still fall within the scope of protection of the present invention.

[0093] The examples of the embodiments of the present invention are intended to briefly illustrate the technical features of the embodiments of the present invention so that those skilled in the art can intuitively understand the technical features of the embodiments of the present invention, and are not intended to improperly limit the embodiments of the present invention.

[0094] 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 various embodiments of the present invention.

Claims

1. A method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation, characterized in that: include: Construct a Venturi tube model based on the preset dimensions of each part of the Venturi tube; Constructing a rotating separator model according to preset internal parameters of the rotating separator; Combining the Venturi tube model and the rotary separator model, a three-dimensional geometric model for gas-liquid multi-stage separation is constructed; Setting general parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, performing numerical simulation and obtaining simulation results; The simulation results are extracted and analyzed to obtain separation prediction results.

2. The method according to claim 1, characterized in that The preset dimensions of each part of the venturi tube include the throat diameter, the contraction section and the divergence section angle.

3. The method according to claim 2, characterized in that The left side of the Venturi tube model is a gas-liquid two-phase flow inlet, and the right side is divided into a waste liquid outlet and an enrichment outlet.

4. The method according to claim 1, wherein The preset internal parameters of the rotary separator include the shape, number and pitch of the spiral blades.

5. The method according to claim 1, wherein Also includes: generating a surface mesh according to preset dimensions of various parts of the venturi tube and preset internal parameters of the rotary separator; The volume meshes of the venturi tube model and the rotating separator model are generated by updating the boundary conditions of the surface mesh, creating a region description geometry, setting the update region type, and adding a boundary layer.

6. The method according to claim 1, characterized in that The separation prediction results include a dynamic gas volume fraction change curve and a volume fraction distribution cloud diagram of the multi-stage separation structure.

7. A downhole gas-liquid multi-stage separation result prediction system based on numerical simulation, characterized in that: include: Geometric modeling module: used to construct a Venturi tube model based on the preset dimensions of each part of the Venturi tube; to construct a rotary separator model based on the preset internal parameters of the rotary separator; and to build a three-dimensional geometric model for gas-liquid multi-stage separation by combining the Venturi tube model and the rotary separator model; Numerical simulation module: used to set the general parameters, materials, multiphase flow model and boundary conditions of the three-dimensional geometric model, perform numerical simulation and obtain simulation results; Result output module: used to extract and analyze the simulation results to obtain separation prediction results.

8. The system according to claim 7, characterized in that Also includes: A mesh generation module is used to generate a surface mesh according to the preset dimensions of each part of the venturi tube and the preset internal parameters of the rotary separator; The volume meshes of the venturi tube model and the rotating separator model are generated by updating the boundary conditions of the surface mesh, creating a region description geometry, setting the update region type, and adding a boundary layer.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation as described in any one of claims 1 to 6 are implemented.

10. A computer storage medium, characterized in that The computer storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for predicting downhole gas-liquid multi-stage separation results based on numerical simulation according to any one of claims 1 to 6.

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