Simulation system and method of natural gas hydrate system, electronic equipment and storage medium

Abstract

The invention discloses a simulation system and method of a natural gas hydrate system, electronic equipment and a storage medium. The system comprises a natural gas hydrate system simulation module and a data processing module, wherein the natural gas hydrate system simulation module is used for acquiring hydrate system data corresponding to a target area, establishing a reservoir simulation model corresponding to the target area according to the hydrate system data, and performing simulated gas production simulation based on the reservoir simulation model; and the data processing module is used for collecting simulated gas production data corresponding to the reservoir simulation model in the simulated gas production simulation process and processing the simulated gas production data to obtain a simulation result. Based on the technical scheme, the reservoir simulation model corresponding to the target area is established to simulate the hydrate system of the target area, and the hydrate system of the target area is accurately evaluated according to the simulation data, so that accurate data support can be provided for exploitation of the natural gas hydrate system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas hydrate simulation, and particularly relates to a simulation system and method for a natural gas hydrate system, an electronic device and a storage medium. BACKGROUND

[0002] As a potential replacement energy, the natural gas hydrate system has the advantages of wide distribution, large reserves, high energy density and environmental friendliness. It is estimated that the total amount of organic carbon in the global natural gas hydrate system is about twice that of traditional fossil energy, which is the strategic commanding point for future global energy development.

[0003] However, the traditional exploitation method is to carry out production improvement for a single well. Although the production capacity is improved, it is difficult to implement large-scale permeability improvement operation around the well, resulting in that the single well development capacity of the hydrate system is still far below the commercial development standard. In addition, due to the strong heterogeneity of the single hydrate system reservoir, it is not conducive to long-term high yield, thereby reducing the exploitation amount of the natural gas hydrate system. SUMMARY

[0004] The present application provides a simulation system and method for a natural gas hydrate system, an electronic device and a storage medium. The reservoir simulation model corresponding to the target area is established to simulate the hydrate system of the target area, and the hydrate system of the target area is accurately evaluated according to the simulation data, thereby providing accurate data support for the exploitation of the natural gas hydrate system.

[0005] According to an aspect of the present application, a simulation system for a natural gas hydrate system is provided, wherein the system comprises a natural gas hydrate system simulation module and a data processing module; wherein,

[0006] The natural gas hydrate system simulation module is configured to obtain hydrate system data corresponding to a target area, establish a reservoir simulation model corresponding to the target area according to the hydrate system data, and perform simulation gas production simulation based on the reservoir simulation model.

[0007] The data processing module is configured to collect simulation gas production data corresponding to the reservoir simulation model during the simulation gas production simulation, and process the simulation gas production data to obtain simulation results.

[0008] According to another aspect of the present application, a simulation method for a natural gas hydrate system is provided, wherein the method is applied to a simulation system for a natural gas hydrate system, and the system comprises a natural gas hydrate system simulation module and a data processing module; the method comprises:

[0009] obtain hydrate system data corresponding to the target region through a natural gas hydrate system simulation module, establish a reservoir simulation model corresponding to the target region according to the hydrate system data, and perform a simulation gas production simulation based on the reservoir simulation model;

[0010] In the process of the simulation gas production simulation, the data processing module collects simulation gas production data corresponding to the reservoir simulation model, and processes the simulation gas production data to obtain a simulation result.

[0011] According to another aspect of the present application, an electronic device is provided, which comprises:

[0012] at least one processor; and

[0013] a memory in communication with the at least one processor; wherein

[0014] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the simulation method of the natural gas hydrate system according to any one of the embodiments of the present application.

[0015] According to another aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for enabling a processor to perform the simulation method of the natural gas hydrate system according to any one of the embodiments of the present application when executed by the processor.

[0016] The technical solution of the embodiments of the present application obtains hydrate system data corresponding to the target region through a natural gas hydrate system simulation module, establishes a reservoir simulation model corresponding to the target region according to the hydrate system data, and performs a simulation gas production simulation based on the reservoir simulation model. In the process of the simulation gas production simulation, the data processing module collects simulation gas production data corresponding to the reservoir simulation model, and processes the simulation gas production data to obtain a simulation result. Based on the above technical solution, the hydrate system of the target region is simulated by establishing a reservoir simulation model corresponding to the target region, the hydrate system of the target region is accurately evaluated according to the simulation data, and accurate data support is provided for the exploitation of the natural gas hydrate system.

[0017] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments description. Obviously, the drawings in the following description only show some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0019] Figure 1 is a structural schematic diagram of a simulation system of a natural gas hydrate system provided by an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of a main kettle body provided by an embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of a simulation system of a natural gas hydrate system provided by an embodiment of the present application;

[0022] Figure 4 is a flow chart of a simulation method of a natural gas hydrate system provided by an embodiment of the present application;

[0023] Figure 5 is a structural schematic diagram of another simulation system of a natural gas hydrate system provided by an embodiment of the present application;

[0024] Figure 6 is a structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical personnel in the art better understand the present application scheme, the following will combine the drawings in the embodiments of the present application, and clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should be within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] Example 1

[0028] Figure 1 This is a structural diagram of a simulation system for a natural gas hydrate system provided in an embodiment of the present invention. Figure 1 As shown, the system includes: a natural gas hydrate system simulation module 110 and a data processing module 120; wherein,

[0029] The natural gas hydrate system simulation module is used to acquire hydrate system data corresponding to the target area, establish a reservoir simulation model corresponding to the target area based on the hydrate system data, and perform simulated gas production based on the reservoir simulation model; the data processing module is used to collect simulated gas production data corresponding to the reservoir simulation model during the simulated gas production process, and process the simulated gas production data to obtain simulation results.

[0030] The target area can be a region to be exploited that requires simulation of a rotational well production scheme. It should be noted that the technical solution of this invention is for optimizing and evaluating a multi-well rotational well production method for hydrate systems; therefore, the target area can be a natural gas-rich area located in the ocean. The reservoir simulation model can be a physical model constructed based on reservoir data. Simulated gas production data can be understood as the production data generated during the simulation process.

[0031] Specifically, hydrate system data for the target area is collected through multiple channels, integrating geological exploration data, including seismic exploration and well logging data, to obtain information on the stratigraphic structure and lithological distribution of the target area. Geochemical analysis is combined to clarify key parameters such as the occurrence state and saturation of hydrates. Simultaneously, experience data on hydrate development in surrounding areas is referenced. The above multi-source data are integrated to form a comprehensive and accurate hydrate system dataset for the target area. Based on the hydrate system data, a reservoir simulation model corresponding to the target area is established. Based on the established reservoir simulation model, different extraction schemes are set, such as extraction pressure, extraction rate, and well location layout, to conduct simulated gas production. During the simulation, data such as gas production, water production, and pressure changes of each simulated well at different time steps are calculated. During the simulated gas production process, simulated gas production data corresponding to the reservoir simulation model is collected using a data acquisition interface, including instantaneous gas production, cumulative gas production, pressure-time curves, and temperature-time curves of each simulated well. The data processing module then preprocesses the collected simulated gas production data, including data cleaning to remove outliers and noise interference; data normalization to unify data of different dimensions to the same scale for easier subsequent analysis; and calculation of parameters such as the average and variance of gas production based on the preprocessed data. Finally, curve fitting is used to analyze the trend of gas production over time. Natural gas hydrate systems include hydrate layers, associated gas layers, and underlying shallow gas layers.

[0032] It should be noted that the reservoir simulation model comprises a main kettle body and a perforated sand filter screen; the perforated sand filter screen is arranged in the main kettle body; and the main kettle body is provided with a simulated reservoir.

[0033] The main kettle body is made of high-strength carbon steel, has a certain thickness, is in a cubic structure, and has a size of generally greater than or equal to 50 cm*40 cm*50 cm, a thickness of generally greater than 2 cm, and a pressure resistance of not less than 30 MPa. The upper end face and the side end face of the main kettle body are perforated according to experimental requirements, and the perforation size and number can be determined according to actual requirements. The upper end face and the side end cover are detachable and are connected by flanges or threads. The perforations in the upper end cover can be arranged in a longitudinal and transverse cross pattern of 6*5, and a one-way sealing threaded joint is arranged at the perforation position to meet the subsequent evaluation experimental requirements under different group well arrangement schemes.

[0034] It should be noted that the one-way sealing threaded joint is made of carbon steel, and a single-flow valve is arranged inside the joint. When the hydrate system is synthesized, the joint is sealed, but when the evaluation experiment is carried out, the hollow pipe string is screwed in by threads, the threaded joint is completely opened, the gas-liquid sand in the simulated reservoir can pass through, and the production process is simulated.

[0035] On the basis of the above technical scheme, the natural gas hydrate system simulation module comprises a perforated sand filter screen arrangement unit; the perforated sand filter screen arrangement unit is used to determine a simulated well arrangement scheme corresponding to a simulated round mining scheme, and the perforated sand filter screen is arranged in the main kettle body according to the simulated well arrangement scheme.

[0036] The simulated well arrangement scheme comprises an arrangement number and an arrangement position. The perforated sand filter screen can be a device for constructing a simulated wellhead, and the prefabricated perforated sand filter screen is used to simulate the production of a wellbore in a well. The device can be customized from steel such as 304 and 316, or can be made by resin demolding. It should be noted that the prefabricated perforated sand filter screen is provided with perforations, and the size, number and distribution of the perforations need to be set according to actual experimental requirements.

[0037] Specifically, the specific requirements of the number and position of the simulation wells are determined according to the simulation well sampling scheme. The geological characteristics of the target reservoir, such as permeability, porosity distribution, and the occurrence state of hydrates, and other factors are comprehensively considered, and simulation analysis is performed on different combinations of the number and position of the simulation wells to evaluate the influence on the gas production effect, well interference, and other aspects. According to the determined simulation well layout scheme, precise marking is performed on the main kettle body, the perforated sand filter net is firmly installed in the corresponding position of the simulation well in the main kettle body, the sealing and stability of the installation are ensured, and displacement or leakage of the sand filter net during the experiment is prevented. For example, according to the purpose of the experiment, a prefabricated perforated sand filter net is inserted into the main kettle body, and the number of the sand filter net is determined according to the research purpose. The simulation production well can be adjusted in a manner according to actual needs, including but not limited to linear group wells, or circumferential layout of sub-circles, or hexagonal honeycomb layout, and the like.

[0038] On the basis of the above technical scheme, the natural gas hydrate system simulation module comprises a simulation reservoir construction unit; wherein the simulation reservoir construction unit is used for determining the formation parameters corresponding to the simulation formation according to the hydrate system data, and constructing a simulation reservoir in the main kettle body based on the formation parameters.

[0039] The simulation reservoir comprises a hydrate layer, an associated gas layer, and a shallow gas layer. The formation parameters are the actual formation parameters of the target region, including formation density, temperature, pressure value, and other parameters.

[0040] Specifically, the obtained hydrate system data is analyzed, covering multiple information such as geological exploration and geochemical analysis, and the porosity, permeability, saturation, temperature, pressure, and other parameters of the simulation formation are determined in combination with the geological characteristics of the target region. At the same time, considering the heterogeneity of the formation, the parameters of different regions are set differently to ensure that the parameters can truly reflect the actual formation conditions, and then the simulation reservoir is constructed in layers in the main kettle body based on the determined formation parameters. The hydrate layer, the associated gas layer, and the shallow gas layer are constructed in sequence according to the actual formation sequence. The technical scheme of the embodiment of the present application precisely controls the thickness and parameters of each layer to ensure that the simulation reservoir is highly similar to the actual formation in structure and physical properties, thereby providing a reliable basis for subsequent experiments.

[0041] On the basis of the above technical scheme, the simulation reservoir construction unit comprises a reservoir particle filling sub-unit; wherein the reservoir particle filling sub-unit is used for determining the filling particle density and filling particle composition corresponding to each simulation formation according to the hydrate system data, and performing reservoir particle filling according to the filling particle density and the filling particle composition.

[0042] The filling particle density can be understood as the density of the lower layer filler, and the corresponding filling particle composition can be understood as the composition of the filler. It should be noted that the parameters of the filler correspond to the actual geological data of the target area, that is, the filling particle density and the filling particle composition are matched with the actually collected data.

[0043] Specifically, the collected hydrate system data is comprehensively and deeply analyzed, covering geological exploration reports, core analysis data, geophysical logging data, and the geological structure characteristics and sedimentary environment of the target area. For different simulated strata, the lithology, porosity, permeability, and other parameters are determined, and the matching filling particle composition, such as the specific proportion of quartz sand, feldspar, and clay minerals, is determined. The filling particle density of each simulated stratum is calculated. Based on the determined filling particle density and composition, appropriate particle materials are selected, and a layered filling and mechanical vibration method is used to slowly and uniformly fill the particles to the corresponding simulated stratum position in the main kettle body, ensuring that the filling process is dense and uniform, and the structure and physical properties of the actual reservoir are restored to the greatest extent. For example, the filling particles can be laid in the main kettle body according to the predetermined thickness, for example, 5 cm thick filling particles are laid each time, and the filling time interval between each layer is one hour.

[0044] For example, using the main kettle body in Figure 2 , the three corresponding reservoir particles of the hydrate system are filled into the kettle body in the same density, and the particle size distribution and composition of the filled particles also need to be consistent with the stratum. If conditions permit, it is recommended to use in-situ samples. According to the different porosities and water contents of the three layers, the required liquid and gas volumes for filling into the kettle body are calculated, wherein the liquid can use NaCl brine or seawater, and the gas uses methane gas with a purity of 99%. In addition to the hydrate layer, the water in the associated gas layer and the shallow gas layer is added in proportion during the sample filling stage. The subsequent injected liquid is mainly used for synthesizing hydrates in the top hydrate layer.

[0045] On the basis of the above technical solutions, the simulated reservoir construction unit comprises a fluid filling sub-unit; wherein the fluid filling sub-unit is used to determine the fluid filling amount corresponding to each simulated stratum according to the hydrate system data, and after the reservoir particle filling is completed, the fluid filler is filled into the each simulated stratum through the fluid injection pipe according to the fluid filling amount.

[0046] The fluid includes liquid and gas; the length of the fluid injection pipe is greater than the length of the main kettle body. The fluid filling amount can be the number of filled fluids, and can include liquid filling amount and gas filling amount.

[0047] Specifically, the hydrate system data is analyzed, combined with the geological data of the target area and the previous research results, the key parameters of each simulated formation such as porosity, permeability, saturation, and the distribution law of the fluid in the actual formation are considered, the filling amount of the liquid such as water, formation water and the gas such as methane and carbon dioxide required by each simulated formation is determined, and then after the reservoir particle filling is completed, the fluid injection pipe with a length greater than the length of the main kettle body is used to ensure that it can reach the simulated formation at different positions in the main kettle body. The liquid and gas with the determined proportion and amount are filled into each simulated formation through high-precision pumping equipment according to the calculated fluid filling amount, and the fluid filling is slowly and stably filled into each simulated formation through the fluid injection pipe. It should be noted that the pressure and flow rate are monitored in real time during the filling process to ensure the accuracy and uniformity of the filling.

[0048] For example, after the simulation of the wellbore, reservoir, hydrate layer, associated gas layer and shallow gas layer is completed, the fluid injection pipe is slowly pulled out. It should be noted that the opening mode and length of the fluid injection pipe must match the main kettle body. Generally, the unopened section of the left side of the fluid injection pipe should be as long as possible, the length of the fluid injection pipe is 1.5 times the length of the kettle body, and a thickening layer can be added to the left side of the main kettle body to ensure that the pressure in the kettle body does not communicate with the outside through the opening in the fluid injection pipe during the pulling process of the fluid injection pipe. The thickening layer can achieve this scheme. When the rightmost side of the fluid injection pipe leaves the leftmost inner end face of the main kettle body, the one-way check valve is closed to maintain the pressure system in the main kettle body stable.

[0049] On the basis of the above technical scheme, the system further comprises a temperature control box, wherein the main kettle body is arranged in the temperature control box, a heater and a cooler are arranged in the temperature control box, and the temperature control box is used to control the simulation temperature of the main kettle body.

[0050] Specifically, the main kettle body is placed in the temperature control box, and the heater and the refrigerator arranged in the box work cooperatively to realize accurate control of the simulated temperature of the main kettle body, thereby providing a stable and controllable temperature environment for the formation, decomposition and mining process of natural gas hydrate under different geological conditions. The temperature control box has a shell made of a material with good heat insulation performance, thereby effectively reducing the influence of the external environment temperature on the inside. The heater and the refrigerator are reasonably arranged in the box. The heater is a high-efficiency electric heating pipe, which is uniformly distributed to ensure rapid heating and balanced temperature field. The refrigerator is a semiconductor refrigeration sheet, which has the advantages of rapid refrigeration and accurate control. At the same time, a high-precision temperature sensor is provided to monitor the temperature around the main kettle body in real time and feed back the data to the temperature control system. The temperature control system compares the actual temperature value fed back by the temperature sensor with the temperature parameter set according to the experiment, and automatically adjusts the working state of the heater or the refrigerator. When the actual temperature is lower than the set value, the heater is started to increase the temperature; when the actual temperature is higher than the set value, the refrigerator is started to decrease the temperature. Through the PID control algorithm, the power of heating or refrigeration is accurately adjusted, so that the temperature of the main kettle body is quickly and stably controlled at the set value, the temperature fluctuation range is controlled within a very small range, and the strict requirement of the experiment on the temperature accuracy is met.

[0051] It should be noted that, as Figure 3As shown, the composition includes: prefabricated perforated sand screen for simulating production wellbore in the well, the component can be customized with 304, 316 steel, or resin demolding, the size, number and distribution of the perforated hole need to be set according to the actual experimental requirements. One-way sealed threaded joint, the joint is made of carbon steel, the inside is designed with single valve, when in the synthesis stage of hydrate system, the joint is sealed, but when carrying out evaluation experiment, the hollow string is screwed in with threaded way, the threaded joint is completely opened, so that the gas liquid sand in the simulated reservoir can pass through, simulating the mining process. Temperature sensor for measuring the temperature of the circulating bath fluid, the general accuracy requirement is ± 0.01 ℃ FS, the range is-20-100 ℃. Temperature and pressure sensor, the temperature requirement is the same as the temperature sensor, the pressure accuracy requirement is ± 0.001 MPa, the range is normal pressure-50 MPa, the tool is mainly used to evaluate the temperature field and pressure field in the main kettle body, and assess whether it meets the synthesis of hydrate requirements. The main kettle body is generally made of high-strength carbon steel, with a certain thickness, and is of cubic structure, with the size of generally ≥50cm*40cm*50cm, the thickness is generally more than 2cm, and the pressure resistance is not less than 30MPa. The upper end face and side end face of the main kettle body are perforated according to the experimental requirements, and the size and number of the perforation can be determined according to the actual requirements. The upper end cover and side end cover can be detached, and are connected by flange or threaded connection. The upper end cover is perforated with longitudinal and transverse intersection 6*5, and 2 is installed at the perforation position to meet the subsequent evaluation experiment requirements under different group well layout schemes. The fluid injection pipe is made of high-strength alloy steel, with a diameter of generally ≤5mm, and is uniformly perforated to meet the injection requirements of liquid and gas. The length can be customized according to the size of the kettle body. The pipeline is made of stainless steel or high-pressure hose, and the diameter can be customized according to the requirements to meet the functional requirements. The pipeline of the circulating bath is generally made of high-pressure hose, and the other pipelines are generally made of carbon steel or stainless steel to meet the high-pressure requirements. The circulating bath pump is used to circulate and cool the frozen liquid. The wire is used to transmit electrical signals. The joint can be USB, C port or direct connection. The data display and processing control terminal is an integrated computer controller, which integrates various sensors, control valves, pumps and container capacity data in the processor, for comprehensive processing, analysis and control of the experimental device. The gas booster pump is used to compress the gas from low pressure to high pressure and pump it into the main kettle body. The commonly used gas can be boosted to 20MPa, with a flow range of 0-100mL / min, and an accuracy of better than 0.001mL / min. The gas flow controller is used to control the gas amount entering the gas booster pump from the gas volume, and can also count the cumulative gas amount through the control valve. The total amount and gas transmission rate data will be transmitted to the data display and processing control terminal for integrated control, monitoring and subsequent analysis.The gas container is a methane cylinder with a pressure rating of 10 MPa; the liquid container is seawater or saltwater with a volume of ≥100 L; the mass flow pump is a device for pumping liquid from the liquid container into the main kettle body, with a flow range of 0-200 mL / min, an accuracy of better than 0.001 mL / min, stepless speed regulation, and a maximum pressure of no less than 30 MPa. The pump can monitor data such as instantaneous rate and cumulative flow. The one-way check valve has a function similar to that of a one-way sealing threaded joint. When the fluid injection pipe is inserted into the main kettle body, it can play a sealing role. At the same time, when the fluid injection pipe is gradually removed from the main kettle, the tip of the fluid injection pipe is displaced in the wall thickness of the main kettle, and the check valve can automatically close to ensure that the pressure in the main kettle remains constant.

[0052] The temperature control box is a package for circulating the chilled liquid, which can lower the main kettle body as a whole to a certain fixed temperature, and needs to be frequently used in the process of synthesizing hydrates. It is generally made of carbon steel structure. The liquid collector is used to collect the liquid produced in the simulated wellbore, and at the same time, the solid particles are separated into the sand collector, which can be weighed finally for evaluating the effect of gas production, water production and sand production. The gas vent valve is used to discharge the gas produced in the perforated sand screen. The sand collector and the liquid collector are used together to collect the sand produced in the simulated wellbore and measure the mass and particle size for analyzing the sand production. The cooling box is a tool for cooling at the top of the main kettle body, with a built-in refrigerator, which provides a cold source through power compression. It is a common device, and the cooling box is reserved with the same opening as the top plate of the main kettle body to ensure the subsequent experimental requirements. The refrigerator is placed in the cooling box and provides a cold source through power supply. The hydrate layer is used to simulate the actual production hydrate layer during the sample preparation and sand filling process, so its characteristics should be the same as those of the target hydrate layer, which will be introduced in detail in the subsequent evaluation stage. The associated gas layer simulates the associated gas layer below the hydrate. The shallow gas layer simulates the shallow gas layer below the associated gas. The control box is used to control the temperature of the heating box and the cooling box. Its data are connected and transmitted with the data display and processing control terminal. The power supply is used to power the refrigerator and the heater. The data display and processing control terminal have the same effect as the data display and processing control terminal. They can be the same system or two systems, without specific quantity requirements. The heater is generally made of resistance wire. The heating box is used in combination with the cooling box to make the main kettle body produce the same temperature field as the low temperature gradient of the hydrate system reservoir to be studied. The temperature insulation layer is generally made of temperature insulation material, wrapped with numerical material or metal material outside, used to ensure the stability of the temperature system of the main kettle body, and to manufacture the same temperature field as the reservoir. The constant temperature room generally recommends that the above devices are placed in a constant temperature room, which can control the temperature and humidity of the room to keep them constant, to improve the efficiency and accuracy of the experiment. If there is no constant temperature room, the above experimental devices can also meet the requirements, but the existence of the constant temperature room can be more conducive to the development of the experiment.

[0053] The technical scheme of the embodiment of the present application obtains hydrate system data corresponding to a target region through a natural gas hydrate system simulation module, establishes a reservoir simulation model corresponding to the target region according to the hydrate system data, performs simulation gas production simulation based on the reservoir simulation model, and collects simulation gas production data corresponding to the reservoir simulation model in the process of the simulation gas production simulation through the data processing module, and processes the simulation gas production data to obtain simulation results. Based on the above technical scheme, the hydrate system of the target region is simulated by establishing a reservoir simulation model corresponding to the target region, the hydrate system of the target region is accurately evaluated according to the simulation data, and accurate data support is provided for hydrate natural gas exploitation.

[0054] Embodiment two

[0055] Figure 4 A flowchart of a simulation method of a natural gas hydrate system provided by the embodiment of the present application. The simulation system applied to the natural gas hydrate system includes a natural gas hydrate system simulation module and a data processing module. As shown in the figure, the method includes: Figure 4

[0056] S410, obtaining hydrate system data corresponding to a target region through a natural gas hydrate system simulation module, establishing a reservoir simulation model corresponding to the target region according to the hydrate system data, and performing simulation gas production simulation based on the reservoir simulation model;

[0057] S420, collecting simulation gas production data corresponding to the reservoir simulation model in the process of the simulation gas production simulation through the data processing module, and processing the simulation gas production data to obtain simulation results.

[0058] On the basis of the above technical scheme, the reservoir simulation model includes a main kettle body and a perforated sand filter screen; the perforated sand filter screen is arranged in the main kettle body; and a simulated reservoir is arranged in the main kettle body.

[0059] On the basis of the above technical scheme, the natural gas hydrate system simulation module includes a perforated sand filter screen laying unit; a simulation well laying scheme corresponding to a simulation round mining scheme is determined through the perforated sand filter screen laying unit, and the perforated sand filter screen is arranged in the main kettle body according to the simulation well laying scheme; wherein, the simulation well laying scheme includes a laying number and a laying position.

[0060] ​On the basis of the above technical scheme, the natural gas hydrate system simulation module comprises: a simulation reservoir construction unit; through the simulation reservoir construction unit, a formation parameter corresponding to a simulation formation is determined according to the hydrate system data, and a simulation reservoir is constructed in the main kettle body based on the formation parameter; wherein the simulation reservoir comprises a hydrate layer, an associated gas layer and a shallow gas layer.

[0061] On the basis of the above technical scheme, the simulation reservoir construction unit comprises: a reservoir particle filling subunit; the reservoir particle filling subunit determines a filling particle density and a filling particle composition corresponding to each simulation formation according to the hydrate system data, and performs reservoir particle filling according to the filling particle density and the filling particle composition.

[0062] On the basis of the above technical scheme, the simulation reservoir construction unit comprises: a fluid filling subunit; the fluid filling subunit determines a fluid filling amount corresponding to each simulation formation according to the hydrate system data, and fills a fluid filling material to the simulation formation according to the fluid filling amount through a fluid injection pipe after the reservoir particle filling is completed, wherein the fluid comprises a liquid and a gas; and the length of the fluid injection pipe is greater than the length of the main kettle body.

[0063] On the basis of the above technical scheme, the system further comprises: a temperature control box; the main kettle body is arranged in the temperature control box, a heater and a refrigerator are arranged in the temperature control box, and the temperature control box is used for controlling the simulation temperature of the main kettle body.

[0064] Exemplarily, the technical scheme of the present application can be combined with Figure 5 The technical scheme of the present application is further described as follows. Figure 5 As shown, according to the purpose of the experiment, a pre-prepared perforated sand filter screen is inserted into the main kettle body, the number of the sand filter screen is determined according to the research purpose, and is used for simulating a production well. The mode can also be adjusted according to actual needs, including but not limited to linear group wells, or circumferentially arranged sub-circles, or hexagonal honeycomb arrangement, etc., which can meet the needs of the experiment. Secondly, the reservoir particles of the three layers of the hydrate system are filled into the main kettle body in the same density, wherein the particle size distribution and the component composition of the filled particles also need to be consistent with the formation, and if the conditions permit, it is recommended to use in-situ samples. According to the different porosities and water contents of the three layers, the required liquid and gas amounts injected into the kettle body are calculated, wherein the liquid can use NaCl brine or seawater, and the gas uses methane gas with a purity of 99%. In addition to the hydrate layer, the water of the lower associated gas layer and the shallow gas layer is added in proportion during the sample filling stage. The subsequent injected liquid is mainly used for synthesizing hydrate in the top hydrate layer.

[0065] At the same time of injection, the temperature of the main kettle body needs to be reduced to the design temperature by using a circulating bath pump, which can be 10 degrees Celsius or lower, and the temperature of the general reservoir is in the range of 6-15 degrees Celsius. When the temperature is reduced and maintained at the set value, the high-pressure gas and liquid injected by the mass flow pump and the gas booster pump will gradually increase the pressure inside the main kettle body. According to the hydrate phase equilibrium curve, under certain low temperature conditions, when the pressure rises to a certain value, hydrates will gradually form. Ensure that the injected gas and liquid are slow (gas not higher than 5 mL / min; liquid not higher than 3 mL / min) to enable the gas and liquid to fully migrate in the sample filling area inside the main kettle body to ensure that the final formed hydrates can be uniformly dispersed in the simulated hydrate layer, and the methane gas can be uniformly dispersed in the associated gas layer and the shallow gas layer. The injection process uses gas and liquid pumps to fine control the amount of pump-in.

[0066] When the simulation of the wellbore, reservoir, hydrate layer, associated gas layer, and shallow gas layer is completed, the fluid injection pipe is slowly pulled out. It is important to note that the opening mode and length of the fluid injection pipe must match the main kettle body. Generally, the left side of the fluid injection pipe without openings should be as long as possible (1.5 times the kettle body), and a thickening layer can be added to the left side of the main kettle body to ensure that the pressure inside the kettle body does not communicate with the outside world through the openings in the fluid injection pipe during the pulling process. The thickening layer can achieve this goal. When the rightmost side of the fluid injection pipe leaves the leftmost inner end surface of the main kettle body, the one-way check valve closes to maintain the pressure system inside the main kettle body stable.

[0067] After the main kettle body is completed, it is removed and placed in the evaluation module shown in Figure 5 , and then the thermal insulation layer, the cooling box, and the upper pipe of the perforated sand screen pipe are connected respectively. When installing the upper pipe of the perforated sand screen pipe, gradually enter the main kettle body by screwing, and keep the gas flow control valve closed to enable the upper pipe of the perforated sand screen pipe to communicate with the perforated sand screen pipe smoothly and maintain the constant pressure inside the main kettle body. At the same time, the one-way sealing threaded joint also plays its own role.

[0068] The technical scheme of the embodiment of the present application obtains hydrate system data corresponding to a target region through a natural gas hydrate system simulation module, establishes a reservoir simulation model corresponding to the target region according to the hydrate system data, performs simulation gas production simulation based on the reservoir simulation model, collects simulation gas production data corresponding to the reservoir simulation model in the process of the simulation gas production simulation through the data processing module, and processes the simulation gas production data to obtain simulation results. Based on the above technical scheme, the hydrate system of the target region is simulated by establishing a reservoir simulation model corresponding to the target region, the hydrate system of the target region is accurately evaluated according to simulation data, and accurate data support is provided for hydrate natural gas exploitation.

[0069] Embodiment three

[0070] Figure 6 A structural schematic diagram of an electronic device 10 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application described and / or claimed in this document.

[0071] As Figure 6 shown, the electronic device 10 includes at least one processor 11, and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected with the at least one processor 11, wherein the memory stores a computer program that can be executed by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or loaded into the random access memory (RAM) 13 from the storage unit 18. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected with each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0072] A plurality of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0073] The processor 11 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 performs various methods and processes described above, such as the simulation method of the natural gas hydrate system.

[0074] In some embodiments, the simulation method of the natural gas hydrate system can be implemented as a computer program tangibly embodied in a computer readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded onto the RAM 13 and executed by the processor 11, one or more steps of the simulation method of the natural gas hydrate system described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to perform the simulation method of the natural gas hydrate system by any other appropriate means, such as by means of firmware.

[0075] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0076] Computer programs for implementing the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer program, when executed, enables the functions / acts specified in the flowcharts and / or block diagrams to be implemented. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package and partially on a remote machine or entirely on a remote machine or server.

[0077] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of electrical connections, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0078] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0079] The systems and techniques described herein can be implemented in a computing system that includes a back end component, e.g., as a data server, or that includes a middleware component, e.g., an application server, or that includes a front end component, e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described herein, or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication, e.g., a communication network. Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0080] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0081] It should be understood that the various forms of flow shown above can be re-ordered, added to, or deleted from without departing from the scope of the present disclosure. For example, the steps recited in the present disclosure can be executed in parallel, executed in sequence, or executed in different orders, as long as the desired results of the technical solutions of the present disclosure can be achieved, and the present disclosure is not limited herein.

[0082] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A simulation system for a natural gas hydrate system, characterized in that, The system includes: a natural gas hydrate system simulation module and a data processing module; wherein... The natural gas hydrate system simulation module is used to acquire hydrate system data corresponding to the target area, establish a reservoir simulation model corresponding to the target area based on the hydrate system data, and perform gas production simulation based on the reservoir simulation model. The data processing module is used to collect simulated gas production data corresponding to the reservoir simulation model during the simulated gas production process, and to process the simulated gas production data to obtain simulation results.

2. The system according to claim 1, characterized in that, The reservoir simulation model includes a main vessel body and a perforated filter screen; the perforated filter screen is disposed inside the main vessel body; a simulated reservoir is disposed inside the main vessel body.

3. The system according to claim 2, characterized in that, The natural gas hydrate system simulation module includes: a perforated filter screen laying unit; wherein, The perforated filter screen placement unit is used to determine the simulated well placement scheme corresponding to the simulated rotation mining scheme, and to place the perforated filter screen in the main vessel body according to the simulated well placement scheme; wherein, the simulated well placement scheme includes the number of placements and the placement positions.

4. The system according to claim 2, characterized in that, The natural gas hydrate system simulation module includes: a simulated reservoir construction unit; wherein, The simulated reservoir construction unit is used to determine the formation parameters corresponding to the simulated formation based on the hydrate system data, and to construct the simulated reservoir in the main reactor body based on the formation parameters; wherein, the simulated reservoir includes a hydrate layer, an associated gas layer, and a shallow gas layer.

5. The system according to claim 3, characterized in that, The simulated reservoir construction unit includes: a reservoir particle filling subunit; wherein, The reservoir particle filling subunit is used to determine the filling particle density and filling particle composition corresponding to each simulated formation based on the hydrate system data, and to fill the reservoir particles according to the filling particle density and filling particle composition.

6. The system according to claim 4, characterized in that, The simulated reservoir construction unit includes: a fluid-filled subunit; wherein, The fluid filling subunit is used to determine the fluid filling amount corresponding to each simulated formation based on the hydrate system data, and after the reservoir particles are filled, to fill the simulated formation with fluid filler material through the fluid injection pipe according to the fluid filling amount. The fluid includes liquid and gas. The length of the fluid injection pipe is greater than the length of the main vessel body.

7. The system according to claim 2, characterized in that, The system also includes: a temperature control box; wherein... The main vessel is housed inside the temperature control box, which contains a heater and a cooler. The temperature control box is used to control the simulated temperature of the main vessel.

8. A simulation method for a natural gas hydrate system, characterized in that, A simulation system for natural gas hydrate systems, the system comprising: a natural gas hydrate system simulation module and a data processing module; the method comprising: The hydrate system data corresponding to the target area is obtained through the natural gas hydrate system simulation module. A reservoir simulation model corresponding to the target area is established based on the hydrate system data, and gas production simulation is performed based on the reservoir simulation model. During the simulated gas production process, the data processing module collects simulated gas production data corresponding to the reservoir simulation model and processes the simulated gas production data to obtain simulation results.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the simulation method for the natural gas hydrate system as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause a processor to execute the simulation method for the natural gas hydrate system as described in claim 8.

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