Method and device for determining injection-production rate of salt-cavern gas storage and electronic equipment

Abstract

The invention belongs to the technical field of energy storage, and particularly relates to a salt-cavern gas storage injection-production rate determination method and device and electronic equipment. The method comprises the following steps: establishing a physical model of the salt-cavern gas storage, and deducing real-time temperature and real-time pressure of the gas storage according to the physical model; deducing the injectable natural gas quantity and the recoverable natural gas quantity of the gas storage by combining the natural gas physical property parameters; determining a gas injection boundary condition for guaranteeing the stability of the surrounding rock, and / or determining a gas production boundary condition for guaranteeing the stability of the surrounding rock; the gas injection rate is determined according to the gas injection boundary conditions capable of guaranteeing the stability of the surrounding rock, and / or the gas production rate is determined according to the gas production boundary conditions capable of guaranteeing the stability of the surrounding rock. By adopting the method disclosed by the invention, the gas injection and production boundary conditions of the gas storage capable of guaranteeing the stability of surrounding rock can be quickly and accurately deduced to determine the injection and production rate, so that the problem of poor stability of the gas storage caused by overlarge change rate of the gas storage capacity is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a method, a device and an electronic device for determining the injection and production rate of a salt cavern gas storage. Background Art

[0002] Under the dual carbon goals, the storage and utilization of natural gas has become a research hotspot. Natural gas capture, utilization and storage is an emerging technology with large-scale CO2 emission reduction potential, which is of great significance to the global medium- and long-term response to climate change and the promotion of domestic green, circular and low-carbon development. In the capture, transportation, utilization and storage of CCUS technology, isolating the captured CO2 from the atmosphere and storing it for a long time is the key to this technology. Salt rock has stable chemical properties and low permeability, so salt cavern gas storage can store other gases in addition to natural gas. Storing natural gas in underground salt cavern gas storage can reduce the content of natural gas in the air, give full play to the role of underground gas storage in the energy field, and support the early realization of the strategic goal of carbon neutrality. The underground salt cavern gas storage includes three parts: ground natural gas injection facilities, wellbore and cavity. Natural gas is stored in the cavity. In order to reduce the gas storage cost, as much natural gas as possible should be stored within the maximum and minimum pressure range allowed by the salt cavern gas storage. The salt cavern gas storage is deep. If the injection and production rate of the salt cavern gas storage is too high, the temperature and pressure in the salt cavity of the gas storage will change too quickly, causing the natural gas in the salt cavity to be in a supercritical state. The natural gas in the supercritical state will cause the temperature and pressure in the internal space of the cavity to be unevenly distributed, thus having a negative impact on the stability of the salt cavern gas storage. Summary of the invention

[0003] The object of the present invention is to provide a method, device and electronic equipment for determining the injection and production rate of a salt cavern gas storage, so as to solve the problem that the salt cavern gas storage has poor stability due to excessive injection and production rate of the salt cavern gas storage.

[0004] In order to solve the above technical problems, the present invention provides a method for determining the injection and production rate of a salt cavern gas storage, comprising the following steps:

[0005] 1) Establishing a physical model of the salt cavern gas storage reservoir, and deriving the real-time temperature and real-time pressure of the gas storage reservoir according to the physical model; the physical model is used to simulate the distribution of temperature and pressure in the salt cavern cavity under different injection / production boundary conditions and the real-time average temperature and real-time average pressure in the salt cavern cavity;

[0006] 2) Based on the real-time average temperature and real-time average pressure in the salt cavern cavity and the physical properties of natural gas, the injectable and recoverable natural gas volumes of the gas storage reservoir are derived;

[0007] 3) setting different gas injection boundary conditions according to the amount of natural gas that can be injected into the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas injection boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas injection boundary conditions and determining the gas injection boundary conditions that can ensure the stability of the surrounding rock; and / or setting different gas extraction boundary conditions according to the amount of natural gas that can be extracted from the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas extraction boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas extraction boundary conditions and determining the gas extraction boundary conditions that can ensure the stability of the surrounding rock;

[0008] 4) Determine the gas injection rate according to the gas injection boundary conditions that can ensure the stability of the surrounding rock, and / or determine the gas production rate according to the gas production boundary conditions that can ensure the stability of the surrounding rock.

[0009] The beneficial effects are as follows: the method of the present invention can quickly and accurately simulate and calculate the distribution of temperature and pressure in the salt cavern cavity under different injection / production boundary conditions by establishing a physical model of the salt cavern gas storage, and then analyze the stability of the surrounding rock and determine the gas storage injection and production boundary conditions that can ensure the stability of the surrounding rock, and determine the injection and production rate according to the injection and production boundary conditions. The method of the present invention can avoid the gas in the salt cavern cavity being in a supercritical state due to excessive injection and production rate, so that the temperature distribution and pressure distribution in the internal space of the gas storage are uniform, thereby ensuring the stability and reliability of the salt cavern gas storage.

[0010] Preferably, the method for establishing a physical model of a salt cavern gas storage comprises the following steps:

[0011] Obtain wellbore parameters, salt cavern cavity parameters and gas storage operation parameters;

[0012] Calculate the physical property parameters of natural gas within the preset temperature range and pressure range according to the gas database;

[0013] Based on the thermal-mechanical coupling model of the rock cavity, a physical model of the salt cavern gas storage is established according to the wellbore parameters, the salt cavern cavity parameters, the gas storage operation parameters and the physical property parameters.

[0014] Preferably, the wellbore parameters include the outer diameter of the completion string, the wall thickness of the completion string, the inner diameter of the completion string, the bottom depth of the completion string, the outer diameter of the injection and production gas string, the wall thickness of the injection and production gas string, the inner diameter of the injection and production gas string and the bottom depth of the injection and production gas string; the salt cavern cavity parameters include the shape of the salt cavern, the total volume of the salt cavern, the burial depth of the top of the salt cavern and the burial depth of the bottom of the salt cavern.

[0015] The beneficial effect is that through these wellbore parameters and salt cavern cavity parameters, the physical model of the salt cavern gas storage reservoir can be accurately constructed, thereby further improving the accuracy of the calculated real-time temperature and real-time pressure of the gas storage reservoir.

[0016] Preferably, the salt cavern cavity parameters are derived through sonar cavity measurement data.

[0017] Preferably, the sonar cavity measurement data includes measurement point, well depth, cross-sectional radius, cross-sectional area, depth range, segmented volume and cumulative volume.

[0018] Preferably, the physical property parameters include compressibility factor, density, thermal conductivity, heat capacity at constant pressure and viscosity.

[0019] Preferably, the method for deriving the amount of natural gas that can be injected into a gas storage reservoir comprises the following steps:

[0020] According to the real-time temperature and pressure in the salt cavern cavity, the amount of natural gas that can be injected into the gas storage reservoir G is calculated in combination with the real gas state equation. r ;

[0021] According to the maximum operating pressure and maximum operating temperature of the salt cavern cavity, combined with the real gas state equation, the maximum gas storage capacity G of the salt cavern cavity is calculated. max ;

[0022] According to the minimum operating pressure and minimum operating temperature of the salt cavern cavity, combined with the real gas state equation, the minimum gas storage capacity G of the salt cavern cavity is calculated. min ;

[0023] The injectable and recoverable natural gas volumes of the salt cavern are calculated based on the real-time gas storage volume of the salt cavern, the maximum gas storage volume of the salt cavern and the minimum gas storage volume of the salt cavern.

[0024] The beneficial effect is that by calculating the injectable natural gas volume and the recoverable natural gas volume, it is convenient to determine the gas injection boundary conditions and the gas recovery boundary conditions.

[0025] In order to solve the above technical problems, the present invention also provides a device for determining the injection and production rate of a salt cavern gas storage, comprising:

[0026] The gas storage temperature and pressure analysis module is used to establish a physical model of the salt cavern gas storage and derive the distribution of temperature and pressure in the salt cavern cavity and the real-time average temperature and real-time average pressure in the salt cavern cavity based on the physical model;

[0027] The gas storage reservoir injection and production volume analysis module is used to deduce the injectable and recoverable natural gas volumes of the gas storage reservoir based on the real-time temperature and pressure of the gas storage reservoir;

[0028] A salt cavern gas storage gas storage gas storage volume injection and production boundary condition analysis module, which is used to set different gas injection boundary conditions according to the injectable natural gas volume of the salt cavern cavity, and simulate the distribution of temperature and pressure in the salt cavern cavity under different gas injection boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage under different gas injection boundary conditions and determining the gas injection boundary conditions that ensure the stability of the surrounding rock; and / or setting different gas production boundary conditions according to the recoverable natural gas volume of the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas production boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage under different gas production boundary conditions and determining the gas production boundary conditions that ensure the stability of the surrounding rock;

[0029] The salt cavern gas storage injection and production rate determination module is used to determine the gas injection rate according to the gas injection boundary conditions that can ensure the stability of the surrounding rock, and / or determine the gas production rate according to the gas production boundary conditions that can ensure the stability of the surrounding rock.

[0030] The beneficial effects are as follows: the device of the present invention can be used to establish a physical model of a salt cavern gas storage reservoir, thereby quickly and accurately simulating and calculating the distribution of temperature and pressure in the salt cavern cavity under different injection / production boundary conditions, analyzing the stability of the surrounding rock and then determining the injection and production boundary conditions of the gas storage reservoir that can ensure the stability of the surrounding rock, determining the injection and production rate according to the injection and production boundary conditions, avoiding the natural gas in the gas storage reservoir from being in a supercritical state, thereby ensuring the stability and reliability of the salt cavern gas storage reservoir.

[0031] Preferably, the method for establishing a physical model of a salt cavern gas storage by using the gas storage temperature and pressure analysis module comprises the following steps:

[0032] Obtain wellbore parameters, salt cavern cavity parameters and gas storage operation parameters;

[0033] Calculate the physical property parameters of natural gas within the preset temperature range and pressure range according to the gas database;

[0034] Based on the thermal-mechanical coupling model of the rock cavity, a physical model of the salt cavern gas storage is established according to the wellbore parameters, the salt cavern cavity parameters, the gas storage operation parameters and the physical property parameters.

[0035] To solve the above technical problems, the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the method for determining the injection and production rate of a salt cavern gas storage reservoir of the present invention is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the method steps of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of an underground salt cavern gas storage. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Example of method for determining injection and production rate of salt cavern gas storage:

[0040] like Figure 1 As shown, the method for determining the injection and production rate of a salt cavern gas storage of the present invention comprises the following steps:

[0041] 1) Obtain wellbore parameters, salt cavern cavity parameters and gas storage operation parameters;

[0042] like Figure 2 As shown, the underground salt cavern gas storage includes three parts: ground natural gas injection facilities, wellbore and salt cavern cavity. The wellbore includes completion string and injection and production string. The injection and production string is arranged inside the completion string. According to the completion design plan, the outer diameter of the completion string, the wall thickness of the completion string, the inner diameter of the completion string, the bottom depth of the completion string, the outer diameter of the injection and production gas string, the wall thickness of the injection and production gas string, the inner diameter of the injection and production gas string and the bottom depth of the injection and production gas string are obtained; the salt cavern cavity parameters can be obtained by using the sonar cavity measurement data, and the salt cavern cavity parameters include the shape of the salt cavern, the total volume of the salt cavern, the buried depth of the top of the salt cavern and the buried depth of the bottom of the salt cavern; the sonar data include the measurement point, well depth, cross-sectional radius, cross-sectional area, depth range, segmented volume and cumulative volume.

[0043] 2) Calculate the physical properties of natural gas within a preset temperature range and pressure range based on the gas database;

[0044] The physical property parameters include the compression factor Z, density D, thermal conductivity L, constant pressure heat capacity C and viscosity V of natural gas at different temperatures and pressures; the specified temperature range and pressure range can be imported into MATLAB, and these physical property parameters can be calculated using MATLAB. Natural gas includes a variety of gases. In this embodiment, carbon dioxide gas is used as an example to simulate the stability of the salt cavern cavity; when the temperature is i and the pressure is j, the calculation expressions of the compression factor Z, density D, thermal conductivity L, constant pressure heat capacity C and viscosity Q in MATLAB are:

[0045] Z(i,j)=py.FLUIDPROP.FLUIDPROP.PropsSI('Z','T',T(i),'P',P(j),'CO2')

[0046] D(i,j)=py.FLUIDPROP.FLUIDPROP.PropsSI('D','T',T(i),'P',P(j),'CO2')

[0047] L(i,j)=py.FLUIDPROP.FLUIDPROP.PropsSI('L','T',T(i),'P',P(j),'CO2')

[0048] C(i,j)=py.FLUIDPROP.FLUIDPROP.PropsSI('C','T',T(i),'P',P(j),'CO2')

[0049] Q(i,j)=py.FLUIDPROP.FLUIDPROP.PropsSI('V','T',T(i),'P',P(j),'CO2')

[0050] 3) Based on the thermal coupling model of the rock cavity, a physical model of the salt cavern gas storage is established according to the wellbore parameters, salt cavern cavity parameters, gas storage operation parameters, and physical properties of natural gas in a preset temperature range and pressure range, and the real-time average temperature and real-time average pressure in the salt cavern cavity are calculated according to the physical model;

[0051] The specific process of establishing the physical model of the salt cavern gas storage is as follows: first, a two-dimensional axisymmetric geometric model is established according to the stratum depth, stratum structure and sonar cavity shape of the underground salt cavern gas storage; then, the mechanical and thermophysical parameters of the rock and natural gas are set; the boundary conditions of the model are set, the upper part of the rock is subject to the pressure of the overlying rock strata, the side is supported by rollers, and movement is only allowed in the vertical direction, not in the horizontal direction, the bottom of the rock is a fixed constraint, and the boundary load at the cavity wall is the gas pressure, which is a variable boundary condition during the gas injection and production process; finally, the model is meshed according to the characteristics of the physical field; after setting the boundary conditions of the wellhead, the physical model of the salt cavern gas storage is established.

[0052] When establishing the physical model of the salt cavern gas storage, the physical property parameters of natural gas need to be imported into the thermal coupling model of the rock cavity. There are two ways to import the physical property parameters into the thermal coupling model of the rock cavity. The first is to use MATLAB. When the thermal coupling model requires physical property parameters under a certain temperature and pressure, MATLAB is called for calculation, and the physical property parameters are returned to the thermal coupling model; the second is to generate a database of physical property parameters of natural gas in the temperature range and pressure range, and import it into the thermal coupling model. Based on the physical property parameters of natural gas and the parameters of the salt cavern cavity, the physical model of the salt cavern gas storage is established in the thermal coupling model. After the physical model of the salt cavern gas storage is established, the gas injection and production boundary conditions are set, and the physical model is solved to obtain the real-time average temperature and real-time average pressure in the salt cavern cavity.

[0053] 4) Calculate the amount of natural gas that can be injected into the gas storage based on the real-time average temperature and real-time average pressure in the salt cavern cavity;

[0054] 4.1) Substitute the temperature and pressure in the salt cavern cavity and the physical properties of the natural gas at this pressure and temperature into the real gas state equation to calculate the real-time storage volume of natural gas under this state G r ;

[0055] The real gas state equation is:

[0056] PV=nZRT (1)

[0057] The following expression is obtained by transforming the real gas state:

[0058]

[0059] In the formula,

[0060] make Substituting into the above formula, we can get the following expression:

[0061]

[0062] In equations (1) to (3), P is the pressure of the gas; V is the gas volume, that is, the total volume of the salt cavern cavity; n is the amount of gas; Z is the gas compressibility factor; R is the universal gas constant; T is the temperature of the gas; M g is the relative molecular mass of natural gas; P r , T r , Z r , σ r They are the real-time pressure, temperature, compression factor and density in the salt cavern cavity.

[0063] 4.2) Calculate the maximum gas storage capacity G of the salt cavern cavity based on the maximum operating pressure and maximum operating temperature of the salt cavern cavity combined with the real gas state equation max ; According to the minimum operating pressure and minimum operating temperature of the salt cavern cavity combined with the real gas state equation, the minimum gas storage capacity G of the salt cavern cavity is calculated min .

[0064] According to the maximum operating pressure and maximum operating temperature of the salt cavern cavity, the deformed real gas state equation can be obtained:

[0065]

[0066] According to the minimum operating pressure and temperature of the salt cavern cavity, the deformed real gas state equation can be obtained:

[0067]

[0068] In formula (4) to formula (5), P max is the maximum operating pressure of the salt cavern; V is the total volume of the salt cavern; Mg is the relative molecular mass of natural gas; Z r is the real-time compression factor in the salt cavern cavity; R is the universal gas constant; T max is the maximum operating temperature of the salt cavern; ρ r It is the real-time density in the salt cavern cavity.

[0069] 4.3) According to the real-time gas storage capacity of the salt cavern cavity, the maximum gas storage capacity of the salt cavern cavity and the minimum gas storage capacity of the salt cavern cavity, the injectable natural gas volume and the recoverable natural gas volume of the salt cavern cavity are calculated. When injecting gas, the injectable natural gas volume in the salt cavern cavity is expressed as:

[0070] G in =G max -G r (6)

[0071] When gas is produced, the expression of the recoverable natural gas volume in the salt cavern cavity is:

[0072] G out =G r -G min (7)

[0073] In formula (6) to formula (7), G in is the amount of natural gas that can be injected; G max is the maximum gas storage capacity of the salt cavern; G r is the real-time gas storage capacity of the salt cavern cavity; G out is the recoverable natural gas volume; G min It is the minimum gas storage capacity of the salt cavern cavity.

[0074] 5) According to the injectable and recoverable natural gas volumes in the salt cavern cavity, different gas injection boundary conditions and gas production boundary conditions are set, and the temperature and pressure distribution in the gas storage reservoir under different gas injection boundary conditions and gas production boundary conditions are simulated based on the theoretical model, so as to analyze the stability of the surrounding rock of the gas storage reservoir under different injection and production conditions and determine the gas injection and production boundary conditions that ensure the stability of the surrounding rock.

[0075] Under different gas injection boundary conditions or different gas production boundary conditions, the temperature and pressure changes in the cavity and the gas velocity are different, and the temperature and pressure distribution in the gas storage is not uniform. Too fast gas injection or gas production rate will cause the temperature in the gas storage to change too quickly, and too fast temperature and pressure changes in the cavity will also affect the physical properties of natural gas. Different gas injection boundary conditions and gas production boundary conditions are set to simulate the distribution of temperature and pressure in the gas storage, and then the stability of the surrounding rock is analyzed according to the distribution of temperature and pressure in the gas storage and the thermal parameters of natural gas.

[0076] 6) The maximum value of the rate of change of gas storage capacity in the salt cavern gas storage is derived based on the gas injection and production boundary conditions; the rate of change of gas storage capacity in the gas storage refers to the natural gas injection rate or gas production rate.

[0077] The method of the present invention can quickly and accurately simulate and calculate the distribution of temperature and pressure in the salt cavern cavity under different injection / production boundary conditions, the amount of injectable natural gas, the amount of recoverable natural gas, and then analyze the stability of the surrounding rock and the boundary conditions of the change of the gas storage volume of the gas storage, and then deduce the maximum value of the rate of change of the gas storage volume of the salt cavern gas storage, so as to avoid the gas in the salt cavern cavity being in a supercritical state, make the temperature distribution and pressure distribution of the internal space of the gas storage more uniform, and thus ensure the stability and reliability of the salt cavern gas storage.

[0078] Salt cavern gas storage injection and production rate determination device embodiment:

[0079] The device for determining the injection and production rate of a salt cavern gas storage reservoir of the present invention comprises:

[0080] The gas storage temperature and pressure analysis module is used to establish a physical model of the salt cavern gas storage and derive the distribution of temperature and pressure in the salt cavern cavity and the real-time average temperature and real-time average pressure in the salt cavern cavity based on the physical model;

[0081] The gas storage injection and production analysis module is used to deduce the injectable and recoverable natural gas volumes of the gas storage based on the real-time average temperature and real-time average pressure in the salt cavern cavity;

[0082] A gas storage reservoir gas storage volume injection and production boundary condition analysis module is used to set different gas injection boundary conditions according to the injectable natural gas volume of the salt cavern cavity, and simulate the distribution of temperature and pressure in the salt cavern cavity under different gas injection boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas injection boundary conditions and determining the gas injection boundary conditions that ensure the stability of the surrounding rock; and / or setting different gas production boundary conditions according to the recoverable natural gas volume of the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas production boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas production boundary conditions and determining the gas production boundary conditions that ensure the stability of the surrounding rock;

[0083] The injection and production rate determination module of the salt cavern gas storage is used to determine the injection rate according to the gas injection boundary conditions that can ensure the stability of the surrounding rock, and / or determine the gas production rate according to the gas production boundary conditions that can ensure the stability of the surrounding rock.

[0084] The technical effects of the device for determining the injection and production rate of a salt cavern gas storage reservoir of the present invention and the method for establishing a physical model of a salt cavern gas storage reservoir by a gas storage reservoir temperature and pressure analysis module have been described in the embodiment of the method for determining the injection and production rate of a salt cavern gas storage reservoir, and will not be repeated here.

[0085] Electronic device embodiment:

[0086] The electronic device of the present invention comprises a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the method for determining the injection and production rate of a salt cavern gas storage of the present invention is implemented. The method for determining the injection and production rate of a salt cavern gas storage of the present invention and the technical effects have been described in the embodiment of the method for determining the injection and production rate of a salt cavern gas storage, and will not be repeated here.

[0087] The processor may be a microprocessor MCU, a programmable logic device FPGA or other processing device.

[0088] The memory can be any type of memory that uses electrical energy to store information.

Claims

1. A method for determining the injection and production rate of a salt cavern gas storage, characterized in that: The following steps are involved: 1) Establishing a physical model of the salt cavern gas storage reservoir, and deriving the real-time temperature and real-time pressure of the gas storage reservoir according to the physical model; the physical model is used to simulate the distribution of temperature and pressure in the salt cavern cavity under different injection / production boundary conditions and the real-time average temperature and real-time average pressure in the salt cavern cavity; 2) Based on the real-time average temperature and real-time average pressure in the salt cavern cavity and the physical properties of natural gas, the injectable and recoverable natural gas volumes of the gas storage reservoir are derived; 3) setting different gas injection boundary conditions according to the amount of natural gas that can be injected into the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas injection boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas injection boundary conditions and determining the gas injection boundary conditions that can ensure the stability of the surrounding rock; And / or setting different gas extraction boundary conditions according to the recoverable natural gas volume of the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas extraction boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas extraction boundary conditions, and determining the gas extraction boundary conditions that can ensure the stability of the surrounding rock; 4) Determine the gas injection rate according to the gas injection boundary conditions that can ensure the stability of the surrounding rock, and / or determine the gas production rate according to the gas production boundary conditions that can ensure the stability of the surrounding rock.

2. The method for determining the injection and production rate of a salt cavern gas storage according to claim 1, characterized in that: The method for establishing a physical model of a salt cavern gas storage comprises the following steps: Obtain wellbore parameters, salt cavern cavity parameters and gas storage operation parameters; Calculate the physical property parameters of natural gas within the preset temperature range and pressure range according to the gas database; Based on the thermal-mechanical coupling model of the rock cavity, a physical model of the salt cavern gas storage is established according to the wellbore parameters, the salt cavern cavity parameters, the gas storage operation parameters and the physical property parameters.

3. The method for determining the injection and production rate of a salt cavern gas storage as claimed in claim 2, characterized in that: The wellbore parameters include the outer diameter of the completion string, the wall thickness of the completion string, the inner diameter of the completion string, the bottom depth of the completion string, the outer diameter of the injection and production gas string, the wall thickness of the injection and production gas string, the inner diameter of the injection and production gas string and the bottom depth of the injection and production gas string; the salt cavern cavity parameters include the shape of the salt cavern, the total volume of the salt cavern, the burial depth of the top of the salt cavern and the burial depth of the bottom of the salt cavern.

4. The method for determining the injection and production rate of a salt cavern gas storage according to claim 2, characterized in that: The salt cavern cavity parameters are derived through sonar cavity measurement data.

5. The method for determining the injection and production rate of a salt cavern gas storage according to claim 4, characterized in that: The sonar cavity measurement data include measurement point, well depth, cross-sectional radius, cross-sectional area, depth range, segmented volume and cumulative volume.

6. The method for determining the injection and production rate of a salt cavern gas storage according to claim 2, characterized in that: The physical property parameters include compression factor, density, thermal conductivity, constant pressure heat capacity and viscosity.

7. The method for determining the injection and production rate of a salt cavern gas storage according to any one of claims 1 to 6, characterized in that: The method for deriving the amount of natural gas that can be injected into a gas storage facility includes the following steps: According to the real-time temperature and pressure in the salt cavern cavity, the amount of natural gas that can be injected into the gas storage reservoir G is calculated in combination with the real gas state equation. r ; According to the maximum operating pressure and maximum operating temperature of the salt cavern cavity, combined with the real gas state equation, the maximum gas storage capacity G of the salt cavern cavity is calculated. max ; According to the minimum operating pressure and minimum operating temperature of the salt cavern cavity, combined with the real gas state equation, the minimum gas storage capacity G of the salt cavern cavity is calculated. min ; The injectable and recoverable natural gas volumes of the salt cavern are calculated based on the real-time gas storage volume of the salt cavern, the maximum gas storage volume of the salt cavern and the minimum gas storage volume of the salt cavern.

8. A device for determining the injection and production rate of a salt cavern gas storage, characterized in that: include: The gas storage temperature and pressure analysis module is used to establish a physical model of the salt cavern gas storage and derive the distribution of temperature and pressure in the salt cavern cavity and the real-time average temperature and real-time average pressure in the salt cavern cavity based on the physical model; The gas storage injection and production analysis module is used to deduce the injectable and recoverable natural gas volumes of the gas storage based on the real-time average temperature and real-time average pressure in the salt cavern cavity; The gas storage reservoir injection and production boundary condition analysis module is used to set different gas injection boundary conditions according to the amount of natural gas that can be injected into the salt cavern cavity, and simulate the distribution of temperature and pressure in the salt cavern cavity under different gas injection boundary conditions based on the physical model, so as to analyze the stability of the surrounding rock of the gas storage reservoir under different gas injection boundary conditions and determine the gas injection boundary conditions that ensure the stability of the surrounding rock; And / or setting different gas extraction boundary conditions according to the recoverable natural gas volume of the salt cavern cavity, and simulating the distribution of temperature and pressure in the salt cavern cavity under different gas extraction boundary conditions based on the physical model, thereby analyzing the stability of the surrounding rock of the gas storage reservoir under different gas extraction boundary conditions, and determining the gas extraction boundary conditions that ensure the stability of the surrounding rock; The gas storage injection and production rate determination module is used to derive the maximum value of the salt cavern gas storage gas storage gas storage capacity change rate according to the gas storage capacity change boundary conditions; the gas storage capacity change boundary conditions refer to the gas injection boundary conditions or the gas production boundary conditions; the gas storage capacity change rate refers to the natural gas injection rate or the gas production rate.

9. The device for determining the injection and production rate of a salt cavern gas storage according to claim 8, characterized in that: The method for establishing a physical model of a salt cavern gas storage reservoir by using a gas storage reservoir temperature and pressure analysis module comprises the following steps: Obtain wellbore parameters, salt cavern cavity parameters and gas storage operation parameters; Calculate the physical property parameters of natural gas within the preset temperature range and pressure range according to the gas database; Based on the thermal-mechanical coupling model of the rock cavity, a physical model of the salt cavern gas storage is established according to the wellbore parameters, the salt cavern cavity parameters, the gas storage operation parameters and the physical property parameters.

10. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the method for determining the injection and production rate of a salt cavern gas storage according to any one of claims 1 to 7 is implemented.

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