Method for rapidly evaluating capacity of gas storage reservoir in constant pressure water body

Abstract

This invention provides a method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body. The method includes: Step 1, calculating the effective trap size and pressurization coefficient based on a geological assessment of the effective trap; Step 2, calculating the available gas storage capacity from gas injection and water displacement based on the assessment results of the effective trap size; Step 3, calculating the available gas storage capacity from gas injection and compression of rock and residual water based on the assessment results of the effective trap pressurization coefficient; and Step 4, calculating the storage capacity of the gas storage facility converted from the constant-pressure water body. This method provides highly accurate calculation results for the gas storage capacity of such facilities, enabling rapid evaluation and providing an accurate capacity calculation method for the preliminary evaluation of gas storage facilities converted from constant-pressure water bodies.

Description

Technical Field

[0001] This invention relates to the field of underground natural gas storage technology using groundwater bodies, and in particular to a method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body. Background Technology

[0002] Underground gas storage facilities are an effective means of seasonal peak shaving, emergency peak shaving, and strategic energy reserves. Utilizing groundwater bodies to renovate gas storage facilities can effectively break the limitation of gas storage construction revolving around oil and gas producing areas, allowing for construction near high-consumption natural gas regions. Storage capacity is a crucial indicator of gas storage performance, and how to evaluate the storage capacity of favorable water-bearing traps selected by geologists remains a technical challenge for researchers.

[0003] Chinese patent application CN201710168164.9 discloses a method for determining the capacity of a gas storage facility, comprising the following steps: establishing a formation pressure model based on the real-time radius of the gas layer in the gas storage facility; establishing a bottomhole flowing pressure model based on the effective permeability of the gas storage facility and the gas layer skin coefficient; establishing a wellhead oil pressure model and a gas injection model for the gas storage facility based on the formation pressure model and the bottomhole flowing pressure model; and determining the capacity of the gas storage facility based on the wellhead oil pressure model and the gas injection model.

[0004] Chinese patent application CN202110136608.7 discloses a method for determining the effective pore volume in calculating the capacity of an oil reservoir-type gas storage facility. The method includes the following steps: S1, fabricating a two-dimensional large-scale planar rock slab model and measuring its permeability; S2, filling the planar rock slab and saturating it with experimental fluid to establish bound water saturation; S3, conducting multiple rounds of gas injection and production experiments using a two-dimensional sand-filled model; S4, applying the planar radial flow formula to perform calculations, analyzing the changes in production capacity during the experiment, and optimizing the calculation and analysis model; S5, calculating the oil saturation based on the degree of recovery, and constructing a relative permeability curve based on the calculated effective permeability.

[0005] Chinese patent application CN201410636368.7 discloses a method and apparatus for obtaining the storage capacity of a gas storage facility converted from a water-flooded gas reservoir. The method includes: obtaining the relationship between the gas-water interface of the gas storage facility and reservoir pressure; dividing the pore volume occupied by the dynamic gas reserves of the gas storage facility into three gas storage fluid regions: a gas region, a gas-water interaction region, and a water region, based on the relationship, and calculating the pore volume contribution of each gas storage fluid region to the dynamic gas reserves; deducting the pore volume within each gas storage fluid region that cannot be used for gas storage based on the pore volume contribution of each gas storage fluid region to the dynamic gas reserves; and calculating the storage capacity of the gas storage facility based on the deduction of the pore volume within each gas storage fluid region that cannot be used for gas storage.

[0006] The existing technologies described above are significantly different from the present invention and have failed to solve the technical problem we want to address. Therefore, we have invented a new method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body. Summary of the Invention

[0007] The purpose of this invention is to provide a method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body, which can obtain a more accurate estimate of the storage capacity.

[0008] The objective of this invention can be achieved through the following technical measures: a method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body, the method comprising:

[0009] Step 1: Calculate the size of the effective trap water body and the pressurization coefficient based on the geological evaluation of the effective trap.

[0010] Step 2: Based on the evaluation results of the effective confined water body size, calculate the gas storage capacity that can be obtained from the gas injection and drainage of the water body.

[0011] Step 3: Based on the evaluation results of the effective trap pressurization coefficient, calculate the gas storage capacity that can be obtained by injecting gas to compress the rock and residual water;

[0012] Step 4: Calculate the storage capacity of the gas storage facility converted from a constant-pressure water body.

[0013] The objective of this invention can also be achieved through the following technical measures:

[0014] In step 1, the formula for calculating the effective size of the trapped water body is:

[0015]

[0016] in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

[0017] In step 1, the formula for calculating the effective trap boost coefficient is:

[0018] ,

[0019] in, The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

[0020] In step 2, the formula for calculating the gas storage capacity obtainable by injecting gas and discharging water is as follows:

[0021] ,

[0022] in, This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The average gas saturation of the effective trap after gas injection; This represents the volume coefficient of the injected gas.

[0023] In step 3, the formula for calculating the gas storage capacity obtainable by injecting gas to compress the rock is as follows:

[0024] ,

[0025] in, This refers to the gas storage capacity obtainable by compressing rock with gas, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient;

[0026] The original formation pressure is expressed in MPa. This represents the volume coefficient of the injected gas.

[0027] In step 4, the gas storage capacity of the gas storage tank that can be obtained by injecting gas and displacing water is calculated based on the calculation results of the gas storage capacity that can be obtained by injecting gas to compress rocks and residual water is calculated in step 3.

[0028] In step 4, the formula for calculating the storage capacity of the gas storage facility converted from a constant-pressure water body is as follows:

[0029] ,

[0030] in, The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility that can be obtained by injecting gas to compress rock and residual water is expressed in units of 10. 4 m 3 .

[0031] The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body also includes, before step 1, designing a fluid seepage test based on the characteristics of the constant-pressure water body gas storage facility, measuring the gas saturation after multiple rounds of gas injection through the test, and measuring the compressibility coefficients of the rock and water body through the fluid test.

[0032] In the step of measuring the compressibility coefficients of rocks and water, multiple rounds of gas-driven water experiments are conducted to describe the physical process of gas injection and water displacement and the impact of multiple rounds of displacement on the compression of rocks and residual water, thereby obtaining the gas saturation of gas-driven water, the rock compressibility coefficient, and the water compressibility coefficient.

[0033] The method for rapidly evaluating the storage capacity of a converted gas storage facility in a constant-pressure water body, as described in this invention, is characterized by obtaining the effective trap size and pressurization coefficient of the effective trap based on geological assessment; calculating the storage capacity obtainable by injecting gas and displacing formation water based on the effective trap size; calculating the storage capacity obtainable by injecting gas and compressing rock and residual water based on the pressurization coefficient; and calculating the storage capacity of the converted gas storage facility in a constant-pressure water body based on the storage capacity obtainable by injecting gas, displacing water, and compressing rock and residual water. This invention provides highly accurate calculation results, enabling rapid evaluation of the storage capacity of converted gas storage facilities in constant-pressure water bodies, and providing an accurate storage capacity calculation method for the preliminary evaluation of such facilities.

[0034] Compared with other methods, this invention has the advantages of requiring fewer parameters, fast calculation speed, and accurate evaluation results, and solves the problem that the storage capacity cannot be accurately evaluated in the early screening process of converting water-bearing closed gas storage facilities. Attached Figure Description

[0035] Figure 1 A flowchart of a specific embodiment of the method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to the present invention;

[0036] Figure 2 This is a schematic diagram of the effective burial depth and overflow point depth in a specific embodiment of the present invention. Detailed Implementation

[0037] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0039] like Figure 1 As shown, Figure 1 This is a flowchart illustrating the method for rapidly evaluating the storage capacity of a converted gas storage facility in a constant-pressure water body, as per the present invention. The method for rapidly evaluating the storage capacity of a converted gas storage facility in a constant-pressure water body includes:

[0040] Step 1: Based on the geological evaluation of the effective trap, obtain the effective trap water volume size and pressurization coefficient; the method for obtaining the effective trap water volume size is as follows:

[0041] The effective size of the trapped water body is based on the formula. ,

[0042] in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

[0043] The effective closed-loop boost coefficient is based on the formula. in,

[0044] The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

[0045] Step 2: Based on the evaluation results of the effective trapped water body size, obtain the gas storage capacity that can be obtained from the gas injection and drainage water body.

[0046] The methods for obtaining gas storage capacity by injecting gas and draining water are as follows:

[0047] According to the formula in,

[0048] The gas storage capacity that can be obtained by gas injection and water drainage is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m3 ; The average gas saturation of the effective trap after gas injection; This represents the volume coefficient of the injected gas.

[0049] Step 3: Based on the evaluation results of the effective trap pressurization coefficient, obtain the gas storage capacity that can be obtained from the gas injection compression rock and residual water;

[0050] The method for obtaining the gas storage capacity that can be obtained from gas-injected compressed rock and residual water is as follows:

[0051] According to the formula in,

[0052] This refers to the gas storage capacity obtainable by compressing rock with gas, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient; The original formation pressure is expressed in MPa. This represents the volume coefficient of the injected gas.

[0053] Step 4: Based on the calculation results of the gas storage capacity that can be obtained from the gas injection and drainage water body and the gas storage capacity that can be obtained from the gas injection and compression of rock and residual water, obtain the gas storage capacity of the constant pressure water body to be converted into a gas storage tank.

[0054] The method for obtaining the storage capacity of a gas storage facility converted from a constant-pressure water body is as follows:

[0055] According to the formula in,

[0056] The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility that can be obtained by injecting gas to compress rock and residual water is expressed in units of 10. 4 m 3 .

[0057] The following are several specific embodiments of the application of the present invention.

[0058] Example 1

[0059] In a specific embodiment 1 of the present invention, the following steps are included:

[0060] Step S001: Based on the geological evaluation of the effective trap, obtain the scale of the effective trap water body.

[0061] refer to Figure 2 As shown, the effective trapped water body size is obtained according to the formula. in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

[0062] To obtain the effective closed-loop boost coefficient, use the formula... in,

[0063] The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

[0064] Step S002: Based on the evaluation results of the effective trapped water body size, obtain the gas storage capacity that can be obtained from the gas injection and drainage water body.

[0065] According to the formula ,in,

[0066] The gas storage capacity that can be obtained by gas injection and water drainage is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The average gas saturation of the effective trap after gas injection; This represents the volume coefficient of the injected gas.

[0067] Step S003: Based on the results of the effective trap pressurization coefficient of the geological evaluation, obtain the gas storage capacity that can be obtained by compressing the rock and residual water.

[0068] According to the formula in, This refers to the gas storage capacity obtainable by compressing rock with gas, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient; The original formation pressure is expressed in MPa. This represents the volume coefficient of the injected gas.

[0069] Step S004: Based on the calculation results of obtaining the gas storage capacity that can be obtained by gas injection and water discharge and obtaining the gas storage capacity that can be obtained by gas injection, compression of rocks and residual water, obtain the gas storage capacity of the constant pressure water body conversion gas storage.

[0070] According to the formula ,in,

[0071] The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility that can be obtained by injecting gas to compress rock and residual water is expressed in units of 10. 4 m 3 .

[0072] In this embodiment of the invention, Sg, Cw, and Ct can be obtained in the following ways:

[0073] Based on the characteristics of a constant-pressure water-based gas storage tank, a fluid seepage test was designed. The gas saturation after multiple injection cycles was measured through the test, and the compressibility coefficients of the rock and water were determined through fluid analysis. The specific method is as follows:

[0074] Multiple rounds of gas-driven water displacement experiments were conducted to describe the physical process of gas injection and the impact of multiple displacement rounds on the compressibility of rock and residual water. The gas saturation, rock compressibility, and water compressibility of the gas-driven water were obtained.

[0075] Example 2

[0076] In a specific embodiment 2 of the present invention, the geological assessment selected a trapped water body volume of 1×10⁻⁶. 8 The trap is buried at a depth of 1000m, with a closure height of 100m, an original formation pressure of 10MPa, a gas saturation of 70%, and a water compressibility coefficient of 4.75×10⁻⁶. -5 The rock compressibility coefficient is 6.08 × 10⁻⁶. -5 The volume factor of the injected gas is 6.6 × 10⁻⁶.-3 It includes the following steps:

[0077] Step 1: Based on the geological evaluation of the effective trap, obtain the effective trap water volume size and pressurization coefficient; the method for obtaining the effective trap water volume size is as follows:

[0078] The effective size of the trapped water body is based on the formula.

[0079] in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

[0080] The effective closed-loop boost coefficient is based on the formula. in,

[0081] The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

[0082] Step 2: Based on the evaluation results of the effective trapped water body size, obtain the gas storage capacity that can be obtained from the gas injection and drainage water body.

[0083] The methods for obtaining gas storage capacity by injecting gas and draining water are as follows:

[0084] According to the formula ,in,

[0085] The gas storage capacity that can be obtained by gas injection and water drainage is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The average gas saturation of the effective trap after gas injection; This represents the volume coefficient of the injected gas.

[0086] Step 3: Based on the evaluation results of the effective trap pressurization coefficient, obtain the gas storage capacity that can be obtained from the gas injection compression rock and residual water;

[0087] The method for obtaining the gas storage capacity that can be obtained from gas-injected compressed rock and residual water is as follows:

[0088] According to the formula in,

[0089] This refers to the gas storage capacity obtainable by compressing rock with gas, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient; The original formation pressure is expressed in MPa. This represents the volume coefficient of the injected gas.

[0090] Step 4: Based on the calculation results of the gas storage capacity that can be obtained from the gas injection and drainage water body and the gas storage capacity that can be obtained from the gas injection and compression of rock and residual water, obtain the gas storage capacity of the constant pressure water body to be converted into a gas storage tank.

[0091] The method for obtaining the storage capacity of a gas storage facility converted from a constant-pressure water body is as follows:

[0092] According to the formula ,in,

[0093] The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility that can be obtained by injecting gas to compress rock and residual water is expressed in units of 10. 4 m 3 .

[0094] The method for obtaining the storage capacity of a gas storage facility converted from a fixed-volume water body is as follows:

[0095] According to the formula The calculated rechargeable reservoir capacity after modifying the aquifer is 106.06 × 10⁶. 8 .

[0096] Example 3

[0097] In a specific embodiment 2 of the present invention, the geological assessment selected a trapped water body volume of 1×10⁻⁶. 8 The trap is buried at a depth of 1000m, with a closure height of 100m, an original formation pressure of 10MPa, a gas saturation of 70%, and a water compressibility coefficient of 4.75×10⁻⁶. -5The rock compressibility coefficient is 6.08 × 10⁻⁶. -5 The volume factor of the injected gas is 6.6 × 10⁻⁶. -3 It includes the following steps:

[0098] In a specific embodiment 2 of the present invention, the geological assessment selected a trapped water body volume of 5 × 10⁻⁶. 8 The trap is buried at a depth of 1000m, with a closure height of 500m, an original formation pressure of 10MPa, a gas saturation of 70%, and a water compressibility coefficient of 4.75×10⁻⁶. -5 The rock compressibility coefficient is 6.08 × 10⁻⁶. -5 The volume factor of the injected gas is 6.6 × 10⁻⁶. -3 It includes the following steps:

[0099] Step 1: Based on the geological evaluation of the effective trap, obtain the effective trap water volume size and pressurization coefficient; the method for obtaining the effective trap water volume size is as follows:

[0100] The effective size of the trapped water body is based on the formula.

[0101] in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

[0102] The effective closed-loop boost coefficient is based on the formula. in,

[0103] The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

[0104] Step 2: Based on the evaluation results of the effective trapped water body size, obtain the gas storage capacity that can be obtained from the gas injection and drainage water body.

[0105] The methods for obtaining gas storage capacity by injecting gas and draining water are as follows:

[0106] According to the formula ,in,

[0107] The gas storage capacity that can be obtained by gas injection and water drainage is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The average gas saturation of the effective trap after gas injection; This represents the volume coefficient of the injected gas.

[0108] Step 3: Based on the evaluation results of the effective trap pressurization coefficient, obtain the gas storage capacity that can be obtained from the gas injection compression rock and residual water;

[0109] The method for obtaining the gas storage capacity that can be obtained from gas-injected compressed rock and residual water is as follows:

[0110] According to the formula in,

[0111] This refers to the gas storage capacity obtainable by compressing rock with gas, expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient; The original formation pressure is expressed in MPa. This represents the volume coefficient of the injected gas.

[0112] Step 4: Based on the calculation results of the gas storage capacity that can be obtained from the gas injection and drainage water body and the gas storage capacity that can be obtained from the gas injection and compression of rock and residual water, obtain the gas storage capacity of the constant pressure water body to be converted into a gas storage tank.

[0113] The method for obtaining the storage capacity of a gas storage facility converted from a constant-pressure water body is as follows:

[0114] According to the formula ,in,

[0115] The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; This refers to the available gas storage capacity that can be obtained by injecting gas and discharging water, expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility that can be obtained by injecting gas to compress rock and residual water is expressed in units of 10. 4 m 3 .

[0116] The method for obtaining the storage capacity of a gas storage facility converted from a fixed-volume water body is as follows:

[0117] According to the formula The calculated rechargeable reservoir capacity after modifying the aquifer is 530.31 × 10⁻⁶. 8 .

[0118] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0119] Except for the technical features in the instruction manual, all of these are technologies known to those skilled in the art.

Claims

1. A method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body, characterized in that, The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body includes: Step 1: Calculate the size of the effective trap water body and the pressurization coefficient based on the geological evaluation of the effective trap. Step 2: Based on the evaluation results of the effective confined water body size, calculate the gas storage capacity obtained by injecting gas and discharging water. Step 3: Based on the evaluation results of the effective trap pressurization coefficient, calculate the gas storage capacity obtained by injecting gas to compress the rock and residual water; Step 4: Calculate the storage capacity of the gas storage facility converted from a constant-pressure water body; In step 2, the formula for calculating the gas storage capacity obtained by injecting gas and displacing water is as follows: in, The storage capacity of the gas storage facility obtained by injecting gas and discharging water is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The average gas saturation of the effective trap after gas injection; The volume coefficient of the injected gas; In step 3, the formula for calculating the gas storage capacity obtained by injecting gas to compress the rock is as follows: ， in, The storage capacity of the gas storage facility obtained by injecting gas into compressed rock is expressed in units of 10. 4 m 3 ; The water body size is expressed in units of 10. 4 m 3 ; The residual water compressibility coefficient of the reservoir; The compressibility coefficient of the reservoir rock; The average gas saturation of the effective trap after gas injection; The effective closed-loop boost coefficient; The original formation pressure is expressed in MPa. The volume coefficient of the injected gas; In step 4, the formula for calculating the storage capacity of the gas storage facility converted from a constant-pressure water body is as follows: in, The storage capacity of the gas storage facility is converted from a constant-pressure water body, in units of 10. 4 m 3 ; The storage capacity of the gas storage facility obtained by injecting gas and discharging water is expressed in units of 10. 4 m 3 ; The storage capacity of the gas storage facility is obtained by injecting gas to compress rock and residual water, in units of 10. 4 m 3 .

2. The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to claim 1, characterized in that, In step 1, the formula for calculating the effective size of the trapped water body is: in, The water body size is expressed in units of 10. 4 m 3 ; Effective enclosed area, in km² 2 ; The effective average thickness of the closed loop is expressed in meters (m). To effectively close the average effective porosity.

3. The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to claim 1, characterized in that, In step 1, the formula for calculating the effective trap boost coefficient is: ， in, The effective closed-loop boost coefficient; The effective depth of the overflow point is measured in meters. The effective burial depth is indicated in meters (m).

4. The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to claim 1, characterized in that, In step 4, the storage capacity of the gas storage tank obtained by injecting gas and displacing water as calculated in step 2 and the storage capacity of the gas storage tank obtained by injecting gas, compressing rock and residual water as calculated in step 3 are used to calculate the storage capacity of the gas storage tank converted from the constant pressure water body.

5. The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to claim 1, characterized in that, The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body also includes, before step 1, designing a fluid seepage test based on the characteristics of the constant-pressure water body gas storage facility, measuring the gas saturation after multiple rounds of gas injection through the test, and measuring the compressibility coefficients of the rock and water body through the fluid test.

6. The method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body according to claim 5, characterized in that, In the step of measuring the compressibility coefficients of rocks and water, multiple rounds of gas-driven water experiments are conducted to describe the physical process of gas injection and water displacement and the impact of multiple rounds of displacement on the compression of rocks and residual water, thereby obtaining the gas saturation of gas-driven water, the rock compressibility coefficient, and the water compressibility coefficient.

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