Sealing Structure at the Connection between Underground Gas Storage and Pipeline and Method for Determining Its Parameters

Abstract

The present invention belongs to the technical field of underground gas storage seals, and specifically discloses a sealing structure for the connection part between an underground gas storage and a pipeline and a method for determining its parameters. The sealing structure is wrapped around the outer wall of the pipeline, and one end of the sealing structure extends into the plugging body of the underground gas storage. The sealing structure includes an elastic outer shell and a shock absorber. The elastic outer shell is hermetically connected to the outer wall of the pipeline, and there is a cavity between the elastic outer shell and the pipeline. The shock absorber is arranged in the cavity, and self-adhesive layers are arranged between the shock absorber and the elastic outer shell and between the shock absorber and the pipeline. The sealing structure of the present invention can effectively ensure the sealing performance of the connection part between the underground gas storage and the pipeline when the gas state changes sharply during the gas charging and discharging process of the underground gas storage, and has multiple advantages such as adapting to environmental pressure and temperature changes, high-efficiency shock absorption, and stable sealing, ensuring the long-term safe and effective operation of the underground gas storage.

Description

Technical Field

[0001] The invention discloses a sealing structure of a connection part between an underground gas storage reservoir and a pipeline and a parameter determination method thereof, belonging to the technical field of underground gas storage reservoir sealing. Background Art

[0002] As a key infrastructure, underground gas storage is responsible for balancing energy supply and demand and ensuring the stability of energy supply. Traditionally, the sealing methods used in the connection between underground gas storage and pipelines are mainly based on conventional rubber sealing rings, simple flange connections and ordinary sealing gaskets. Under normal working conditions, this type of method can still maintain basic sealing requirements, but it is difficult to ensure sealing when faced with temperature changes, pressure changes and other problems derived from the rapid changes in the gas state during the filling and degassing process of the underground gas storage. Summary of the invention

[0003] The purpose of the present invention is to provide a sealing structure for the connection between an underground gas storage reservoir and a pipeline and a method for determining its parameters, so as to solve the technical problem that the sealing method in the prior art is difficult to ensure the sealing performance of the underground gas storage reservoir during the filling and deflation process.

[0004] A first aspect of the present invention provides a sealing structure for the connection portion between an underground gas storage reservoir and a pipeline, wherein the sealing structure is coated on the outer wall of the pipeline, and one end of the sealing structure extends into a blocking body of the underground gas storage reservoir; the sealing structure comprises an elastic shell and a shock-absorbing body; the elastic shell is sealingly connected to the outer wall of the pipeline, and a cavity is provided between the elastic shell and the pipeline; the shock-absorbing body is arranged in the cavity, and a self-adhesive layer is provided between the shock-absorbing body and the elastic shell and between the shock-absorbing body and the pipeline.

[0005] Preferably, the elastic shell is made of memory alloy.

[0006] Preferably, the sealing structure is in a capsule shape.

[0007] Preferably, the length of one end of the sealing structure extending into the sealing body of the underground gas storage is greater than or equal to 100 mm.

[0008] The second aspect of the present invention provides a method for determining parameters of a sealing structure for a connection portion between an underground gas storage reservoir and a pipeline as described above, wherein the parameters include the thickness of an elastic shell. The method for determining the thickness of the elastic shell includes: determining safety parameters corresponding to the material used to make the elastic shell; and determining the thickness of the elastic shell based on the diameter of the pipeline, the external pressure during operation of the underground gas storage reservoir, and the safety parameters.

[0009] Preferably, the safety parameters include yield strength and safety factor, and the thickness of the elastic shell is determined according to the diameter of the pipeline, the external pressure when the underground gas storage reservoir is in operation, and the safety parameters, specifically including: determining the actual bearing capacity of the elastic shell according to the product of the external pressure when the underground gas storage reservoir is in operation and the safety factor; determining the bearing capacity margin of the elastic shell according to the difference between the yield strength and the actual bearing capacity; determining the thickness of the elastic shell according to the quotient of the actual bearing capacity and the bearing capacity margin and the diameter of the pipeline.

[0010] Preferably, the parameters also include the thickness of the shock absorber, and the method for determining the thickness of the shock absorber includes: obtaining the mechanical parameters of the shock absorber and a preset target vibration isolation rate; determining the thickness of the shock absorber according to the operating frequency of the pipeline, the mechanical parameters and the target vibration isolation rate.

[0011] Preferably, the mechanical parameters include an elastic modulus and a damping ratio, and the thickness of the shock absorber is determined according to the operating frequency of the pipeline, the mechanical parameters and the target vibration isolation rate, specifically including: determining the vibration isolation amount according to the target vibration isolation rate; determining the vibration amount according to the elastic modulus, the damping ratio and the operating frequency; determining the thickness of the shock absorber according to the quotient of the vibration isolation amount and the vibration amount.

[0012] Preferably, the parameters also include the thickness of the self-adhesive layer, and the method for determining the thickness of the self-adhesive layer includes: obtaining the bonding strength, roughness and shear modulus of the self-adhesive used in the self-adhesive layer, wherein the roughness is determined according to the roughness value of the adhesives on both sides of the self-adhesive layer; determining the product of the bonding strength and the roughness, recorded as a first numerical value; and determining the thickness of the self-adhesive layer according to the quotient of the first numerical value and the shear modulus.

[0013] Preferably, the parameters also include the extension length of the sealing structure outside the sealing body of the underground gas storage, and the method for determining the extension length includes: obtaining the vibration amplitude of the pipeline and the deformation of the elastic shell; and determining the extension length according to the quotient of the vibration amplitude and the deformation.

[0014] Compared with the prior art, the sealing structure of the underground gas storage and pipeline connection part and the parameter determination method thereof of the present invention have the following beneficial effects:

[0015] The sealing structure of the present invention can effectively ensure the sealing of the connection between the underground gas storage and the pipeline when the gas state changes dramatically during the filling and degassing process of the underground gas storage. It has multiple advantages such as adaptive environmental pressure and temperature changes, efficient shock absorption, and stable sealing, thereby ensuring the long-term safe and effective operation of the underground gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The figure is a schematic structural diagram of a sealing structure for a connection portion between an underground gas storage reservoir and a pipeline according to an embodiment of the present invention.

[0017] In the figure: 1 is a pipeline; 2 is an elastic shell; 3 is a shock-absorbing body; 4 is a self-adhesive layer; 5 is a blocking body; and 6 is a sealing layer. DETAILED DESCRIPTION

[0018] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0019] A first aspect of an embodiment of the present invention provides a sealing structure for a connection between an underground gas storage reservoir and a pipeline, such as Figure 1 As shown, the sealing structure is coated on the outer wall of the pipeline 1, and one end of the sealing structure extends into the sealing body 5 of the underground gas storage, and the other end is located in the gas storage chamber of the underground gas storage.

[0020] The sealing structure includes an elastic shell 2 and a shock-absorbing body 3; the elastic shell 2 is sealedly connected to the outer wall of the pipeline 1, and a cavity is provided between the elastic shell 2 and the pipeline 1; the shock-absorbing body 3 is arranged in the cavity, and a self-adhesive layer 4 is provided between the shock-absorbing body 3 and the elastic shell 2 and between the shock-absorbing body 3 and the pipeline 1.

[0021] The material of the elastic shell 2 of the embodiment of the present invention can be memory alloy or spring steel. Since the memory alloy has shape memory function and good superelasticity and corrosion resistance, the embodiment of the present invention preferably uses memory alloy. The embodiment of the present invention makes the elastic shell 2 into an integrated structure adapted to the pipeline 1, and the preset pressure range is Pmin~Pmax (combined with the actual operating pressure of the underground gas storage reservoir, the value range is such as 0.1MPa~10MPa), which can be flexibly and reversibly deformed with the fluctuation of environmental pressure. When installed at normal temperature and pressure, it is in a flexible state for convenient operation. After being put into operation and under pressure, it immediately shrank and fitted tightly according to the "memory" shape, effectively compensating for the gap between thermal expansion and contraction, buffering external impact, and adapting to complex working environments.

[0022] The shock absorbing body 3 in the embodiment of the present invention is made of carbon fiber reinforced epoxy resin composite material, the elastic modulus of the material is 70 GPa, the damping ratio is 0.15, and the density is 1.6 g / cm 3 , the compressive strength is 450MPa. It has high strength, excellent damping performance and fatigue resistance, and can effectively attenuate the vibration energy of pipeline 1.

[0023] The self-adhesive layer 4 in the embodiment of the present invention adopts a modified epoxy resin adhesive, whose bonding strength can reach 25 MPa at room temperature, and its bonding strength can still reach 20 MPa in the range of -40°~120°, and the shear modulus can reach 1.2 GPa.

[0024] In order to further enhance the bonding strength between the self-adhesive layer 4 and the corresponding adhesive, the embodiment of the present invention pre-treats the adhesive before bonding. For example, the interface between the shock absorber 3 and the elastic shell 2 is subjected to surface sandblasting so that the surface roughness of the interface between the shock absorber 3 and the elastic shell 2 reaches Ra=3.2μm or more, thereby enhancing mechanical bite. Furthermore, the embodiment of the present invention also chemically cleans the interface between the shock absorber 3 and the pipeline 1 and then coats the coupling agent to enhance the wettability of the modified epoxy resin adhesive, thereby enhancing the bonding strength of the self-adhesive layer 4.

[0025] The sealing structure of the present invention adopts a four-layer structure of an elastic shell 2, a self-adhesive layer 4, a shock-absorbing body 3 and a self-adhesive layer 4 from the outside to the inside. The four-layer structure has a clear division of labor and complements each other. The elastic shell 2 uses a memory alloy. The memory alloy as the outer layer uses shape memory and superelasticity to cope with environmental pressure and temperature difference changes, actively adapts to the working conditions and adjusts the fitting state, so as to resist external force impact for the overall sealing structure; the shock-absorbing body 3 can effectively attenuate vibration energy and reduce the cause of sealing failure from the root; each layer of the self-adhesive layer 4 can ensure that the adhesives on the corresponding two sides are firmly bonded, thereby constructing a strict airtight system. The sealing structure of the present invention can effectively ensure the sealing of the connection between the underground gas storage and the pipeline 1 when the gas state changes sharply during the filling and degassing process of the underground gas storage, and has multiple advantages such as adaptive environmental pressure and temperature changes, efficient shock absorption, and stable sealing, so as to ensure the long-term safe and effective operation of the underground gas storage.

[0026] Since one end of the sealing structure of the present invention is located in the gas storage chamber of the underground gas storage, in order to ensure the structural integrity and mechanical stability of the sealing structure when it is subjected to external pressure, the shape of the sealing structure in the embodiment of the present invention is preferably sac-shaped. The sac-shaped structure has the advantages of adaptive fitting and uniform force distribution, and can better withstand and transmit pressure. The sac-shaped structure and the elastic shell 2 are made of memory alloy, so that the sealing structure of the present invention can resist external impact (such as geological activities, pipeline 1 installation collision, etc.), and also compensate for thermal expansion and contraction, maintain mechanical stability, ensure long-term stable operation of the sealing structure, and extend the service life of the sealing structure and the connected pipeline 1.

[0027] In order to ensure a stable connection between the sealing structure and the blocking body 5 and prevent the sealing structure from falling off, the length of one end of the sealing structure in the embodiment of the present invention extending into the blocking body 5 of the underground gas storage is greater than or equal to 100 mm.

[0028] In order to further improve the sealing performance of the sealing structure, the embodiment of the present invention also provides a sealing layer 6 on the surface of the elastic shell 2 located outside the sealing body 5 and the surface of the sealing body 5 located in the gas storage chamber of the underground gas storage.

[0029] The sealing structure of the present invention is in the shape of a bag and fits the pipe 1 for inflating and deflation. The four layers of the structure perform their respective functions and work in synergy. The outer layer of memory alloy builds a mechanical protection "barrier" that adapts to temperature changes and external forces; the middle layer of shock absorber 3 "absorbs" the vibration energy of the pipe 1 and stabilizes the seal; the high-strength self-adhesive layer 4 between the layers ensures "seamless" bonding of the interface and locks the airtightness.

[0030] The second aspect of the present invention provides a method for determining parameters of a sealing structure for a connection between an underground gas storage reservoir and a pipeline as described above, wherein the parameters include the thickness of the elastic shell 2 , then the thickness of the elastic shell 2 Methods for determining include:

[0031] Step A1: Determine the safety parameters corresponding to the material of the elastic shell 2. For example, the material of the elastic shell 2 is a memory alloy.

[0032] The safety parameters of the embodiment of the present invention include yield strength and safety factor , where the safety factor Specifically .

[0033] Step A2: According to the diameter of pipe 1 2. External pressure during operation of underground gas storage The thickness of the elastic shell 2 is determined by the following safety parameters:

[0034] Step A21: Based on the external pressure of the underground gas storage during operation and safety factor The actual bearing capacity of the elastic shell 2 is determined by multiplying , that is ;

[0035] Step A22: According to the yield strength and actual bearing capacity The difference between the values ​​of ,Right now ;

[0036] Step A23: According to the quotient of the actual bearing capacity and the bearing capacity margin and the diameter of the pipeline 1 Determine the thickness of the elastic shell 2 .

[0037] For example, the thickness of the elastic shell 2 is determined according to the following formula (1): :

[0038] (1)

[0039] In the formula, is the thickness of the elastic shell 2; is the diameter of pipe 1; is the safety factor corresponding to the material of the elastic housing 2; is the external pressure during operation of the underground gas storage; is the yield strength corresponding to the material of the elastic shell 2.

[0040] The above formula (1) is derived from the cylinder force model and strength theory. The thickness of the elastic shell 2 determined by the above formula (1) is , which can ensure that the elastic shell 2 made of the memory alloy maintains structural integrity, stably exerts shape memory and adaptive fitting performance when subjected to external pressure, and resists external impact and pressure.

[0041] The parameters of the sealing structure of the embodiment of the present invention also include the thickness of the shock absorbing body 3 , then the thickness of the shock absorbing body 3 Methods for determining include:

[0042] Step B1: Obtaining the mechanical parameters of the shock absorbing body 3 and the preset target vibration isolation rate .

[0043] The material of the shock absorbing body 3 in the embodiment of the present invention can be a composite fiber material. The shock absorbing body 3 is an annular sleeve structure, and its mechanical parameters include elastic modulus and damping ratio .

[0044] Step B2: According to the operating frequency of pipeline 1 , mechanical parameters and target vibration isolation rate Determining the thickness of the shock absorbing body 3 specifically includes:

[0045] Step B21: According to the target vibration isolation rate Determine the amount of vibration isolation , .

[0046] Step B22: According to the elastic modulus , Damping ratio and operating frequency Determine the amount of vibration , illustratively, .

[0047] Step B23: According to the vibration isolation amount and vibration amount The thickness of the shock absorbing body 3 is determined by the quotient of , as shown in formula (2).

[0048] (2)

[0049] In the formula, is the thickness of the shock absorbing body 3; is the correction coefficient, which ranges from 0.8 to 1.2 and can be adjusted according to the installation process; is the target vibration isolation rate; is the elastic modulus of the shock absorbing body 3; is the damping ratio of the shock absorbing body 3; is the operating frequency of pipeline 1.

[0050] The thickness of the shock absorbing body 3 determined in the embodiment of the present invention enables the shock absorbing body 3 to significantly consume vibration energy, reduce the impact of the vibration of the pipeline 1 on the sealing structure, and prevent problems such as material fatigue and loose connection caused by long-term vibration.

[0051] The shock absorbing body 3 in the embodiment of the present invention is made of carbon fiber reinforced epoxy resin composite material, the elastic modulus of the material is 70 GPa, the damping ratio is 0.15, and the density is 1.6 g / cm 3 , the compressive strength is 450MPa, and its elastic modulus and damping ratio can meet the vibration calculation requirements of formula (2), ensuring the scientific nature of the vibration design of the shock-absorbing body 3.

[0052] The above carbon fiber reinforced epoxy resin composite material was used to verify the shock absorption performance, and the target vibration isolation rate =90%, pipeline operation frequency =50hz, correction factor Taking 1.0, substituting the parameters into formula (2), the thickness of the shock absorber 3 is 12.5 mm. During the actual installation, the vibration transmission rate of the pipeline is reduced to 8% and the vibration isolation rate can reach 92%, which verifies the effectiveness of the formula.

[0053] It has passed GB / T 13927-2008 "Industrial Valve Pressure Test". When the test pressure is 1.5 times the design pressure, the overall structure leakage rate is <0.001ml / (min.m), which is much lower than the industry standard of 0.01 ml / (min.m).

[0054] The parameters of the sealing structure of the embodiment of the present invention also include the thickness of the self-adhesive layer 4 , then the thickness of the self-adhesive layer 4 Methods for determining include:

[0055] Step C1: Obtaining the bonding strength of the self-adhesive used in the self-adhesive layer 4 , Roughness and shear modulus .

[0056] Among them, the bonding strength The shear stress at the interface needs to be exceeded. It is determined according to the roughness values ​​of the adhesives on both sides of the self-adhesive layer 4, for example, the maximum value of the roughness values ​​of the adhesives on both sides of the self-adhesive layer 4 is used as the roughness of the self-adhesive layer 4, or the average value of the roughness values ​​of the adhesives on both sides of the self-adhesive layer 4 is used as the roughness of the self-adhesive layer 4.

[0057] In the embodiment of the present invention, the thickness of the self-adhesive layer 4 between the shock absorbing body 3 and the elastic shell 2 and the thickness of the self-adhesive layer 4 between the shock absorbing body 3 and the pipeline 1 can be determined respectively by referring to the above method.

[0058] Step C2: Determine the bond strength and roughness The product of ,Right now .

[0059] Step C3: According to the first value and shear modulus The thickness of the self-adhesive layer 4 is determined by the quotient of , as shown in formula (3):

[0060] (3)

[0061] In the formula, is the thickness of the self-adhesive layer 4; is the bonding strength; is the roughness; is the shear modulus.

[0062] The thickness of the self-adhesive layer 4 determined in the embodiment of the present invention is , which can strengthen interface adhesion and eliminate gas leakage paths.

[0063] The self-adhesive layer 4 in the embodiment of the present invention adopts a modified epoxy resin adhesive, whose bonding strength can reach 25 MPa at room temperature, and its bonding strength can still reach 20 MPa in the range of -40°~120°, and the shear modulus can reach 1.2 GPa.

[0064] In order to verify the feasibility of the modified epoxy resin adhesive in underground gas storage with large temperature and pressure changes, the present invention tests the strength of the modified epoxy resin adhesive used in the self-adhesive layer 4 according to the ASTM D1002-10 "Tensile Shear Strength Test" standard. The modified epoxy resin adhesive has a bonding strength higher than the design requirement (≥18 MPa) under the working conditions of -30°C~80°C and 0.1~10 MPa. The specific performance data are shown in Table 1.

[0065] Table 1 Performance data of modified epoxy resin strength test experiment

[0066]

[0067] According to the aging performance test of ISO188 "Vulcanized or thermoplastic rubber - Accelerated aging and heat resistance tests", its performance can reach 92.9% after 1,000 hours of long-term operation in a hot and humid environment, meeting the long-term operation requirements of underground gas storage.

[0068] The parameters of the sealing structure of the embodiment of the present invention also include the length of the sealing body 5 extending into the underground gas storage reservoir. and the extended length of the sealing structure outside the plugging body 5 of the underground gas storage reservoir The embodiment of the present invention considers the stability of the bladder structure during long-term operation and defines Not less than 100mm. To meet the stability under vibration and pressure changes, determine The methods include:

[0069] Step D1: Obtain the vibration amplitude of pipeline 1 and the deformation of the elastic shell 2 .

[0070] Step D2: Determine the extension length based on the quotient of the vibration amplitude and the deformation amount , as shown in formula (4):

[0071] (4)

[0072] In the formula, is the extended length of the sealing structure outside the sealing body 5 of the underground gas storage; is the empirical coefficient, with a value between 3 and 5; is the vibration amplitude of pipeline 1; is the deformation of the elastic shell 2.

[0073] The construction process of the sealing structure of the embodiment of the present invention is as follows: the prepared high-strength self-adhesive is evenly pasted on the inner and outer surfaces of the shock absorber 3, ensuring that the two prepared self-adhesive layers 4 are tightly combined with the shock absorber 3 without bubbles and gaps, and then the shock absorber 3 is bonded to the outer wall of the pipe 1 through the self-adhesive layer 4, and then the bladder-shaped elastic shell 2 is inserted and wrapped around the outer surface of the shock absorber 3. At this time, the elastic shell 2 is bonded to the self-adhesive layer 4, and the pipe 1 and the elastic shell 2 are sealed using special welding, so that the pipe 1 and the elastic shell 2 form a complete body.

[0074] Furthermore, after the above construction is completed, the embodiment of the present invention pressurizes the elastic shell 2 made of the memory alloy material through a pressurizing device, so that its pressure is increased to above the deformation pressure of the memory alloy, and the memory alloy begins to recover its shape and gradually fits tightly to the connection part between the pipeline 1 and the plugging body 5 of the gas storage reservoir. In the process of the memory alloy recovering its shape, the shock absorbing body 3 is also further compressed, and its shock absorbing performance and auxiliary sealing performance are fully exerted. At the same time, the self-adhesive layer 4 is completely adhered to the connection surface under the pressure to form a reliable seal.

[0075] The construction process of the sealing structure of the embodiment of the present invention is clear and reasonable. The phase change characteristics of the memory alloy are used to activate the bonding at the end of the installation. At the same time, the functions of each layer are coordinated to complete the construction of the sealing system in one go, and the operation is relatively simple.

[0076] During the operation of the underground gas storage in the embodiment of the present invention, the sac-shaped sealing structure expands under pressure, squeezing the shock absorbing body 3 inside and fitting the plugging body 5 outside, thereby enhancing the integrity.

[0077] The present invention deeply integrates multidisciplinary theories and designs a composite sac-like sealing structure with multiple advantages such as adaptive environmental pressure and temperature changes, efficient shock absorption, and stable sealing. It directly solves the sealing problem of the connection part of the underground gas storage pipeline 1, fills the gap in the existing technology, and ensures the long-term safe and effective operation of the gas storage.

[0078] The above are only several embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, using the above disclosed technical content to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for determining parameters of a sealing structure for a connection between an underground gas storage reservoir and a pipeline, characterized in that: The sealing structure is coated on the outer wall of the pipeline, and one end of the sealing structure extends into the sealing body of the underground gas storage; The sealing structure comprises an elastic shell and a shock absorbing body; the elastic shell is made of memory alloy; The elastic shell is sealedly connected to the outer wall of the pipeline, and a cavity is provided between the elastic shell and the pipeline; the elastic shell and the pipeline are an integrated structure; The shock absorbing body is arranged in the cavity, and a self-adhesive layer is arranged between the shock absorbing body and the elastic shell and between the shock absorbing body and the pipe; The parameters of the sealing structure include the thickness of the elastic shell, and the method for determining the thickness of the elastic shell includes: Determining safety parameters corresponding to the material of which the elastic housing is made; The thickness of the elastic shell is determined according to the diameter of the pipeline, the external pressure during operation of the underground gas storage reservoir, and the safety parameter.

2. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The sealing structure is in a capsule shape.

3. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The length of one end of the sealing structure extending into the sealing body of the underground gas storage is greater than or equal to 100 mm.

4. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The safety parameters include yield strength and safety factor. The thickness of the elastic shell is determined according to the diameter of the pipeline, the external pressure during operation of the underground gas storage reservoir and the safety parameters, specifically including: Determine the actual bearing capacity of the elastic shell according to the product of the external pressure during operation of the underground gas storage and the safety factor; Determining the bearing capacity margin of the elastic shell according to the difference between the yield strength and the actual bearing capacity; The thickness of the elastic shell is determined according to the quotient of the actual bearing force and the bearing force margin and the diameter of the pipe.

5. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The parameter also includes the thickness of the shock absorbing body, and the method for determining the thickness of the shock absorbing body includes: Obtaining mechanical parameters of the shock absorber and a preset target vibration isolation rate; The thickness of the shock absorbing body is determined according to the operating frequency of the pipeline, the mechanical parameters and the target vibration isolation rate.

6. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 5, characterized in that: The mechanical parameters include elastic modulus and damping ratio. The thickness of the shock absorber is determined according to the operating frequency of the pipeline, the mechanical parameters and the target vibration isolation rate, specifically including: determining a vibration isolation amount according to the target vibration isolation rate; determining a vibration amount according to the elastic modulus, the damping ratio and the operating frequency; The thickness of the vibration-absorbing body is determined according to the quotient of the vibration-isolating amount and the vibration amount.

7. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The parameter also includes the thickness of the self-adhesive layer, and the method for determining the thickness of the self-adhesive layer includes: Obtaining the bonding strength, roughness and shear modulus of the self-adhesive used in the self-adhesive layer, wherein the roughness is determined according to the roughness value of the adhesives on both sides of the self-adhesive layer; Determine the product of the bonding strength and the roughness, and record it as a first value; The thickness of the self-adhesive layer is determined according to a quotient of the first value and the shear modulus.

8. The method for determining parameters of the sealing structure for the connection between an underground gas storage reservoir and a pipeline according to claim 1, characterized in that: The parameters also include a protruding length of a sealing structure outside a plugging body of the underground gas storage reservoir, and the method for determining the protruding length includes: Obtaining the vibration amplitude of the pipeline and the deformation of the elastic shell; The extension length is determined according to a quotient of the vibration amplitude and the deformation amount.

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