An airtightness testing device and testing method for an underground high-pressure gas storage seal material

Abstract

The present invention discloses an underground high-pressure gas storage reservoir sealing material airtightness testing device and testing method, which relates to the field of underground gas storage technology, including: a rigid constraint cylinder, the upper opening of which is sealed with a first flange cover, the lower opening of which is provided with a second flange cover, a concrete sealing tank concentrically arranged in the rigid constraint cylinder, a gas cavity defined in the concrete sealing tank, an installation cavity defined between the concrete sealing tank and the rigid constraint cylinder, an air pressure regulating device for regulating the air pressure in the gas cavity, a high-pressure water bag, which is arranged in the installation cavity, a water pressure regulating device for regulating the water pressure of the high-pressure water bag, and a sealing material layer arranged on the side wall of the gas cavity. By controlling the internal air pressure and external water pressure of the concrete sealing tank to simulate the stress environment of the high-pressure gas storage reservoir and the deformation of the concrete sealing tank, the sealing performance test of the sealing material layer is achieved. The test conditions are close to the real environment, and the test results are more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of underground gas storage, and in particular to an airtightness testing device and a testing method for sealing materials of underground high-pressure gas storage reservoirs. Background Art

[0002] In underground gas storage, the sealing layer plays a crucial role, ensuring its airtightness. Most existing underground gas storage facilities use steel plates as sealing layers. However, these are expensive and difficult to install. Currently, the main research direction for underground gas storage facilities both domestically and internationally is to replace these steel plates with reinforced concrete tanks combined with sealing materials. Sealing materials primarily include organic polymers, high-molecular rubber, and fiberglass. Airtightness is verified by designing a gas permeation device (the airtightness of a flexible sealed compressed air storage energy (CAES) tunnel, considering the permeation accumulation of high-pressure air). This device test cannot simulate the complex environmental conditions of high-pressure gas storage, and the stresses on the sealing material do not match actual conditions, making the test results unrepresentative.

[0003] In view of this, how to provide a device that can simulate the environmental conditions of a high-pressure gas storage reservoir to make the airtightness test of the gas storage reservoir sealing material more accurate is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide an airtightness testing device and a testing method for underground high-pressure gas storage sealing materials, so as to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned object, the present invention provides an airtightness testing device for sealing materials of underground high-pressure gas storage, comprising:

[0006] The rigid constraint cylinder is a cylindrical structure with upper and lower openings, wherein the upper opening is sealed with a first flange cover, and the lower opening is sealed with a second flange cover;

[0007] A concrete sealing tank is concentrically disposed in the rigid constraint cylinder, a gas cavity is defined in the concrete sealing tank, and an installation cavity is defined between the concrete sealing tank and the rigid constraint cylinder;

[0008] an air pressure regulating device, connected to the gas cavity and used to regulate the air pressure of the gas cavity;

[0009] A high-pressure water bag is arranged in the installation cavity;

[0010] a water pressure regulating device, connected to the high-pressure water bag and used to regulate the water pressure of the high-pressure water bag;

[0011] The sealing material layer is arranged on the side wall of the gas cavity.

[0012] Furthermore, it also includes:

[0013] A reaction frame having a support and a crossbeam, wherein the second flange cover is provided on the base, the support is vertically provided on the base and is located on both sides of the second flange cover, and the crossbeam is horizontally provided on the top of the support and is located above the first flange cover;

[0014] The jack is arranged on the crossbeam, and the output end of the jack is connected to the first flange cover.

[0015] Furthermore, a plurality of reinforcing ribs are provided on the upper surface of the first flange cover, and the output end of the jack is connected to the reinforcing ribs.

[0016] Furthermore, it also includes:

[0017] a gasket, disposed at the upper end of the high-pressure water bag and connected to the first flange cover;

[0018] An L-shaped steel ring having a horizontal section and a vertical section, wherein the horizontal section is provided on the upper edge of the concrete sealing tank and the vertical section extends downward to the side wall of the gas cavity;

[0019] The first flange cover extends downward to form a circular connecting portion, the bottom surface of the circular connecting portion is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket.

[0020] Furthermore, the air pressure regulating device is a gas compressor, and the first flange cover is provided with air holes through the upper and lower surfaces, one end of the air hole is connected to the gas cavity, and the other end is connected to the gas compressor; a pressure gauge is provided on the lower surface of the first flange cover, and the pressure gauge and the gas compressor are both electrically connected to the computer control center, and the pressure gauge is used to detect the air pressure of the gas cavity and feed it back to the computer control center, and the computer control center controls the air pressure of the gas cavity through the gas compressor.

[0021] Furthermore, the water pressure regulating device is a high-pressure water pump, and the rigid constraint cylinder is provided with water holes through the inner and outer surfaces. The water inlet pipe of the high-pressure water bag is connected to the high-pressure water pump through the water hole. A water pressure gauge is provided in the high-pressure water bag, and the water pressure gauge and the high-pressure water pump are both electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure of the high-pressure water bag and feed it back to the computer control center, and the computer control center controls the water pressure of the high-pressure water bag through the high-pressure water pump.

[0022] Furthermore, it also includes:

[0023] A centering ring is provided at the lower end of the high-pressure water bag and connected to the second flange cover. The centering ring is arranged concentrically with the concrete sealing tank. The inner and outer surfaces of the centering ring are respectively connected to the concrete sealing tank and the rigid constraint cylinder.

[0024] Furthermore, it also includes:

[0025] A sealing gasket is provided with a mounting groove along the circumferential direction on the lower surface of the circular ring connecting portion, and the sealing gasket is arranged in the mounting groove and connected to the upper surface of the L-shaped steel ring.

[0026] Furthermore, the upper opening and the lower opening of the rigid constraint cylinder extend outward to form an upper connecting plate and a lower connecting plate, the upper connecting plate is connected to the first flange cover by bolts, and the lower connecting plate is connected to the second flange cover by bolts.

[0027] The present invention also provides a method for testing the air tightness of an underground high-pressure gas storage sealing material, which uses the air tightness testing device for the underground high-pressure gas storage sealing material, comprising the following steps:

[0028] S1: Install the horizontal section of the L-shaped steel ring on the upper edge of the concrete sealing tank, with the vertical section close to the side wall of the gas cavity, and spray the sealing material on the side wall of the gas cavity to form a sealing material layer;

[0029] S2: Install the reaction frame and the second flange cover on the base;

[0030] S3: Install the concrete sealing pot and the rigid restraint cylinder on the second flange cover in sequence, install a centering ring between the concrete sealing pot and the rigid restraint cylinder, and arrange the centering ring, the concrete sealing pot, and the rigid restraint cylinder concentrically. The inner and outer surfaces of the centering ring are respectively connected to the concrete sealing pot and the rigid restraint cylinder. Connect the rigid restraint cylinder to the second flange cover with bolts.

[0031] S4: Arrange a high-pressure water bag in the installation cavity, lead its water inlet pipe out from the water hole and connect it to a high-pressure water pump, inject water at a preset pressure into the high-pressure water bag through the high-pressure water pump, and arrange a gasket ring on the top of the high-pressure water bag;

[0032] S5: Install a sealing gasket in the installation groove opened along the circumferential direction on the lower surface of the gasket ring. The sealing gasket is connected to the upper surface of the L-shaped steel ring. Connect the rigid constraint cylinder to the first flange cover with bolts.

[0033] S6: The computer control center adjusts the air pressure in the gas cavity to the target air pressure through the gas compressor, and adjusts the water pressure of the high-pressure water bag to the target water pressure through the high-pressure water pump. The inside of the concrete sealing tank bears the target air pressure, and the outside bears the target water pressure, forming a stress environment for the high-pressure gas storage.

[0034] The present invention discloses the following technical effects:

[0035] 1. By controlling the internal air pressure and external water pressure of the concrete sealed tank, the stress environment of a high-pressure gas storage reservoir and the deformation of the concrete sealed tank are simulated, thereby testing the sealing performance of the sealing material layer. The test conditions are close to the real environment, and the test results are more accurate. The internal air pressure and external water pressure are dynamically and precisely adjusted by the computer control center, which has good application prospects and a wide range of applications.

[0036] 2. An L-shaped steel ring and a sealing gasket are set between the concrete sealing tank and the first flange cover to ensure the sealing of the concrete sealing tank and avoid air leakage between the concrete sealing tank and the first flange cover during the test.

[0037] 3. A reinforcing rib is set on the top of the first flange cover, which cooperates with the reaction frame and the jack to prevent the first flange cover from bulging under high pressure environment, thereby ensuring the sealing of the concrete sealing tank.

[0038] 4. A centering ring is concentrically arranged between the concrete sealing tank and the rigid constraint cylinder to ensure that the three are concentrically arranged, so that the internal air pressure and external water pressure of the concrete sealing tank are evenly distributed, and the stress conditions are closer to the real environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 Schematic diagram of the structure of the first flange cover;

[0042] Figure 3 Schematic diagram of the rigid constraint tube structure;

[0043] Figure 4 This is the stress state diagram of the concrete sealing tank;

[0044] Among them, 1. Rigid constraint cylinder; 2. First flange cover; 3. Second flange cover; 4. Concrete sealing tank; 5. High-pressure water bag; 6. Reaction frame; 7. Base; 8. Jack; 9. Reinforcement rib; 10. Gasket; 11. L-shaped steel ring; 12. Air hole; 13. Pressure gauge installation hole; 14. Water hole; 15. Centering ring; 16. Sealing gasket; 17. Ring connection part; 18. Installation groove. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] An embodiment of the present invention provides an airtightness testing device for sealing materials of an underground high-pressure gas storage reservoir, comprising:

[0048] The rigid constraint cylinder 1 is a cylindrical structure with upper and lower openings, wherein the upper opening is sealed with a first flange cover 2 and the lower opening is sealed with a second flange cover 3;

[0049] The concrete sealing tank 4 is concentrically arranged in the rigid constraint cylinder 1, a gas cavity is defined in the concrete sealing tank 4, and an installation cavity is defined between the concrete sealing tank 4 and the rigid constraint cylinder 1;

[0050] An air pressure regulating device, connected to the gas cavity, is used to regulate the air pressure of the gas cavity to generate internal air pressure for the concrete sealing tank 4;

[0051] The high-pressure water bag 5 is arranged in the installation cavity. The high-pressure water bag 5 cooperates with the rigid constraint cylinder 1 to generate external water pressure on the concrete sealing tank 4;

[0052] A water pressure regulating device, connected to the high-pressure water bag 5 and used to regulate the water pressure of the high-pressure water bag 5;

[0053] The sealing material layer is arranged on the side wall of the gas cavity.

[0054] In this embodiment, it also includes:

[0055] The reaction frame 6 has pillars and beams. The second flange cover 3 is provided on the base 7. The pillars are vertically provided on the base 7 and are located on both sides of the second flange cover 3. The beams are horizontally provided on the tops of the pillars and are located above the first flange cover 2.

[0056] The jack 8 is arranged on the crossbeam, and its output end is connected to the first flange cover 2.

[0057] In this embodiment, the upper surface of the first flange cover 2 is provided with a plurality of reinforcing ribs 9, and the output end of the jack 8 is connected to the reinforcing ribs 9. The reaction frame 6 and the jack 8 can provide longitudinal constraints on the top of the first flange cover 2, preventing the first flange cover 2 from bulging under the action of the high-pressure gas.

[0058] In this embodiment, it also includes:

[0059] The gasket 10 is provided at the upper end of the high-pressure water bag 5 and connected to the first flange cover 2;

[0060] An L-shaped steel ring 11 has a horizontal section and a vertical section, the horizontal section is arranged on the upper edge of the concrete sealing tank 4, and the vertical section extends downward to the side wall of the gas cavity;

[0061] The first flange cover 2 extends downward to form a circular connecting portion 17 . The bottom surface of the circular connecting portion 17 is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket 10 .

[0062] In this embodiment, the air pressure regulating device is a gas compressor. The first flange cover 2 is provided with air holes 12 through the upper and lower surfaces. One end of the air hole 12 is connected to the gas cavity, and the other end is connected to the gas compressor; a pressure gauge mounting hole 13 is provided on the lower surface of the first flange cover 2, and the pressure gauge is arranged in the pressure gauge mounting hole 13. The pressure gauge and the gas compressor are both electrically connected to the computer control center. The pressure gauge is used to detect the air pressure of the gas cavity and feed it back to the computer control center. The computer control center controls the air pressure of the gas cavity through the gas compressor.

[0063] In this embodiment, the water pressure regulating device is a high-pressure water pump. A water hole 14 is opened through the inner and outer surfaces of the rigid constraint cylinder 1. The water inlet pipe of the high-pressure water bag 5 is connected to the high-pressure water pump through the water hole 14. A water pressure gauge is provided in the high-pressure water bag 5. The water pressure gauge and the high-pressure water pump are both electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure of the high-pressure water bag 5 and feed it back to the computer control center. The computer control center controls the water pressure of the high-pressure water bag 5 through the high-pressure water pump.

[0064] In this embodiment, it also includes:

[0065] The centering ring 15 is provided at the lower end of the high-pressure water bag 5 and connected to the second flange cover 3. The centering ring 15 is arranged concentrically with the concrete sealing tank 4. The inner and outer surfaces of the centering ring 15 are connected to the concrete sealing tank 4 and the rigid constraint cylinder 1 respectively.

[0066] In this embodiment, it also includes:

[0067] Gasket 16 and annular connecting portion 17 have mounting grooves 18 circumferentially defined on their lower surfaces. Gasket 16 is positioned within mounting grooves 18 and engages the upper surface of L-shaped steel ring 11. L-shaped steel ring 11 and gasket 16 are positioned between concrete sealing pot 4 and first flange cover 2 to ensure the sealing of concrete sealing pot 4 and prevent air leakage between the two areas during testing.

[0068] In this embodiment, the upper opening and the lower opening of the rigid constraint cylinder 1 extend outward to form an upper connecting plate and a lower connecting plate. The upper connecting plate is connected to the first flange cover 2 by bolts, and the lower connecting plate is connected to the second flange cover 3 by bolts.

[0069] The present invention also provides a method for testing the air tightness of an underground high-pressure gas storage sealing material, using an underground high-pressure gas storage sealing material air tightness testing device, comprising the following steps:

[0070] S1: Install the horizontal section of the L-shaped steel ring 11 on the upper edge of the concrete sealing tank 4, with the vertical section close to the side wall of the gas cavity, and spray a sealing material on the side wall of the gas cavity to form a sealing material layer;

[0071] S2: Install the reaction frame 6 and the second flange cover 3 on the base 7;

[0072] S3: Install the concrete sealing pot 4 and the rigid constraint cylinder 1 on the second flange cover 3 in sequence, install a centering ring 15 between the concrete sealing pot 4 and the rigid constraint cylinder 1, and arrange the centering ring 15, the concrete sealing pot 4, and the rigid constraint cylinder 1 concentrically. The inner and outer surfaces of the centering ring 15 are respectively connected to the concrete sealing pot 4 and the rigid constraint cylinder 1. Connect the rigid constraint cylinder 1 to the second flange cover 3 with bolts;

[0073] S4: Arrange the high-pressure water bag 5 in the installation cavity, lead its water inlet pipe from the water hole 14 and connect it to the high-pressure water pump, inject water at a preset pressure into the high-pressure water bag 5 through the high-pressure water pump, and arrange the gasket 10 on the top of the high-pressure water bag 5;

[0074] S5: Install the sealing gasket 16 in the installation groove 18 opened along the circumferential direction on the lower surface of the gasket ring 10. The sealing gasket 16 is connected to the upper surface of the L-shaped steel ring 11. The rigid constraint cylinder 1 is connected to the first flange cover 2 by bolts.

[0075] S6: The computer control center adjusts the air pressure in the gas cavity to the target air pressure using a gas compressor, and adjusts the water pressure in the high-pressure water bag 5 to the target water pressure using a high-pressure water pump. The concrete sealed tank 4 bears the target air pressure inside, and the concrete sealed tank 4 bears the target water pressure outside, creating a stress-bearing environment for the high-pressure gas storage. Based on the desired simulated operating conditions, the computer control center intelligently and dynamically adjusts the target air and water pressures through theoretical calculations or numerical simulations, thereby controlling the deformation of the concrete sealed tank 4 and testing the sealing performance of the sealing material layer.

[0076] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0077] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An underground high-pressure gas storage sealing material airtightness testing device, characterized in that: include: The rigid constraint cylinder (1) is a cylindrical structure with upper and lower openings, wherein the upper opening is sealed with a first flange cover (2), and the lower opening is sealed with a second flange cover (3); A concrete sealing tank (4) is concentrically arranged in the rigid constraint cylinder (1), a gas cavity is defined in the concrete sealing tank (4), and an installation cavity is defined between the concrete sealing tank (4) and the rigid constraint cylinder (1); an air pressure regulating device, connected to the gas cavity and used to regulate the air pressure of the gas cavity; A high-pressure water bag (5) is arranged in the installation cavity; a water pressure regulating device, connected to the high-pressure water bag (5) and used for regulating the water pressure of the high-pressure water bag (5); a sealing material layer, disposed on a side wall of the gas cavity; A reaction frame (6) having a support and a crossbeam, wherein the second flange cover (3) is arranged on the base (7), the support is vertically arranged on the base (7) and is located on both sides of the second flange cover (3), and the crossbeam is horizontally arranged on the top of the support and is located above the first flange cover (2); A jack (8) is provided on the crossbeam, and an output end thereof is connected to the first flange cover (2); a plurality of reinforcing ribs (9) are provided on the upper surface of the first flange cover (2), and the output end of the jack (8) is connected to the reinforcing ribs (9); A gasket (10) is provided at the upper end of the high-pressure water bag (5) and connected to the first flange cover (2); An L-shaped steel ring (11) having a horizontal section and a vertical section, wherein the horizontal section is arranged on the upper edge of the concrete sealing tank (4), and the vertical section extends downward to the side wall of the gas cavity; The first flange cover (2) extends downward to form a circular connecting portion (17), the bottom surface of the circular connecting portion (17) is connected to the horizontal section, the inner side surface is flush with the vertical section, and the outer side surface is connected to the gasket (10); The air pressure regulating device is a gas compressor. The first flange cover (2) is provided with air holes (12) through the upper and lower surfaces. One end of the air hole (12) is connected to the gas cavity, and the other end is connected to the gas compressor. A pressure gauge is provided on the lower surface of the first flange cover (2). The pressure gauge and the gas compressor are both electrically connected to a computer control center. The pressure gauge is used to detect the air pressure of the gas cavity and feed it back to the computer control center. The computer control center controls the air pressure of the gas cavity through the gas compressor.

2. The airtightness testing device for underground high-pressure gas storage sealing materials according to claim 1 is characterized in that: The water pressure regulating device is a high-pressure water pump. The rigid constraint cylinder (1) is provided with water holes (14) through the inner and outer surfaces. The water inlet pipe of the high-pressure water bag (5) is connected to the high-pressure water pump through the water hole (14). A water pressure gauge is provided in the high-pressure water bag (5). The water pressure gauge and the high-pressure water pump are both electrically connected to the computer control center. The water pressure gauge is used to detect the water pressure of the high-pressure water bag (5) and feed it back to the computer control center. The computer control center controls the water pressure of the high-pressure water bag (5) through the high-pressure water pump.

3. The airtightness testing device for underground high-pressure gas storage sealing materials according to claim 2, characterized in that: Also includes: A centering ring (15) is provided at the lower end of the high-pressure water bag (5) and connected to the second flange cover (3). The centering ring (15) is arranged concentrically with the concrete sealing tank (4). The inner and outer surfaces of the centering ring (15) are respectively connected to the concrete sealing tank (4) and the rigid constraint cylinder (1).

4. The airtightness testing device for underground high-pressure gas storage sealing materials according to claim 2, characterized in that: Also includes: A sealing gasket (16) is provided on the lower surface of the annular connecting portion (17) along the circumferential direction with a mounting groove (18), and the sealing gasket (16) is arranged in the mounting groove (18) and connected to the upper surface of the L-shaped steel ring (11).

5. The airtightness testing device for underground high-pressure gas storage sealing materials according to claim 2, characterized in that: The upper opening and the lower opening of the rigid constraint cylinder (1) extend outward to form an upper connecting plate and a lower connecting plate, the upper connecting plate being connected to the first flange cover (2) via bolts, and the lower connecting plate being connected to the second flange cover (3) via bolts.

6. A method for testing the air tightness of sealing materials for underground high-pressure gas storage, characterized in that: The airtightness testing device for underground high-pressure gas storage sealing materials according to any one of claims 2 to 5 is used, comprising the following steps: S1: The horizontal section of the L-shaped steel ring (11) is mounted on the upper edge of the concrete sealing tank (4), and the vertical section is closely attached to the side wall of the gas cavity, and a sealing material is sprayed on the side wall of the gas cavity to form a sealing material layer; S2: Install the reaction frame (6) and the second flange cover (3) on the base (7); S3: The concrete sealing tank (4) and the rigid constraint cylinder (1) are sequentially mounted on the second flange cover (3), and a centering ring (15) is mounted between the concrete sealing tank (4) and the rigid constraint cylinder (1). The centering ring (15), the concrete sealing tank (4) and the rigid constraint cylinder (1) are concentrically arranged, and the inner and outer surfaces of the centering ring (15) are respectively connected to the concrete sealing tank (4) and the rigid constraint cylinder (1), and the rigid constraint cylinder (1) is connected to the second flange cover (3) by bolts; S4: Arrange a high-pressure water bag (5) in the installation cavity, lead its water inlet pipe from the water hole (14) and connect it to a high-pressure water pump, inject water of a preset pressure into the high-pressure water bag (5) through the high-pressure water pump, and arrange a gasket ring (10) at the top of the high-pressure water bag (5); S5: Install a sealing gasket (16) in a mounting groove (18) provided along the circumferential direction on the lower surface of the gasket ring (10), connect the sealing gasket (16) to the upper surface of the L-shaped steel ring (11), and connect the rigid constraint cylinder (1) to the first flange cover (2) by means of bolts; S6: The computer control center adjusts the air pressure of the gas cavity to the target air pressure through the gas compressor, and adjusts the water pressure of the high-pressure water bag (5) to the target water pressure through the high-pressure water pump. The concrete sealing tank (4) bears the target air pressure inside and the target water pressure outside, forming a stress environment of the high-pressure gas storage reservoir.

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