Gas injection and brine discharge experimental device

Abstract

The utility model relates to an experimental device, in particular to a gas injection and brine discharge experimental device. The experimental device comprises a rack, a transverse well and a vertical well are arranged on the rack, and a sealing plate is arranged on a top port of the vertical well; the sealing plate and the central top of the transverse well are respectively connected with a brine discharging manifold; and the sealing plate is also connected with a gas injection manifold. According to the experimental device, a salt cavern can be simulated through the transverse well and the vertical well, the brine discharging manifold is matched with the gas injection manifold to simulate the gas injection and brine discharging process, in the gas injection and brine discharging process, the crystallization condition of brine in the brine discharging manifold can be observed, and the distribution and flowing conditions of brine and sediment in the vertical well and the transverse well can be observed through simulation experiments and theoretical analysis; theoretical technical support is provided for brine discharging of the salt cavern, brine discharging operation can be better carried out on the salt cavern, and the probability of blockage caused by brine crystallization in the brine discharging process can be reduced. The problems that no theoretical technical support exists in the salt cavern brine discharging process at present, the brine crystallization probability is high, and brine and sediment distribution cannot be analyzed are solved.

Description

Technical Field

[0001] The utility model relates to an experimental device, in particular to a gas injection and brine removal experimental device. Background Art

[0002] With the growth of natural gas consumption, the construction of gas storage is of great significance in ensuring energy supply security, regulating the supply and demand of the natural gas market, and promoting the development of clean energy. However, in the process of gas storage construction, how to effectively realize the storage, injection and discharge of gas, and how to solve the problem of brine discharge that may occur during the gas storage process, have become key technical difficulties. The gas storage and brine discharge experimental device is an important tool for the research and practice of gas injection and brine discharge technology in salt cavern gas storage. This device includes casing, gas injection and brine discharge inner tube and gas injection and brine discharge outer tube as main parts. Its design principle is to improve the efficiency of gas injection and brine discharge and to achieve accurate control of gas injection and brine discharge in salt cavern gas storage.

[0003] The gas injection and brine removal technology for salt cavern gas storage is one of the core technologies for its cavity construction. This technology was first used in the West-East Gas Transmission Salt Cavern Underground Gas Storage Project. However, there are some problems with the conventional first gas injection and brine removal technology, such as low brine removal efficiency and easy blockage of brine removal pipes. In the construction process of salt cavern gas storage, gas injection and brine removal technology, as a key technology for salt cavern cavity construction, plays a vital role. The West-East Gas Transmission Salt Cavern Underground Gas Storage Project is the first salt cavern underground gas storage project to use this technology. By conducting gas injection and brine removal tests on the old cavity and optimizing the ground brine removal and backwashing process, the reasonable brine removal flow, pressure range, cycle and flushing cycle were determined, providing valuable practical experience for subsequent cavity construction.

[0004] In addition, to ensure the safe and efficient construction of salt cavern gas storage, researchers have also proposed a new type of gas injection and brine removal technology that integrates brine removal pipes and injection and production pipes. This technology has been successfully applied in the Jintan salt cavern gas storage, significantly improving the efficiency of gas injection and brine removal. In general, the continuous development and improvement of gas storage and gas injection and brine removal experimental equipment and related technologies have provided strong technical support for the construction of salt cavern gas storage, and played an important role in promoting the development of natural gas storage technology.

[0005] However, there are still some related problems in brine drainage: 1. During the brine drainage process, brine is easy to crystallize in the pipeline and block the pipeline. 2. The brine drainage process is located in a closed underground environment. The discharge volume of the original brine and sediment in the salt cavern can only be measured by the brine discharge volume, and the distribution of brine and sediment at the bottom of the salt cavern cannot be observed and analyzed. Therefore, it is necessary to design a gas injection brine drainage experimental device to simulate the above situation and provide theoretical technical support. Summary of the invention

[0006] The utility model aims to provide a gas injection brine removal experimental device which can simulate actual working conditions, conduct scientific experiments on problems existing in brine removal, and further provide theoretical and technical support.

[0007] The technical solution of the utility model is:

[0008] A gas injection and brine removal experimental device consists of a frame and a transparent horizontal shaft, a vertical shaft, a sealing plate, a brine removal manifold and a gas injection manifold, and is characterized in that: a horizontal shaft is arranged on the frame, both ends of the horizontal shaft are respectively connected to the vertical shaft, a sealing plate is arranged on the top port of the vertical shaft; the sealing plate and the central top of the horizontal shaft are respectively connected to the brine removal manifold; and the gas injection manifold is connected to the sealing plate on one side of the brine removal manifold.

[0009] The bottom of the horizontal well is connected with a manual water outlet valve.

[0010] A pressure relief valve is connected to the sealing plate of the vertical shaft on one side of the horizontal shaft, and a manual water inlet valve is arranged on the sealing plate of the vertical shaft on the other side of the horizontal shaft; plugs are respectively arranged on the sealing plates of the vertical shafts on both sides of the horizontal shaft.

[0011] The brine discharge manifold is composed of a brine discharge main pipe, a brine discharge solenoid valve, a brine discharge bypass pipe and a manual brine discharge valve. The brine discharge main pipe is provided with a brine discharge solenoid valve. The brine discharge main pipes on both sides of the brine discharge solenoid valve are connected with brine discharge bypass pipes, and the brine discharge bypass pipe is provided with a manual brine discharge valve. The end of the brine discharge main pipe extends into the horizontal shaft or the vertical shaft, and the brine discharge main pipe is sealed and connected to the sealing plate or the horizontal shaft through a gland.

[0012] The gas injection manifold comprises a main air intake valve, a sub-air intake valve A and a sub-air intake valve B which are arranged in parallel; the inlet end of the sub-air intake valve A is connected to the Y-type joint connected to the inlet end of the sub-air intake valve B and the outlet end of the main air intake valve via a Y-type joint, and the inlet end of the main air intake valve is connected to the gas source via an air intake main pipe; the outlet end of the sub-air intake valve A is connected to the sealing plate of the vertical shaft on one side of the horizontal shaft; the outlet end of the sub-air intake valve B is connected to the sealing plate of the vertical shaft on the other side of the horizontal shaft via a Y-type joint.

[0013] A vortex sensor for monitoring gas flow, pressure and temperature is arranged between the main air intake valve and the Y-type joint.

[0014] The Y-type connector connected to the inlet end of the air intake valve B is also connected to the Y-type connector on the outlet end of the air intake valve B through a manual bypass valve.

[0015] The beneficial effects of the utility model are:

[0016] The gas injection brine removal experimental device can simulate salt caverns through horizontal and vertical shafts, and simulate the process of gas injection brine removal through the brine removal manifold and the gas injection manifold. During the gas injection brine removal process, the crystallization of brine in the brine removal manifold can be observed, as well as the distribution and flow of brine and sediment in the vertical and horizontal shafts. Through simulation experiments and theoretical analysis, theoretical technical support can be provided for brine removal in salt caverns, and brine removal operations can be better performed in salt caverns, and the probability of blockage caused by brine crystallization during brine removal can be reduced. The problem that there is no theoretical technical support in the current brine removal process in salt caverns, resulting in a high probability of brine crystallization and the inability to analyze the distribution of brine and sediment can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 This is a connection diagram of the brine exhaust manifold of the utility model;

[0019] Figure 3 yes Figure 2 A top view schematic diagram of

[0020] Figure 4 This is a connection diagram of the gas injection manifold (front) of the utility model;

[0021] Figure 5 It is a connection schematic diagram of the gas injection manifold (back side) of the utility model.

[0022] In the figure: 1. frame, 2. horizontal shaft, 3. vertical shaft, 4. sealing plate, 5. manual water outlet valve, 6. pressure relief valve, 7. manual water inlet valve, 8. plug, 9. brine discharge main pipe, 10. brine discharge solenoid valve, 11. brine discharge bypass pipe, 12. manual brine discharge valve, 13. gland, 14. main air intake valve, 15. air intake sub-valve A, 16. air intake sub-valve B, 17. Y-type connector, 18. air intake main pipe, 19. vortex street sensor, 20. manual bypass valve. DETAILED DESCRIPTION

[0023] The gas injection and brine removal experimental device is composed of a frame 1, a transparent horizontal shaft 2, a vertical shaft 3, a sealing plate 4, a brine removal manifold and a gas injection manifold. The frame 1 is provided with a horizontal shaft 2 to pass through the horizontal shaft 2 in the doomsday salt cavern. The two ends of the horizontal shaft 2 are respectively connected to the vertical shaft 3 to simulate the vertical shaft in the salt cavern through the vertical shaft 3, and then the entire salt cavern is simulated through the vertical shaft 3 and the horizontal shaft 2. A sealing plate 4 is provided on the top port of the vertical shaft 3 to seal the top of the vertical shaft 3 through the sealing plate 4, thereby simulating the closed environment of the underground salt cavern. The sealing plate 4 and the central top of the horizontal shaft 2 are respectively connected to the brine discharge manifolds, so as to discharge the brine in the horizontal shaft 2 and the vertical shaft 3 through the brine discharge manifolds, thereby simulating the brine discharge process from the salt cavern. By observing the flow of brine and sediment in the vertical shaft 3, the horizontal shaft 2 and the brine discharge manifolds and the crystallization of the brine, the brine discharge process is analyzed, and the process of brine discharge from the salt cavern is theoretically analyzed through simulation experiments, thereby providing theoretical technical support for the process of brine discharge from the salt cavern, and optimizing the process of brine discharge from the salt cavern, which is more conducive to brine discharge from the salt cavern. The sealing plate 4 on one side of the brine discharge manifold is connected to the gas injection manifold, so as to inject gas into the vertical shaft 3 through the gas injection manifold to increase pressure. On the one hand, the high-pressure environment in the underground salt cavern is simulated by pressurization, and on the other hand, the brine is discharged by gas injection and pressurization, thereby simulating the gas injection and brine discharge process in the salt cavern.

[0024] A manual water outlet valve 5 is connected to the bottom of the horizontal well 2 to drain the water and sediment in the horizontal well 2 and the vertical well 3, thereby facilitating the flushing of the horizontal well 2 and the vertical well 3, and thus facilitating the replacement of the brine and sediment in the vertical well 3 and the horizontal well 2, thereby regulating the concentration of the brine and the composition and proportion of the sediment to ensure the accuracy of the experimental results.

[0025] A pressure relief valve 6 is connected to the sealing plate 4 of the vertical shaft 3 on one side of the horizontal shaft 2, so as to relieve the pressure of the vertical shaft 3 through the pressure relief valve 6, thereby facilitating water injection into the vertical shaft 3, and at the same time, the vertical shaft 3, the sealing plate 4, and the horizontal shaft 2 are safely disassembled after the pressure relief is completed. A manual water inlet valve 7 is provided on the sealing plate 4 of the vertical shaft 3 on the other side of the horizontal shaft 2, so as to input brine into the vertical shaft 3 through the manual water inlet valve 7. Plugs 8 are respectively provided on the sealing plates 4 of the vertical shaft 3 on both sides of the horizontal shaft 2, so as to connect the inside of the vertical shaft 3 with the outside after removing the plugs 8, thereby avoiding the pressure inside the vertical shaft 3 during the water injection process, thereby facilitating water injection into the vertical shaft 3.

[0026] The brine discharge manifold is composed of a brine discharge main pipe 9, a brine discharge solenoid valve 10, a brine discharge bypass pipe 11 and a manual brine discharge valve 12. The brine discharge main pipe 9 is provided with a brine discharge solenoid valve 10 to control the on and off of the brine discharge main pipe 9 through the brine discharge solenoid valve 10, thereby controlling the brine discharge process. The brine discharge main pipes 9 on both sides of the brine discharge solenoid valve 10 are connected with brine discharge bypass pipes 11, and the brine discharge bypass pipes 11 are provided with manual brine discharge valves 12. The function of the manual brine discharge valve 12 is to open the brine discharge bypass pipe 11 through the manual brine discharge valve 12, so that when the brine discharge main pipe 9 at the brine discharge solenoid valve 10 is blocked or the brine discharge solenoid valve 10 needs to be maintained and replaced, the brine is discharged through the brine discharge bypass pipe 11. The end of the brine discharge main pipe 9 extends into the horizontal shaft 2 or the vertical shaft 3, and the brine discharge main pipe 9 is sealed and connected to the sealing plate 4 or the horizontal shaft 2 through the gland 13.

[0027] The gas injection manifold includes an air intake main valve 14, an air intake sub-valve A15 and an air intake sub-valve B16 arranged in parallel, and the inlet end of the air intake sub-valve A15, the inlet end of the air intake sub-valve B16 and the outlet end of the air intake sub-valve B16 are respectively connected with a Y-type joint 17. The inlet end of the air intake sub-valve A15 is connected to the Y-type joint 17 connected to the inlet end of the air intake sub-valve B16 and the outlet end of the air intake main valve 14 through the Y-type joint 17, and the inlet end of the air intake main valve 14 is connected to the gas source through the air intake main pipe 18; the outlet end of the air intake sub-valve A15 is connected to the sealing plate 4 of the vertical shaft 3 on one side of the horizontal shaft 2; the outlet end of the air intake sub-valve B16 is connected to the sealing plate 4 of the vertical shaft 3 on the other side of the horizontal shaft 2 through the Y-type joint 17. The Y-type joint 17 connected to the inlet end of the air intake sub-valve B16 is also connected to the Y-type joint 17 on the outlet end of the air intake sub-valve B16 through the manual bypass valve 20. The function of the manual bypass valve 20 is to inject gas into the vertical shaft 3 through the manual bypass valve 20 when the air intake sub-valve A15 and the air intake sub-valve B16 are damaged, so as to ensure the gas injection into the vertical shaft 3.

[0028] A vortex sensor 19 for monitoring gas flow, pressure and temperature is provided between the main air inlet valve 14 and the Y-type connector 17. The vortex sensor 19 monitors the gas flow, temperature and pressure data input into the shaft 3, thereby controlling the gas injection.

[0029] During the experiment of the gas injection and brine removal experimental device, the vertical shaft 3 and the horizontal shaft 2 are disassembled, and the sediment material is filled in the vertical shaft 3 and the horizontal shaft 2. After the filling is completed, the vertical shaft 3 and the horizontal shaft 2 are connected, and the plug 8 on the sealing plate 4 is removed to connect the inside of the vertical shaft 3 with the outside. After the plug 3 is removed, the water source is connected to the manual water inlet valve 7 through a water pump, and the manual water inlet valve 7 is opened to inject brine into the vertical shaft 3 through the water pump. After the brine is injected to the set liquid level, the plug 8 is installed to close the sealing plate 4. After the plug is installed, the main air inlet valve 14, the air inlet valve A15 and the air inlet valve B16 are opened in sequence to inject air into the vertical shaft 3 for pressurization. After a period of pressurized air injection, the brine discharge solenoid valve 10 on the brine discharge main pipe 9 connected to the vertical shaft 3 sealing plate 4 and the horizontal shaft 2 is opened to discharge the brine. During the brine discharge process, the flow and distribution of brine and sediment are observed, and the crystallization of brine in the brine discharge main pipe 9 is observed at the same time.

[0030] The gas injection brine removal experimental device can simulate salt caverns through the horizontal shaft 2 and the vertical shaft 3, and simulate the process of gas injection brine removal through the brine removal manifold and the gas injection manifold. During the gas injection brine removal process, the crystallization of brine in the brine removal manifold can be observed, as well as the distribution and flow of brine and sediment in the vertical shaft 3 and the horizontal shaft 2. Through simulation experiments and theoretical analysis, theoretical technical support can be provided for salt cavern brine removal, and the brine removal operation of the salt cavern can be better performed, and the probability of blockage caused by brine crystallization during the brine removal process can be reduced. The problem that there is no theoretical technical support in the current salt cavern brine removal process, resulting in a high probability of brine crystallization and the inability to analyze the distribution of brine and sediment can be solved.

Claims

1. A gas injection and brine removal experimental device, comprising a frame (1), a transparent horizontal shaft (2), a vertical shaft (3), a sealing plate (4), a brine removal manifold and a gas injection manifold, Features: A horizontal shaft (2) is arranged on the frame (1); both ends of the horizontal shaft (2) are respectively connected to the vertical shaft (3); a sealing plate (4) is arranged on the top port of the vertical shaft (3); the sealing plate (4) and the central top of the horizontal shaft (2) are respectively connected to a brine discharge manifold; and the sealing plate (4) on one side of the brine discharge manifold is connected to a gas injection manifold.

2. A gas injection and brine removal experimental device according to claim 1, Features: A manual water outlet valve (5) is connected to the bottom of the horizontal well (2).

3. The gas injection and brine removal experimental device according to claim 1, Features: A pressure relief valve (6) is connected to the sealing plate (4) of the vertical shaft (3) on one side of the horizontal shaft (2), and a manual water inlet valve (7) is arranged on the sealing plate (4) of the vertical shaft (3) on the other side of the horizontal shaft (2); plugs (8) are respectively arranged on the sealing plates (4) of the vertical shafts (3) on both sides of the horizontal shaft (2).

4. The gas injection and brine removal experimental device according to claim 1, Features: The brine discharge manifold is composed of a brine discharge main pipe (9), a brine discharge solenoid valve (10), a brine discharge bypass pipe (11) and a manual brine discharge valve (12); the brine discharge main pipe (9) is provided with a brine discharge solenoid valve (10); the brine discharge main pipes (9) on both sides of the brine discharge solenoid valve (10) are connected to the brine discharge bypass pipes (11); and the brine discharge bypass pipes (11) are provided with a manual brine discharge valve (12); the end of the brine discharge main pipe (9) extends into the horizontal shaft (2) or the vertical shaft (3); the brine discharge main pipe (9) is sealedly connected to the sealing plate (4) or the horizontal shaft (2) through a gland (13).

5. The gas injection and brine removal experimental device according to claim 1, Features: The gas injection manifold comprises a main air intake valve (14), a sub-air intake valve A (15) and a sub-air intake valve B (16) arranged in parallel; the inlet end of the sub-air intake valve A (15) is connected to the Y-type joint (17) connected to the inlet end of the sub-air intake valve B (16) and the outlet end of the main air intake valve (14) through a Y-type joint (17), respectively; the inlet end of the main air intake valve (14) is connected to the gas source through an air intake main pipe (18); the outlet end of the sub-air intake valve A (15) is connected to the sealing plate (4) of the vertical shaft (3) on one side of the horizontal shaft (2); the outlet end of the sub-air intake valve B (16) is connected to the sealing plate (4) of the vertical shaft (3) on the other side of the horizontal shaft (2) through a Y-type joint (17).

6. A gas injection and brine removal experimental device according to claim 5, Features: A vortex sensor (19) for monitoring gas flow, pressure and temperature is provided between the main air intake valve (14) and the Y-type connector (17).

7. The gas injection and brine removal experimental device according to claim 5, Features: The Y-shaped connector (17) connected to the inlet end of the air intake valve B (16) is also connected to the Y-shaped connector (17) on the outlet end of the air intake valve B (16) via a manual bypass valve (20).

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