Scale inhibitor filling system applied to salt cavern type gas storage brine mining and cavity making

Abstract

The utility model discloses an antisludging agent filling system applied to a salt cavern type gas storage brine mining cavity, which comprises a clear water inlet pipeline, a water inlet pipeline, a brine output pipeline, an unsaturated brine tank water inlet pipeline and an unsaturated brine inlet pipeline, and the clear water inlet pipeline and the unsaturated brine inlet pipeline are connected in parallel and then converge to the water inlet pipeline; an outlet of the water inlet pipeline is respectively connected to a brine output pipeline and an unsaturated brine tank water inlet pipeline, and the unsaturated brine tank water inlet pipeline is communicated to the unsaturated brine water inlet pipeline; the inlet section of the water inlet pipeline is further communicated with a scale inhibitor filling tank, a scale inhibitor filling device and a scale inhibitor filling control valve, and a scale inhibitor stored in the scale inhibitor filling tank can be injected into the water inlet pipeline after being pressurized and subjected to flow control. The device is simple in structure, salt deposition and scaling phenomena of ground equipment and facilities and pipelines of the ground equipment and facilities are greatly relieved, the risk of brine leakage is reduced, the service life of a mechanical sealing piece is prolonged, and the brine extraction cavity forming efficiency and quality of the brine extraction well are improved.

Description

Technical Field

[0001] This utility model relates to the field of cavity construction technology for salt cavern gas storage, specifically to a scale inhibitor injection system applied to cavity construction of salt cavern gas storage. Background Technology

[0002] The current surface process for creating cavities in salt cavern gas storage facilities is as follows: Fresh water first enters the freshwater tank, then is pressurized by an injection pump to the high-pressure valve assembly, and distributed to each brine extraction well via high-pressure pipelines. Brine returning from the extraction wells flows back to the low-pressure valve assembly via low-pressure pipelines. After being tested by a brine concentration detection device, saturated brine is either injected into the brine tank or transported out of the brine tank, while unsaturated brine is recirculated back into the extraction wells through the freshwater tank and injection pump channels for reuse. In the brine extraction and cavity creation process of the aforementioned salt cavern gas storage facility, unsaturated brine contains Ca... 2+ Mg 2+ This often leads to salt and scale buildup in unsaturated brine as it flows through surface equipment and pipelines. These surface equipment typically include high-pressure injection pumps, high-pressure valve assemblies, brine wells, low-pressure valve assemblies, and their connecting pipelines. Salt and scale buildup in these equipment and pipelines can cause internal leaks due to valves not being able to close completely.

[0003] Currently, in the conventional brine extraction and cavity-building process of salt cavern gas storage facilities, scale inhibitor injection devices are only installed at the inlet end of the brine export pump, addressing the scale formation phenomenon in brine at salt chemical plants, while neglecting the aforementioned ground equipment systems. This leads to severe salt and scale buildup on the ground equipment and pipelines between the clear water tank, unsaturated brine tank, and export pipeline section. Problem 1: Fluid in the high-pressure valve group cannot flow to the designated brine extraction well, affecting the brine extraction and cavity-building effect; Problem 2: Salt and scale buildup causes equipment seal failure, resulting in brine leakage, environmental pollution, and failure to meet environmental protection requirements; Problem 3: Frequent replacement of high-pressure water injection pump mechanical seals, high-pressure valve group valves, and other equipment increases maintenance and labor costs and delays the brine extraction and cavity-building schedule. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a scale inhibitor injection system for use in the cavity construction of salt cavern gas storage facilities, so as to prevent the calcium in the unsaturated brine from rising during the brine extraction and cavity construction process of salt cavern gas storage facilities. 2+ Mg 2+ Salt and scale buildup.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a scale inhibitor injection system applied to brine extraction and cavity creation in a salt cavern gas storage facility, comprising a clean water inlet pipeline, an inlet pipeline, a brine export pipeline, an unsaturated brine tank inlet pipeline, and an unsaturated brine inlet pipeline, wherein the clean water inlet pipeline and the unsaturated brine inlet pipeline are connected in parallel and converge to the inlet of the inlet pipeline; the outlet of the inlet pipeline is connected to the brine export pipeline and the unsaturated brine tank inlet pipeline respectively via a tee, and the unsaturated brine tank inlet pipeline is then connected to the unsaturated brine inlet pipeline; the inlet section of the above-mentioned inlet pipeline is connected to and installed with a scale inhibitor injection pipeline, the scale inhibitor injection pipeline comprising a scale inhibitor injection tank, a scale inhibitor injection device, and a scale inhibitor injection control valve, wherein the scale inhibitor injection device is used to pressurize the scale inhibitor stored in the scale inhibitor injection tank and inject it into the inlet pipeline.

[0006] Furthermore, the aforementioned clean water inlet pipeline includes a clean water inlet, a clean water tank, a control valve, and connecting pipes thereof;

[0007] The aforementioned water inlet pipeline includes a high-pressure water injection pump, a high-pressure valve group, a brine extraction well, a low-pressure valve group, and corresponding control valves and connecting pipelines connected in sequence. A brine concentration detection device is also installed on the connecting pipeline at the outlet end of the low-pressure valve group.

[0008] The aforementioned brine export pipeline includes brine export pumps, salt plants, and corresponding pipelines;

[0009] The unsaturated brine tank inlet pipeline mentioned above is equipped with an inlet control valve for the unsaturated brine tank.

[0010] The aforementioned unsaturated brine inlet pipeline includes an unsaturated brine tank and an outlet pipeline. One end of the outlet pipeline is connected to the drain port of the unsaturated brine tank, and the other end is connected to the inlet pipeline. An outlet control valve is also installed on the outlet pipeline.

[0011] Furthermore, the clean water inlet pipeline and the unsaturated brine inlet pipeline are connected to the inlet of the inlet pipeline via a tee; the fluid flowing into the inlet of the inlet pipeline can be either the fluid discharged from the clean water inlet pipeline, the fluid discharged from the unsaturated brine inlet pipeline, or a mixture of the fluids discharged from the clean water inlet pipeline and the unsaturated brine inlet pipeline.

[0012] Furthermore, the control valves in the clean water inlet pipeline include an inlet control valve and a clean water tank outlet control valve, which are respectively installed on the connecting pipeline between the clean water inlet and the clean water tank, and between the clean water tank and the inlet pipeline;

[0013] The inlet connection pipe of the high-pressure water injection pump in the water inlet pipeline is equipped with a high-pressure water injection pump inlet control valve, and its outlet connection pipe is equipped with a high-pressure water injection pump outlet control valve.

[0014] A brine export control valve is installed on the inlet pipe of the brine export pump in the brine export pipeline.

[0015] Furthermore, the high-pressure valve group, brine well, and low-pressure valve group are all provided in multiple sets. The high-pressure valve group is used to adjust the flow direction of the liquid pipeline so that the fluid flows into the designated brine well for brine extraction and cavity creation. The low-pressure valve group is used to adjust the flow direction of the pipeline and then merge into the main pipe. Each high-pressure valve group has at least one electromagnetic flowmeter and at least one control valve.

[0016] Furthermore, the brine concentration detection device, when detecting a brine concentration higher than a set value, opens the brine export pipeline control valve and closes the unsaturated brine tank inlet pipe control valve, allowing the brine to be pressurized by the brine export pump in the brine export pipeline and discharged to the salt plant for concentration into salt; when detecting a brine concentration lower than a set value, it opens the unsaturated brine tank inlet pipe control valve and closes the brine export pipeline control valve, allowing the brine to flow into the unsaturated brine tank through the delivery pipe of the unsaturated brine tank inlet pipeline.

[0017] Furthermore, the connection between the aforementioned connecting pipelines is achieved through a flange sealing and fixing connection.

[0018] Furthermore, the scale inhibitor filling device is equipped with a solar photovoltaic panel and an energy storage module, which provide a power source for the scale inhibitor filling device through electrical connection.

[0019] Furthermore, the brine concentration detection device is signal-connected to the scale inhibitor dosing device, which can automatically adjust the dosing amount of scale inhibitor according to the brine concentration.

[0020] Compared with existing technologies, this utility model has the following beneficial effects: The utility model has a simple structure and, for the first time, proposes connecting a scale inhibitor injection device to the pipeline at the outlet of the clear water tank and unsaturated brine tank. This greatly alleviates the salt and scale buildup on ground equipment and pipelines, significantly extending the service life of the mechanical seals of the high-pressure water injection pump, reducing the frequency of mechanical seal replacement, and greatly reducing the risk of brine leakage from the high-pressure water injection pump. The valves of the high-pressure valve group and the low-pressure valve group can open and close normally, allowing fluid in the inlet pipeline to flow in and out of the designated brine well, improving the efficiency and quality of brine extraction and cavity formation. The inner wall of the electromagnetic flowmeter in the high-pressure valve group is no longer subject to salt and scale buildup, improving the measurement accuracy of the electromagnetic flowmeter and the accuracy of cavity volume measurement in the salt cavern gas storage facility. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure and flow of the brine extraction and scale inhibitor injection system for the salt cavern gas storage facility of this utility model.

[0022] Figure 2This is a schematic diagram of the brine outflow pipeline after the brine concentration is detected to be higher than the preset value after brine extraction and cavity creation according to this utility model.

[0023] Figure 3 This is a schematic diagram of the brine return pipeline through which the brine concentration is detected to be lower than the preset value after brine extraction and cavity creation according to this utility model.

[0024] In the diagram, the arrows indicate the direction of fluid flow;

[0025] 100. Clean water inlet pipeline; 200. Unsaturated brine inlet pipeline; 300. Inlet pipeline; 400. Brine export pipeline; 500. Unsaturated brine tank inlet pipeline.

[0026] 1. Clear water inlet; 2. Clear water tank; 3. Unsaturated brine tank; 4. Scale inhibitor filling tank; 5. Scale inhibitor filling device; 6. High-pressure water injection pump; 7. High-pressure valve group; 8. Brine well; 9. Low-pressure valve group; 10. Brine concentration detection device; 11. Brine export pump; 12. Salt plant; 101. Inlet control valve; 102. Clear water tank outlet control valve; 103. Unsaturated brine tank outlet control valve; 104. Scale inhibitor filling control valve; 105. High-pressure water injection pump inlet control valve; 106. High-pressure water injection pump outlet control valve; 107. High-pressure valve group control valve; 108. Electromagnetic flow meter; 109. Low-pressure valve group control valve; 110. Unsaturated brine tank inlet pipe control valve; 111. Brine export pipeline control valve. Detailed Implementation

[0027] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0029] like Figure 1As shown, a scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility includes a clean water inlet pipeline 100, an inlet pipeline 300, a brine export pipeline 400, an unsaturated brine tank inlet pipeline 500, and an unsaturated brine inlet pipeline 200. The clean water inlet pipeline 100 and the unsaturated brine inlet pipeline 200 are parallel pipelines, and their outlets are connected to the inlet of the inlet pipeline 300 via a three-way valve. Line 100 includes a clean water inlet 1, an inlet control valve 101, a clean water tank 2, and a clean water tank outlet control valve 102, which are connected sequentially through a connecting pipeline. The unsaturated brine inlet pipeline 200 includes an unsaturated brine tank 3 and an outlet pipeline. One end of the outlet pipeline is connected to the drain port of the unsaturated brine tank 3, and the other end is connected to the inlet pipeline 300 through the aforementioned three-way valve. An unsaturated brine tank outlet control valve 103 is also installed on the outlet pipeline.

[0030] The inlet pipeline 300 includes a high-pressure water injection pump 6, multiple high-pressure valve groups 7, multiple brine extraction wells 8, and multiple low-pressure valve groups 9, all connected sequentially via connecting pipes. The inlet connecting pipe of the high-pressure water injection pump 6 is equipped with a high-pressure water injection pump inlet control valve 105, and its outlet connecting pipe is equipped with a high-pressure water injection pump outlet control valve 106. The high-pressure valve groups 7 are used to adjust the fluid flow direction, allowing the fluid to flow into the designated brine extraction wells 8 for brine extraction and cavity creation. The low-pressure valve groups 9 are used to adjust their respective flow directions before converging into the main pipe of the same connecting pipeline. A brine concentration detection device 10 is installed on the connecting pipe at the outlet end of the low-pressure valve group 9 to monitor the Ca concentration in the outflowing fluid. 2+ Mg 2+ The concentration was measured.

[0031] Each of the above high-pressure valve groups 7 shall have at least one electromagnetic flowmeter 108 and one high-pressure valve group control valve 107; each of the low-pressure valve groups 9 shall have at least one low-pressure valve group control valve 109.

[0032] The outlet of the inlet pipeline 300 is connected to the brine export pipeline 400 and the unsaturated brine tank inlet pipeline 500 via a three-way valve. The brine export pipeline 400 includes a brine export pump 11, a salt plant 12, and pipelines for interconnection. A brine export pipeline control valve 111 is also installed on the inlet pipeline of the brine export pump 11. The outlet of the unsaturated brine tank inlet pipeline 500 is connected to the unsaturated brine tank 3 in the aforementioned unsaturated brine inlet pipeline 200, and an unsaturated brine tank inlet pipe control valve 110 is installed on its delivery pipeline.

[0033] A scale inhibitor filling pipeline is connected to the inlet section of the aforementioned water inlet pipeline 300. This pipeline is located upstream of the high-pressure water injection pump inlet control valve 105. The scale inhibitor filling pipeline includes a scale inhibitor filling tank 4, a scale inhibitor filling device 5 connected to it, and a scale inhibitor filling control valve 104. The scale inhibitor filling device 5 is mainly used to pressurize the scale inhibitor stored in the scale inhibitor filling tank 4 and inject it into the water inlet pipeline 300. The scale inhibitor filling device 5 also contains a solar photovoltaic panel and an energy storage module, which provide power to the scale inhibitor filling device 5 via electrical connection.

[0034] All the connecting pipelines and equipment in the above system are connected by flange sealing and fixing.

[0035] When the system is running, clean water enters the clean water tank 2 through the clean water inlet 1 and is stored thereafter via the inlet control valve 101. The flow rate is then controlled by the outlet control valve 102 before entering the inlet pipeline 300. After entering the inlet pipeline 300, the fluid is pressurized by the high-pressure injection pump 6 and flows sequentially into the high-pressure valve group 7, the brine extraction well 8, and the low-pressure valve group 9. After the fluid passes through the brine extraction well 8 to extract brine and create a cavity, the Ca in the fluid... 2+ Mg 2+ The concentration will increase significantly, and after the flow direction is adjusted by the low-pressure valve group 9, it flows into the subsequent manifold. The brine concentration detection device 10 on the manifold monitors it in real time. When the detected brine concentration exceeds the set value, such as... Figure 2 As shown, the brine export pipeline control valve 111 is opened, and the unsaturated brine tank inlet pipe control valve 110 is closed. After being pressurized by the brine export pump 11 in the brine export pipeline 400, it is discharged to the salt plant 12 for concentration into salt. When the brine concentration is detected to be lower than the set value, such as... Figure 3 As shown, the control valve 110 of the unsaturated brine tank inlet pipe is opened, and the control valve 111 of the brine outlet pipeline is closed. The brine flows into the unsaturated brine tank 3 through the delivery pipe of the unsaturated brine tank inlet pipeline 500 for storage. Subsequently, the unsaturated brine enters the inlet pipeline 300 after the flow rate is controlled by the unsaturated brine tank outlet control valve 103. Here, the type of fluid entering the inlet pipeline 300 can be adjusted according to actual production process requirements; it can be only the fluid discharged from the clean water inlet pipeline 100, only the fluid discharged from the unsaturated brine inlet pipeline 200, or a mixed fluid discharged from both the clean water inlet pipeline 100 and the unsaturated brine inlet pipeline 200. At this time, due to the Ca in the unsaturated brine... 2+ Mg 2+ The presence of scale will cause salt and scale formation in the high-pressure water injection pump 6, high-pressure valve group 7, brine well 8, low-pressure valve group 9 and their connecting pipelines within the inlet pipeline 300. Therefore, the scale inhibitor injection device 5 in the scale inhibitor injection pipeline is operated. After pressurization and flow rate control, the scale inhibitor is synchronously injected into the inlet pipeline 300 through the scale inhibitor injection control valve 104 to prevent scale formation.

[0036] The scale inhibitors mentioned above are made of environmentally friendly materials and do not affect the subsequent concentration and salting process at the salt plant 12.

[0037] In a further optimized technical solution, the brine concentration detection device 10 is also connected to the scale inhibitor dosing device 5 via a signal connection. The scale inhibitor dosing device 5 can automatically adjust the dosing amount of scale inhibitor according to the real-time transmission data of the brine concentration. The dosing speed of the scale inhibitor dosing device 5 and the monitored brine concentration have the following relationship: brine concentration * constant = dosing speed.

[0038] In addition, the aforementioned scale inhibitor injection pipeline can also be connected to the unsaturated brine return pipeline or the inlet pipeline of each pump, depending on the actual production process.

[0039] It should be noted that the aforementioned saturated brine specifically refers to brine with a concentration higher than the set value in the brine concentration detection device 10, and does not refer to a saturated solution dissolved in water in the chemical field; the aforementioned unsaturated brine refers to brine with a concentration lower than the set value in the brine concentration detection device 10.

[0040] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility, characterized in that: The system includes a clean water inlet pipeline, an inlet pipeline, a brine export pipeline, an unsaturated brine tank inlet pipeline, and an unsaturated brine inlet pipeline. The clean water inlet pipeline and the unsaturated brine inlet pipeline are connected in parallel and converge at the inlet of the inlet pipeline. The outlet of the inlet pipeline is connected to the brine export pipeline and the unsaturated brine tank inlet pipeline via a tee. The unsaturated brine tank inlet pipeline is then connected to the unsaturated brine inlet pipeline. The inlet section of the aforementioned inlet pipeline is connected to a scale inhibitor injection pipeline. The scale inhibitor injection pipeline includes a scale inhibitor injection tank, a scale inhibitor injection device, and a scale inhibitor injection control valve. The scale inhibitor injection device is used to pressurize the scale inhibitor stored in the scale inhibitor injection tank and inject it into the inlet pipeline.

2. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 1, characterized in that: The aforementioned clean water inlet pipeline includes a clean water inlet, a clean water tank, a control valve, and connecting pipes; The aforementioned water inlet pipeline includes a high-pressure water injection pump, a high-pressure valve group, a brine extraction well, a low-pressure valve group, and corresponding control valves and connecting pipelines connected in sequence. A brine concentration detection device is also installed on the connecting pipeline at the outlet end of the low-pressure valve group. The aforementioned brine export pipeline includes brine export pumps, salt plants, and corresponding pipelines; The unsaturated brine tank inlet pipeline mentioned above is equipped with an inlet control valve for the unsaturated brine tank. The aforementioned unsaturated brine inlet pipeline includes an unsaturated brine tank and an outlet pipeline. One end of the outlet pipeline is connected to the drain port of the unsaturated brine tank, and the other end is connected to the inlet pipeline. An outlet control valve is also installed on the outlet pipeline.

3. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 2, characterized in that: The clean water inlet pipeline and the unsaturated brine inlet pipeline are connected to the inlet of the inlet pipeline via a tee; the fluid flowing into the inlet of the inlet pipeline can be either the fluid discharged from the clean water inlet pipeline, the fluid discharged from the unsaturated brine inlet pipeline, or a mixture of the fluids discharged from the clean water inlet pipeline and the unsaturated brine inlet pipeline.

4. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 2, characterized in that: The control valves in the clean water inlet pipeline include an inlet control valve and a clean water tank outlet control valve, which are respectively installed on the connecting pipelines between the clean water inlet and the clean water tank, and between the clean water tank and the inlet pipeline. The inlet connection pipe of the high-pressure water injection pump in the water inlet pipeline is equipped with a high-pressure water injection pump inlet control valve, and its outlet connection pipe is equipped with a high-pressure water injection pump outlet control valve. A brine export control valve is installed on the inlet pipe of the brine export pump in the brine export pipeline.

5. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 2, characterized in that: The high-pressure valve group, brine well, and low-pressure valve group are all equipped with multiple sets. The high-pressure valve group is used to adjust the flow direction of the liquid pipeline so that the fluid flows into the designated brine well for brine extraction and cavity creation. The low-pressure valve group is used to adjust the flow direction of the pipeline and then merge into the main pipe. Each high-pressure valve group has at least one electromagnetic flow meter and at least one control valve.

6. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 4, characterized in that: When the brine concentration detection device detects a brine concentration higher than the set value, it opens the brine export pipeline control valve and closes the unsaturated brine tank inlet pipe control valve. The brine is then pressurized by the brine export pump in the brine export pipeline and discharged to the salt plant for concentration into salt. When the brine concentration detects a brine concentration lower than the set value, it opens the unsaturated brine tank inlet pipe control valve and closes the brine export pipeline control valve. The brine then flows into the unsaturated brine tank through the delivery pipe of the unsaturated brine tank inlet pipeline.

7. A scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to any one of claims 1 to 6, characterized in that: The connection between the above-mentioned connecting pipelines is a fixed connection through flange sealing.

8. The scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 1, characterized in that: The scale inhibitor filling device is equipped with a solar photovoltaic panel and an energy storage module, which provide a power source for the scale inhibitor filling device through electrical connection.

9. A scale inhibitor injection system for brine extraction and cavity creation in a salt cavern gas storage facility according to claim 2, characterized in that: The brine concentration detection device is connected to the scale inhibitor dosing device, which can automatically adjust the amount of scale inhibitor added according to the brine concentration.

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