Sand production prevention and control method for injection and production well of compressed air energy storage reservoir

Abstract

The invention belongs to the technical field of salt cavern energy storage, and discloses a sand production prevention and control method for an injection-production well of a compressed air energy storage reservoir. During sand production prevention and control, firstly, detection equipment is used for detecting the interior of a salt cavern cavity, the internal space is divided into a plurality of sand production sections, various tracer agent coatings are sprayed to the sand production sections one by one, injection-production production is carried out, the sand production position is judged according to the types of the tracer agent coatings contained in solid particles collected in a sand production collection device, and the sand production position is judged according to the types of the tracer agent coatings contained in the sand production collection device. And setting the corresponding sand production intervals as prevention and control intervals, blowing the prevention and control intervals, and spraying a plurality of curing agents onto the prevention and control intervals one by one, so as to realize sand production prevention and control. When the method is used for sand production prevention and control of the salt cavern cavity, sand production can be effectively prevented and controlled, injection-production production equipment and production pipelines are prevented from being blocked due to sand production of solid particles, meanwhile, the circulation of injection-production gas can be prevented from being restricted, and the working efficiency of injection-production production is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of salt cavern energy storage technology, and in particular to a method for controlling sand production in injection and production wells of compressed air energy storage. Background Technology

[0002] Compressed air storage in salt caverns is an energy storage technology that uses electricity to compress air and inject it into the salt cavern cavity. During peak electricity demand periods, the compressed air can be extracted to drive a generator, and the electricity can be fed back into the power grid to meet the regulation needs of the power system. During the salt cavern construction stage, insoluble particles from the salt rock layer fall and accumulate at the bottom of the salt cavern cavity, forming sediment deposits. These insoluble particles tend to form ring-shaped deposits at the neck section of the salt cavern cavity (i.e., the connection between the salt cavern cavity and the injection-production well).

[0003] During injection and production, air disturbance can cause insoluble particles to impact the injection and production tubing walls, damaging the tubing and potentially leading to serious safety accidents. Furthermore, some insoluble particles can be carried by the air into surface production pipelines, causing blockages and affecting production. Therefore, sand control is necessary for salt cavern compressed air energy storage systems during injection and production. Current technology typically involves installing a sand-proof pipe with perforated screens at the lower end of the injection and production tubing. During injection and production, air can pass through these perforations while insoluble particles are intercepted, thus controlling sand release. However, using this method for sand control in salt cavern compressed air energy storage systems often requires relatively small perforations to ensure effectiveness. This can restrict the flow of injection gas, reducing the efficiency of compressed air energy storage. Furthermore, increasing the perforation size to improve gas flow would render the sand-proof pipe ineffective in blocking insoluble particles.

[0004] Therefore, there is an urgent need to provide a method for controlling sand production in injection and production wells of compressed air energy storage systems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for controlling sand production in injection and production wells of compressed air energy storage, which can effectively control sand production and prevent blockage of injection and production equipment and pipelines due to solid particles. At the same time, it can also avoid restricting the flow of injection and production gas and ensure the working efficiency of injection and production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for controlling sand production in injection and production wells of compressed air energy storage is provided, comprising the following steps:

[0008] S1. Use a detection device to detect the inner contour of the salt cavern cavity and the accumulation surface of the sediment at the bottom of the salt cavern cavity, divide the interior of the salt cavern cavity and the sediment surface into multiple sand discharge zones, and calculate the surface area of ​​multiple sand discharge zones in sequence.

[0009] S2. Estimate the amount of tracer coating required for each sand-producing section based on the surface area of ​​the multiple sand-producing sections, and lower the spraying and purging device into the salt cavern through the injection-production well. Control the spraying and purging device to spray the multiple tracer coatings onto the multiple sand-producing sections in multiple times. The multiple tracer coatings correspond one-to-one with the multiple sand-producing sections.

[0010] S3. Remove the spraying and purging device from the injection-production well and set the injection-production tubing string inside the injection-production well. Connect the production pipeline of the injection-production equipment to the injection-production tubing string. A sand collection device is installed on the production pipeline to collect solid particles discharged from the salt cavern during the injection-production process.

[0011] S4. Control the injection and production equipment to carry out injection and production until the preset production time is reached. Collect solid particles in the sand collection device, analyze how many types of tracer coatings are carried in the solid particles, divide the solid particles into multiple particle groups according to the type of tracer coating, calculate the proportion of multiple particle groups, detect the physical characteristics of the solid particles in multiple particle groups, determine which sand discharge interval each of the multiple particle groups comes from, and set the sand discharge intervals corresponding to the multiple particle groups as multiple control intervals.

[0012] S5. The spraying and purging device is lowered into the salt cavern cavity through the injection-production well again, and the spraying and purging device is controlled to spray gas sequentially from top to bottom onto the multiple control zones to purge the solid particles attached to the inner wall of the control zone.

[0013] S6. Based on the proportion of the multiple particle groups and the physical properties of the solid particles of the multiple particle groups, determine the curing agent applicable to any of the control zones, and control the spraying and purging device to spray the multiple curing agents onto the multiple control zones in multiple times, with the multiple curing agents corresponding one-to-one with the multiple control zones;

[0014] S7. Remove the spraying and purging device from the injection-production well, and control the injection-production production equipment to carry out injection-production production again until the preset production time is reached. Check whether the content of solid particles in the injection-production production equipment is less than the preset content. If not, proceed to S8; if yes, proceed to S9.

[0015] S8. Repeat steps S5 and S6, and return to step S7.

[0016] S9. End sand control operations.

[0017] Optionally, the spraying and purging device includes a storage container, an injection mechanism, a delivery pipeline, and a spraying assembly. The storage container is configured to selectively store the liquid or gas to be sprayed. One end of the delivery pipeline is connected to the storage container and can extend into the injection-production well. The injection mechanism is disposed on the delivery pipeline. The spraying assembly is rotatably disposed about one end of the delivery pipeline away from the storage container and is connected to the delivery pipeline. The spraying assembly can spray the tracer coating into the sand-producing zone and can spray gas or spray the curing agent into the control zone.

[0018] Optionally, the spraying assembly includes a first spraying section, a second spraying section, and a third spraying section arranged vertically in sequence. Each of the first, second, and third spraying sections includes a connecting pipe and a plurality of spraying components. The plurality of spraying components of the first spraying section are connected to the side wall of the corresponding connecting pipe at a first preset angle. The plurality of spraying components of the second spraying section are connected to the side wall of the corresponding connecting pipe at a second preset angle. The plurality of spraying components of the third spraying section are arranged in a spherical, spaced ring around the lower end of the corresponding connecting pipe. The connecting pipes of the first, second, and third spraying sections are connected in sequence, and the connecting pipe of the first spraying section is connected to the conveying pipe.

[0019] Optionally, the plurality of sand discharge zones are arranged sequentially from top to bottom, and the plurality of sand discharge zones include a cavity neck zone, a cavity wall zone, and a sediment surface zone. Step S2 specifically includes the following steps:

[0020] S21. Estimate the amount of the sprayed tracer coating required for each section based on the surface area of ​​the cavity neck section, the cavity wall section, and the sediment surface section;

[0021] S22. Extend the delivery pipeline into the injection-production well so that the spraying assembly is lowered into the salt cavern cavity;

[0022] S23. Store the tracer coating corresponding to the cavity neck section in the storage container, adjust the vertical position of the spraying assembly so that the first spraying part is directly opposite the cavity neck section, and control the spraying part of the first spraying part to spray the tracer coating onto the inner wall surface of the cavity neck section at the first preset angle and preset spraying pressure.

[0023] S24. The tracer coating corresponding to the cavity wall section is stored in the storage container. The cavity wall section includes the top wall section and the side wall section. The vertical position of the spraying assembly is adjusted so that the second spraying part is directly opposite the top wall section of the cavity. The spraying part of the second spraying part is controlled to spray the tracer coating onto the inner wall surface of the top wall section of the cavity at the second preset angle and the preset spraying pressure.

[0024] S25. Adjust the vertical position of the spraying assembly so that the first spraying part is directly opposite the cavity side wall section, and control the spraying part of the first spraying part to spray the tracer coating onto the inner wall surface of the cavity side wall section at the first preset angle and the preset spraying pressure.

[0025] S26. The tracer coating corresponding to the sediment surface area is stored in the storage container, and the spraying part of the third spraying unit is controlled to spray the tracer coating onto the upper surface of the sediment surface area at a preset angle range and the preset spraying pressure.

[0026] Optionally, after performing step S1 and before performing step S21, step S20 needs to be performed, and step S20 specifically includes the following steps:

[0027] S201. The spraying assembly is placed in the simulated cavity, and the test liquid is stored in the storage container. The inner contour of the simulated cavity is the same as that of the salt cavern cavity. The interior of the simulated cavity is divided into multiple simulated sections, analogous to the salt cavern cavity.

[0028] S202. Taking the uppermost simulated zone as an example, control the spraying part of the first spraying section corresponding to the simulated zone to be set at a preset tilt angle.

[0029] S203. Control the injection mechanism to deliver the test liquid to the spraying component of the first spraying part through the delivery pipe at a preset injection pressure, and control the spraying component to spray the test liquid onto the corresponding simulation area;

[0030] S204. Check the spraying effect of the simulated area and determine whether the simulated area has been completely sprayed. If not, proceed to S205; if yes, proceed to S206.

[0031] S205. Adjust the preset tilt angle of the sprayed part of the first spraying section and the preset injection pressure of the injection mechanism, and return to execute S203;

[0032] S206. Set the preset tilt angle of the currently sprayed part to the first preset angle, and the preset injection pressure is the preset spraying pressure.

[0033] Optionally, step S5 specifically includes the following steps:

[0034] S51. The spraying and purging device is lowered into the salt cavern cavity through the injection-production well again.

[0035] S52. The gas is stored in the storage container, and the spraying part of the second spraying part or the spraying part of the third spraying part is controlled to spray the gas sequentially from top to bottom onto the multiple control zones at a preset blowing angle and preset impact pressure to blow away the solid particles attached to the inner wall of the control zone.

[0036] Optionally, step S5 further includes the following steps:

[0037] S53. Lower the visualization device into the salt cavern cavity, control the visualization device to observe the inner wall surfaces of multiple control zones, and determine whether there are loose fixed particles attached to the inner wall surfaces of the control zones based on the observation results. If yes, execute S54; otherwise, execute S6.

[0038] S54. Repeat step S52 and return to step S53.

[0039] Optionally, the preset purging angle is 60° to 80°, and the preset impact pressure is 0.1 MPa to 0.5 MPa.

[0040] Optionally, step S6 specifically includes the following steps:

[0041] S61. Establish a dosage prediction model, and successively substitute the surface area and solid particle distribution rate of the multiple control zones into the dosage prediction model, and calculate the amount of curing agent required for each of the multiple control zones.

[0042] S62. Control the spraying and purging device to sequentially spray the various curing agents onto the multiple prevention and control zones, wherein the various curing agents correspond one-to-one with the multiple prevention and control zones, and the amount of each curing agent is the same as its calculated amount.

[0043] Optionally, the plurality of control zones are arranged sequentially from top to bottom, and the plurality of control zones include a cavity neck zone, a cavity wall zone, and a sediment surface zone. Step S62 specifically includes the following steps:

[0044] S621. Store the curing agent corresponding to the cavity neck section in the storage container, adjust the vertical position of the spraying assembly so that the first spraying part is directly opposite the cavity neck section, and control the spraying part of the first spraying part to spray the curing agent onto the inner wall surface of the cavity neck section at the first preset angle and preset spraying pressure.

[0045] S622. The curing agent corresponding to the cavity wall section is stored in the storage container. The cavity wall section includes the top wall section and the side wall section. The vertical position of the spraying assembly is adjusted so that the second spraying part is directly opposite the top wall section of the cavity. The spraying part of the second spraying part is controlled to spray the curing agent onto the inner wall surface of the top wall section of the cavity at the second preset angle and the preset spraying pressure.

[0046] S623. Adjust the vertical position of the spraying assembly so that the first spraying part is directly opposite the cavity side wall section, and control the spraying part of the first spraying part to spray the curing agent onto the inner wall surface of the cavity side wall section at the first preset angle and the preset spraying pressure.

[0047] S624. The curing agent corresponding to the sediment surface area is stored in the storage container, and the spraying part of the third spraying unit is controlled to spray the curing agent onto the upper surface of the sediment surface area at the preset angle range and the preset spraying pressure.

[0048] The beneficial effects of this invention are:

[0049] This invention provides a method for controlling sand production in injection and production wells of compressed air energy storage systems. By spraying various tracer coatings onto different sand production zones within a salt cavern, solid particles within each zone can be labeled. Solid particles emitted during injection and production operations are then collected and analyzed. Based on the type of tracer coating, the solid particles are divided into multiple particle groups. The proportion of each group is calculated, and the physical characteristics of the solid particles in each group are tested. Each particle group corresponds to a sand production zone, thus identifying the origin of the solid particles and determining the sand production location within the salt cavern. This provides a reliable basis for analyzing the sand production mechanism and controlling sand production. The method involves further spraying and blowing... The purging device blows through multiple control zones, causing solid particles adhering to their inner walls to fall to the bottom of the salt cavern. Then, based on the proportion of multiple particle groups and the physical properties of the solid particles, the appropriate curing agent is determined for each control zone. The spraying and purging device is controlled to spray multiple curing agents onto the control zones in stages, ensuring that the solid particles within each control zone are effectively cured on the inner wall, guaranteeing a fixation effect. Using this sand-out control method to treat solid particles within the salt cavern effectively controls sand outflow, preventing blockage of injection and production equipment and pipelines due to solid particle outflow. It also avoids restricting the flow of injection and production gas, ensuring the efficiency of injection and production. Attached Figure Description

[0050] Figure 1 This is a flowchart of the method for controlling sand production in injection and production wells of compressed air energy storage provided in an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the sand-producing intervals divided into a single salt cavern cavity, as provided in an embodiment of the present invention.

[0052] Figure 3 This is a schematic diagram of the sand-discharging intervals divided by multiple salt cavern cavities provided in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of the spraying and purging device provided in this embodiment of the invention when performing spraying and purging operations on a single salt cavern cavity;

[0054] Figure 5 This is a schematic diagram of the structure of the spraying and purging device provided in this embodiment of the invention when performing spraying and purging operations on multiple salt caverns;

[0055] Figure 6 This is a schematic diagram of the structure of a single salt cavern cavity during injection and extraction production, provided in an embodiment of the present invention.

[0056] Figure 7 This is a schematic diagram of the structure of the spraying assembly provided in an embodiment of the present invention.

[0057] In the picture:

[0058] 1. Salt cavern cavity;

[0059] 2. Sand discharge zone; 21. Cavity neck zone; 22. Cavity wall zone; 221. Top wall zone of the cavity; 222. Side wall zone of the cavity; 23. Sludge surface zone;

[0060] 3. Spraying and purging device; 31. Storage container; 32. Injection mechanism; 33. Conveying pipeline; 34. Spraying assembly; 341. First spraying section; 3411. Connecting pipe; 3412. Sprayed part; 342. Second spraying section; 343. Third spraying section;

[0061] 4. Injection-production wells;

[0062] 5. Injection and production tubing;

[0063] 6. Injection and extraction production equipment;

[0064] 7. Production pipelines;

[0065] 8. Sand collection device. Detailed Implementation

[0066] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0067] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0070] This embodiment provides a method for controlling sand production in injection and production wells of compressed air energy storage systems, such as... Figures 1 to 7 As shown, using this sand control method to remove solid particles from the salt cavern cavity 1 can effectively control sand production, preventing blockage of the injection and production equipment 6 and production pipeline 7 caused by solid particles. At the same time, it can also avoid restricting the flow of injection and production gas, ensuring the efficiency of injection and production.

[0071] The method for controlling sand production from injection and production wells in compressed air energy storage systems includes the following steps:

[0072] S1, such as Figures 1 to 3 As shown, the inner contour of the salt cavern 1 and the accumulation surface of the sediment at the bottom of the salt cavern 1 are detected using a detection device. The interior of the salt cavern 1 and the sediment surface are divided into multiple sand discharge zones 2, and the surface area of ​​multiple sand discharge zones 2 is calculated in sequence.

[0073] S2, such as Figure 1 , Figure 4 and Figure 5 As shown, the amount of tracer coating required for each sand-producing section is estimated based on the surface area of ​​the multiple sand-producing sections 2. The spraying and purging device 3 is lowered into the salt cavern cavity 1 through the injection-production well 4. The spraying and purging device 3 is controlled to spray multiple tracer coatings onto the multiple sand-producing sections 2 in multiple times. The multiple tracer coatings correspond one-to-one with the multiple sand-producing sections 2.

[0074] S3, such as Figure 1 and Figure 6 As shown, the spraying and purging device 3 is moved out of the injection-production well 4, and the injection-production tubing 5 is set in the injection-production well 4. The production pipeline 7 of the injection-production production equipment 6 is connected to the injection-production tubing 5. A sand collection device 8 is set on the production pipeline 7 to collect the solid particles discharged from the salt cavern cavity 1 during the injection-production process.

[0075] S4, such as Figure 1 and Figure 6As shown, the injection and production equipment 6 is controlled to carry out injection and production until the preset production time is reached. Solid particles in the sand collection device 8 are collected, and the types of tracer coatings carried in the solid particles are analyzed. The solid particles are divided into multiple particle groups according to the types of tracer coatings. The proportion of multiple particle groups is calculated, and the physical characteristics of the solid particles in multiple particle groups are detected. It is determined which sand discharge interval 2 each particle group comes from, and the sand discharge interval 2 corresponding to multiple particle groups is set as multiple control intervals.

[0076] S5, such as Figure 1 , Figure 4 and Figure 5 As shown, the spraying and purging device 3 is lowered into the salt cavern cavity 1 through the injection-production well 4 again, and the spraying and purging device 3 is controlled to spray gas sequentially from top to bottom onto multiple control zones to purge the solid particles attached to the inner wall of the control zone.

[0077] S6, such as Figure 1 , Figure 4 and Figure 5 As shown, based on the proportion of multiple particle groups and the physical properties of the solid particles in multiple particle groups, the appropriate curing agent for any control zone is determined, and the spraying and purging device 3 is controlled to spray multiple curing agents onto multiple control zones in multiple times, with each curing agent corresponding to one of the multiple control zones.

[0078] S7, such as Figure 1 and Figure 6 As shown, the spraying and purging device 3 is moved out of the injection-production well 4, and the injection-production production equipment 6 is controlled again to carry out injection-production production until the preset production time is reached. Check whether the content of solid particles in the injection-production production equipment 6 is less than the preset content. If not, execute S8; if yes, execute S9.

[0079] S8, such as Figure 1 As shown, repeat steps S5 and S6, and return to execute step S7;

[0080] S9, such as Figure 1 As shown, the sand control operation has ended.

[0081] When controlling sand discharge from a salt cavern compressed air energy storage facility, it is necessary to first determine the location of the sand discharge so as to carry out targeted control measures at that location. When determining the sand-producing location, the inner contour of the salt cavern 1 and the surface of the sediment accumulated at the bottom of the salt cavern 1 are first detected using detection equipment, thus obtaining the inner contour map of the salt cavern 1 and the contour map of the sediment surface. Then, the interior of the salt cavern 1 and the sediment surface are divided into multiple sand-producing zones 2, and the surface area of ​​each sand-producing zone 2 is calculated sequentially. Based on the surface area of ​​each sand-producing zone 2, the amount of tracer coating to be sprayed onto each sand-producing zone 2 is estimated, thus avoiding resource waste and saving costs. Next, the spraying and purging device 3 is lowered into the salt cavern 1 through the injection-production well 4. Multiple tracer coatings are added to the spraying and purging device 3 in stages, and the spraying and purging device 3 sprays the multiple tracer coatings onto the multiple sand-producing zones 2 in multiple stages. Each tracer coating corresponds one-to-one with a sand-producing zone 2; that is, one type of tracer coating is sprayed onto one sand-producing zone 2 at a time. A tracer coating is sprayed onto each sand-producing section 2. The tracer coatings used for the multiple sand-producing sections 2 are different from each other. After all sand-producing sections 2 have been sprayed, the spraying and purging device 3 is removed from the injection-production well 4, and an injection-production string 5 connected to the production pipeline 7 of the injection-production equipment 6 is installed in the injection-production well 4. Then, the injection-production production work begins. As the injection-production production proceeds, the solid particles in the salt cavern 1 will be discharged into the production pipeline 7 with the gas and collected by the sand-producing collection device 8 on the production pipeline 7. When the injection-production production work reaches the preset production time, production is stopped, and the solid particles in the sand-producing collection device 8 are collected. The solid particles are divided into multiple particle groups according to the type of tracer coating, the proportion of each particle group is calculated, and the physical characteristics of the solid particles in the multiple particle groups are detected to determine which sand-producing section 2 each particle group comes from, thereby determining the sand-producing location.

[0082] After determining the sand discharge location, sand discharge control operations are carried out. Multiple sand discharge zones 2 that discharge solid particles are designated as multiple control zones. Then, the spraying and purging device 3 is lowered into the salt cavern cavity 1 through the injection-production well 4. The spraying and purging device 3 is controlled to spray gas sequentially from top to bottom onto the multiple control zones, thereby blowing off the solid particles attached to the inner walls of the multiple control zones and causing them to fall to the bottom of the salt cavern cavity 1. Then, based on the proportion of multiple particle groups and the physical characteristics of the solid particles in the multiple particle groups, the appropriate curing agent for each control zone is determined. Then, multiple curing agents are added to the spraying and purging device 3 in multiple batches, and the spraying and purging device 3 sprays multiple curing agents onto the multiple control zones in multiple batches. The multiple curing agents correspond one-to-one with the multiple control zones. Then, the spraying and purging device 3 is removed from the injection-production well 4, and injection and production are carried out again until the preset production time. The content of solid particles in the injection-production equipment is checked. If it is greater than or equal to the preset content, the above operation is repeated, and the sand discharge control operation is carried out again. If it is less than the preset content, the sand discharge control operation is ended.

[0083] By spraying various tracer coatings onto different sand-emission zones 2 within the salt cavern cavity 1, solid particles within each zone 2 can be labeled. Solid particles discharged during the injection and production process are then collected and analyzed. Based on the type of tracer coating, the solid particles are divided into multiple particle groups. The proportion of each group is calculated, and the physical characteristics of the solid particles in each group are tested. Each particle group corresponds to a sand-emission zone 2, thus identifying which zones 2 the solid particles originate from. This allows for the determination of the sand-emission location within the salt cavern cavity 1, providing a reliable basis for analyzing the sand-emission mechanism and controlling sand emission. The spraying and purging device 3 is then used again to purge the multiple control zones. The solid particles adhering to the inner wall of the salt cavern cavity 1 are purged and fall to the bottom. Then, based on the proportion of multiple particle groups and the physical properties of the solid particles, the appropriate curing agent for each of the multiple control zones is determined. The spraying and purging device 3 is controlled to spray multiple curing agents onto the multiple control zones in multiple stages, which can make the solid particles in the multiple control zones better solidified on the inner wall surface, ensuring the fixing effect. Using this sand release control method to control the solid particles in the salt cavern cavity 1 can effectively control sand release and prevent the blockage of the injection and production equipment 6 and production pipeline 7 due to the release of solid particles. At the same time, it can also avoid restricting the flow of injection and production gas and ensure the working efficiency of injection and production.

[0084] For example, the detection device includes a sonar.

[0085] It should be noted that when the tracer coating is sprayed onto the sand outlet section 2, the solid particles located in the sand outlet section 2 will be marked by the tracer coating, and the physical characteristics of the solid particles detected include particle size, particle density, etc.

[0086] In this embodiment, the preset production time is 20 production cycles. After each 1 or 5 production cycles, the content of solid particles in the injection and production equipment is recorded until the preset production time is reached, at which point the content of solid particles in the injection and production equipment in the final state is recorded.

[0087] Optionally, such as Figure 4 , Figure 5 and Figure 7As shown, the spraying and purging device 3 includes a storage container 31, an injection mechanism 32, a delivery pipe 33, and a spraying assembly 34. The storage container 31 is configured to selectively store the liquid or gas to be sprayed. One end of the delivery pipe 33 is connected to the storage container 31, and the delivery pipe 33 can extend into the injection-production well 4. The injection mechanism 32 is disposed on the delivery pipe 33, and the spraying assembly 34 is rotatably disposed about the end of the delivery pipe 33 opposite to the storage container 31 and is connected to the delivery pipe 33. The spraying assembly 34 can spray tracer coating into the sand-producing zone 2 and can spray gas or spray curing agent into the control zone. When it is necessary to spray tracer coating into the sand discharge zone 2, the tracer coating to be sprayed is stored in the storage container 31. Then, the injection mechanism 32 is activated, and the tracer coating in the storage container 31 is injected into the spraying assembly 34 through the delivery pipe 33. Finally, the spraying assembly 34 sprays the tracer coating into the sand discharge zone 2. Similarly, when it is necessary to spray gas or apply curing agent into the control zone, the gas or curing agent is stored in the storage container 31 accordingly. In addition, the spraying assembly 34 can rotate vertically, allowing for rotating spraying of material into the sand discharge zone 2 or the control zone, ensuring uniform spraying.

[0088] For example, the injection mechanism 32 includes an injection pump.

[0089] Optionally, such as Figure 7 As shown, the spraying assembly 34 includes a first spraying section 341, a second spraying section 342, and a third spraying section 343 arranged vertically in sequence. Each of the first, second, and third spraying sections 341 and 342 includes a connecting pipe 3411 and a plurality of spraying elements 3412. The plurality of spraying elements 3412 of the first spraying section 341 are connected to the sidewall of their corresponding connecting pipe 3411 at a first preset angle. The plurality of spraying elements 3412 of the second spraying section 342 are connected to the sidewall of their corresponding connecting pipe 3411 at a second preset angle. The plurality of spraying elements 3412 of the third spraying section 343 are arranged in a spherical, spaced-apart ring around the lower end of their corresponding connecting pipe 3411. The connecting pipes 3411 of the first spraying section 341, the second spraying section 342, and the third spraying section 343 are sequentially connected, and the connecting pipe 3411 of the first spraying section 341 is connected to the conveying pipe 33. By controlling the spraying parts 3412 of each spraying section to be connected to the connecting pipe 3411 at a set angle or shape, it can be ensured that any corner inside the salt cavern 1 can be covered when spraying tracer coatings or curing agents, thus ensuring the spraying effect. This is beneficial for accurately determining the sand outlet position and ensuring the control effect on the sand outlet position.

[0090] Optionally, the first spraying section 341, the second spraying section 342, and the third spraying section 343 also include an angle detection element. The angle detection element is mounted on the connecting pipe 3411 and is used to detect the tilt angle of the sprayed component 3412. By providing the angle detection element, the tilt angle of the sprayed component 3412 can be monitored in real time, thereby helping to ensure the spraying effect when spraying tracer coatings or curing agents.

[0091] For example, the angle detection element includes an angle sensor.

[0092] In this embodiment, the first spraying section 341 is provided with two spraying parts 3412, the second spraying section 342 is provided with two spraying parts 3412, and the third spraying section 343 is provided with four spraying parts 3412. In other embodiments, each spraying section may be provided with other numbers of spraying parts 3412 as needed, which is not limited here.

[0093] For example, the sprayed part 3412 includes a nozzle.

[0094] Optionally, such as Figure 2 and Figure 3 As shown, multiple sand discharge zones 2 are arranged sequentially from top to bottom, and each sand discharge zone 2 includes a cavity neck zone 21, a cavity wall zone 22, and a sediment surface zone 23. Step S2 specifically includes the following steps:

[0095] S21. Estimate the amount of tracer coating required for each section based on the surface area of ​​the cavity neck section 21, the cavity wall section 22, and the sediment surface section 23.

[0096] S22. Extend the delivery pipe 33 into the injection-production well 4 so that the spraying assembly 34 can be lowered into the salt cavern 1;

[0097] S23. Store the tracer coating corresponding to the neck section 21 of the cavity in the storage container 31, adjust the vertical position of the spraying assembly 34 so that the first spraying part 341 is directly opposite the neck section 21 of the cavity, and control the spraying part 3412 of the first spraying part 341 to spray the tracer coating onto the inner wall surface of the neck section 21 of the cavity at a first preset angle and a preset spraying pressure.

[0098] S24. The tracer coating corresponding to the cavity wall section 22 is stored in the storage container 31. The cavity wall section 22 includes the top wall section 221 and the side wall section 222. The vertical position of the spraying assembly 34 is adjusted so that the second spraying part 342 is directly opposite the top wall section 221. The spraying part 3412 of the second spraying part 342 is controlled to spray the tracer coating onto the inner wall surface of the top wall section 221 of the cavity at a second preset angle and a preset spraying pressure.

[0099] S25. Adjust the vertical position of the spraying assembly 34 so that the first spraying part 341 is directly opposite the cavity side wall section 222, and control the spraying part 3412 of the first spraying part 341 to spray the tracer coating onto the inner wall surface of the cavity side wall section 222 at a first preset angle and preset spraying pressure.

[0100] S26. The tracer coating corresponding to the sediment surface area 23 is stored in the storage container 31, and the spraying part 3412 of the third spraying part 343 is controlled to spray the tracer coating onto the upper surface of the sediment surface area 23 at a preset angle range and a preset spraying pressure.

[0101] In this embodiment, the first preset angle is 80° to 90°, the second preset angle is 50° to 60°, the preset angle range is 30° to 150°, and the preset spraying pressure is 0.1MPa to 0.2MPa.

[0102] For example, the first preset angle is set to 90°, the second preset angle is set to 60°, the preset angle range is set to 30° to 150°, and the preset spraying pressure is 0.2MPa.

[0103] In this embodiment, the interior of the salt cavern 1 and the surface of the sediment are divided into three sand discharge zones 2, and these three sand discharge zones 2 are arranged from top to bottom as follows: the neck zone 21, the wall zone 22, and the sediment surface zone 23. When spraying multiple tracer coatings, the neck section 21 of the cavity is sprayed first. The spraying part 3412 of the first spraying part 341 is controlled to spray the tracer coating onto the inner wall surface of the neck section 21 of the cavity at a first preset angle and a preset spraying pressure. The cavity wall section 22 includes the top wall section 221 and the side wall section 222. The inner wall surface of the top wall section 221 gradually increases vertically. Therefore, the tracer coating is sprayed by the second spraying part 342 at a second preset angle and a preset spraying pressure. The side wall section 222 is sprayed by the first spraying part 341 at a first preset angle and a preset spraying pressure. The sediment surface section 23 located at the bottom of the salt cavern cavity 1 is sprayed by the spraying part 3412 of the third spraying part 343, which is spherically connected, at a preset angle range and a preset spraying pressure. By applying tracer coatings to multiple sand outlet sections 2 using different spraying parts 3412 and different spraying angles, it can be ensured that the spraying range of the spraying parts 3412 can cover all sand outlet sections 2, and it is also beneficial to ensure the uniformity of the sprayed tracer coating layer.

[0104] For example, the tracer coating used in the neck region 21 of the cavity is a sulfide phosphor, the tracer coating used in the wall region 22 of the cavity is a fluorescein-based phosphor, and the tracer coating used in the sediment surface region 23 is a coumarin derivative phosphor.

[0105] Optionally, step S20 needs to be executed after step S1 and before step S21. Step S20 specifically includes the following steps:

[0106] S201. The spraying component 34 is placed in the simulation cavity, and the test liquid is stored in the storage container 31. The inner contour of the simulation cavity is the same as that of the salt cavern cavity 1. The interior of the simulation cavity is divided into multiple simulation intervals, similar to the salt cavern cavity 1.

[0107] S202. Taking the uppermost simulation zone as an example, control the spraying part 3412 of the first spraying section 341 corresponding to the simulation zone to be set at a preset tilt angle.

[0108] S203. The injection mechanism 32 is controlled to deliver the test liquid through the delivery pipe 33 to the spraying part 3412 of the first spraying part 341 at a preset injection pressure, and the spraying part 3412 is controlled to spray the test liquid onto the corresponding simulation area.

[0109] S204. Check the spraying effect of the simulated area and determine whether the simulated area has been completely sprayed. If not, proceed to S205; if yes, proceed to S206.

[0110] S205. Adjust the preset tilt angle of the sprayed part 3412 of the first spraying section 341 and the preset injection pressure of the injection mechanism 32, and return to execute S203.

[0111] S206. Set the preset tilt angle of the current sprayed part 3412 to the first preset angle, and set the preset injection pressure to the preset spraying pressure.

[0112] Before spraying the tracer coating onto the sand outlet section 2, the spraying assembly 34 is first placed inside the simulation chamber, which has the same inner contour as the salt cavern chamber 1. Taking the uppermost simulation section as an example (i.e., the neck section 21 of the salt cavern chamber 1), the injection mechanism 32 is controlled to a preset injection pressure, and the spraying part 3412 of the first spraying unit 341 is controlled to spray the test liquid onto the simulation section at a preset tilt angle. The spraying effect is checked. If the simulation section is not completely covered, the tilt angle is adjusted and spraying is repeated until the simulation section is completely covered. Then, the tilt angle of the spraying part 3412 of the first spraying unit 341 can be set as the first preset angle. The test process for other simulation sections is similar. By testing the spraying effect in advance, the tilt angle of each spraying part 3412 can be determined, thereby avoiding spraying errors.

[0113] Optionally, step S200 is performed after step S1 and before step S201. Step S200 specifically includes the following steps:

[0114] S200. Lower the visualization device into the salt cavern 1, control the visualization device to observe the state of solid particles in multiple sand outlet sections 2, and predict the distribution range of sand outlet locations based on the observation results.

[0115] By using visualization equipment to observe multiple sand discharge zones 2, the morphology of solid particles within each sand discharge zone 2 can be obtained more intuitively. Based on the observation results, the distribution range of the sand discharge location can be predicted, which is beneficial for accurately determining the sand discharge location.

[0116] Optionally, step S5 specifically includes the following steps:

[0117] S51, such as Figure 4 and Figure 5 As shown, the spraying and purging device 3 is lowered into the salt cavern cavity 1 through the injection-production well 4 again;

[0118] S52. The gas is stored in the storage container 31. The spraying part 3412 of the second spraying part 342 or the spraying part 3412 of the third spraying part 343 is controlled to spray the gas sequentially from top to bottom to multiple control zones at a preset blowing angle and preset impact pressure to blow away the solid particles attached to the inner wall of the control zone.

[0119] By using the spraying and blowing device 3 to blow the inner wall of the control zone, the loose solid particles can fall and accumulate at the bottom of the cavity, avoiding the phenomenon of sand discharge caused by spraying too much curing agent on the wall but still failing to fix the loose particles.

[0120] Optionally, step S5 further includes the following steps:

[0121] S53. Lower the visualization device into the salt cavern 1, control the visualization device to observe the inner wall surface of multiple control zones, and determine whether there are loose fixed particles attached to the inner wall surface of the control zone based on the observation results. If yes, execute S54; otherwise, execute S6.

[0122] S54. Repeat step S52 and return to step S53.

[0123] By using visualization equipment to observe the inner walls of multiple control zones, the purging results can be detected, preventing loose solid particles from adhering to the inner walls of the control zones and thus preventing sand discharge.

[0124] In this embodiment, the preset purging angle is 60° to 80°, and the preset impact pressure is 0.1MPa to 0.5MPa.

[0125] For example, the preset purging angle is set to 60° and the preset impact pressure is 0.1MPa.

[0126] Optionally, step S6 specifically includes the following steps:

[0127] S61. Establish a usage prediction model, substitute the surface area and solid particle distribution rate of multiple control zones into the usage prediction model in sequence, and calculate the amount of curing agent required for each of the multiple control zones.

[0128] S62. Control the spraying and purging device 3 to spray multiple curing agents sequentially onto multiple control zones. Each curing agent corresponds to one control zone, and the amount of each curing agent used is the same as its calculated amount.

[0129] By establishing a usage prediction model, the required amount of curing agent can be calculated in advance, which can not only avoid resource waste and save costs, but also ensure that the curing agent sprayed on each control zone can completely cure the solid particles on its inner wall, ensuring the fixation effect of solid particles and preventing solid particles from being released into sand during injection and extraction production.

[0130] It should be noted that the number of control zones is the same as the number of particle groups, and the larger the proportion of particle groups, the stronger the curing effect of the curing agent used in the corresponding control zone.

[0131] In this embodiment, the dosage prediction model is a dynamic curing agent dosage prediction algorithm based on a BP neural network. When calculating the amount of curing agent, parameters such as the surface area of ​​the control zone, the particle coverage rate of the control zone (i.e., the density of solid particles per unit area), the temperature of the salt cavern 1, the moisture content of the sediment, and the salt concentration in the salt cavern 1 need to be substituted into the prediction algorithm to calculate the amount of curing agent.

[0132] Optionally, such as Figure 2 and Figure 3 As shown, multiple control zones are arranged sequentially from top to bottom, and these zones include the cavity neck zone 21, the cavity wall zone 22, and the sediment surface zone 23. Step S62 specifically includes the following steps:

[0133] S621. Store the curing agent corresponding to the cavity neck section 21 in the storage container 31, adjust the vertical position of the spraying assembly 34 so that the first spraying part 341 is directly opposite the cavity neck section 21, and control the spraying part 3412 of the first spraying part 341 to spray the curing agent onto the inner wall surface of the cavity neck section 21 at a first preset angle and preset spraying pressure.

[0134] S622. The curing agent corresponding to the cavity wall section 22 is stored in the storage container 31. The cavity wall section 22 includes the top wall section 221 and the side wall section 222. The vertical position of the spraying assembly 34 is adjusted so that the second spraying part 342 is directly opposite the top wall section 221. The spraying part 3412 of the second spraying part 342 is controlled to spray the curing agent onto the inner wall surface of the top wall section 221 at a second preset angle and a preset spraying pressure.

[0135] S623. Adjust the vertical position of the spraying assembly 34 so that the first spraying part 341 is directly opposite the cavity side wall section 222, and control the spraying part 3412 of the first spraying part 341 to spray the curing agent onto the inner wall surface of the cavity side wall section 222 at a first preset angle and preset spraying pressure.

[0136] S624. The curing agent corresponding to the sediment surface area 23 is stored in the storage container 31, and the spraying part 3412 of the third spraying part 343 is controlled to spray the curing agent onto the upper surface of the sediment surface area 23 at a preset angle range and a preset spraying pressure.

[0137] When spraying the curing agent, the same spraying method as when spraying the tracer coating is used to sequentially spray different curing agents onto the cavity neck section 21, the cavity wall section 22, and the sediment surface section 23. First, the neck section 21 of the cavity is sprayed. The spraying part 3412 of the first spraying part 341 is controlled to spray the curing agent onto the inner wall surface of the neck section 21 of the cavity at a first preset angle and a preset spraying pressure. The cavity wall section 22 includes the top wall section 221 and the side wall section 222. The inner wall surface of the top wall section 221 gradually increases vertically. Therefore, the curing agent is sprayed by the second spraying part 342 at a second preset angle and a preset spraying pressure. The side wall section 222 is sprayed by the first spraying part 341 at a first preset angle and a preset spraying pressure. The sediment surface section 23 located at the bottom of the salt cavern cavity 1 is sprayed by the spraying part 3412 of the third spraying part 343, which is spherically connected, at a preset angle range and a preset spraying pressure. By applying curing agent to multiple sand outlet sections 2 using different spraying parts 3412 and different spraying angles, it can be ensured that the spraying range of the spraying part 3412 can cover all sand outlet sections 2, and it is beneficial to ensure the uniformity of the sprayed curing agent layer.

[0138] For example, the curing agent used in the neck section 21 of the cavity is modified epoxy resin, the curing agent used in the wall section 22 of the cavity is expanded perlite-based coating, and the curing agent used in the sediment surface section 23 is porous silicon-based curing agent.

[0139] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sand control method for injection and production wells of compressed air energy storage reservoirs, characterized in that, The method comprises the following steps: S1, using a detection device to detect the profile of a salt cavern cavity (1) and the accumulation surface of the bottom sediment of the salt cavern cavity (1), dividing the inside of the salt cavern cavity (1) and the sediment surface into a plurality of sand production intervals (2), and sequentially calculating the surface area of each sand production interval (2); S2, estimating the amount of tracer paint required for each interval according to the surface area of each sand production interval (2), lowering a spraying and blowing device (3) into the salt cavern cavity (1) through an injection and production well (4), and controlling the spraying and blowing device (3) to spray a plurality of types of tracer paint onto a plurality of sand production intervals (2) in multiple times, wherein the plurality of types of tracer paint correspond to the plurality of sand production intervals (2) one by one; S3, moving the spraying and blowing device (3) out of the injection and production well (4), setting an injection and production pipe column (5) in the injection and production well (4), connecting a production pipeline (7) of an injection and production production device (6) with the injection and production pipe column (5), and setting a sand production collecting device (8) on the production pipeline (7) to collect solid particles discharged from the salt cavern cavity (1) during injection and production; S4, controlling the injection and production production device (6) to perform injection and production until a preset production time is reached, collecting the solid particles in the sand production collecting device (8), analyzing the types of tracer paint carried by the solid particles, dividing the solid particles into a plurality of particle groups according to the types of tracer paint, calculating the proportion of each particle group, detecting the physical properties of the solid particles in each particle group, determining which sand production interval (2) each particle group comes from, and setting the sand production intervals (2) corresponding to each particle group as a plurality of control intervals; S5, lowering the spraying and blowing device (3) into the salt cavern cavity (1) through the injection and production well (4) again, and controlling the spraying and blowing device (3) to spray gas onto the plurality of control intervals from top to bottom in sequence to blow off the solid particles adhered to the inner wall surface of the control intervals; S6, determining the suitable solidifying agent for any control interval according to the proportion of each particle group and the physical properties of the solid particles in each particle group, controlling the spraying and blowing device (3) to spray a plurality of types of solidifying agent onto the plurality of control intervals in multiple times, wherein the plurality of types of solidifying agent correspond to the plurality of control intervals one by one; S7, moving the spraying and blowing device (3) out of the injection and production well (4), and controlling the injection and production production device (6) to perform injection and production again until the preset production time is reached, checking whether the content of solid particles in the injection and production production device (6) is less than a preset content, if not, performing S8, and if yes, performing S9; S8, repeating steps S5 and S6, and returning to perform step S7; S9, ending the sand production control operation.

2. The sand control method of claim 1, wherein, The spraying blowing device (3) comprises a storage container (31), an injection mechanism (32), a conveying pipeline (33) and a spraying assembly (34), the storage container (31) is configured to selectively store a liquid or gas to be sprayed, one end of the conveying pipeline (33) is in communication with the storage container (31), and the conveying pipeline (33) can extend into the injection well (4), the injection mechanism (32) is arranged on the conveying pipeline (33), the spraying assembly (34) is arranged vertically rotatably on one end of the conveying pipeline (33) away from the storage container (31) and in communication with the conveying pipeline (33), the spraying assembly (34) can spray the tracer coating to the sand-out interval (2) and can spray gas or the solidifying agent to the prevention and control interval.

3. The sand control method of claim 2, wherein, The spraying assembly (34) comprises a first spraying part (341), a second spraying part (342) and a third spraying part (343) arranged in sequence in the vertical direction, the first spraying part (341), the second spraying part (342) and the third spraying part (343) each comprise a connecting pipe (3411) and a plurality of spraying pieces (3412), the plurality of spraying pieces (3412) of the first spraying part (341) are connected to the side wall of the corresponding connecting pipe (3411) at a first preset angle, the plurality of spraying pieces (3412) of the second spraying part (342) are connected to the side wall of the corresponding connecting pipe (3411) at a second preset angle, the plurality of spraying pieces (3412) of the third spraying part (343) are arranged in a spherical shape and spaced around the lower end of the corresponding connecting pipe (3411), the connecting pipes (3411) of the first spraying part (341), the second spraying part (342) and the third spraying part (343) are in communication in sequence, and the connecting pipe (3411) of the first spraying part (341) is in communication with the conveying pipeline (33).

4. The sand control method of claim 3, wherein, A plurality of the sand-out intervals (2) are arranged in sequence from top to bottom, and the plurality of the sand-out intervals (2) comprise a cavity neck interval (21), a cavity wall interval (22) and a sediment surface interval (23), and the step S2 specifically comprises the following steps: S21, estimating the amount of the spraying tracer coating required by each interval according to the surface area of the cavity neck interval (21), the cavity wall interval (22) and the sediment surface interval (23); S22, extending the conveying pipeline (33) into the injection well (4) so as to lower the spraying assembly (34) into the salt cavern cavity (1); S23, the cavity neck interval (21) corresponding tracer paint storage in the storage container (31), adjust the vertical position of the spraying assembly (34) to make the first spraying part (341) and the cavity neck interval (21) opposite, control the spraying part (3412) of the first spraying part (341) to spray the tracer paint to the inner wall surface of the cavity neck interval (21) at the first preset angle and the preset spraying pressure; S24, the cavity wall interval (22) corresponding tracer paint is stored in the storage container (31), the cavity wall interval (22) includes cavity top wall interval part (221) and cavity side wall interval part (222), adjust the vertical position of the spraying assembly (34) to make the second spraying part (342) and the cavity top wall interval part (221) opposite, control the spraying part (3412) of the second spraying part (342) to spray the tracer paint to the inner wall surface of the cavity top wall interval part (221) at the second preset angle and the preset spraying pressure; S25, adjust the vertical position of the spraying assembly (34) to make the first spraying part (341) and the cavity side wall interval part (222) opposite, control the spraying part (3412) of the first spraying part (341) to spray the tracer paint to the inner wall surface of the cavity side wall interval part (222) at the first preset angle and the preset spraying pressure; S26, the tracer paint corresponding to the sediment surface interval (23) is stored in the storage container (31), and the spraying part (3412) of the third spraying part (343) is controlled to spray the tracer paint to the upper surface of the sediment surface interval (23) at a preset angle range and the preset spraying pressure.

5. The sand control method of claim 4, wherein, After the step S1 is executed and before the step S21 is executed, a step S20 also needs to be executed, and the step S20 specifically includes the following steps: S201, the spraying assembly (34) is arranged in a simulation cavity, and a test liquid is stored in the storage container (31), the simulation cavity is the same as the inner contour of the salt cave cavity (1), and the inside of the simulation cavity is divided into a plurality of simulation intervals in analogy with the salt cave cavity (1); S202, taking the uppermost simulation interval as an example, the spraying part (3412) of the first spraying part (341) corresponding to the simulation interval is arranged at a preset inclination angle; S203, the injection mechanism (32) is controlled to transport the test liquid to the spraying part (3412) of the first spraying part (341) through the conveying pipeline (33) at a preset injection pressure, and the spraying part (3412) is controlled to spray the test liquid to the corresponding simulation interval; S204, check the spraying effect of the simulation interval, and determine whether the simulation interval is completely sprayed, if not, execute S205, if yes, execute S206; S205, adjust the preset inclination angle of the spraying member (3412) of the first spraying part (341) and the preset injection pressure of the injection mechanism (32), and return to execute S203; S206, set the preset inclination angle of the current spraying member (3412) as the first preset angle, and set the preset injection pressure as the preset spraying pressure.

6. The sand control method of claim 3, wherein, The step S5 specifically comprises the following steps: S51, again lower the spraying and blowing device (3) into the salt cavern cavity (1) through the injection and production well (4); S52, store gas in the storage container (31), and control the spraying member (3412) of the second spraying part (342) or the spraying member (3412) of the third spraying part (343) to spray gas at a preset blowing angle and a preset impact pressure from top to bottom on multiple control intervals in sequence to blow off the solid particles adhered to the inner wall surface of the control interval.

7. The sand control method of claim 6, wherein, The step S5 further comprises the following steps: S53, lower a visualization device into the salt cavern cavity (1), control the visualization device to observe the inner wall surface of multiple control intervals, and determine whether loose fixed particles are adhered to the inner wall surface of the control interval according to the observation result, if yes, execute S54, and if no, execute S6; S54, repeat step S52, and return to execute step S53.

8. The sand control method of claim 6, wherein, The preset blowing angle is 60°-80°, and the preset impact pressure is 0.1-0.5 MPa.

9. The sand control method of claim 4, wherein, The step S6 specifically comprises the following steps: S61, establish a dosage prediction model, sequentially substitute the surface area and solid particle distribution rate of multiple control intervals into the dosage prediction model, and calculate the required dosage of curing agent for each of multiple control intervals; S62, control the spraying and blowing device (3) to spray multiple curing agents onto multiple control intervals in sequence, and multiple curing agents correspond to multiple control intervals one by one, and the dosage of each curing agent is the same as the calculated dosage.

10. The sand control method of claim 9, wherein, Multiple control intervals are arranged from top to bottom in sequence, and multiple control intervals comprise a cavity neck interval (21), a cavity wall surface interval (22), and a sediment surface interval (23), and the step S62 specifically comprises the following steps: S621, store the curing agent corresponding to the cavity neck interval (21) in the storage container (31), adjust the vertical position of the spraying assembly (34) to make the first spraying part (341) face the cavity neck interval (21), and control the spraying member (3412) of the first spraying part (341) to spray the curing agent onto the inner wall surface of the cavity neck interval (21) at the first preset angle and the preset spraying pressure; S622, store the curing agent corresponding to the cavity wall surface interval (22) in the storage container (31), the cavity wall surface interval (22) includes a cavity top wall surface interval part (221) and a cavity side wall surface interval part (222), adjust the vertical position of the spraying assembly (34) to make the second spraying part (342) opposite to the cavity top wall surface interval part (221), control the spraying part (3412) of the second spraying part (342) to spray the curing agent on the inner wall surface of the cavity top wall surface interval part (221) at the second preset angle and the preset spraying pressure; S623, adjust the vertical position of the spraying assembly (34) to make the first spraying part (341) opposite to the cavity side wall surface interval part (222), control the spraying part (3412) of the first spraying part (341) to spray the curing agent on the inner wall surface of the cavity side wall surface interval part (222) at the first preset angle and the preset spraying pressure; S624, store the curing agent corresponding to the sediment surface interval (23) in the storage container (31), control the spraying part (3412) of the third spraying part (343) to spray the curing agent on the upper surface of the sediment surface interval (23) at the preset angle range and the preset spraying pressure.

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