Salt cavern gas storage chamber bottom residue cleaning device and cleaning method

Abstract

This invention relates to the field of salt cavern gas storage cavity construction technology, specifically to a device and method for cleaning residue at the bottom of a salt cavern gas storage cavity. The device includes a tubing column, a slag extraction pipe, an annular jet pump, connecting pipes, and high-pressure nozzles. Two of the connecting pipes are in an open and closed state. When the connecting pipes sink into the brine, they are in the open state, forming a channel between them for the annular jet pump to extract the residue. By installing high-pressure nozzles at the bottom ends of the connecting pipes on both sides of the bottom end of the tubing column, and by allowing the two connecting pipes to be in both open and closed states, when the two connecting pipes are in the open state, a channel for the jet pump to extract the residue is formed between them. This allows an annular jet pump with a larger slag extraction diameter to be coaxially mounted at the bottom end of the tubing column, increasing the diameter of the slag extraction channel. Furthermore, when the connecting pipes are in the open state, the high-pressure nozzles have a larger flushing and breaking range.

Description

Technical Field

[0001] This invention relates to the technical field of cavity-making equipment for salt cavern gas storage, and more specifically to a device and method for cleaning residue at the bottom of a salt cavern gas storage cavity. Background Technology

[0002] Salt cavern gas storage facilities have advantages such as high injection-production rate, large short-term throughput, low cushion gas volume, and complete recovery, making them play a very important role in energy storage and peak shaving emergency response. They have now become one of the main means of natural gas storage. The underground engineering construction of salt cavern gas storage facilities includes three main processes: drilling, cavity construction, and gas injection and brine removal. After the cavity is constructed by dissolving rock salt, a large amount of insoluble matter will accumulate at the bottom of the cavity, occupying the space inside the cavity and reducing the storage capacity. Therefore, it is necessary to use jet flushing or drill bit crushing methods to break up the accumulated insoluble residue, and then use jet pumps to extract the broken residue.

[0003] Currently, the nozzles or drill bits for jet flushing are coaxially mounted on the tubing, which means that only side-suction jet pumps can be used to remove residues. However, the suction pipe of the side-suction jet pump has a small diameter, and the suction path of the residue has bends, which makes the diameter of the residue that can be sucked in small and easy to clog. Therefore, there is an urgent need for a residue cleaning device and cleaning method for the bottom of salt cavern gas storage to solve the above problems. Summary of the Invention

[0004] This invention proposes a device for cleaning residue at the bottom of a salt cavern gas storage tank, comprising:

[0005] The tubular column has a double-layer structure with an internal installation channel and a liquid supply channel;

[0006] The slag extraction pipe, coaxially installed inside the pipe column, is used to convey the residue upwards.

[0007] An annular jet pump is coaxially mounted at the first end of the slag extraction pipe and located outside the pipe column for extracting residue.

[0008] Two connecting pipes are located on both sides of the slag extraction pipe and are connected to the liquid supply channel inside the tubing column. The first end of each of the two connecting pipes is equipped with a high-pressure nozzle for spraying water to break up the residue.

[0009] The two connecting pipes have an open state and a closed state. When the connecting pipes sink into the brine, the two connecting pipes are in the open state, forming a channel between the two connecting pipes for the annular jet pump to extract residue and increasing the crushing range of the high-pressure nozzle. When the connecting pipes rise to completely detach from the brine, the two connecting pipes are in the closed state under the action of gravity, shortening the distance between the two connecting pipes.

[0010] Preferably, the slag extraction pipe has a double-layer structure, with an internal slag discharge channel for conveying residue upwards and a working fluid delivery channel for conveying working fluid.

[0011] Preferably, the annular jet pump includes a pump body, the pump body having an inlet channel and an inlet chamber inside, the inlet chamber being connected to the working fluid delivery channel through the inlet channel, the pump body having a set of circumferentially uniformly arranged diversion nozzles, the output direction of the diversion nozzles being towards the interior of the slag discharge channel and inclined upwards, the diversion nozzles being connected to the inlet chamber, and the pump body having a suction chamber, a throat, and a diffusion chamber sequentially arranged along the slag delivery direction inside.

[0012] Preferably, the annular jet pump further includes a set of circumferentially uniformly arranged backflush nozzles, the backflush nozzles being located below the guide nozzles, the output direction of the backflush nozzles facing the interior of the slag discharge channel and tilting downwards, the backflush nozzles communicating with the liquid inlet chamber, and a floating sealing ring sliding inside the liquid inlet chamber for controlling the opening and closing of the guide nozzles or the backflush nozzles.

[0013] Preferably, a control rod for adjusting the position of the floating sealing ring is fixed on the floating sealing ring.

[0014] Preferably, the second end of the connecting pipe is provided with a connecting hose, and the connecting pipe is connected to the liquid supply channel inside the tubing column through the connecting hose.

[0015] Preferably, each of the two connecting pipes has a float fixed at one end near the high-pressure nozzle. When the connecting pipe sinks into the brine, the two connecting pipes are in an open state under the buoyancy of the float.

[0016] Preferably, the second end of the connecting pipe is provided with a connecting hinge, so that the second end of the connecting pipe can be rotatably connected to the bottom end of the pipe column.

[0017] Preferably, the connecting hinge includes a lug, a connecting shaft, and a limiting plate. The first end of the lug is fixed to the column, the connecting shaft is rotatably connected to the second end of the lug, the second end of the connecting tube is fixedly connected to the connecting shaft, the limiting plate is fixed to the second end of the connecting tube, and the lug is provided with a limiting groove for limiting the swing range of the limiting plate, thereby limiting the swing range of the connecting tube.

[0018] The cleaning method of the above-mentioned salt cavern gas storage chamber bottom residue cleaning device includes the following steps:

[0019] S1. Equipment preparation: The tubing is connected to the drilling rig and lowered to the bottom of the salt cavern gas storage tank by the drilling rig. At this time, the connecting pipe is completely submerged in brine. Under the buoyancy of the float, the two connecting pipes are in an open state and are limited by the connecting hinge.

[0020] S2. Residue Crushing: The high-pressure water pumping equipment delivers high-pressure water sequentially through the liquid supply channel inside the tubing, the connecting hose, and the connecting pipe to the crushing nozzle. The water is then sprayed out through the crushing nozzle to crush the residue at the bottom of the salt cavern gas storage tank. At the same time, the drilling rig drives the tubing to rotate slowly, and the connecting pipe and the crushing nozzle rotate synchronously, so that the crushing area of ​​the two crushing nozzles forms a circular area.

[0021] S3. Residue Extraction: The working fluid pumping equipment sequentially delivers high-pressure working fluid along the working fluid delivery channel, the inlet channel, and the inlet chamber to the drainage nozzle, and then sprays it out through the drainage nozzle. At this time, when the high-pressure working fluid passes through the end face of the throat, its velocity can increase significantly, resulting in a significant decrease in pressure energy, thereby forming a negative pressure zone around the suction chamber to draw in the fluid. The drawn-in fluid and the power fluid are mixed through the throat and then diffused through the diffusion chamber to gradually restore the pressure energy. This pressure energy completes the upward delivery of the residue mixture, and then it is delivered to the ground through the slag discharge channel inside the slag extraction pipe.

[0022] S4. Blockage Removal: When a large piece of residue blocks the suction chamber, the residue cannot be extracted, and the flow rate inside the suction pipe decreases. When the flow rate decrease is detected by the flow monitoring device, the external telescopic hydraulic cylinder lifts the floating sealing ring upward through the control rod, causing the floating sealing ring to block the drainage nozzle. At this time, the working fluid in the inlet chamber is output through the backflush nozzle. The high-pressure working fluid flushes out the residue blocking the suction chamber, restoring the unobstructed flow of the suction chamber. Then, the telescopic hydraulic cylinder pushes the floating sealing ring downward through the control rod, causing the floating sealing ring to block the backflush nozzle. The working fluid in the inlet chamber is then output through the drainage nozzle.

[0023] S5. Slag Removal Completed: After slag removal is completed, the tubing and the slag removal pipe are lifted upward as a whole. The annular jet pump, the connecting pipe and the float rise synchronously. When the float leaves the brine, the two connecting pipes are closed under the action of gravity. The lateral space is small, which facilitates entry and exit through the wellhead of the salt cavern gas storage tank.

[0024] Compared with the prior art, the significant advantages of the method for cleaning residue at the bottom of the salt cavern gas storage chamber of the present invention are:

[0025] The present invention proposes a comprehensive solution for cleaning residue at the bottom of a salt cavern gas storage chamber. This solution involves installing high-pressure nozzles at the bottom ends of the connecting pipes on both sides of the bottom of the tubing column, allowing the two connecting pipes to be in both open and closed states. When the two connecting pipes are in the open state, a channel is formed between them for a jet pump to extract residue. This allows a large-diameter annular jet pump to be coaxially installed at the bottom of the tubing column, increasing the diameter of the extraction channel and enabling the extraction of larger residue particles, reducing the probability of blockage. Furthermore, when the connecting pipes are in the open state, the high-pressure nozzles have a large flushing and breaking range, achieving efficient and rapid cleaning of residue at the bottom of the gas storage chamber. Attached Figure Description

[0026] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0027] Figure 1 This is a schematic diagram of the structure of the salt cavern gas storage chamber bottom residue cleaning device provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the working state of the siphon nozzle of the annular jet pump in the salt cavern gas storage bottom residue cleaning device provided by the present invention.

[0029] Figure 3 This is a schematic diagram of the working state of the backflush nozzle of the annular jet pump in the salt cavern gas storage bottom residue cleaning device provided by the present invention.

[0030] Figure 4 yes Figure 1 Enlarged diagram of point A in the middle.

[0031] In the diagram, 10 is the tubing; 20 is the slag suction pipe; 201 is the slag discharge channel; 202 is the working fluid delivery channel; 30 is the annular jet pump; 301 is the liquid inlet channel; 302 is the liquid inlet chamber; 303 is the suction chamber; 304 is the throat; 305 is the diffusion chamber; 31 is the pump body; 32 is the diversion nozzle; 33 is the backflushing nozzle; 34 is the floating sealing ring; 341 is the control rod; 40 is the connecting pipe; 41 is the high-pressure nozzle; 42 is the connecting hose; 50 is the float; 60 is the connecting hinge; 601 is the limiting groove; 61 is the support lug; 62 is the connecting shaft; and 63 is the limiting plate. Detailed Implementation

[0032] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0033] In existing technologies, the nozzles or drill bits for jet flushing are coaxially mounted on the tubing, which means that only side-suction jet pumps can be used to remove residue. However, the suction pipe of the side-suction jet pump has a small diameter, and the suction path of the residue has bends, which makes the diameter of the residue that can be sucked up small and the residue is prone to clogging.

[0034] Combination Figure 1-4 The salt cavern gas storage chamber bottom residue cleaning device shown in the embodiment mainly includes a tubing 10, a slag extraction pipe 20, an annular jet pump 30, a connecting pipe 40, and a high-pressure nozzle 41.

[0035] It should be understood that drilling rigs, telescopic hydraulic cylinders, high-pressure water pumping equipment, and working fluid pumping equipment are generally installed on the ground of gas storage facilities. The drilling rig can drive the tubing string 10 to rotate and lift it out of the well or lower it to the bottom of the cavity. The telescopic hydraulic cylinder is used to control the up and down movement of the floating sealing ring 34 via the control rod 341 to block the backflushing nozzle 33 or the drainage nozzle 32. The high-pressure water pumping equipment pumps high-pressure water to the high-pressure nozzle 41, and then sprays it out through the high-pressure nozzle 41 to break up the residue.

[0036] The working fluid pumping equipment is used to pump the working fluid required by the annular jet pump 30 and to drain residue.

[0037] In an embodiment of the present invention, the tubing 10 has a double-layer structure, with an installation channel and a liquid supply channel inside.

[0038] The slag extraction pipe 20 is coaxially installed in the installation channel inside the pipe column 10 for conveying the residue upwards.

[0039] The annular jet pump 30 is coaxially mounted at the first end of the slag extraction pipe 20 and located outside the pipe column 10 for extracting residue.

[0040] As shown in the figure, the two connecting pipes 40 are located on both sides of the slag extraction pipe 20 and are connected to the liquid supply channel inside the pipe column 10. The first end of each of the two connecting pipes 40 is equipped with a high-pressure nozzle 41 for spraying water to break up the residue.

[0041] In this way, the drilling rig lowers the tubing 10, slag suction pipe 20, annular jet pump 30, connecting pipe 40 and high-pressure nozzle 41 to the bottom of the cavity. The high-pressure water pumping equipment pumps high-pressure water to the high-pressure nozzle 41, and then sprays it out through the high-pressure nozzle 41 to break up the residue.

[0042] During the crushing process, the drilling rig drives the pipe string 10 to rotate slowly, and the connecting pipe 40 and the high-pressure nozzle 41 rotate synchronously, so that the crushing area of ​​the two high-pressure nozzles 41 forms a circular area. The working fluid pumping equipment is used to pump the working fluid required by the annular jet pump 30 and guide the residue to the ground.

[0043] As illustrated in the diagram, the two connecting pipes 40 have open and closed states. When the connecting pipes 40 sink into the brine, they are in the open state, increasing the crushing range of the high-pressure nozzle 41 and creating a channel between the two connecting pipes 40 for the annular jet pump 30 to extract residue. The annular jet pump 30 has a large residue suction inlet diameter, which can guide larger particles of residue out and reduce the probability of blockage. When the connecting pipes 40 rise to completely detach from the brine, they close under the action of gravity, shortening the distance between the two connecting pipes 40. When the entire device is lifted or lowered, the connecting pipes 40 will not collide or interfere with the well wall.

[0044] Combination Figure 2 and Figure 3 As shown, the slag extraction pipe 20 has a double-layer structure, with a slag discharge channel 201 for conveying the slag upward and a working fluid delivery channel 202 for conveying the working fluid. The slag conveyed by the annular jet pump 30 rises to the ground through the slag discharge channel 201, while the working fluid used for guiding is delivered to the annular jet pump 30 through the working fluid delivery channel 202.

[0045] Combination Figure 2 and Figure 3 As shown, the annular jet pump 30 includes a pump body 31, and the pump body 31 is provided with an inlet channel 301 and an inlet chamber 302. The inlet chamber 302 is connected to the working fluid delivery channel 202 through the inlet channel 301.

[0046] During the cavity cleaning process, the working fluid pumping equipment delivers the working fluid sequentially through the working fluid delivery channel 202, the liquid inlet channel 301, and the liquid inlet chamber 302.

[0047] The pump body 31 is equipped with a set of circumferentially evenly arranged diversion nozzles 32, with the output direction of the diversion nozzles 32 facing the interior of the slag discharge channel 201 and inclined upward. The diversion nozzles 32 are connected to the liquid inlet chamber 302. Inside the pump body 31, along the slag conveying direction, there are sequentially arranged suction chamber 303, throat 304, and diffusion chamber 305. Thus, the working fluid is delivered to the diversion nozzles 32, sprayed out through the diversion nozzles 32, and conveyed upward along the throat 304, so that a negative pressure is formed at the port of suction chamber 303, which draws in the slag, mixes it with the working fluid at the throat 304, and conveys it upward. Then, it diffuses through the diffusion chamber 305, restoring pressure energy, lifting the slag to the ground, and discharging the slag.

[0048] In this way, the residue is directly conveyed upward through the suction chamber 303, the throat 304, the diffusion chamber 305 and the slag discharge channel 201. The conveying path has no bends and the cross-sectional size of the conveying path is large, which is efficient and not prone to blockage.

[0049] In a preferred embodiment, the annular jet pump 30 further includes a set of circumferentially uniformly arranged backflush nozzles 33. The backflush nozzles 33 are located below the guide nozzles 32, and their output direction is towards the interior of the slag discharge channel 201 and inclined downwards. The backflush nozzles 33 are connected to the liquid inlet chamber 302, and a floating sealing ring 34 for controlling the opening and closing of the guide nozzles 32 or the backflush nozzles 33 slides inside the liquid inlet chamber 302. Thus, if a large amount of residue blocks the port of the suction chamber 303, the amount of residue sucked in decreases, and the flow rate in the slag discharge channel 201 decreases.

[0050] Thus, when the flow monitoring device detects a decrease in flow or when personnel observe no residue discharge, the floating sealing ring 34 is controlled to move upward, blocking the drainage nozzle 32. The working fluid is then ejected through the backflushing nozzle 33, flushing out the residue blocking the suction chamber 303 port and restoring the unobstructed flow of the suction chamber 303 port. Then, the floating sealing ring 34 is moved downward to block the backflushing nozzle 33, allowing the working fluid to be ejected through the drainage nozzle 32 and re-draining the residue.

[0051] To facilitate the control of the floating sealing ring 34 moving up and down, a control rod 341 for adjusting the position of the floating sealing ring 34 is fixed on the floating sealing ring 34. The top of the control rod 341 is connected to a telescopic hydraulic cylinder on the ground. The telescopic hydraulic cylinder drives the floating sealing ring 34 to move up and down through the control rod 341.

[0052] Optionally, the floating sealing ring 34 includes a copper ring and a sealing gasket. Both the upper and lower ends of the ring are fixed with sealing gaskets. The control rod 341 is connected to the copper ring and controls the copper ring to move up and down. The sealing gaskets on the upper and lower ends of the copper ring respectively seal the drainage nozzle 32 and the backflush nozzle 33.

[0053] Combination Figure 1 As shown, the second end of the connecting pipe 40 is provided with a connecting hose 42. The connecting pipe 40 is connected to the liquid supply channel inside the tubing column 10 through the connecting hose 42. The connecting pipe 40 is flexibly connected to the tubing column 10, so that the connecting pipe 40 can swing.

[0054] Furthermore, each of the two connecting pipes 40 has a float 50 fixed at one end near the high-pressure nozzle 41. When the connecting pipes 40 sink into the brine, the two connecting pipes 40 are in an open state under the buoyancy of the float 50. When the connecting pipes 40 and the float 50 rise and leave the brine, the two connecting pipes 40 are in a closed state under the action of gravity. When the device is lifted or lowered as a whole, the connecting pipes 40 will not collide or interfere with the well wall.

[0055] As an optional implementation, the float 50 is made of pearl cotton.

[0056] Combination Figure 1 and Figure 4As shown, the second end of the connecting pipe 40 is provided with a connecting hinge 60, which allows the second end of the connecting pipe 40 to be rotatably connected to the bottom end of the pipe column 10. The connecting pipe 40 is rotatably connected to the pipe column 10 through the connecting hinge 60, which allows the first end of the connecting pipe 40 to swing.

[0057] As an optional implementation, the connecting hinge 60 includes a lug 61, a connecting shaft 62, and a limiting plate 63. The first end of the lug 61 is fixed to the column 10, the connecting shaft 62 is rotatably connected to the second end of the lug 61, the second end of the connecting pipe 40 is fixedly connected to the connecting shaft 62, and the second end of the connecting pipe 40 is rotatably connected to the lug 61 with the connecting shaft 62 as the pivot. The limiting plate 63 is fixed to the second end of the connecting pipe 40. The lug 61 is provided with a limiting groove 601 for limiting the swing range of the limiting plate 63, thereby limiting the swing range of the connecting pipe 40. When the connecting pipe 40 swings to the point where the output center of the high-pressure nozzle 41 is perpendicular to the brine surface, the limiting groove 601 restricts the limiting plate 63, preventing the connecting pipe 40 from continuing to rotate and unfold outward, so that the high-pressure nozzle 41 is in the position of the largest flushing and breaking area.

[0058] The salt cavern gas storage chamber bottom residue cleaning device described in the above embodiments includes the following steps in the cleaning process of removing impurities at the bottom of the chamber during the chamber construction process:

[0059] S1. Equipment preparation: The tubing 10 is connected to the drilling rig and lowered to the bottom of the salt cavern gas storage tank by the drilling rig. At this time, the connecting pipe 40 is completely submerged in the brine. Under the buoyancy of the float 50, the two connecting pipes 40 are in an open state and are limited by the connecting hinge 60.

[0060] S2. Residue Crushing: The high-pressure water pumping equipment delivers high-pressure water sequentially through the liquid supply channel inside the tubing 10, the connecting hose 42, and the connecting pipe 40 to the high-pressure nozzle 41. The water is then sprayed out through the high-pressure nozzle 41 to crush the residue at the bottom of the salt cavern gas storage tank. At the same time, the drilling rig drives the tubing 10 to rotate slowly, and the connecting pipe 40 and the high-pressure nozzle 41 rotate synchronously, so that the crushing area of ​​the two high-pressure nozzles 41 forms a circular area.

[0061] S3. Residue Extraction: The external working fluid pumping equipment sequentially transports the high-pressure working fluid along the working fluid conveying channel 202, the liquid inlet channel 301, and the liquid inlet chamber 302 to the drainage nozzle 32, and then sprays it out through the drainage nozzle 32. At this time, when the high-pressure working fluid passes through the end face of the throat pipe 304, its velocity can increase significantly, resulting in a significant decrease in pressure energy, thereby forming a negative pressure zone around the suction chamber 303 to draw in the fluid. The drawn-in fluid and the power fluid are mixed through the throat pipe 304, and then diffused through the diffusion chamber 305 to gradually restore the pressure energy. This pressure energy completes the upward transport of the residue mixture, and then it is transported to the ground through the slag discharge channel 201 inside the slag extraction pipe 20.

[0062] S4. Blockage Removal: When a large piece of residue blocks the suction chamber 303, the residue cannot be extracted, and the flow rate inside the suction pipe 20 decreases. When the flow rate decrease is detected by the flow monitoring device, the external hydraulic telescopic bar lifts the floating sealing ring 34 upward through the control rod 341, causing the floating sealing ring 34 to block the drainage nozzle 32. At this time, the working fluid in the liquid inlet chamber 302 is output through the backflushing nozzle 33. The high-pressure working fluid flushes out the residue blocking the suction chamber 303, restoring the unobstructed flow of the suction chamber 303. Then, the hydraulic telescopic bar pushes the floating sealing ring 34 downward through the control rod 341, causing the floating sealing ring 34 to block the backflushing nozzle 33. The working fluid in the liquid inlet chamber 302 is output through the drainage nozzle 32.

[0063] S5. Slag Removal Completed: After slag removal is completed, the tubing string 10 and slag removal pipe 20 are lifted upward as a whole, and the annular jet pump 30, connecting pipe 40 and float 50 rise synchronously. When the float 50 is removed from the brine, the two connecting pipes 40 are closed under the action of gravity, with a small lateral space, which facilitates entry and exit through the wellhead of the salt cavern gas storage tank.

[0064] In conjunction with the above embodiments, by setting high-pressure nozzles 41 at the bottom ends of the connecting pipes 40 on both sides of the bottom end of the tubular column 10, and making the two connecting pipes 40 have an open state and a closed state, when the two connecting pipes 40 are in the open state, a channel for the jet pump to extract residue is formed between the two connecting pipes 40, so that an annular jet pump 30 with a larger slag extraction diameter can be coaxially installed at the bottom end of the tubular column 10, increasing the diameter of the slag extraction channel, enabling the extraction of larger particles of residue, reducing the probability of blockage, and when the connecting pipes 40 are in the open state, the flushing and crushing range of the high-pressure nozzles 41 is large.

[0065] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A device for cleaning residue at the bottom of a salt cavern gas storage tank, characterized in that, include: The tubular column (10) has a double-layer structure and is equipped with an installation channel and a liquid supply channel inside; The slag suction pipe (20) is coaxially installed in the installation channel inside the pipe column (10) for conveying the slag upward; An annular jet pump (30) is coaxially installed at the first end of the slag extraction pipe (20) and located outside the pipe column (10) for extracting residue. Two connecting pipes (40) are located on both sides of the slag extraction pipe (20) and connected to the liquid supply channel inside the pipe column (10). The first end of each of the two connecting pipes (40) is equipped with a high-pressure nozzle (41) for spraying water to break up the residue. The two connecting tubes (40) have an open state and a closed state: After the connecting pipe (40) sinks into the brine, the two connecting pipes (40) are in an open state, so that a channel is formed between the two connecting pipes (40) for the annular jet pump (30) to extract the residue, and the crushing range of the high-pressure nozzle (41) is increased. When the connecting pipe (40) rises to the point of being completely separated from the brine, the two connecting pipes (40) are in a closed state under the action of gravity, which shortens the distance between the two connecting pipes (40). The slag extraction pipe (20) has a double-layer structure, with a slag discharge channel (201) for conveying the residue upward and a working fluid conveying channel (202) for conveying the working fluid. The annular jet pump (30) includes a pump body (31), and the pump body (31) is provided with an inlet channel (301) and an inlet chamber (302). The liquid inlet chamber (302) is connected to the working fluid delivery channel (202) through the liquid inlet channel (301); a set of circumferentially uniformly arranged diversion nozzles (32) are provided inside the pump body (31), the output direction of the diversion nozzles (32) is towards the inside of the slag discharge channel (201) and inclined upward, the diversion nozzles (32) are connected to the liquid inlet chamber (302), and the pump body (31) is provided with a suction chamber (303), a throat (304) and a diffusion chamber (305) in sequence along the slag delivery direction inside the pump body (31).

2. The salt cavern gas storage chamber bottom residue cleaning device according to claim 1, characterized in that, The annular jet pump (30) also includes a set of circumferentially uniformly arranged backflush nozzles (33). The backflush nozzles (33) are located below the flow nozzles (32). The output direction of the backflush nozzles (33) is towards the interior of the slag discharge channel (201) and inclined downward. The backflush nozzles (33) are connected to the liquid inlet chamber (302). A floating sealing ring (34) for controlling the opening and closing of the flow nozzles (32) or the backflush nozzles (33) slides inside the liquid inlet chamber (302).

3. The salt cavern gas storage chamber bottom residue cleaning device according to claim 2, characterized in that, A control rod (341) for adjusting the position of the floating sealing ring (34) is fixed on the floating sealing ring (34).

4. The salt cavern gas storage chamber bottom residue cleaning device according to claim 1, characterized in that, The second end of the connecting pipe (40) is provided with a connecting hose (42), and the connecting pipe (40) is connected to the liquid supply channel inside the tubing column (10) through the connecting hose (42).

5. The salt cavern gas storage chamber bottom residue cleaning device according to claim 1, characterized in that, Both of the connecting pipes (40) are fixed with floats (50) at one end near the high-pressure nozzle (41). When the connecting pipes (40) sink into the brine, the two connecting pipes (40) are in an open state under the buoyancy of the floats (50).

6. The salt cavern gas storage chamber bottom residue cleaning device according to claim 1, characterized in that, The second end of the connecting pipe (40) is provided with a connecting hinge (60), so that the second end of the connecting pipe (40) can be rotatably connected to the bottom end of the pipe column (10).

7. The salt cavern gas storage chamber bottom residue cleaning device according to claim 6, characterized in that, The connecting hinge (60) includes a lug (61), a connecting shaft (62), and a limiting plate (63). The first end of the lug (61) is fixed on the column (10). The connecting shaft (62) is rotatably connected to the second end of the lug (61). The second end of the connecting tube (40) is fixedly connected to the connecting shaft (62). The limiting plate (63) is fixed to the second end of the connecting tube (40). The lug (61) has a limiting groove (601) for limiting the swing range of the limiting plate (63), thereby limiting the swing range of the connecting tube (40).

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