An extended rapid thawing cavity tool

Abstract

The application discloses an extending type quick melting cavity tool, which comprises a rotating power structure part, a connecting rod structure part, an extending power structure part and a switch structure part. The rotating power structure part comprises a joint, a sealing cover plate, a suspended upper body, an upper bearing and an end cover; the connecting rod structure part comprises a thin hinge support, a high-pressure straight pipe, a four-head hinge support, an upper hinge rod, an upper hinge support, a high-pressure hose, a middle hinge support, a lower hinge rod, a lower hinge support and a restraint plate; the extending power structure part comprises a piston sleeve, a piston push rod and a spring; and the switch structure part comprises a stop pin, a lower support short section and a connecting rod. The upper joint is connected with a rotating water injection pipe; the upper joint is driven to rotate together with the suspended upper body through a spline structure; the piston push rod is impacted by high-pressure water flow and moves downwards, drives the upper end of the upper hinge rod to move downwards, drives the lower end of the upper hinge rod, the high-pressure hose and the upper end of the lower hinge rod to extend outwards, and drives the lower end of the lower hinge rod and the restraint plate to move upwards.

Description

Technical Field

[0001] This invention discloses an extended rapid melting cavity tool, which is a downhole tool for melting cavities in underground salt rock gas storage. Background Technology

[0002] Underground gas storage facilities are crucial infrastructure for natural gas pipeline systems, playing a vital role in emergency peak shaving and strategic reserves. The development and advancement of underground gas storage not only alleviates pressure on natural gas pipelines but also addresses the major contradiction in natural gas supply: overcapacity in summer and undersupply in winter. Constructing salt cavern gas storage involves finding suitable salt domes or layers, drilling to the salt layer using conventional drilling methods, injecting fresh water to dissolve the rock salt into brine, extracting the brine, and finally forming a gas-bearing cavity with a specific volume and shape within the salt layer. This method offers advantages such as rapid injection and extraction, high throughput, low cushion gas requirements, and the ability to recover and reuse gas.

[0003] To accelerate the formation of underground gas storage facilities, rapid cavity-building tools are needed. The principle of using cavity-building tools is mainly that the rotating spindle achieves rotational motion under the action of water. After fresh water passes through the nozzle on the nozzle head, it forms an intermittent vortex circulation and generates high-frequency oscillating water waves and cavitation noise (ultrasound), thereby achieving water erosion of the cavity wall. At the same time, it also effectively changes the flow state of the fluid in the well cavity and accelerates the melting of salt rock.

[0004] A cavity-forming tool has been developed abroad that can flush the wellbore until it reaches the required diameter. This tool has been applied to gas storage tanks, salt production wells, and conventional wells located in thick salt rock formations. However, this tool requires a special nozzle of the appropriate size, resulting in high costs and slow cavity-forming speed. Some domestic scholars have proposed an extended nozzle fusion-promoting tool. The extended structure of this tool can support two high-pressure straight pipes. The number of high-pressure straight pipes is proportional to the number of vortex rings. The vortex ring flow continuously erodes the cavity wall of the salt rock gas storage tank. To accelerate the formation of the salt cavern gas storage tank, the tool needs to extend to more high-pressure straight pipes, thereby increasing the speed and area of ​​salt rock erosion.

[0005] Therefore, based on years of experience and practice in related industries, the inventor proposes an extended rapid cavity melting tool to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide an extended rapid cavity melting tool that overcomes the problems of slow cavity melting speed and small cavity melting range of existing cavity melting tools.

[0007] The objective of this invention is achieved by providing an extended rapid cavity melting tool, comprising a rotary power structure, a connecting rod structure, an extended power structure, and a switching structure. The rotary power structure includes a connector, a sealing cover, a suspension upper body, an upper bearing, and an end cap. The connecting rod structure includes a thin hinge support, a high-pressure straight pipe, a four-head hinge support, an upper hinge rod, an upper hinge support, a high-pressure hose, a middle hinge support, a lower hinge rod, a lower hinge support, and a constraint plate. The extended power structure includes a piston sleeve, a piston push rod, and a spring. The switching structure includes a stop pin, a lower support section, and a connecting rod.

[0008] In a preferred embodiment of the present invention, the rotating power structure includes a threaded structure at the upper end and rear end of the upper connector, and a spline structure in the middle. The upper connector is connected to the end cover by threads, and the upper connector is circumferentially fixed to the upper suspension body by splines, so that the upper suspension body rotates together with the upper connector. The upper bearing is installed between the upper suspension body and the upper connector to play a self-aligning role. The sealing cover is connected to the upper suspension body by threads. The upper suspension body is connected to the piston sleeve by threads.

[0009] In a preferred embodiment of the present invention, in the connecting rod structure, the lower end of the piston sleeve is connected to a thin hinge support, the piston sleeve and the piston push rod are connected by a hexagonal groove, the high-pressure straight pipe is connected to the piston sleeve through the thin hinge support, the upper end of the upper hinge rod is connected to the piston sleeve by hinge to a four-head hinge support, the middle part of the high-pressure straight pipe is connected to an upper hinge support, a high-pressure hose and a middle hinge support, the lower end of the upper hinge rod is connected to the high-pressure straight pipe by hinge to the upper hinge support, the upper end of the lower hinge rod is connected to the high-pressure straight pipe by hinge to the middle hinge support, and the lower end of the lower hinge rod is connected to the constraint plate by hinge to the lower hinge support.

[0010] In a preferred embodiment of the present invention, the extended power structure includes a water flow channel inside the piston push rod, and the lower end is connected to the four-head hinge support. A spring is installed between the piston push rod and the piston sleeve to mitigate the impact of high-pressure water and to restore the piston push rod to its original position.

[0011] In a preferred embodiment of the present invention, in the switch structure, a lower hinge support is connected to the constraint plate, a groove is provided in the constraint plate, a stop pin is installed on the lower support section, the stop pin and the constraint plate are connected together by the groove, a cylindrical groove is provided in the middle part of the lower support section, the lower support section is connected to the piston sleeve by a connecting rod, the upper end of the high pressure hose is connected to the lower end of the piston push rod, and the lower end is connected to the lower support section.

[0012] In a preferred embodiment of the present invention, the stop pin is engaged with the groove on the constraint plate by the protrusion, thereby restricting the sliding of the constraint plate on the lower support section. This ensures that the entire outer diameter of the extended rapid melting cavity tool remains the same during the process of being lowered into the salt cavern gas storage tank, meaning that the high-pressure straight pipe is always held within the cylindrical groove designed in the lower support section. Initially, the constraint plate is restricted by the stop pin, but when the force of the lower hinge rod is sufficiently large, the stop pin is sheared off, and the constraint plate slides upward at the upper end of the lower support section as the lower hinge support moves upward.

[0013] In a preferred embodiment of the present invention, the upper connector is connected to the water injection pipe string via an upper thread. The drill bit rotates the water injection pipe string, which drives the upper connector to rotate. The rotation of the rotating power structure part drives the connecting rod structure part, the extension power structure part, and the switch structure part to rotate together.

[0014] In a preferred embodiment of the present invention, the upper connector is connected to the water injection pipe column via an upper thread. High-pressure water flows through the interior of the upper connector, and a large amount of high-pressure water remains inside the piston sleeve. Part of the water flows into the high-pressure hose through the piston push rod, while the other part forms water pressure that pushes the piston push rod downward against the spring force. The four-head hinge support moves downward along with the piston push rod, thereby causing the upper end of the upper hinge rod to move downward. The lower end of the upper hinge rod moves outward, and the high-pressure straight pipe is hinged at its upper end to the thin hinge support. Using the pivot point as the base, the system rotates outward, causing the upper end of the middle hinge support and the lower hinge rod hinged to the middle hinge support to move outward. This causes the lower end of the lower hinge rod to move upward, which in turn causes the lower hinge support hinged to the lower hinge rod to move upward. Under the upward pulling force of the lower hinge rod, the stop pin is sheared, and the constraint plate moves upward. Thus, through the linkage structure, the high-pressure straight pipe extends outward. At the same time, the high-pressure water flow inside the high-pressure hose enters the four extended high-pressure straight pipes. As the entire system rotates, the high-pressure water flow is ejected from the high-pressure straight pipes.

[0015] In a preferred embodiment of the present invention, the upper end of the upper connector is no longer connected to the water injection pipe column, the piston rod no longer moves downward, the spring compressed by the piston rod begins to rebound, the piston rod moves upward, driving the upper end of the four-head hinge support and the upper hinge rod to move upward; the inward movement of the lower end of the upper hinge rod causes the high-pressure straight pipe to rotate inward with the hinge point where the upper end is hinged to the thin hinge support as the base point, driving the middle hinge support connected to the high-pressure straight pipe to move inward, then the upper end of the lower hinge rod moves inward, the lower end moves downward, the lower hinge support hinged to the lower hinge rod moves downward, and then the constraint plate moves downward, returning to its original position; thus, the high-pressure straight pipe is retracted into the cylindrical groove of the lower support short section, the outer diameter of the tool is restored to the same size, and then the entire tool is lifted out of the salt cavern gas storage tank by pulling up the upper connector.

[0016] As described above, the extended rapid cavity fusion tool provided by the present invention has the following beneficial effects:

[0017] This tool, through the design of high-pressure water flow paths and extended linkage structures, enables the tool to extend into four high-pressure straight pipes, increasing the number of vortex rings and the area of ​​erosion of the salt cavern walls, thereby accelerating the erosion of salt rock. Attached Figure Description

[0018] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0019] Figure 1 : This is a half-sectional view of the extended rapid cavity melting tool of the present invention.

[0020] Figure 2 : This is a view of the extended rapid cavity melting tool of the present invention in operation.

[0021] Figure 3 : This is the isometric view of the upper connector.

[0022] In the picture:

[0023] 1. Connector;

[0024] 2. Sealing cover plate

[0025] 3. Suspend the upper body;

[0026] 4. Install the upper bearing;

[0027] 5. End caps;

[0028] 6. Piston sleeve;

[0029] 7. Piston push rod;

[0030] 8. Spring;

[0031] 9. Thin hinge support;

[0032] 10. High-pressure straight pipe;

[0033] 11. Four-head hinge support;

[0034] 12. Upper hinge rod;

[0035] 13. Upper hinge support;

[0036] 14. High-pressure hose;

[0037] 15. Middle hinge support;

[0038] 16. Lower hinge rod;

[0039] 17. Lower hinge support;

[0040] 18. Constraint plate;

[0041] 19. Stop pin;

[0042] 20. Lower support section;

[0043] 21. Connecting rod; Detailed Implementation

[0044] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0045] like Figures 1 to 3 As shown, this invention provides an extended rapid cavity melting tool, comprising a rotary power structure, a connecting rod structure, an extended power structure, and a switching structure. The rotary power structure includes an upper connector 1, a sealing cover plate 2, a suspension upper body 3, an upper bearing 4, and an end cap 5; the extended power structure includes a piston sleeve 6, a piston push rod 7, and a spring 8; the connecting rod structure includes a thin hinge support 9, a high-pressure straight pipe 10, a four-head hinge support 11, an upper hinge rod 12, an upper hinge support 13, a high-pressure hose 14, a middle hinge support 15, a lower hinge rod 16, a lower hinge support 17, and a constraint plate 18; the switching structure includes a stop pin 19, a lower support section 20, and a connecting rod 21.

[0046] Furthermore, such as Figures 1 to 3 As shown, in the rotary power structure, the upper connector 1 has threaded structures at both the upper end and the rear end, and a spline structure in the middle. The upper connector 1 is connected to the end cover 5 by threads, and the upper connector 1 is connected to the upper suspension body 3 by splines, so that the upper suspension body 3 rotates together with the upper connector 1. The upper bearing 4 is installed between the upper suspension body 3 and the upper connector 1, and plays a self-aligning role. The sealing cover 2 is connected to the upper suspension body 3 by threads, and the upper suspension body 3 is connected to the piston sleeve 6 by threads.

[0047] Furthermore, such as Figures 1 to 3 As shown, in the extended power structure, the lower end of the piston sleeve 6 is connected to a thin hinge support 9, the piston push rod 7 has a hexagonal structure, the piston push rod 7 has a water flow channel inside, and the lower end is connected to a four-head hinge support 11. The piston sleeve 6 and the piston push rod 7 are connected by a hexagonal groove. The spring 8 is installed between the piston push rod 7 and the piston sleeve 6 to relieve the impact of high-pressure water and to restore the piston push rod 7 to its original position.

[0048] Furthermore, such as Figures 1 to 3As shown, in the connecting rod structure, the high-pressure straight pipe 10 is connected to the piston sleeve 6 via a thin hinge support 9. The upper end of the upper hinge rod 12 is connected to the piston sleeve 6 via a four-head hinge support 11. The middle part of the high-pressure straight pipe 10 is connected to the upper hinge support 13, the high-pressure hose 14, and the middle hinge support 15. The lower end of the upper hinge rod 12 is connected to the high-pressure straight pipe 10 via a hinge to the upper hinge support 13. The upper end of the lower hinge rod 16 is connected to the high-pressure straight pipe 10 via a hinge to the middle hinge support 15. The lower end of the lower hinge rod 16 is connected to the constraint plate 18 via a hinge to the lower hinge support 17. The constraint plate 18 has a groove, and the lower hinge support 17 is connected to the constraint plate 18.

[0049] Furthermore, such as Figures 1 to 3 As shown, in the switch structure, a stop pin 19 is installed on the lower support section 20. The stop pin 19 is connected to the constraint plate 18 by a groove. The lower support section 20 is connected to the piston sleeve 6 by a connecting rod 21.

[0050] Furthermore, such as Figures 1 to 3 As shown, the stop pin 19 is engaged with the groove on the constraint plate by the protrusion, which restricts the sliding of the constraint plate 18 on the lower support section 20. This ensures that the entire outer diameter of the extended rapid melting cavity tool remains the same during the process of being lowered into the salt cavern gas storage tank, that is, the high-pressure straight pipe 10 is always stuck in the cylindrical groove designed in the lower support section 20. The constraint plate 18 is initially restricted by the stop pin 19. When the force of the lower hinge rod 16 is large enough, the stop pin 19 will be sheared off, and the constraint plate 18 will slide upward at the upper end of the lower support section 20 as the lower hinge support 17 moves upward.

[0051] Furthermore, such as Figures 1 to 3 As shown, the upper connector 1 is connected to the water injection pipe string via an upper thread. When the drill bit rotates the water injection pipe string, it drives the upper connector 1 to rotate. The rotation of the rotating power structure part drives the connecting rod structure part, the extension power structure part, and the switch structure part to rotate together.

[0052] Furthermore, such as Figures 1 to 3As shown, the upper connector 1 is connected to the water injection pipe column via an upper thread. High-pressure water flows through the interior of the upper connector 1, and a large amount of high-pressure water remains inside the piston sleeve 6. Part of it flows into the high-pressure hose 14 through the piston push rod 7, while the other part forms water pressure that pushes the piston push rod 7 downward against the spring force 8. The four-head hinge support 11 moves downward along with the piston push rod, thereby driving the upper end of the upper hinge rod 12 to move downward. The lower end of the upper hinge rod 12 moves outward, and the high-pressure straight pipe 10 rotates outward with the hinge point where its upper end is hinged to the thin hinge support 9 as the base point. This causes the upper ends of the middle hinge support 15 and the lower hinge rod 16 hinged to the middle hinge support 15 to move outward, thereby causing the lower end of the lower hinge rod 16 to move upward, which in turn causes the lower hinge support 17 hinged to the lower hinge rod 16 to move upward. Under the upward pulling force of the lower hinge rod 16, the stop pin 19 is sheared, and the constraint plate 18 moves upward. Thus, through the linkage structure, the high-pressure straight pipe 10 completes its outward extension. At the same time, the high-pressure water flow inside the high-pressure hose 14 enters the four extended high-pressure straight pipes 10 respectively. As the whole rotates, the high-pressure water flow is sprayed out from the high-pressure straight pipes 10.

[0053] Furthermore, such as Figures 1 to 3 As shown, the upper end of the upper connector 1 is no longer connected to the water injection pipe column, the piston rod 7 no longer moves downward, the spring 8 compressed by the piston rod 7 begins to rebound, the piston rod 7 moves upward, driving the upper ends of the four-head hinge support 11 and the upper hinge rod 12 to move upward; the lower end of the upper hinge rod 12 moves inward, causing the high-pressure straight pipe 10 to rotate inward with the hinge point where its upper end is hinged to the thin hinge support 9 as the base point, driving the middle hinge support 15 connected to the high-pressure straight pipe 10 to move inward, then the upper end of the lower hinge rod 16 moves inward and the lower end moves downward, the lower hinge support 17 hinged to the lower hinge rod 16 moves downward, and then the constraint plate 18 moves downward, returning to its original position; thus, the high-pressure straight pipe 10 is retracted into the cylindrical groove of the lower support short section 20, the outer diameter of the tool is restored to the same size, and then the entire tool is lifted out of the salt cave gas storage tank by pulling the upper connector 1.

[0054] Working principle of the invention:

[0055] The upper end of this tool is connected to the water injection pipe string via a thread. The water injection pipe string can be rotated by the drill bit. The rotational power is transmitted to the upper connector 1 through the threaded structure, thereby causing the rotation of the rotational power structure part to drive the connecting rod structure part, the extension power structure part, and the switch structure part to rotate together.

[0056] While rotating, the linkage structure also functions. After the high-pressure water flows through the upper connector 1, a large amount of high-pressure water remains inside the piston sleeve 6. Part of it flows into the high-pressure hose 14 through the piston push rod 7, while the other part creates water pressure that pushes the piston push rod 7 downward under the action of the spring force 8. The four-head hinge support 11 moves with the piston push rod 7, causing the upper end of the upper hinge rod 12 to move downward, thus moving the lower end of the upper hinge rod 12 outward. The hinge point where the upper end of the high-pressure straight pipe 10 is hinged to the thin hinge support 9 is... The base point rotates outward, which in turn causes the upper end of the middle hinge support and the lower hinge rod hinged to the middle hinge support to move outward, thereby causing the lower end of the lower hinge rod 16 to move upward, which in turn causes the lower hinge support 17 hinged to the lower hinge rod 16 to move upward. The lower hinge support 17 is connected to the constraint plate 18. The constraint plate 18 is initially restricted by the stop pin 19. However, when the force of the lower hinge rod 16 is large enough, the stop pin 19 will be sheared off, and the constraint plate 18 slides upward at the upper end of the lower support section 20 as the lower hinge support 17 moves upward.

[0057] During the tool recovery stage, the upper end of the upper connector 1 is no longer connected to the water injection pipe, the piston rod 7 no longer moves downward, the spring 8 compressed by the piston rod 7 begins to rebound, the piston rod 7 moves upward, driving the upper ends of the four-head hinge support 11 and the upper hinge rod 12 to move upward; the lower end of the upper hinge rod 12 moves inward, causing the high-pressure straight pipe 10 to rotate inward with the hinge point where its upper end is hinged to the thin hinge support 9 as the base point, driving the middle hinge support 15 connected to the high-pressure straight pipe 10 to move inward, then the upper end of the lower hinge rod 16 moves inward and the lower end moves downward, the lower hinge support 17 hinged to the lower hinge rod 16 moves downward, and then the constraint plate 18 moves downward, returning to its original position; thus, the high-pressure straight pipe 10 is retracted into the cylindrical groove of the lower support short section 20, the outer diameter of the tool is restored to the same size, and then the entire tool is lifted out of the salt cavern gas storage tank by pulling up the upper connector 1.

[0058] As described above, the extended rapid cavity fusion tool provided by the present invention has the following beneficial effects:

[0059] This tool, through the design of high-pressure water flow paths and extended linkage structures, enables the tool to extend into four high-pressure straight pipes, increasing the number of vortex rings and the area of ​​erosion of the salt cavern walls, thereby accelerating the erosion of salt rock.

[0060] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. An extended rapid cavity melting tool, characterized in that, It includes a rotary power structure, a connecting rod structure, an extended power structure, and a switch structure. The rotary power structure includes an upper connector (1), a sealing cover (2), a suspension upper body (3), an upper bearing (4), and an end cap (5). The extended power structure includes a piston sleeve (6), a piston push rod (7), and a spring (8). The connecting rod structure includes a thin hinge support (9), a high-pressure straight pipe (10), a four-head hinge support (11), an upper hinge rod (12), an upper hinge support (13), a high-pressure hose (14), a middle hinge support (15), a lower hinge rod (16), a lower hinge support (17), and a constraint plate (18). The switch structure includes a stop pin (19), a lower support short section (20), and a connecting rod (21). The rotating power structure has threaded structures at the upper end and rear end of the upper connector (1) and spline structure in the middle. The upper connector (1) is connected to the end cover (5) by threads, and the upper connector (1) is connected to the upper suspension body (3) by spline, so that the upper suspension body (3) rotates together with the upper connector (1). The upper bearing (4) is installed between the upper suspension body (3) and the upper connector (1) to play the role of self-alignment. The sealing cover plate (2) is connected to the upper suspension body (3) by threads, and the upper suspension body (3) is connected to the piston sleeve (6) by threads. In the extended power structure, the lower end of the piston sleeve (6) is connected to a thin hinge support (9), the piston push rod (7) has a hexagonal structure, the piston push rod (7) has a water flow channel inside, and the lower end is connected to a four-head hinge support (11). The piston sleeve (6) and the piston push rod (7) are connected by a hexagonal groove. The spring (8) is installed between the piston push rod (7) and the piston sleeve (6) to relieve the impact of high pressure water and to restore the piston push rod (7). In the connecting rod structure, the high-pressure straight pipe (10) is connected to the piston sleeve (6) through the thin hinge support (9). The upper end of the upper hinge rod (12) is connected to the piston sleeve (6) through the hinge of the four-head hinge support (11). The middle part of the high-pressure straight pipe (10) is connected to the upper hinge support (13), the high-pressure hose (14) and the middle hinge support (15). The lower end of the upper hinge rod (12) is connected to the high-pressure straight pipe (10) through the hinge of the upper hinge support (13). The upper end of the lower hinge rod (16) is connected to the high-pressure straight pipe (10) through the hinge of the middle hinge support (15). The lower end of the lower hinge rod (16) is connected to the constraint plate (18) through the hinge of the lower hinge support (17). The constraint plate (18) has a groove in it. The lower hinge support (17) is connected to the constraint plate (18). In the switch structure, a stop pin (19) is installed on the lower support section (20). The stop pin (19) and the constraint plate (18) are connected together by a groove. The lower support section (20) is connected to the piston sleeve (6) through a connecting rod (21).

2. The extended rapid cavity melting tool according to claim 1, characterized in that, The stop pin (19) is engaged with the groove on the constraint plate by the protrusion, which restricts the sliding of the constraint plate (18) on the lower support section (20). This ensures that the outer diameter of the entire extended rapid melting cavity tool remains the same during the process of being lowered into the salt cavern gas storage tank. That is, the high-pressure straight pipe (10) is always locked in the cylindrical groove designed in the lower support section (20). The constraint plate (18) is initially restricted by the stop pin (19). When the force of the lower hinge rod (16) is large enough, the stop pin (19) will be sheared off, and the constraint plate (18) will slide upward at the upper end of the lower support section (20) as the lower hinge support (17) moves upward.

3. The extended rapid cavity melting tool according to claim 1, characterized in that, The upper connector (1) is connected to the water injection pipe string through the upper thread. The drill bit rotates the water injection pipe string, which drives the upper connector (1) to rotate. The rotation of the rotation power structure part drives the connecting rod structure part, the extension power structure part and the switch structure part to rotate together.

4. The extended rapid cavity melting tool according to claim 1, characterized in that, The upper connector (1) is connected to the water injection pipe column via an upper thread. High-pressure water flows through the interior of the upper connector (1), and a large amount of high-pressure water remains inside the piston sleeve (6). Part of the water flows into the high-pressure hose (14) through the piston push rod (7), and the other part forms water pressure to push the piston push rod (7) downward against the spring force. The four-head hinge support (11) moves downward along with the piston push rod, thereby driving the upper end of the upper hinge rod (12) to move downward. The lower end of the upper hinge rod (12) moves outward, and the high-pressure straight pipe (10) rotates outward with the hinge point where its upper end is hinged to the thin hinge support (9) as the base point, thereby driving the upper end of the upper hinge rod (12) to move downward. The upper ends of the middle hinge support (15) and the lower hinge rod (16) hinged to the middle hinge support (15) move outward, thereby causing the lower end of the lower hinge rod (16) to move upward, which in turn causes the lower hinge support (17) hinged to the lower hinge rod (16) to move upward. Under the action of the upward pulling force of the lower hinge rod (16), the stop pin (19) is sheared, and the constraint plate (18) moves upward. Thus, through the linkage structure, the high-pressure straight pipe (10) completes the outward extension. At the same time, the high-pressure water flow inside the high-pressure hose (14) enters the four extended high-pressure straight pipes (10) respectively. As the whole rotates, the high-pressure water flow is sprayed out from the high-pressure straight pipes (10).

5. The extended rapid cavity melting tool according to claim 1, characterized in that, The upper end of the upper connector (1) is no longer connected to the water injection pipe column, the piston push rod (7) no longer moves downward, the spring (8) compressed by the piston push rod (7) begins to rebound, the piston push rod (7) moves upward, driving the upper end of the four-head hinge support (11) and the upper hinge rod (12) to move upward; the lower end of the upper hinge rod (12) moves inward, causing the high-pressure straight pipe (10) to rotate inward with the hinge point where its upper end is hinged to the thin hinge support (9) as the base point, driving the high-pressure straight pipe (10) to rotate inward. The connected middle hinge support (15) moves inward, then the upper end of the lower hinge rod (16) moves inward and the lower end moves downward. The lower hinge support (17), which is hinged to the lower hinge rod (16), moves downward, thereby causing the constraint plate (18) to move downward and return to its original position. As a result, the high-pressure straight pipe (10) is retracted into the cylindrical groove of the lower support short section (20), and the outer diameter of the tool is restored to the same size. Then, the entire tool is lifted out of the salt cave gas storage tank by lifting the upper connector (1).

6. The extended rapid cavity melting tool according to claim 1, characterized in that, The upper end of the tool is connected to the water injection pipe column by a thread. The water injection pipe column is driven to rotate by the drill bit. The rotational power is transmitted to the upper connector (1) through the threaded structure. Thus, the rotation of the rotational power structure part drives the connecting rod structure part, the extension power structure part and the switch structure part to rotate together. While rotating, the linkage structure also functions. After the high-pressure water flows through the upper connector (1), a large amount of high-pressure water remains inside the piston sleeve (6). Part of it flows into the high-pressure hose (14) through the piston push rod (7), and the other part forms water pressure that pushes the piston push rod (7) downward under the action of the spring force. The four-head hinge support (11) moves with the piston push rod (7), which drives the upper end of the upper hinge rod (12) to move downward, thereby causing the lower end of the upper hinge rod (12) to move outward. The high-pressure straight pipe (10) takes the hinge point where its upper end is hinged to the thin hinge support (9) as its base point. Rotating outwards causes the upper ends of the middle hinge support and the lower hinge rod hinged to the middle hinge support to move outwards, thereby causing the lower end of the lower hinge rod (16) to move upwards, which in turn causes the lower hinge support (17) hinged to the lower hinge rod (16) to move upwards. The lower hinge support (17) is connected to the constraint plate (18). The constraint plate (18) is initially restricted by the stop pin (19), but when the force of the lower hinge rod (16) is large enough, the stop pin (19) will be sheared off, and the constraint plate (18) slides upwards at the upper end of the lower support section (20) as the lower hinge support (17) moves upwards. During the tool recovery stage, the upper end of the upper connector (1) is no longer connected to the water injection pipe column, the piston rod (7) no longer moves downward, the spring (8) compressed by the piston rod (7) begins to rebound, the piston rod (7) moves upward, driving the upper end of the four-head hinge support (11) and the upper hinge rod (12) to move upward; the inward movement of the lower end of the upper hinge rod (12) causes the high-pressure straight pipe (10) to rotate inward with the hinge point where the upper end is hinged to the thin hinge support (9) as the base point, driving the high-pressure straight pipe to rotate inward. (10) The middle hinge support (15) connected to the lower hinge rod (16) moves inward, and then the upper end of the lower hinge rod (16) moves inward and the lower end moves downward. The lower hinge support (17) hinged to the lower hinge rod (16) moves downward, thereby causing the constraint plate (18) to move downward and return to its original position. As a result, the high-pressure straight pipe (10) is retracted into the cylindrical groove of the lower support short section (20), and the outer diameter of the tool is restored to the same size. Then, the entire tool is lifted out of the salt cave gas storage tank by lifting the upper connector (1).

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