A dissolvable ball seat for setting a packer in a salt cavern energy storage injection-production well

Abstract

The present invention relates to the technical field of salt cavern compressed air energy storage reservoirs, and particularly to a dissolvable ball seat for setting a packer of an injection-production well in a salt cavern energy storage, aiming at solving the problem of the pipe string running up when the ball seat for the large-diameter injection-production pipe string is knocked off. The present invention includes a ball seat body, a plugging member and a connecting nipple; the ball seat body is inserted into the connecting nipple and connected to the connecting nipple, and the plugging member is seated in the ball seat body to plug the channel of the ball seat body; both the ball seat body and the plugging member are made of a soluble material, and after the packer is set, the ball seat body and the plugging member are dissolved to realize the internal diameter of the pipe. In the present invention, after the plugging member plugs the channel on the ball seat body, pressure is applied to set the packer, and then the pressure is removed and the plugging member and the ball seat body are dissolved in the well fluid to realize the internal diameter of the pipe, avoiding the pressure wave and the radial rebound of the pipe string caused by the sudden pressure loss when the ball seat body and the plugging member are knocked off by continuous pressurization, thereby avoiding the running up of the pipe string and ensuring the normal operation of the energy storage reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of salt cavern type compressed air energy storage reservoirs, and in particular to a soluble ball seat for setting a packer for a salt cavern energy storage injection and production well. Background Art

[0002] With the continuous development of compressed air energy storage, compressed air energy storage power stations have reached 300MW level, and the injection and production flow rate of a single well has reached 35×10 5 m 3 / h, the size of the injection and production channel casing of the injection and production well reaches 13-3 / 8", and the size of the injection and production packer used reaches 18-5 / 8". In order to ensure the long-term sealing effect, the injection and production packer usually adopts a hydraulic setting permanent structure, which needs to be combined with the matching setting ball seat for setting construction. The maximum pressure required to knock out the ball seat after setting reaches 18-20MPa. However, due to the large diameter of the injection and production string, when the pressure is held down to knock out the setting ball seat after the packer is set, the string will rise, resulting in damage to the wellhead casing hanger. After analysis, it was found that due to the large volume of the large-sized injection and production tubing, the pressure in the injection and production tubing suddenly lost at the moment the ball seat was knocked off, causing a large amount of liquid to instantly spray out and generate a pressure wave. When the energy of the pressure wave was transmitted in the liquid in the injection and production well, it first acted on the inner wall of the salt cavern of the energy storage cavity, and then returned to the wellhead to form an upward force. At the same time, when the injection and production tubing was subjected to internal pressure, the tubing expanded radially and contracted axially. When the pressure in the tube suddenly lost, the injection and production tubing would rebound radially. Therefore, the combined effect of the pressure wave energy and the radial rebound force of the injection and production tubing led to the injection and production tubing upward accident. Summary of the invention

[0003] The purpose of the present invention is to provide a dissolvable ball seat for setting a packer of a salt cavern energy storage injection and production well, so as to solve the problem of upward movement of the existing large-diameter injection and production pipe string when the setting ball seat is knocked off.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A soluble ball seat for sealing a packer for a salt cavern energy storage injection and production well comprises a ball seat body, a plugging piece and a connecting nipple; the ball seat body is inserted into the connecting nipple and connected to the connecting nipple, and the plugging piece is seated into the ball seat body to block the passage of the ball seat body; the ball seat body and the plugging piece are both made of soluble materials, and after the packer is sealed, the ball seat body and the plugging piece dissolve to realize the inner diameter of the pipe.

[0006] Furthermore, the soluble material is a soluble magnesium-based alloy.

[0007] Furthermore, the blocking member includes a shell, a rupture disk and a dissolution-promoting agent;

[0008] The rupture disk is installed on the shell and forms a hollow cavity with the shell, and the solubilizing agent is contained in the hollow cavity;

[0009] After the rupture disk ruptures under a set pressure, the liquid in the well enters the hollow cavity and contacts the solubilizing agent.

[0010] Furthermore, the sealing member also includes a pressing cap, which is installed on the shell to press the rupture disk tightly against the shell.

[0011] Furthermore, the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well also includes a flow baffle, which is installed on the upper end of the ball seat body and located above the plugging member;

[0012] The flow baffle is provided with a through hole.

[0013] Furthermore, the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well also includes a spring, and the spring is used to apply a thrust to the plugging member to push the plugging member to move toward the ball seat body.

[0014] Furthermore, the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well also includes a shear pin, and the shear pin is inserted into the ball seat body and the connecting short joint at the same time;

[0015] The outer circle of the ball seat body is provided with an annular groove, and the annular groove and the inner wall of the connecting short section form an annular accommodating cavity, and the solubilizing agent is arranged in the annular accommodating cavity;

[0016] After pressurizing to the set pressure, the shear pin is sheared off, the ball seat body moves downward and abuts against the connecting nipple, and the well fluid enters the annular accommodating chamber from the mounting hole of the shear pin on the connecting nipple.

[0017] Furthermore, the dissolution aid includes a solid acid and a solid corrosion inhibitor.

[0018] Optionally, the dissolution aid includes a solid acid, a solid corrosion inhibitor and a solid base, and the solid base is wrapped in glutinous rice paper.

[0019] Furthermore, the solid acid is aminosulfonic acid, and the solid corrosion inhibitor is rhodine.

[0020] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0021] The soluble ball seat for sealing a salt cavern energy storage injection and production well provided by the present invention comprises a ball seat body, a plugging piece and a connecting short joint; the ball seat body is inserted into the connecting short joint and connected to the connecting short joint, and the plugging piece is seated into the ball seat body to block the passage of the ball seat body; the ball seat body and the plugging piece are both made of soluble materials, and after the packer is sealed, the ball seat body and the plugging piece are dissolved to realize the inner diameter of the pipe.

[0022] The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well provided by the present invention is pressurized to set the packer after the plugging piece blocks the passage on the ball seat body, and then the pressure is removed to dissolve the plugging piece and the ball seat body in the well liquid to realize the inner diameter of the pipe, thereby avoiding the pressure wave and radial rebound of the pipe string caused by the sudden loss of pressure when the ball seat body and the plugging piece are knocked off by continuing to pressurize, thereby avoiding the upward movement of the pipe string and ensuring the normal operation of the energy storage depot. At the same time, it also avoids the situation where the energy storage depot cavity is fractured and loses its seal due to energy impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a soluble ball seat for setting a packer for a salt cavern energy storage injection and production well provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the working state of a soluble ball seat for setting a packer for a salt cavern energy storage injection and production well provided by an embodiment of the present invention;

[0026] Figure 3 Another structural schematic diagram of a soluble ball seat for setting a packer for a salt cavern energy storage injection and production well provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of another working state of a soluble ball seat for setting a packer for a salt cavern energy storage injection and production well provided by an embodiment of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the plugging member;

[0029] Figure 6 Another structural schematic diagram of the blocking member.

[0030] Icons: 100, ball seat body; 200, sealing part; 210, shell; 220, rupture disk; 230, pressure cap; 211, half shell; 212, top plate; 300, connecting short section; 310, cylinder; 320, lower joint; 400, flow baffle; 500, spring; 600, shear pin; 700, coupling; 101, annular accommodating chamber. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] Due to the large size of the injection and production pipes in the compressed air energy storage power station, the pressure in the injection and production pipe suddenly decreases at the moment the ball seat is knocked off, causing a large amount of liquid to spray out instantly, generating a pressure wave and causing the pipe to rebound radially, which in turn causes the pipe to move upward.

[0035] In view of this, the present invention provides a soluble ball seat for sealing a salt cavern energy storage injection and production well, comprising a ball seat body 100, a plugging piece 200 and a connecting short joint 300; the ball seat body 100 is inserted into the connecting short joint 300 and connected to the connecting short joint 300, and the plugging piece 200 is seated in the ball seat body 100 to block the channel of the ball seat body 100; the ball seat body 100 and the plugging piece 200 are both made of soluble materials, and after the packer is sealed, the ball seat body 100 and the plugging piece 200 are dissolved to realize the inner diameter of the pipe.

[0036] The packer for the salt cavern energy storage injection and production well provided by the present invention uses a soluble ball seat to seal the passage on the ball seat body 100 after the plugging piece 200 blocks it, and then pressurizes the packer, and then removes the pressure to dissolve the plugging piece 200 and the ball seat body 100 in the well liquid to achieve the inner diameter of the pipe, thereby avoiding the pressure wave and radial rebound of the pipe string caused by the sudden loss of pressure when the ball seat body 100 and the plugging piece 200 are knocked down by continuing to pressurize, thereby avoiding the upward movement of the pipe string and ensuring the normal operation of the energy storage depot. At the same time, it also avoids the situation where the energy storage depot cavity is fractured and loses its seal due to energy impact.

[0037] The following combination Figure 1-Figure 6 The structure and shape of the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well provided in this embodiment are described in detail:

[0038] In an optional solution of this embodiment, a dissolvable ball seat for setting a packer for a salt cavern energy storage injection and production well includes a ball seat body 100, a plugging member 200, a connecting nipple 300, a flow baffle 400 and a coupling 700, such as Figure 1 As shown. The ball seat body 100 is inserted into the connecting short section 300 and connected to the connecting short section 300, and the plugging piece 200 is seated in the ball seat body 100 to block the passage of the ball seat body 100; the ball seat body 100 and the plugging piece 200 are both made of soluble materials, and after the packer is set, the ball seat body 100 and the plugging piece 200 are dissolved to realize the inner diameter of the pipe. The connecting short section 300 includes a barrel 310 and a lower joint 320 threadedly connected to the lower end of the barrel 310, and a coupling 700 is connected to the upper end of the barrel 310 through an airtight thread. The flow baffle 400 is installed on the upper end of the ball seat body 100 by screws and is located above the sealing member 200. It is used to prevent the sealing member 200 from moving away from the ball seat body 100 due to the buoyancy of the liquid in the well during the entry into the well. When the sealing member 200 is pushed up by the liquid, it will be blocked by the flow baffle 400, and the liquid will flow upward through the through hole opened on the flow baffle 400, thereby reducing the resistance during the entry process.

[0039] In this embodiment, the soluble material is a soluble magnesium-based alloy, and the overflow baffle 400 is also made of the soluble material.

[0040] In an optional solution of this embodiment, the blocking member 200 includes a housing 210, a rupture disk 220, a pressure cap 230 and a dissolution agent, such as Figure 5 The shell 210 is a hollow structure, with a stepped through hole on the surface, which is connected to the inner cavity of the shell 210; the rupture disk 220 is installed on the stepped through hole of the shell 210, and the pressure cap 230 is threadedly connected to the shell 210 to press the rupture disk 220 on the step surface of the stepped through hole, thereby fixing the rupture disk 220 and making the rupture disk 220 and the shell 210 form a closed hollow cavity, and the hollow cavity contains a dissolution agent, which is used to accelerate the dissolution of the soluble material to shorten the waiting time.

[0041] After the rupture disk 220 ruptures at the set pressure, the liquid in the well enters the hollow cavity and contacts the dissolution agent. Specifically, the dissolution agent includes a solid acid and a solid corrosion inhibitor, both of which are powdered and uniformly mixed. Among them, the solid acid can be aminosulfonic acid, and the solid corrosion inhibitor can be rhodin, the main component of which is a thiourea derivative. The corrosion inhibitor is used to protect the casing in the well from being corroded and damaged by the dissolved solid acid.

[0042] In this embodiment, the mass ratio of aminosulfonic acid to rhodin is 10:1 to 8:1.

[0043] To further accelerate dissolution, the dissolvable ball seat for setting the packer of the salt cavern energy storage injection and production well also includes a shear pin 600, which is inserted into the ball seat body 100 and the connecting short joint 300 at the same time. The outer circle of the ball seat body 100 is provided with an annular groove, and the annular groove and the inner wall of the connecting short joint 300 form an annular accommodating chamber 101, and a dissolution agent is arranged in the annular accommodating chamber 101.

[0044] The shear pin 600 is made of brass, and its shearing pressure is greater than the setting pressure of the packer. After the pressure is increased to the set pressure, the shear pin 600 is sheared, and the ball seat body 100 moves downward and abuts against the connecting short section 300. Figure 2 , Figure 4 As shown, the fluid in the well enters the annular accommodation chamber 101 from the installation hole of the shear pin 600 on the connecting short section 300. Figure 2 In this embodiment, the number of mounting holes for the shear pins 600 on the connecting sub 300 is greater than the number of the shear pins 600, and the extra mounting holes serve as liquid passages to accelerate the contact between the liquid in the well and the solubilizing agent.

[0045] Specifically, the outer circle of the ball seat body 100 is provided with an annular boss, and the inner wall of the lower joint 320 is provided with a step. After the ball seat body 100 goes down a certain distance, the mounting hole of the shear pin 600 is connected with the annular accommodating cavity 101, and the annular boss abuts against the step of the lower joint 320, thereby keeping the space at the upper and lower ends of the ball seat body 100 unconnected.

[0046] In the optional scheme provided in this embodiment, the dissolution agent includes a solid acid, a solid corrosion inhibitor and a solid base. In order to avoid premature contact reaction between the solid base and the solid acid, the solid base is wrapped in glutinous rice paper. Similarly, the solid acid and the solid corrosion inhibitor are in powder form and are evenly mixed, and the solid base is in powder form. Specifically, the solid acid is aminosulfonic acid, the solid corrosion inhibitor is rhodin, and the solid base is sodium hydroxide. The mass ratio of aminosulfonic acid to rhodin is 10:1 to 8:1, and the mass ratio of sodium hydroxide to aminosulfonic acid is 2:10 to 2:8. After the liquid in the well contacts the dissolution agent, the moisture dissolves the glutinous rice paper. Heat is released in the process of sodium hydroxide dissolving in water and reacting with aminosulfonic acid, thereby increasing the ambient temperature to accelerate the dissolution rate of the soluble magnesium-based alloy.

[0047] In this embodiment, the blocking member 200 may be configured as a spherical structure, such as Figure 5 As shown, since the position of the rupture disk 220 on the spherical structure cannot be fixed, at least five rupture disks 220 are evenly distributed on the surface of the spherical structure to ensure that at least one rupture disk 220 is in contact with the liquid above the ball seat body 100, thereby ensuring that the rupture disk 220 is ruptured by pressure, and then the liquid in the well is in contact with the solubilizing agent.

[0048] In an optional solution of this embodiment, the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well further includes a spring 500, and the plugging member 200 includes a shell 210, a rupture disk 220, a pressure cap 230 and a dissolution agent. The shell 210 includes a half shell 211 and a top plate 212, and the two are connected by screws, such as Figure 3 , Figure 6 As shown. The half shell 211 and the top plate 212 form a hollow cavity for containing the solubilizing agent, the rupture disk 220 is installed on the top plate 212, and the half shell 211 is used to block the channel of the ball seat body 100. A guide column is provided on the flow baffle 400; the spring 500 is sleeved on the guide column, one end of which abuts against the flow baffle 400, and the other end abuts against the top plate 212, and is used to apply a thrust downward to make the plugging member 200 seat into the ball seat body 100. During the lowering process, due to the resistance of the liquid in the well, the plugging member 200 leaves the ball seat body 100 for a distance and compresses the spring 500, thereby reducing the resistance to entering the well. The spring 500 can keep the plugging member 200 from deviating, and ensure that the plugging member 200 reliably blocks the channel of the ball seat body 100 when the subsequent pressurization is applied to seal the packer.

[0049] In this embodiment, the rupture disk 220 is made of tempered glass, and its crushing pressure is greater than the shearing pressure of the shear pin 600.

[0050] In this embodiment, sealing rings are installed on both the sealing member 200 and the ball seat body 100 to ensure sealing. The sealing rings are made of degradable rubber. The heat released by the solid alkali dissolving in water and reacting with the solid acid can accelerate the degradation of the sealing rings.

[0051] In this embodiment, the connecting nipple 300 and the coupling 700 are made of steel, and a laser cladding method is used to form an anti-corrosion protective layer on the surface. The anti-corrosion protective layer is made of 625 alloy and has a thickness of not less than 0.5 mm.

[0052] The working process of the soluble ball seat for setting the packer of the salt cavern energy storage injection and production well provided in this embodiment is as follows:

[0053] When entering the well, the liquid in the well lifts the through hole on the flow baffle 400 of the plugging piece 200 and flows upward to reduce the resistance of the well entering process. After the packer string is lowered to the designed position, the plugging piece 200 forms a blockage on the channel of the ball seat body 100. Then, pressure is injected into the inside of the packer string from the wellhead until the packer setting pressure value designed for the packer is reached to complete the packer setting. Then, the pressure is continued to be sheared so that the shear pin 600 is cut off, and the ball seat body 100 and the plugging piece 200 descend until the ball seat body 100 abuts against the lower joint 320. At this time, the liquid in the well contacts the solubilizing agent in the annular accommodating chamber 101. The pressure is continued to be applied until the rupture disk 220 ruptures, and the liquid in the well enters the hollow cavity of the plugging piece 200 and contacts the solubilizing agent. At this time, the wellhead pressure can be removed to avoid pressure loss after the ball seat body 100 and the sealing component 200 are dissolved. That is, after shutting down the well and waiting for a period of time, the high-mineralized brine in the injection and production well is mixed with a dissolving agent to undergo an electrolytic reaction with the soluble magnesium-based alloy to achieve dissolution. The dissolved precipitates and other small parts such as screws and rupture disk 220 fragments fall to the bottom of the well. At this time, only the connected coupling 700 and the connecting short section 300 remain at the lower end of the packer of the injection and production string, thereby realizing the internal diameter of the string and not hindering the subsequent injection and production construction.

[0054] Specifically, the dissolution agent combines with the inflowing underground high-mineralization brine to form a liquid acidic medium and an alkaline medium, a part of the acidic medium reacts with the plugging member 200 and the ball seat body 100, and the other part reacts with the alkaline medium to generate heat, thereby accelerating the dissolution of the plugging member 200 and the ball seat body 100 and the degradation of the soluble rubber. It should be noted that when the dissolution agent includes a solid base, an alkaline medium will be formed; when the dissolution agent does not include a solid base, an alkaline medium will not be formed.

[0055] When the conventional structure is pressed down to knock off the ball seat, the actual shear pressure of the shear pin installed on the ball seat does not match the design value. When the actual force value is too low, the ball seat knockout pressure is lower than the packer setting pressure, which causes the packer to fail to be completely set; when the actual value is too high, it is difficult to knock off the ball seat, and even overpressure causes damage to the wellhead and casing. The soluble ball seat for the packer setting of the salt cavern energy storage injection and production well provided in this embodiment realizes the diameter by dissolving, which can avoid the problem caused by inaccurate shear pin pressure value.

[0056] The soluble ball seat for sealing the salt cavern energy storage injection and production well provided in this embodiment can achieve the goal of not having to knock out the ball seat by holding pressure after the sealing of the packer is completed, and the dissolution-aiding agent preset inside the sealing tool and the high-mineralization brine in the salt cavern type energy storage reservoir can be used to degrade and disappear the existing ball seat, thereby effectively avoiding accidents such as upward movement of the injection and production string and cavity fracturing due to instantaneous loss of pressure in the injection and production string, as well as complications caused by unstable actual shear pressure value of the shear pin of the sealing ball seat.

[0057] The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well provided in this embodiment has the following advantages.

[0058] Efficient operation: No need to drop the ball at the wellhead, after the string is in place, the packer can be set by directly pressurizing the wellhead.

[0059] Good sealing effect: Different from the conventional shear pin-controlled ball seat type products, there is no need to consider the shear pressure value of the shear pin. In order to make the packer set more completely, a certain safety sealing pressure can be arbitrarily added on the basis of the packer design sealing pressure value.

[0060] High safety: After the packer is set, there is no need to remove the ball seat. The pressure in the injection and production string can be slowly released through the wellhead, thereby avoiding energy rebound and string retraction vibration caused by sudden release of string pressure. It is of great benefit to the overall strength and sealing performance of the injection and production string. At the same time, it will not impact the energy storage cavity, which is beneficial to protecting the overall sealing of the energy storage cavity. It plays a very critical role in the safe implementation and reliable operation of the overall project.

[0061] Easy to operate: During construction, only pressure and pressure relief construction is required through the wellhead, which saves the construction steps such as throwing the ball at the wellhead and knocking off the ball seat, and reduces the difficulty of operation and labor intensity.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A soluble ball seat for setting a packer for a salt cavern energy storage injection and production well, characterized in that: The invention comprises a ball seat body (100), a plugging piece (200) and a connecting short joint (300); the ball seat body (100) is inserted into the connecting short joint (300) and connected to the connecting short joint (300), and the plugging piece (200) is seated in the ball seat body (100) to block the passage of the ball seat body (100); the ball seat body (100) and the plugging piece (200) are both made of soluble materials, and after the packer is set, the ball seat body (100) and the plugging piece (200) are dissolved to realize the inner diameter of the pipe; The blocking member (200) comprises a shell (210), a rupture disk (220) and a dissolution-promoting agent; The rupture disk (220) is installed on the shell (210) and forms a hollow cavity with the shell (210), wherein the dissolution-aiding agent is contained in the hollow cavity; The blocking member (200) further comprises a pressing cap (230), wherein the pressing cap (230) is mounted on the housing (210) to press the rupture disk (220) against the housing (210); It also includes a flow baffle (400), wherein the flow baffle (400) is installed on the upper end of the ball seat body (100) and is located above the blocking member (200); The flow baffle (400) is provided with a through hole; It also includes a spring (500), wherein the spring (500) is used to apply a thrust to the blocking member (200) so as to push the blocking member (200) to move toward the ball seat body (100).

2. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 1 is characterized in that: The soluble material is a soluble magnesium-based alloy.

3. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 1 is characterized in that: After the rupture disk (220) ruptures at a set pressure, the liquid in the well enters the hollow cavity and contacts the solubilizing agent.

4. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 3 is characterized in that: It also includes a shear pin (600), wherein the shear pin (600) is inserted into the ball seat body (100) and the connecting short section (300) at the same time; The outer circle of the ball seat body (100) is provided with an annular groove, and the annular groove and the inner wall of the connecting short section (300) form an annular accommodating cavity (101), and the solubilizing agent is arranged in the annular accommodating cavity (101); After pressurizing to a set pressure, the shear pin (600) is sheared off, the ball seat body (100) moves downward and abuts against the connecting nipple (300), and the well fluid enters the annular accommodating chamber (101) from the mounting hole of the shear pin (600) on the connecting nipple (300).

5. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 4 is characterized in that: The dissolution aid comprises a solid acid and a solid corrosion inhibitor.

6. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 4 is characterized in that: The dissolution aid comprises a solid acid, a solid corrosion inhibitor and a solid base, and the solid base is wrapped in glutinous rice paper.

7. The soluble ball seat for setting the packer of the salt cavern energy storage injection and production well according to claim 5 or 6, characterized in that: The solid acid is aminosulfonic acid, and the solid corrosion inhibitor is rhodine.

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