An ultrahigh-temperature and ultrahigh-pressure acid rock reaction simulation device and experimental method

Abstract

This invention relates to the field of oil and gas extraction technology, and discloses an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device and experimental method. The device includes a reaction vessel, an acid inlet pipe, a high-pressure gas inlet pipe, and a connecting pipe. A magnetic coupler is fixedly installed at the top of the reaction vessel. A rotating shaft is rotatably connected inside the reaction vessel. A disk is fixedly connected to the top of the rotating shaft. An auxiliary component is fixedly installed inside the rotating shaft. The auxiliary component includes an air bladder. A gas guide pipe is fixedly installed inside the air bladder. A fixed column is fixedly connected to the end of the gas guide pipe away from the air bladder. Multiple telescopic plates are slidably connected inside the fixed column. An elastic element is fixedly installed at the end of the fixed column away from the reaction vessel. The telescopic plates automatically extend as the rotating shaft rotates, individually agitating the acid at the rock face, more closely resembling the actual flow state of downhole acid in fractures, thus improving the fidelity of the experimental simulation.

Description

Technical Field

[0001] This invention relates to the field of oil and gas extraction technology, specifically to an ultra-high temperature and ultra-high pressure acid rock reaction simulation device and experimental method. Background Technology

[0002] In the development of deep and ultra-deep carbonate oil and gas reservoirs, acid fracturing is a core technology for improving reservoir permeability and achieving efficient oil and gas extraction. The ultra-high temperature and ultra-high pressure acid rock reaction simulation device can realistically reproduce downhole temperature, pressure, fluid flow and acid rock reaction kinetics, providing key experimental support for the optimization of acid system, design of construction parameters and research on reaction mechanism. It is an important basic equipment for the research and development and field application of acid fracturing technology.

[0003] However, in existing experiments, when the acid in the reactor is stirred, the acid at the end face of the rock disk inside is mostly in a regular laminar flow state, which is significantly different from the complex and irregular real flow pattern in the downhole fracture. The authenticity of the test data and the fidelity of the simulation are low. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device and experimental method, which solves the problem that the acid at the rock face is mostly in a regular laminar flow state, resulting in low accuracy of detection data and simulation fidelity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device, comprising a reaction vessel, an acid input pipe, a high-pressure gas input pipe, and a connecting pipe. A magnetic coupler is fixedly installed at the top of the reaction vessel. A rotating shaft is rotatably connected inside the reaction vessel. A disk is fixedly connected at the top of the rotating shaft. An auxiliary component is fixedly installed inside the rotating shaft. The auxiliary component includes an air bladder. A gas guide pipe is fixedly installed inside the air bladder. A fixed column is fixedly connected to the end of the gas guide pipe away from the air bladder. Multiple telescopic plates are slidably connected inside the fixed column. An elastic element is fixedly installed at the end of the fixed column away from the reaction vessel. The end of the elastic element is fixedly installed inside the fixed column. A rock disk holder is fixedly installed inside the reaction vessel. An isolation disk is fixedly connected inside the reaction vessel. A heating coil is installed below the isolation disk.

[0006] Preferably, the auxiliary component further includes a fixed disk, the outer wall of which is fixedly connected to the inside of the rotating shaft, and a plurality of centrifugal blocks are slidably connected inside the fixed disk. An elastic element is fixedly provided on the outer wall of each centrifugal block, and the end of the elastic element away from the centrifugal block is fixedly provided inside the fixed disk. A slider is fixedly connected to the lower surface of each centrifugal block, and the outer wall of the slider is attached to the outer wall of the airbag. The outer wall of the slider is slidably connected to the inside of the fixed disk.

[0007] Preferably, a connecting rod is fixedly connected to the outer wall of the fixed column, the outer wall of the connecting rod is fixedly connected to and inserted through the bottom end of the rotating shaft, and an agitation assembly is installed at the bottom end of the connecting rod. The agitation assembly includes a limiting rod, and a fixing frame is fixedly connected to the bottom end of the limiting rod. The outer wall of the fixing frame is fixedly disposed inside the reactor.

[0008] Preferably, the agitation assembly further includes a reciprocating lead screw, the top end of which is mounted on the bottom end of a connecting rod. A sliding disc is threadedly connected to the outer wall of the reciprocating lead screw, and the interior of the sliding disc is slidably connected to the outer wall of a limiting rod. The bottom end of the reciprocating lead screw is rotatably connected to the interior of a fixed frame, and the outer wall of the sliding disc is slidably connected to the interior of a reaction vessel.

[0009] Preferably, a rotating rod is rotatably connected inside the fixed frame, a fan blade is fixedly connected to the bottom end of the rotating rod, and a vibration assembly is fixedly installed inside the rotating rod. The vibration assembly includes multiple hammers, and an arc-shaped block is attached to the outer wall of the hammers. The outer wall of the arc-shaped block is fixedly connected to the inner wall of the pipe.

[0010] Preferably, the vibration assembly further includes a second fixed column, the outer wall of which is fixedly connected to the inside of the rotating rod. A plurality of sliding columns are slidably connected inside the second fixed column. The outer wall of the sliding column is fixedly connected to the inside of the hammer. An elastic element three is fixedly provided at the end of the sliding column away from the hammer. The end of the elastic element three away from the sliding column is fixedly provided inside the second fixed column.

[0011] Preferably, the gas guide pipe is installed inside the rotating shaft, the outer wall of the first fixed column is fixedly connected to the inside of the rotating shaft, and the outer wall of the heating coil is fixedly installed on the inner bottom wall of the reactor.

[0012] Preferably, the interior of the fixed column is provided with a sliding groove, and the size of the sliding groove is adapted to the telescopic plate.

[0013] Preferably, the sliding disk has multiple pressure relief holes inside to balance the pressure above and below the sliding disk.

[0014] Preferably, an experimental method for simulating ultra-high temperature and ultra-high pressure acid-rock reaction is used in an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device, the experimental method comprising the following steps:

[0015] S1. Fix the rock plate inside the reactor using the rock plate holder to complete the reactor sealing;

[0016] S2. Inject preheated acid into the reactor through the acid inlet pipe, turn on the heating coil to maintain the acid temperature, and pressurize the reactor to the experimental pressure through the high-pressure gas inlet pipe. The temperature range is 150℃~250℃ and the pressure range is 50MPa~150MPa.

[0017] S3. Start the magnetic coupler to drive the disk and rotating shaft to rotate. The auxiliary component compresses the air bag under centrifugal force. The gas enters the fixed column through the gas pipe and pushes the telescopic plate out to disturb the acid on the end face of the rock disk. At the same time, the rotating shaft drives the reciprocating screw to rotate through the connecting rod, so that the sliding disk slides up and down along the limit rod to form turbulent stirring of the acid in the reactor.

[0018] S4. Stop the magnetic coupler. The telescopic plate automatically resets under the action of the elastic element 2. After depressurizing the reactor, the acid is discharged through the external pump connected to the pipe. The flow of acid drives the fan blade and the vibration component to rotate. The hammer periodically hits the pipe to generate vibration, preventing the acid from sticking to the inner wall of the reactor.

[0019] S5. After the acid solution is completely drained, open the reaction vessel and remove the rock mass. Analyze the acid solution and rock mass after the reaction to obtain reaction data and complete the experiment.

[0020] This invention provides an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device and experimental method. It has the following beneficial effects:

[0021] 1. This invention automatically extends a telescopic plate while the rotating shaft rotates, allowing for separate agitation of the acid at the rock face. This more closely resembles the actual flow state of downhole acid in fractures, improving the fidelity of the experimental simulation. When the rotating shaft stops rotating, the telescopic plate automatically retracts to avoid obstructing the workers from removing the rock. Furthermore, the magnetic coupler prevents the traditional rotating shaft from being inserted into the reactor, which leads to poor sealing performance and affects the internal pressure of the reactor.

[0022] 2. This invention achieves efficient agitation of acidic liquid in the reactor by sliding the sliding disk. Even when conducting a simulation experiment of acid-rock reaction with high-viscosity acid, the flow of acid is still turbulent. This solves the problem of inaccurate hydrogen ion concentration measurement due to uneven stirring when using high-viscosity acid. In addition, it can be used in conjunction with auxiliary components and telescopic plates to make the acid at the end face of the rock disk exhibit irregular flow, further improving the authenticity of the final detection data.

[0023] 3. This invention uses the collision between the hammer and the through pipe to transmit the vibration to the entire reactor, thereby preventing acid from adhering to the reactor walls when discharging acid from inside the reactor, which would affect the normal use of the reactor afterwards. Attached Figure Description

[0024] Figure 1This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a partial structural diagram of the reaction vessel of the present invention;

[0026] Figure 3 This is a partial structural diagram of the connecting rod of the present invention;

[0027] Figure 4 This is a partial structural diagram of the fixed disk of the present invention;

[0028] Figure 5 This is a schematic diagram of a partial structure of the fan blade of the present invention;

[0029] Figure 6 This is a schematic diagram of a partial structure of the hammer of the present invention.

[0030] The components include: 1. Reactor; 2. Acid inlet pipe; 3. High-pressure gas inlet pipe; 4. Through pipe; 5. Magnetic coupler; 6. Disk disk; 7. Rotating shaft; 8. Auxiliary components; 81. Fixed disk; 82. Centrifuge block; 83. Elastic component one; 84. Slider; 85. Airbag; 9. Gas guide pipe; 10. Fixed column one; 11. Telescopic plate; 12. Elastic component two; 13. Connecting rod; 14. Stirring assembly; 141. Reciprocating screw; 142. Sliding disk; 143. Limiting rod; 15. Fixed frame; 16. Rotating rod; 17. Fan blade; 18. Vibration assembly; 181. Fixed column two; 182. Sliding column; 183. Hammer; 184. Elastic component three; 19. Arc block; 20. Rock disk holder; 21. Isolation disk; 22. Heating coil. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see the appendix Figure 1 - Appendix Figure 4This invention provides an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device, including a reaction vessel 1, an acid input pipe 2, a high-pressure gas input pipe 3, and a connecting pipe 4. A magnetic coupler 5 is fixedly installed at the top of the reaction vessel 1. A rotating shaft 7 is rotatably connected inside the reaction vessel 1. A disk 6 is fixedly connected at the top of the rotating shaft 7. An auxiliary component 8 is fixedly installed inside the rotating shaft 7. The auxiliary component 8 includes an air bladder 85. A gas guide pipe 9 is fixedly installed inside the air bladder 85. A fixed column 10 is fixedly connected at the end of the gas guide pipe 9 away from the air bladder 85. Multiple telescopic plates 11 are slidably connected inside the fixed column 10. An elastic element 22 is fixedly installed at the end of the fixed column 10 away from the reaction vessel 1. The end of the elastic element 22 away from the fixed column 10 is fixedly installed inside the fixed column 10. A rock disk holder 20 is fixedly installed inside the reaction vessel 1. An isolation disk 21 is fixedly connected inside the reaction vessel 1. A heating coil 22 is installed below the isolation disk 21.

[0033] Specifically, firstly, the rock disk is fixed inside the reactor 1 using the rock disk holder 20. Then, the reactor 1 is sealed. Preheated acid is supplied to the reactor 1 via the acid inlet pipe 2 through an external control device. Simultaneously, the heating coil 22 is activated to maintain the acid at the ideal temperature. Next, high-pressure gas is introduced into the reactor 1 through the high-pressure gas inlet pipe 3 for pressurization. Heating jackets or multiple independently temperature-controlled heating coils can also be installed around the reactor 1 and the rock disk holder 20 to ensure a uniform temperature field for the fluid and the rock disk cross-section. After completing the above process, the magnetic coupler 5 is controlled by the external control device to rotate at a preset speed, further driving the disk 6 to rotate inside the reactor 1. When the disk 6 rotates, the fixing action between the disk 6 and the rotating shaft 7 drives the rotating shaft 7 to rotate, further driving the internal auxiliary components 8 to rotate synchronously. The airbag 85 is then compressed. The airbag 85 is made of acid-resistant and high-temperature-resistant metal bellows, and its interior is filled with high-pressure inert gas to balance the initial internal pressure with the external pressure of the reactor 1. The gas generated by compressing the airbag 85 is transported to the interior of the fixed column 10 through the gas guide pipe 9, which further pushes the internal telescopic plate 11 to slide out. At the same time as it slides out, it cooperates with the fixed column 10 to stretch the elastic element 12. This allows the telescopic plate 11 to automatically extend while the rotating shaft 7 is rotating, so as to separately agitate the acid on the rock face. This is closer to the actual flow state of the acid in the fracture in the well, improving the fidelity of the experimental simulation. When the rotating shaft 7 stops rotating, the telescopic plate 11 automatically retracts to avoid obstructing the workers from taking out the rock. At the same time, the magnetic coupler 5 can also avoid the problem of the traditional rotating shaft being inserted into the reactor 1, which leads to poor sealing performance and affects the internal pressure of the reactor 1.

[0034] Please see the appendix Figure 2 - Appendix Figure 4The auxiliary component 8 also includes a fixed disk 81. The outer wall of the fixed disk 81 is fixedly connected to the inside of the rotating shaft 7. Multiple centrifugal blocks 82 are slidably connected inside the fixed disk 81. An elastic element 83 is fixedly provided on the outer wall of the centrifugal block 82. One end of the elastic element 83 away from the centrifugal block 82 is fixedly provided inside the fixed disk 81. A slider 84 is fixedly connected to the lower surface of the centrifugal block 82. The outer wall of the slider 84 is attached to the outer wall of the airbag 85. The outer wall of the slider 84 is slidably connected to the inside of the fixed disk 81.

[0035] Specifically, when the rotating shaft 7 rotates, the fixed disk 81 is driven to rotate by the fixing action of the rotating shaft 7 and the fixed disk 81. At this time, the centrifugal force generated by the rotation of the fixed disk 81 will drive the centrifugal block 82 inside to slide in opposite directions. While sliding, it cooperates with the fixed disk 81 to compress the elastic element 83. When the centrifugal block 82 slides, the fixed action of the centrifugal block 82 and the slider 84 will drive the slider 84 to slide inside the fixed disk 81, further compressing the internal airbag 85. When the rotating shaft 7 stops rotating, the elastic element 83 and the elastic element 12 will release their own elastic force to reset the centrifugal block 82 and the telescopic plate 11, making it convenient for the operator to remove the rock plate.

[0036] Please see the appendix Figure 2 - Appendix Figure 4 A connecting rod 13 is fixedly connected to the outer wall of the fixed column 10. The outer wall of the connecting rod 13 is fixedly connected to and inserted into the bottom end of the rotating shaft 7. An agitation assembly 14 is installed at the bottom end of the connecting rod 13. The agitation assembly 14 includes a limiting rod 143. A fixing frame 15 is fixedly connected to the bottom end of the limiting rod 143. The outer wall of the fixing frame 15 is fixedly set inside the reactor 1. The agitation assembly 14 also includes a reciprocating screw 141. The top end of the reciprocating screw 141 is installed at the bottom end of the connecting rod 13. A sliding disk 142 is threadedly connected to the outer wall of the reciprocating screw 141. The interior of the sliding disk 142 is slidably connected to the outer wall of the limiting rod 143. The bottom end of the reciprocating screw 141 is rotatably connected to the interior of the fixing frame 15. The outer wall of the sliding disk 142 is slidably connected to the interior of the reactor 1. Multiple pressure relief holes are opened inside the sliding disk 142 to balance the pressure above and below the sliding disk 142.

[0037] Specifically, when the fixed column 10 rotates, the fixing action of the fixed column 10 and the connecting rod 13 will drive the connecting rod 13 to rotate, which in turn drives the reciprocating screw 141 to rotate inside the fixed frame 15. When the reciprocating screw 141 rotates, the threaded connection between the reciprocating screw 141 and the sliding plate 142 will drive the sliding plate 142 to slide up and down on the outer wall of the limiting rod 143. The surfaces of the contact points between the reciprocating screw 141 and the sliding plate 142 are treated with a PEEK coating to prevent rock debris from getting stuck. Meanwhile, the internal openings... Multiple pressure relief holes maintain the pressure above and below the sliding disk 142, ensuring that the sliding disk 142 can slide up and down normally and stably. Through the sliding of the sliding disk 142, the acidic liquid in the reactor 1 is efficiently stirred. Even when conducting a high-viscosity acid-rock reaction simulation experiment, the flow of the acid is still turbulent. This solves the problem of inaccurate hydrogen ion concentration measurement caused by uneven stirring when using high-viscosity acid. In addition, it can cooperate with the auxiliary component 8 and the telescopic plate 11 to make the acid at the end face of the rock disk exhibit irregular flow, further improving the authenticity of the final detection data.

[0038] Please see the appendix Figure 4 - Appendix Figure 6 The fixed frame 15 has a rotating rod 16 rotatably connected inside, and a fan blade 17 is fixedly connected to the bottom end of the rotating rod 16. A vibration assembly 18 is fixedly installed inside the rotating rod 16. The vibration assembly 18 includes multiple hammers 183, with an arc-shaped block 19 attached to the outer wall of each hammer 183. The outer wall of the arc-shaped block 19 is fixedly connected to the inner wall of the through pipe 4. The vibration assembly 18 also includes a second fixed column 181, whose outer wall is fixedly connected to the inside of the rotating rod 16. Multiple sliding columns 182 are slidably connected inside the second fixed column 181. The outer wall of the sliding column 182 is fixedly connected to the inside of the hammer 183. An elastic element 3 184 is fixedly installed at the end of the sliding column 182 away from the hammer 183. The end of the elastic element 3 184 away from the sliding column 182 is fixedly installed inside the fixed column 2 181. The gas guide pipe 9 is installed inside the rotating shaft 7. The outer wall of the fixed column 10 is fixedly connected to the inside of the rotating shaft 7. The outer wall of the heating coil 22 is fixedly installed on the inner bottom wall of the reactor 1. A sliding groove is opened inside the fixed column 10, and the size of the sliding groove is adapted to the telescopic plate 11.

[0039] Specifically, pipe 4 is used to connect to an external pump. When reactor 1 stops working and needs to discharge its internal acid, the pressure inside reactor 1 is first released through the external main control device, and then the pump is turned on to extract the acid from reactor 1. During extraction, the flow rate of the acid itself drives the fan blade 17 to rotate, which in turn drives the internal fixed column 181 to rotate synchronously. When the fixed column 181 rotates, it drives the internal sliding column 182 and elastic element 184 to rotate. Elastic element 183, elastic element 12, and elastic element 184 can be steel leaf springs, coil springs, torsion bar springs, rubber springs, etc., preferably coil springs. When the sliding column 182 rotates, the fixing action of the sliding column 182 and the hammer 183 drives the hammer 183 to rotate. The hammer 183 rotates for a period of time and then rotates with the arc-shaped... When block 19 comes into contact, it will drive sliding column 182 to move in the center inside fixed column 181. While moving, it will cooperate with fixed column 181 to compress elastic element 184. Then fixed column 181, sliding column 182, hammer 183 and elastic element 184 continue to rotate. When hammer 183 rotates and disengages from arc block 19, elastic element 184 will release its own elasticity to reset sliding column 182, and further reset hammer 183 to contact pipe 4, which will generate slight vibration and transmit the vibration to the entire reactor 1. Through the collision of hammer 183 and pipe 4, the vibration is transmitted to the entire reactor 1, thereby avoiding acid from adhering to the inside of reactor 1 when discharging acid, which would affect the normal use of reactor 1.

[0040] Please see the appendix Figure 1 - Appendix Figure 6 An experimental method for simulating acid-rock reaction at ultra-high temperature and ultra-high pressure, used in an ultra-high temperature and ultra-high pressure acid-rock reaction simulation device, includes the following steps:

[0041] S1. Fix the rock plate inside the reactor 1 using the rock plate holder 20 to complete the sealing of the reactor 1;

[0042] S2. Inject preheated acid into reactor 1 through acid inlet pipe 2, turn on heating coil 22 to maintain acid temperature, and pressurize reactor 1 to experimental pressure through high pressure gas inlet pipe 3. The temperature range is 150℃~250℃ and the pressure range is 50MPa~150MPa.

[0043] S3. Start the magnetic coupler 5 to drive the disk 6 and the rotating shaft 7 to rotate. The auxiliary component 8 compresses the air bag 85 under centrifugal action. The gas enters the fixed column 10 through the gas guide pipe 9 and pushes the telescopic plate 11 to extend, disturbing the acid liquid on the end face of the rock disk. At the same time, the rotating shaft 7 drives the reciprocating screw 141 to rotate through the connecting rod 13, so that the sliding disk 142 slides up and down along the limiting rod 143, forming turbulent stirring of the acid liquid in the reaction vessel 1.

[0044] S4. Stop the magnetic coupler 5. The telescopic plate 11 automatically resets under the action of the elastic element 12. After depressurizing the reactor 1, the acid is discharged through the external pump connected to the pipe 4. The acid flow drives the fan blade 17 and the vibration component 18 to rotate. The hammer 183 periodically hits the pipe 4 to generate vibration, preventing the acid from sticking to the inner wall of the reactor 1.

[0045] S5. After the acid solution is completely discharged, open reaction vessel 1 and remove the rock disk. Analyze the acid solution and rock disk after the reaction to obtain reaction data and complete the experiment.

[0046] Workflow: When the fixed column 10 rotates, the reciprocating screw 141 is driven to rotate within the fixed frame 15 via the connecting rod 13. At this time, through the threaded engagement between the reciprocating screw 141 and the sliding disk 142, the sliding disk 142 slides up and down along the outer wall of the limiting rod 143. The pressure relief hole opened in the sliding disk 142 is used to balance the pressure above and below it, ensuring smooth sliding. The up and down sliding of the sliding disk 142 can efficiently stir the acidic liquid in the reactor 1, maintaining a turbulent state in the high-viscosity acid rock reaction simulation experiment. This avoids inaccurate hydrogen ion concentration detection due to uneven stirring and can also work with the auxiliary component 8 and the telescopic plate 11 to make the acid liquid on the end face of the rock disk form an irregular flow, improving the accuracy of the detection data.

[0047] The external pump is connected to the pipe 4. When the reactor 1 stops and discharges acid, the internal pressure of the reactor 1 is first released, and then the pump is started to extract the acid. The flow of acid drives the fan blade 17 to rotate, which in turn drives the fixed column 181 to rotate synchronously. When the fixed column 181 rotates, it drives the sliding column 182 and the elastic element 184 to rotate, which in turn drives the hammer 183 to rotate. When the hammer 183 touches the arc block 19, it pushes the sliding column 182 to move in the center within the fixed column 181 and compresses the elastic element 184. When the hammer 183 continues to rotate until it leaves the arc block 19, the elastic element 184 releases energy and resets, causing the hammer 183 to rebound and hit the pipe 4 to generate micro-vibration. The vibration is transmitted to the entire reactor 1, thereby preventing acid from sticking to the inner wall of the reactor 1 during discharge and ensuring the normal operation of the equipment in the future.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature and high-pressure acid-rock reaction simulation device, comprising a reaction vessel (1), an acid input pipe (2), a high-pressure gas input pipe (3), and a connecting pipe (4), characterized in that: A magnetic coupler (5) is fixedly installed at the top of the reactor (1). A rotating shaft (7) is rotatably connected inside the reactor (1). A disk (6) is fixedly connected at the top of the rotating shaft (7). An auxiliary component (8) is fixedly installed inside the rotating shaft (7). The auxiliary component (8) includes an air bladder (85). A gas guide pipe (9) is fixedly installed inside the air bladder (85). A fixed column (10) is fixedly connected at the end of the gas guide pipe (9) away from the air bladder (85). Multiple telescopic plates (11) are slidably connected inside the fixed column (10). An elastic element (12) is fixedly installed at the end of the fixed column (10) away from the reactor (1). The end of the elastic element (12) away from the fixed column (10) is fixedly installed inside the fixed column (10). A rock plate holder (20) is fixedly installed inside the reactor (1). An isolation plate (21) is fixedly connected inside the reactor (1). A heating coil (22) is installed below the isolation plate (21).

2. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 1, characterized in that: The auxiliary component (8) also includes a fixed disk (81), the outer wall of which is fixedly connected to the inside of the rotating shaft (7). Multiple centrifugal blocks (82) are slidably connected inside the fixed disk (81). An elastic element (83) is fixedly provided on the outer wall of the centrifugal block (82). One end of the elastic element (83) away from the centrifugal block (82) is fixedly provided inside the fixed disk (81). A slider (84) is fixedly connected to the lower surface of the centrifugal block (82). The outer wall of the slider (84) is attached to the outer wall of the airbag (85). The outer wall of the slider (84) is slidably connected inside the fixed disk (81).

3. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 1, characterized in that: A connecting rod (13) is fixedly connected to the outer wall of the fixed column (10). The outer wall of the connecting rod (13) is fixedly connected to and inserted into the bottom end of the rotating shaft (7). A stirring assembly (14) is installed at the bottom end of the connecting rod (13). The stirring assembly (14) includes a limiting rod (143). A fixing frame (15) is fixedly connected to the bottom end of the limiting rod (143). The outer wall of the fixing frame (15) is fixedly set inside the reactor (1).

4. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 3, characterized in that: The stirring assembly (14) also includes a reciprocating screw (141), the top end of which is mounted on the bottom end of the connecting rod (13). The outer wall of the reciprocating screw (141) is threadedly connected to a sliding disk (142). The interior of the sliding disk (142) is slidably connected to the outer wall of the limiting rod (143). The bottom end of the reciprocating screw (141) is rotatably connected to the interior of the fixed frame (15). The outer wall of the sliding disk (142) is slidably connected to the interior of the reactor (1).

5. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 4, characterized in that: The fixed frame (15) is rotatably connected to a rotating rod (16), and a fan blade (17) is fixedly connected to the bottom end of the rotating rod (16). A vibration assembly (18) is fixedly installed inside the rotating rod (16). The vibration assembly (18) includes multiple hammers (183). An arc-shaped block (19) is attached to the outer wall of the hammer (183). The outer wall of the arc-shaped block (19) is fixedly connected to the inner wall of the through pipe (4).

6. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 5, characterized in that: The vibration assembly (18) also includes a second fixed column (181), the outer wall of which is fixedly connected to the inside of the rotating rod (16). Multiple sliding columns (182) are slidably connected inside the second fixed column (181). The outer wall of the sliding column (182) is fixedly connected to the inside of the hammer (183). An elastic element (184) is fixedly provided at one end of the sliding column (182) away from the hammer (183). The end of the elastic element (184) away from the sliding column (182) is fixedly provided inside the second fixed column (181).

7. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 1, characterized in that: The gas guide pipe (9) is installed inside the rotating shaft (7), the outer wall of the fixed column (10) is fixedly connected to the inside of the rotating shaft (7), and the outer wall of the heating coil (22) is fixedly set on the inner bottom wall of the reactor (1).

8. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 3, characterized in that: The fixed column (10) has a groove inside, and the size of the groove is adapted to the telescopic plate (11).

9. The ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to claim 4, characterized in that: The sliding disk (142) has multiple pressure relief holes inside, which are used to balance the pressure above and below the sliding disk (142).

10. A method for simulating acid-rock reactions at ultra-high temperature and ultra-high pressure, characterized in that... The experimental method for the ultra-high temperature and ultra-high pressure acid-rock reaction simulation device according to any one of claims 1-9 includes the following steps: S1. Fix the rock plate inside the reactor (1) using the rock plate holder (20) to complete the sealing of the reactor (1); S2. Inject preheated acid into the reactor (1) through the acid input pipe (2), turn on the heating coil (22) to maintain the acid temperature, and pressurize the reactor (1) to the experimental pressure through the high pressure gas input pipe (3). The temperature range is 150℃~250℃ and the pressure range is 50MPa~150MPa. S3. Start the magnetic coupler (5) to drive the disk (6) and the rotating shaft (7) to rotate. The auxiliary component (8) compresses the air bag (85) under centrifugal action. The gas enters the fixed column (10) through the gas pipe (9) and pushes the telescopic plate (11) to extend, disturbing the acid liquid on the end face of the rock disk. At the same time, the rotating shaft (7) drives the reciprocating screw (141) to rotate through the connecting rod (13), so that the sliding disk (142) slides up and down along the limiting rod (143) to form turbulent stirring of the acid liquid in the reactor (1). S4. Stop the magnetic coupler (5). The telescopic plate (11) automatically resets under the action of the elastic element (12). After depressurizing the reactor (1), the acid is discharged through the external pump connected to the pipe (4). The acid flow drives the fan blade (17) and the vibration component (18) to rotate. The hammer (183) periodically hits the pipe (4) to generate vibration, preventing the acid from sticking to the inner wall of the reactor (1). S5. After the acid solution is completely discharged, open the reaction vessel (1) and take out the rock plate. Analyze the acid solution and rock plate after the reaction to obtain the reaction data and complete the experiment.

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