A carbon dioxide cap stress and breakthrough experimental device

Abstract

The present invention discloses a carbon dioxide cap layer stress and breakthrough experimental device, including a bottom plate, a placement plate fixedly connected to the upper end of the bottom plate, two hydraulic telescopic rods symmetrically fixedly connected to the upper end of the bottom plate, a moving column arranged above the placement plate, a connecting block fixedly connected to the front and rear sides of the moving column, the telescopic ends of the two hydraulic telescopic rods fixedly connected to the lower end of the connecting block, six first columnar grooves are provided at the upper end of the placement plate, six pressurized grooves are provided at the lower end of the moving column, each pressurized groove cooperates with its corresponding first columnar groove; the inner top space of each pressurized groove is connected to the outside through a water inlet, and a plurality of pressure gauges are installed on the outer side wall of the moving column. In the specific use process, the experimental device can simulate different actual storage environments, so that the overall detection effect is more accurate, which is convenient for the actual selection and use of the cap layer.

Description

Technical Field

[0001] The invention relates to the field of carbon dioxide storage, and in particular to a carbon dioxide cap layer stress and breakthrough experimental device. Background Art

[0002] The CO2 cap layer refers to a low-permeability or non-permeable rock layer located above the underground reservoir during the geological storage of CO2. It is used to prevent the injected CO2 from leaking through faults or cracks to the upper freshwater layer or the surface. It acts as a barrier to prevent CO2 from migrating upward from the reservoir, ensuring long-term and stable storage of CO2 underground.

[0003] In the prior art, due to the different temperatures of the earth's crust and the different temperatures at which carbon dioxide is sealed, there is no device to simulate the stress state and breakthrough process of carbon dioxide in the geological cover layer. As a result, the actual sealing and safety of the cover layer cannot be supported by experimental data, resulting in the inability to select suitable cover layer materials for different environments during the cover layer selection process. Therefore, in order to solve the above problems, it is necessary to consider designing a carbon dioxide cover layer stress and breakthrough experimental device. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose a carbon dioxide cap stress and breakthrough experimental device. During specific use, the experimental device can simulate different actual storage environments, so that the overall detection effect is more accurate and convenient for the actual selection and use of the cap.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A carbon dioxide cap layer stress and breakthrough experimental device, comprising a base plate, a placing plate fixedly connected to the upper end of the base plate, two hydraulic telescopic rods symmetrically fixedly connected to the upper end of the base plate, a moving column is arranged above the placing plate, the front and rear sides of the moving column are fixedly connected to a connecting block, the telescopic ends of the two hydraulic telescopic rods are fixedly connected to the lower end of the connecting block, six first columnar grooves are opened at the upper end of the placing plate, six pressurizing grooves are opened at the lower end of the moving column, each of the pressurizing grooves cooperates with its corresponding first columnar groove; the inner top space of each pressurizing groove is connected to the outside through a water inlet, a plurality of pressure gauges are installed on the outer side wall of the moving column, each of the pressure gauges is used to detect the pressure in the corresponding pressurizing groove, and a sealing valve is installed on each of the water inlets; a gas injection mechanism, the gas injection mechanism is located at the upper end of the base plate, and the gas injection mechanism is used to inject carbon dioxide gas; a temperature regulating mechanism, the temperature regulating mechanism is used to change the temperature of carbon dioxide; an intermittent rotation mechanism, the intermittent rotation mechanism cooperates with the gas injection mechanism.

[0007] Preferably, an annular tube is provided on the outer side of the moving column, a vacuum pump is installed on the side wall of the moving column, an air inlet end of the vacuum pump is connected to the inside of the annular tube, and the annular tube is connected to multiple pressurized grooves through multiple connecting tubes.

[0008] Preferably, a solenoid valve is installed inside each of the connecting pipes, and the plurality of solenoid valves are electrically connected to the vacuum pump.

[0009] Preferably, the gas injection mechanism includes a rectangular block fixedly connected to the upper end of the base plate, a second columnar groove is opened at the upper end of the rectangular block, a second L-shaped mounting frame is installed on the right side of the rectangular block, a motor is installed on the second L-shaped mounting frame, the output shaft of the motor is fixedly connected to a rotating disk, a first piston plate that can slide up and down is arranged in the second columnar groove, a rotating connecting strip is arranged on the left side of the rotating disk, the other end of the connecting strip is rotatably connected to the upper end of the first piston plate, the inner bottom of the second columnar groove is connected to an air intake pipe, the inner bottom of the second columnar groove is connected to an injection pipe, and a one-way valve is installed inside each of the injection pipe and the air intake pipe.

[0010] Preferably, the temperature regulating mechanism includes a first L-shaped mounting frame fixedly connected to the upper end of the moving column, a vertical connecting pipe is penetrated through the horizontal portion of the first L-shaped mounting frame, the vertical connecting pipe is fixedly connected to the horizontal portion of the first L-shaped mounting frame, a rotating hollow disk is provided above the moving column, the rotating hollow disk is filled with temperature transfer oil, a rectangular hollow box is fixedly connected to the upper end of the moving column, a rotating tube is rotatably connected to the inner top of the rectangular hollow box, the upper end of the rotating tube penetrates the inner top of the rectangular hollow box and is fixedly connected to the lower end of the rotating hollow disk, and the upper end of the rotating tube extends to the interior of the rectangular hollow box.

[0011] Preferably, two rectangular bars are symmetrically fixedly connected to the upper end of the rectangular block, and the upper ends of the two rectangular bars are commonly fixedly connected to a piston cylinder. A second piston plate that can slide up and down is arranged in the piston cylinder, and two fixing rods are symmetrically fixedly connected to the lower end of the second piston plate, and the lower ends of the two fixing rods are fixedly connected to the upper end of the first piston plate. The inner top space of the piston cylinder is connected to the outside through an air inlet, and the inner top space of the piston cylinder is connected to an exhaust pipe. Both the air inlet and the exhaust pipe are equipped with a one-way valve, and the other end of the exhaust pipe extends to the bottom of the rectangular hollow box and is connected to the lower end of the rotating tube through a second rotating joint. Semiconductor refrigeration components are installed on the inner walls on both sides of the piston cylinder, and the cooling ends of the two semiconductor refrigeration components extend to the inside of the piston cylinder.

[0012] Preferably, the other end of the injection pipe is connected to the upper end of the vertical connecting pipe, and a serpentine pipe is installed inside the rotating hollow disk. The air inlet end of the serpentine pipe passes through the inner top of the rotating hollow disk and is connected to the lower end of the vertical connecting pipe through a first rotating joint. The lower end of the serpentine pipe passes through the inner bottom of the rotating hollow disk, and the inner top of each of the pressurizing grooves is connected to a vertical pipe. The upper ends of multiple vertical pipes are in contact with the lower end of the rotating hollow disk and are slidably connected.

[0013] Preferably, the intermittent rotation mechanism includes a plurality of exhaust channels respectively opened at the inner bottom of the first cylindrical groove, a gas flow rate sensor is installed at the inner bottom of each of the first cylindrical grooves, a magnetic slide plate which can slide left and right is arranged in the rectangular hollow box, an electromagnet is fixedly connected to the right inner wall of the rectangular hollow box, the left side of the electromagnet is electrically connected to the magnetic slide plate through a spring, a rack is fixedly connected to the left side of the magnetic slide plate, a gear is arranged on the outer side of the rotating tube, the gear is meshed with the rack, the gear is connected to the rotating tube through a one-way bearing, and the plurality of gas flow rate sensors are matched with the electromagnet.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Carbon dioxide will be continuously injected through the use of the gas injection mechanism. A pressure gauge is provided, which is an existing digital pressure gauge with a peak hold function. When this function is activated, the pressure gauge will record and display the highest pressure value measured since the last reset, thereby facilitating the recording of the maximum pressure of the breakthrough experiment and facilitating the calculation of stress.

[0016] 2. A temperature regulating mechanism is provided. By adjusting the use of the regulating mechanism, breakthrough detection in high temperature and high pressure environment, normal temperature and high pressure environment and low temperature and high pressure environment can be simulated.

[0017] 3. Through the use of water and the pressurization of carbon dioxide, breakthrough detection under acidic conditions of high temperature and high pressure environment, normal temperature and high pressure environment and low temperature and high pressure environment can be simulated, which is more in line with the actual environment.

[0018] 4. Equipped with gas flow sensor, electromagnet, rack, gear and one-way bearing and other structures, the simulation experiment can be completed automatically in sequence without the need for separate control by staff, which greatly facilitates the actual operation.

[0019] To sum up, the experimental device adopts automated operation as a whole during use, and there is no need for staff to operate it multiple times. In addition, it can simulate the breakthrough of carbon dioxide cap under high temperature and high pressure, high temperature and high pressure and high acid, normal temperature and high pressure, normal temperature and high pressure and high acid, low temperature and high pressure, and low temperature and high pressure and high acid environments, which conforms to the actual use environment and makes the actual data more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a carbon dioxide cap layer stress and breakthrough experimental device proposed by the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of a partial cross-section in the front-rear direction;

[0022] Figure 3 for Figure 1 A schematic diagram of a cross-section inclined in the front-rear direction;

[0023] Figure 4 for Figure 3 A magnified image of point A;

[0024] Figure 5 for Figure 1 A schematic cross-sectional view of a rectangular hollow box in the up and down directions;

[0025] Figure 6 for Figure 5 A magnified image of the rectangular hollow box;

[0026] Figure 7 for Figure 1 Schematic diagram of a cross section of the moving column in the up and down directions.

[0027] In the figure: 1 bottom plate, 2 placement plate, 3 hydraulic telescopic rod, 4 connecting block, 5 moving column, 6 vacuum pump, 7 annular pipe, 8 connecting pipe, 9 first L-shaped mounting frame, 10 rotating hollow plate, 11 vertical connecting pipe, 12 first rotating joint, 13 injection pipe, 14 rectangular block, 15 second L-shaped mounting frame, 16 piston cylinder, 17 motor, 18 semiconductor refrigeration component, 19 air inlet, 20 exhaust pipe, 21 first columnar groove, 22 rectangular strip, 23 rotating plate, 24 first piston plate, 25 second piston plate, 26 air inlet pipe, 27 connecting strip, 28 pressure gauge, 29 water inlet, 30 pressurized groove, 31 exhaust channel, 32 gas flow rate sensor, 33 serpentine pipe, 34 gas exhaust port, 35 vertical pipe, 36 rectangular hollow box, 37 rack, 38 second rotating joint, 39 gear, 40 rotating pipe, 41 electromagnet, 42 spring, 43 magnetic slide plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] Reference Figure 1-Figure 7A carbon dioxide cap layer stress and breakthrough experimental device comprises a bottom plate 1, a placing plate 2 is fixedly connected to the upper end of the bottom plate 1, two hydraulic telescopic rods 3 are symmetrically fixedly connected to the upper end of the bottom plate 1, and the subsequent upward and downward movement of the moving column 5 can be realized through the hydraulic telescopic rods 3. A moving column 5 is arranged above the placing plate 2, and the front and rear sides of the moving column 5 are fixedly connected to the connecting block 4, and the telescopic ends of the two hydraulic telescopic rods 3 are fixedly connected to the lower end of the connecting block 4. Six first columnar grooves 21 are opened at the upper end of the placing plate 2, and six pressurizing grooves 30 are opened at the lower end of the moving column 5, and each pressurizing groove 30 cooperates with its corresponding first columnar groove 21;

[0030] As an embodiment of the present invention, the inner top space of each pressurized tank 30 is connected to the outside through the water inlet 29, and a plurality of pressure gauges 28 are installed on the outer side wall of the moving column 5. The pressure gauge 28 here is an existing digital pressure gauge with a peak hold function. When this function is activated, the pressure gauge will record and display the highest pressure value measured since the last reset. Each pressure gauge 28 is used to detect the pressure in the corresponding pressurized tank 30, and a sealing valve is installed on each water inlet 29 to facilitate subsequent detection;

[0031] As an embodiment of the present invention, an annular tube 7 is provided on the outer side of the moving column 5, a vacuum pump 6 is installed on the side wall of the moving column 5, an air inlet end of the vacuum pump 6 is connected with the inside of the annular tube 7, the annular tube 7 is connected with the multiple pressurizing grooves 30 through multiple connecting tubes 8, each connecting tube 8 is installed with a solenoid valve, and the multiple solenoid valves are electrically connected to the vacuum pump 6;

[0032] As an embodiment of the present invention, it also includes a gas injection mechanism, which is located at the upper end of the base plate 1 and is used to inject carbon dioxide gas. The gas injection mechanism includes a rectangular block 14 fixedly connected to the upper end of the base plate 1, and a second columnar groove is provided at the upper end of the rectangular block 14. A second L-shaped mounting frame 15 is installed on the right side of the rectangular block 14, and a motor 17 is installed on the second L-shaped mounting frame 15. The output shaft of the motor 17 is fixedly connected to a rotating disk 23. A first piston plate 24 that can slide up and down is provided in the second columnar groove, and a rotating connecting strip 27 is rotated on the left side of the rotating disk 23. The other end of the connecting strip 27 is connected to the first piston plate The upper end of the second columnar groove is rotatably connected, the inner bottom of the second columnar groove is connected with an air inlet pipe 26, and the inner bottom of the second columnar groove is connected with an injection pipe 13. The injection pipe 13 is a soft pipe. Each injection pipe 13 and the air inlet pipe 26 are installed with a one-way valve. The other end of the injection pipe 13 is connected with an external carbon dioxide storage box. The internal air pressure of the carbon dioxide storage box selected here cannot exceed the carbon dioxide pressure required for the cover layer to break through. The one-way valve in the air inlet pipe 26 here flows in a one-way direction from the carbon dioxide storage box to the inner bottom of the second columnar groove, and the one-way valve in the injection pipe 13 flows in a one-way direction from the second columnar groove to the vertical connecting pipe 11;

[0033] As an embodiment of the present invention, it also includes a temperature regulating mechanism, which is used to change the temperature of carbon dioxide. The temperature regulating mechanism includes a first L-shaped mounting frame 9 fixedly connected to the upper end of the moving column 5, and a vertical connecting pipe 11 is provided through the horizontal portion of the first L-shaped mounting frame 9, and the vertical connecting pipe 11 is fixedly connected to the horizontal portion of the first L-shaped mounting frame 9. A rotating hollow disk 10 is provided above the moving column 5, and the rotating hollow disk 10 is filled with temperature conducting oil. A rectangular hollow box 36 is fixedly connected to the upper end of the moving column 5, and a rotating tube 40 is rotatably connected to the inner top of the rectangular hollow box 36. The upper end of the rotating tube 40 penetrates the inner top of the rectangular hollow box 36 and is fixedly connected to the lower end of the rotating hollow disk 10, and the upper end of the rotating tube 40 extends to the inside of the rectangular hollow box 36.

[0034] As an embodiment of the present invention, two rectangular bars 22 are symmetrically fixedly connected to the upper end of the rectangular block 14, and the upper ends of the two rectangular bars 22 are commonly fixedly connected to the piston cylinder 16. A second piston plate 25 that can slide up and down is arranged in the piston cylinder 16, and two fixing rods are symmetrically fixedly connected to the lower end of the second piston plate 25, and the lower ends of the two fixing rods are fixedly connected to the upper end of the first piston plate 24. The inner top space of the piston cylinder 16 is connected to the outside through the air inlet 19, and the inner top space of the piston cylinder 16 is connected to the exhaust pipe 20. The exhaust pipe 20 is a soft pipe. Check valves are installed inside the air inlet 19 and the exhaust pipe 20. The flow direction of the check valve in the air inlet 19 is from top to bottom, and the flow direction of the check valve in the exhaust pipe 20 is that the inner top space of the piston cylinder 16 enters the rotating tube 40 in one direction;

[0035] As an embodiment of the present invention, the other end of the exhaust pipe 20 extends to the inner bottom of the rectangular hollow box 36 and is connected to the lower end of the rotating tube 40 through the second rotating joint 38. Semiconductor refrigeration components 18 are installed on the inner walls of the left and right sides of the piston cylinder 16. The semiconductor refrigeration component 18 is composed of a semiconductor refrigeration sheet and a heat dissipation fan. This is the prior art. The cooling ends of the two semiconductor refrigeration components 18 extend to the inside of the piston cylinder 16. The other end of the injection pipe 13 is connected to the upper end of the vertical connecting pipe 11. A serpentine tube 33 is installed inside the rotating hollow disk 10. The serpentine tube 33 is a copper tube with good thermal conductivity. The air inlet end of the serpentine tube 33 passes through the inner top of the rotating hollow disk 10 and is connected to the lower end of the vertical connecting pipe 11 through the first rotating joint 12. The lower end of the serpentine tube 33 passes through the inner bottom of the rotating hollow disk 10. The inner top of each pressurizing groove 30 is connected to a vertical pipe 35. The upper ends of multiple vertical pipes 35 are in contact with the lower end of the rotating hollow disk 10 and are slidably connected.

[0036] The intermittent rotating mechanism also includes an intermittent rotating mechanism, which cooperates with the gas injection mechanism. The intermittent rotating mechanism includes a plurality of exhaust channels 31 respectively opened at the inner bottom of the first columnar groove 21, and a gas flow rate sensor 32 is installed at the inner bottom of each first columnar groove 21. A magnetic slide 43 that can slide left and right is arranged in the rectangular hollow box 36. An electromagnet 41 is fixedly connected to the right inner wall of the rectangular hollow box 36. The left side of the electromagnet 41 is electrically connected to the magnetic slide 43 through a spring 42. A rack 37 is fixedly connected to the left side of the magnetic slide 43. A gear is arranged on the outer side of the rotating tube 40. Wheel 39, gear 39 is meshed with rack 37, gear 39 is connected to rotating tube 40 through one-way bearing, multiple gas flow rate sensors 32 are matched with electromagnet 41, which is controlled by PLC. When gas flow rate sensor 32 senses airflow, it will trigger electromagnet 41 to be energized, and after airflow disappears, electromagnet 41 is de-energized. When electromagnet 41 is triggered for the second time, one of semiconductor refrigeration components 18 is turned on, and when electromagnet 41 is triggered for the fourth time, another semiconductor refrigeration component 18 is turned on, and when electromagnet 41 is triggered for the sixth time, both semiconductor refrigeration components 18 are de-energized.

[0037] In the present invention, the staff selects the cap layer to be inspected, such as a shale plate, cuts it into a circular plate shape, divides it into six parts, seals the upper ends of the six first columnar grooves 21, and then starts the multiple hydraulic telescopic rods 3 to contract, so that the multiple connecting blocks 4 move downward, and the movable column 5 moves downward until the lower end surface of the movable column 5 contacts the upper end surface of the cap layer, and then adds water to the first columnar grooves 21 at the right rear, left rear and front through the water inlet 29. At this time, the vacuum pump 6 can be used to evacuate the interior of the multiple pressurized grooves 30. In the initial state, the air outlet end of the serpentine tube 33 is connected to the vertical pipe 35 at the right front. The staff starts the motor 17. After the motor 17 is started, it will drive the rotating disk 23 to rotate. With the use of the connecting strip 27, it can drive the first piston plate 24 to reciprocate up and down. When the first piston plate 24 moves upward, carbon dioxide gas will be drawn in. When the first piston plate 24 moves downward, The gas is pressed into the injection pipe 13, enters the vertical connecting pipe 11, and then passes through the serpentine pipe 33 and is pressed into the right front pressurized groove 30. As the gas pressure continues to increase, it will eventually break through the cap layer. In this process, due to the gas pressurization, the collision frequency of gas molecules increases during the compression process, resulting in an increase in the average kinetic energy of the molecules, which is manifested macroscopically as an increase in temperature, resulting in an increase in the internal temperature, simulating the breakthrough of carbon dioxide in a high temperature and high pressure environment, and enters the first columnar groove 21 in the right front. The gas flow rate sensor 32 senses the airflow and controls the electromagnet 41 to be energized. After the gas in the right front pressurized groove 30 is completely released, the airflow sensed by the gas flow rate sensor 32 disappears, and the electromagnet 41 is controlled to be de-energized. Under the elastic action of the spring 42, the magnetic slide 43 and the rack 37 will move back. Due to the setting of the one-way bearing, the return movement will not allow the rotating tube 40 to rotate.

[0038] After the electromagnet 41 is energized, it will give a repulsive force to the magnetic slide 43, and the magnetic slide 43 will move left, driving the rack 37 to move left, so that the gear 39 and the one-way bearing will rotate the rotating tube 40, and the rotation of the rotating tube 40 will drive the rotating hollow disk 10 to rotate, and the rotation angle is 60°. At this time, the air outlet end of the serpentine tube 33 is connected to the right rear vertical tube 35, and the motor 17 is started again. In this state, the right rear pressure tank 30 is filled with water. Under the condition of high carbon dioxide, the water body is easy to dissolve carbon dioxide, making the water body acidic, thereby simulating the breakthrough of the carbon dioxide cap layer under high temperature, high pressure and high acid environment (because in reality, some groundwater will be acidified by carbon dioxide, which will affect the cap layer);

[0039] Repeating the above-mentioned actions will break through the carbon dioxide capping layer in the rear, left rear, left front and front pressurized tanks 30 in turn. When the electromagnet 41 is triggered for the second time, one of the semiconductor refrigeration components 18 is opened. When the electromagnet 41 is triggered for the fourth time, the other semiconductor refrigeration component 18 is opened. When the electromagnet 41 is triggered for the sixth time, both semiconductor refrigeration components 18 can be powered off. That is, when the rear and left rear pressurized tanks 30 are tested, one semiconductor refrigeration component 18 is opened. When the rear and left rear pressurized tanks 30 are tested, two semiconductor refrigeration components 18 are opened. The up and down movement of the first piston plate 24 will cause the second piston plate 25 to move up and down through the fixed rod. In conjunction with the air inlet 19, the exhaust pipe 20 and the internal one-way valve, low-temperature gas can be continuously injected into the rotating tube 40. , and finally enters the rotating hollow disk 10 to cool the temperature conducting oil, so that the detected carbon dioxide temperature can be reduced. When a semiconductor refrigeration component 18 is started, the temperature of the final compressed carbon dioxide can be made normal temperature by heat exchange, and when two semiconductor refrigeration components 18 are started, the temperature of the final compressed carbon dioxide can be made low temperature by heat exchange. In this way, the rear and left rear pressurizing grooves 30 respectively simulate the breakthrough of the carbon dioxide cap layer under normal temperature and high pressure environment and the breakthrough of the carbon dioxide cap layer under normal temperature and high pressure and high acid environment, while the left front and front pressurizing grooves 30 respectively simulate the breakthrough of the carbon dioxide cap layer under low temperature and high pressure environment and the breakthrough of the carbon dioxide cap layer under low temperature and high pressure and high acid environment. Finally, the staff can calculate the actual breakthrough stress through the maximum pressure recorded by the pressure gauge 28.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A carbon dioxide cap layer stress and breakthrough experimental device, characterized in that: include: A bottom plate (1), the upper end of the bottom plate (1) is fixedly connected to a placement plate (2), the upper end of the bottom plate (1) is symmetrically fixedly connected to two hydraulic telescopic rods (3), a movable column (5) is arranged above the placement plate (2), the front and rear sides of the movable column (5) are fixedly connected to a connecting block (4), the telescopic ends of the two hydraulic telescopic rods (3) are fixedly connected to the lower end of the connecting block (4), the upper end of the placement plate (2) is provided with six first columnar grooves (21), the lower end of the movable column (5) is provided with six pressurizing grooves (30), and each of the pressurizing grooves (30) cooperates with its corresponding first columnar groove (21); The inner top space of each of the pressurizing grooves (30) is connected to the outside through a water inlet (29); a plurality of pressure gauges (28) are installed on the outer side wall of the movable column (5); each of the pressure gauges (28) is used to detect the pressure in the corresponding pressurizing groove (30); and each of the water inlets (29) is installed with a sealing valve; A gas injection mechanism, the gas injection mechanism is located at the upper end of the bottom plate (1), the gas injection mechanism is used to inject carbon dioxide gas, the gas injection mechanism comprises a rectangular block (14) fixedly connected to the upper end of the bottom plate (1), the upper end of the rectangular block (14) is provided with a second columnar groove, a second L-shaped mounting frame (15) is installed on the right side of the rectangular block (14), a motor (17) is installed on the second L-shaped mounting frame (15), the output shaft of the motor (17) is fixedly connected to a rotating disk (23), a first piston plate (24) that can slide up and down is arranged in the second columnar groove, a left side of the rotating disk (23) is rotatably connected to the upper end of the first piston plate (24), the inner bottom of the second columnar groove is connected to an air intake pipe (26), the inner bottom of the second columnar groove is connected to an injection pipe (13), and each of the injection pipe (13) and the air intake pipe (26) is installed with a one-way valve; A temperature regulating mechanism, the temperature regulating mechanism is used to change the temperature of carbon dioxide, the temperature regulating mechanism comprises a first L-shaped mounting frame (9) fixedly connected to the upper end of a moving column (5), a vertical connecting pipe (11) is provided through the horizontal portion of the first L-shaped mounting frame (9), the vertical connecting pipe (11) is fixedly connected to the horizontal portion of the first L-shaped mounting frame (9), a rotating hollow disk (10) is provided above the moving column (5), the rotating hollow disk (10) is filled with temperature conducting oil, the upper end of the moving column (5) is fixedly connected to a rectangular hollow box (36), the inner top of the rectangular hollow box (36) is rotatably connected to a rotating pipe (40), the upper end of the rotating pipe (40) passes through the inner top of the rectangular hollow box (36) and is fixedly connected to the lower end of the rotating hollow disk (10), the upper end of the rotating pipe (40) extends into the interior of the rectangular hollow box (36), and the upper end of the rectangular block (14) is symmetrically fixedly connected to two rectangular bars ( 22), the upper ends of the two rectangular bars (22) are fixedly connected to a piston cylinder (16), a second piston plate (25) that can slide up and down is arranged in the piston cylinder (16), the lower end of the second piston plate (25) is symmetrically fixedly connected to two fixing rods, the lower ends of the two fixing rods are fixedly connected to the upper end of the first piston plate (24), the inner top space of the piston cylinder (16) is connected to the outside through the air inlet (19), the inner top space of the piston cylinder (16) is connected to the exhaust pipe (20), the air inlet (19) and the exhaust pipe (20) are both installed with a one-way valve, the other end of the exhaust pipe (20) extends to the bottom of the rectangular hollow box (36), and is connected to the lower end of the rotating tube (40) through a second rotating joint (38), semiconductor refrigeration components (18) are installed on the inner walls on both sides of the piston cylinder (16), and the cooling ends of the two semiconductor refrigeration components (18) extend into the piston cylinder (16); An intermittent rotating mechanism cooperates with the gas injection mechanism.

2. A carbon dioxide cap layer stress and breakthrough experimental device according to claim 1, characterized in that: An annular tube (7) is arranged on the outer side of the moving column (5), a vacuum pump (6) is installed on the side wall of the moving column (5), an air inlet end of the vacuum pump (6) is connected to the inside of the annular tube (7), and the annular tube (7) is connected to a plurality of pressurized grooves (30) through a plurality of connecting tubes (8).

3. A carbon dioxide cap layer stress and breakthrough experimental device according to claim 2, characterized in that: Each of the connecting pipes (8) is internally installed with a solenoid valve, and the plurality of solenoid valves are electrically connected to the vacuum pump (6).

4. A carbon dioxide cap layer stress and breakthrough experimental device according to claim 1, characterized in that: The other end of the injection pipe (13) is connected to the upper end of the vertical connecting pipe (11). A serpentine pipe (33) is installed inside the rotating hollow disk (10). The air inlet end of the serpentine pipe (33) passes through the inner top of the rotating hollow disk (10) and is connected to the lower end of the vertical connecting pipe (11) through a first rotating joint (12). The lower end of the serpentine pipe (33) passes through the inner bottom of the rotating hollow disk (10). The inner top of each of the pressurizing grooves (30) is connected to a vertical pipe (35). The upper ends of the plurality of vertical pipes (35) are in contact with the lower end of the rotating hollow disk (10) and are slidably connected.

5. A carbon dioxide cap layer stress and breakthrough experimental device according to claim 1, characterized in that: The intermittent rotation mechanism comprises a plurality of exhaust passages (31) respectively opened at the inner bottom of the first columnar groove (21); a gas flow rate sensor (32) is installed at the inner bottom of each of the first columnar grooves (21); a magnetic slide plate (43) which can slide left and right is arranged in the rectangular hollow box (36); an electromagnet (41) is fixedly connected to the right inner wall of the rectangular hollow box (36); the left side of the electromagnet (41) is electrically connected to the magnetic slide plate (43) via a spring (42); a rack (37) is fixedly connected to the left side of the magnetic slide plate (43); a gear (39) is arranged on the outer side of the rotating tube (40); the gear (39) is meshed with the rack (37); the gear (39) is connected to the rotating tube (40) via a one-way bearing; and the plurality of gas flow rate sensors (32) are matched with the electromagnet (41).

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