CO2 and rock reaction experiment device and use method

Abstract

This invention relates to the field of rock experimental technology, and discloses a CO2-rock reaction experimental apparatus and its method of use. The apparatus includes a supercritical CO2 storage and dispensing mechanism, a fracturing grouting mechanism, a thermal imaging mechanism, and a sample mold. A sample body is placed inside the sample mold, and the sample body has a central hole structure. Within the central hole structure is a CO2-rock reaction realization component, which includes a CO2-rock reaction fracturing and sealing mechanism and a CO2-rock reaction fracturing execution mechanism. Utilizing the convenience of fracturing grouting provided by shale borehole wall deterioration, this apparatus can perform borehole wall fracturing grouting to reinforce the borehole wall in shale areas. It employs a ring cavity reinforcement method, combined with the actual environment, to screen suitable grouting fluids and select appropriate grouting pressures while ensuring safety. Furthermore, subsequent experiments can be extended to combine CO2 utilization and solidification, further increasing geological sequestration.

Description

Technical Field

[0001] This invention relates to the field of rock experimental technology, specifically to an experimental apparatus and method for using CO2 to react with rocks. Background Technology

[0002] When performing CO2 geological sequestration, drilling is required to inject CO2 underground. Conventional drilling in shale formations is prone to wellbore instability after a period of time. However, using supercritical CO2 instead of water-based drilling fluid can easily lead to reduced shale stability. The uniaxial compressive strength, triaxial compressive strength, and tensile strength of shale after supercritical CO2 immersion decrease with increasing immersion time. Furthermore, when CO2 is adsorbed into the pores on the shale surface, the shale expands and deforms. Therefore, supercritical CO2, while utilizing CO2, offers better transport and thermodynamic properties. However, reactions can occur in shale formations, leading to wellbore instability. Summary of the Invention

[0003] The purpose of this invention is to provide an experimental apparatus and method for the reaction of CO2 with rocks, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An experimental apparatus for the reaction of CO2 with rocks includes a supercritical CO2 storage and delivery mechanism, a splitting grouting mechanism, a thermal imaging mechanism, and a sample mold. The thermal imaging mechanism is located on one side of the sample mold and collects internal thermal imaging images. A sample body is placed inside the sample mold. The sample body has a central hole structure in the middle, and a CO2-rock reaction realization component is located inside the central hole structure.

[0006] The CO2-rock reaction realization component includes a CO2 rock reaction splitting and sealing mechanism and a CO2 rock reaction splitting and actuating mechanism. The CO2 rock reaction splitting and sealing mechanism consists of several vertically distributed sealing plates, and the sealing plates divide the central hole structure into at least three sealed spaces. The number of CO2 rock reaction splitting and actuating mechanisms corresponds to the number of sealed spaces.

[0007] The CO2 rock reaction splitting actuator includes a grout release ring plate in the middle of the enclosed space and a sealing grout outlet flap vertically slidably connected to the upper and lower ends of the grout release ring plate. The grout release ring plate has a hollow structure inside and annularly distributed grout release holes are opened on the outer wall of the grout release ring plate.

[0008] The supercritical CO2 storage and delivery mechanism injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe. The supercritical CO2 enters the closed space directly and overflows through the gap between the grout release ring plate and the sealing plate. The overflowing supercritical CO2 contacts the central hole sidewall of the sample body.

[0009] The reinforcing grout in the splitting grouting mechanism is transported to the inside of the grout release ring plate through the grouting main pipe. Under pressure, the grout will lift the sealing grout outlet plate to the sealing layer plate to achieve sealing. The annular grout release hole is in an open state, and the pressurized grout acts on the inner wall of the central hole after being treated with supercritical CO2.

[0010] As a further embodiment of the present invention: the sample body is composed of three vertically distributed layered samples, and a mating groove is provided at the edge of the hole in two adjacent layered samples. A sealing layer protrusion rib ring that mates with the mating groove is fixedly connected to the outer wall of the sealing layer plate.

[0011] As a further embodiment of the present invention: the sample body is composed of an integral pressure sample, the side wall of the sealing plate is in contact with the inner wall of the hole of the integral pressure sample, the side wall of the sealing plate is attached with a sealing material, and a pressure device for applying pressure to the integral pressure sample is fixedly connected above the sample mold.

[0012] As a further embodiment of the present invention: two adjacent closed layers are fixedly connected by an integrated connecting rod, and the integrated connecting rod is fixedly connected to the inner wall of the grout release ring plate by a support rod.

[0013] As a further embodiment of the present invention: a plurality of support rods supporting the two cylinders are fixed inside the cavity of the grout release ring plate.

[0014] As a further embodiment of the present invention: each of the two adjacent sealing plates has a sealing slot on its opposite side that mates with the sealing slurry outlet plate.

[0015] As a further embodiment of the present invention: the end of the supercritical CO2 conveying pipe is fixedly connected to a discharge hole pipe corresponding to the closed space.

[0016] As a further embodiment of the present invention: the grouting main pipe passes through multiple of the sealed layers, and the grouting main pipe is connected to the grouting fluid release ring plate through a grouting valve branch pipe.

[0017] As a further embodiment of the present invention: the uppermost enclosed space is not equipped with the CO2 rock reaction splitting actuator;

[0018] As a further aspect of the present invention: a method of using an experimental apparatus for the reaction of CO2 with rocks, comprising:

[0019] A: The supercritical CO2 storage and delivery mechanism injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe. The supercritical CO2 overflows through the discharge hole pipe, passes through the gap between the grout release ring plate and the sealing plate, and enters the closed space to act on the inner wall of the central hole of the sample body for pressure and heat preservation for a period of time. The sealing valve is closed, and the splitting grouting mechanism injects grout into the cavity of the grout release ring plate through the grouting main pipe and the grouting branch pipe with valve. Affected by the liquid pressure, the sealing grout outlet plate is lifted to the sealing slot to form a sealed environment with the sealing plate. The annular grout release hole is exposed, and the grout flows into the annular cavity of the inner wall of the central hole after being treated by supercritical CO2 through the annular grout release hole, causing the inner wall of the central hole to split and the grout to enter.

[0020] A1: Three layered samples are vertically distributed. The uppermost layered sample contains only supercritical CO2 in its enclosed space, while the lower layered samples contain slurries of different pressures or types.

[0021] A2: The CO2-rock reaction realization component acts on the integrated pressure test specimen at the same time, and the pressure device applies pressure to the integrated pressure test specimen. The uppermost closed space contains only supercritical CO2, while the lower closed space is injected with slurry of different pressures or different types of slurry.

[0022] Furthermore, the use of this experimental device can lay the foundation for subsequent CO2 utilization and reinforcement experiments. On the one hand, it satisfies the CO2 sequestration and utilizes a small portion of the CO2, while on the other hand, it can ensure the stability of the underground CO2 sequestration pipeline. For example, special grouting fluid can be used to react with CO2 to produce calcium carbonate or other solid substances at the cracks, thereby completing CO2 sequestration and reinforcement.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This invention addresses the issue of borehole wall degradation caused by using supercritical CO2 instead of water-based drilling fluid in CO2 geological storage pipelines penetrating shale formations. Leveraging the convenience of fracturing grouting provided by the degraded shale borehole walls, this device can conduct borehole wall reinforcement experiments in shale zones using fracturing grouting. An annular cavity reinforcement method is employed, tailored to the specific environment, to screen suitable grouting fluids and select appropriate grouting pressures while ensuring safety. Furthermore, future experiments can be extended to incorporate CO2 utilization and solidification, further increasing the geological storage capacity. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a pressurized experiment using an experimental setup for the reaction of CO2 with rocks.

[0027] Figure 2 This is a schematic diagram of a non-pressure strength test of an experimental apparatus for the reaction of CO2 with rocks.

[0028] Figure 3 This is a schematic diagram demonstrating a non-pressurized experiment in an experimental setup for the reaction of CO2 with rocks.

[0029] Figure 4 This is a schematic diagram demonstrating a pressurized experiment in an experimental setup for the reaction of CO2 with rocks.

[0030] Figure 5 This is a three-dimensional schematic diagram of the CO2-rock reaction realization components in an experimental apparatus for the reaction of CO2 and rocks.

[0031] Figure 6 This is a three-dimensional cross-sectional schematic diagram of the CO2-rock reaction realization component in a CO2-rock reaction experimental apparatus;

[0032] In the diagram: 1. Supercritical CO2 storage and delivery mechanism; 11. Supercritical CO2 delivery pipe; 12. Discharge orifice pipe; 13. Sealing valve; 2. Fracturing grouting mechanism; 21. Grouting main pipe; 22. Grouting branch pipe with valve; 3. Thermal imaging mechanism; 4. Sample mold; 41A. Pressure application device; 5. Sample body; 5A. Integrated pressure sample; 5B. Layered sample; 51B. Matching groove; 6. CO2 rock reaction fracturing sealing mechanism; 61. Sealing plate; 611B. Sealing layer protrusion rib ring; 62. Sealing slot; 63. Integrated connecting rod; 7. CO2 rock reaction fracturing actuator; 71. Grouting fluid release ring plate; 72. Sealing grout outlet valve plate; 73. Annular grout release hole. Detailed Implementation

[0033] Please see Figures 1-6 :

[0034] Example 1:

[0035] In this embodiment, a supercritical CO2 storage and delivery mechanism 1, a splitting grouting mechanism 2, a thermal imaging mechanism 3, and a sample mold 4 are included. The thermal imaging mechanism 3 is located on one side of the sample mold 4 to collect internal thermal imaging images. A sample body 5 is placed inside the sample mold 4. The sample body 5 has a central hole structure in the middle, and a CO2-rock reaction realization component is located inside the central hole structure.

[0036] In this embodiment, the supercritical CO2 storage and dispensing mechanism 1 stores supercritical CO2 and applies it to the interior of the sample body 5, which is a shale sample with pores in the middle. The supercritical CO2 storage and dispensing mechanism 1 releases supercritical CO2 into the enclosed space, causing the supercritical CO2 to adsorb onto the inner wall of the pores in the shale sample, thus deteriorating the shale sample. Since the temperature of supercritical CO2 is 31 degrees Celsius, when it acts on the shale surface, it can transfer temperature, which assists in subsequent splitting grouting and reduces the problem of insufficient fluidity caused by a rapid temperature drop in the grout due to an excessive temperature difference between the grout and the rock. The shale treated with supercritical CO2 has reduced strength but insufficient stability. This shortcoming is addressed during splitting grouting, which improves the splitting effect and reinforces the area, thereby ensuring the stability of the underground CO2 storage pipeline.

[0037] In this embodiment, the CO2-rock reaction realization component includes a CO2 rock reaction splitting and sealing mechanism 6 and a CO2 rock reaction splitting and actuating mechanism 7. The CO2 rock reaction splitting and sealing mechanism 6 is composed of several vertically distributed sealing plates 61, and the sealing plates 61 divide the central hole structure into at least three sealed spaces. The CO2 rock reaction splitting and actuating mechanism 7 corresponds to the number of sealed spaces. The CO2 rock reaction splitting and actuating mechanism 7 includes a grouting fluid release ring plate 71 at the middle of the sealed space and a sealing grout outlet flap 72 vertically slidably connected to the upper and lower ends of the grouting fluid release ring plate 71. The interior of the grouting fluid release ring plate 71 is a hollow structure, and the outer wall of the grouting fluid release ring plate 71 has openings. There are annular grout release holes 73. The supercritical CO2 storage and delivery mechanism 1 injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe 11. The supercritical CO2 directly enters the closed space and overflows through the gap between the grout release ring plate 71 and the sealing plate 61. The overflowing supercritical CO2 contacts the side wall of the central hole of the sample body 5. The reinforcing grout in the splitting grouting mechanism 2 is transported to the inside of the grout release ring plate 71 through the grouting main pipe 21. Under pressure, the grout will lift the sealing grout outlet plate 72 to the sealing plate 61 to achieve sealing. The annular grout release holes 73 are in an open state. The pressurized grout acts on the inner wall of the central hole after being treated with supercritical CO2.

[0038] In this embodiment, the main purpose is to combine supercritical CO2 experiments and fracturing experiments. First, a central hole is formed in the sample body 5. The CO2 rock reaction fracturing sealing mechanism 6 includes several sealing plates 61; in this embodiment, three are described. The outer diameter of the sealing plates 61 matches the inner diameter of the central hole in the sample body 5, and a seal is achieved in conjunction with a sealing element. To ensure the accuracy of the experiment, a single rock sample is used for the combined experiment to reduce variables. The supercritical CO2 delivery pipe 11 passes through the discharge hole pipe 12 and enters multiple closed spaces through the closed layer plate 61. The supercritical CO2 released by the supercritical CO2 delivery pipe 11 enters the internal cylindrical cavity of the grouting fluid release ring plate 71 through the discharge hole pipe 12. At this time, the grout is not injected, and the sealing grout outlet flap 72 between the grouting fluid release ring plate 71 and the CO2 rock reaction splitting sealing mechanism 6 is not in use. The supercritical CO2 enters the annular reinforced cavity between the outer wall of the grouting fluid release ring plate 71 and the inner wall of the central hole of the sample body 5, and then is pressurized and heated to ensure that the supercritical CO2 fully acts on the shale surface.

[0039] In this embodiment, the purpose of designing the CO2 rock reaction splitting actuator 7 is to meet the needs of practical applications, such as how to reinforce the borehole wall of the shale layer while ensuring the unobstructed flow of the borehole after drilling through the shale layer.

[0040] In this embodiment, after the supercritical CO2 has fully acted on the shale, it is discharged. The discharge pipe 12 can have both discharge and recovery functions, or an external pumping and collection mechanism can be added. After pumping, the splitting grouting mechanism 2 delivers the reinforcing grout to the inside of the grouting release ring plate 71 through a pressure pump. The internal cavity of the grouting release ring plate 71 is connected. Under the influence of grout pressure, the sealing grout outlet flap 72 is lifted upwards and cooperates with the sealing layer plate 61 for sealing. During the sealing stage of the sealing grout outlet flap 72, the annular grout release hole 73 is in the open state. At this time, the grout enters the space between the outer wall of the grouting release ring plate 71 and the hole wall through the annular grout release hole 73. Under the influence of pressure, and because the shale surface treated with supercritical CO2 is more prone to generating new cracks, the grout, under the influence of pressure, drives the original cracks to expand, making the grout coverage area more extensive and increasing the reinforcement quality. After solidification, the borehole wall passing through the shale area is formed by the reinforcing member to form a new hole wall, preventing the supercritical CO2 from acting on the shale.

[0041] In this embodiment, two adjacent closed-layer plates 61 are fixedly connected by an integrated connecting rod 63, and the integrated connecting rod 63 is fixedly connected to the inner wall of the grout release ring plate 71 via a support rod. Several support rods supporting the two cylinders are fixed inside the cavity of the grout release ring plate 71. Since the cavity of the grout release ring plate 71 is annular and its upper and lower ends are open, the integrated connecting rod 63 is fixedly connected to the inner wall of the grout release ring plate 71 via a support rod, ensuring integrity. Because the grout release ring plate 71 is located in the middle and cannot be fixed directly, it is fixedly connected by the integrated connecting rod 63.

[0042] In this embodiment, two adjacent closed layers 61 are provided with sealing slots 62 on opposite sides to cooperate with the sealing slurry outlet flap 72. The sealing slots 62 cooperate with the sealing slurry outlet flap 72 to make the gap labyrinth, and the sealing performance is increased by cooperating with the sealing element.

[0043] In this embodiment, a discharge port pipe 12 corresponding to the enclosed space is fixedly connected to the end of the supercritical CO2 delivery pipe 11. The sealing valve 13 is mainly for the discharge of supercritical CO2.

[0044] In this embodiment, the grouting main pipe 21 passes through multiple closed layers 61, and the grouting main pipe 21 is connected to the grouting fluid release ring plate 71 through the grouting valve branch pipe 22. The main advantage is that during switching, the valves on the grouting valve branch pipe 22 can be closed or opened to allow grout of different pressures and types to enter different spaces.

[0045] In this embodiment, thermal imaging can be combined with slurry temperature to display the range and process of slurry movement.

[0046] Example 2

[0047] Based on Example 1, this embodiment consists of three vertically distributed layered samples 5B. The edges of the holes in two adjacent layered samples 5B are provided with mating grooves 51B. The outer wall of the closed layer plate 61 is fixedly connected with a sealing layer protrusion rib ring 611B that mates with the mating groove 51B. The uppermost closed space is not provided with a CO2 rock reaction splitting actuator 7.

[0048] This embodiment mainly verifies the strength comparison of shale. After the layered sample 5B is vertically distributed, it forms a seal with the sealing layer protrusion ring 611B through the matching groove 51B. The uppermost closed space is only affected by supercritical CO2, while the lower part can be filled with different pressures or different grouts. The main purpose is to verify the strength comparison of the sample after grouting.

[0049] Example 3

[0050] Based on Example 1, in this embodiment, the sample body 5 is composed of an integral pressure sample 5A. The side wall of the sealing plate 61 is in contact with the inner wall of the hole in the integral pressure sample 5A. The side wall of the sealing plate 61 is attached with sealing material. A pressure device 41A for applying pressure to the integral pressure sample 5A is fixedly connected above the sample mold 4. The uppermost closed space is not equipped with a CO2 rock reaction splitting actuator 7.

[0051] In this embodiment, the pressure application device 41A is used to simulate the actual environment of shale. Since in the early stage of splitting, when the grout is not solidified, it is easy to cause safety problems such as deformation or collapse due to the reduction in strength. Therefore, it is necessary to use the pressure application device 41A to simulate and determine the strength of shale after supercritical CO2 treatment, the degree of splitting caused by different grout solidification times and different pressures, and obtain the optimal grouting pressure and grout type to meet the actual environmental application requirements.

[0052] Usage process:

[0053] A: The supercritical CO2 storage and delivery mechanism 1 injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe 11. The supercritical CO2 overflows through the discharge hole pipe 12, passes through the gap between the grout release ring plate 71 and the sealing plate 61, and enters the closed space to act on the inner wall of the central hole of the sample body 5 for a period of time to maintain pressure and heat. The sealing valve 13 is closed, and the splitting grouting mechanism 2 injects grout into the cavity of the grout release ring plate 71 through the grouting main pipe 21 and the grouting branch pipe with valve 22. Affected by the liquid pressure, the sealing grout outlet plate 72 is lifted to the sealing slot 62 to form a sealed environment with the sealing plate 61. The annular grout release hole 73 is exposed, and the grout flows into the annular cavity of the inner wall of the central hole after being treated by supercritical CO2 through the annular grout release hole 73, causing the inner wall of the central hole to split and the grout to enter.

[0054] A1: Three layered samples 5B are vertically distributed. The uppermost layered sample 5B has only supercritical CO2 in its enclosed space, while the lower layered sample 5B has different pressures or different types of slurry injected into its enclosed space.

[0055] A2: The CO2-rock reaction realization component acts on the integrated pressure test specimen 5A, while the pressure device 41A applies pressure to the integrated pressure test specimen 5A. The uppermost closed space contains only supercritical CO2, while the lower closed space is injected with slurry of different pressures or different types of slurry.

[0056] Furthermore, this experimental setup can serve as a foundation for subsequent CO2 utilization and reinforcement experiments. On the one hand, it satisfies the CO2 sequestration requirement, allowing for the utilization of a small portion of the CO2. On the other hand, it can ensure the stability of underground CO2 sequestration pipelines. For example, special grouting fluid can be used to react with CO2 to produce calcium carbonate or other solid substances at the cracks, thus completing CO2 sequestration and reinforcement.

[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An experimental apparatus for the reaction of CO2 with rocks, comprising a supercritical CO2 storage and dispensing mechanism (1), a splitting grouting mechanism (2), a thermal imaging mechanism (3), and a sample mold (4), wherein the thermal imaging mechanism (3) is located on one side of the sample mold (4) to acquire internal thermal imaging images, characterized in that: The sample mold (4) contains a sample body (5), the sample body (5) has a central hole structure in the middle, and the central hole structure contains a CO2-rock reaction realization component. The CO2-rock reaction realization component includes a CO2 rock reaction splitting and sealing mechanism (6) and a CO2 rock reaction splitting and actuating mechanism (7). The CO2 rock reaction splitting and sealing mechanism (6) is composed of several vertically distributed sealing plates (61), and the sealing plates (61) divide the central hole structure into at least three sealed spaces. The CO2 rock reaction splitting and actuating mechanism (7) corresponds to the number of sealed spaces. The CO2 rock reaction splitting actuator (7) includes a grout release ring plate (71) in the middle of the enclosed space and a sealing grout outlet valve plate (72) that is vertically slidably connected to the upper and lower ends of the grout release ring plate (71). The grout release ring plate (71) has a hollow structure inside and annular grout release holes (73) are provided on the outer wall of the grout release ring plate (71). The supercritical CO2 storage and delivery mechanism (1) injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe (11). The supercritical CO2 directly enters the closed space and overflows through the gap between the grout release ring plate (71) and the closed layer plate (61). The overflowing supercritical CO2 contacts the central hole sidewall of the sample body (5). The reinforcing grout in the splitting grouting mechanism (2) is transported to the inside of the grouting release ring plate (71) through the grouting main pipe (21). Under pressure, the grout will lift the sealing grout outlet plate (72) to the sealing layer plate (61) to achieve sealing. The annular grout release hole (73) is in an open state, and the pressurized grout acts on the inner wall of the central hole after supercritical CO2 treatment.

2. The experimental apparatus for the reaction of CO2 with rocks according to claim 1, characterized in that: The sample body (5) consists of three vertically distributed layered samples (5B). The edges of the holes in two adjacent layered samples (5B) are provided with mating grooves (51B). The outer wall of the sealing plate (61) is fixedly connected with a sealing protrusion rib ring (611B) that mates with the mating groove (51B).

3. The experimental apparatus for the reaction of CO2 with rocks according to claim 2, characterized in that: The sample body (5) is composed of an integral pressure sample (5A). The side wall of the sealing plate (61) is in contact with the inner wall of the hole in the integral pressure sample (5A). The side wall of the sealing plate (61) is covered with sealing material. A pressure device (41A) for applying pressure to the integral pressure sample (5A) is fixedly connected above the sample mold (4).

4. The experimental apparatus for the reaction of CO2 with rocks according to claim 3, characterized in that: The two adjacent closed layers (61) are fixedly connected by an integrated connecting rod (63), and the integrated connecting rod (63) is fixedly connected to the inner wall of the grout release ring plate (71) by a support rod.

5. The experimental apparatus for the reaction of CO2 with rocks according to claim 4, characterized in that: Each of the two adjacent sealing plates (61) has a sealing slot (62) on its opposite side that mates with the sealing slurry outlet plate (72).

6. The experimental apparatus for the reaction of CO2 with rocks according to claim 5, characterized in that: The end of the supercritical CO2 delivery pipe (11) is fixedly connected to a discharge port pipe (12) corresponding to the enclosed space.

7. The experimental apparatus for the reaction of CO2 with rocks according to claim 6, characterized in that: The grouting main pipe (21) passes through multiple of the closed layers (61), and the grouting main pipe (21) is connected to the grouting fluid release ring plate (71) through the grouting valve branch pipe (22).

8. The experimental apparatus for the reaction of CO2 with rocks according to claim 7, characterized in that: The uppermost enclosed space is not equipped with the CO2 rock reaction splitting actuator (7).

9. The method of using the experimental apparatus for the reaction of CO2 with rocks according to claim 8, characterized in that: include: A: The supercritical CO2 storage and delivery mechanism (1) injects supercritical CO2 into the closed space through the supercritical CO2 delivery pipe (11). The supercritical CO2 overflows through the discharge hole pipe (12), passes through the gap between the grout release ring plate (71) and the sealing plate (61), and enters the closed space to act on the inner wall of the central hole of the sample body (5) for a period of time to maintain pressure and heat. The sealing valve (13) is closed. The splitting grouting mechanism (2) injects the grout into the cavity of the grout release ring plate (71) through the grouting main pipe (21) and the grouting branch pipe with valve (22). Affected by the liquid pressure, the sealing grout release plate (72) is lifted to the sealing slot (62) to form a sealed environment with the sealing plate (61). The annular grout release hole (73) is exposed. The grout flows into the annular cavity of the inner wall of the central hole after being treated by supercritical CO2 through the annular grout release hole (73), causing the inner wall of the central hole to split and the grout to enter. A1: Three layered samples (5B) are vertically distributed. The uppermost layered sample (5B) contains only supercritical CO2 in its enclosed space, while the lower layered sample (5B) is filled with slurry of different pressures or types. A2: While the CO2-rock reaction realization component acts on the integrated pressure test specimen (5A), the pressure device (41A) applies pressure to the integrated pressure test specimen (5A). The uppermost closed space contains only supercritical CO2, while the lower closed space is injected with slurry of different pressures or different types of slurry.

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