Carbon dioxide sequestration simulation experiment device and method
By using target underground stratum cores and a carbon dioxide sequestration simulation experimental device with multiple injection ports, the problem of parameter assumption bias was solved, high-precision mineralization efficiency assessment was achieved, and reliable sequestration data support was provided.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- YANGTZE UNIVERSITY
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-26
AI Technical Summary
In existing carbon dioxide sequestration simulation experiments, the parameter assumptions deviate significantly from the real environment, resulting in poor reliability of experimental data and an inability to accurately assess sequestration efficiency and safety.
The test device uses rock cores from the target underground strata as experimental equipment, and sets up multiple injection ports and monitoring units. The carbonic acid solution is heated by the heating unit and injected into the rock core. The reaction data is monitored in real time by the monitoring unit to realize the detection of mineralization efficiency at different temperatures and distances.
It improves the accuracy and precision of experimental data, enabling it to truly reflect the stratigraphic environment, accurately capture spatial gradient differences, and provide reliable evidence of preservation.
Smart Images
Figure CN122084870A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of carbon dioxide sequestration technology, and specifically to a carbon dioxide sequestration simulation experimental apparatus and method. Background Technology
[0002] Carbon dioxide sequestration is an emission reduction technology that uses engineering techniques to store carbon dioxide in geological structures for a long period of time. Before implementing carbon dioxide sequestration technology, simulation experiments are needed to reveal the migration patterns of carbon dioxide in underground reservoirs, and then assess the efficiency and safety of sequestration.
[0003] Currently, existing carbon dioxide sequestration simulation experiments both domestically and internationally primarily involve numerical simulations and the use of small core samples. For example, the world's first project using free-phase supercritical liquid carbon dioxide for in-situ mineralization sequestration in overflow-type basalt involved periodically collecting downhole fluid samples for analysis during a two-year monitoring period following carbon dioxide injection. Results showed the discovery of significant carbonate nodules within the core vesicles, and the feasibility of the mineralization reaction was verified using small core samples in the early stages. These existing technologies simulate the underground transport path and mineralization process of carbon dioxide by collecting geological parameters of the target area and constructing mathematical models based on thermodynamics, fluid mechanics, and chemical reaction kinetics, ultimately calculating the theoretical mineralization efficiency. However, underground basalt strata are highly heterogeneous, and parameters in unexplored areas need to be supplemented through interpolation or assumptions. This leads to significant deviations between the assumed parameters and the actual environment, and also ignores the geometric morphology and distribution characteristics of micropores. Idealized assumptions about the connecting medium cannot recreate these processes, ultimately resulting in poor reliability of the experimental data. Summary of the Invention
[0004] To address the shortcomings of the existing technologies, this invention proposes a carbon dioxide sequestration simulation experimental device and method. Rock cores are directly collected from the target underground strata, which can solve the technical problem that the existing parameter assumptions deviate significantly from the real environment, resulting in poor reliability of experimental data.
[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a carbon dioxide sequestration simulation experimental apparatus, comprising: The mixture preparation unit is used to dissolve carbon dioxide gas in water to generate a carbonic acid solution; A heating unit, the inlet of which is connected to the outlet of the mixture preparation unit, is used to heat the generated carbonic acid solution; The simulation unit is used to introduce a heated carbonic acid solution into a target rock core, which has multiple injection ports along its axial direction, and the multiple injection ports are respectively connected to the outlet of the heating unit; The monitoring unit is connected to the mixture preparation unit, the heating unit and the simulation unit respectively, and is used to monitor various data generated by the reaction of the carbonic acid solution in the target rock core.
[0006] In some embodiments, the simulation unit includes a first test component and a second test component, the inlets of the first test component and the second test component are respectively connected to the outlet of the heating unit, and the first test component and the second test component are respectively connected to the monitoring unit for signal connection; The first test component and the second test component are used to introduce a carbonic acid solution into the same or different target rock cores.
[0007] In some embodiments, the first test assembly includes a clamp, a ring presser, and a test pipeline. The clamp is used to mount the target rock core. The ring presser is disposed outside the target rock core and is used to apply radial pressure to the target rock core. The test pipeline connects to a plurality of the injection ports and outlets of the target rock core, and the test pipeline is connected to the outlet of the heating unit.
[0008] In some embodiments, the first test component further includes a collector connected to the end outlet of the test pipeline for collecting the reaction products of the carbonic acid solution and the target rock core.
[0009] In some embodiments, the first test component further includes a first valve and a pressure gauge, both of which are disposed on the test pipeline and located at the inlet front end and outlet rear end of the target rock core, respectively, and the first valve and pressure gauge are respectively connected to the monitoring unit for signal transmission.
[0010] In some embodiments, the structure of the second test component is the same as that of the first test component.
[0011] In some embodiments, the simulation unit further includes an annular passage, the inlet of which is connected to the outlet of the heating unit, and the two outlets of which are respectively connected to the inlet of the second test component of the first test component; A second valve is also provided on the ring path, and the second valve is connected to the monitoring unit for signal transmission.
[0012] In some embodiments, the mixture preparation unit includes a carbon dioxide cylinder, a water tank, a mixer, and a mixing pipeline. The outlets of the carbon dioxide cylinder and the water tank are respectively connected to the inlet of the mixer. The outlet of the mixer is connected to the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the heating unit.
[0013] In some embodiments, a gas venting unit is further included, which is connected in sequence to the mixture preparation unit, the heating unit and the simulation unit, for venting gas from the device.
[0014] Secondly, the present invention also proposes a carbon dioxide sequestration simulation experiment method, which is implemented by the carbon dioxide sequestration simulation experiment device provided in the first aspect of the present invention, and includes the following steps: The target rock core is clamped in the simulation unit, and multiple injection ports located along the axial direction of the target rock core are connected to the outlet of the heating unit. Carbonic acid solution is prepared using a mixture preparation unit; The prepared carbonate solution is heated to the set temperature using a heating unit. The heated carbonic acid solution is injected into the target rock core through different injection ports as needed; The monitoring unit monitors various data generated by the reaction of carbonated solutions injected from different injection ports with the target rock core.
[0015] Compared with the prior art, the beneficial effects of the present invention mainly include: This invention provides a carbon dioxide sequestration simulation experimental device and method that directly uses rock cores from the target underground strata as the target rock cores. The porosity, permeability, and mineral composition of these cores are completely consistent with the original strata, thus accurately reflecting the real environment of the target area and greatly improving the accuracy of the experimental data. Furthermore, the target rock cores are equipped with multiple injection ports along the axial direction. Carbonic acid solution heated to the target temperature by a heating unit is injected into the target rock cores through these ports, enabling continuous capture of carbon dioxide carbonization data at different monitoring points at different temperatures. This accurately reflects the differences in spatial gradients. Therefore, this invention also greatly improves the accuracy of experimental testing, providing strong and reliable evidence for carbon dioxide sequestration. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is an overall schematic diagram of the experimental apparatus described in this invention; Figure 2 This is an overall flowchart of the experimental method described in this invention.
[0017] As shown in the figure: 100. Mixture preparation unit; 110. Carbon dioxide cylinder; 120. Water tank; 130. Mixer; 140. Mixing pipeline; 150. Vacuum pump; 160. Flow meter. 200, heating unit; 210, heater; 220, heating pipe; 300, Simulation unit; 310, First test assembly; 311, Clamp; 312, Ring clamp; 313, Test line; 314, Collector; 315, First valve; 316, Pressure gauge; 320, Second test assembly; 330, Annular passage; 331, Second valve. 400. Gas venting unit. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0019] Currently, a series of carbon dioxide sequestration projects have been carried out both domestically and internationally, resulting in a technology that combines experimental testing with numerical simulation. For example: 1. The Wallula Project in the United States: The Wallula Project is the world's first project to use free-phase supercritical liquid carbon dioxide for in-situ mineralization and sequestration in overflow-type basalt. During the two-year monitoring period after injection, downhole fluid samples were collected regularly for analysis. The results showed that obvious carbonate nodules were found in the vesicles of the core. The feasibility of the mineralization reaction was verified in the early stage based on small core samples.
[0020] 2. Iceland Carbfix Project: Established in 2007, the Carbfix project aims to develop a method for underground carbon dioxide mineralization. The project conducts multi-temperature and multi-pressure experiments using a large number of core samples to obtain basic reaction parameters and, combined with numerical simulation tools, predicts the regional mineralization distribution after large-scale injection, providing key evidence for engineering scale-up.
[0021] 3. Japan's AIST Project: This project primarily investigates the influence of the interaction between carbon dioxide, water, and basalt on basalt permeability at 200°C and analyzes the differences in pore structure modification caused by the reaction under different pressure differentials. This study shows that when a mixture rich in carbon dioxide and water is injected at 200°C, the main product of the basalt reaction is montmorillonite-like layered silicates. Using numerical simulation software, a fluid-rock mechanics coupled model was constructed to quantify the impact of pore structure changes on reservoir stability.
[0022] 4. Shenhua CCS Project: my country's first full-process demonstration project for carbon dioxide sequestration to underground saline aquifers has been put into operation for more than a year. It has accumulated more than 40,000 tons of carbon dioxide, achieving a breakthrough in the field of carbon capture and storage (CCS) technology. Furthermore, a series of studies on CO2-water-rock reactions in sandstone reservoirs have been carried out around this project.
[0023] The aforementioned techniques for assessing the carbon dioxide mineralization and sequestration efficiency of basaltic formations are mainly divided into two categories: numerical simulation and small core samples. However, both have significant drawbacks: 1. Limitations of Numerical Simulation Evaluation Method: The numerical simulation evaluation method collects geological parameters of the target area and constructs a mathematical model based on the principles of thermodynamics, fluid mechanics, and chemical reaction kinetics to simulate the migration path of carbon dioxide underground and the mineralization reaction process, ultimately calculating the theoretical mineralization efficiency. However, underground basalt strata are highly heterogeneous, and parameters in unexplored areas need to be supplemented through interpolation or assumptions, leading to significant deviations between the assumed parameters and the actual environment. Furthermore, it neglects the geometric morphology and distribution characteristics of micropores, and the idealized continuous medium assumption cannot reproduce these processes.
[0024] 2. Small core sample test method: The core length is insufficient to simulate long-distance migration process. In actual process, the migration distance of carbon dioxide from the injection port to the surrounding strata can reach 10-50 meters. During the migration process, the concentration will decrease due to factors such as diffusion, adsorption, and preliminary reaction. The mineralization reaction rate will also slow down as the concentration decreases. However, small cores (about 200 mm in length) can only cover the high concentration area near the injection port and cannot reproduce the entire process of "concentration decay - reaction deceleration". The small volume of the core sample is easily affected by individual differences such as uneven local mineral composition and micro-fracture development. In actual engineering, the core volume of the sealed area is large, and the impact of individual differences on the overall efficiency is small. Therefore, the test results of small samples cannot represent the actual situation of the project. Therefore, this experimental method needs to address the shortcomings of numerical simulation in terms of the lack of authenticity and verifiability in the evaluation of mineralization efficiency; the influence of local mineral composition on small core sample experiments, the neglect of the effect of CO2 multi-directional migration on mineralization reactions at different distances, and the inability to simulate long-distance migration; the lack of multi-temperature gradient synchronous experimental design, the failure to study the mineralization differences at different injection port distances in ultra-long basalt cores, and the inability to accurately capture the characteristics of vertical mineralization gradient.
[0025] 3. Past studies on CO2 sequestration in depleted oil and gas reservoirs in China have mainly focused on estimating physical sequestration, neglecting CO2 mineralization sequestration. Most experiments failed to conduct real-time monitoring of carbon dioxide inside the core, making it difficult to accurately capture details. Furthermore, only one set of core samples could be used for the experiments, resulting in relatively low experimental efficiency.
[0026] To address the shortcomings of the existing technologies mentioned above, such as Figure 1As shown, a first aspect of the present invention provides a carbon dioxide sequestration simulation experimental apparatus, comprising a mixture preparation unit 100, a heating unit 200, a simulation unit 300, and a monitoring unit (not shown in the figure). The mixture preparation unit 100 is used to dissolve carbon dioxide gas in water to form a carbonic acid solution. The inlet of the heating unit 200 is connected to the outlet of the mixture preparation unit 100 for heating the generated carbonic acid solution. The simulation unit 300 is used to introduce the heated carbonic acid solution into a target rock core. The target rock core has multiple injection ports arranged along its circumference, and the multiple injection ports are respectively connected to the outlet of the heating unit 200. The monitoring unit is connected to the mixture preparation unit 100, the heating unit 200, and the simulation unit 300 for signal monitoring of various data generated by the reaction of the carbonic acid solution in the target rock core.
[0027] The carbon dioxide sequestration simulation experimental device provided by this invention directly uses the rock core of the target underground stratum as the target rock core. Its porosity, permeability and mineral composition are completely consistent with the original stratum, so it can truly reflect the real environment of the stratum in the target area and greatly improve the accuracy of experimental data. Moreover, the target rock core is provided with multiple injection ports in the axial direction. Carbonic acid solution heated to the target temperature by the heating unit 200 is sent into the target rock core through multiple injection ports, realizing the continuous capture of carbon dioxide carbonization data at different monitoring points at different temperatures, accurately reflecting the differences in spatial gradient. Therefore, this invention also greatly improves the accuracy of experimental testing and provides strong and reliable evidence support for carbon dioxide sequestration.
[0028] It should be noted that the target rock core used in this invention is no less than 50cm in length, and usually has 3-5 injection ports, which are monitoring points, set along its axis, corresponding to different distances, to realize the spatial gradient detection of carbon dioxide mineralization efficiency. This ultra-long rock core can effectively reduce the influence of micro-individual differences on the overall results, and after pretreatment, its porosity, permeability, and mineral composition are completely consistent with the original strata, avoiding the deviation of parameter assumptions, and can more realistically reproduce the carbonization reaction, thus improving the accuracy of experimental data.
[0029] In addition, the present invention can heat the mixture to the target temperature, such as 25°C, 80°C, 150°C and 200°C, through the heating unit 200, thereby realizing different reactions between the mixture and the target rock core at different temperatures; and through the monitoring unit, monitoring is implemented, and data is collected simultaneously through CT scanning, fluid component analysis and other technologies, which can accurately quantify the mineralization efficiency.
[0030] In specific implementations of this invention, such as Figure 1As shown, the mixture preparation unit 100 includes a carbon dioxide cylinder 110, a water tank 120, a mixer 130, and a mixing pipeline 140. The outlets of the carbon dioxide cylinder 110 and the water tank 120 are respectively connected to the inlet of the mixer 130. The outlet of the mixer 130 is connected to the mixing pipeline 140, and the outlet of the mixing pipeline 140 is connected to the inlet of the heating unit 200.
[0031] Carbon dioxide gas is pumped from the carbon dioxide cylinder 110 to the mixer 130 by an air pump, and water from the water tank 120 is pumped to the mixer 130 by a water pump. The two are thoroughly mixed in the mixer 130 to form a carbonic acid solution. The carbonic acid solution is sent to the heating unit 200 through the mixing pipeline 140 under the action of the vacuum pump 150. During this process, a flow meter 160 is set to control the metering of carbon dioxide gas and carbonic acid solution.
[0032] In a specific implementation of the present invention, the heating unit 200 includes a heater 210 and a heating pipe 220. The inlet of the heater 210 is connected to the outlet of the mixing pipe 140, the outlet of the heater 210 is connected to the inlet of the heating pipe 220, and the outlet of the heating pipe 220 is connected to the simulation unit 300. The carbonic acid solution flowing out of the mixer 130 enters the heater 210 for heating to various target temperatures, and then is sent to the simulation unit 300 through the heating pipe 220.
[0033] Furthermore, in a specific implementation of the present invention, the simulation unit 300 includes a first test component 310 and a second test component 320. The inlets of the first test component 310 and the second test component 320 are respectively connected to the outlet of the heating unit 200, specifically to the outlet of the heating pipe 220, and the first test component 310 and the second test component 320 are respectively connected to the monitoring unit signal.
[0034] In other words, this invention achieves simultaneous comparison of two variables—injection distance and mineralization temperature—by setting two sets of target rock cores in parallel. This method is more efficient than traditional single-set experiments and can quickly obtain multi-dimensional mineralization patterns.
[0035] Furthermore, the first test assembly 310 includes a clamp 311, a ring presser 312, and a test pipeline 313. The clamp 311 is used to install the target rock core. The ring presser 312 is disposed outside the target rock core and is used to apply radial pressure to the target rock core. The test pipeline 313 connects to multiple injection ports and outlets of the target rock core, and the test pipeline 313 is connected to the outlet of the heating unit 200, specifically to the outlet of the heating pipeline 220.
[0036] Furthermore, the first test component 310 also includes a collector 314, which is connected to the end outlet of the test pipeline 313 and is used to collect the reaction products of the carbonic acid solution and the target rock core.
[0037] Furthermore, the first test component 310 also includes a first valve 315 and a pressure gauge 316. The first valve 315 and the pressure gauge 316 are both installed on the test pipeline 313 and located at the inlet front end and outlet rear end of the target rock core. The first valve 315 and the pressure gauge 316 are respectively connected to the monitoring unit for signal transmission.
[0038] It should be noted that in this invention, the structure of the second test component 320 is the same as that of the first test component 310. The two grippers 311 in the first test component 310 and the second test component 320 can grip the same or different target rock cores. When any one of the grippers 311 in the first test component 310 or the second test component 320 grips a target rock core, or when the two grippers 311 grip two target rock cores with different compositions, the experimental device provided by this invention can monitor the changes of the target rock cores during the reaction process under different temperatures and different distance gradients, thereby improving experimental efficiency and accuracy. When the two grippers 311 of the first test component 310 and the second test component 320 grip two target rock cores with the same composition, we designed a ring passage 330 to study the impact on the sealing process during bidirectional transport.
[0039] Specifically, the simulation unit 300 further includes an annular passage 330, the inlet of which is connected to the outlet of the heating unit 200, specifically to the heating pipe 220. The two outlets of the annular passage 330 are respectively connected to the inlet of the second test component 320 of the first test component 310, specifically to the test pipe 313 in the first test component 310 and the second test component 320, respectively.
[0040] Specifically, a second valve 331 is also provided on the annular passage 330, and the second valve 331 is connected to the monitoring unit for signal transmission.
[0041] This invention utilizes a ring-shaped passage 330 for bidirectional carbon dioxide transport, which differs from the current unidirectional transport of carbon dioxide through the target core. Bidirectional transport of carbon dioxide in the core can more intuitively simulate the reaction in actual formations, better reflect the dynamics of actual formation fluids, and reveal the influence mechanism of multidirectional transport on mineralization at different distances. The experimental results obtained can provide powerful data for engineering projects. Furthermore, the experimental device provided by this invention, through the control of the aforementioned ring-shaped pipe 330 and various valves, realizes multiple modes of single-core single-variable testing, dual-core multi-variable synchronous testing, and multi-path cyclic testing, improving the flexibility and efficiency of the experiment.
[0042] Furthermore, the experimental apparatus provided by the present invention also includes a gas venting unit 400, which is connected in sequence to the mixture preparation unit 100, the heating unit 200 and the simulation unit 300, for venting the gas in the apparatus.
[0043] Furthermore, the gas venting unit 400 is a nitrogen cylinder.
[0044] like Figure 2 As shown, a second aspect of the present invention also provides a carbon dioxide sequestration simulation experiment method, implemented using the experimental apparatus provided in the first aspect of the present invention. The experimental method includes the following steps: Step S1: The target rock core is clamped in the simulation unit 300, specifically clamped on the clamp 311, and the multiple liquid injection ports set in the axial direction of the target rock core are respectively connected to the outlet of the heating unit 200, specifically connected to the heating pipe 220. Step S2: Open the valve of the gas venting unit 400 to fill the entire experimental apparatus with nitrogen gas, then close the nitrogen gas valve and use the vacuum pump 150 to remove the nitrogen gas from the entire apparatus. Step S3: Prepare a carbonic acid solution through the mixture preparation unit 100. Specifically, open the valves of the carbon dioxide cylinder 110 and the water tank 120 to send a certain amount of carbon dioxide gas and water into the mixer 130 to generate a carbonic acid solution. Step S4: The prepared carbonic acid solution is heated to a set temperature by the heating unit 200, specifically by heating the mixture by the heater 210. Step S5: The heated carbonic acid solution is injected into the target rock core through different injection ports as needed; Step S6 involves monitoring various data generated by the reaction of carbonated solutions injected from different injection ports with the target rock core through a monitoring unit.
[0045] In the above process, if any one of the clamps 311 in the first test component 310 or the second test component 320 clamps the target rock core, or if the two clamps 311 clamp two target rock cores with different compositions, the annular passage 330 needs to be closed. At this time, the carbonization reaction of a single target rock core or two independent target rock cores with the same composition is being tested. The experimental device provided by this invention can monitor the changes of the target rock core during the reaction process under different temperatures and different distance gradients, which improves the experimental efficiency and accuracy. When the two clamps 311 of the first test component 310 and the second test component 320 clamp two target rock cores with the same composition, the annular passage 330 needs to be opened. At this time, the influence on the sealing process during bidirectional transport is studied through the annular passage 330.
[0046] In summary, the carbon dioxide sequestration simulation experimental method provided by this invention uses rock cores from underground strata in the target area, which can realistically reflect the carbonization process and improve the accuracy of experimental data. The design of the annular pathway enables bidirectional transport of carbon dioxide, which can better reflect the fluid dynamics of actual strata and reveal the influence mechanism of multidirectional transport on mineralization at different distances. At the same time, the experimental method of this invention enables simultaneous comparison of two variables, injection distance and mineralization temperature, which improves experimental data and provides reliable data support for carbon dioxide sequestration technology.
[0047] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A carbon dioxide sequestration simulation experimental apparatus, characterized in that, include: The mixture preparation unit is used to dissolve carbon dioxide gas in water to generate a carbonic acid solution; A heating unit, the inlet of which is connected to the outlet of the mixture preparation unit, is used to heat the generated carbonic acid solution; The simulation unit is used to introduce a heated carbonic acid solution into a target rock core, which has multiple injection ports along its axial direction, and the multiple injection ports are respectively connected to the outlet of the heating unit; The monitoring unit is connected to the mixture preparation unit, the heating unit and the simulation unit respectively, and is used to monitor various data generated by the reaction of the carbonic acid solution in the target rock core.
2. The carbon dioxide sequestration simulation experimental apparatus according to claim 1, characterized in that, The simulation unit includes a first test component and a second test component. The inlets of the first test component and the second test component are respectively connected to the outlet of the heating unit, and the first test component and the second test component are respectively connected to the monitoring unit for signal connection. The first test component and the second test component are used to introduce a carbonic acid solution into the same or different target rock cores.
3. The carbon dioxide sequestration simulation experimental apparatus according to claim 2, characterized in that, The first test assembly includes a clamp, a ring presser, and a test pipeline. The clamp is used to mount the target rock core. The ring presser is disposed outside the target rock core and is used to apply radial pressure to the target rock core. The test pipeline connects to multiple injection ports and outlets of the target rock core, and the test pipeline is connected to the outlet of the heating unit.
4. The carbon dioxide sequestration simulation experimental apparatus according to claim 3, characterized in that, The first test component also includes a collector connected to the end outlet of the test pipeline for collecting the reaction products of the carbonic acid solution and the target rock core.
5. The carbon dioxide sequestration simulation experimental apparatus according to claim 4, characterized in that, The first test component also includes a first valve and a pressure gauge. The first valve and the pressure gauge are both installed on the test pipeline and located at the inlet front end and outlet rear end of the target rock core, respectively. The first valve and the pressure gauge are respectively connected to the monitoring unit for signal transmission.
6. The carbon dioxide sequestration simulation experimental apparatus according to claim 5, characterized in that, The structure of the second test component is the same as that of the first test component.
7. The carbon dioxide sequestration simulation experimental apparatus according to claim 6, characterized in that, The simulation unit also includes a ring-shaped passage, the inlet of which is connected to the outlet of the heating unit, and the two outlets of which are respectively connected to the inlet of the second test component of the first test component. A second valve is also provided on the ring path, and the second valve is connected to the monitoring unit for signal transmission.
8. The carbon dioxide sequestration simulation experimental apparatus according to claim 1, characterized in that, The mixture preparation unit includes a carbon dioxide cylinder, a water tank, a mixer, and a mixing pipeline. The outlets of the carbon dioxide cylinder and the water tank are respectively connected to the inlet of the mixer. The outlet of the mixer is connected to the mixing pipeline, and the outlet of the mixing pipeline is connected to the inlet of the heating unit.
9. The carbon dioxide sequestration simulation experimental apparatus according to claim 1, characterized in that, It also includes a gas venting unit, which is connected in sequence to the mixture preparation unit, the heating unit and the simulation unit, and is used to vent the gas in the device.
10. A method for simulating carbon dioxide sequestration experiments, implemented using the experimental apparatus described in any one of claims 1-9, characterized in that, Includes the following steps: The target rock core is clamped in the simulation unit, and multiple injection ports located along the axial direction of the target rock core are connected to the outlet of the heating unit. Carbonic acid solution is prepared using a mixture preparation unit; The prepared carbonate solution is heated to the set temperature using a heating unit. The heated carbonic acid solution is injected into the target rock core through different injection ports as needed; The monitoring unit monitors various data generated by the reaction of carbonated solutions injected from different injection ports with the target rock core.