A device for obtaining the fluid of the entire process of high temperature and high pressure mineralization and sealing of core with high fidelity

Abstract

The present invention provides a device for accurately obtaining fluids during the entire process of high-temperature and high-pressure mineralization and sealing of a core, and belongs to the technical field of carbon dioxide geological carbon sealing. The device for accurately obtaining fluids during the entire process of high-temperature and high-pressure mineralization and sealing of a core comprises: a high-pressure carbon dioxide gas supply device, comprising a carbon dioxide gas tank, a carbon dioxide booster pump and a gas flow meter, the carbon dioxide gas tank being connected in sequence to the carbon dioxide booster pump and the gas flow meter through a pipeline to a carbon dioxide gas inlet at the top of a reactor body; a reactor body; a pressure and temperature recording and control system; a multi-layered, accurate sampling and transfer system, comprising multiple accurate sampling tubes, a sampling system end control valve, a connecting tube, a sampling system control valve and multiple reaction fluid samplers. The present invention solves the problem of how to accurately obtain reaction fluids at different layers of the core while keeping the reactor closed and maintaining the temperature and pressure in the reactor unchanged, and revealing the dynamic characteristics of the carbon dioxide mineralization and sealing process.

Description

Technical Field

[0001] The present invention belongs to the technical field of geological carbon sequestration of carbon dioxide, and specifically relates to a device for faithfully obtaining fluids from the entire process of high-temperature and high-pressure mineralization and sequestration of cores. Background Art

[0002] As global warming intensifies, geological carbon dioxide storage has become a key means of mitigating climate change. Among these technologies, CO2 mineralization storage achieves permanent storage by chemically reacting CO2 with minerals in the formation, converting it into stable carbonate minerals. This technology not only effectively reduces atmospheric CO2 concentrations but also utilizes natural mineral resources, providing a long-term, stable CO2 storage solution. Currently, only a few large-scale CO2 mineralization storage pilot projects have been implemented globally, such as the CarbFix project in Iceland and the Wallula project in the United States. These projects have demonstrated the feasibility and effectiveness of CO2 mineralization storage. However, due to the complexity and high cost of implementing these projects, laboratory simulations have become an important and cost-effective research method for studying the CO2 mineralization storage process. Laboratory simulations, which replicate the temperature, pressure, and fluid environments found in formations using high-temperature and high-pressure reactors, can simulate CO2-water-rock interactions on geological timescales in a relatively short period of time, providing a scientific basis for the development and application of CO2 mineralization storage technology.

[0003] Although laboratory simulation has played an important role in the study of carbon dioxide mineralization and storage, the existing technology still has the following shortcomings: the existing technology mainly focuses on the changes in mineral composition before and after the mineralization reaction, but ignores the dynamic changes of the fluid during the reaction. Since the high-temperature and high-pressure reactor cannot be opened during the experiment, how to obtain the reaction fluid with fidelity while maintaining the temperature and pressure in the reactor has become a technical problem that needs to be solved urgently. The existing technology usually studies the core as a whole, ignoring the differences in the carbon dioxide mineralization reaction between different layers of the core. This single sampling method is difficult to fully reflect the dynamic characteristics of the carbon dioxide mineralization and storage process. The existing technology mainly relies on indirect parameters such as pH value and electrical conductivity to evaluate the effect of carbon dioxide mineralization and storage, and lacks direct analysis of the concentration and type of anions and cations in the reaction fluid caused by mineral dissolution and new mineral formation, resulting in the process experimental data being not comprehensive and accurate. Summary of the Invention

[0004] In view of this, the present invention provides a device for faithfully obtaining fluids during the entire process of high-temperature and high-pressure mineralization and storage of cores, which solves the problem of obtaining reaction fluids in carbon dioxide-water-rock interaction simulation experiments under high-temperature and high-pressure conditions.

[0005] The present invention is achieved in that:

[0006] The present invention provides a device for obtaining fluids in the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity, which includes:

[0007] A high-pressure carbon dioxide gas supply device, comprising a carbon dioxide gas tank, a carbon dioxide booster pump, and a gas flow meter. The carbon dioxide gas tank is sequentially connected to the carbon dioxide booster pump and the gas flow meter through a pipeline to the carbon dioxide gas inlet on the top of the reactor body;

[0008] A reactor body is used to contain the core and formation water. A heating layer is provided inside the reactor body to increase the temperature during the reaction process.

[0009] The pressure and temperature recording and control system is used to monitor and control the temperature and pressure in the reactor in real time, and control the booster pump to adjust the pressure in the reactor;

[0010] A multi-layer fidelity sampling and transfer system includes multiple fidelity sampling tubes, a sampling system end control valve, a connecting pipe, a first sampling system control valve, a second sampling system control valve and multiple reaction fluid samplers. The fidelity sampling tubes are connected to the reactor body through the first sampling system control valve and the second sampling system control valve. The sampling system end control valve is connected to the vacuum pump through the connecting pipe, which is used to extract the air in the reaction fluid sampler and form a vacuum environment, so as to facilitate the acquisition of reaction fluid and transfer it to the reaction fluid sampler.

[0011] The present invention provides a device for faithfully capturing fluids from the entire high-temperature, high-pressure mineralization and storage process of rock cores. By integrating a high-pressure carbon dioxide supply, a high-temperature, high-pressure reactor, a pressure and temperature recording and control system, and a multi-layer, faithful sampling and transfer system, the device can simulate the coupled carbon dioxide-water-rock reaction process under actual formation conditions, faithfully capturing mineralization reaction fluids from different layers of the core. The device boasts a rational structure, comprehensive functionality, and precise control of experimental conditions, providing a reliable experimental platform for studying the carbon dioxide mineralization and storage process.

[0012] On the basis of the above technical solution, the device for obtaining fluids during the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity of the present invention can also be improved as follows:

[0013] A carbon dioxide inlet is provided on the top of the reactor body, which is connected to a gas flow meter through a pipeline and is used to quantitatively inject pressurized carbon dioxide gas into the injection hole in the middle of the core;

[0014] A reaction background fluid sampling tube is provided inside the reactor body. The reaction background fluid sampling tube is located below the formation water level and is used to obtain the background fluid of the mineralization reaction process in real time.

[0015] A pressure relief valve is provided on the top of the reactor body, and the pressure relief valve is connected to the interior of the reactor body through a pipeline. The pressure relief valve is used to release the pressure in the reactor after the experiment is completed or in an emergency.

[0016] The beneficial effects of adopting the above-mentioned improved solution are as follows: by connecting the carbon dioxide inlet to a gas flowmeter and a gas booster pump, the injection flow and pressure of the carbon dioxide can be precisely controlled, ensuring the stability of the carbon dioxide state (such as the supercritical state) during the experiment, thereby truly simulating the carbon dioxide injection process under formation conditions. The reaction background fluid sampling tube is located below the formation water level, which can obtain background fluid that does not participate in the reaction, providing control data for the experiment and facilitating the accurate analysis of geochemical changes during the carbon dioxide mineralization and storage process. The setting of the pressure relief valve can slowly release the pressure in the kettle after the experiment or in an emergency, avoiding damage to the equipment or sample caused by a sudden pressure drop, and ensuring the safety of the experimental process and the integrity of the samples.

[0017] Furthermore, the core is provided with a central injection hole along the central axis for injecting carbon dioxide. The length of the central injection hole in the core is less than the length of the core. The difference between the length of the core and the length of the central injection hole in the core is equal to the diameter of the central injection hole in the core. The distance between the end of the central injection hole in the core and the end of the core is equal to the diameter of the central injection hole in the core. A section of the core that is not penetrated by the central injection hole in the core needs to be retained at the end of the core to simulate the carbon dioxide injection channel during the implementation of the project.

[0018] The benefits of this improved approach include: the design of the injection hole in the center of the core simulates the CO2 injection pathway within the formation, ensuring even distribution and participation in the mineralization reaction. A plug at the end of the drill hole prevents direct CO2 leakage, improving the accuracy and reliability of the experiment and ensuring a realistic simulation of the CO2 injection process within the formation.

[0019] Furthermore, a plurality of core side injection holes are provided on the side of the core, which simulate the lateral migration channels during the carbon dioxide injection process. The core side injection holes are used to place the reaction fluid sampling tube in the core. The diameter of the core side injection hole is equal to the diameter of the injection hole in the middle of the core. The core side injection holes are equidistantly distributed along the side of the core, and the distance between adjacent core side injection holes is equal to twice the diameter of the core side injection hole, which is used to place the reaction fluid sampling tube in the core.

[0020] Furthermore, the pressure and temperature recording and control system includes a temperature and pressure monitoring probe, a temperature and pressure controller and a control terminal. The temperature and pressure monitoring probe is arranged inside the reactor body for real-time monitoring and control of the temperature and pressure inside the reactor body, and is connected to the control terminal through the temperature and pressure controller. One end of the temperature and pressure controller is connected to the temperature and pressure monitoring probe through a cable, one end is connected to the control terminal through a cable, and the other end is connected to the carbon dioxide booster pump through a cable. When the pressure in the reactor changes, the control terminal adjusts the booster pump through the temperature and pressure controller to supplement carbon dioxide gas to ensure that the pressure in the reactor is constant.

[0021] The beneficial effects of this improved solution include: the temperature and pressure monitoring probe, along with the temperature and pressure controller and control terminal, can monitor and record the temperature and pressure data within the reactor in real time. The control terminal automatically adjusts experimental conditions, ensuring precise control of the experimental process and data reliability. The control terminal, or the temperature and pressure data recording and control computer, is the core control unit of the experimental apparatus, used to monitor and adjust experimental conditions in real time, ensuring accuracy and stability. Example model: Dell OptiPlex 7090 Ultra.

[0022] Furthermore, quick connectors are provided at both ends of the connecting pipe, which are sealed with the end control valve and vacuum pump of the sampling system respectively for sample transfer. A sealing ring or a threaded locking structure is provided at the interface between the connecting pipe and the fidelity sampling tube and the vacuum pump.

[0023] Furthermore, the reaction fluid sampling tube in the core includes multiple real-time sampling tubes, which are respectively inserted into the injection holes on the side of the core and evenly distributed from the top to the bottom of the core, for real-time acquisition of reaction fluids in different layers of the core during the reaction process.

[0024] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the setting of the reaction fluid sampling tube in the core can obtain the reaction fluid in different layers of the core in real time during the reaction process, avoiding the change of fluid composition caused by the sampling time delay in the traditional sampling method, and ensuring the fidelity of the experimental data.

[0025] Furthermore, the multi-layer fidelity sampling and transfer system includes multiple fidelity sampling tubes, each of which is connected to the reactor body through a first sampling system control valve and a second sampling system control valve. The end of the fidelity sampling tube is connected to the connecting pipe through the sampling system end control valve for extracting and transferring the reaction fluid. The fidelity sampling tube and the reactor body are connected by connecting screws.

[0026] The first and second sampling system control valves, respectively located at the connection between the fidelity sampling tube and the high-temperature, high-pressure reactor, control the flow of reaction fluid from the reactor into the sampling tube. The multi-layered, fidelity sampling and transfer system, through the coordinated action of the first, second, and terminal control valves, enables precise extraction and transfer of reaction fluids, ensuring the fidelity and repeatability of the sampling process.

[0027] Furthermore, the carbon dioxide booster pump is located downstream of the carbon dioxide gas tank, and is used to increase the gas pressure output by the carbon dioxide gas tank, and control and calculate the injection flow of carbon dioxide through a gas flow meter. The gas flow meter is located downstream of the carbon dioxide booster pump and is connected to the carbon dioxide gas inlet at the top of the reactor body through a pipeline.

[0028] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the carbon dioxide booster pump can increase the gas pressure in the carbon dioxide tank from 5MPa to the pressure required for the experiment, ensuring that the carbon dioxide reaches a supercritical state in the high-temperature and high-pressure reactor, and truly simulates the carbon dioxide state under formation conditions.

[0029] Furthermore, the carbon dioxide gas tank and the reaction fluid sampler are located outside the reactor body, and the reaction fluid sampler is used to store the reaction fluid transferred from the fidelity sampling tube.

[0030] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the fidelity acquisition reaction fluid sampler can store the reaction fluid transferred from the fidelity sampling tube, ensuring that the fluid composition does not change during the transfer process, and providing high-quality samples for subsequent geochemical testing.

[0031] Compared with the prior art, the device provided by the present invention for obtaining fluids during the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity has the following beneficial effects:

[0032] 1. Fidelity acquisition of reactive fluids: This invention utilizes a multi-layer, authentic sampling and transfer system to accurately acquire reactive fluids from different layers of the core under high-temperature and high-pressure conditions, ensuring that the fluid composition remains unchanged during the sampling and transfer process. This technology addresses the problem of fluid composition changes caused by sampling delays or external interference in traditional methods, providing high-quality experimental data for research on the mineralization and storage of carbon dioxide.

[0033] 2. Revealing stratum differential characteristics: By setting multiple sampling points on the side of the core, this method can fully cover different layers of the core and reveal the stratum differential characteristics of CO2 mineralization reactions at the core scale. This multi-point sampling method overcomes the shortcomings of the traditional single sampling point method and provides a more comprehensive experimental basis for in-depth research on the CO2 mineralization and storage process;

[0034] 3. Provide comprehensive experimental data: This method not only measures changes in the concentration and type of anions and cations in the reaction fluid, but also comprehensively analyzes the dynamic characteristics of the CO2 mineralization reaction by combining changes in the amount of injected CO2 and the pressure within the reactor. This multi-parameter comprehensive analysis method provides more comprehensive experimental data for accurate assessment of the CO2 mineralization and storage efficiency.

[0035] 4. Improve experimental efficiency and safety:

[0036] This invention significantly improves experimental efficiency through an automated control system and modular design. For example, the control terminal automatically adjusts experimental conditions, reducing manual operation. The multi-layer, position-preserving sampling and transfer system enables rapid sampling and transfer, shortening experimental time. Furthermore, the design of the pressure relief valve and the screws connecting the sampling system to the reactor ensures the safety of the experimental process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the connection between the reactor body and the reaction fluid sampler of the present invention;

[0038] Figure 2 It is a connection diagram of the present invention;

[0039] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0040] 1. CO2 inlet; 10. Fidelity sampling tube; 11. Connecting screw; 12. Sampling system end control valve; 13. Connecting tube; 14. Pressure relief valve; 15. CO2 booster pump; 16. Gas flow meter; 17. Control terminal; 18. Temperature and pressure controller; 19. CO2 tank; 2. Temperature and pressure monitoring probe; 20. Reaction fluid sampler; 3. Reactor body; 4. Core; 5. Injection hole in the middle of the core; 6. Injection hole on the side of the core; 7. Reaction fluid sampling tube in the core; 71. Reaction background fluid sampling tube; 8. Control valve for the first sampling system; 9. Control valve for the second sampling system. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0042] like Figure 2 FIG. 1 is a schematic diagram of a first embodiment of a device for obtaining fluids in the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity provided by the present invention. In this embodiment, the device comprises:

[0043] A high-pressure carbon dioxide gas supply device includes a carbon dioxide gas tank 19, a carbon dioxide booster pump 15, and a gas flow meter 16. The carbon dioxide gas tank 19 is connected to the gas flow meter 16 and the carbon dioxide booster pump 15 in sequence through a pipeline, and then to the carbon dioxide gas inlet 1 at the top of the reactor body 3;

[0044] The reactor body 3 is used to accommodate the core 4 and formation water. A heating layer is provided inside the reactor body 3 to increase the temperature during the reaction process.

[0045] The pressure and temperature recording and control system is used to monitor and control the temperature and pressure inside the reactor in real time, and control the booster pump to adjust the pressure inside the reactor;

[0046] The multi-layer fidelity sampling and transfer system includes multiple fidelity sampling tubes 10, a sampling system end control valve 12, a connecting pipe 13, a first sampling system control valve 8, a second sampling system control valve 9 and multiple reaction fluid samplers 20. The fidelity sampling tubes 10 are connected to the reactor body 3 through the first sampling system control valve 8 and the second sampling system control valve 9. The sampling system end control valve 12 is connected to the vacuum pump through the connecting pipe 13, which is used to extract the air in the reaction fluid sampler and form a vacuum environment, so as to facilitate the extraction of the reaction fluid and transfer it to the reaction fluid sampler 20.

[0047] The heating layer can be made of metal or non-metal materials. Metal materials include stainless steel, Hastelloy, and titanium alloys, while non-metal materials include silicon carbide (SiC) ceramics and quartz glass. The heating layer can be implemented using a fluid circulation heating layer or electromagnetic induction heating.

[0048] The specific implementation of the fluid circulation heating layer structure is to circulate high-temperature thermal oil / steam in the reactor jacket or coil, and control the temperature through an external heat exchanger. The specific implementation of the electromagnetic induction heating structure is to wind an induction coil outside the reactor and heat the reactor body through the eddy current effect.

[0049] In the above technical solution, a carbon dioxide inlet 1 is provided on the top of the reactor body 3, and the carbon dioxide inlet 1 is connected to a carbon dioxide booster pump 15 through a pipeline, so as to inject pressurized carbon dioxide gas into the injection hole 5 in the middle of the core;

[0050] like Figure 1 As shown, a reaction background fluid sampling tube 71 is provided inside the reactor body 3. The reaction background fluid sampling tube 71 is located below the formation water level and is used to obtain the reaction background fluid.

[0051] A pressure relief valve 14 is provided on the top of the reactor body 3. The pressure relief valve 14 is connected to the interior of the reactor body 3 through a pipeline. The pressure relief valve 14 is used to release the pressure in the reactor after the experiment is completed or in an emergency.

[0052] Furthermore, in the above technical solution, the core 4 is provided with a central injection hole 5 along the central axis for injecting carbon dioxide. The length of the central injection hole 5 is less than the length of the core 4. The difference between the length of the core 4 and the length of the central injection hole 5 is equal to the diameter of the central injection hole 5 in the core. The distance between the end of the central injection hole 5 in the core and the end of the core is equal to the diameter of the central injection hole 5 in the core. A section of the core that is not penetrated by the central injection hole in the core needs to be retained at the end of the core to simulate the carbon dioxide injection channel during the implementation of the project.

[0053] Furthermore, in the above technical solution, a plurality of core side injection holes 6 are provided on the side of the core 4. The core side injection holes 6 simulate the lateral migration channels during the carbon dioxide injection process. The core side injection holes 6 are used to place the reaction fluid sampling tube 7 in the core. The diameter of the core side injection hole 6 is equal to the diameter of the injection hole 5 in the middle of the core. The core side injection holes 6 are equidistantly distributed along the side of the core 4. The distance between adjacent core side injection holes 6 is equal to twice the diameter of the core side injection hole 6, which is used to place the reaction fluid sampling tube 7 in the core.

[0054] Furthermore, in the above technical solution, the pressure and temperature recording and control system includes a temperature and pressure monitoring probe 2, a temperature and pressure controller 18 and a control terminal 17. The temperature and pressure monitoring probe 2 is arranged inside the reactor body 3 for real-time monitoring and control of the temperature and pressure inside the reactor body, and is connected to the control terminal 17 through the temperature and pressure controller 18. One end of the temperature and pressure controller 18 is connected to the temperature and pressure monitoring probe 2 through a cable, one end is connected to the control terminal 17 through a cable, and the other end is connected to the carbon dioxide booster pump through a cable.

[0055] Furthermore, in the above technical solution, quick connectors are provided at both ends of the connecting tube 13, which are sealed with the end control valve and vacuum pump of the sampling system respectively for sample transfer, and a sealing ring or a threaded locking structure is provided at the interface between the connecting tube and the fidelity sampling tube and the vacuum pump.

[0056] Furthermore, in the above technical solution, the reaction fluid sampling tube 7 in the core includes multiple real-time sampling tubes, which are respectively inserted into the injection holes 6 on the side of the core and evenly distributed from the top to the bottom of the core, for real-time acquisition of the reaction fluid in different layers of the core during the reaction process.

[0057] Furthermore, in the above technical solution, the multi-layer fidelity sampling and transfer system includes multiple fidelity sampling tubes 10, each fidelity sampling tube 10 is connected to the reactor body 3 through a first sampling system control valve 8 and a second sampling system control valve 9, and the end of the fidelity sampling tube 10 is connected to the connecting pipe 13 through a sampling system end control valve 12, which is used to extract and transfer the reaction fluid. The fidelity sampling tube 10 and the reactor body 3 are connected by a connecting screw 11.

[0058] Furthermore, in the above technical solution, the carbon dioxide booster pump 15 is located downstream of the carbon dioxide tank 19, and is used to increase the gas pressure output from the carbon dioxide tank 19, and control and calculate the injection flow of carbon dioxide through the gas flow meter 16. The carbon dioxide booster pump 15 is located downstream of the gas flow meter 16 and is connected to the carbon dioxide inlet 1 at the top of the reactor body 3 through a pipeline.

[0059] Furthermore, in the above technical solution, the carbon dioxide gas tank 19 and the reaction fluid sampler 20 are located outside the reactor body 3 , and the reaction fluid sampler 20 is used to store and transfer the reaction fluid in the fidelity sampling tube 10 .

[0060] like Figure 2 The figure shows a schematic diagram of the second embodiment of the present invention, which is realized by the following technical scheme: under the simulation of different pressure and temperature conditions, without changing the temperature and pressure conditions in the reactor, the mineralization reaction fluids in different layers of the core during the carbon dioxide injection process are obtained with fidelity, the process of dissolution of original minerals and resulting changes in the concentration of anions and cations in the solution during the carbon dioxide-water-rock coupling reaction under actual formation conditions is simulated, and the carbon dioxide mineralization and storage process is revealed from a geochemical perspective.

[0061] A device for obtaining the reaction fluid of the whole process of high-temperature and high-pressure carbon dioxide mineralization and storage at different layers of the core with high fidelity, mainly including a high-pressure carbon dioxide gas supply device, a high-temperature and high-pressure reactor, a pressure and temperature recording and control system, and a multi-layer fidelity sampling and transfer system.

[0062] The main implementation method of this simulation device includes the following steps:

[0063] 1. Sample Pretreatment: Core samples are processed. A 1cm diameter hole, less than 1cm in length, is drilled along the core's central axis. Drilling stops 1cm from the end of the core to ensure a 1cm blockage at the bottom of the core. This hole simulates the CO2 injection channel. 1cm diameter holes are drilled sequentially along the side of the core perpendicular to the drilling direction at 2cm intervals. These are the side injection holes.

[0064] 2. Prepare formation water: Based on the geological conditions of the study area and the geochemical composition of the formation water obtained in the early drilling, prepare sufficient formation water. The formation water is prepared using analytically pure reagents and deionized water.

[0065] 3. Sample Placement: First, rinse the components within the reactor with deionized water, then rinse the reactor with the formation water prepared in step 2. Then, place the core in the high-temperature, high-pressure reactor. Simultaneously, insert the CO2 injection tube into the central injection hole in the core. Place five core-inside reaction fluid sampling tubes in side holes drilled in the core to obtain real-time information about the reaction fluid during the reaction. After the sample is placed, add the prepared formation water to the reactor. The depth of the formation water should exceed the core and reach above the end of the reaction background fluid sampling tube. Install the high-temperature, high-pressure reactor lid and tighten all screws.

[0066] 4. Check air tightness: Connect the carbon dioxide cylinder to the carbon dioxide booster pump and the gas flow meter, and then connect it to the carbon dioxide inlet on the top of the reactor. Check the valve of the carbon dioxide cylinder, the inlet and outlet valves of the booster device, rotate the pressure regulating valve counterclockwise to the end, and check that the 6 real-time sampling system valves are closed.

[0067] 5. Start the experiment: First, open the carbon dioxide tank, open the gas flow meter valve, open the gas booster inlet valve and the driving gas inlet valve, so that the carbon dioxide pressure in the booster device is increased from 5MPa output by the gas cylinder to the required pressure, and open the valve to allow the pressurized carbon dioxide gas to enter the kettle. Since the temperature in the kettle exceeds the supercritical temperature, the gas will become supercritical the moment it enters the reactor, which is consistent with the carbon dioxide state simulated in the experiment. Continue to inject carbon dioxide for a period of time, observe the pressure changes in the kettle, and set the stable pressure value in the kettle through the control terminal. As the reaction consumes carbon dioxide, the control system will control the gas booster system to continue supplying gas to stabilize the pressure value in the reactor.

[0068] Software configuration of the control terminal:

[0069] Experimental parameter setting: Create a user interface in LabVIEW software to set experimental parameters, such as target temperature (e.g., 100°C), target pressure (e.g., 10 MPa), and carbon dioxide injection flow rate (e.g., 10 mL / min).

[0070] Data acquisition program: Write a LabVIEW program to collect temperature and pressure data transmitted by the temperature and pressure monitoring probe in real time, and store the data in the SSD of the control computer.

[0071] Automatic control program: A LabVIEW program was developed to automatically adjust the heating and pressurization systems based on the collected temperature and pressure data to ensure the stability of experimental conditions. For example, if the temperature inside the reactor falls below the set point, the heating power is increased; if the pressure inside the reactor falls below the set point, the carbon dioxide injection pressure is increased.

[0072] 6. Fidelity Fluid Sample Acquisition: After the reaction has run for 8 hours, the reaction fluid is collected. First, open the sampling system end control valve at the end of the sampler. Connect the sampling port to the vacuum pump and evacuate the sampler. Wait 5 minutes. Once the evacuation is complete, close the sampling system end control valve. Then, sequentially open the two control valves connecting the sampler to the reactor—the first sampling system control valve and the second sampling system control valve—to allow the reaction fluid to enter the fidelity sampling tube. Once the fluid enters the fidelity sampling tube, wait 2-3 minutes. Then, close the two control valves at the reactor connection. Open the sampling system end control valve to transfer the reaction fluid to a sampling bottle or experimental tube for subsequent geochemical testing. Following this sampling process, the fidelity sampler is sequentially used to collect reaction fluid for subsequent geochemical testing. Since the experimental cycle generally lasts for more than 480 hours, sampling stages should be planned, such as 8 hours, 18 hours, 28 hours, and so on, after the reaction begins. Systematic sampling allows for full-cycle control and monitoring of the CO2 mineralization and storage process in the core.

[0073] 7. End of the experiment: After one cycle of the experiment is completed, first adjust the temperature to stabilize at room temperature, then slowly open the pressure relief valve to release the pressure in the kettle. When the pressure drops to 0, unscrew the screws of the kettle cover, take out the core sample, remove the remaining liquid, and use deionized water to clean the reactor and related samplers.

[0074] Specifically, the principle of the present invention is:

[0075] The high-temperature and high-pressure environment of formation conditions is simulated using a high-temperature and high-pressure reactor and temperature and pressure monitoring probes. The reactor is constructed from high-strength, corrosion-resistant materials and can withstand high temperatures (up to 200°C) and high pressures (up to 50 MPa) under experimental conditions. The temperature and pressure monitoring probes monitor the temperature and pressure inside the reactor in real time and transmit the data to the temperature and pressure controller and control terminal to ensure the stability of experimental conditions.

[0076] Carbon dioxide gas is injected into the injection hole in the center of the core using a high-pressure carbon dioxide gas supply device, and the injection rate and pressure of the carbon dioxide are adjusted using a gas flow meter and a carbon dioxide booster pump. When the temperature inside the reactor exceeds the supercritical temperature of carbon dioxide (31.1°C), the carbon dioxide gas enters the reactor and instantly becomes supercritical, simulating the state of carbon dioxide in the formation.

[0077] By combining core and formation water, the coupled reaction of CO2, water, and rock under field formation conditions is simulated. After CO2 injection, geochemical reactions occur with formation water and rock, dissolving existing minerals and causing changes in the concentration of anions and cations in the solution.

[0078] The fidelity acquisition and transfer of reaction fluids is achieved through a multi-layer fidelity sampling and transfer system. The fidelity sampling tube is connected to the high-temperature and high-pressure reactor through the first sampling system control valve and the second sampling system control valve. The reaction fluid is extracted by a vacuum pump and transferred to the fidelity acquisition reaction fluid sampler.

[0079] Experimental data is recorded via a control terminal and, combined with subsequent geochemical testing, reveals the mechanisms and processes of CO2 mineralization and storage. For example, by analyzing changes in ion concentrations in the reaction fluid, the efficiency and potential of CO2 mineralization and storage can be assessed.

[0080] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A device for obtaining the fluid of the entire process of high temperature and high pressure mineralization and storage of cores with high fidelity, characterized by: include: A high-pressure carbon dioxide gas supply device includes a carbon dioxide gas tank, a carbon dioxide booster pump, and a gas flow meter. The carbon dioxide gas tank is sequentially connected to the carbon dioxide booster pump, the gas flow meter, and the carbon dioxide gas inlet on the top of the reactor body; The reactor body is used to accommodate the core and formation water. The top of the reactor body is provided with a carbon dioxide inlet, which is connected to a gas flowmeter through a pipeline for injecting pressurized carbon dioxide gas into the central injection hole of the core. The core is provided with a central injection hole along the central axis for injecting carbon dioxide. The length of the central injection hole in the core is less than the length of the core. The difference between the length of the core and the length of the central injection hole in the core is equal to the diameter of the central injection hole in the core. The distance between the end of the central injection hole in the core and the end of the core is equal to the diameter of the central injection hole in the core. A section of the core that is not penetrated by the central injection hole in the core is retained at the end of the core to simulate the carbon dioxide injection channel. A reaction background fluid sampling tube is provided inside the reactor body. The reaction background fluid sampling tube is located below the formation water level and is used to obtain reaction background fluid. A pressure relief valve is provided on the top of the reactor body. The pressure relief valve is connected to the interior of the reactor body through a pipeline. The pressure relief valve is used to release the pressure in the reactor after the experiment. A heating layer is provided inside the reactor body, and the heating layer is used to achieve temperature increase during the reaction process. Pressure and temperature recording and control system, used to monitor and control the temperature and pressure inside the reactor in real time; A multi-layer fidelity sampling and transfer system, comprising a plurality of fidelity sampling tubes, a sampling system terminal control valve, a connecting pipe, a first sampling system control valve, a second sampling system control valve, and a plurality of reaction fluid samplers. The fidelity sampling tubes are connected to the reactor body through the first sampling system control valve and the second sampling system control valve. The sampling system terminal control valve is connected to a vacuum pump through a connecting pipe for extracting reaction fluid and transferring it to the reaction fluid sampler. The core side is provided with a plurality of core side injection holes, which simulate the lateral migration channels during the carbon dioxide injection process. The core side injection holes are used to place the core reaction fluid sampling tube. The diameter of the core side injection hole is equal to the diameter of the injection hole in the middle of the core. The core side injection holes are evenly distributed along the core side. The distance between adjacent core side injection holes is equal to twice the diameter of the core side injection hole. The core side injection holes are used to place the core reaction fluid sampling tube to simulate the lateral migration process in the formation during the carbon dioxide injection process.

2. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 1 is characterized in that: The pressure and temperature recording and control system includes a temperature and pressure monitoring probe, a temperature and pressure controller, and a recording control terminal. The temperature and pressure monitoring probe is arranged inside the reactor body, and is used to monitor and control the temperature and pressure inside the reactor body in real time, and is connected to the control terminal through the temperature and pressure controller. One end of the temperature and pressure controller is connected to the temperature and pressure monitoring probe through a cable, one end is connected to the control terminal through a cable, and the other end is connected to the carbon dioxide booster pump through a cable. When the pressure inside the reactor changes, the control terminal adjusts the booster pump through the temperature and pressure controller to supplement carbon dioxide gas to maintain a constant pressure inside the reactor.

3. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 2 is characterized in that: The connecting pipe is provided with quick connectors at both ends, which are sealed with the end control valve and vacuum pump of the sampling system respectively for sample transfer. The interface between the connecting pipe and the fidelity sampling tube and vacuum pump is provided with a sealing ring or a threaded locking structure.

4. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 3 is characterized in that: The reaction fluid sampling tube in the core includes multiple real-time sampling tubes, which are respectively inserted into the injection holes on the side of the core and evenly distributed from the top to the bottom of the core, and are used to obtain the reaction fluid at different layers of the core in real time during the reaction process.

5. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 4 is characterized in that: The multi-layer fidelity sampling and transfer system includes multiple fidelity sampling tubes, each of which is connected to the reactor body through a first sampling system control valve and a second sampling system control valve. The end of the fidelity sampling tube is connected to the connecting pipe through the sampling system end control valve for extracting and transferring the reaction fluid. The fidelity sampling tube and the reactor body are connected by connecting screws.

6. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 5 is characterized in that: The carbon dioxide booster pump is located downstream of the carbon dioxide gas tank and is used to increase the gas pressure output by the carbon dioxide gas tank and control and calculate the injection flow of carbon dioxide through a gas flow meter. The gas flow meter is located downstream of the carbon dioxide booster pump and is connected to the carbon dioxide gas inlet at the top of the reactor body through a pipeline.

7. The device for obtaining the fluid of the entire process of high-temperature and high-pressure mineralization and storage of cores with high fidelity according to claim 6 is characterized in that: The carbon dioxide gas tank and the reaction fluid sampler are located outside the reactor body, and the reaction fluid sampler is used to store the reaction fluid transferred from the fidelity sampling tube.

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