Device for obtaining fluid in whole process of high-temperature and high-pressure mineralization and storage of rock core in fidelity manner

Abstract

The invention provides a device for obtaining fluid in the whole high-temperature and high-pressure mineralization and storage process of a rock core in a fidelity mode, and belongs to the technical field of carbon dioxide geological carbon storage. Comprising a carbon dioxide gas tank, a carbon dioxide booster pump and a gas flow meter, and the carbon dioxide gas tank is sequentially connected with the carbon dioxide booster pump and the gas flow meter through pipelines till a carbon dioxide gas inlet in the top of a reaction kettle body; a reaction kettle body; a pressure and temperature recording and control system; the multi-layer fidelity sampling and transferring system comprises a plurality of fidelity sampling pipes, a sampling system tail end control valve, a connecting pipe, a sampling system control valve and a plurality of reaction fluid samplers, and solves the problem of how to acquire reaction fluid at different layers of a rock core in a fidelity manner under the condition of keeping the reaction kettle not opened and keeping the temperature and pressure in the kettle unchanged. And the dynamic characteristics of the carbon dioxide mineralization and storage process are disclosed.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon dioxide geological carbon sequestration, and more specifically, relates to a device for accurately obtaining fluids throughout the entire process of high-temperature and high-pressure mineral sequestration of core samples. Background Art

[0002] With the exacerbation of the global warming problem, carbon dioxide geological sequestration technology has become one of the important means to mitigate climate change. Among them, carbon dioxide mineral sequestration technology converts carbon dioxide into stable carbonate minerals through chemical reactions with minerals in the formation, achieving the permanent sequestration of carbon dioxide. This technology can not only effectively reduce the concentration of carbon dioxide in the atmosphere but also utilize natural mineral resources to provide a long-term and stable carbon dioxide storage solution. Currently, only a few large-scale carbon dioxide mineral sequestration pilot projects have been carried out globally, such as the CarbFix project in Iceland and the Wallula project in the United States. These projects have verified the feasibility and effectiveness of carbon dioxide mineral sequestration. However, due to the complexity and high cost of engineering implementation, laboratory simulation has become an important and cost-effective research method for studying the carbon dioxide mineral sequestration process. Laboratory simulation reproduces the temperature, pressure, and fluid environment under formation conditions through a high-temperature and high-pressure reactor, and can simulate the carbon dioxide-water-rock interaction process on a geological time scale in a relatively short time, providing a scientific basis for the development and application of carbon dioxide mineral sequestration technology.

[0003] Although laboratory simulation has played an important role in the research of carbon dioxide mineral sequestration, the existing technologies still have the following deficiencies: The existing technologies mainly focus on the changes in mineral composition before and after the mineralization reaction, while ignoring the dynamic changes of fluids during the reaction process. Since the high-temperature and high-pressure reactor cannot be opened during the experiment, how to accurately obtain the reaction fluid while maintaining the temperature and pressure inside the reactor has become a technical problem to be solved urgently. The existing technologies usually study the core as a whole, ignoring the differences in different layers of the core during the carbon dioxide mineralization reaction. This single sampling method is difficult to comprehensively reflect the dynamic characteristics during the carbon dioxide mineral sequestration process. The existing technologies mainly rely on indirect parameters such as pH value and conductivity to evaluate the carbon dioxide mineral sequestration effect, lacking direct analysis of the concentration and types of anions and cations in the reaction fluid caused by mineral dissolution and new mineral formation, resulting in incomplete and inaccurate process experimental data. Summary of the Invention

[0004] In view of this, a device for accurately obtaining fluids throughout the entire process of high-temperature and high-pressure mineral sequestration of core samples provided by the present invention solves the problem of obtaining reaction fluids in the simulation experiment of carbon dioxide-water-rock interaction under high-temperature and high-pressure conditions.

[0005] The present invention is implemented as follows:

[0006] The present invention provides a device for truly obtaining fluids throughout the whole process of core high-temperature and high-pressure mineralization and sequestration, which includes:

[0007] A high-pressure carbon dioxide gas supply device, including a carbon dioxide gas tank, a carbon dioxide booster pump, and a gas flow meter. The carbon dioxide gas tank is connected to the carbon dioxide booster pump and the gas flow meter in sequence through a pipeline until the carbon dioxide inlet at the top of the reaction kettle body;

[0008] A reaction kettle body for accommodating the core and formation water. A heating layer is arranged inside the reaction kettle body, and the heating layer is used to realize the temperature rise during the reaction process;

[0009] A pressure and temperature recording and control system for real-time monitoring and controlling the temperature and pressure inside the reaction kettle, and controlling the booster pump to adjust the pressure inside the reaction kettle;

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

[0011] The technical effects of the device for truly obtaining fluids throughout the whole process of core high-temperature and high-pressure mineralization and sequestration provided by the present invention are as follows: By integrating a high-pressure carbon dioxide gas supply device, a high-temperature and high-pressure reaction kettle body, a pressure and temperature recording and control system, and a multi-layer true-fidelity sampling and transfer system, this device can simulate the reaction process of the carbon dioxide-water-rock coupling effect under actual formation conditions and truly obtain the mineralization reaction fluids at different layers of the core. The device has a reasonable structure and comprehensive functions, can accurately control the experimental conditions, and provides a reliable experimental platform for studying the process of carbon dioxide mineralization and sequestration.

[0012] On the basis of the above technical solution, the device for truly obtaining fluids throughout the whole process of core high-temperature and high-pressure mineralization and sequestration of the present invention can also be improved as follows:

[0013] Wherein, a carbon dioxide inlet is arranged at the top of the reaction kettle body, and the carbon dioxide inlet is connected to the gas flow meter through a pipeline, and is used for quantitatively injecting the pressurized carbon dioxide gas into the injection hole in the middle of the core;

[0014] A reaction background fluid sampling tube is arranged inside the reaction kettle body, and the reaction background fluid sampling tube is located below the liquid level of the formation water and is used for obtaining the background fluid during the mineralization reaction process in real time;

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

[0016] The beneficial effects of adopting the above improvement scheme are as follows: By connecting the carbon dioxide inlet to the gas flowmeter and the gas booster pump, the injection flow rate and pressure of carbon dioxide can be accurately controlled, ensuring the stability of the carbon dioxide state (such as the supercritical state) during the experiment, so as to truly simulate the carbon dioxide injection process under formation conditions. The reaction background fluid sampling pipe is located below the formation water level, which can obtain the background fluid that has not participated in the reaction, provide control data for the experiment, and help accurately analyze the geochemical changes during the carbon dioxide mineralization and sequestration process. The setting of the pressure relief valve can slowly release the pressure inside the reactor after the experiment or in case of an emergency, avoiding equipment damage or sample destruction caused by a sudden drop in pressure, and ensuring the safety of the experimental process and the integrity of the sample.

[0017] Further, a central injection hole is provided along the central axis of the core 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 reserved at the end of the core to simulate the carbon dioxide injection channel during the engineering implementation process.

[0018] The beneficial effects of adopting the above improvement scheme are as follows: The design of the central injection hole in the core can simulate the carbon dioxide injection channel in the formation, ensuring the uniform distribution of carbon dioxide and its participation in the mineralization reaction. A section of the hole is blocked at the end of the drill hole to prevent direct leakage of carbon dioxide, improving the accuracy and reliability of the experiment and ensuring the true simulation of the carbon dioxide injection process in the formation.

[0019] Further, a plurality of side injection holes are provided on the side of the core. The side injection holes in the core simulate the lateral migration channels during the carbon dioxide injection process. The side injection holes in the core are used to place the reaction fluid sampling pipe inside the core. The diameter of the side injection holes in the core is equal to the diameter of the central injection hole in the core. The side injection holes in the core are evenly distributed along the side of the core. The distance between adjacent side injection holes along the side of the core is equal to twice the diameter of the side injection holes in the core and is used to place the reaction fluid sampling pipe inside 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 reaction kettle body and is used to monitor and control the temperature and pressure inside the reaction kettle body in real time. It 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 a carbon dioxide booster pump through a cable. When the pressure inside the reaction kettle changes, the control terminal adjusts the booster pump through the temperature and pressure controller to supplement carbon dioxide gas to ensure the constant pressure inside the reaction kettle.

[0021] The beneficial effects of adopting the above improvement scheme are as follows: The cooperation of the temperature and pressure monitoring probe with the temperature and pressure controller and the control terminal can monitor and record the temperature and pressure data inside the kettle in real time, and automatically adjust the experimental conditions through the control terminal to ensure the precise control of the experimental process and the reliability of the data. The control terminal, namely the temperature and pressure data recording and control computer, is the core control unit of the experimental device of the present invention and is used to monitor and adjust the experimental conditions in real time to ensure the accuracy and stability of the experimental process. Model example: Dell OptiPlex 7090Ultra.

[0022] Furthermore, quick connectors are provided at both ends of the connecting pipe, which are hermetically connected to the end control valve of the sampling system and the vacuum pump respectively for sample transfer. Sealing rings or threaded locking structures are provided at the interfaces of the connecting pipe with the fidelity sampling pipe and the vacuum pump.

[0023] Furthermore, the reaction fluid sampling pipe inside the core includes a plurality of real-time sampling conduits, and the plurality of real-time sampling conduits are respectively inserted into the injection holes on the side of the core and are evenly distributed from the top to the bottom of the core for obtaining the reaction fluids at different layers of the core during the reaction process in real time.

[0024] The beneficial effects of adopting the above improvement scheme are as follows: The setting of the reaction fluid sampling pipe inside the core can obtain the reaction fluids at different layers of the core during the reaction process in real time, avoiding the change of fluid composition caused by 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 a plurality of fidelity sampling pipes. Each fidelity sampling pipe is connected to the reaction kettle body through a first sampling system control valve and a second sampling system control valve. The end of the fidelity sampling pipe is connected to the connecting pipe through an end control valve of the sampling system for extracting and transferring the reaction fluid. The fidelity sampling pipe is connected to the reaction kettle body through a connecting screw.

[0026] The first sampling system control valve and the second sampling system control valve are respectively arranged at the connection end of the fidelity sampling pipe and the high-temperature and high-pressure reactor body, and are used to control the flow of the reaction fluid from the reactor into the sampling pipe. Through the coordinated action of the first sampling system control valve, the second sampling system control valve and the sampling system end control valve, the multi-layer fidelity sampling and transfer system can achieve the precise extraction and transfer of the reaction fluid, 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 rate 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 inlet at the top of the reactor body through a pipeline.

[0028] The beneficial effect of adopting the above improvement scheme is that the carbon dioxide booster pump can increase the gas pressure in the carbon dioxide gas tank from 5 MPa to the pressure required for the experiment, ensuring that carbon dioxide reaches the supercritical state in the high-temperature and high-pressure reactor body and truly simulating the state of carbon dioxide 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 pipe.

[0030] The beneficial effect of adopting the above improvement scheme is that the fidelity acquisition reaction fluid sampler can store the reaction fluid transferred from the fidelity sampling pipe, ensuring that the fluid composition does not change during the transfer process and providing high-quality samples for subsequent geochemical tests.

[0031] Compared with the prior art, the beneficial effects of a device for faithfully acquiring fluids in the whole process of high-temperature and high-pressure mineralization and sequestration of cores provided by the present invention are:

[0032] 1. Realize the faithful acquisition of reaction fluids: Through the multi-layer fidelity sampling and transfer system of the present invention, reaction fluids at different layers of the core can be faithfully acquired under high-temperature and high-pressure conditions, ensuring that the fluid composition does not change during the sampling and transfer processes. This technology solves the problem of fluid composition change caused by sampling delay or external interference in traditional methods, and provides high-quality experimental data for the research on the carbon dioxide mineralization and sequestration process;

[0033] 2. Reveal the characteristics of layer differences: By arranging multiple sampling points on the side of the core, the present invention can comprehensively cover different layers of the core and reveal the characteristics of layer differences in the carbon dioxide mineralization reaction at the core scale. This multi-point sampling method makes up for the deficiency of a single sampling point in traditional methods and provides a more comprehensive experimental basis for in-depth research on the carbon dioxide mineralization and sequestration process;

[0034] 3. Provide comprehensive experimental data: The present invention can not only obtain the changes in the concentration and types of anions and cations in the reaction fluid, but also comprehensively analyze the dynamic characteristics of the carbon dioxide mineralization reaction by combining the amount of injected carbon dioxide and the change in pressure inside the reaction kettle. This comprehensive multi-parameter analysis method provides more comprehensive experimental data for the accurate evaluation of the carbon dioxide mineralization storage effect and storage efficiency;

[0035] 4. Improve experimental efficiency and safety:

[0036] The present invention significantly improves the experimental efficiency through an automated control system and modular design. For example, the control terminal can automatically adjust the experimental conditions, reducing manual operation; the multi-layer position-fidelity sampling and transfer system can achieve rapid sampling and transfer, shortening the experimental time. In addition, the design of the pressure relief valve and the connection screw of the sampling system to the reaction kettle ensures the safety of the experimental process. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0039] In the drawings, the list of components represented by each reference numeral is as follows:

[0040] 1. Carbon dioxide inlet; 10. Fidelity sampling tube; 11. Connection screw; 12. End control valve of the sampling system; 13. Connecting pipe; 14. Pressure relief valve; 15. Carbon dioxide booster pump; 16. Gas flowmeter; 17. Control terminal; 18. Temperature and pressure controller; 19. Carbon dioxide gas tank; 2. Temperature and pressure monitoring probe; 20. Reaction fluid sampler; 3. Reaction kettle 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 inside the core; 71. Background reaction fluid sampling tube; 8. First sampling system control valve; 9. Second sampling system control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, 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 in conjunction with the drawings in the embodiments of the present invention.

[0042] As Figure 2 shown, it is a schematic diagram of the first embodiment of a device for faithfully obtaining the whole-process fluid of core high-temperature and high-pressure mineralization storage provided by the present invention. In this embodiment, it includes:

[0043] High-pressure carbon dioxide supply device, including a carbon dioxide gas cylinder 19, a carbon dioxide booster pump 15 and a gas flowmeter 16. The carbon dioxide gas cylinder 19 is connected to the gas flowmeter 16 and the carbon dioxide booster pump 15 in sequence through pipelines until the carbon dioxide inlet 1 at the top of the reaction kettle body 3;

[0044] Reaction kettle body 3, used to accommodate the core 4 and formation water. A heating layer is arranged inside the reaction kettle body 3, and the heating layer is used to realize the temperature rise during the reaction process;

[0045] Pressure and temperature recording and control system, used to monitor and control the temperature and pressure inside the reaction kettle body in real time, and control the booster pump to adjust the pressure inside the reaction kettle body;

[0046] Multi-layer fidelity sampling and transfer system, including a plurality of fidelity sampling tubes 10, a control valve 12 at the end of the sampling system, a connecting pipe 13, a first control valve 8 of the sampling system, a second control valve 9 of the sampling system and a plurality of reaction fluid samplers 20. The fidelity sampling tubes 10 are connected to the reaction kettle body 3 through the first control valve 8 and the second control valve 9 of the sampling system. The control valve 12 at the end of the sampling system is connected to a vacuum pump through the connecting pipe 13, used to extract the air existing 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 material of the heating layer includes metal materials and non-metal materials. Among them, the metal materials include stainless steel, Hastelloy and titanium alloy, etc., and the non-metal materials include silicon carbide (SiC) ceramics and quartz glass. The implementation form of the heating layer includes a fluid circulation heating layer or electromagnetic induction heating.

[0048] Among them, the specific implementation method of the fluid circulation heating layer structure: circulate high-temperature heat-conducting oil / steam in the reaction kettle jacket or coil, and control the temperature through an external heat exchanger. The specific implementation method of the electromagnetic induction heating structure: wind an induction coil outside the reaction kettle, and use the eddy current effect to heat the reaction kettle body.

[0049] Among them, in the above technical solution, a carbon dioxide inlet 1 is provided at the top of the reaction kettle body 3, and the carbon dioxide inlet 1 is connected to the carbon dioxide booster pump 15 through a pipeline, used to inject the pressurized carbon dioxide gas into the injection hole 5 in the middle of the core;

[0050] As Figure 1 shown, a reaction background fluid sampling tube 71 is arranged inside the reaction kettle body 3, and the reaction background fluid sampling tube 71 is located below the formation water liquid level, used to obtain the reaction background fluid;

[0051] A pressure relief valve 14 is arranged at the top of the reaction kettle body 3, and the pressure relief valve 14 is communicated with the inside of the reaction kettle body 3 through a pipeline. The pressure relief valve 14 is used to release the pressure inside the kettle after the experiment or in case of 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. The distance between the end of the central injection hole 5 and the end of the core is equal to the diameter of the central injection hole 5. A section of the core that is not penetrated by the central injection hole 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, and the core side injection holes 6 simulate the lateral migration channel 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, and the diameter of the core side injection holes 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, and the distance between adjacent injection holes 6 along the core side is equal to twice the diameter of the core side injection holes 6, which are 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 respectively sealed with the end control valve of the sampling system and the vacuum pump 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, so as to obtain the reaction fluid in different layers of the core in real time 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 of which is connected to the reactor body 3 via 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 a connecting tube 13 via a sampling system end control valve 12 for extracting and transferring reaction fluids, and the fidelity sampling tube 10 is connected to the reactor body 3 via a connecting screw 11.

[0058] Furthermore, in the above technical solution, the carbon dioxide booster pump 15 is located downstream of the carbon dioxide gas tank 19, and is used to increase the gas pressure output from the carbon dioxide gas tank 19, and control and calculate the injection flow rate 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 reaction kettle 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 reaction kettle body 3, and the reaction fluid sampler 20 is used to store and transfer the reaction fluid in the fidelity sampling tube 10.

[0060] As Figure 2 shown, it is a schematic diagram of the second embodiment of the present invention, which is realized through the following technical solution: Under the conditions of simulating different pressures and temperatures, without changing the temperature and pressure conditions inside the reaction kettle, the mineralization reaction fluid of different layers of the core during the carbon dioxide injection process is obtained in a fidelity manner, simulating the process of dissolving the original minerals and causing changes in the concentrations of anions and cations in the solution during the carbon dioxide-water-rock coupling reaction process under actual formation conditions, and revealing the carbon dioxide mineralization and sequestration process from the perspective of geochemistry.

[0061] A device for obtaining the reaction fluid of the whole process of high-temperature and high-pressure carbon dioxide mineralization and sequestration of different layers of the core in a fidelity manner mainly includes a high-pressure carbon dioxide gas supply device, a high-temperature and high-pressure reaction kettle, 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: Process the core sample. Drill a hole with a diameter of 1 cm along the central axis of the core, but the length is less than 1 cm of the core length, and the drilling stops 1 cm from the end of the core to ensure that there is a 1-cm plug at the bottom of the core. This hole is used to simulate the injection channel of carbon dioxide. Drill holes with a diameter of 1 cm at intervals of 2 cm along the side of the core perpendicular to the drilling direction, that is, the side injection holes of the core.

[0064] 2. Configure formation water: According to the geological conditions of the research area, configure sufficient formation water according to the geochemical composition of the formation water obtained from the previous drilling. The formation water is configured using analytical pure reagents and deionized water.

[0065] 3. Place the samples: First, clean the components inside the reaction kettle with deionized water, then clean the reaction kettle with the formation water prepared in step 2. Then place the core in the high-temperature and high-pressure reaction kettle, and at the same time place the carbon dioxide injection catheter into the injection hole in the middle of the core. Place 5 reaction fluid sampling tubes inside the cores in the side holes of the cores for real-time acquisition of the reaction fluid during the reaction. After the samples are placed, add the prepared formation water to the reaction kettle. 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 and high-pressure reaction kettle cover and tighten all the screws.

[0066] 4. Check the airtightness: Connect the carbon dioxide gas cylinder to the carbon dioxide booster pump and the gas flowmeter, and then connect them to the carbon dioxide inlet at the top of the reaction kettle. Check the valves of the carbon dioxide gas cylinder, the inlet and outlet valves of the booster device, and turn the pressure regulating valve counterclockwise to the end. Check that the 6 real-time sampling system valves are closed.

[0067] 5. Start the experiment: First, open the carbon dioxide gas tank, open the valve of the gas flowmeter, open the inlet valve of the gas booster device and the driving gas inlet valve, so that the carbon dioxide is increased from the pressure of 5 MPa output by the gas cylinder to the required pressure in the booster device, and open the valve to let the pressurized carbon dioxide gas enter the kettle body. Since the temperature inside the kettle exceeds the supercritical temperature, when the gas enters the reaction kettle, it will instantly become a supercritical state, which conforms to the carbon dioxide state of the experimental simulation. Continuously inject carbon dioxide for a period of time, observe the pressure change inside the kettle, set the stable pressure value inside 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 inside the reaction kettle.

[0068] Software configuration of the control terminal:

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

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

[0071] Automatic control program: Write a LabVIEW program to automatically adjust the heating system and the pressurizing system according to the collected temperature and pressure data to ensure the stability of the experimental conditions. For example, when the temperature inside the kettle is lower than the set value, increase the heating power; when the pressure inside the kettle is lower than the set value, increase the carbon dioxide injection pressure.

[0072] 6. Obtaining fluid samples with guaranteed authenticity: After the reaction has proceeded for 8 hours, obtain the reaction fluid. First, open the control valve at the end of the sampling system at the end of the sampler, connect the sampling port through a vacuum pump, evacuate the sampler, wait for 5 minutes. After the evacuation is complete, close the control valve at the end of the sampling system. Then, sequentially open the two control valves at the connection end between the sampler and the reaction kettle, namely the first sampling system control valve and the second sampling system control valve, to allow the reaction fluid to enter the sampling tube with guaranteed authenticity. After the fluid enters the sampling tube with guaranteed authenticity, wait for 2 - 3 minutes, and then sequentially close the two control valves at the reaction kettle connection end. Open the control valve at the end of the sampling system to transfer the reaction fluid to a sampling bottle or experimental test tube for subsequent geochemical tests. Sample the reaction fluid with the sampling tube with guaranteed authenticity in sequence according to this step and conduct subsequent geochemical tests. Since the experimental cycle is generally more than 480 hours, it is necessary to plan the sampling stage, such as at the 8th hour, 18th hour, 28th hour... after the reaction starts. Systematic sampling can conduct full-cycle control and monitoring of the carbon dioxide mineral sequestration process in the core.

[0073] 7. Ending the experiment: After one cycle of the experiment ends, first adjust the temperature until it stabilizes 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 lid, take out the core sample, take out the remaining liquid, and clean the reaction kettle and related samplers with deionized water.

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

[0075] Simulate the high-temperature and high-pressure environment under formation conditions through the high-temperature and high-pressure reaction kettle body and the temperature and pressure monitoring probe. The high-temperature and high-pressure reaction kettle body is made of high-strength corrosion-resistant materials and can withstand experimental conditions of high temperature (up to 200 °C) and high pressure (up to 50 MPa). The temperature and pressure monitoring probe monitors the temperature and pressure in the kettle in real time and transmits the data to the temperature and pressure controller and the control terminal to ensure the stability of the experimental conditions;

[0076] Inject carbon dioxide gas into the injection hole in the middle of the core through the high-pressure carbon dioxide gas supply device, and adjust the injection flow rate and pressure of carbon dioxide through the gas flow meter and the carbon dioxide booster pump. When the temperature in the kettle exceeds the supercritical temperature of carbon dioxide (31.1 °C), the carbon dioxide gas instantly becomes supercritical after entering the reaction kettle, simulating the state of carbon dioxide in the formation;

[0077] Through the cooperation of the core and formation water, truly simulate the carbon dioxide-water-rock coupling reaction under field formation conditions. After the carbon dioxide is injected, it undergoes geochemical reactions with the formation water and rock, dissolving the original minerals and causing changes in the concentrations of anions and cations in the solution;

[0078] Through a multi-layer bit-fidelity sampling and transfer system, the bit-fidelity acquisition and transfer of the reaction fluid are realized. The bit-fidelity sampling tube is connected to the high-temperature and high-pressure reaction kettle body through the first sampling system control valve and the second sampling system control valve, and the reaction fluid is extracted through a vacuum pump and transferred to the bit-fidelity acquisition reaction fluid sampler;

[0079] The experimental data are recorded by the control terminal, and combined with subsequent geochemical tests, the mechanism and process of carbon dioxide mineralization and sequestration are revealed. For example, by analyzing the change of ion concentration in the reaction fluid, the efficiency and potential of carbon dioxide mineralization and sequestration are evaluated.

[0080] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered by the protection scope of the present invention.

Claims

1. A device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity, characterized in that: include: A high-pressure carbon dioxide gas supply device, comprising a carbon dioxide gas tank, a carbon dioxide booster pump and a gas flow meter, wherein 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; A reactor body, used to contain the core and formation water; 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 comprises a plurality of 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 a plurality of reaction fluid samplers. The fidelity sampling tubes are connected to a reaction kettle body via the first sampling system control valve and the second sampling system control valve. The sampling system end control valve is connected to a vacuum pump via a connecting pipe for extracting reaction fluid and transferring it to the reaction fluid sampler.

2. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 1 is characterized in that: The top of the reactor body is provided with a carbon dioxide inlet, which is connected to a gas flow meter through a pipeline and is used to inject pressurized carbon dioxide gas into the injection hole in the middle of the core; A reaction background fluid sampling tube is arranged inside the reactor body, and the reaction background fluid sampling tube is located below the formation water level and is used to obtain the reaction background fluid; A pressure relief valve is provided on the top of the reactor body, and the pressure relief valve is connected to the inside 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 increase the temperature during the reaction process.

3. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 2 is characterized in that: The core is provided with a central injection hole along the central axis for injecting carbon dioxide. The length of the central injection hole is less than the length of the core. The difference between the length of the core and the length of the central injection hole is equal to the diameter of the central injection hole. The distance between the end of the central injection hole and the end of the core is equal to the diameter of the central injection hole. A section of the core that is not penetrated by the central injection hole is retained at the end of the core to simulate the carbon dioxide injection channel.

4. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 3 is characterized in that: A plurality of core side injection holes are provided on the core side, and the core side injection holes 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, and the diameter of the core side injection holes is equal to the diameter of the central injection hole of the core. The core side injection holes are equidistantly distributed along the core side, and the distance between adjacent injection holes along the core side is equal to twice the diameter of the core side injection holes. 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.

5. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 4 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 in 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 in the reactor.

6. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 5 is characterized in that: The two ends of the connecting pipe are provided with quick connectors, which are respectively sealed with the end control valve of the sampling system and the vacuum pump for sample transfer. The interfaces between the connecting pipe and the fidelity sampling tube and the vacuum pump are provided with sealing rings or threaded locking structures.

7. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 6 is characterized in that: The core reaction fluid sampling tube includes a plurality of real-time sampling conduits, which are respectively inserted into 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.

8. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 7 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 a connecting pipe through a sampling system end control valve for extracting and transferring reaction fluids. The fidelity sampling tube is connected to the reactor body through connecting screws.

9. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 8, 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 inlet at the top of the reactor body through a pipeline.

10. The device for obtaining the fluid of the whole process of core high temperature and high pressure mineralization and sealing with high fidelity according to claim 9, 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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