Reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on tubule model

Abstract

The invention discloses a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a slim tube model, and belongs to the technical field of oil and gas reservoir in-situ hydrogen production. The method comprises the experimental process of filling sand into the slim tube model and connecting the slim tube model-based reservoir in-situ carbon storage and hydrogen production effect evaluation device. The method comprises the following steps: debugging instruments and equipment of a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a slim tube model, injecting high-temperature CO2 into the slim tube model, preheating the slim tube model by the high-temperature CO2, heating the slim tube model by electromagnetic waves to prepare hydrogen, collecting the hydrogen, and determining an experiment ending opportunity; a conventional oxygen injection combustion heating mode can be broken through by adopting a high-temperature CO2 injection preheating reservoir and electromagnetic heating reservoir in-situ hydrogen production technology, and negative hydrocarbon gas development can be realized; the in-situ CO2 storage amount and the hydrogen generation amount of the high-temperature CO2 preheating reservoir and the electromagnetic heating reservoir under different factors can be quantitatively obtained, support can be provided for parameter optimization of the technology, and mine field application of the technology is promoted.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-situ hydrogen production in oil and gas reservoirs, and in particular relates to a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary model. Background Art

[0002] Greenhouse gas emissions have led to increasingly severe global climate change issues. "Carbon peak and carbon neutrality" will help reduce greenhouse gas emissions and slow down the pace of global warming. At the same time, the dual carbon policy of "carbon peak and carbon neutrality" has promoted the transformation of green and clean energy and the rapid development of carbon dioxide (CO2) capture, utilization and storage (CCUS) technology. Hydrogen (H2) is considered to be the most promising clean energy in the 21st century. About 95% of hydrogen in the United States is produced by steam methane reforming (SMR) using natural gas and water as raw materials. The disadvantage of this technology is that the carbon dioxide emissions are high, about 9-10kgCO2e / kgH2, which increases the burden of CCUS to reduce the negative impact of greenhouse gas footprint. The integration of SMR and CCUS is a relatively mature technology, and it is a huge challenge to significantly reduce its cost.

[0003] Converting oil and natural gas into clean hydrogen through underground thermal cracking and other methods is a technical solution that is expected to achieve decarbonization of the oil industry by 2050. In-situ hydrogen production in reservoirs can directly generate and extract hydrogen from oil and gas reservoirs, while using downhole hydrogen membrane separators to lock all carbon products underground. Based on the existing infrastructure of oil and gas fields, there is no need to extract, separate, or transport hydrocarbons, which can significantly reduce the cost of hydrogen production. At present, most in-situ hydrogen production technologies in reservoirs are to inject air into coal reservoirs, heavy oil reservoirs, or abandoned oil reservoirs for ignition, that is, to produce hydrogen using the in-situ combustion gasification (ISCG) method.

[0004] Chinese patent "202210287852.8" discloses an air thermochemical oil and gas in-situ hydrogen production and reforming simulation system, which discloses an air thermochemical oil and gas in-situ hydrogen production and reforming simulation system. This technology can simulate the in-situ pyrolysis hydrogen production process of the reservoir and detect the temperature and product distribution in the simulated formation, which is of great significance for understanding the production mechanism and field application of in-situ hydrogen production in oil and gas reservoirs. The invention takes into account the elements of heating the reservoir to produce hydrogen. However, the existing system has the following problems:

[0005] (1) This technology does not realize high-temperature oxidative cracking to produce hydrogen, cannot avoid the generation of CO2, and cannot realize the utilization of generated CO2;

[0006] (2) The system does not realize the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist in electromagnetic heating for in-situ carbon storage and hydrogen production.

[0007] Chinese patent "202210955852.0" discloses a method for in-situ hydrogen production near the wellbore zone by using downhole electric heating. The method heats the reservoir near the wellbore zone by setting an electric heating device and a temperature monitoring device downhole. When the natural gas in the reservoir passes through the formation near the wellbore zone of the production well, it mixes with the water vapor generated in situ under high temperature conditions, and a hydrogen production reaction occurs under the action of nanocatalysts on the rock surface, producing outputs including hydrogen and other components mainly composed of carbon dioxide. Finally, the produced hydrogen and other components are separated and the other components are injected back into the formation through adjacent injection wells. However, this method has the following shortcomings:

[0008] (1) The technical means of the method described above is still to heat and decompose organic matter with water vapor, which cannot avoid the generation of CO2 gas. In addition, the technology cannot achieve in-situ storage of associated gases such as CO2 through a filtration membrane. Even if reinjection is performed, the cost is increased, and the utilization of CO2 cannot be achieved.

[0009] (2) This technical method does not realize the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist in electromagnetic heating for in-situ carbon storage and hydrogen production.

[0010] To address the above issues, we proposed a device and method for evaluating the in-situ carbon storage and hydrogen production effects of reservoirs based on a capillary model. Summary of the invention

[0011] The purpose of the present invention is to address the shortcomings of the prior art and provide a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary model, which solves the problem that the existing system cannot achieve high-temperature oxidative cracking hydrogen production to avoid the generation of CO2, and cannot achieve the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist in electromagnetic heating for in-situ carbon storage and hydrogen production.

[0012] The existing system does not realize high-temperature oxidative cracking hydrogen production to avoid the generation of CO2, nor can it realize the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist electromagnetic heating to store carbon and produce hydrogen in situ. In view of the above problems, we propose a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary model, aiming to establish an indoor experimental process and method for evaluating the feasibility and advancement of the technology. The reason for choosing the capillary model is that it relies on its long length to achieve the real simulation of high-temperature CO2 from the injection well to the H2 production well section in the real reservoir. The in-situ hydrogen production technology of injecting high-temperature CO2 to preheat the reservoir and cooperating with electromagnetic heating reservoir in the present invention can break through the conventional oxygen injection combustion heating method and realize the development of negative carbonized hydrogen. The feasibility and advancement of the technology can also be verified through indoor experiments; the present invention can quantitatively obtain the in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir and electromagnetic heating reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.), which can provide support for the parameter optimization of the technology and promote its mine application.

[0013] The present invention is implemented by a method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model, the method comprising:

[0014] S10, sand filling of capillary model;

[0015] S20, connecting the experimental process of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, and debugging the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model;

[0016] When debugging the instruments of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, the experimental process is connected based on the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, the instruments in the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model are debugged, and then the first valve, the second valve and the third valve are closed, and the heating device is turned on to heat the carbon dioxide in the piston container to a preset temperature.

[0017] S30, injecting high temperature CO2 into the capillary model to preheat the capillary model;

[0018] When injecting high-temperature CO2 into the capillary model, open the first valve and the third valve, and then turn on the ISCO injection pump. The ISCO injection pump injects the high-temperature CO2 in the piston container into the capillary model, monitors the temperature of the infrared thermometer in real time, and closes the ISCO pump and the third valve when the pressure on the pressure gauge reaches the preset pressure.

[0019] S40, electromagnetic wave heating capillary model to produce hydrogen;

[0020] S50, collecting hydrogen and determining the end time of the experiment;

[0021] S60, repeat S30-S50 until the hydrogen flow rate drops to 0, end the experiment, and close the equipment to clean up the experimental process.

[0022] On the other hand, the present invention also provides a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model, the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model comprising:

[0023] Control and monitoring module;

[0024] An electromagnetic wave generating chamber, wherein an electromagnetic wave generator is installed in the electromagnetic wave generating chamber, the electromagnetic wave generator is electrically connected to the control and monitoring module through a control connection, and a waveguide is installed on one side of the electromagnetic wave generating chamber, the waveguide is used to propagate the electromagnetic wave generated by the electromagnetic wave generator;

[0025] A simulated reaction chamber, wherein a capillary model is fixedly installed in the simulated reaction chamber, the capillary model is filled with saturated oil sand, and a second valve is installed on the top of the capillary model, and the second valve is used to control the opening and closing of the capillary model;

[0026] A hydrogen filter membrane is detachably installed in the capillary model, and the hydrogen filter membrane is used to filter the generated hydrogen;

[0027] A gas pipeline connected to the capillary model, wherein a gas flow meter is installed in the gas pipeline, and the gas flow meter is used to record the flow rate of the gas;

[0028] A hydrogen collecting bottle, which is connected to the gas pipeline and is used to collect the generated hydrogen;

[0029] A first valve, wherein the first valve is connected to one end of the capillary tube model, and an end of the first valve away from the capillary tube model is connected to a pressure gauge, and the pressure gauge is electrically connected to the control and monitoring module through a control wiring;

[0030] A sealing gasket is installed at the bottom of the simulation reaction chamber, and the sealing gasket is sleeved on the outer side of the lower end of the capillary model to seal and protect the capillary model;

[0031] A third valve is arranged on one side of the pressure gauge, the third valve is connected to the pressure gauge, and a side of the third valve away from the pressure gauge is connected to a piston container;

[0032] A piston container, the piston container is used to contain carbon dioxide gas, one side of the piston container is connected to the ISCO injection pump, and the piston container is fixedly installed in the heating device;

[0033] The infrared thermometer is fixedly installed on the side wall of the simulation reaction chamber. The infrared thermometer is used to measure the temperature of the capillary model in real time.

[0034] The method for filling sand into a capillary model comprises:

[0035] S101, obtaining the natural core or outcrop of the target reservoir and the development status of the natural core or outcrop, wherein the development status of the natural core and outcrop of the target reservoir includes water content and oil saturation;

[0036] S102, the natural core of the target reservoir is subjected to oil washing, drying, water saturation, oil saturation and mining treatment to restore the actual development state of the target reservoir, and the developed core is crushed and filled into a capillary model;

[0037] S103, the capillary model is deoxidized using an inert gas.

[0038] The capillary model is a spirally coiled metal pipe with a length greater than 18 m, a pressure resistance greater than 60 MPa, and a temperature resistance greater than 600° C.

[0039] The method for preparing hydrogen by electromagnetic wave heating a capillary model comprises:

[0040] The electromagnetic wave generator is turned on. The electromagnetic wave generated by the electromagnetic wave generator is transmitted to the simulation reaction chamber through the electromagnetic wave generating chamber and the waveguide tube and acts on the capillary model to continue heating it. Then the second valve is opened, the readings of the infrared thermometer and the pressure gauge are monitored, and the electromagnetic wave generator is turned off after the temperature reaches the preset temperature.

[0041] When collecting hydrogen and determining the end time of the experiment, the gas in the capillary model is filtered through a hydrogen filter membrane to remove other gases to obtain a pure hydrogen flow, and the gas flow rate is recorded by a gas flow meter. Finally, the hydrogen is collected in a hydrogen collection bottle, and the second valve is closed when the value monitored by the gas flow meter drops to a preset threshold.

[0042] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0043] The present invention adopts the in-situ hydrogen production technology of injecting high-temperature CO2 to preheat the reservoir in coordination with electromagnetic heating reservoir, which can break through the conventional oxygen injection combustion heating method and realize the development of negative carbonized hydrogen. The feasibility and advancement of the technology can also be verified through indoor experiments; the present invention can quantitatively obtain the in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir in coordination with electromagnetic heating reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.), which can provide support for the parameter optimization of the technology and promote its application in mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the implementation flow of the method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model provided by the present invention.

[0045] Figure 2 A schematic diagram of the temperature and hydrogen production rate curve of Example 1 is shown.

[0046] Figure 3 A schematic diagram of the temperature and hydrogen production rate curve of Example 2 is shown.

[0047] Figure 4 A schematic diagram of the temperature and hydrogen production rate curve of Example 3 is shown.

[0048] Figure 5 It is a structural schematic diagram of a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model provided by the present invention.

[0049] In the figure: 1-control and monitoring module, 2-electromagnetic wave generating chamber, 3-electromagnetic wave generator, 4-waveguide tube, 5-simulated reaction chamber, 6-thin tube model, 7-sealing gasket, 8-hydrogen filter membrane, 9-control wiring, 10-first valve, 11-pressure gauge, 12-second valve, 13-third valve, 14-infrared thermometer, 15-gas flow meter, 16-gas pipeline, 17-hydrogen collection bottle, 18-piston container, 19-heating device, 20-ISCO injection pump. DETAILED DESCRIPTION

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0051] The existing system does not realize high-temperature oxidative cracking hydrogen production to avoid the generation of CO2, nor can it realize the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist electromagnetic heating to store carbon and produce hydrogen in situ. In view of the above problems, we propose a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary model, aiming to establish an indoor experimental process and method for evaluating the feasibility and advancement of the technology. The reason for selecting the capillary model 6 is that it relies on its longer length to achieve a real simulation of high-temperature CO2 from the injection well to the H2 production well section in the real reservoir. The in-situ hydrogen production technology of injecting high-temperature CO2 to preheat the reservoir and cooperating with electromagnetic heating reservoir in the present invention can break through the conventional oxygen injection combustion heating method and realize the development of negative carbonized hydrogen. The feasibility and advancement of the technology can also be verified through indoor experiments; the present invention can quantitatively obtain the in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir and electromagnetic heating reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.), which can provide support for the parameter optimization of the technology and promote its mine application.

[0052] It should be noted that the present invention is applicable to any conventional or unconventional oil, gas and coal reservoirs, such as conventional sandstone reservoirs, oil shale reservoirs and heavy oil reservoirs.

[0053] The embodiment of the present invention provides a method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model. Figure 1 The schematic diagram of the implementation process of the reservoir in-situ carbon storage and hydrogen production effect evaluation method based on the capillary model is shown. The reservoir in-situ carbon storage and hydrogen production effect evaluation method based on the capillary model specifically includes:

[0054] S10, thin tube model 6 filled with sand;

[0055] In this embodiment, the method of filling the capillary model 6 with sand includes:

[0056] S101, obtaining the natural core or outcrop of the target reservoir and the development status of the natural core or outcrop, wherein the development status of the natural core and outcrop of the target reservoir includes water content and oil saturation;

[0057] S102, the natural core of the target reservoir is subjected to oil washing, drying, water saturation, oil saturation and mining treatment to restore the actual development state of the target reservoir, and the developed core is crushed and filled into a capillary model 6;

[0058] S103, the capillary model 6 is subjected to deoxidation treatment using an inert gas.

[0059] It should be noted that when the capillary model 6 is deoxidized by an inert gas, the inert gas may be argon, nitrogen, or helium, and the capillary model 6 is a spirally coiled metal pipe having a length greater than 18 m, a pressure resistance greater than 60 MPa, and a temperature resistance greater than 600°C. The inner diameter of the capillary model 6 is generally 6 mm, and may be 5-10 mm, but is not completely limited. The wall thickness is generally not less than 3 mm. The capillary model 6 may be made of stainless steel, and the length is generally not less than 15 m, and may be 15-20 m. The number of turns depends on the diameter of the coil.

[0060] Meanwhile, a catalyst may be added during the sand filling process to reduce the reaction temperature (including but not limited to iron ions, SiC, etc.).

[0061] S20, connecting the experimental process of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, and debugging the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model;

[0062] When debugging the instruments of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, the experimental process is connected based on the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, the instruments in the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model are debugged, and then the first valve 10, the second valve 12 and the third valve 13 are closed, and the heating device 19 is turned on to heat the carbon dioxide in the piston container 18 to a preset temperature.

[0063] S30, injecting high temperature CO2 into the capillary model 6, and the high temperature CO2 preheats the capillary model 6;

[0064] It should be noted that when high-temperature CO2 is injected into the capillary model 6, the first valve 10 and the third valve 13 are opened, and then the ISCO injection pump 20 is turned on. The ISCO injection pump 20 injects the high-temperature CO2 in the piston container 18 into the capillary model 6, and the temperature of the infrared thermometer 14 is monitored in real time. When the pressure of the pressure gauge 11 reaches the preset pressure, the ISCO pump and the third valve 13 are closed.

[0065] S40, electromagnetic wave heating the capillary model 6 to prepare hydrogen;

[0066] The method for preparing hydrogen by electromagnetic wave heating the capillary model 6 comprises:

[0067] The electromagnetic wave generator 3 is turned on. The electromagnetic wave generated by the electromagnetic wave generator 3 is transmitted to the simulation reaction chamber 5 through the electromagnetic wave generating chamber 2 and the waveguide tube 4 and acts on the capillary model 6 to continue heating it. Then the second valve 12 is opened, the readings of the infrared thermometer 14 and the pressure gauge 11 are monitored, and the electromagnetic wave generator 3 is turned off after the temperature reaches the preset temperature.

[0068] Among them, the preset temperature can be set to a multiple of the hydrogen generation temperature, such as 1.2 times the hydrogen generation temperature, and the hydrogen generation temperature is related to the lithology and physical properties of the target reservoir.

[0069] S50, collecting hydrogen and determining the end time of the experiment;

[0070] When collecting hydrogen and determining the end time of the experiment, the gas in the capillary model 6 is filtered out by the hydrogen filter membrane 8 to remove other gases to obtain a pure hydrogen flow, and the gas flow rate is recorded by the gas flow meter 15. Finally, the hydrogen is collected in the hydrogen collection bottle 17, and the second valve 12 is closed when the monitoring value of the gas flow meter 15 drops to a preset threshold.

[0071] S60, repeat S30-S50 until the hydrogen flow rate drops to 0, end the experiment, and close the equipment to clean up the experimental process.

[0072] It should be noted that the experiment is terminated after the hydrogen flow in the capillary model 6 in step S50 is reduced to a certain level, the pumped volume of the ISCO pump is recorded as the CO2 storage volume, all equipment is turned off, and the device is disassembled and cleaned after cooling.

[0073] In this embodiment, a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model is also provided. Figure 5 As shown, the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model includes:

[0074] Control and monitoring module 1;

[0075] It should be noted that the control and monitoring module 1 can be a monitoring computer system.

[0076] An electromagnetic wave generating chamber 2, wherein an electromagnetic wave generator 3 is installed in the electromagnetic wave generating chamber 2, and the electromagnetic wave generator 3 is electrically connected to the control and monitoring module 1 through a control connection 9, and a waveguide 4 is installed on one side of the electromagnetic wave generating chamber 2, and the waveguide 4 is used to propagate the electromagnetic wave generated by the electromagnetic wave generator 3;

[0077] It should be noted that the electromagnetic wave generator 3 includes two types: a magnetron and a solid generator. The solid generator is an upgraded version with higher power and frequency. However, in the application context of electromagnetic wave heating in this patent, an excessively high frequency is not required, and magnetrons are more mature for microwave heating (such as microwave ovens). The operating frequency of the microwave generator is 3-5 GHz, and the maximum power is not less than 3 kW.

[0078] A simulated reaction chamber 5, wherein a capillary model 6 is fixedly installed in the simulated reaction chamber 5, the capillary model 6 is filled with saturated oil sand, and a second valve 12 is installed on the top of the capillary model 6, and the second valve 12 is used to control the opening and closing of the capillary model 6;

[0079] A hydrogen filter membrane 8 is detachably installed in the capillary model 6, and the hydrogen filter membrane 8 is used to filter the generated hydrogen;

[0080] A gas pipeline 16 communicated with the capillary model 6, wherein a gas flow meter 15 is installed in the gas pipeline 16, and the gas flow meter 15 is used to record the flow rate of the gas;

[0081] A hydrogen collecting bottle 17 is connected to the gas pipeline 16 and is used to collect the generated hydrogen.

[0082] A first valve 10, wherein the first valve 10 is connected to one end of the capillary model 6, and an end of the first valve 10 away from the capillary model 6 is connected to a pressure gauge 11, and the pressure gauge 11 is electrically connected to the control and monitoring module 1 through the control connection 9;

[0083] A sealing gasket 7 is installed at the bottom of the simulation reaction chamber 5. The sealing gasket 7 is sleeved on the outer side of the lower end of the capillary model 6 to seal and protect the capillary model 6;

[0084] A third valve 13 is disposed on one side of the pressure gauge 11. The third valve 13 is in communication with the pressure gauge 11. A side of the third valve 13 away from the pressure gauge 11 is in communication with a piston container 18.

[0085] A piston container 18, the piston container 18 is used to contain carbon dioxide gas, one side of the piston container 18 is connected to the ISCO injection pump 20, and the piston container 18 is fixedly installed in the heating device 19;

[0086] In this embodiment, the heating device 19 is a heating sleeve heating device, and the parameters of the heating device 19 are as follows: the heating temperature range is ≤800° C.; the thermal conductivity coefficient of the insulation layer is 0.042 W / m·K.

[0087] The infrared thermometer 14 is fixedly installed on the side wall of the simulation reaction chamber 5 , and is used to measure the temperature of the capillary model 6 in real time.

[0088] Example 1

[0089] This embodiment provides a method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model. Figure 2 A schematic diagram of the temperature and hydrogen production rate curve of Example 1 is shown.

[0090] S10, obtaining the lithology of the natural shale in the Ordos Basin, and developing it with CO2 until the remaining oil saturation is 50% after oil washing, drying, saturation with water, saturation with oil, etc., crushing the core and filling the capillary model 6 (the capillary model 6 has a length of 18m), and after the capillary model 6 is filled, deoxygenation treatment is performed with inert gas such as argon;

[0091] S20, according to the connection experiment flow of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, debug the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, close the first valve 10, the second valve 12 and the third valve 13, and turn on the heating device 19 to heat the carbon dioxide in the piston container 18 to 200° C.;

[0092] S30, opening the first valve 10 and the third valve 13, and starting the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the capillary model 6, monitoring the temperature of the infrared thermometer 14 in real time, and closing the ISCO pump and the third valve 13 when the pressure of the pressure gauge 11 reaches 15 MPa;

[0093] S40, the electromagnetic wave generator 3 is turned on, and the electromagnetic wave generated by the electromagnetic wave generator 3 is transmitted to the simulation reaction chamber 5 through the electromagnetic wave generating chamber 2 and the waveguide 4 and acts on the capillary model 6 to continue heating it, and then the second valve 12 is opened, and the readings of the infrared thermometer 14 and the pressure gauge 11 are monitored, and the electromagnetic wave generator 3 is turned off after the temperature reaches 500°C;

[0094] S50, the gas in the capillary model 6 is filtered out by the hydrogen filter membrane 8 to obtain a pure hydrogen flow, and the gas flow rate is recorded by the gas flow meter 15, and the hydrogen is finally collected in the hydrogen collection bottle 17. When the value monitored by the gas flow meter 15 decreases to 0, the second valve 12 is closed;

[0095] S60, repeat S30-S50 until the hydrogen flow in the capillary model 6 in step S50 is reduced to 0, and the experiment is terminated. The pumped volume of the ISCO pump is recorded as the CO2 storage volume. All equipment is turned off, and the device is disassembled and cleaned after cooling.

[0096] Example 2

[0097] This embodiment provides a method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model. Figure 3 A schematic diagram of the temperature and hydrogen production rate curve of Example 2 is shown.

[0098] S10, obtaining the lithology of the natural shale in the Ordos Basin, and developing it with CO2 until the remaining oil saturation is 50% after oil washing, drying, saturation with water, saturation with oil, etc., crushing the core and filling it with SiC in a mass ratio of 9:1 into a capillary model 6 (the capillary model 6 is 18 m in length), and after the capillary model 6 is filled, deoxidation treatment is performed using an inert gas such as argon;

[0099] S20, according to the connection experiment flow of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, debug the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, close the first valve 10, the second valve 12 and the third valve 13, and turn on the heating device 19 to heat the carbon dioxide in the piston container 18 to 200° C.;

[0100] S30, opening the first valve 10 and the third valve 13, and starting the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the capillary model 6, monitoring the temperature of the infrared thermometer 14 in real time, and closing the ISCO pump and the third valve 13 when the pressure of the pressure gauge 11 reaches 15 MPa;

[0101] S40, the electromagnetic wave generator 3 is turned on, and the electromagnetic wave generated by the electromagnetic wave generator 3 is transmitted to the simulation reaction chamber 5 through the electromagnetic wave generating chamber 2 and the waveguide 4 and acts on the capillary model 6 to continue heating it, and then the second valve 12 is opened, and the readings of the infrared thermometer 14 and the pressure gauge 11 are monitored, and the electromagnetic wave generator 3 is turned off after the temperature reaches 500°C;

[0102] S50, the gas in the capillary model 6 is filtered out by the hydrogen filter membrane 8 to obtain a pure hydrogen flow, and the gas flow rate is recorded by the gas flow meter 15, and the hydrogen is finally collected in the hydrogen collection bottle 17. When the value monitored by the gas flow meter 15 decreases to 0, the second valve 12 is closed;

[0103] S60, repeat S30-S50 until the hydrogen flow in the capillary model 6 in step S50 is reduced to 0, and the experiment is terminated. The pumped volume of the ISCO pump is recorded as the CO2 storage volume. All equipment is turned off, and the device is disassembled and cleaned after cooling.

[0104] Example 3

[0105] This embodiment provides a method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model. Figure 4 A schematic diagram of the temperature and hydrogen production rate curve of Example 3 is shown.

[0106] S10, obtaining the lithology of the natural shale in the Ordos Basin, and developing it with CO2 until the remaining oil saturation is 30% after oil washing, drying, saturation with water, saturation with oil, etc., crushing the core and filling the capillary model 6 (the capillary model 6 has a length of 18m), and after the capillary model 6 is filled, deoxygenation treatment is performed with inert gas such as argon;

[0107] S20, according to the connection experiment flow of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, debug the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, close the first valve 10, the second valve 12 and the third valve 13, and turn on the heating device 19 to heat the carbon dioxide in the piston container 18 to 200° C.;

[0108] S30, opening the first valve 10 and the third valve 13, and starting the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the capillary model 6, monitoring the temperature of the infrared thermometer 14 in real time, and closing the ISCO pump and the third valve 13 when the pressure of the pressure gauge 11 reaches 15 MPa;

[0109] S40, the electromagnetic wave generator 3 is turned on, and the electromagnetic wave generated by the electromagnetic wave generator 3 is transmitted to the simulation reaction chamber 5 through the electromagnetic wave generating chamber 2 and the waveguide 4 and acts on the capillary model 6 to continue heating it, and then the second valve 12 is opened, and the readings of the infrared thermometer 14 and the pressure gauge 11 are monitored, and the electromagnetic wave generator 3 is turned off after the temperature reaches 500°C;

[0110] S50, the gas in the capillary model 6 is filtered out by the hydrogen filter membrane 8 to obtain a pure hydrogen flow, and the gas flow rate is recorded by the gas flow meter 15, and the hydrogen is finally collected in the hydrogen collection bottle 17. When the value monitored by the gas flow meter 15 decreases to 0, the second valve 12 is closed;

[0111] S60, repeat S30-S50 until the hydrogen flow in the capillary model 6 in step S50 is reduced to 0, and the experiment is terminated. The pumped volume of the ISCO pump is recorded as the CO2 storage volume. All equipment is turned off, and the device is disassembled and cleaned after cooling.

[0112] Result analysis:

[0113] Examples 1-3 compare the effect of adding SiC catalyst on hydrogen production and the effect of oil saturation on hydrogen production. It can be found that the results of the three groups of experiments can preheat the model to about 150°C during the injection of high-temperature CO2. Thereafter, the model quickly heats up to 500°C under the action of electromagnetic heating, and hydrogen begins to be produced during this period. By comparing Examples 1 and 2, it can be seen that after adding SiC, the time to start hydrogen production is postponed and the temperature is increased, but the maximum hydrogen production rate is significantly improved; by comparing Examples 1 and 3, it can be seen that the oil saturation is reduced, the time and temperature to start hydrogen production remain basically unchanged, but the maximum hydrogen production rate is reduced. The experimental parameters are summarized in Table 1.

[0114] Table 1 Comparison of key parameters of the embodiments

[0115]

[0116]

[0117] Table 1 shows that all three groups of experiments can effectively produce hydrogen and store CO2, verifying the feasibility and advancement of the technology. Increasing the organic matter content in the reservoir and adding catalysts can effectively increase the hydrogen production rate.

[0118] In summary, the present invention provides an evaluation device and method for in-situ carbon storage and hydrogen production in a reservoir based on a capillary model. The present invention adopts an in-situ hydrogen production technology of injecting high-temperature CO2 to preheat the reservoir in coordination with electromagnetic heating reservoir, which can break through the conventional oxygen injection combustion heating method and realize negative carbonization hydrogen development. The feasibility and advancement of the technology can also be verified through indoor experiments; the present invention can quantitatively obtain the in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir in coordination with electromagnetic heating reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.), which can provide support for the parameter optimization of the technology and promote its application in mines.

[0119] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0120] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model, characterized in that: The reservoir in-situ carbon storage and hydrogen production effect evaluation method based on the capillary model includes: S10, sand filling of capillary model; S20, connecting the experimental process of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model, and debugging the instruments and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model; S30, injecting high temperature CO2 into the capillary model to preheat the capillary model; S40, electromagnetic wave heating capillary model to produce hydrogen; S50, collecting hydrogen and determining the end time of the experiment; S60, repeat S30-S50 until the hydrogen flow rate drops to 0, end the experiment, and close the equipment to clean up the experimental process.

2. The method for evaluating the in-situ carbon storage and hydrogen production effect of a reservoir based on a capillary model according to claim 1, characterized in that: When debugging the instruments of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, the experimental process is connected based on the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, the instruments in the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model are debugged, and then the first valve, the second valve and the third valve are closed, and the heating device is turned on to heat the carbon dioxide in the piston container to a preset temperature.

3. A reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary tube model, used to implement the reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a capillary tube model as claimed in claim 1, characterized in that: The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model comprises: Control and monitoring module; An electromagnetic wave generating chamber, wherein an electromagnetic wave generator is installed in the electromagnetic wave generating chamber, the electromagnetic wave generator is electrically connected to the control and monitoring module through a control connection, and a waveguide is installed on one side of the electromagnetic wave generating chamber, the waveguide is used to propagate the electromagnetic wave generated by the electromagnetic wave generator; A simulated reaction chamber, wherein a capillary model is fixedly installed in the simulated reaction chamber, the capillary model is filled with saturated oil sand, and a second valve is installed on the top of the capillary model, and the second valve is used to control the opening and closing of the capillary model; A hydrogen filter membrane is detachably installed in the capillary model, and the hydrogen filter membrane is used to filter the generated hydrogen; A gas pipeline connected to the capillary model, wherein a gas flow meter is installed in the gas pipeline, and the gas flow meter is used to record the flow rate of the gas; A hydrogen collecting bottle is connected to the gas pipeline and is used to collect the generated hydrogen.

4. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 3, characterized in that: The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model also includes: A first valve, wherein the first valve is connected to one end of the capillary tube model, and an end of the first valve away from the capillary tube model is connected to a pressure gauge, and the pressure gauge is electrically connected to the control and monitoring module through a control wiring; A sealing gasket is installed at the bottom of the simulation reaction chamber, and the sealing gasket is sleeved on the outer side of the lower end of the capillary model to seal and protect the capillary model; A third valve is arranged on one side of the pressure gauge, the third valve is connected to the pressure gauge, and a side of the third valve away from the pressure gauge is connected to a piston container; A piston container, the piston container is used to contain carbon dioxide gas, one side of the piston container is connected to the ISCO injection pump, and the piston container is fixedly installed in the heating device; The infrared thermometer is fixedly installed on the side wall of the simulation reaction chamber. The infrared thermometer is used to measure the temperature of the capillary model in real time.

5. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 4, characterized in that: The method for filling sand into a capillary model comprises: S101, obtaining the natural core or outcrop of the target reservoir and the development status of the natural core or outcrop, wherein the development status of the natural core and outcrop of the target reservoir includes water content and oil saturation; S102, the natural core of the target reservoir is subjected to oil washing, drying, water saturation, oil saturation and mining treatment to restore the actual development state of the target reservoir, and the developed core is crushed and filled into a capillary model; S103, the capillary model is deoxidized using an inert gas.

6. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 4, characterized in that: The capillary model is a spirally coiled metal pipe with a length greater than 15 m, a pressure resistance greater than 60 MPa, and a temperature resistance greater than 600° C.

7. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 5, characterized in that: When injecting high-temperature CO2 into the capillary model, open the first valve and the third valve, and then turn on the ISCO injection pump. The ISCO injection pump injects the high-temperature CO2 in the piston container into the capillary model, monitors the temperature of the infrared thermometer in real time, and closes the ISCO pump and the third valve when the pressure on the pressure gauge reaches the preset pressure.

8. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 7, characterized in that: The method for preparing hydrogen by electromagnetic wave heating a capillary model comprises: The electromagnetic wave generator is turned on. The electromagnetic wave generated by the electromagnetic wave generator is transmitted to the simulation reaction chamber through the electromagnetic wave generating chamber and the waveguide tube and acts on the capillary model to continue heating it. Then the second valve is opened, the readings of the infrared thermometer and the pressure gauge are monitored, and the electromagnetic wave generator is turned off after the temperature reaches the preset temperature.

9. The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary model according to claim 8, characterized in that: When collecting hydrogen and determining the end time of the experiment, the gas in the capillary model is filtered through a hydrogen filter membrane to remove other gases to obtain a pure hydrogen flow, and the gas flow rate is recorded by a gas flow meter. Finally, the hydrogen is collected in a hydrogen collection bottle, and the second valve is closed when the value monitored by the gas flow meter drops to a preset threshold.

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