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

Abstract

The application discloses a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary tube model, and belongs to the technical field of in-situ hydrogen production of oil and gas reservoirs. The method comprises the following steps: sand filling of a capillary tube model, connection of an experimental process of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, debugging of instrument equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the capillary tube model, injection of high-temperature CO2 into the capillary tube model, preheating of the capillary tube model by the high-temperature CO2, preparation of hydrogen by electromagnetic wave heating of the capillary tube model, collection of the hydrogen, and determination of the timing of ending the experiment. The in-situ hydrogen production technology of the application, which is characterized by injection of high-temperature CO2 for preheating of a reservoir and cooperation of electromagnetic heating of the reservoir, can break through the conventional oxygen injection combustion heating mode and realize negative carbon hydrogen development. The in-situ CO2 storage amount and the hydrogen production amount of the reservoir preheated by high-temperature CO2 and the reservoir heated by electromagnetic heating under different factors can be quantitatively obtained, which can provide support for parameter optimization of the technology and promote its field application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of in-situ hydrogen production in oil and gas reservoirs, and particularly relates to a device and method for evaluating in-situ carbon storage and hydrogen production effect in reservoirs based on a thin tube model. BACKGROUND

[0002] 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 a downhole hydrogen membrane separator to lock all carbon products underground. Based on the existing infrastructure of oil and gas fields, there is no need for extraction, separation, and transportation of hydrocarbons, which can significantly reduce the cost of hydrogen production. However, current in-situ hydrogen production technologies mostly involve injecting air into coal reservoirs, heavy oil reservoirs, or abandoned oil reservoirs to ignite, i.e., using in-situ combustion gasification (ISCG) to produce hydrogen.

[0003] Chinese patent "202210287852.8" discloses an air thermochemical oil and gas in-situ hydrogen production and modification simulation system. The system can simulate the in-situ pyrolysis hydrogen production process in the reservoir and detect the temperature and product distribution in the simulated formation, which is of great significance for understanding the generation mechanism and field application of in-situ hydrogen production in oil and gas reservoirs. The invention considers the elements of heating the reservoir for hydrogen production. However, the existing system has the following problems:

[0004] (1) The technology does not achieve high-temperature oxidative cracking for hydrogen production, which cannot avoid the generation of CO2 and cannot achieve the utilization of generated CO2.

[0005] (2) The system does not achieve the feasibility of indoor injection of high-temperature CO2 to preheat the reservoir and assist in-situ carbon storage and hydrogen production by electromagnetic heating.

[0006] Chinese patent "202210955852.0" discloses a method for in-situ hydrogen production near the wellbore using downhole electric heating. The method heats the near-wellbore reservoir by setting electric heating devices and temperature monitoring devices downhole. The natural gas in the reservoir mixes with the in-situ generated steam under high-temperature conditions when passing through the near-wellbore formation of the production well. Under the action of the nanometer catalyst on the rock surface, a hydrogen production reaction occurs, producing hydrogen and other component outputs mainly composed of carbon dioxide. Finally, the output hydrogen and other components are separated, and the other components are injected back into the formation through the adjacent injection well. However, the method has the following disadvantages:

[0007] (1) The method still uses organic matter and steam heating decomposition, which cannot avoid the generation of CO2 gas. Moreover, the technology cannot achieve in-situ storage of CO2 and other associated gases through a filter membrane, even if it is injected back, which increases the cost and cannot achieve the utilization of CO2.

[0008] (2) The technical method does not realize the feasibility of in-situ carbon storage and hydrogen production by indoor injection of high-temperature CO2 to preheat the reservoir and assist electromagnetic heating.

[0009] 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 thin tube model. SUMMARY

[0010] The present application aims to solve the problems that the existing system does not realize high-temperature oxidative cracking for hydrogen production to avoid the generation of CO2, and cannot realize the feasibility of in-situ carbon storage and hydrogen production by indoor injection of high-temperature CO2 to preheat the reservoir and assist electromagnetic heating.

[0011] The existing system does not realize high-temperature oxidative cracking for hydrogen production to avoid the generation of CO2, and cannot realize the feasibility of in-situ carbon storage and hydrogen production by indoor injection of high-temperature CO2 to preheat the reservoir and assist electromagnetic heating. 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 thin tube model, which aims to establish an indoor experimental process and method for evaluating the feasibility and advancement of the technology. The reason for choosing a thin tube model is that it can realize the real simulation of high-temperature CO2 from the CO2 injection well to the H2 production well section in the real reservoir due to its longer length. The present application uses the technology of injecting high-temperature CO2 to preheat the reservoir and assist electromagnetic heating for in-situ hydrogen production, which can break through the conventional oxygen injection combustion heating method and realize negative carbon hydrogen development. It can also verify the feasibility and advancement of the technology through indoor experiments. The present application can quantitatively obtain the CO2 storage amount and hydrogen production amount of high-temperature CO2 preheating the reservoir and assisting electromagnetic heating of the reservoir in-situ under different factors (target reservoir characteristics, development stage, preheating temperature, etc.), which can provide support for parameter optimization of the technology and promote its field application.

[0012] The present application is implemented as follows. The reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a thin tube model comprises:

[0013] S10, sand filling of the thin tube model;

[0014] S20, connecting the reservoir in-situ carbon storage and hydrogen production effect evaluation device experimental process based on a thin tube model, and debugging the instrument equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a thin tube model;

[0015] When the instrument and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model are debugged, the instrument and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model are connected with an experimental process, and then the first valve, the second valve and the third valve are closed, and the heating device is opened to heat the carbon dioxide in the piston container to a preset temperature.

[0016] S30, injecting high-temperature CO2 into the capillary model, and preheating the capillary model by the high-temperature CO2;

[0017] When the high-temperature CO2 is injected into the capillary model, the first valve and the third valve are opened, and then the ISCO injection pump is opened, the ISCO injection pump injects the high-temperature CO2 in the piston container into the capillary model, and the temperature of the infrared thermometer is monitored in real time, and when the pressure of the pressure gauge reaches a preset pressure, the ISCO pump and the third valve are closed.

[0018] S40, preparing hydrogen by electromagnetic wave heating of the capillary model;

[0019] S50, collecting hydrogen and determining the timing of ending the experiment;

[0020] S60, repeating S30-S50 until the hydrogen flow is reduced to 0, and then ending the experiment and cleaning the experimental process.

[0021] In another aspect, the present application also provides a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary model, which comprises:

[0022] A control and monitoring module;

[0023] 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 with the control and monitoring module through a control wire, and a waveguide is installed on one side of the electromagnetic wave generating chamber, and the waveguide is used for propagating electromagnetic waves generated by the electromagnetic wave generator;

[0024] A simulation reaction chamber, wherein a capillary model is fixedly installed in the simulation reaction chamber, the capillary model is filled with saturated oil sand, a second valve is installed on the top of the capillary model, and the second valve is used for controlling the opening and closing of the capillary model;

[0025] A hydrogen filtering membrane, which is detachably installed in the capillary model and is used for filtering the generated hydrogen;

[0026] A gas pipeline in communication with the capillary model, wherein a gas flow meter is installed in the gas pipeline, and the gas flow meter is used for recording the flow of gas;

[0027] A hydrogen collection bottle is connected with the gas pipeline and used to collect the generated hydrogen;

[0028] A first valve is connected with one end of the tubular model, and a pressure gauge is connected with the other end of the first valve.

[0029] A sealing ring is installed at the bottom of the simulation reaction chamber, and the sealing ring is sleeved outside the lower end of the tubular model to seal and protect the tubular model.

[0030] A third valve is arranged on one side of the pressure gauge, and the third valve is connected with the pressure gauge.

[0031] A piston container is used to contain carbon dioxide gas, and one side of the piston container is connected with the ISCO injection pump.

[0032] An infrared thermometer is fixedly installed on the side wall of the simulation reaction chamber and used to measure the temperature of the tubular model in real time.

[0033] The method for filling sand in the tubular model comprises the following steps:

[0034] S101, obtaining a target reservoir natural core or outcrop and a natural core or outcrop development status, wherein the target reservoir natural core or outcrop development status comprises water content and oil saturation.

[0035] S102, reducing the actual development state of the target reservoir by washing oil, drying, saturating water, saturating oil and exploitation treatment on the target reservoir natural core, crushing the developed core and filling the tubular model.

[0036] S103, deoxidizing the tubular model by using inert gas.

[0037] The tubular model is a spiral-wound metal pipe with a length greater than 18 m, a pressure resistance greater than 60 MPa and a temperature resistance greater than 600℃.

[0038] The method for preparing hydrogen by heating the tubular model with electromagnetic waves comprises the following steps:

[0039] The electromagnetic wave generator is started, electromagnetic waves generated by the electromagnetic wave generator are propagated to the simulation reaction chamber through the electromagnetic wave generating chamber and the waveguide tube and continue to heat the tubular model, 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 when the temperature reaches the preset temperature.

[0040] The gas in the capillary tube model is filtered through the hydrogen filter membrane to obtain a pure hydrogen stream after filtering other gases, and the flow of the gas is recorded through the gas flow meter, and finally the hydrogen is collected into the hydrogen collection bottle, and the second valve is closed when the monitored value of the gas flow meter reduces to the preset threshold.

[0041] Compared with the prior art, the embodiments of the application have the following beneficial effects:

[0042] The in-situ hydrogen production technology of the high-temperature CO2 preheating reservoir in cooperation with electromagnetic heating of the reservoir can break through the conventional oxygen injection combustion heating mode, and can realize negative carbon hydrogen development. The feasibility and advancement of the technology can also be verified through indoor experiments; the in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir in cooperation with electromagnetic heating of the reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.) can be quantitatively obtained, which can provide support for parameter optimization of the technology and promote its field application. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the implementation process schematic diagram of the reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a capillary tube model provided by the application.

[0044] Figure 2 An embodiment 1 temperature and hydrogen production rate curve schematic diagram is shown.

[0045] Figure 3 An embodiment 2 temperature and hydrogen production rate curve schematic diagram is shown.

[0046] Figure 4 An embodiment 3 temperature and hydrogen production rate curve schematic diagram is shown.

[0047] Figure 5 is the structural schematic diagram of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a capillary tube model provided by the application.

[0048] In the figure: 1-control and monitoring module, 2-electromagnetic wave generation chamber, 3-electromagnetic wave generator, 4-waveguide tube, 5-simulation reaction chamber, 6-capillary tube model, 7-sealing washer, 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

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the application description and the claims and the above description of drawings herein use the term "comprising" and "having" and their any variations thereof, are intended to cover the inclusion not an exclusive inclusion; the application description and the claims and the above description of drawings herein use the terms "first", "second" and the like to distinguish different objects, not to describe a particular order.

[0050] The existing system cannot realize high-temperature oxidative cracking for hydrogen production to avoid the generation of CO2, and cannot realize the feasibility of in-situ carbon storage and hydrogen production by injecting high-temperature CO2 into a reservoir for preheating and auxiliary electromagnetic heating. In view of the above problems, the present application provides a device and method for evaluating the effect of in-situ carbon storage and hydrogen production in a reservoir based on a fine tube model, which aims to establish an indoor experimental process and method for evaluating the feasibility and advancement of the technology. The reason for selecting the fine tube model 6 is that it can realize the real simulation of high-temperature CO2 from the CO2 injection well to the H2 production well section in the real reservoir due to its long length. The in-situ hydrogen production technology by injecting high-temperature CO2 into a reservoir for preheating and auxiliary electromagnetic heating can break through the conventional oxygen injection combustion heating method and realize negative carbon hydrogen development. The feasibility and advancement of the technology can also be verified through indoor experiments. The in-situ CO2 storage amount and hydrogen production amount of the high-temperature CO2 preheating reservoir in cooperation with the electromagnetic heating reservoir under different factors (target reservoir characteristics, development stage, preheating temperature, etc.) can be quantitatively obtained, which can provide support for parameter optimization of the technology and promote its field application.

[0051] It should be noted that the present application is applicable to any conventional, unconventional oil and gas and coal reservoirs such as conventional sandstone reservoirs, oil shale reservoirs and heavy oil reservoirs.

[0052] The present application provides a method for evaluating the effect of in-situ carbon storage and hydrogen production in a reservoir based on a fine tube model, Figure 1 The implementation process schematic diagram of the method for evaluating the effect of in-situ carbon storage and hydrogen production in a reservoir based on a fine tube model is shown, and the method for evaluating the effect of in-situ carbon storage and hydrogen production in a reservoir based on a fine tube model specifically comprises:

[0053] S10, sand filling of the fine tube model 6;

[0054] In this embodiment, the sand filling method of the fine tube model 6 comprises:

[0055] S101, obtaining target reservoir natural core or outcrop and natural core or outcrop development status, wherein the target reservoir natural core and outcrop development status comprises water content and oil saturation;

[0056] S102, the target reservoir core is treated by oil washing, drying, water saturation, oil saturation and exploitation to restore the actual development state of the target reservoir. The developed core is crushed and filled into a fine tube model 6;

[0057] S103, the fine tube model 6 is deoxidized by inert gas.

[0058] It should be noted that when the fine tube model 6 is deoxidized by inert gas, the inert gas can be argon, nitrogen or helium. The fine tube model 6 is a spiral coil metal pipeline with a length greater than 18 m, a pressure resistance greater than 60 MPa and a temperature resistance greater than 600℃. The inner diameter of the fine tube model 6 is generally 6 mm, which can be 5-10 mm, but is not completely limited. The wall thickness is generally not less than 3 mm. The fine tube model 6 can be made of stainless steel. The length is generally not less than 15 m, which can be 15-20 m. The number of turns is determined by the diameter of the coil.

[0059] At the same time, catalysts such as iron ions and SiC can be added during sand filling to reduce the reaction temperature.

[0060] S20, connecting the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the fine tube model to the experimental process, debugging the instrument equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the fine tube model;

[0061] When debugging the instrument equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the fine tube model, the experimental process based on the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the fine tube model is connected. The instrument equipment in the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the fine tube model is debugged, and then the first valve 10, the second valve 12 and the third valve 13 are closed, and the heating device 19 is opened to heat the carbon dioxide in the piston container 18 to a preset temperature.

[0062] S30, injecting high-temperature CO2 into the fine tube model 6, and preheating the fine tube model 6 with high-temperature CO2;

[0063] It should be noted that when high-temperature CO2 is injected into the fine tube model 6, the first valve 10 and the third valve 13 are opened, and then the ISCO injection pump 20 is opened. The ISCO injection pump 20 injects high-temperature CO2 in the piston container 18 into the fine tube model 6, and monitors the temperature of the infrared thermometer 14 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.

[0064] S40, electromagnetic wave heating of the fine tube model 6 to prepare hydrogen gas;

[0065] The method for preparing hydrogen gas by heating the fine tube model 6 with electromagnetic wave, comprising:

[0066] The electromagnetic wave generator 3 is started, electromagnetic waves generated by the electromagnetic wave generator 3 propagate to the simulation reaction chamber 5 through the electromagnetic wave generation chamber 2 and the waveguide 4 and act on the tubular model 6 to continue heating, 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.

[0067] The preset temperature can be set as a multiple of the hydrogen generation temperature, for example, 1.2 times of the hydrogen generation temperature. The hydrogen generation temperature is related to the lithology and physical properties of the target reservoir.

[0068] S50, collecting hydrogen and determining the timing of ending the experiment;

[0069] When the hydrogen is collected and the timing of ending the experiment is determined, the gas in the tubular model 6 is filtered to remove other gases through the hydrogen filter membrane 8 to obtain a pure hydrogen stream, the gas flow is recorded through the gas flow meter 15, and finally the hydrogen is collected into the hydrogen collection bottle 17. When the monitored value of the gas flow meter 15 decreases to a preset threshold, the second valve 12 is closed.

[0070] S60, repeating S30-S50 until the hydrogen flow decreases to 0 to end the experiment, and closing the equipment to clean up the experimental process.

[0071] It should be noted that the experiment is ended after the hydrogen flow in the tubular model 6 decreases to a certain extent in step S50, the pump-in volume of the ISCO pump is recorded as the CO2 storage volume, all equipment is closed, and the device is cooled and disassembled for cleaning after the experimental process.

[0072] In this embodiment, a reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a tubular model is also provided, as shown in Figure 5 The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a tubular model includes:

[0073] A control and monitoring module 1;

[0074] It should be noted that the control and monitoring module 1 can be a monitoring computer system.

[0075] An electromagnetic wave generation chamber 2 is installed in the electromagnetic wave generation chamber 2, and an electromagnetic wave generator 3 is installed in the electromagnetic wave generation chamber 2. The electromagnetic wave generator 3 is electrically connected to the control and monitoring module 1 through the control wire 9. One side of the electromagnetic wave generation chamber 2 is provided with a waveguide 4, and the waveguide 4 is used to propagate electromagnetic waves generated by the electromagnetic wave generator 3;

[0076] It should be noted that the electromagnetic wave generator 3 includes two kinds of magnetrons and solid generators, and the solid generator is an upgraded version with higher power and frequency, but in the application background of the electromagnetic wave heating of the present patent, a too high frequency is not needed, and the magnetron is more mature for microwave heating (such as a microwave oven). The working frequency of the microwave generator is 3-5 GHz, and the maximum power is not less than 3kW.

[0077] An analog reaction chamber 5 is provided, a fine tube model 6 is fixedly installed in the analog reaction chamber 5, the fine tube model 6 is filled with saturated oil sand, a second valve 12 is installed at the top of the fine tube model 6, and the second valve 12 is used to control the opening and closing of the fine tube model 6.

[0078] A hydrogen filtering membrane 8 is detachably installed in the fine tube model 6, and the hydrogen filtering membrane 8 is used to filter the generated hydrogen.

[0079] A gas pipeline 16 in communication with the fine tube model 6 is provided, and a gas flow meter 15 is installed in the gas pipeline 16, and the gas flow meter 15 is used to record the flow of gas.

[0080] A hydrogen collecting bottle 17 in communication with the gas pipeline 16 is provided, and the hydrogen collecting bottle 17 is used to collect the generated hydrogen.

[0081] A first valve 10 in communication with one end of the fine tube model 6 is provided, a pressure gauge 11 is communicated to the end of the first valve 10 away from the fine tube model 6, and the pressure gauge 11 is electrically connected to the control and monitoring module 1 through a control wire 9.

[0082] A sealing gasket 7 is installed at the bottom of the analog reaction chamber 5, the sealing gasket 7 is sleeved outside the lower end of the fine tube model 6, and the sealing gasket 7 is used to seal and protect the fine tube model 6.

[0083] A third valve 13 is provided on one side of the pressure gauge 11, the third valve 13 is in communication with the pressure gauge 11, and a piston container 18 is in communication with the side of the third valve 13 away from the pressure gauge 11.

[0084] The piston container 18 is used to contain carbon dioxide gas, one side of the piston container 18 is in communication with an ISCO injection pump 20, and the piston container 18 is fixedly installed in a heating device 19.

[0085] In the embodiment, the heating device 19 is a heating jacket heating device, and the parameters of the heating device 19 are as follows: the heating temperature range is ≤800℃, and the thermal conductivity coefficient of the heat preservation layer is 0.042 W / m·K.

[0086] An infrared thermometer 14 is fixedly installed on the side wall of the analog reaction chamber 5, and the infrared thermometer 14 is used to measure the temperature of the fine tube model 6 in real time. Embodiment

[0087] The embodiment provides a reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a capillary tube model, Figure 2 A schematic diagram of the temperature and hydrogen production rate curve of example 1 is shown.

[0088] S10, obtaining natural shale lithology in the Ordos Basin, treating the natural shale lithology by oil washing, drying, water saturation, oil saturation and the like, and developing the natural shale lithology by using CO2 until the remaining oil saturation is 50%, crushing the core, and filling a capillary tube model 6 (the capillary tube model 6 has a length of 18 m) to obtain the capillary tube model 6, and performing deoxidation treatment on the capillary tube model 6 by using inert gases such as argon;

[0089] S20, according to a capillary tube model based reservoir in-situ carbon storage and hydrogen production effect evaluation device connection experiment process, debugging instrument equipment of the capillary tube model based reservoir in-situ carbon storage and hydrogen production effect evaluation device, closing the first valve 10, the second valve 12 and the third valve 13, and opening the heating device 19 to heat the carbon dioxide in the piston container 18 to 200 DEG C;

[0090] S30, opening the first valve 10 and the third valve 13, opening the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the capillary tube model 6, and 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;

[0091] S40, opening the electromagnetic wave generator 3, the electromagnetic wave generated by the electromagnetic wave generator 3 propagates to the simulation reaction chamber 5 through the electromagnetic wave generation chamber 2 and the waveguide tube 4 and acts on the capillary tube model 6 to continue heating, then opening the second valve 12, monitoring the readings of the infrared thermometer 14 and the pressure gauge 11, and closing the electromagnetic wave generator 3 when the temperature reaches 500 DEG C;

[0092] S50, the gas in the capillary tube model 6 is filtered to remove other gases through the hydrogen filter membrane 8 to obtain pure hydrogen gas flow, and the flow of the gas is recorded through the gas flow meter 15, finally the hydrogen is collected into the hydrogen collection bottle 17, and the second valve 12 is closed when the monitored value of the gas flow meter 15 reduces to 0;

[0093] S60, repeating S30-S50 until the experiment is ended when the hydrogen flow in the capillary tube model 6 reduces to 0 in step S50, recording the pump-in volume of the ISCO pump as the CO2 storage volume, closing all the equipment, and disassembling and cleaning the experiment process after the device is cooled. Example

[0094] The embodiment provides a reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a capillary tube model, Figure 3 A schematic diagram of the temperature and hydrogen production rate curve of example 2 is shown.

[0095] S10, obtain the Ordos Basin natural shale lithology, after washing oil, drying, saturated water, saturated oil and other treatments, develop it with CO2 to a remaining oil saturation of 50%, crush the core and fill a thin tube model 6 (the thin tube model 6 has a length of 18 m) with SiC at a mass ratio of 9:1, and deoxidize the thin tube model 6 with an inert gas such as argon after filling is completed;

[0096] S20, according to the experimental flow of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a thin tube model, debug the instrument and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a thin tube model, close the first valve 10, the second valve 12 and the third valve 13, and open the heating device 19 to heat the carbon dioxide in the piston container 18 to 200℃;

[0097] S30, open the first valve 10 and the third valve 13, open the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the thin tube model 6, and monitor the temperature of the infrared thermometer 14 in real time, and close the ISCO pump and the third valve 13 when the pressure of the pressure gauge 11 reaches 15 MPa;

[0098] S40, open the electromagnetic wave generator 3, the electromagnetic wave generated by the electromagnetic wave generator 3 propagates to the simulation reaction chamber 5 through the electromagnetic wave generation chamber 2 and the waveguide 4 and acts on the thin tube model 6 to continue heating, then open the second valve 12, monitor the readings of the infrared thermometer 14 and the pressure gauge 11, and close the electromagnetic wave generator 3 when the temperature reaches 500℃;

[0099] S50, the gas in the thin tube model 6 is filtered to remove other gases through the hydrogen gas filter membrane 8 to obtain a pure hydrogen gas stream, and the flow of the gas is recorded through the gas flow meter 15, and finally the hydrogen gas is collected into the hydrogen gas collection bottle 17, and the second valve 12 is closed when the monitored value of the gas flow meter 15 decreases to 0;

[0100] S60, repeat S30-S50 until the end of the experiment when the hydrogen flow in the thin tube model 6 in step S50 decreases to 0, record the pump-in volume of the ISCO pump as the CO2 storage volume, close all equipment, and after the device cools down, disassemble and clean the experimental flow. Embodiment

[0101] The embodiment provides a reservoir in-situ carbon storage and hydrogen production effect evaluation method based on a thin tube model, Figure 4 Fig. 3 shows a temperature and hydrogen production rate curve diagram of embodiment 3.

[0102] S10, obtain the Ordos Basin natural shale lithology, after washing oil, drying, saturated water, saturated oil and other treatments, develop it with CO2 to a remaining oil saturation of 30%, crush the core and fill a thin tube model 6 (the thin tube model 6 has a length of 18 m), after the thin tube model 6 is filled, deoxidize it with inert gases such as argon;

[0103] S20, according to the experimental process of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a thin tube model, debug the instrument equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on a thin tube model, close the first valve 10, the second valve 12 and the third valve 13, open the heating device 19 to heat the carbon dioxide in the piston container 18 to 200℃;

[0104] S30, open the first valve 10 and the third valve 13, open the ISCO injection pump 20 to inject the high-temperature CO2 in the piston container 18 into the thin tube model 6, monitor the temperature of the infrared thermometer 14 in real time, and close the ISCO pump and the third valve 13 when the pressure of the pressure gauge 11 reaches 15 MPa;

[0105] S40, open the electromagnetic wave generator 3, the electromagnetic wave generated by the electromagnetic wave generator 3 propagates to the simulation reaction chamber 5 through the electromagnetic wave generation chamber 2 and the waveguide 4 and acts on the thin tube model 6 to continue heating, then open the second valve 12, monitor the readings of the infrared thermometer 14 and the pressure gauge 11, and close the electromagnetic wave generator 3 when the temperature reaches 500℃;

[0106] S50, the gas in the thin tube model 6 is filtered to remove other gases through the hydrogen gas filter membrane 8 to obtain a pure hydrogen gas stream, and the flow of the gas is recorded through the gas flow meter 15, finally the hydrogen gas is collected into the hydrogen gas collection bottle 17, and the second valve 12 is closed when the monitored value of the gas flow meter 15 decreases to 0;

[0107] S60, repeat S30-S50 until the end of the experiment when the hydrogen gas flow in the thin tube model 6 decreases to 0 in step S50, record the pump-in volume of the ISCO pump as the CO2 storage volume, close all the equipment, and after the device is cooled, disassemble and clean the experimental process.

[0108] Result analysis:

[0109] Example 1-3 compares 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 DEG C in the injection of high temperature CO2 stage, and then the model is rapidly heated to 500 DEG C under the action of electromagnetic heating, during which hydrogen is produced. It can be found that the time of hydrogen production is delayed and the temperature is increased after adding SiC, but the highest hydrogen production rate is obviously improved by comparing example 1 and 2; by comparing example 1 and 3, it can be found that the oil saturation is reduced, the hydrogen production time and temperature are basically unchanged, but the highest hydrogen production rate is reduced. The experimental parameters are summarized in Table 1.

[0110] Table 1 Comparison of key parameters of examples

[0111]

[0112] Table 1 shows that the three groups of experiments can effectively produce hydrogen and store CO2 in the reservoir, which verifies the feasibility and advancement of the technology. Increasing the content of organic matter in the reservoir and adding catalysts can effectively improve the hydrogen production rate.

[0113] In summary, the present application provides a reservoir in-situ carbon storage and hydrogen production effect evaluation device and method based on a capillary tube model. The present application uses high-temperature CO2 injection to preheat the reservoir and electromagnetic heating to produce hydrogen in-situ, which can break through the conventional oxygen injection combustion heating method and realize negative carbon hydrogen development. The feasibility and advancement of the technology can also be verified through laboratory experiments; the present application can quantitatively obtain the in-situ CO2 storage amount and hydrogen production amount of 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 parameter optimization of the technology and promote its field application.

[0114] It should be noted that for the foregoing examples, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the examples described in the specification all belong to preferred examples, and the actions and modules involved are not necessarily necessary for the present application.

[0115] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Obviously, the described examples are only some of the embodiments of the present application, but not all the embodiments. Based on these examples, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application. Although the present application is described in detail with reference to the above examples, those of ordinary skill in the art can still combine, add or delete the features in the embodiments of the present application according to the circumstances without creative work, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence, and these technical solutions also fall within the scope of the present application.

Claims

1. A device for evaluating in-situ carbon storage and hydrogen production effect of a reservoir based on a tubular model, characterized in that: The reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the tubular model comprises: a 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 with the control and monitoring module through control wiring, and a waveguide is installed on one side of the electromagnetic wave generating chamber, and the waveguide is used to propagate electromagnetic waves generated by the electromagnetic wave generator; an analog reaction chamber, wherein a tubular model is fixedly installed in the analog reaction chamber, the tubular model is filled with saturated oil sand, and a second valve is installed on the top of the tubular model, and the second valve is used to control the opening and closing of the tubular model; a hydrogen gas filtering membrane, which is detachably installed in the tubular model and used to filter generated hydrogen gas; a gas pipeline in communication with the tubular model, wherein a gas flow meter is installed in the gas pipeline, and the gas flow meter is used to record the flow of gas; a hydrogen gas collecting bottle, which is in communication with the gas pipeline and used to collect generated hydrogen gas; a first valve, which is in communication with one end of the tubular model, and a pressure gauge is communicated with the end of the first valve away from the tubular model, and the pressure gauge is electrically connected with the control and monitoring module through control wiring; a sealing washer, which is installed at the bottom of the analog reaction chamber, and the sealing washer is sleeved outside the lower end of the tubular model and used to seal and protect the tubular model; a third valve, which is arranged on one side of the pressure gauge, in communication with the pressure gauge, and has a piston container communicated with the side away from the pressure gauge; the piston container, which is used to contain carbon dioxide gas, has one side in communication with an ISCO injection pump, and is fixedly installed in a heating device; an infrared thermometer, which is fixedly installed on the side wall of the analog reaction chamber and used to measure the temperature of the tubular model in real time. The tubular model is a spiral coiled metal pipe with a length greater than 15 m, a pressure resistance greater than 60 MPa, and a temperature resistance greater than 600℃.

2. The method for evaluating the in-situ carbon storage and hydrogen production effect of the reservoir based on the tubular model of the device according to claim 1, characterized in that, The reservoir in-situ carbon storage and hydrogen production effect evaluation method based on the tubular model comprises: S10, sand filling of the tubular model; S20, connection of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the tubular model and debugging of the instrument and equipment of the reservoir in-situ carbon storage and hydrogen production effect evaluation device based on the tubular model; S30, injection of high-temperature CO2 into the tubular model, and preheating of the tubular model by the high-temperature CO2; S40, electromagnetic wave heating of the tubular model to prepare hydrogen gas; S50, collection of hydrogen gas and determination of the timing of the end of the experiment; S60, repetition of S30-S50 until the end of the experiment when the hydrogen gas flow decreases to 0, and shutdown of the equipment and cleaning of the experimental process.

3. The method for evaluating in-situ carbon storage and hydrogen production effect of reservoirs based on the fine tube model according to claim 2, characterized in that: The sand filling method of the tubular model comprises: S101, obtaining target reservoir natural core or outcrop and natural core or outcrop development status, wherein the target reservoir natural core and outcrop development status comprises water content and oil saturation; S102, reduction of the actual development state of the target reservoir by washing oil, drying, water saturation, oil saturation and exploitation treatment of the target reservoir natural core, crushing of the developed core and preparation of the tubular model; S103, deoxygenation treatment of the tubular model by inert gas.

4. The reservoir in-situ carbon storage and hydrogen production effect evaluation method based on the tubular model according to claim 3, characterized in that: When injecting high-temperature CO2 into the capillary model, open the first valve and the third valve, then open the ISCO injection pump, the ISCO injection pump injects high-temperature CO2 in the piston container into the capillary model, and the temperature of the infrared thermometer is monitored in real time, and when the pressure of the pressure gauge reaches the preset pressure, the ISCO pump and the third valve are closed.

5. The method for evaluating in-situ carbon storage and hydrogen production effect of reservoirs based on the fine tube model according to claim 4, characterized in that: The method for preparing hydrogen by heating the capillary model with electromagnetic waves comprises the following steps: The electromagnetic wave generator is turned on, the electromagnetic waves generated by the electromagnetic wave generator propagate to the simulation reaction chamber through the electromagnetic wave generating chamber and the waveguide, and continue to heat the capillary model, then the second valve is opened, and the readings of the infrared thermometer and the pressure gauge are monitored, and when the temperature reaches the preset temperature, the electromagnetic wave generator is turned off.

6. The method for evaluating in-situ carbon storage and hydrogen production effect of reservoirs based on the fine tube model according to claim 5, characterized in that: The collected hydrogen gas and the gas in the capillary model at the end of the experiment are filtered through the hydrogen gas filter membrane to remove other gases to obtain pure hydrogen gas flow, and the gas flow is recorded through the gas flow meter, and finally the hydrogen gas is collected into the hydrogen gas collection bottle, and when the monitored value of the gas flow meter decreases to the preset threshold value, the second valve is closed.

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

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