Evaluation device for complementing and storing efficiency of carbon dioxide in shale reservoir and use method

Abstract

The invention discloses a device for evaluating the complementation and storage efficiency of carbon dioxide in a shale reservoir and a use method. The device comprises an experimental box and a sample reaction cavity, at least one end of the experiment box is provided with a box door, the sample reaction cavity can be pushed out of the box door, the sample reaction cavity is connected with an inflation mechanism and a water vapor supplementing mechanism, and a pushing mechanism for fixing the sample reaction cavity is arranged in the experiment box; the sample reaction cavity can be pushed by the pushing mechanism to contact with the side wall of the experiment box so as to be fixed; detection parts are arranged in the experiment box and the sample reaction cavity; a pressure regulating part is also arranged on the experiment box; the temperature, the pressure and the water-containing environment of the shale reservoir can be accurately simulated and monitored through multiple built-in monitoring designs; through the combined design of the sample reaction cavity and the experiment box, the carbon dioxide injection storage and external diffusion environment can be met, and dynamic monitoring is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and in particular to a device for evaluating the collection and storage efficiency of carbon dioxide in a shale reservoir and a method for using the device. Background Art

[0002] In recent years, my country has taken "carbon peak" and "carbon neutrality" as strategic goals for long-term development. From the perspective of low-carbon development and carbon emission reduction, CCUS (Carbon Capture, Utilization and Storage) is being promoted. Carbon dioxide emitted during the production process is stored, or recycled and reused in new production processes after purification. CCUS technology turns carbon dioxide into resources, generates economic benefits, and is beneficial to environmental protection. It is the only means so far that can greatly reduce greenhouse gas emissions from industrial processes and is one of the key technologies for addressing global climate change. Fossil energy, as the main support for the current global energy supply, is facing the pressure of large amounts of carbon dioxide emissions. In order to continuously promote the realization of this strategic goal, it is necessary not only to improve the utilization efficiency of traditional fossil energy and reduce carbon dioxide emissions, but more importantly, to effectively utilize and treat carbon dioxide. Shale oil and gas reservoirs can be an ideal place for geological storage of carbon dioxide. Carbon dioxide can enter the shale reservoir, which can not only replace methane gas through strong adsorption to increase the recovery rate of shale gas, but also realize carbon collection, utilization and storage, while increasing natural gas production for the country and contributing to low-carbon environmental protection.

[0003] At present, there are some reports on the technology of carbon dioxide emission reduction or storage in China. Alkaline substances are combined with wet soil to react with carbon dioxide and fix it in the soil; carbon dioxide is injected into the seabed to form carbon dioxide hydrates under high pressure and low temperature for storage. These types of related carbon dioxide injection and storage technologies are still in the exploratory stage. There is still a gap in the evaluation of carbon dioxide collection and storage equipment and technology in shale reservoirs in China. Shale reservoirs have high temperatures and formation pressures. After carbon dioxide enters the shale reservoir, it will change its phase due to the influence of temperature and pressure. There is no evaluation device and method for the collection, utilization and storage effect of carbon dioxide in shale reservoirs.

[0004] The prior art has the following technical problems:

[0005] Most of the existing carbon dioxide storage simulation devices are used to simulate the temperature and pressure environment of the ocean environment, monitor the acidity data of carbon dioxide hydrate formation or storage surface, and then issue early warnings. They are not suitable for the evaluation of carbon dioxide collection and storage experiments in shale reservoirs. Summary of the invention

[0006] The purpose of the present invention is to provide a device and a method for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs in view of the above-mentioned shortcomings, thereby solving the problem of the lack of existing devices and methods. The mechanical generation structure can facilitate the installation of shale samples and safety inspection of the reaction process, and can accurately simulate key parameters such as reservoir temperature, pressure and water-containing environment, so as to study the efficiency of shale in collecting and storing carbon dioxide, thus solving the problem that there is currently no available device for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs.

[0007] A device for evaluating the collection and storage efficiency of carbon dioxide in a shale reservoir comprises the following steps:

[0008] The invention comprises an experimental box and a sample reaction chamber; a box door is arranged at at least one end of the experimental box, the sample reaction chamber can be pushed out of the box door, an air filling mechanism and a water vapor replenishing mechanism are connected to the sample reaction chamber, a pushing mechanism for fixing the sample reaction chamber is arranged in the experimental box; the sample reaction chamber can be pushed by the pushing mechanism to contact the side wall of the experimental box so as to be fixed; a detection part is arranged in the experimental box and the sample reaction chamber; a pressure regulating part is also arranged on the experimental box.

[0009] Based on the structure of the above-mentioned device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs, an insulation layer is provided inside the experimental box, and a sealing layer is provided at the box door. When the box door is closed, the experimental box is in a sealed state.

[0010] Based on the structure of the above-mentioned device for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs, a receiving seat, a push plate and an electric push rod are arranged at the bottom of the experimental box; the receiving seat is fixedly arranged at the bottom position of the experimental box, the push plate is arranged on the receiving seat, one end of the electric push rod is connected to the side wall of the experimental box, and the other end is connected to the push part, and when the box door is open, the electric push rod can move to push the push plate out of the experimental box.

[0011] Based on the structure of the above-mentioned device for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs, the sample reaction chamber includes a sample placement tube, a heating component and an end cover; one end of the sample placement tube is open, the end cover is movably arranged in the sample placement tube, a sealing member is arranged on the contact portion between the end cover and the sample placement tube, the heating component is arranged around the sample placement tube, at least one solenoid valve and a temperature detector are arranged on the side wall of the sample placement tube, and a resistance sensor is arranged on the inner wall of the sample placement tube.

[0012] Based on the structure of the above-mentioned device for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs, a support block and a transmission tube are arranged at the bottom of the sample placement tube, the support block is arranged at the bottom outer position of the sample placement tube, the end of the transmission tube passes through the sample placement tube, and the transmission tube is respectively connected to the inflation mechanism and the water vapor replenishment mechanism.

[0013] Based on the structure of the above-mentioned device for evaluating the efficiency of collection and storage of carbon dioxide in shale reservoirs, a first through hole is provided on the box body for a transmission pipe to pass through, and the transmission pipe passes through the first through hole to be connected with an external inflation mechanism and a water vapor replenishment mechanism; the inflation mechanism includes an inflation pump, a first gas cylinder and a second gas cylinder, the first gas cylinder and the second gas cylinder are connected through a first pipeline, a switch valve is provided on the first pipeline, one end of the inflation pump is connected to the first gas cylinder and the second gas cylinder, and the other end is connected to the transmission pipe; carbon dioxide is filled in the first gas cylinder, and methane is filled in the second gas cylinder; the water vapor replenishment mechanism includes a steam generator and a pump body.

[0014] Based on the structure of the above-mentioned device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs, an exhaust pipe and a one-way valve are arranged on the end cover, the exhaust pipe penetrates the end cover, and the one-way valve is arranged on the exhaust pipe.

[0015] Based on the structure of the above-mentioned device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs, a carbon dioxide concentration sensor is also provided inside the box, and the pressure regulating part is a pressure regulating pump.

[0016] Based on the structure of the above-mentioned device for evaluating the collection and storage efficiency of carbon dioxide in shale reservoirs, a control unit is also provided on the experimental box, and the control unit includes a display screen assembly, a fixed shell, a monitoring assembly, an anti-interference protector, a gas sensing receiver and a controller; the display screen assembly is arranged on the fixed shell, the monitoring assembly and the anti-interference protector are arranged in the fixed shell, the gas sensing receiver is connected to the carbon dioxide concentration sensor and the monitoring assembly through lines, respectively, the monitoring assembly is connected to the display screen assembly, and the controller is connected to the heating assembly, the air pump, the pump body, the pressure regulating pump, the solenoid valve, the electric push rod, and the pushing cylinder.

[0017] This solution provides a method for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs, which includes the following steps:

[0018] Step 1: First, use the electric push rod to move the sample reaction chamber to the outside of the experimental box, place the rock sample in the sample placement tube, close the end cover, move the sample reaction chamber back to the closed space inside the experimental box by the electric push rod, lock the box door, open the push assembly, make the output part of the push cylinder contact with the end cover, and make the bottom support block of the sample placement tube closely contact with the box door, realize the sealing of the sample placement chamber in the process of pushing, and finally complete the filling and fixation of the shale sample;

[0019] Step 2: Turn on the heating component through the control unit to simulate the reservoir temperature and pressure environment, and slowly inject water vapor through the pump body, and monitor the water content of the rock sample through the resistance sensor;

[0020] Step 3: Use the control unit to monitor the shale sample for the first time, and transmit the monitoring data to the display screen component to obtain initial data;

[0021] Step 4: The initial rock sample is placed in a sealed sample placement tube, and methane gas is pumped into the saturated core through an air pump. The saturation is completed after the monitoring data is stable; the air pressure regulating pump in the sealed box is used to pressurize / depressurize the closed environment outside the rock sample to achieve different pressure gradients in the reservoir to simulate actual gas reservoir production. When production reaches the middle and late stages, carbon dioxide is injected using different injection methods and the well is properly sealed for a period of time. The solenoid valve in the sample reaction chamber is opened to start the collection and storage effect evaluation experiment;

[0022] Step 5: Use multiple carbon dioxide concentration sensors of the controller to monitor different positions around the shale sample, and transmit the monitoring data to the display screen assembly for comparison and analysis with the initial data. In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. This scheme sets up structures such as an experimental box, a sample reaction chamber and a top monitoring display. The built-in multiple monitoring designs can accurately simulate and monitor the temperature, pressure and water-containing environment of the shale reservoir; through the sample reaction chamber and the experimental box, the combined design can meet the carbon dioxide injection storage and external diffusion environment, and realize dynamic monitoring. Finally, the carbon dioxide replenishment and effective storage volume with the burial time or formation pressure can be calculated, and the economic efficiency and risk of carbon dioxide in the shale reservoir can be predicted and evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structural diagram of the present invention;

[0025] Figure 2 Schematic diagram of the cross section of the sample reaction chamber in this scheme;

[0026] Figure numerals: 1, experimental box; 2, sample reaction chamber; 3, inflation mechanism; 4, water vapor replenishment mechanism; 5, driving mechanism; 6, control unit; 101, box door; 102, insulation layer; 103, receiving seat; 104, driving plate; 105, electric push rod; 106, first through hole; 107, carbon dioxide concentration sensor; 108, pressure regulating pump; 201, sample placement tube; 202, heating component; 203, end cover; 204, solenoid valve; 2 05. Temperature detector; 206. Resistance sensor; 207. Support block; 208. Transmission pipe; 209. Exhaust pipe; 210. One-way valve; 301. Air pump; 302. First gas cylinder; 303. Second gas cylinder; 304. Switch valve; 401. Pump body; 402. Water vapor generator; 601. Display screen assembly; 602. Fixed shell; 603. Monitoring assembly; 604. Anti-interference protector; 605. Gas sensing receiver. DETAILED DESCRIPTION

[0027] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0028] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution:

[0033] A device for evaluating the collection and storage efficiency of carbon dioxide in a shale reservoir includes at least but is not limited to an experimental box 1 and a sample reaction chamber 2; a box door 101 is provided at at least one end of the experimental box 1, and the sample reaction chamber 2 can be pushed out of the box door 101; an inflation mechanism 3 and a water vapor replenishment mechanism 4 are connected to the sample reaction chamber 2; a pushing mechanism 5 for fixing the sample reaction chamber 2 is provided in the experimental box 1; the sample reaction chamber 2 can be pushed by the pushing mechanism 5 to contact the side wall of the experimental box 1 so as to be fixed; a detection part is provided in the experimental box 1 and the sample reaction chamber 2; and a pressure regulating part is also provided on the experimental box 1.

[0034] Based on the above structure, the experimental box 1 is provided with a box door 101, which can be opened quickly, so as to open the sample reaction chamber 2 to prevent the rock sample, and at the same time, other components inside the box can also be maintained; the sample reaction chamber 2 is provided with an inflation mechanism 3 and a water vapor replenishment mechanism 4 to simulate different environments of the rock sample, and at the same time, a pressure regulating part is provided in the experimental box 1 to simulate the release rate of carbon dioxide of the rock sample under different external pressures, so that the present scheme can meet the carbon dioxide injection storage and external diffusion environment through the combination of the internal reactor and the external cavity closed box design, and realize dynamic monitoring; by setting the detection part, various indicators to be tested can be efficiently detected.

[0035] As an example, an insulation layer 102 is provided inside the experimental box 1, and a sealing layer can be provided at the box door 101. When the box door 101 is closed, the experimental box 1 is in a sealed state, ensuring accurate detection of various data in the box.

[0036] As an example, a receiving seat 103, a pushing plate 104 and an electric push rod 105 may be provided at the bottom of the experimental box 1; the receiving seat 103 is fixedly set at the bottom position of the experimental box 1, the pushing plate 104 is set on the receiving seat 103, one end of the electric push rod 105 is connected to the side wall of the experimental box 1, and the other end is connected to the pushing part. When the box door 101 is open, the electric push rod 105 can move to push the pushing plate 104 out of the experimental box 1.

[0037] Based on the above structure, the sample reaction chamber 2 is placed on the push plate 104. When the box door 101 is opened, the electric push rod 105 moves to push the push plate 104 loaded with the sample reaction chamber 2 out of the experimental box 1, so as to facilitate the loading of the rock sample.

[0038] As an example, the pushing mechanism 5 can be a pushing cylinder or a pushing cylinder. In this embodiment, a pushing cylinder is taken as an example. The main body of the pushing cylinder is connected to the side wall of the experimental box 1, and the output part of the pushing cylinder is directly opposite to the movable part of the sample reaction chamber 2.

[0039] Based on the above structure, during the experiment, when the sample reaction chamber 2 is placed on the receiving seat 103, its movable end is opposite to the output part of the pushing cylinder. When the cylinder is pushed, the bottom of the sample reaction chamber 2 is in contact with and pressed against the box door 101. Under the action of the pushing cylinder, the movable end fixes the rock sample in the sample reaction chamber 2, and the interior of the sample reaction chamber 2 is sealed during the pushing process.

[0040] As an example, the sample reaction chamber 2 may include a sample placement tube 201, a heating component 202 and an end cover 203; one end of the sample placement tube 201 is open, the end cover 203 is movably arranged in the sample placement tube 201, a seal may be arranged on the contact portion between the end cover 203 and the sample placement tube 201, the heating component 202 is arranged around the sample placement tube 201, at least one solenoid valve 204 and a temperature detector 205 are arranged on the side wall of the sample placement tube 201, and a resistance sensor 206 is arranged on the inner wall of the sample placement tube 201.

[0041] Based on the above structure, the heating component 202 can heat the sample placement cavity, so that it can simulate the release rate of carbon dioxide of the rock sample under different ambient temperatures, making the simulation of this scheme more comprehensive and accurate; at the same time, the solenoid valve 204 is provided in this scheme, which is used to open and close the internal space of the sample placement tube 201 and the internal space of the experimental box 1 in a sealed environment, so as to facilitate the release of internal gas substances into the experimental box 1, realize the detection of gas objects, and finally calculate the complementary amount and effective storage amount of carbon dioxide with the burial time or formation pressure, and predict and evaluate the economic and risk of carbon dioxide in shale reservoirs. Temperature detection is used to detect the temperature of the sample placement cavity, making the simulation more accurate; the resistance sensor 206 is used to detect the water content of the rock sample when adding water vapor in the sample placement cavity, so that it can simulate the water-containing environment of the rock sample.

[0042] As an example, a support block 207 and a transmission tube 208 may be provided at the bottom of the sample placement tube 201. The support block 207 is provided at the bottom outer position of the sample placement tube 201. The end of the transmission tube 208 passes through the sample placement tube 201. The transmission tube 208 is respectively connected to the inflation mechanism 3 and the water vapor replenishment mechanism 4.

[0043] Based on the above structure, the support block 207 can prevent the transmission tube 208 from contacting the box door 101, thereby ensuring that the transmission tube 208 is normal when conveying the medium.

[0044] As an example, a first through hole 106 through which a transmission pipe 208 passes is provided on the box body, and the transmission pipe 208 passes through the first through hole 106 to be connected with an external inflation mechanism 3 and a water vapor replenishment mechanism 4; the inflation mechanism 3 may include an inflation pump 301, a first gas cylinder 302 and a second gas cylinder 303, the first gas cylinder 302 and the second gas cylinder 303 are connected through a first pipeline, and a switch valve 304 is provided on the first pipeline, one end of the inflation pump 301 is connected to the first gas cylinder 302 and the second gas cylinder 303, and the other end is connected to the transmission pipe 208; carbon dioxide is filled in the first gas cylinder 302, and methane is filled in the second gas cylinder 303.

[0045] The water vapor replenishing mechanism 4 may include a pump body 401 and a water vapor generator 402; both ends of the pump body 401 are connected to the water vapor generator 402 and the transmission pipe 208 respectively.

[0046] Based on the above structure, the liquid in the output tube can be transported to the sample placement tube 201 through the pump body 401 to simulate the water content of the rock sample. Carbon dioxide and methane can be respectively filled into the sample placement tube 201 as needed through the air pump 301 to provide necessary conditions for the simulation.

[0047] As an example, an exhaust pipe 209 and a one-way valve 210 may be provided on the end cover 203 . The exhaust pipe 209 is provided through the end cover 203 , and the one-way valve 210 is provided on the exhaust pipe 209 .

[0048] Based on the above structure, the sealed environment inside the sample placement chamber is connected to the outside atmosphere through the exhaust pipe 209, which facilitates the injection of gas and liquid.

[0049] As an example, a carbon dioxide concentration sensor 107 may also be provided inside the box to detect the concentration of carbon dioxide in the box for subsequent analysis.

[0050] As an example, the pressure regulating unit may be a pressure regulating pump 108 .

[0051] As an example, the experimental box 1 can also be provided with a control unit 6, and the control unit 6 can include a display screen assembly 601, a fixed shell 602, a monitoring assembly 603, an anti-interference protector 604, a gas sensing receiver 605 and a controller; the display screen assembly 601 is arranged on the fixed shell 602, the monitoring assembly 603 and the anti-interference protector are arranged in the fixed shell 602, the gas sensing receiver 605 is connected to the carbon dioxide concentration sensor 107 and the monitoring assembly 603 through lines respectively, the monitoring assembly 603 is connected to the display screen assembly 601, and the controller is connected to the heating assembly 202, the inflation pump 301, the pump body 401, the pressure regulating pump 108, the solenoid valve 204, the electric push rod 105, and the pushing cylinder.

[0052] Based on the above structure, the display screen component 601 can display various data monitored by the monitoring component 603 in real time to facilitate the experiment, and the control unit 6 can control various components.

[0053] Example 2

[0054] This embodiment provides a specific experimental method.

[0055] The sample reaction chamber 2 is moved to the outside of the experimental box 1 by the electric push rod 105, and a columnar shale sample with a diameter of 10 cm and a length of 20 cm is placed in the sample placement tube 201. Then the end cover 203 is closed, and the sample reaction chamber 2 is moved back to the closed space inside the experimental box 1 by the electric push rod 105. The box door 101 is locked, and the pushing assembly is opened so that the output part of the pushing cylinder contacts the end cover 203, and the bottom support block 207 of the sample placement tube 201 contacts the box door 101 closely. The sample placement chamber is sealed during the pushing process, and finally the shale sample is filled and fixed.

[0056] The heating component 202 is turned on by the control unit 6 to heat the sample placement tube 201 to 90°C. After the temperature stabilizes for 10 minutes, water vapor is slowly injected through the pump body 401 and the water content of the rock sample is monitored through the resistance sensor 206. When the water saturation reaches 40%, the water vapor injection is terminated. The control unit 6 monitors the shale sample for the first time and transmits the monitoring data to the display screen component 601 to obtain initial data.

[0057] The initial rock sample is placed in a sealed sample placement tube 201, and then the methane gas is pumped into the core through the air pump 301. The saturation is completed after the monitoring data is stable. The closed environment in the test box 1 is pressurized / reduced by the pressure regulating pump 108 in the test box 1 to achieve different pressure gradients in the reservoir to simulate actual gas reservoir production. In the middle and late stages of production, the air pump 301 is used to inject carbon dioxide in a pulsed / continuous manner. After the predetermined amount is injected, the sample placement chamber is closed to simulate the well-clogging process for 3 days.

[0058] The solenoid valve 204 in the sample reaction chamber 2 is opened to connect the sample reaction chamber 2 with the inside of the experimental box 1, and the collection and storage effect evaluation experiment is started. During the whole process, multiple carbon dioxide concentration sensors 107 connected to the control unit 6 are used to monitor different positions around the shale sample, and the monitoring data is transmitted to the display screen assembly 601. After comparison and analysis with the initial data, the collection amount and effective storage amount of carbon dioxide with the storage time or formation pressure are calculated, and the economic efficiency and risk of carbon dioxide in the shale reservoir are predicted and evaluated.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs, characterized by: The invention comprises an experimental box and a sample reaction chamber; a box door is arranged at at least one end of the experimental box, the sample reaction chamber can be pushed out of the box door, an air filling mechanism and a water vapor replenishing mechanism are connected to the sample reaction chamber, a pushing mechanism for fixing the sample reaction chamber is arranged in the experimental box; the sample reaction chamber can be pushed by the pushing mechanism to contact the side wall of the experimental box so as to be fixed; a detection part is arranged in the experimental box and the sample reaction chamber; a pressure regulating part is also arranged on the experimental box.

2. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 1, characterized in that: The experimental box is provided with a heat-insulating layer inside and a sealing layer at the box door. When the box door is closed, the experimental box is in a sealed state.

3. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 2, characterized in that: A receiving seat, a pushing plate and an electric push rod are provided at the bottom of the experimental box; the receiving seat is fixedly arranged at the bottom position of the experimental box, the pushing plate is arranged on the receiving seat, one end of the electric push rod is connected to the side wall of the experimental box, and the other end is connected to the pushing part, and when the box door is open, the electric push rod can move the pushing plate out of the experimental box.

4. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 3, characterized in that: The sample reaction chamber includes a sample placement tube, a heating component and an end cover; one end of the sample placement tube is open, the end cover is movably arranged in the sample placement tube, a sealing member is arranged on the contact portion between the end cover and the sample placement tube, the heating component is arranged around the sample placement tube, at least one solenoid valve and a temperature detector are arranged on the side wall of the sample placement tube, and a resistance sensor is arranged on the inner wall of the sample placement tube.

5. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 4, characterized in that: A support block and a transmission tube are arranged at the bottom of the sample placement tube. The support block is arranged at the outer bottom position of the sample placement tube. The end of the transmission tube passes through the sample placement tube. The transmission tube is respectively connected to the inflation mechanism and the water vapor replenishment mechanism.

6. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 5, characterized in that: The box body is provided with a first through hole through which a transmission pipe passes, and the transmission pipe passes through the first through hole to be connected with an external inflation mechanism and a water vapor replenishing mechanism; the inflation mechanism includes an inflation pump, a first gas cylinder and a second gas cylinder, the first gas cylinder and the second gas cylinder are connected through a first pipeline, a switch valve is provided on the first pipeline, one end of the inflation pump is connected to the first gas cylinder and the second gas cylinder, and the other end is connected to the transmission pipe; carbon dioxide is filled in the first gas cylinder, and methane is filled in the second gas cylinder; the water vapor replenishing mechanism includes a water vapor generator and a pump body.

7. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 6, characterized in that: An exhaust pipe and a one-way valve are arranged on the end cover. The exhaust pipe penetrates the end cover, and the one-way valve is arranged on the exhaust pipe.

8. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to any one of claims 1 to 7, characterized in that: A carbon dioxide concentration sensor is also arranged inside the box, and the pressure regulating part is a pressure regulating pump.

9. The device for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs according to claim 8, characterized in that: The experimental box is also provided with a control unit, which includes a display screen assembly, a fixed shell, a monitoring assembly, an anti-interference protector, a gas sensing receiver and a controller; the display screen assembly is arranged on the fixed shell, the monitoring assembly and the anti-interference protector are arranged in the fixed shell, the gas sensing receiver is connected to the carbon dioxide concentration sensor and the monitoring assembly through lines, the monitoring assembly is connected to the display screen assembly, and the controller is connected to the heating assembly, the air pump, the pump body, the pressure regulating pump, the solenoid valve, the electric push rod, and the pushing cylinder.

10. A method for evaluating the efficiency of carbon dioxide collection and storage in shale reservoirs based on the device of claims 1 to 9, characterized in that: It includes the following steps: Step 1: First, use the electric push rod to move the sample reaction chamber to the outside of the experimental box, place the rock sample in the sample placement tube, close the end cover, move the sample reaction chamber back to the closed space inside the experimental box by the electric push rod, lock the box door, open the push assembly, make the output part of the push cylinder contact with the end cover, and make the bottom support block of the sample placement tube closely contact with the box door, realize the sealing of the sample placement chamber in the process of pushing, and finally complete the filling and fixation of the shale sample; Step 2: Turn on the heating component through the control unit to simulate the reservoir temperature and pressure environment, and slowly inject water vapor through the pump body, and monitor the water content of the rock sample through the resistance sensor; Step 3: Use the control unit to monitor the shale sample for the first time, and transmit the monitoring data to the display screen component to obtain initial data; Step 4: The initial rock sample is placed in a sealed sample placement tube, and methane gas is pumped into the saturated core through an air pump. The saturation is completed after the monitoring data is stable; the air pressure regulating pump in the sealed box is used to pressurize / depressurize the closed environment outside the rock sample to achieve different pressure gradients in the reservoir to simulate actual gas reservoir production. When production reaches the middle and late stages, carbon dioxide is injected using different injection methods and the well is properly sealed for a predetermined time. The solenoid valve in the sample reaction chamber is opened to start the collection and storage effect evaluation experiment; Step 5: Use the controller's multiple carbon dioxide concentration sensors to monitor different locations around the shale sample, and transmit the monitoring data to the display screen assembly for comparison and analysis with the initial data.

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