A method for combining reservoir CO2 utilization and storage process using electric field

Abstract

The present invention belongs to the technical field of CO2 capture, utilization and storage in unconventional reservoirs, and specifically relates to a method for combining the utilization and storage process of CO2 in reservoirs by using an electric field. The present invention places positive and negative electrodes in an injection well and a production well respectively, and uses the electrocatalytic oxidation of the injection well to significantly adsorb CO2; by using intermittent power outages, a CO2 concentration gradient is formed in the injection well and the production well, which promotes the movement of CO2 from the injection well to the production well by spontaneous diffusion, thereby reducing gas channeling. At the same time, an electrocatalytic reduction reaction is generated in the production well. In order to overcome the problem of insufficient efficiency of the current electrocatalytic reduction to reduce CO2 to carbon-containing substances, a hydroxylated nanocatalyst is involved, which adsorbs CO2 through hydroxylated groups, thereby improving the conversion efficiency of CO2 to reduce carbon-containing substances. The above method can improve the utilization and storage efficiency of CO2, improve the recovery rate of oil reservoirs, ensure energy security, and reduce greenhouse gas emissions.

Description

Technical Field

[0001] The present invention belongs to the technical field of unconventional reservoir CO2 capture, utilization and storage, and specifically relates to a method for combining reservoir CO2 utilization and storage processes by using an electric field. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Carbon capture, utilization and storage (CCUS) has attracted widespread attention in the oil industry. CCUS injects captured CO2 into the reservoir, takes advantage of CO2's adsorption of crude oil or gas, extracts crude oil and gas, and stores CO2 in the reservoir, thereby increasing the recovery rate. In this process, how to give full play to the role of injected CO2 and how to efficiently store CO2 are the focus of CCUS technology. Therefore, giving full play to the role of injected CO2 is aimed at increasing the recovery rate by taking advantage of CO2's adsorption of crude oil and gas, while efficiently storing CO2 is to achieve the storage of CO2 in the formation.

[0004] Generally, gas channeling is prone to occur when CO2 is injected into a wellbore. Currently, technicians use different chemical reagents to reduce the viscosity of CO2 to inhibit gas channeling. However, the use of chemical reagents has a certain investment cost, and the chemical agent and crude oil are difficult to separate after mixing.

[0005] At the same time, current patents and related research have shown that electrochemical CO2 reduction can convert CO2 into fuels such as methanol and convert CO2 into liquid fuels, thereby achieving alternative CO2 conversion and storage, which provides a potential direction for the geological storage of CO2.

[0006] For example, patent CN113187450A provides a CO2 electroreduction storage and oil production method, which is to place the positive electrode into the production well and the negative electrode into the injection well. After power is turned on, a redox reaction will occur, an oxidation reaction will occur at the positive electrode, and a reduction reaction will occur at the negative electrode. Therefore, it undergoes a reduction reaction in the injection well to generate target products such as methanol, but this method ignores the reduction reaction in the CO2 injection well. Although some methanol reactions will occur, since CO2 is a quadrupole molecule, it is more easily adsorbed by oxygen-containing functional groups, that is, it is more affinity to the oxidizing environment. Therefore, although this patent converts CO2 into the target product to achieve the storage of CO2, the efficiency of CO2 electrochemical reduction to form alternative CO2 additional products is not high, and a large amount of CO2 will escape and easily form gas channeling in the reservoir, which is not conducive to the storage of CO2. Therefore, there is an urgent need for a method of combining reservoir CO2 utilization and storage process using electrocatalysis to solve the above problems. Summary of the invention

[0007] In view of the above problems, the purpose of the present invention is to provide a method for combining the utilization and storage process of reservoir CO2 by using an electric field. The present invention uses the concentration field differential permeation method formed by electrocatalytic oxidation to weaken the influence of CO2 gas channeling, further improve the role of CO2 in developing oil and gas resources, and at the same time uses hydroxyl-containing cage catalysts to adsorb CO2 through surface hydroxyl groups to further achieve the electro-reduction of CO2 near the cathode area of ​​the wellbore, thereby accelerating the conversion of CO2 into fuel liquid to achieve alternative storage, providing a solid foundation for the efficient development of CCUS technology in reservoirs.

[0008] Specifically, the present invention provides the following technical solutions:

[0009] The first aspect of the present invention provides a method for combining the utilization and storage process of reservoir CO2 by using an electric field, specifically: placing a positive electrode and a negative electrode coated with a catalyst slurry into an injection well and a production well connected to the same interconnected well group, respectively, injecting CO2 gas into the reservoir and then energizing the reservoir, and achieving the utilization and storage of the reservoir CO2 through intermittent energization.

[0010] Preferably, the positive electrode and the negative electrode are both inert electrodes, and the inert electrodes are C electrodes or Pt electrodes.

[0011] Preferably, the catalyst slurry is prepared by combining a surface hydroxylated nanocatalyst with a perfluorinated resin solution (Nafion solution).

[0012] Further preferably, the surface hydroxylated nanocatalyst is first dissolved in an ethanol solution, and after being evenly dispersed, it is mixed with a perfluorinated resin solution to obtain a catalyst slurry; wherein the volume ratio of the ethanol solution of the surface hydroxylated nanocatalyst to the perfluorinated resin solution is 3:1.

[0013] Further preferably, the surface hydroxylated nanocatalyst is selected from one or more of surface hydroxylated Cu2O and metal Cu particles, preferably surface hydroxylated Cu2O.

[0014] Further preferably, the surface hydroxylated Cu2O is prepared by heating a copper salt solution and a reducing agent in an oil bath under alkaline conditions;

[0015] The copper salt solution is obtained by dissolving copper salt in ethylene glycol solution; the reducing agent is selected from one or more of sodium borohydride, ammonia borane and glucose, preferably glucose; the alkaline condition refers to adding an alkaline solution to a mixed solution of the copper salt solution and the reducing agent, and the alkaline solution is selected from one or more of potassium bicarbonate and potassium hydroxide, preferably potassium hydroxide (KOH);

[0016] The mass ratio of the copper salt to the reducing agent is 1:3-1:4, preferably 1:3.5; the temperature of the oil bath heating is 80-100° C., and the time is 25-40 min.

[0017] Preferably, the intermittent power-on mode is: first power on for 10 to 12 hours, power off for 9 to 12 hours, and then power on again for 12 to 14 hours; further preferably, the intermittent power-on mode is: first power on for 12 hours, power off for 12 hours, and then power on again for 12 hours.

[0018] Preferably, the intermittent power-on operation is to turn off the power supply after a period of power-on reaction to form a CO2 concentration difference between the anode area and the cathode area, thereby achieving the diffusion of CO2 from the anode area to the cathode area, thereby reducing the occurrence of CO2 gas crosstalk.

[0019] Preferably, electrifying the reservoir comprises electrifying the positive electrode and the negative electrode to a voltage gradient of 500-1200 V / m.

[0020] The second aspect of the present invention provides an application of the above-mentioned method of combining reservoir CO2 utilization and storage process by using electric field in the field of CO2 capture, utilization and storage.

[0021] One or more embodiments of the present invention have at least the following beneficial effects:

[0022] (1) The present invention coats the surface of the electrode with a surface hydroxylated nanocatalyst based on the consideration that in the electrochemical redox reaction, the cathode region has a low affinity for CO2 for electrocatalytic reduction, resulting in a large amount of CO2 being unable to be adsorbed and further catalytically reduced to carbonaceous substances for storage. The surface hydroxylated nanocage catalyst is designed so that the hydroxyl groups on the catalyst surface will preferentially attract CO2, thereby greatly accelerating the electrocatalytic reduction of CO2 to carbonaceous substances for storage.

[0023] Patent CN113187450A uses electrocatalysis in the injection well to form carbon-containing substances for oil displacement, and the storage efficiency is low; while the present invention first uses caged hydroxyl groups near the production well to adsorb CO2, and further accelerates the electrocatalytic CO2 reduction reaction through a catalyst to directly generate carbon-containing substances, which will greatly improve the carbon storage efficiency.

[0024] (2) The present invention uses intermittent power on and off. During this process, electrocatalytic oxidation will adsorb a large amount of CO2 near the injection well, and the amount of CO2 adsorbed in the production well is relatively small due to electrocatalytic reduction. When the power is turned off, a CO2 concentration difference will be formed near the injection well and the production well. CO2 will diffuse spontaneously through the concentration gradient, which is conducive to suppressing gas channeling.

[0025] (3) The present invention uses intermittent power supply, and the entire reservoir will continuously undergo electrocatalytic oxidation and electrocatalytic reduction reactions. A large amount of CO2 will gather near the injection well and diffuse spontaneously to the production well through the CO2 concentration difference, greatly improving the recovery rate. At the same time, in the production well, the hydroxyl-containing catalyst can accelerate the formation of carbon-containing substances from CO2, further increasing the carbon storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 Schematic diagram of the experimental process of combining reservoir CO2 utilization and storage process by using electric field in the present invention, wherein (a) is the power-on process, (b) is the intermittent power-off process, and (c) is the power-on process;

[0028] Among them, 1: reservoir; 2: injection well; 3: production well; 4: positive electrode; 5: negative electrode; 6: surface hydroxylated nanocatalyst; 7: CO2 gas;

[0029] Figure 2 This is a comparison chart of signal strength tests of the initial saturated crude oil of the present invention, Example 1, and Comparative Examples 1 to 3 under the methods involved;

[0030] Figure 3 This is a core oil displacement efficiency test diagram under the methods involved in Example 1 and Comparative Examples 1 to 3 of the present invention;

[0031] Figure 4 This is a test chart of CO2 conversion rate under the methods involved in Example 1 of the present invention and Comparative Examples 1-2. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] As mentioned above, electrochemical CO2 reduction can convert CO2 into fuels such as methanol and liquid fuel, thereby realizing alternative CO2 conversion and storage, which provides a potential direction for geological storage of CO2. However, since CO2 is a quadrupole molecule, it is more easily adsorbed by oxygen-containing functional groups, that is, it is more affinity with oxidizing environments, and is prone to CO2 gas channeling. Therefore, those skilled in the art are in urgent need of designing a method for combining reservoir CO2 utilization with storage processes using electrocatalysis.

[0034] The present invention places positive and negative electrodes in the injection well and the production well respectively, and uses the electrocatalytic oxidation of the injection well to greatly adsorb CO2; by using intermittent power outages, a CO2 concentration gradient is formed in the injection well and the production well, which promotes the movement of CO2 from the injection well to the production well by spontaneous diffusion, thereby reducing gas channeling. At the same time, an electrocatalytic reduction reaction is generated in the production well. In order to overcome the problem of insufficient efficiency of reducing CO2 to carbon-containing substances by electrocatalytic reduction at present, a cage-shaped nanocatalyst containing hydroxylation is involved, which adsorbs CO2 through hydroxylation groups, thereby improving the conversion efficiency of CO2 reducing carbon-containing substances.

[0035] The first typical embodiment of the present invention provides a method for combining the utilization and storage process of reservoir CO2 by using an electric field, specifically: placing a positive electrode and a negative electrode coated with a catalyst slurry into an injection well and a production well connected to the same interconnected well group, respectively, injecting CO2 gas into the reservoir and then energizing the reservoir, and achieving the utilization and storage of reservoir CO2 through intermittent energization.

[0036] In one or more examples of this implementation, the positive electrode and the negative electrode are both inert electrodes, and the inert electrodes are C electrodes or Pt electrodes.

[0037] In one or more examples of this embodiment, the catalyst slurry is prepared by combining a surface hydroxylated nanocatalyst with a perfluorinated resin solution (Nafion solution).

[0038] In one or more examples of this implementation, the surface hydroxylated nanocatalyst is first dissolved in an ethanol solution, and after being evenly dispersed, it is mixed with a perfluorinated resin solution to obtain a catalyst slurry; wherein the volume ratio of the ethanol solution of the surface hydroxylated nanocatalyst to the perfluorinated resin solution is 3:1.

[0039] In one or more examples of this embodiment, the surface hydroxylated nanocatalyst is selected from one or more of surface hydroxylated Cu2O and metal Cu particles, preferably surface hydroxylated Cu2O.

[0040] In one or more examples of this embodiment, the surface hydroxylated Cu2O is prepared by heating a copper salt solution and a reducing agent in an oil bath under alkaline conditions;

[0041] The copper salt solution is obtained by dissolving copper salt in ethylene glycol solution; the reducing agent is selected from one or more of sodium borohydride, ammonia borane, and glucose, preferably glucose; the alkaline condition refers to adding an alkaline solution to a mixed solution of the copper salt solution and the reducing agent, and the alkaline solution is selected from one or more of potassium bicarbonate and potassium hydroxide, preferably potassium hydroxide (KOH);

[0042] The molar ratio of the copper salt to the reducing agent is 1:3-1:4, preferably 1:3.5; the temperature of the oil bath heating is 80-100° C., and the time is 25-40 min.

[0043] In one or more embodiments of this implementation mode, the intermittent power-on method is: first power on for 10 to 12 hours, then power off for 9 to 12 hours, and then power on again for 12 to 14 hours.

[0044] In one or more examples of this implementation mode, the intermittent power-on method is: first power on for 12 hours, then power off for 12 hours, and then power on again for 12 hours.

[0045] In one or more embodiments of this implementation mode, the intermittent power-on operation is to turn off the power supply after a period of power-on reaction to form a CO2 concentration difference between the anode area and the cathode area, thereby achieving the diffusion of CO2 from the anode area to the cathode area, thereby reducing the occurrence of CO2 gas crosstalk.

[0046] In one or more examples of this implementation, electrifying the reservoir includes electrifying the positive electrode and the negative electrode to a voltage gradient of 500-1200 V / m.

[0047] A second typical implementation of the present invention provides an application of the above-mentioned method of combining reservoir CO2 utilization and storage process by using an electric field in the field of CO2 capture, utilization and storage.

[0048] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0049] Embodiment 1: This embodiment provides a method for combining reservoir CO2 utilization and storage process by using electric field, which specifically includes the following steps:

[0050] (1) Preparation of surface hydroxylated nanocatalysts

[0051] First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution, and then 800 mg of glucose was added to the above solution and stirred until the mixture was completely dissolved; then KOH aqueous solution (9 mM, 2 mL) was added dropwise to the above mixture. The resulting mixed solution was heated in a 95°C oil bath for 30 min, and the product was collected by centrifugation to finally prepare surface hydroxylated Cu2O;

[0052] (2) Take 10 mg of the copper-based nanocatalyst prepared in step (1) and disperse it evenly in 2 mL of ethanol solution by ultrasonication. Then take 1.5 mL of the dispersed Cu-based catalyst and continue ultrasonication mixing with 0.5 mL of Nafion solution to prepare a catalyst slurry. Evenly drop the catalyst slurry on the electrode surface and dry it naturally for later use.

[0053] (3) Turn on the power supply and energize the reservoir (the positive electrode and the negative electrode are placed in the injection well and the production well connected to the same interconnected well group, respectively), so that the positive and negative electrodes undergo oxidation and reduction effects under the action of the catalyst.

[0054] (4) Turn off the power supply, and a CO2 concentration zone is formed in the anode area and the cathode area. Under the effect of the CO2 concentration difference, a large amount of CO2 in the anode area gradually diffuses to the cathode area, which helps to suppress the CO2 gas channeling phenomenon;

[0055] (5) Intermittently turn the power supply on and off to achieve the CO2 utilization and storage effect in the reservoir.

[0056] Comparative Example 1: This comparative example provides a reservoir CO2 utilization and storage method, which specifically includes the following steps:

[0057] (1) Preparation of surface hydroxylated nanocatalysts

[0058] First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution, and then 800 mg of glucose was added to the above solution and stirred until the mixture was completely dissolved; then KOH aqueous solution (9 mM, 2 mL) was added dropwise to the above mixture. The resulting mixed solution was heated in a 95°C oil bath for 30 min, and the product was collected by centrifugation to finally prepare surface hydroxylated Cu2O;

[0059] (2) Take 10 mg of the copper-based nanocatalyst prepared in step (1) and disperse it evenly in 2 mL of ethanol solution by ultrasonication. Then take 1.5 mL of the dispersed Cu-based catalyst and continue ultrasonication mixing with 0.5 mL of Nafion solution to prepare a catalyst slurry. Evenly drop the catalyst slurry on the electrode surface and dry it naturally for later use.

[0060] (3) Turn on the power supply and energize the reservoir (the positive electrode and the negative electrode are placed in the injection well and the production well connected to the same interconnected well group, respectively), so that the positive and negative electrodes undergo oxidation and reduction effects under the action of the catalyst.

[0061] Comparative Example 2: This comparative example provides a reservoir CO2 utilization and storage method, which specifically includes the following steps:

[0062] (1) Preparation of surface hydroxylated nanocatalysts

[0063] First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution, and then 800 mg of glucose was added to the above solution and stirred until the mixture was completely dissolved; then KOH aqueous solution (9 mM, 2 mL) was added dropwise to the above mixture. The resulting mixed solution was heated in a 95°C oil bath for 30 min, and the product was collected by centrifugation to finally prepare surface hydroxylated Cu2O;

[0064] (2) Take 10 mg of the copper-based nanocatalyst prepared in step (1) and disperse it evenly in 2 mL of ethanol solution by ultrasonication. Then take 1.5 mL of the dispersed Cu-based catalyst and continue ultrasonication mixing with 0.5 mL of Nafion solution to prepare a catalyst slurry. Evenly drop the catalyst slurry on the electrode surface and dry it naturally for later use.

[0065] (3) Turn on the power supply and energize the reservoir (the positive electrode and the negative electrode are placed in the production well and the injection well connected to the same interconnected well group, respectively), so that the positive and negative electrodes undergo oxidation and reduction effects under the action of the catalyst.

[0066] Comparative Example 3: This comparative example provides a reservoir CO2 utilization and storage method, which specifically includes the following steps:

[0067] Adsorption of single injection CO2 in the reservoir area of ​​the mine:

[0068] The CO2 captured from the mine is transported to the wellhead through a pipeline, and then injected from the injection well through a certain pressurization equipment at the wellhead. The injected CO2 migrates toward the production well driven by the injection pressure difference. In the porous medium of the underground reservoir, part of the CO2 is adsorbed on the surface of the underground porous medium and sealed in the reservoir due to the micro-nano pores of the reservoir having a certain adsorption effect on CO2, thus achieving CO2 storage.

[0069] Test Example 1: This test example is to test the oil displacement effect of the methods involved in Example 1 and Comparative Examples 1 to 3

[0070] This test example is a related experiment carried out in the laboratory. The basic physical property parameters of the sandstone core are shown in Table 1, where the core numbers T1 to T4 correspond to Example 1 and Comparative Examples 1 to 3, respectively:

[0071] Table 1

[0072]

[0073] Since the method of calculating the oil recovery efficiency by observing the crude oil content at the outlet end is prone to inaccurate oil recovery efficiency due to reading errors, this test example uses the nuclear magnetic resonance curve area to calculate the oil recovery efficiency under the methods of Example 1 and Comparative Examples 1 to 3.

[0074] The oil recovery efficiency is calculated as:

[0075] (Initial saturated oil area - crude oil area under different injection methods) / initial saturated oil area * 100%

[0076] The intermittent power-on method is: first power on for 12 hours, then power off for 12 hours, and then power on again for 12 hours, so that the total power-on time is 24 hours, which is convenient for comparison with other methods.

[0077] like Figure 2 As shown, crude oil contains hydrogen nuclei, so in the core saturated crude oil, the signal intensity can represent the content of crude oil. The signal intensity forms the nuclear magnetic area. The larger the nuclear magnetic area, the more crude oil content in the pores. It can be seen that the initial saturated oil signal intensity is 215328, and the signal intensity of Example 1 of the present invention is 67160, which is 148168 lower than the initial saturated oil; and compared with the signal intensity of Comparative Examples 1 to 3 (88693, 100149 and 111604 respectively), compared with the initial saturated oil, it is reduced by (126635, 115179 and 103724). It can be seen that the signal intensity of Example 1 of the present invention is the lowest, indicating that the oil displacement effect of Example 1 is the best.

[0078] like Figure 3 As shown, it can be seen from the oil recovery efficiency that the oil recovery efficiency of comparative example 1 is 58.81%, the oil recovery efficiency of comparative example 2 is 53.49%, and the oil recovery efficiency of comparative example 3 is 48.17%. The oil recovery efficiency of embodiment 1 of the present invention (the positive electrode is injected into the well and intermittently energized) is greatly improved, which is 68.81%.

[0079] Test Example 2: This test example is to test the CO2 conversion rate effect of the methods involved in Example 1 and Comparative Examples 1-2

[0080] Experimental process: The contents of methanol, formic acid and other substances were detected at the outlet to further study the CO2 conversion rate of electrocatalytic reduction.

[0081] like Figure 4 As shown, it was found that the CO2 conversion rate of comparative example 2 was 26.72%, the CO2 conversion rate of comparative example 1 was 58.15%, and the CO2 conversion rate of embodiment 1 of the present invention was 67.83%. It can be seen that when the positive electrode is in the injection well and a surface hydroxylated catalyst is used, the CO2 conversion rate can be greatly increased, and the full process of CO2 utilization and storage can be realized by intermittent power supply.

[0082] As described above, the present invention forms a CO2 concentration difference between the anode area and the cathode area through the method of intermittent power outage, driving CO2 to continuously expand to the cathode area. At the same time, the cathode area continuously generates liquid fuel under the action of electrocatalytic CO2 reduction, thereby achieving the purpose of improving the recovery rate and alternative CO2 storage.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for combining reservoir CO2 utilization and storage process by using electric field, characterized in that: Specifically, the positive electrode and the negative electrode coated with the catalyst slurry are placed in the injection well and the production well connected to the same interconnected well group, and the reservoir is electrified after the CO2 gas is injected into the reservoir. Through intermittent electrification, the utilization and storage of the reservoir CO2 is realized; The catalyst slurry is prepared by combining a surface hydroxylated nanocatalyst with a perfluorinated resin solution; The surface hydroxylated nanocatalyst is surface hydroxylated modified Cu2O; The intermittent power-on operation is to turn off the power supply after a period of power-on reaction to form a CO2 concentration difference between the anode area and the cathode area, thereby achieving the diffusion of CO2 from the anode area to the cathode area, thereby reducing the occurrence of CO2 gas crossover.

2. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 1, characterized in that: The positive electrode and the negative electrode are both inert electrodes, and the inert electrodes are C electrodes or Pt electrodes.

3. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 1, characterized in that: The surface hydroxylated nanocatalyst is first dissolved in an ethanol solution, and after being evenly dispersed, it is mixed with a perfluorinated resin solution to obtain a catalyst slurry; wherein the volume ratio of the ethanol solution of the surface hydroxylated nanocatalyst to the perfluorinated resin solution is 3:

1.

4. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 1, characterized in that: The surface hydroxylated Cu2O is prepared by heating a copper salt solution and a reducing agent in an oil bath under alkaline conditions.

5. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 4, characterized in that: The copper salt solution is obtained by dissolving copper salt in ethylene glycol solution; the reducing agent is selected from one or more of sodium borohydride, ammonia borane, and glucose; the alkaline condition refers to adding an alkaline solution to a mixed solution of the copper salt solution and the reducing agent, and the alkaline solution is selected from one or more of potassium bicarbonate and potassium hydroxide; The mass ratio of the copper salt to the reducing agent is 1:3-1:4; the temperature of the oil bath heating is 80-100° C., and the heating time is 25-40 min.

6. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 1, characterized in that: The intermittent power-on method is: first power on for 10 to 12 hours, then power off for 9 to 12 hours, and then power on again for 12 to 14 hours.

7. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 1, characterized in that: The reservoir is electrified including: electrifying the positive electrode and the negative electrode until the voltage gradient is 500-1200 V / m.

8. Application of the method for combining reservoir CO2 utilization and storage process by using electric field as described in any one of claims 1 to 7 in the field of CO2 capture, utilization and storage.

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