Method for realizing combination of reservoir CO2 utilization and storage flow by utilizing electric field

Abstract

The invention belongs to the technical field of capture, utilization and storage of unconventional reservoir CO2, and particularly relates to a method for realizing combination of reservoir CO2 utilization and storage flow by utilizing an electric field. The positive electrode and the negative electrode are placed in the injection well and the production well correspondingly, and CO2 is greatly adsorbed through electrocatalytic oxidation of the injection well; and the CO2 concentration gradient is formed in the injection well and the production well through intermittent power failure, CO2 is promoted to move from the injection well to the production well in a spontaneous diffusion mode, and gas channeling is reduced. Meanwhile, an electrocatalytic reduction reaction is generated in a production well, in order to solve the problem that the efficiency of reducing CO2 into carbonaceous substances through electrocatalytic reduction at present is insufficient, a hydroxylation-containing nano-catalyst is involved, and CO2 is adsorbed through hydroxylation groups, so that the conversion efficiency of reducing the carbonaceous substances through CO2 is improved. According to the method, the utilization and storage efficiency of CO2 can be improved, the recovery efficiency of the oil reservoir is improved, energy safety is guaranteed, and emission of greenhouse gas is reduced.

Description

Technical Field

[0001] The present invention belongs to unconventional reservoir CO 2 The field of capture, utilization and storage technology specifically relates to a method of using electric field to realize reservoir CO 2 Utilize an approach that is integrated with the containment process. 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) technology has attracted widespread attention in the oil industry. 2 Injected into the reservoir, using CO 2 The adsorption advantage of crude oil or gas is to extract crude oil and gas and convert CO 2 Seal it into the reservoir to increase the recovery rate. In this process, how can we give full play to the role of injected CO 2 The role of CO and how to store CO efficiently 2 This is the focus of CCUS technology. 2 The role is to utilize CO 2 The adsorption advantage of crude oil and gas can improve the recovery rate, and the CO2 can be stored efficiently. 2 To achieve CO 2 Storage in the strata.

[0004] Typically, CO is injected into the wellbore 2 Gas channeling is prone to occur. Currently, technicians use different chemical reagents to reduce CO 2 The viscosity of the crude oil can be increased to suppress gas channeling, but the use of chemical reagents will incur a certain investment cost, and the chemical reagents and crude oil are not easily separated.

[0005] At the same time, there are patents and related research showing that electrochemical CO 2 Reduction can reduce CO 2 Convert CO into methanol and other fuels 2 Converting into liquid fuels to achieve alternative CO 2 Conversion and storage, which is CO 2 Geological storage provides a potential direction.

[0006] For example, patent CN113187450A provides a CO 2The electro-reduction storage and oil recovery method 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, with an oxidation reaction at the positive electrode and a reduction reaction at the negative electrode. Therefore, a reduction reaction occurs in the injection well to generate target products such as methanol, but this method ignores CO 2 The injection well undergoes a reduction reaction, and although some methanol will be produced, due to the CO 2 It is a quadrupole molecule and is more easily adsorbed by oxygen-containing functional groups, that is, it is more friendly to oxidizing environments. 2 Convert to target product to achieve CO 2 storage, but CO 2 Electrochemical reduction to form alternative CO 2 The efficiency of the additional products is not high, and a large amount of CO 2 It will escape and easily form gas channeling in the reservoir, which is not conducive to CO 2 Therefore, there is an urgent need for a method to realize the storage of reservoir CO by electrocatalysis. 2 The above problems are solved by combining the method with the sealing process. Summary of the invention

[0007] In view of the above problems, the present invention aims to provide a method for realizing reservoir CO 2 The present invention uses a concentration field difference permeation method formed by electrocatalytic oxidation to reduce CO 2 The impact of gas channeling further increases CO 2 The role of developing oil and gas resources, while using hydroxyl-containing cage catalysts to adsorb CO through surface hydroxyl groups 2 Further electroreduction of CO is achieved near the cathode area of ​​the wellbore 2 effect, thereby accelerating CO 2 Converting fuel liquids to achieve alternative storage provides a solid foundation for the efficient development of CCUS technology in reservoirs.

[0008] Specifically, the present invention provides the following technical solutions: The first aspect of the present invention provides a method for realizing reservoir CO by using an electric field. 2 The method combined with the sealing process is as follows: 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 CO is injected into the reservoir. 2 The reservoir is electrified after the gas is generated, and the reservoir CO is realized through intermittent electrification. 2 Utilization and storage.

[0009] Preferably, the positive electrode and the negative electrode are both inert electrodes, and the inert electrodes are C electrodes or Pt electrodes.

[0010] Preferably, the catalyst slurry is prepared by combining a surface hydroxylated nanocatalyst with a perfluorinated resin solution (Nafion solution).

[0011] 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.

[0012] Further preferably, the surface hydroxylated nanocatalyst is selected from Cu 2 O, one or more of metal Cu particles, preferably Cu particles with surface hydroxylation modification 2 O.

[0013] Further preferably, the surface hydroxylated Cu 2 O is prepared by heating a copper salt solution and a reducing agent in an oil bath under alkaline conditions; 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); 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.

[0014] 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.

[0015] Preferably, the intermittent power-on operation is to turn off the power supply after a period of power-on reaction so that CO is formed in the anode region and the cathode region. 2 concentration difference, thereby achieving CO 2 diffuses to the cathode area, thereby reducing CO 2 The occurrence of gas channeling.

[0016] Preferably, electrifying the reservoir comprises electrifying the positive electrode and the negative electrode to a voltage gradient of 500-1200 V / m.

[0017] In a second aspect of the present invention, there is provided a method for realizing reservoir CO by utilizing electric field. 2 Using methods integrated with storage processes to2 Applications in the field of capture, utilization and storage.

[0018] One or more embodiments of the present invention have at least the following beneficial effects: (1) The present invention coats the surface of the electrode with a surface hydroxylated nanocatalyst based on the electrochemical redox reaction process. 2 The affinity is not high, resulting in a large amount of CO 2 Considering that CO cannot be adsorbed and further catalytically reduced to carbonaceous substances for storage, a nanocage catalyst with surface hydroxylation is designed. The hydroxyl groups on the catalyst surface will preferentially attract CO 2 , thus significantly accelerating CO 2 Electrocatalytic reduction to carbon-containing substances for storage purpose.

[0019] Patent CN113187450A uses electrocatalysis in the injection well to form carbonaceous substances for oil displacement, but the sealing efficiency is low; while the present invention first uses caged hydroxyl groups near the production well to absorb CO 2 , further accelerating the electrocatalytic CO 2 The reduction reaction directly generates carbon-containing substances, which will greatly improve the carbon sequestration efficiency.

[0020] (2) The present invention uses intermittent opening and closing of the power supply. During this process, the electrocatalytic oxidation will absorb a large amount of CO near the injection well. 2 , due to electrocatalytic reduction of CO 2 The adsorption capacity is small. When the power is turned off, CO2 will be formed near the injection well and the production well. 2 Concentration difference, CO 2 Spontaneous diffusion through concentration gradient is beneficial to suppress gas channeling.

[0021] (3) The present invention adopts intermittent power supply, and the entire reservoir will continuously undergo electrocatalytic oxidation and electrocatalytic reduction reactions, and a large amount of CO 2 Accumulated near the injection well, through CO 2 The concentration difference diffuses spontaneously to the production well, greatly improving the recovery rate. At the same time, in the production well, the hydroxyl-containing catalyst can accelerate the CO 2 Form carbon-containing substances, further increasing the carbon storage capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 The present invention utilizes electric field to realize the formation CO2 Schematic diagram of the experimental process combined with the sealing process, where (a) is the power-on process, (b) is the intermittent power-off process, and (c) is the re-power-on process; Among them, 1: reservoir; 2: injection well; 3: production well; 4: positive electrode; 5: negative electrode; 6: surface hydroxylated nanocatalyst; 7: CO 2 gas; 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; 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; Figure 4 CO is the CO used in the methods of Example 1 and Comparative Examples 1 to 2 of the present invention. 2 Conversion rate test chart. DETAILED DESCRIPTION

[0024] 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.

[0025] As mentioned above, electrochemical CO 2 Reduction can reduce CO 2 Convert CO into methanol and other fuels 2 Converting into liquid fuels to achieve alternative CO 2 Conversion and storage, which is CO 2 Geological storage provides a potential direction, but due to the 2 It is a quadrupole molecule, which is more easily adsorbed by oxygen-containing functional groups, that is, it is more friendly to oxidizing environments and is easy to produce CO 2 Therefore, those skilled in the art are in urgent need of designing a method for realizing the gas channeling phenomenon of reservoir CO by electrocatalysis. 2 Utilize an approach that is integrated with the containment process.

[0026] The present invention places positive and negative electrodes in the injection well and the production well respectively, and utilizes the electrocatalytic oxidation of the injection well to significantly absorb CO 2 ; Use intermittent power outages to form CO in the injection well and production well 2 The concentration gradient causes CO 2 Through spontaneous diffusion from the injection well to the production well, gas channeling is reduced. At the same time, an electrocatalytic reduction reaction occurs in the production well. In order to overcome the current electrocatalytic reduction of CO 2 The problem of insufficient efficiency in reducing to carbonaceous substances involves cage-like nanocatalysts containing hydroxylated groups, which adsorb CO through hydroxylated groups.2 , thereby increasing CO 2 Conversion efficiency of reducing carbonaceous materials.

[0027] The first typical embodiment of the present invention provides a method for realizing reservoir CO by using an electric field. 2 The method combined with the sealing process is as follows: 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 CO is injected into the reservoir. 2 The reservoir is electrified after the gas is generated, and the reservoir CO is realized through intermittent electrification. 2 Utilization and storage.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] In one or more examples of this embodiment, the surface hydroxylated nanocatalyst is selected from Cu 2 O, one or more of metal Cu particles, preferably Cu particles with surface hydroxylation modification 2 O.

[0032] In one or more examples of this embodiment, the surface hydroxylated Cu 2 O is prepared by heating a copper salt solution and a reducing agent in an oil bath under alkaline conditions; 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); 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.

[0033] 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.

[0034] 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.

[0035] In one or more embodiments of this embodiment, the intermittent power-on operation is to turn off the power supply after a period of power-on reaction so that the anode region and the cathode region form CO 2 concentration difference, thereby achieving CO 2 diffuses to the cathode area, thereby reducing CO 2 The occurrence of gas channeling.

[0036] 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.

[0037] A second typical embodiment of the present invention provides a method for realizing the above-mentioned CO2 reservoir by using an electric field. 2 Using methods integrated with storage processes to 2 Applications in the field of capture, utilization and storage.

[0038] 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.

[0039] Example 1: This example provides a method for realizing reservoir CO 2 The method combined with the sealing process includes the following steps: (1) Preparation of surface hydroxylated nanocatalysts First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution. 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 Cu 2 O; (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. (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.

[0040] (4) Turn off the power supply and form CO in the anode and cathode regions. 2 Concentration band, in CO 2 Under the action of concentration difference, a large amount of CO 2 Gradually diffuses to the cathode area, helping to suppress CO 2 Gas channeling phenomenon; (5) Intermittently turn on and off the power supply to achieve reservoir CO 2 Utilization and storage effects.

[0041] Comparative Example 1: This comparative example provides a reservoir CO 2 The utilization and sealing method specifically comprises the following steps: (1) Preparation of surface hydroxylated nanocatalysts First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution. 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 Cu 2 O; (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. (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.

[0042] Comparative Example 2: This comparative example provides a reservoir CO 2 The utilization and sealing method specifically comprises the following steps: (1) Preparation of surface hydroxylated nanocatalysts First, 261 mg of copper acetate was completely dissolved in 120 mL of ethylene glycol (EG) to form a blue solution. 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 Cu 2 O; (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. (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.

[0043] Comparative Example 3: This comparative example provides a reservoir CO 2 The utilization and sealing method specifically comprises the following steps: Single CO injection in the reservoir area of ​​the mine 2 Adsorption: CO2 captured from the mine 2 It is transported to the wellhead through pipelines, where it is pressurized by certain boosting equipment. 2 Injected from the injection well, the injected CO 2 Driven by the injection pressure difference, it migrates toward the production well. In the porous medium of the underground reservoir, the micro-nano pores of the reservoir are sensitive to CO 2 There is a certain adsorption effect, some CO 2 It is adsorbed on the surface of underground porous media and sealed in the reservoir, achieving CO 2 Archive.

[0044] 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 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: Table 1

[0045] 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.

[0046] The oil recovery efficiency is calculated as: (Initial saturated oil area - crude oil area under different injection methods) / initial saturated oil area * 100% 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.

[0047] 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.

[0048] 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%.

[0049] Test Example 2: This test example is to conduct CO 2 Conversion rate effect detection Experimental process: The content of methanol, formic acid and other substances was detected at the outlet to further study the electrocatalytic reduction of CO 2 Conversion rate.

[0050] like Figure 4 As shown, it was found that CO 2 The conversion rate was 26.72%, while the CO 2 The conversion rate was 58.15%, while the CO 2 The conversion rate is 67.83%, which shows that when the positive electrode is in the injection well and the surface hydroxylated catalyst is used, CO 2 The conversion rate is greatly increased, and CO can be achieved by intermittent power supply.2 The entire process of utilization and storage.

[0051] As described above, the present invention forms CO in the anode region and the cathode region by intermittently cutting off the power. 2 The concentration difference drives CO 2 The cathode region is continuously extended to the cathode region. At the same time, the cathode region is electrocatalyzing CO 2 Liquid fuel is continuously generated under the action of reduction, achieving the goal of improving oil recovery and CO 2 Alternative storage purpose.

[0052] 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 negative electrode coated with catalyst slurry are respectively placed in the injection well and production well connected to the same interconnected well group, and the reservoir is energized after CO2 gas is injected into the reservoir. Through intermittent energization, the utilization and storage of CO2 in the reservoir are achieved.

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 catalyst slurry is prepared by compounding a surface hydroxylated nano catalyst with a perfluorinated resin solution.

4. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 3, 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.

5. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 3, characterized in that: The surface hydroxylated nanocatalyst is selected from one or more of surface hydroxylated Cu2O and metal Cu particles.

6. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 5, 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.

7. The method of combining reservoir CO2 utilization and storage process by using electric field as claimed in claim 6, 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.

8. 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; 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.

9. 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.

10. 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 9 in the field of CO2 capture, utilization and storage.

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