Anti-CO2 gas channeling plugging composition and anti-CO2 gas channeling plugging agent

Abstract

The invention provides a blocking composition for resisting CO2 gas channeling and a blocking agent for resisting CO2 gas channeling. The plugging composition for resisting CO2 gas channeling comprises the following components in parts by weight: 90 to 100 parts of cement, 90 to 100 parts of epoxy resin, 15 to 20 parts of acrylonitrile, 25 to 35 parts of a curing agent, 15 to 20 parts of a diluent and 0.01 to 0.1 part of an initiator. Wherein acrylonitrile initiates bulk polymerization through an initiator, a C = N bond of the formed polyacrylonitrile is subjected to acidic hydrolysis in a low-pH environment to generate polyacrylic acid, the polyacrylic acid and epoxy resin are subjected to a ring-opening reaction, and a formed three-dimensional network structure polymer and cement are mutually interspersed; the overall cohesiveness, temperature resistance, strength, toughness, stability, acid resistance and pressure resistance of the blocking agent for resisting CO2 gas channeling are improved, so that a good channeling blocking effect in a CO2 flooding well is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of CO 2 oil displacement, and more particularly, relates to a CO 2 gas breakthrough prevention plugging composition and a CO 2 gas breakthrough prevention plugging agent. Background Art

[0002] With the increasing demand for energy, the reserves of traditional oil fields can no longer meet the needs of society. Therefore, the development of unconventional oil reservoirs has become a key point. The reserves of low-permeability oil reservoirs in China are abundant, but conventional methods cannot economically and effectively develop them. CO 2 oil displacement technology has been widely developed due to its more obvious recovery efficiency and its suitability for the development of low-permeability oil reservoirs and block oil production. However, the early breakthrough of gas or gas channeling during CO 2 oil displacement has become a common problem restricting the gas flooding process in oil reservoirs. Since the viscosity of CO 2 is very low and its density is also lower than that of oil and water under general oil reservoir conditions, viscous fingering and gravity override may occur in the formation. Viscous fingering causes the injected CO 2 to bypass the displaced oil phase and flow through, resulting in unstable displacement and reduced sweep efficiency. The gas tends to flow through in formations with high permeability and high water saturation, preferential channels, and other large hydraulic fracturing fractures, reducing the utilization rate of CO 2 and the oil-water recovery rate. Therefore, in view of the formation of relatively wide breakthrough channels in large fractures and large pores in the formation, it is urgent to study a CO 2 gas breakthrough prevention plugging agent to solve the above problems. At present, the use of cement and gel particles for plugging during water flooding has been widely applied, achieving good on-site effects and experience, but its application effect in the acidic environment of high-temperature and high-pressure CO 2 oil displacement has rarely been reported.

[0003] For example, a Chinese patent application with the patent application number 201610710880.0 discloses a plugging agent for geological exploration and its preparation method, which is made from the following raw materials: sulfoaluminate cement, slag powder, condensed silica fume, calcium sulfoaluminate powder, magnesium aluminum silicate, and sodium hexametaphosphate. This plugging agent can solidify quickly, has a large volume expansion during the solidification process, firmly bonds with the rock formation, and the solidified body has a high strength, with a strength of up to 0.5 - 1 MPa within 1 day and up to 2 - 3 MPa within 7 days. It has a good plugging effect, is convenient and safe to use, and is non-toxic, harmless, and pollution-free. A Chinese patent application with the patent application number 201910510290.7 discloses a resin plugging agent for repairing cement annulus cracks and its preparation method, which is made from the following raw materials: methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate, viscosity regulator, crosslinking agent, and crosslinking regulator. This invention can achieve effective injection, has a low viscosity, is convenient to inject, safe to operate, and has a good plugging property. However, neither of the above two plugging agents is suitable for oil wells with acid resistance and impermeability requirements. Summary of the Invention

[0004] The main object of the present invention is to provide an anti-CO 2 gas escape plugging composition and an anti-CO 2 gas escape plugging agent to solve the problem of poor acid resistance and impermeability of the plugging agent in CO 2 flooding oil wells in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an anti-CO 2 gas escape plugging composition. By weight, the anti-CO 2 gas escape plugging composition includes: 90 - 100 parts of cement, 90 - 100 parts of epoxy resin, 15 - 20 parts of acrylonitrile, 25 - 35 parts of curing agent, 15 - 20 parts of diluent, and 0.01 - 0.1 part of initiator.

[0006] Further, the mass ratio of the above epoxy resin to acrylonitrile is 5 - 6:1.

[0007] Further, the mass ratio of the above epoxy resin to diluent is 4.5 - 5.5:1.

[0008] Further, the above anti-CO 2 gas escape plugging composition further includes 1 - 5 parts of coupling agent.

[0009] Further, the above coupling agent is selected from any one or more of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, vinyltriethoxysilane, and γ-aminopropyltriethoxysilane.

[0010] Further, the above-mentioned epoxy resin is selected from any one or more of waterborne epoxy resin, glue-curing epoxy resin, and solvent-based epoxy resin; preferably, the waterborne epoxy resin is selected from any one or more of E-44, E-52, and E-58; preferably, the glue-curing epoxy resin is selected from any one or more of EP-301, Epoxy510, and EP-616; preferably, the solvent-based epoxy resin is selected from any one or more of NPSN-301X75, YN2301X75, and BE-188.

[0011] Further, the above-mentioned curing agent is selected from any one or more of ethylenediamine, polyamide, and m-phenylenediamine.

[0012] Further, the above-mentioned diluent is selected from any one or more of ethanol, acetone, and benzene.

[0013] Further, the above-mentioned initiator is selected from any one or more of azobisisobutyronitrile, benzoyl peroxide, and ammonium persulfate.

[0014] According to another aspect of the present invention, there is provided an anti-CO 2 gas escape plugging agent, which is prepared by mixing a plugging composition, and the plugging composition is the aforementioned anti-CO 2 gas escape plugging composition.

[0015] Applying the technical solution of the present application, the diluent of the present invention ensures the low viscosity of the anti-CO 2 gas escape plugging agent during ground preparation, so that the anti-CO 2 gas escape plugging agent has high fluidity, so that the anti-CO 2 gas escape plugging agent can be extruded into pores that cannot be reached by traditional cement particles, providing good injection performance for the anti-CO 2 gas escape plugging agent. After the anti-CO 2 gas escape plugging agent enters the formation fracture, with the increase of the formation temperature, acrylonitrile monomer initiates bulk polymerization through the initiator to form a long-chain polymer; the low pH environment formed after gas channeling of CO 2 in the fracture causes the C≡N bond in the cross-linked high-molecular polyacrylonitrile to undergo acid hydrolysis to generate polyacrylic acid, and the polyacrylic acid undergoes a ring-opening reaction with the added epoxy resin to form a three-dimensional network structure polymer. The three-dimensional network structure polymer and cement interpenetrate each other, improving the overall adhesion, temperature resistance, and compressive strength of the anti-CO 2 gas escape plugging agent. In addition, the strong hydrophilic structure contained in acrylonitrile enables the anti-CO 2 gas escape plugging agent to be uniformly mixed, reducing the cracking of the anti-CO 2 gas escape plugging agent and having good toughness. Thus, the above-mentioned anti-CO 2Anti-CO obtained from gas channeling plugging composition 2 The gas channeling plugging agent has high strength, toughness, stability and acid resistance, thereby achieving good plugging effect of gas channeling in CO flooding wells. 2 Specific embodiments

[0016] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0017] As analyzed in the background art of the present application, in the prior art, the plugging agent in CO flooding wells has problems of poor acid resistance and anti-seepage performance. To solve this problem, the present application provides an anti-CO gas channeling plugging composition and an anti-CO gas channeling plugging agent. 2 2 2

[0018] In a typical embodiment of the present application, an anti-CO gas channeling plugging composition is provided. By weight, the anti-CO gas channeling plugging composition includes: 90-100 parts of cement, 90-100 parts of epoxy resin, 15-20 parts of acrylonitrile, 25-35 parts of curing agent, 15-20 parts of diluent, and 0.01-0.1 part of initiator. 2 2

[0019] The diluent of the present invention ensures the low viscosity of the anti-CO gas channeling plugging agent during ground preparation, making the anti-CO gas channeling plugging agent have high fluidity, so that the anti-CO gas channeling plugging agent can be extruded into pores that traditional cement particles cannot reach, providing good injection performance for the anti-CO gas channeling plugging agent. After the anti-CO gas channeling plugging agent enters the formation fracture, with the increase of the formation temperature, acrylonitrile monomer is initiated by the initiator to carry out bulk polymerization to form long-chain polymer; the low pH environment formed after gas channeling of CO gas in the fracture causes the C≡N bond in the cross-linked high molecular polyacrylonitrile to undergo acid hydrolysis to generate polyacrylic acid, and the polyacrylic acid undergoes a ring-opening reaction with the added epoxy resin to form a three-dimensional network structure polymer. The three-dimensional network structure polymer and the cement interpenetrate each other, improving the overall adhesion, temperature resistance and compressive strength of the anti-CO gas channeling plugging agent. In addition, the strong hydrophilic structure contained in acrylonitrile makes the anti-CO gas channeling plugging agent evenly mixed, reducing the... 2 2 2 2 2 2 2 2 2 ​​​​​​​​​​​​​​The gas escape plugging agent cracks and has good toughness. Thus, the anti-CO 2 gas escape plugging composition obtained has an anti-CO 2 gas escape plugging agent with high strength, toughness, stability and acid resistance, thereby achieving good plugging effect of gas channeling in CO 2 flooding wells.

[0020] In one embodiment of the present application, the mass ratio of the above-mentioned epoxy resin to acrylonitrile is 5-6:1.

[0021] Preferably, the mass of the epoxy resin and acrylonitrile is within the above range, which helps to improve the synergistic cooperation between the two, so that the cross-linking effect of the epoxy resin and polyacrylic acid (formed by acid hydrolysis after self-polymerization of acrylonitrile) is better, and the three-dimensional network structure polymer generated can better interpenetrate with the cement, thereby improving the overall adhesion, temperature resistance and compressive strength of the anti-CO 2 gas escape plugging agent.

[0022] In one embodiment of the present application, the mass ratio of the above-mentioned epoxy resin to the diluent is 4.5-5.5:1.

[0023] The diluent ensures the low viscosity of the anti-CO 2 gas escape plugging agent during ground preparation. Preferably, adding the mass ratio of the epoxy resin to the diluent within the above range helps to improve the fluidity of the epoxy resin, thereby improving the overall injection performance of the anti-CO 2 gas escape plugging agent.

[0024] In one embodiment of the present application, the above-mentioned anti-CO 2 gas escape plugging composition further includes 1-5 parts of coupling agent.

[0025] Adding too much coupling agent will cause the mechanical properties of the anti-CO 2 gas escape plugging agent to decline. Adding too little coupling agent cannot play a role in improving the interfacial properties between the epoxy resin and the cement filler. Preferably, adding the coupling agent in the anti-CO 2 gas escape plugging composition within the above range enables the anti-CO 2 gas escape plugging agent to have good adhesion and processing performance, which helps to improve the plugging effect.

[0026] To further improve the interfacial properties between the epoxy resin and the cement filler, in one embodiment of the present application, preferably, the above-mentioned coupling agent is selected from any one or more of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane. In addition, the present application further preferably uses N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane.

[0027] To improve the synergistic effect between epoxy resin and other compositions, in one embodiment of the present application, it is preferred that the above-mentioned epoxy resin is selected from any one or more of waterborne epoxy resin, glue-curing epoxy resin, and solvent-based epoxy resin; preferably, the waterborne epoxy resin is selected from any one or more of E-44, E-52, and E-58; preferably, the glue-curing epoxy resin is selected from any one or more of EP-301, Epoxy510, and EP-616; preferably, the solvent-based epoxy resin is selected from any one or more of NPSN-301X75, YN2301X75, and BE-188. In addition, the present application further preferably uses glue-curing epoxy resin.

[0028] In one embodiment of the present application, the above-mentioned curing agent is selected from any one or more of ethylenediamine, polyamide, and m-phenylenediamine.

[0029] The curing agent strengthens the connection strength between polyacrylonitrile, epoxy resin and cement. Preferably, the above-mentioned curing agent is beneficial to improving the connection strength between polyacrylonitrile, epoxy resin and cement. In addition, the present application further preferably uses ethylenediamine.

[0030] To reduce the viscosity of the anti-CO 2 gas escape plugging agent, in one embodiment of the present application, it is preferred that the above-mentioned diluent is selected from any one or more of ethanol, acetone, and benzene. In addition, the present application further preferably uses ethanol.

[0031] In one embodiment of the present application, the above-mentioned initiator is selected from any one or more of azobisisobutyronitrile, benzoyl peroxide, and ammonium persulfate.

[0032] The initiator initiates the bulk polymerization of acrylonitrile monomer to form a long-chain polymer. Preferably, the above-mentioned type of initiator helps to improve the polymerization reaction efficiency.

[0033] In another typical embodiment of the present application, an anti-CO 2 gas escape plugging agent is provided, which is prepared by mixing a plugging composition, and the plugging composition is the aforementioned anti-CO 2 gas escape plugging composition.

[0034] The anti-CO 2 gas escape plugging agent prepared by mixing the aforementioned plugging composition has high adhesiveness, heat resistance, strength, toughness, stability, acid resistance and compressive resistance, so as to achieve good plugging effect in CO 2 flooding wells.

[0035] The beneficial effects of the present application will be further described below in conjunction with examples.

[0036] Example 1

[0037] Preparation by parts by weight of components: Take 15 parts of ethanol and add it to 90 parts of Epoxy510. After mixing evenly, slowly add 25 parts of ethylenediamine. Finally, add 90 parts of cement, 2 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 15 parts of acrylonitrile, and 0.03 part of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0038] Example 2

[0039] Preparation by parts by weight of components: Take 17 parts of ethanol and add it to 90 parts of Epoxy510. After mixing evenly, slowly add 30 parts of ethylenediamine. Finally, add 90 parts of cement, 4 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 17 parts of acrylonitrile, and 0.01 part of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0040] Example 3

[0041] Preparation by parts by weight of components: Take 20 parts of ethanol and add it to 90 parts of Epoxy510. After mixing evenly, slowly add 35 parts of ethylenediamine. Finally, add 90 parts of cement, 5 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 20 parts of acrylonitrile, and 0.1 part of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0042] Example 4

[0043] Preparation by parts by weight of components: Take 15 parts of ethanol and add it to 90 parts of Epoxy510. After mixing evenly, slowly add 25 parts of ethylenediamine. Finally, add 90 parts of cement, 2 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 20 parts of acrylonitrile, and 0.05 part of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0044] Example 5

[0045] Preparation by parts by weight of components: Take 15 parts of ethanol and add it to 100 parts of Epoxy510. After mixing evenly, slowly add 25 parts of ethylenediamine. Finally, add 90 parts of cement, 2 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 15 parts of acrylonitrile, and 0.07 part of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0046] Example 6

[0047] Preparation by parts by weight of components: Take 15 parts of ethanol and add it to 90 parts of Epoxy510. After mixing evenly, slowly add 25 parts of ethylenediamine. Finally, add 100 parts of cement, 2 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, 15 parts of acrylonitrile, and 0.09 parts of benzoyl peroxide to obtain an anti-CO 2 gas escape plugging agent.

[0048] Example 7

[0049] The difference from Example 4 is that the mass ratio of epoxy resin to acrylonitrile is 5:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0050] Example 8

[0051] The difference from Example 4 is that the mass ratio of epoxy resin to acrylonitrile is 5.5:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0052] Example 9

[0053] The difference from Example 4 is that the mass ratio of epoxy resin to acrylonitrile is 6:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0054] Example 10

[0055] The difference from Example 4 is that the mass ratio of epoxy resin to ethanol is 5:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0056] Example 11

[0057] The difference from Example 4 is that the mass ratio of epoxy resin to ethanol is 5.5:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0058] Example 12

[0059] The difference from Example 4 is that the mass ratio of epoxy resin to ethanol is 6:1, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0060] Example 13

[0061] The difference from Example 4 is that the coupling agent (N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane) is not added, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0062] Example 14

[0063] The difference from Example 4 is that the diluent is benzene, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0064] Example 15

[0065] The difference from Example 4 is that the epoxy resin is NPSN-301X75, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0066] Example 16

[0067] The difference from Example 4 is that the curing agent is polyamide, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0068] Example 17

[0069] The difference from Example 4 is that the coupling agent is vinyltriethoxysilane, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0070] Example 18

[0071] The difference from Example 4 is that the initiator is azobisisobutyronitrile, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0072] Comparative Example 1

[0073] The difference from Example 4 is that acrylonitrile is not added, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0074] Comparative Example 2

[0075] The difference from Example 4 is that the amount of acrylonitrile is 5 parts, and finally an anti-CO 2 gas escape plugging agent is obtained.

[0076] In order to characterize the various properties of the pH-triggered anti-CO 2 gas escape plugging agent, the plugging property, compressive strength, bond strength, temperature resistance, acid resistance and anti-seepage strength of the anti-CO 2 gas escape plugging agent prepared in the examples and comparative examples were tested respectively, and the test results are shown in Table 1.

[0077] 1. Plugging performance test

[0078] An indoor sand-packed tube simulation experiment was adopted. The diameter of the single-tube sand-packed tube was 3.0 cm and the length was 40.0 cm. The sand-packed tube was pressed with quartz sand of different particle sizes. First, the CO 2 gas displacement permeability of the sand-packed tube without adding the anti-CO 2 gas escape plugging agent was measured, and then the prepared anti-CO2 The gas escape plugging agent solution was injected into the sand-packed tube and kept at a constant temperature of 80 °C for 48 h, and then CO 2 was used for displacement to measure the permeability of the sand-packed tube. The test results are shown in Table 1.

[0079] 2. Compressive strength test

[0080] The test was carried out in accordance with the compressive strength test standard specification in JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortars". The prepared anti-CO 2 gas escape plugging agent slurry was poured into a weighing densitometer to measure the density, and then the prepared anti-CO 2 gas escape plugging agent slurry was poured into a mold to make a 25×25 mm cylindrical module. After curing in a water bath at 80 °C, 120 °C and 180 °C for 10 d, it was demolded and the compressive strength was tested on a universal material testing device. The test results are shown in Table 1.

[0081] 3. Bond strength test

[0082] The interfacial shear strength experiment was carried out in accordance with GB / T 31541-2015 "Test Method for Interfacial Tensile and Shear Bonding Strength of Fine Ceramics - Cross Method". The loading speed was 0.5 mm / min, and the compressive load was applied uniformly until the bonding surface (area: 4 mm×4 mm) was damaged. The bonding strength at the time of interface fracture was recorded. The test results are shown in Table 1.

[0083] 4. Heat resistance test

[0084] The relationship between the plugging rate and the experimental time (10 d, 20 d, 30 d) was established to evaluate the heat resistance of the anti-CO 2 gas escape plugging agent. The test results are shown in Table 1.

[0085] 5. Acid resistance test

[0086] The dried anti-CO 2 gas escape plugging agent was immersed in an acid solution with pH = 3 and sealed. After being placed in a water bath at 180 °C for 24 h, its acid resistance was evaluated. The test results are shown in Table 1.

[0087] 6. Impermeability test

[0088] The test was carried out in accordance with the standard specification in JGJ / T 70-2009 "Standard for Test Methods of Basic Properties of Building Mortars". After the specimen was formed and demolded, it was placed in a curing room for 28 d. After taking it out and waiting for the surface to dry, it was loaded into a mortar permeameter for impermeability test. The test results are shown in Table 1.

[0089] Table 1

[0090]

[0091]

[0092]

[0093]

[0094] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects:

[0095] The diluent of the present invention ensures the low viscosity of the anti-CO 2 gas escape plugging agent during ground preparation, making the anti-CO 2 gas escape plugging agent have high fluidity, so that the anti-CO 2 gas escape plugging agent can be extruded into pores that traditional cement particles cannot reach, providing good injection performance for the anti-CO 2 gas escape plugging agent. After the anti-CO 2 gas escape plugging agent enters the formation fracture, with the increase of the formation temperature, acrylonitrile monomer undergoes bulk polymerization through the initiation of an initiator to form a long-chain polymer; the low pH environment formed after gas channeling of CO 2 in the fracture causes the C≡N bond in the cross-linked polyacrylonitrile to undergo acid hydrolysis to generate polyacrylic acid, and this polyacrylic acid undergoes a ring-opening reaction with the added epoxy resin to form a three-dimensional network structure polymer. This three-dimensional network structure polymer and cement interpenetrate each other, improving the overall adhesion, temperature resistance and compressive strength of the anti-CO 2 gas escape plugging agent. In addition, acrylonitrile contains a strong hydrophilic structure, which makes the anti-CO 2 gas escape plugging agent evenly mixed, reducing the cracking of the anti-CO 2 gas escape plugging agent, and having good toughness. Thus, the anti-CO 2 gas escape plugging composition obtained has the anti-CO 2 gas escape plugging agent with high strength, toughness, stability and acid resistance, and further realizes good plugging effect of gas channeling in CO 2 flooding wells.

[0096] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. 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 CO2 gas leakage blocking composition, characterized in that: In parts by weight, the anti-CO2 gas leakage blocking composition comprises: 90-100 parts of cement; 90-100 parts of epoxy resin; 15-20 parts of acrylonitrile; 25-35 parts of curing agent; 15 to 20 parts of diluent; and 0.01 to 0.1 parts of initiator.

2. The anti-CO2 gas leakage blocking composition according to claim 1, characterized in that: The mass ratio of the epoxy resin to the acrylonitrile is 5 to 6:

1.

3. The anti-CO2 gas leakage blocking composition according to claim 1 or 2, characterized in that: The mass ratio of the epoxy resin to the diluent is 4.5-5.5:

1.

4. The anti-CO2 gas leakage blocking composition according to any one of claims 1 to 3, characterized in that: The anti-CO2 gas escape plugging composition also includes 1 to 5 parts of a coupling agent.

5. The anti-CO2 gas leakage blocking composition according to claim 4, characterized in that: The coupling agent is selected from any one or more of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, vinyltriethoxysilane, and γ-aminopropyltriethoxysilane.

6. The anti-CO2 gas leakage blocking composition according to any one of claims 1 to 5, characterized in that: The epoxy resin is selected from any one or more of water-based epoxy resin, glue-curing epoxy resin, and solvent-based epoxy resin; preferably, the water-based epoxy resin is selected from any one or more of E-44, E-52, and E-58; preferably, the glue-curing epoxy resin is selected from any one or more of EP-301, Epoxy510, and EP-616; preferably, the solvent-based epoxy resin is selected from any one or more of NPSN-301X75, YN2301X75, and BE-188.

7. The anti-CO2 gas leakage blocking composition according to any one of claims 1 to 6, characterized in that: The curing agent is selected from any one or more of ethylenediamine, polyamide, and meta-phenylenediamine.

8. The anti-CO2 gas leakage blocking composition according to any one of claims 1 to 7, characterized in that: The diluent is selected from any one or more of ethanol, acetone and benzene.

9. The anti-CO2 gas leakage blocking composition according to any one of claims 1 to 8, characterized in that: The initiator is selected from any one or more of azobisisobutyronitrile, benzoyl peroxide, and ammonium persulfate.

10. A CO2 gas escape blocking agent, prepared by mixing a blocking composition, characterized in that: The plugging composition is the anti-CO2 gas escape plugging composition according to any one of claims 1 to 9.

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